JP7535595B2 - Optical materials, lenses and eyewear - Google Patents

Description

The present disclosure relates to optical materials, lenses and eyewear.

Plastic lenses are lighter and less likely to break than inorganic lenses, and so in recent years they have rapidly become popular as optical materials for eyeglass lenses, camera lenses, etc. One widely known example of an optical material is one that contains a polymer and an organic dye.

For example, Patent Document 1 discloses an organic glass material containing a specific wavelength absorbing dye, such as a tetraazaporphyrin metal complex compound having an absorption peak wavelength of 595 nm or 760 nm, and an ultraviolet absorber.

Patent Document 1: JP 2013-238634 A

Patent document 1 does not specify the color difference between red and green of the optical material, and it may be difficult to clearly recognize the red and green colors of an object when viewing the object through the optical material.

One embodiment of the present disclosure has been made in consideration of the above, and aims to provide an optical material that enables clear recognition of red and green colors of an object, and lenses and eyewear that include the optical material.

Means for solving the above problems include the following aspects.
<1> An optical material containing one or more dyes, in a spectrum measured in accordance with CIE1976, (A) a maximum absorption wavelength a is in the range of 560 nm to 610 nm, and a color difference parameter ΔC*R-G of the CIE1976 (L*, a*, b*) color system calculated using the following formulas (1) and (2) using a _D65 light source is 0 or more and 10 or less.
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE*=(ΔL* ² +Δa* ² +Δb* ² ) ^1/2 ...(2)
(In formula (1), ΔE* _R−G represents the color difference between red and green of the optical material obtained using formula (2), and ΔE* _R−G (w0) is a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, the mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and the molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86, and is determined by using the formula (2) above with a D65 light source.)
<2> The optical material according to <1>, further comprising (B) a maximum absorption wavelength b in the range of 400 nm to 520 nm in a spectrum measured in accordance with CIE1976.
<3> The optical material according to <2>, wherein a ratio of an integral value of a peak at the maximum absorption wavelength b to an integral value of a peak at the maximum absorption wavelength a is 1.00 to 2.50.
<4> The optical material according to <2> or <3>, wherein the difference between the maximum absorption wavelength a and the maximum absorption wavelength b is 130 nm to 200 nm.
<5> The optical material according to any one of <1> to <4>, wherein the half width of the absorption peak at the maximum absorption wavelength a is 10 nm to 70 nm.
<6> A first dye having a maximum absorption wavelength in the range of 560 nm to 610 nm,
The optical material according to any one of <1> to <5>, wherein the first dye contains a tetraazaporphyrin-based metal complex compound.
<7> The optical material according to any one of <1> to <6>, wherein when the optical material has a thickness of 2 mm, the blue light absorptance in the range of 380 nm to 500 nm in a spectrum measured in accordance with EN ISO12312-1:2013 is 15% to 50%.
<8> The optical material according to any one of <1> to <7>, wherein (a* ² +b* ² ) ^1/2 is 10 or less in the CIE1976 (L*, a*, b*) color system.
<9> The optical material according to any one of <1> to <8>, wherein a color difference parameter ΔC* _R−B of the CIE1976 (L*, a*, b*) color system calculated from the above formula (2) and the following formula (3) by using a D65 light source is 0 or more and 7 or less.
ΔC* _RB = ΔE* _RB -ΔE* _RB (w0)...(3)
(In formula (3), ΔE* _R−B represents the color difference between red and blue of the optical material obtained using formula (2), and ΔE* _R−B (w0) is a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, the mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and the molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86, and the color difference between red and blue determined using the formula (2) by using a D65 light source.)
<10> The optical material according to any one of <1> to <9>, further comprising at least one polymer selected from the group consisting of polyurethane, polythiourethane, polysulfide, polycarbonate, and poly(meth)acrylate.
<11> A lens comprising the optical material according to any one of <1> to <10>.
<12> The lens according to <11>, which is used as a spectacle lens.
<13> Eyewear that may include at least two optical members: an objective-side optical member and an eye-side optical member that faces the objective-side optical member,
In a spectrum measured in accordance with CIE1976 between the outermost surface of the objective-side optical member on the objective side and the outermost surface of the eye-side optical member on the eye side,
(A) the maximum absorption wavelength a is within the range of 560 nm to 610 nm,
(B) the maximum absorption wavelength b is within the range of 400 nm to 520 nm;
The eyewear, wherein a ratio of an integral value of the peak at the maximum absorption wavelength b to an integral value of the peak at the maximum absorption wavelength a is 1.00 to 2.50.

According to one embodiment of the present disclosure, it is possible to provide an optical material capable of clearly recognizing the red and green colors of an object, and lenses and eyewear including the optical material.

1 is a graph showing transmittance curves for the lenses of Examples 1 to 8. 1 is a graph showing transmittance curves for the lenses of Examples 9 to 15. 1 is a graph showing transmittance curves for the lenses of Examples 16 to 23. 1 is a graph showing transmittance curves for the lenses of Comparative Examples 1 to 6. 1 is a graph showing transmittance curves for the eyeglass lenses of Examples 201 to 206. 1 is a graph showing transmittance curves for the eyeglass lenses of Comparative Examples 201 and 202.

The contents of the present disclosure will be described in detail below.
The following description of the configuration elements may be based on representative embodiments of the present disclosure, but the present disclosure is not limited to such embodiments.

In the present disclosure, the use of "to" indicating a range of numerical values means that the numerical values before and after it are included as the lower limit and upper limit.
In the numerical ranges described in the present disclosure, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in the present disclosure. In addition, in the numerical ranges described in the present disclosure, the upper or lower limit value of the numerical range may be replaced with a value shown in the examples.

In the present disclosure, compounds that are not specified as being substituted or unsubstituted may have any substituent as long as the effects of the present disclosure are not impaired.
In the present disclosure, when a plurality of substances corresponding to each component are present in a layer, the amount of each component in the composition means the total amount of the plurality of substances present in the composition, unless otherwise specified.
In the present disclosure, combinations of preferred aspects are more preferred aspects.
In this disclosure, ppm (parts per million) means ppm by mass.

The present disclosure includes a first embodiment and a second embodiment.
The first and second embodiments will be described in detail below.

First Embodiment
<Optical materials>
The optical material of the first embodiment contains one or more dyes, and in a spectrum measured in accordance with CIE1976, (A) a maximum absorption wavelength a is present in the range of 560 nm to 610 nm, and a color difference parameter ΔC* _{R-G of the CIE1976 (L*, a*, b*) color system calculated from the following formulas (1) and (2} ) using a D65 light source is 0 or more and 10 or less.
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE*=(ΔL* ² +Δa* ² +Δb* ² ) ^1/2 ...(2)
(In formula (1), ΔE* _R−G represents the color difference between red and green of the optical material obtained using formula (2), and ΔE* _R−G (w0) is a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, the mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and the molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86, and is determined by using the formula (2) above with a D65 light source.)

When viewing an object through the optical material of the first embodiment, the red and green colors of the object can be clearly recognized. The reason for this is presumed to be as follows. First, since the maximum absorption wavelength a is present within the range of 560 nm to 610 nm, light whose wavelength region is between red light and green light is easily absorbed by the optical material. As a result, the transmittance of light whose wavelength region is between red light and green light in the optical material is reduced, and the red and green colors of the object can be clearly recognized. In the optical material of the first embodiment, since ΔC* _R-G is 0 or more, the color difference between red and green is larger than a certain amount compared to the comparative optical material, so that the red and green colors of the object can be more clearly recognized, and since ΔC* _R-G is 10 or less, the color difference between red and green is not too large, and as a result, the brightness is not lost when viewing an object through the optical material, and the red and green colors can be clearly recognized.

From the viewpoint of making it easier to more clearly recognize the red and green colors of an object, the color difference parameter ΔC* _R-G of the CIE1976 (L*, a*, b*) color system is preferably 2 or more and 10 or less, more preferably 3 or more and 9 or less, even more preferably 3.5 or more and 9 or less, particularly preferably 3.7 or more and 8.5 or less, and even more preferably 4 or more and 8 or less.

In the optical material of the first embodiment, it is preferable that the color difference parameter ΔC*R−B of the CIE1976 (L*, a*, b*) color system calculated from the above formula (2) and the following formula (3) by using a _D65 light source is 0 or more and 7 or less.
ΔC* _RB = ΔE* _RB -ΔE* _RB (w0)...(3)
(In formula (3), ΔE* _R−B represents the color difference between red and blue of the optical material obtained using formula (2), and ΔE* _R−B (w0) is a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, the mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and the molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86, and the color difference between red and blue determined using the formula (2) by using a D65 light source.)

In the optical material of the first embodiment, the color difference parameter ΔC* _R-B of the CIE1976 (L*, a*, b*) color system is equal to or greater than 0 and equal to or less than 7, so that when the object is viewed through the optical material, the red and blue colors of the object can be clearly recognized.

The color difference parameter ΔC* _R−B of the CIE1976 (L*, a*, b*) color system is preferably 0.5 or more and 7 or less, and more preferably 1 or more and 6 or less, from the viewpoint of making it easier to recognize red and blue colors of an object more clearly.

ΔC* _RG and ΔC* _RB can be measured by the method described in the Examples below.

In the optical material of the first embodiment, the aforementioned ΔC*R-G and ΔC*R-B can be adjusted by appropriately adjusting, for example, the type, amount, combination, etc. of pigments contained in the optical material, the type, amount, combination, etc. of additives such as ultraviolet absorbers that are contained in the optical material as necessary, and the type, _amount , combination, etc. of polymers _that are contained in the optical material as necessary.

The thickness of the optical material of the first embodiment is not particularly limited, and may be, for example, 0.5 mm to 10 mm, 1 mm to 5 mm, or 1.5 mm to 3 mm. As an example, the thickness of the optical material of the first embodiment may be 2 mm.
In the first embodiment, the thickness of the optical material means the maximum thickness.

In the optical material of the first embodiment, the maximum absorption wavelength a is in the range of 560 nm to 610 nm, preferably in the range of 570 nm to 600 nm, and more preferably in the range of 570 nm to 590 nm. In particular, when the maximum absorption wavelength a is in the range of 570 nm to 600 nm, absorption of light between red light and green light required for visual recognition of an object tends to be suppressed.
In the optical material of the first embodiment, there may be only one maximum absorption wavelength a within the range of 560 nm to 610 nm, or there may be two or more maximum absorption wavelengths a.

In the optical material of the first embodiment, the half width of the absorption peak of the maximum absorption wavelength a is preferably 10 nm to 70 nm, more preferably 15 nm to 50 nm, and further preferably 20 nm to 40 nm.
When the half-width is 10 nm or more, light between red light and green light tends to be absorbed in a wide wavelength range, and when the half-width is 100 nm or less, absorption of light between red light and green light, which is necessary for viewing an object, tends to be suppressed.

In this disclosure, the half-width refers to the full width at half maximum, and is expressed as the distance (nm) between the two intersections formed by the absorption peak and a straight line parallel to the horizontal axis drawn at 1/2 the extinction coefficient value (εg) at the maximum absorption wavelength in the absorption spectrum.

In the optical material of the first embodiment, it is preferable that, in the spectrum measured in accordance with CIE1976, (B) a maximum absorption wavelength b is present in the range of 400 nm to 520 nm.
As a result, the optical material of the first embodiment has a natural color tone with suppressed blue color.
In the eyeglass lens of the present disclosure, there may be only one maximum absorption wavelength b within the range of 400 nm to 520 nm, or there may be two or more maximum absorption wavelengths b.
From the above viewpoint, the maximum absorption wavelength b is preferably within the range of 430 nm to 490 nm, and more preferably within the range of 440 nm to 480 nm.

The transmittance at the maximum absorption wavelength b is preferably 3% to 60%, more preferably 10% to 55%, and even more preferably 15% to 50%.

The half width of the peak of the maximum absorption wavelength b is preferably 20 nm to 100 nm, more preferably 30 nm to 90 nm, and further preferably 40 nm to 80 nm.
When the half-width of the peak of the maximum absorption wavelength b is 20 nm or more, light in the complementary color region of 560 nm to 610 nm can be effectively absorbed.
By setting the half-width of the peak of the maximum absorption wavelength b to 100 nm or less, it is possible to suppress a decrease in visibility of an object caused by the absorption of light other than the light in the complementary color region.

It is also preferable that the transmittance at the maximum absorption wavelength b is 3% to 60%, and the half-width of the peak at the maximum absorption wavelength b is 20 nm to 100 nm.

In the optical material of the first embodiment, from the viewpoint of making the maximum absorption wavelength b a wavelength in the complementary color region of the maximum absorption wavelength a, the difference between the maximum absorption wavelength a and the maximum absorption wavelength b is preferably 100 nm or more, and more preferably 130 nm or more.
In the optical material of the first embodiment, from the viewpoint of setting the maximum absorption wavelength b to be a wavelength in a complementary color region of the maximum absorption wavelength a, the difference between the maximum absorption wavelength a and the maximum absorption wavelength b is preferably 200 nm or less, more preferably 180 nm or less, and further preferably 160 nm or less.

The optical material of the first embodiment may, for example, have a difference between the maximum absorption wavelength a and the maximum absorption wavelength b of 130 nm to 200 nm.

In the optical material of the first embodiment, in the CIE1976 (L*, a*, b*) color system, (a* ² + b* ² ) ^1/2 is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less.
In the optical material of the first embodiment, in the CIE1976 (L*, a*, b*) color system, b* is preferably −10 to +10, more preferably −9 to +9, and even more preferably −8 to +8.

In the optical material of the first embodiment, the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a is preferably 1.00 to 2.50.
This makes it possible to obtain an optical material that has a good balance between having a natural color tone with suppressed blue color and being able to clearly recognize red and green colors of an object.
From the above viewpoints, the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a is more preferably 1.10 to 2.20, even more preferably 1.20 to 2.00, and particularly preferably 1.30 to 1.80.

The integral value of the absorptance from 560 nm to 610 nm may be from 1800% to 2800%, and is preferably from 2000% to 2500%.
The integrated value of the absorptance from 400 nm to 520 nm may be from 2800% to 4800%, and preferably is from 3000% to 4500%.

(First dye)
The optical material of the first embodiment preferably contains a first dye having a maximum absorption wavelength in the range of 560 nm to 610 nm. The first dye may be of one type alone or of two or more types.

The first dye preferably contains a tetraazaporphyrin-based metal complex compound. The tetraazaporphyrin-based metal complex compound is not particularly limited as long as it is a metal complex compound having a tetraazaporphyrin skeleton and a metal atom, and is preferably, for example, a compound represented by the following general formula (1):

In general formula (1), A ₁ to A ₈ each independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonic acid group, a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, a linear, branched or cyclic alkenyl group having 2 to 20 carbon atoms, a linear, branched or cyclic alkynyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group, an alkylthio group having 6 to 20 carbon atoms, or an arylthio group having 6 to 20 carbon atoms. _A1 and _A2 , _A3 and _A4 , _A5 and _A6 , and _A7 and _A8 may each independently form a ring other than an aromatic ring. M represents a divalent metal atom, a trivalent substituted metal atom, a tetravalent substituted metal atom, a metal hydroxide atom, or a metal oxide atom.

Examples of the halogen atom in A ₁ to A ₈ include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, with a fluorine atom, a chlorine atom, or a bromine atom being preferred, and a fluorine atom or a bromine atom being more preferred.

Examples of the linear, branched or cyclic alkyl group having 1 to 20 carbon atoms for A ₁ to A ₈ include:
Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a 1,2-dimethylpropyl group, a 1-methylbutyl group, a 2-methylbutyl group, an n-hexyl group, a 2-methylpentyl group, a 4-methylpentyl group, a 4-methyl-2-pentyl group, a 1,2-dimethylbutyl group, a 2,3-dimethylbutyl group, a 2-ethylbutyl group, an n-heptyl group, a 3-methylhexyl group, a 5-methylhexyl group, a 2,4-dimethylpentyl group, an n-octyl group, a tert-octyl group, a 2-ethylhexyl group, a 2-propylpentyl group, a 2,5-dimethylhexyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a norbornyl group, and an isobornyl group.

Examples of the linear, branched or cyclic alkenyl group in A ₁ to A ₈ include a vinyl group, a 1-methylvinyl group, a propenyl group, a 2-butenyl group, and a 2-pentenyl group.

Examples of the straight-chain, branched or cyclic alkynyl group in A ₁ to A ₈ include an ethynyl group, a propynyl group, a butynyl group, a 1,3-butadiynyl group, a 2-pentynyl group, a 2,4-pentadiynyl group, a 2-hexynyl group, a 3,3-dimethyl-1-butynyl group, a 3-heptynyl group and a 4-octynyl group.

In general formula (1), M is preferably a divalent metal atom, and more preferably divalent copper. A specific example of a tetraazaporphyrin metal complex compound is tetra-t-butyl-tetraazaporphyrin copper complex represented by the following formula (1a). A commercially available product of tetra-t-butyl-tetraazaporphyrin copper complex is PD-311S (manufactured by Yamamoto Chemical Industry Co., Ltd.).

In formula (1a), Cu represents divalent copper, tC ₄ H ₉ represents a tertiary butyl group, and one of A ₁ and A ₂ , one of A ₃ and A ₄ , one of A ₅ and A ₆ , and one of A ₇ and A ₈ are tC ₄ H ₉ .

When the optical material of the first embodiment contains a first dye, the content of the first dye is preferably 5 ppm to 18 ppm, and more preferably 8 ppm to 15 ppm. Here, the first dye may be read as a tetraazaporphyrin metal complex compound.

The optical material of the first embodiment preferably satisfies at least one of the following (a) and (b), and more preferably satisfies both of the following (a) and (b).
(a) It has one or more maximum absorption wavelengths within the range of 400 nm or more and less than 500 nm.
(b) When the optical material has a thickness of 2 mm, the light transmittance at wavelengths of 380 nm or less is 20% or less.

When the optical material satisfies the above (a), it is possible to reduce the amount of stimulation of photoreceptor cells that are photoresponsive to green light, making it possible to recognize red more clearly. Furthermore, it has excellent blue light absorption rate, and can suppress adverse effects such as eye strain even when viewing a screen of a personal computer or the like for a long period of time through the optical material of the first embodiment. When the optical material satisfies the above (b), it is possible to suppress the transmission of ultraviolet light.

With regard to (a) above, it is preferable that the composition has one or more maximum absorption wavelengths within the range of 420 nm to 495 nm, and it is more preferable that the composition has one or more maximum absorption wavelengths within the range of 440 nm to 490 nm.

Regarding (b) above, when the thickness of the optical material is 2 mm, the light transmittance at wavelengths of 380 nm or less is preferably 10% or less, more preferably 5% or less. Moreover, the above-mentioned "380 nm or less" is preferably read as "400 nm or less", and more preferably as "420 nm or less".
In the first embodiment, the light transmittance may be measured using an optical material having a thickness other than 2 mm, and the measured value may be converted to the light transmittance of the optical material having a thickness of 2 mm.

Regarding (b) above, when the thickness of the optical material is 2 mm, the light transmittance at wavelengths of 280 nm or more may be 20% or less, 10% or less, or 5% or less.

When the optical material of the first embodiment has a thickness of 2 mm, the blue light absorptance from 380 nm to 500 nm in the spectrum measured in accordance with EN ISO12312-1:2013 is preferably 15% to 50%, more preferably 20% to 50%, and even more preferably 30% to 50%. A blue light absorptance of 15% or more tends to effectively cut blue light and suppress adverse effects such as eye strain. A blue light absorptance of 50% or less maintains blue visibility without excessively decreasing luminous transmittance, suppressing darkening of the field of view.

The optical material of the first embodiment preferably contains at least one of a porphyrin-based compound and a merocyanine-based compound, and more preferably contains a porphyrin-based compound. By containing a porphyrin-based compound, a merocyanine-based compound, or the like, the optical material suitably absorbs light having a wavelength in the range of 400 nm or more and less than 500 nm. The porphyrin-based compound, the merocyanine-based compound, or the like may be used independently, either alone or in combination of two or more.
The porphyrin-based compound can be the second dye contained in the optical material of the first embodiment.

(Second Dye)
The spectacle lens of the present disclosure preferably contains a second dye having a maximum absorption wavelength in the range of 400 nm to 520 nm. The second dye may be of one type alone or of two or more types.

The second dye preferably contains at least one of a porphyrin compound and a merocyanine compound, and more preferably contains a porphyrin compound.
The second dye contains a porphyrin compound, a merocyanine compound, or the like, and thus preferably absorbs light having a wavelength in the range of 400 nm or more and less than 500 nm.

The porphyrin compound preferably includes a compound represented by the following general formula (2):

In general formula (2), X ₁ to X ₈ each independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonic acid group, a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, a linear, branched or cyclic alkenyl group having 2 to 20 carbon atoms, a linear, branched or cyclic alkynyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group, an alkylthio group having 6 to 20 carbon atoms, or an arylthio group having 6 to 20 carbon atoms. R ₁ to R ₄ each independently represent a hydrogen atom or a linear or branched alkyl group, and M represents two hydrogen atoms, a divalent metal atom, a trivalent substituted metal atom, a tetravalent substituted metal atom, a metal hydroxide atom, or a metal oxide atom.
At least one of X ₁ to X ₈ is preferably other than a hydrogen atom, and is preferably a halogen atom, a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, a linear, branched or cyclic alkenyl group having 2 to 20 carbon atoms, or a linear, branched or cyclic alkynyl group having 2 to 20 carbon atoms.

Examples of the halogen atom in X ₁ to X ₈ include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, with a fluorine atom, a chlorine atom, or a bromine atom being preferred, and a fluorine atom or a bromine atom being more preferred.

It is preferable that R ₁ to R ₄ each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 8 carbon atoms.

M is preferably Cu, Zn, Fe, Co, Ni, Pt, Pd, Mn, Mg, Mn(OH), Mn(OH) ₂ , VO, or TiO, and more preferably Ni, Pd, or VO.

The preferred structures _{of the} linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, the linear, branched or cyclic alkenyl group having 2 to 20 carbon atoms, and the linear, branched or cyclic alkynyl group having 2 to 20 carbon atoms in X 1 to X 8 are the same as those of A ₁ to A ₈ in the above-mentioned general formula (1).

Examples of the linear or branched alkyl group having 1 to 8 carbon atoms for R ₁ to R ₄ include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a 1,2-dimethylpropyl group, a 1-methylbutyl group, a 2-methylbutyl group, an n-hexyl group, a 2-methylpentyl group, a 4-methylpentyl group, a 4-methyl-2-pentyl group, a 1,2-dimethylbutyl group, a 2,3-dimethylbutyl group, a 2-ethylbutyl group, an n-heptyl group, a 3-methylhexyl group, a 5-methylhexyl group, a 2,4-dimethylpentyl group, an n-octyl group, a tert-octyl group, a 2-ethylhexyl group, a 2-propylpentyl group, and a 2,5-dimethylhexyl group.

Among these, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, 1,2-dimethylpropyl, 1-methylbutyl, n-hexyl, 1,2-dimethylbutyl, 2-ethylbutyl, n-heptyl, n-octyl, or 2-ethylhexyl is preferred, and methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, n-hexyl, 1,2-dimethylbutyl, 2-ethylbutyl, n-heptyl, or n-octyl is more preferred.

The porphyrin-based compound that can be used in the optical material of the first embodiment can be produced by referring to a method known per se, for example, the method described in Octabromotetraphenylporphyrin and Its Metal Derivatives (Inorg. Chem. 1991, 30, 239-245).
The compound represented by the general formula (2) can be produced, for example, by using a pyrrole compound and an aldehyde compound, synthesizing the compound by a Rosemund reaction, which involves a dehydration condensation reaction with an acid catalyst and an oxidation reaction with an oxidizing agent, and then reacting the compound with a metal or a metal salt (e.g., an acetylacetone complex, a metal acetate) in a solvent. Examples of the pyrrole compound include the compounds represented by the general formulae (B-1) to (B-4), and examples of the aldehyde compound include the compounds represented by the general formulae (C-1) to (C-4). Examples of the acid catalyst include propionic acid, boron trifluoride-ethyl ether complex, trifluoroacetic acid, and the like, and examples of the oxidizing agent include 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, and the like.

X ₁ to X ₈ and R ₁ to R ₄ in general formulae (B-1) to (B-4) and general formulae (C-1) to (C-4) are the same as X ₁ to X ₈ and R ₁ to R ₄ in general formula (2).

The compound represented by general formula (2) may be one type or a mixture of two or more isomers.

When the optical material of the first embodiment contains a porphyrin-based compound, the content of the porphyrin-based compound is preferably 1.5 ppm to 16 ppm, and more preferably 2 ppm to 12 ppm.
When the optical material of the first embodiment contains a merocyanine compound, the content of the merocyanine compound is preferably 1.5 ppm to 14 ppm, and more preferably 2 ppm to 12 ppm.

As the second dye, commercially available products such as UVY-0026 (manufactured by Yamamoto Chemical Industry Co., Ltd.), UVY-1023 (manufactured by Yamamoto Chemical Industry Co., Ltd.), FDB-001 (manufactured by Yamada Chemical Industry Co., Ltd.), and ABS 430 (manufactured by Luxottica) can be used.

(Polymer)
The optical material of the first embodiment preferably contains a polymer.
In the first embodiment, the polymer to be used may be a commercially available polymer, or a monomer or a polymer obtained from the monomer or the like.
In the first embodiment, the polymer that can be used is not particularly limited, and is preferably a transparent polymer.
The polymer and the monomer for obtaining the polymer will be described below.

The polymer is not particularly limited, and examples thereof include polyurethane, polythiourethane, polysulfide, polycarbonate, poly(meth)acrylate, polyolefin, cyclic polyolefin, polyallyl, polyurethane urea, polyene-polythiol polymer, ring-opening metathesis polymer, polyester, and epoxy resin.
The polymer may be used alone or in combination of two or more.

The optical material preferably contains at least one polymer selected from the group consisting of polyurethane, polythiourethane, polysulfide, polycarbonate, and poly(meth)acrylate, and more preferably contains polythiourethane. These polymers are highly transparent materials and can be suitably used for optical material applications.

Polyurethane contains structural units derived from polyisocyanate compounds and structural units derived from polyol compounds. Polythiourethane contains structural units derived from polyisocyanate compounds and structural units derived from polythiol compounds.

Polyisocyanate compounds include 1,6-hexamethylene diisocyanate, 1,5-pentamethylene diisocyanate, 2,2,4-trimethylhexane diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, lysine diisocyanatomethyl ester, lysine triisocyanate, m-xylylene diisocyanate, α,α,α',α'-tetramethylxylylene diisocyanate, bis(isocyanatomethyl)naphthalene, mesitylene triisocyanate, bis(isocyanatomethyl)sulfide, bis(isocyanatoethyl)sulfide, bis(isocyanatomethyl)disulfide, bis(isocyanatoethyl)disulfide, bis(iso aliphatic polyisocyanate compounds such as bis(isocyanatomethylthio)methane, bis(isocyanatoethylthio)methane, bis(isocyanatoethylthio)ethane, and bis(isocyanatomethylthio)ethane; isophorone diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane, dicyclohexylmethane diisocyanate, cyclohexane diisocyanate, methylcyclohexane diisocyanate, dicyclohexyldimethylmethane isocyanate, 2,5-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 2,6-bis(isocyanatomethyl)bicyclo-[2.2.1]-heptane, 3,8- Alicyclic polyisocyanate compounds such as bis(isocyanatomethyl)tricyclodecane, 3,9-bis(isocyanatomethyl)tricyclodecane, 4,8-bis(isocyanatomethyl)tricyclodecane, and 4,9-bis(isocyanatomethyl)tricyclodecane; naphthalene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, biphenyl diisocyanate, diphenylmethane-2,2'-diisocyanate, diphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, benzene triisocyanate, and diphenyl sulfide. and aromatic polyisocyanate compounds such as 2,5-diisocyanatothiophene, 2,5-bis(isocyanatomethyl)thiophene, 2,5-diisocyanatotetrahydrothiophene, 2,5-bis(isocyanatomethyl)tetrahydrothiophene, 3,4-bis(isocyanatomethyl)tetrahydrothiophene, 2,5-diisocyanato-1,4-dithiane, 2,5-bis(isocyanatomethyl)-1,4-dithiane, 4,5-diisocyanato-1,3-dithiolane, and 4,5-bis(isocyanatomethyl)-1,3-dithiolane. At least one selected from these can be used.

The polyol compound is one or more aliphatic or alicyclic alcohols, and specific examples thereof include straight-chain or branched-chain aliphatic alcohols, alicyclic alcohols, and alcohols obtained by adding these alcohols to ethylene oxide, propylene oxide, or ε-caprolactone, and at least one selected from these can be used.

Examples of linear or branched aliphatic alcohols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 3-methyl-1,3-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1,5-pentanediol, 2,4-pentanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, glycerol, diglycerol, polyglycerol, trimethylolpropane, pentaerythritol, and di(trimethylolpropane).

Examples of alicyclic alcohols include 1,2-cyclopentanediol, 1,3-cyclopentanediol, 3-methyl-1,2-cyclopentanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 4,4'-bicyclohexanol, 1,4-cyclohexanedimethanol, etc., and at least one selected from these can be used.

Compounds obtained by adding these alcohols to ethylene oxide, propylene oxide, or ε-caprolactone may also be used. For example, ethylene oxide adduct of glycerol, ethylene oxide adduct of trimethylolpropane, ethylene oxide adduct of pentaerythritol, propylene oxide adduct of glycerol, propylene oxide adduct of trimethylolpropane, propylene oxide adduct of pentaerythritol, caprolactone-modified glycerol, caprolactone-modified trimethylolpropane, caprolactone-modified pentaerythritol, etc. may be mentioned, and at least one selected from these may be used.

Polythiol compounds include methanedithiol, 1,2-ethanedithiol, 1,2,3-propanetrithiol, 1,2-cyclohexanedithiol, bis(2-mercaptoethyl)ether, tetrakis(mercaptomethyl)methane, diethylene glycol bis(2-mercaptoacetate), diethylene glycol bis(3-mercaptopropionate), ethylene glycol bis(2-mercaptoacetate), ethylene glycol bis(3-mercaptopropionate), trimethylolpropane tris(2-mercaptoacetate), trimethylolpropane tris(3-mercaptopropionate), pionate), trimethylolethane tris(2-mercaptoacetate), trimethylolethane tris(3-mercaptopropionate), pentaerythritol tetrakis(2-mercaptoacetate), pentaerythritol tetrakis(3-mercaptopropionate), bis(mercaptomethyl)sulfide, bis(mercaptomethyl)disulfide, bis(mercaptoethyl)sulfide, bis(mercaptoethyl)disulfide, bis(mercaptopropyl)sulfide, bis(mercaptomethylthio)methane, bis(2-mercaptoethylthio)methane, bis(3-mercaptopropyl 1,2-bis(mercaptomethylthio)methane, 1,2-bis(2-mercaptoethylthio)ethane, 1,2-bis(3-mercaptopropylthio)ethane, 1,2,3-tris(mercaptomethylthio)propane, 1,2,3-tris(2-mercaptoethylthio)propane, 1,2,3-tris(3-mercaptopropylthio)propane, 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, undecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, tetrakis(mercaptomethylthiomethyl)methane, tetrakis(2-mercaptoethylthiomethyl)methane, tetrakis(3-mercaptopropylthiomethyl)methane, bis(2,3-dimercaptopropyl)sulfide, 2,5-dimercaptomethyl-1,4-dithiane, 2,5-dimercapto-1,4-dithiane, 2,5-dimercaptomethyl-2,5-dimethyl-1,4-dithiane, and their thioglycolic acid and mercaptopropionic acid esters, hydroxymethylsulfide bis ...methyl-2,5-dimethyl-1,4-dithiane, and their thioglycolic acid and mercaptopropionic acid esters, hydroxymethylsulfide bis(mercaptomethylthiomethyl)methane, tetrakis(2-mercaptoethylthio bis(2-mercaptoacetate), hydroxymethyl sulfide bis(3-mercaptopropionate), hydroxyethyl sulfide bis(2-mercaptoacetate), hydroxyethyl sulfide bis(3-mercaptopropionate), hydroxymethyl disulfide bis(2-mercaptoacetate), hydroxymethyl disulfide bis(3-mercaptopropionate), hydroxyethyl disulfide bis(2-mercaptoacetate), hydroxyethyl disulfide bis(3-mercaptopropionate), 2-mercaptoethyl ether bis(2-mercaptoacetate), 2-mercaptoethyl Aliphatic compounds such as mercaptoethyl ether bis(3-mercaptopropionate), thiodiglycolic acid bis(2-mercaptoethyl ester), thiodipropionic acid bis(2-mercaptoethyl ester), dithiodiglycolic acid bis(2-mercaptoethyl ester), dithiodipropionic acid bis(2-mercaptoethyl ester), 1,1,3,3-tetrakis(mercaptomethylthio)propane, 1,1,2,2-tetrakis(mercaptomethylthio)ethane, 4,6-bis(mercaptomethylthio)-1,3-dithiane, tris(mercaptomethylthio)methane, and tris(mercaptoethylthio)methane. Polythiol compounds: 1,2-dimercaptobenzene, 1,3-dimercaptobenzene, 1,4-dimercaptobenzene, 1,2-bis(mercaptomethyl)benzene, 1,3-bis(mercaptomethyl)benzene, 1,4-bis(mercaptomethyl)benzene, 1,2-bis(mercaptoethyl)benzene, 1,3-bis(mercaptoethyl)benzene, 1,4-bis(mercaptoethyl)benzene, 1,3,5-trimercaptobenzene, 1,3,5-tris(mercaptomethyl)benzene, 1,3,5-tris(mercaptomethyleneoxy)benzene, 1,3,5-tris(mercaptoethyleneoxy)benzene, Examples of the aromatic polythiol compounds include benzene, 2,5-toluenedithiol, 3,4-toluenedithiol, 1,5-naphthalenedithiol, and 2,6-naphthalenedithiol; and heterocyclic polythiol compounds such as 2-methylamino-4,6-dithiol-sym-triazine, 3,4-thiophenedithiol, bismuthiol, 2,5-bis(mercaptomethyl)-1,4-dithiane, 4,6-bis(mercaptomethylthio)-1,3-dithiane, and 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithietane. At least one selected from these compounds can be used.

Polysulfides can be obtained by a method involving ring-opening polymerization of monomers such as polyepithio compounds and polythietane compounds. The optical material composition can contain monomers that constitute these polymers.

The polyepithio compound is not particularly limited and may be any compound described in Japanese Patent No. 6216383.
As the polythietane compound, a metal-containing thietane compound or a nonmetallic thietane compound can be used. Specifically, for example, the compounds described in Japanese Patent No. 6216383 can be used.

Polycarbonate can be obtained by reacting alcohol with phosgene, or by reacting alcohol with chloroformate, or by transesterification of a carbonate diester compound, but it is also possible to use commercially available polycarbonate resins. Commercially available products that can be used include the Panlite series manufactured by Teijin Chemical Co., Ltd. The composition for optical materials of the first embodiment can contain polycarbonate as a resin material.

There are no particular limitations on the poly(meth)acrylate that can be used; for example, those described in Japanese Patent Publication No. 6216383 can be used.

There are no particular limitations on the polyolefin that can be used; for example, specific examples described in Japanese Patent No. 6216383, cyclic polyolefins, olefin polymerization reactions, and methods for producing polyolefins can be used.

Polyallyl is produced by polymerizing at least one allyl group-containing monomer selected from allyl group-containing monomers in the presence of a known radical-generating polymerization catalyst.
As the allyl group-containing monomer, allyl diglycol carbonate and diallyl phthalate are generally commercially available and can be suitably used.

Polyurethane urea is a reaction product of polyurethane prepolymer and diamine curing agent, and a representative example is sold by PPG Industries, Inc. under the trademark TRIVEX. Polyurethane urea is a highly transparent material and can be used favorably.

Polyene-polythiol polymers are polymeric products produced by addition polymerization and ethylene chain polymerization of polyene compounds having two or more ethylenic functional groups per molecule and polythiol compounds having two or more thiol groups per molecule.

As the polyene compound in the polyene-polythiol polymer, for example, those described in Japanese Patent No. 6216383 can be used.

A ring-opening metathesis polymer is a polymer obtained by ring-opening polymerization of cyclic olefins using a catalyst. Examples of cyclic olefins that can be ring-opened and polymerized include those described in Japanese Patent No. 6216383.

Polyesters are condensation polymerized in the presence of known polyester production catalysts such as Lewis acid catalysts, organic acids, inorganic acids, etc., such as antimony and germanium compounds. Specifically, they are made of one or more selected from polyvalent carboxylic acids including dicarboxylic acids and their ester-forming derivatives, and one or more selected from polyhydric alcohols including glycols, or made of hydroxycarboxylic acids and their ester-forming derivatives, or made of cyclic esters.

As dicarboxylic acids and glycols, for example, those described in Patent Publication No. 6216383 can be used.

As polyester, for example, those described in Patent Publication No. 6216383 can be used.

Epoxy resins are polymers obtained by ring-opening polymerization of epoxy compounds, and examples of epoxy compounds that can be used include those described in Japanese Patent Publication No. 6216383.

(Additives)
The optical material of the first embodiment may contain additives as components other than those described above.
Examples of the additives include a polymerization catalyst, an internal mold release agent, a dye, an ultraviolet absorber, etc. In the first embodiment, when the polyurethane and the polythiourethane are obtained, a polymerization catalyst may or may not be used.
The internal mold release agent may be an acidic phosphate ester. Examples of the acidic phosphate ester include a monophosphate ester and a diphosphate ester, and each of these may be used alone or in combination of two or more kinds.

Examples of ultraviolet absorbers include benzophenone-based ultraviolet absorbers such as 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-acryloyloxybenzophenone, 2-hydroxy-4-acryloyloxy-5-tert-butylbenzophenone, and 2-hydroxy-4-acryloyloxy-2',4'-dichlorobenzophenone; 2-[4-[(2-hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine; 2-[4-(2-hydroxy-3-tolyloxypropyl)oxy]-2-hydroxyphenyl]4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine; 2-[4-[(2-hydroxy-3-(2'-ethyl)hexyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis(2-hydroxy-4-butyloxyphenyl)-6-(2,4-bis-butyloxyphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-[1-octyloxycarbonylethoxy]phenyl)-4,6-bis(4 triazine-based ultraviolet absorbers such as 2-(2H-benzotriazol-2-yl)-4-methylphenol, 2-(2H-benzotriazol-2-yl)-4-tert-octylphenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol, and 2-(5-chloro-2H-benzotriazol-2-yl)-4-methyl-6-tert-butylphenol. , 2-(5-chloro-2H-benzotriazol-2-yl)-2,4-tert-butylphenol, 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] and other benzotriazole-based ultraviolet absorbers, with preferred examples being 2-(2H-benzotriazol-2-yl)-4-tert-octylphenol and 2-(5-chloro-2H-benzotriazol-2-yl)-4-methyl-6-tert-butylphenol. These ultraviolet absorbers can be used alone or in combination of two or more.

The ultraviolet absorber may be a commercially available product. Examples of the commercially available product include Tinuvin 326 (manufactured by BASF Japan Ltd.) and Viosorb 583 (manufactured by Kyodo Pharmaceutical Co., Ltd.).

The optical material of the first embodiment may contain a color tone adjuster. When the optical material contains a color tone adjuster, the content of the color tone adjuster may be 3 ppm to 50 ppm, or 5 ppm to 40 ppm.

Examples of color tone adjusting agents include those that have an absorption band in the orange to yellow wavelength range of the visible light region and have the function of adjusting the hue of optical materials containing polymers. Examples of color tone adjusting agents include bluing agents. Examples of bluing agents include those that have an absorption band in the orange to yellow wavelength range of the visible light region and have the function of adjusting the hue of optical materials made of resin materials. The bluing agent may contain a substance that exhibits a blue to purple color.

(Luminous transmittance)
From the viewpoint of visibility, the optical material of the first embodiment preferably has a luminous transmittance of 65% or more, more preferably 68% or more, and even more preferably 70% or more.
The luminous transmittance can be measured using a spectrophotometer (eg, CM-5 manufactured by Konica Minolta) using an optical material having a thickness of 2 mm.

<Composition for optical materials>
The optical material can be produced, for example, by using a composition for optical materials described below.
The composition for optical materials contains (A) a first dye having a maximum absorption wavelength a in the range of 560 nm to 610 nm in a spectrum measured in accordance with CIE 1976, and when the composition for optical materials is cured, The optical material obtained by using the D65 light source has a color difference parameter ΔC* _R−G of the CIE1976 (L*, a*, b*) color system calculated from the above-mentioned formulas (1) and (2). It must be greater than or equal to 0 and less than or equal to 10.
The composition for optical materials may contain the above-mentioned polymer or the above-mentioned monomer, may contain the above-mentioned porphyrin compound which can be the second dye, and may contain additives such as an ultraviolet absorber. Good too.

The content of the dye is preferably 0.0001 to 0.008 parts by mass, more preferably 0.0001 to 0.006 parts by mass, and even more preferably 0.0002 to 0.004 parts by mass, per 100 parts by mass of the total of the polymer and the monomer.
The content of the dye means the total content of all the dyes contained in the composition for optical materials.

In the first embodiment, the composition for optical materials can be obtained by mixing the above-mentioned components by a predetermined method.
The mixing order and mixing method of each component in the composition are not particularly limited, and can be performed by a known method. For example, a known method includes a method of preparing a master batch containing a predetermined amount of additives, dispersing this master batch in a solvent, and dissolving it. For example, in the case of a polyurethane resin, a method of dispersing and dissolving an additive in a polyisocyanate compound to prepare a master batch is available.

<Embodiments of Optical Materials>
Examples of the optical material of the first embodiment include an optical material made of a substrate, and an optical material made of a substrate and a coating layer.
The substrate may be, for example, a lens substrate.

Examples of coating layers include a primer layer, a hard coat layer, an anti-reflection layer, an anti-fog coating layer, an anti-fouling layer, and a water-repellent layer. Each of these coating layers can be used alone or in a multi-layer configuration. When coating layers are applied to both sides, the same coating layer or different coating layers may be applied to each side.

For example, a molded body (e.g., a lens substrate) may be prepared using a composition for optical materials that does not contain a dye, and then the molded body may be immersed in a dispersion obtained by dispersing the dye in water or a solvent to impregnate the molded body with the dye, and the molded body impregnated with the dye may be dried. An optical material may be prepared using the molded body thus obtained.

In addition, after preparing the optical material, the porphyrin-based compound can be impregnated into the optical material. In addition, a spectacle lens having a lens substrate and a coating layer laminated as necessary can be immersed in a dispersion liquid containing the pigment to impregnate the lens with the pigment.

The amount of dye impregnation may be adjusted to a desired amount by adjusting the concentration of the dye in the dispersion, the temperature of the dispersion, and the time for immersing the molded body, optical material, etc. The amount of impregnation increases as the concentration, temperature, and immersion time increase. When the amount of impregnation is to be adjusted more precisely, the immersion may be repeated multiple times under conditions that result in a small amount of impregnation.
Furthermore, a composition for optical materials containing a dye may be used as a coating material to form a dye-containing coating layer on an optical material such as a plastic lens.

An optical material having such a structure can be suitably used as a lens, preferably as a spectacle lens.
The first embodiment is not limited to the above-described embodiment, and various modifications can be made without impairing the effects of the present invention.

<Applications of optical materials>
Uses of the optical material of the first embodiment include:
Lenses such as eyeglass lenses, goggles, eyeglass lenses for vision correction, lenses for imaging devices, Fresnel lenses for liquid crystal projectors, lenticular lenses, contact lenses, lenses for wearable devices, etc.;
Sealing materials for light-emitting diodes (LEDs); optical waveguides; optical lenses; optical adhesives used for bonding optical waveguides, etc.; anti-reflection films for optical lenses, etc.; transparent coatings for liquid crystal display device components (substrates, light guide plates, films, sheets, etc.); windshields for car windshields, motorcycle helmets, etc.; transparent substrates; covers for lighting fixtures, films to be attached to the illuminated surfaces of lighting fixtures, etc.;
etc. can be mentioned.
Among the above, the optical material of the first embodiment is preferably a lens since it can contain an ultraviolet absorbing agent.

(lens)
The lens of the first embodiment includes the optical material of the first embodiment described above. The lens of the first embodiment may be a lens having a lens substrate made of an optical material, and may have a coating layer on one or both sides of the lens substrate. The lens of the first embodiment may be any of the various lenses exemplified in the applications of the optical material described above.

Specific examples of coating layers include a primer layer, a hard coat layer, an anti-reflection layer, an anti-fogging coat layer, an anti-fouling layer, and a water-repellent layer. Each of these coating layers can be used alone or in a multi-layer configuration. When coating layers are applied to both sides, the same coating layer or different coating layers may be applied to each side.

These coating layers may contain the dye used in the first embodiment, an infrared absorbing agent, a light stabilizer, an antioxidant, etc., dyes, pigments, etc., photochromic dyes, photochromic pigments, etc., antistatic agents, and other known additives for improving the performance of the lens.
For layers that are coated by coating, various leveling agents may be used to improve coatability.

The primer layer is usually formed between the hard coat layer described below and the lens substrate. The primer layer is a coating layer intended to improve adhesion between the hard coat layer formed thereon and the lens substrate, and in some cases, it is also possible to improve impact resistance. The primer layer may be any layer that has high adhesion to the obtained lens substrate, and for example, a primer composition containing a urethane resin, an epoxy resin, a polyester resin, a melamine resin, or a polyvinyl acetal as a main component is used to form the primer layer. In preparing the primer composition, a solvent that does not affect the lens substrate may be used to adjust the viscosity of the composition, or no solvent may be used.

The primer layer can be formed by either a coating method or a dry method. When a coating method is used, the primer composition is applied to the lens substrate by a known coating method such as spin coating or dip coating, and then solidified to form the primer layer. When a dry method is used, the primer layer is formed by a known dry method such as a CVD method or a vacuum deposition method. When forming the primer layer, the surface of the lens substrate may be pretreated with an alkali treatment, a plasma treatment, an ultraviolet treatment, or the like, as necessary, in order to improve adhesion.

The hard coat layer is a coating layer intended to impart functions such as scratch resistance, abrasion resistance, moisture resistance, warm water resistance, heat resistance, weather resistance, etc. to the lens surface.
For the formation of the hard coat layer, a hard coat composition containing a curable organosilicon compound and at least one oxide fine particle containing an element selected from the group consisting of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In and Ti may be used;
A hard coat composition may be used that contains a curable organosilicon compound and one or more types of composite oxide fine particles containing two or more elements selected from the group consisting of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti.

In addition to the above components, the hard coat composition preferably contains at least one selected from the group consisting of amines, amino acids, metal acetylacetonate complexes, organic acid metal salts, perchloric acids, salts of perchloric acids, acids, metal chlorides, and polyfunctional epoxy compounds.
The hard coat composition may contain a solvent that does not affect the lens substrate, or may be solvent-free.

The hard coat layer is usually formed by applying a hard coat composition by a known application method such as spin coating or dip coating, followed by curing. Examples of the curing method include irradiation with energy rays such as ultraviolet rays or visible light, and thermal curing. From the viewpoint of suppressing the occurrence of interference fringes, it is preferable that the difference in refractive index between the hard coat layer and the lens substrate is within a range of ±0.1.

Anti-reflective layers include inorganic and organic types.
The inorganic anti-reflection layer is formed using an inorganic oxide such as SiO ₂ or TiO ₂ by a dry method such as vacuum deposition, sputtering, ion plating, ion beam assisted deposition, or CVD.
The organic anti-reflection layer is formed by a wet process using a composition containing an organosilicon compound and silica-based fine particles having internal cavities.
An anti-reflection layer may be formed on the hard coat layer, if necessary.

The anti-reflection layer may be a multi-layer or a single layer.
From the viewpoint of effectively exerting the antireflection function, the antireflection layer is preferably a multi-layer, in which case it is preferable that low-refractive index layers and high-refractive index layers are alternately laminated, and the difference in refractive index between the low-refractive index layers and the high-refractive index layers is preferably 0.1 or more.
Examples of high refractive index layers include layers of ZnO, _TiO2 , _CeO2 , _Sb2O5 , _SnO2 , _ZrO2 , _{Ta2O5 ,} etc., and examples of low refractive index layers include layers of _SiO2 , etc.
When used as a single layer, it is preferable that the refractive index is at least 0.1 or more lower than the refractive index of the hard coat layer.

An anti-fog coating layer, an anti-pollution layer, a water-repellent layer, etc. may be formed on the anti-reflection layer as necessary. The method for forming the anti-fog layer, the anti-pollution layer, the water-repellent layer, etc. is not particularly limited, and any conventionally known method can be applied.

(Wearable Devices)
The wearable device of the first embodiment includes a lens for use in the wearable device. The wearable device of the first embodiment may be, for example, a wearable device used in computer games or the like, or a wearable device that realizes virtual reality (VR), augmented reality (AR), or the like. The wearable device including the lens of the first embodiment is capable of clearly recognizing the red and green colors of an object even when used in computer games or the like in which images are processed at high speed, and is suitable for electronic competitions using computer games such as e-sports.

Eyewear
The eyewear of the first embodiment may include at least two optical members: an objective-side optical member and an eye-side optical member opposed to the objective-side optical member,
In a spectrum measured in accordance with CIE1976 between the outermost surface of the objective-side optical member on the objective side and the outermost surface of the eye-side optical member on the eye side,
(A) the maximum absorption wavelength a is within the range of 560 nm to 610 nm,
(B) the maximum absorption wavelength b is within the range of 400 nm to 520 nm;
The ratio of the integral value of the peak at the maximum absorption wavelength b to the integral value of the peak at the maximum absorption wavelength a is 1.00 to 2.50.

By including the above-mentioned configuration, the eyewear of the first embodiment has a natural color tone with suppressed blue, allowing the red and green colors of an object to be clearly recognized.

The optical material of the first embodiment can be used as an optical member in the eyewear of the first embodiment. Furthermore, a preferred aspect of the optical material of the first embodiment can be used as a preferred aspect of the optical member in the eyewear of the first embodiment.
For example, the range of color difference parameters of the CIE 1976 (L*, a*, b*) color system obtained from the above-mentioned formulas (1), (2), (3), etc. can also be applied to the optical components in the eyewear of the first embodiment.

The eyewear of the first embodiment may include at least two optical members: an objective-side optical member, and an eye-side optical member that faces the objective-side optical member.
There are no particular limitations on the eyewear of the first embodiment, so long as the spectrum measured in accordance with CIE1976 between the objective-side outermost surface of the objective-side optical member and the eye-side outermost surface of the eye-side optical member satisfies the above (A) and (B), and the ratio of the integral of the peak at maximum absorption wavelength b to the integral of the peak at maximum absorption wavelength a is 1.00 to 2.50.

Examples of eyewear that include at least two optical elements, an objective-side optical element and an eye-side optical element that faces the objective-side optical element, include clip-on type glasses and glasses with overglasses.

The eyewear of the first embodiment may include one optical member.
An example of eyewear that includes one optical member is a pair of glasses with tinted lenses.

Examples of optical components include lenses, filters, goggles, mirrors, helmet visors, LED (light emitting diode) screens, computer screens, windshields, etc.

Second Embodiment
<Eyeglass lenses>
The eyeglass lens of the second embodiment includes a functional layer, and in a spectrum measured in accordance with CIE 1976, the functional layer has (A) a maximum absorption wavelength a in the range of 560 nm to 610 nm, and (B) a maximum absorption wavelength b in the range of 400 nm to 520 nm, and the ratio of the integral of the peak of maximum absorption wavelength b to the integral of the peak of maximum absorption wavelength a is 1.00 to 2.50.

When viewing an object through the eyeglass lens of the second embodiment, the red and green colors of the object can be clearly recognized. The reason for this is presumed to be as follows. First, the maximum absorption wavelength is in the range of 560 nm to 610 nm, so that light whose wavelength range is between red light and green light is easily absorbed by the eyeglass lens. This reduces the transmittance of light whose wavelength range is between red light and green light through the eyeglass lens, making it easier to clearly recognize the red and green colors of the object.
Here, when light whose wavelength range is between red light and green light is easily absorbed by eyeglass lenses, that is, when the maximum absorption wavelength is in the range of 560 nm to 610 nm, the color of the lens may turn blue, resulting in an unnatural appearance.
Therefore, the inventors have investigated reducing the transmittance of light in the blue region (that is, wavelengths of 400 nm to 520 nm), which is a complementary color to colors between red and green light (eg, the yellow region).
The spectacle lens of the second embodiment can reduce the transmittance of light in the blue region by having the maximum absorption wavelength b in the range of 400 nm to 520 nm.
In the eyeglass lens of the second embodiment, the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a is 1.00 to 2.50.
As a result, the eyeglass lens of the second embodiment including the above configurations has a natural color tone with suppressed blue, and allows the red and green colors of an object to be clearly recognized.

<Functional layer>
The eyeglass lens of the second embodiment includes a functional layer, and in a spectrum measured in accordance with CIE 1976, the functional layer has (A) a maximum absorption wavelength a in the range of 560 nm to 610 nm, and (B) a maximum absorption wavelength b in the range of 400 nm to 520 nm, and the ratio of the integral of the peak of maximum absorption wavelength b to the integral of the peak of maximum absorption wavelength a is 1.00 to 2.50.
In the eyeglass lens of the second embodiment, there may be only one maximum absorption wavelength a within the range of 560 nm to 610 nm, or there may be two or more maximum absorption wavelengths a.
In the eyeglass lens of the second embodiment, there may be only one maximum absorption wavelength b within the range of 400 nm to 520 nm, or there may be two or more maximum absorption wavelengths b.

In the spectrum measured in accordance with CIE1976, the functional layer has a maximum absorption wavelength a in the range of (A) 560 nm to 610 nm.
This allows the red and green colors of the object to be clearly recognized.
From the above viewpoint, the maximum absorption wavelength a is preferably within the range of 570 nm to 600 nm, and more preferably within the range of 580 nm to 595 nm.

The transmittance at the maximum absorption wavelength a is preferably 5% to 50%, more preferably 10% to 40%, and even more preferably 20% to 40%.

The half width of the peak of the maximum absorption wavelength a is preferably 10 nm to 70 nm, more preferably 10 nm to 50 nm, and further preferably 20 nm to 40 nm.
When the half-width of the peak of the maximum absorption wavelength a is 10 nm or more, light between red light and green light tends to be absorbed in a wide wavelength range.
By setting the half-width of the peak of the maximum absorption wavelength a to 70 nm or less, there is a tendency for absorption of light between red light and green light, which is necessary for visual recognition of an object, to be suppressed.

In the second embodiment, the half-width refers to the full width at half maximum, and is expressed as the distance (nm) between the two intersections formed by the absorption peak and a straight line parallel to the horizontal axis drawn at 1/2 the extinction coefficient value (εg) at the maximum absorption wavelength in the absorption spectrum.

In the spectrum measured in accordance with CIE1976, the functional layer has a maximum absorption wavelength b in the range of (B) 400 nm to 520 nm.
As a result, the eyeglass lens of the second embodiment has a natural color tone with the blue color suppressed.
From the above viewpoint, the maximum absorption wavelength b is preferably within the range of 430 nm to 490 nm, and more preferably within the range of 440 nm to 480 nm.

The transmittance at the maximum absorption wavelength b is preferably 3% to 60%, more preferably 10% to 55%, and even more preferably 15% to 50%.

The half width of the peak of the maximum absorption wavelength b is preferably 20 nm to 100 nm, more preferably 30 nm to 90 nm, and further preferably 40 nm to 80 nm.
When the half-width of the peak of the maximum absorption wavelength b is 20 nm or more, light in the complementary color region of 560 nm to 610 nm can be effectively absorbed.
By setting the half-width of the peak of the maximum absorption wavelength b to 100 nm or less, it is possible to suppress a decrease in visibility of an object caused by the absorption of light other than the light in the complementary color region.

It is also preferable that the transmittance at the maximum absorption wavelength b is 3% to 60%, and the half-width of the peak at the maximum absorption wavelength b is 20 nm to 100 nm.

From the viewpoint of making the maximum absorption wavelength b a wavelength in the complementary color region of the maximum absorption wavelength a, the difference between the maximum absorption wavelength a and the maximum absorption wavelength b of the functional layer is preferably 100 nm to 200 nm, more preferably 100 nm to 180 nm, and even more preferably 100 nm to 160 nm.

In the eyeglass lens of the second embodiment, in the CIE 1976 (L*, a*, b*) color system, (a* ² + b* ² ) ^1/2 is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less.
In the eyeglass lens of the second embodiment, in the CIE 1976 (L*, a*, b*) color system, b* is preferably −10 to +10, more preferably −9 to +9, and even more preferably −8 to +8.

In the eyeglass lens of the second embodiment, the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a is 1.00 to 2.50.
This allows the resulting eyeglass lens to achieve a good balance between having a natural color tone with suppressed blue colors and being able to clearly recognize red and green colors of an object.
From the above viewpoints, the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a is preferably 1.10 to 2.20, more preferably 1.20 to 2.00, and even more preferably 1.30 to 1.80.

The integral value of the absorptance from 560 nm to 610 nm may be from 1800% to 2800%, and is preferably from 2000% to 2500%.
The integrated value of the absorptance from 400 nm to 520 nm may be from 2800% to 4800%, and preferably is from 3000% to 4500%.

The eyeglass lens according to any one of claims 1 to 3, wherein a color difference parameter ΔC* _R-G of the CIE 1976 (L*, a*, b*) color system calculated by the following formula (1) is 0 or more and 10 or less.
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE*=(ΔL* ² +Δa* ² +Δb* ² ) ^1/2 ...(2)
(In formula (1), ΔE* _R−G represents the color difference between red and green for a spectacle lens, calculated by formula (2) using a D65 light source;
ΔE* _R-G (w0) represents the color difference between red and green obtained by using a D65 light source for a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, a mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and a molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86.
In formula (2), ΔL* represents the lightness difference, Δa represents the chromaticity difference in the red-green direction, and Δb represents the chromaticity difference in the blue-yellow direction.

In the eyeglass lens of the second embodiment, since ΔC* _RG is 0 or more, the color difference between red and green is greater than a certain level compared to the comparative optical material, and therefore the red and green colors of an object can be recognized more clearly.
By having ΔC* _RG be 10 or less, the color difference between red and green does not become too large, and as a result, when viewing an object through the eyeglass lenses, brightness is not lost and red and green can be clearly recognized.

The color difference parameter ΔC* _R-G of the CIE1976 (L*, a*, b*) color system is, from the viewpoint of making it easier to more clearly recognize the red and green colors of an object, preferably 3 or more and 9 or less, more preferably 3.5 or more and 9 or less, even more preferably 3.7 or more and 8.5 or less, and particularly preferably 4 or more and 8 or less.

ΔC* _RG can be measured by the method described in the Examples below.

In the eyeglass lens of the second embodiment, the above-mentioned ΔC*R-G can be adjusted by appropriately adjusting, for example, the type, amount, combination, etc. of pigments contained in the eyeglass lens, the type, amount, combination, etc. of additives such as ultraviolet absorbers that are contained in the eyeglass lens as necessary, and the type, amount, combination, _etc. of polymers that are contained in the eyeglass lens as necessary.

The thickness of the eyeglass lens of the second embodiment is not particularly limited, and may be, for example, 0.5 mm to 10 mm, 1 mm to 5 mm, or 1.5 mm to 3 mm. As an example, the thickness of the eyeglass lens of the second embodiment may be 2 mm.
In the second embodiment, the thickness of the eyeglass lens means the maximum thickness.

(First dye)
The spectacle lens of the second embodiment preferably contains a first dye having a maximum absorption wavelength in the range of 560 nm to 610 nm. The first dye may be of one type alone or of two or more types.
Details of the first dye in the second embodiment, such as a specific aspect, a preferred aspect, and a preferred content, are similar to those of the first dye in the first embodiment, such as a specific aspect, a preferred aspect, and a preferred content.

(Second Dye)
The spectacle lens of the second embodiment preferably contains a second dye having a maximum absorption wavelength in the range of 400 nm to 520 nm. The second dye may be of one type alone or of two or more types.
Details of the second dye in the second embodiment, such as a specific aspect, a preferred aspect, and a preferred content, are similar to those of the second dye in the first embodiment, such as a specific aspect, a preferred aspect, and a preferred content.

(Polymer)
The functional layer in the second embodiment preferably contains a polymer.
Details of the specific aspects, preferred aspects, preferred content, etc. of the polymer in the second embodiment are similar to the details of the specific aspects, preferred aspects, preferred content, etc. of the polymer in the first embodiment.

(Additives)
The eyeglass lens of the second embodiment may contain additives as components other than those described above.
Examples of the additives include a polymerization catalyst, an internal mold release agent, a dye, an ultraviolet absorber, etc. In the second embodiment, when the polyurethane and the polythiourethane are obtained, a polymerization catalyst may or may not be used.
Details of specific aspects, preferred aspects, preferred contents, etc. of each additive, such as a polymerization catalyst, an internal mold release agent, a dye, and an ultraviolet absorber, in the second embodiment are similar to the details of specific aspects, preferred aspects, preferred contents, etc. of each additive, such as a polymerization catalyst, an internal mold release agent, a dye, and an ultraviolet absorber, in the first embodiment.

The eyeglass lens of the second embodiment may contain a color tone adjusting agent, but does not necessarily have to contain one.
As described above, the eyeglass lens of the second embodiment has a natural color tone with suppressed blue color even without including a color tone adjusting agent, and therefore does not need to include a color tone adjusting agent.

As the color tone adjusting agent, a material having an absorption band in the orange to yellow wavelength region of the visible light range and having a function of adjusting the hue of a spectacle lens containing a polymer may be used.
A bluing agent may be used as the color tone adjusting agent. The bluing agent may have an absorption band in the orange to yellow wavelength region of the visible light range and have a function of adjusting the hue of the eyeglass lens made of a resin material. The bluing agent may contain a substance that exhibits a blue to purple color.

The eyeglass lens of the second embodiment has a natural color tone with suppressed blue even without a color tone adjuster, but may contain a color tone adjuster. If the eyeglass lens contains a color tone adjuster, the content of the color tone adjuster may be relatively small.
When the eyeglass lens of the second embodiment contains a color tone adjusting agent, the content of the color tone adjusting agent may be, for example, 5 ppm or less, or 3 ppm or less.
Furthermore, there is no particular lower limit for the content of the color tone adjusting agent in the eyeglass lens of the second embodiment. For example, the content of the color tone adjusting agent may be 0 ppm or more, or may be more than 0 ppm.

(Luminous transmittance)
From the viewpoint of visibility, the spectacle lens of the second embodiment preferably has a luminous transmittance of 65% or more, more preferably 68% or more, and even more preferably 70% or more.
The luminous transmittance can be measured using a spectrophotometer (for example, CM-5 manufactured by Konica Minolta) using a 2 mm thick eyeglass lens.

<Composition for eyeglass lenses>
The eyeglass lens can be produced, for example, by using the eyeglass lens composition described below.
The composition for eyeglass lenses comprises a first dye having a maximum absorption wavelength a in the range of 560 nm to 610 nm in a spectrum measured in accordance with CIE 1976, and a second dye having a maximum absorption wavelength b in the range of 400 nm to 520 nm in a spectrum measured in accordance with CIE 1976, and the ratio of the integral of the peak at maximum absorption wavelength b to the integral of the peak at maximum absorption wavelength a is 1.00 to 2.50.

The composition for eyeglass lenses may contain the above-mentioned polymer or the above-mentioned monomer, and may also contain additives such as ultraviolet absorbers.

The preferred pigment content in the second embodiment is the same as the preferred pigment content in the first embodiment.

The details of the manufacturing method of a composition for eyeglass lenses, such as the mixing method in the second embodiment, are the same as the details of the manufacturing method of a composition for eyeglass lenses, such as the mixing method in the first embodiment.

<Eyeglass Lens Form>
Examples of the spectacle lens of the second embodiment include a spectacle lens made of a functional layer, and a spectacle lens made of a functional layer and a coating layer.

The details of the specific aspects of the coating layer in the second embodiment, the manufacturing method, the types of additives that may be included in the coating layer, the preferred content of pigment, etc. are similar to the details of the specific aspects of the coating layer in the first embodiment, the manufacturing method, the types of additives that may be included in the coating layer, the preferred content of pigment, etc.

The eyeglass lens of the second embodiment preferably further includes an anti-reflection layer on the surface.
Specific aspects, preferred aspects, details of the manufacturing method, etc. of the antireflection layer in the second embodiment are similar to those of the antireflection layer in the first embodiment.

The primer layer is usually formed between the hard coat layer and the lens substrate.
The details of the specific aspects, preferred aspects, production method, etc. of the primer layer in the second embodiment are similar to the details of the specific aspects, preferred aspects, production method, etc. of the primer layer in the first embodiment.

The hard coat layer is a coating layer intended to impart functions such as scratch resistance, abrasion resistance, moisture resistance, warm water resistance, heat resistance, weather resistance, etc. to the lens surface.
The details of the hard coat layer in the second embodiment, such as specific aspects, preferred aspects, and manufacturing method, are similar to those of the hard coat layer in the first embodiment, such as specific aspects, preferred aspects, and manufacturing method.

Eyewear
The eyewear of the second embodiment may include at least two optical members, an objective-side optical member and an eye-side optical member opposed to the objective-side optical member,
In a spectrum measured in accordance with CIE1976 between the outermost surface of the objective-side optical member on the objective side and the outermost surface of the eye-side optical member on the eye side,
(A) the maximum absorption wavelength a is within the range of 560 nm to 610 nm,
(B) the maximum absorption wavelength b is within the range of 400 nm to 520 nm;
The ratio of the integral value of the peak at the maximum absorption wavelength b to the integral value of the peak at the maximum absorption wavelength a is 1.00 to 2.50.
Details of specific aspects, preferred aspects, etc. of the eyewear in the second embodiment are similar to the details of specific aspects, preferred aspects, etc. of the eyewear in the first embodiment.

The second embodiment includes the following aspects.
<2-1> A spectacle lens including a functional layer, in which, in a spectrum measured in accordance with CIE 1976, the functional layer has (A) a maximum absorption wavelength a in the range of 560 nm to 610 nm, and (B) a maximum absorption wavelength b in the range of 400 nm to 520 nm, and the ratio of the integral of the peak of the maximum absorption wavelength b to the integral of the peak of the maximum absorption wavelength a is 1.00 to 2.50.
<2-2> The eyeglass lens according to <2-1>, wherein the difference between the maximum absorption wavelength a and the maximum absorption wavelength b is 100 nm to 200 nm.
<2-3> The eyeglass lens according to <2-1> or <2-2>, in which (a* ² +b* ² ) ^1/2 is 10 or less in the CIE1976 (L*, a*, b*) color system.
<2-4> The eyeglass lens according to any one of <2-1> to <2-3>, wherein a color difference parameter ΔC* _R−G of the CIE 1976 (L*, a*, b*) color system calculated by the following formula (1) is equal to or greater than 0 and equal to or less than 10:
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE*=(ΔL* ² +Δa* ² +Δb* ² ) ^1/2 ...(2)
(In formula (1), ΔE* _R−G represents the color difference between red and green for a spectacle lens, calculated by formula (2) using a D65 light source;
ΔE* _R-G (w0) represents the color difference between red and green obtained by using a D65 light source for a comparative optical material obtained by heating and curing a curable composition comprising an isocyanate composition containing 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, a thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and a thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole being 1.5% by mass, a mass ratio of the thiol composition 2 to the thiol composition 1 being 1.07, and a molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition being 0.86.
In formula (2), ΔL* represents the lightness difference, Δa* represents the chromaticity difference in the red-green direction, and Δb* represents the chromaticity difference in the blue-yellow direction.
<2-5> The eyeglass lens according to any one of <2-1> to <2-4>, wherein the maximum absorption wavelength b is 430 nm to 490 nm.
<2-6> The eyeglass lens according to any one of <2-1> to <2-5>, wherein the transmittance at the maximum absorption wavelength b is 3% to 60%, and the half width of the peak at the maximum absorption wavelength b is 20 nm to 100 nm.
<2-7> The eyeglass lens according to any one of <2-1> to <2-6>, wherein the transmittance at the maximum absorption wavelength a is 5% to 50%, and the half width of the peak at the maximum absorption wavelength a is 10 nm to 70 nm.
<2-8> The eyeglass lens according to any one of <2-1> to <2-7>, wherein the functional layer contains at least one polymer selected from the group consisting of polyurethane, polythiourethane, polysulfide, polycarbonate, and poly(meth)acrylate.
<2-9> The eyeglass lens according to any one of <2-1> to <2-8>, further comprising an antireflection layer on the surface.
<2-10> Eyewear that may include at least two optical members, an objective-side optical member and an eye-side optical member that faces the objective-side optical member,
In a spectrum measured in accordance with CIE1976 between the outermost surface of the objective-side optical member on the objective side and the outermost surface of the eye-side optical member on the eye side,
(A) the maximum absorption wavelength a is within the range of 560 nm to 610 nm,
(B) the maximum absorption wavelength b is within the range of 400 nm to 520 nm;
The eyewear, wherein a ratio of an integral value of the peak at the maximum absorption wavelength b to an integral value of the peak at the maximum absorption wavelength a is 1.00 to 2.50.

The first embodiment will be described in more detail below with reference to examples. However, the first embodiment is not limited to the following examples as long as it does not exceed the gist of the embodiment. Note that, unless otherwise specified, "parts" are by mass.

[Example 1]
(Lens manufacturing)
A thoroughly dried flask was charged with 0.020 g of dimethyltin(II) dichloride, 0.10 g of an internal release agent for MR (manufactured by Mitsui Chemicals, Inc.), 1.50 g of Viosorb 583 (manufactured by Kyodo Pharmaceuticals Co., Ltd., ultraviolet absorber, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole), and 46.8 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane to prepare a mixed solution (1).

Next, 0.050 g of UVY-0026 (a porphyrin compound represented by the general formula (2) by Yamamoto Chemical Industries, Ltd., in which X ₁ to X ₈ are bromine atoms, R ₁ to R ₄ are hydrogen atoms, and M is Pd) and 0.050 g of PD-311S (a tetra-t-butyl-tetraazaporphyrin copper complex represented by the above formula (1a) by Yamamoto Chemical Industries, Ltd.) were each dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane to prepare a master batch (1) in which UVY-0026 was dissolved, and a master batch (2) in which PD-311S was dissolved.

1.54 g of master batch (1) and 2.26 g of master batch (2) were added to the above mixed liquid (1) to prepare mixed liquid (2). Mixed liquid (2) was stirred at 25°C for 1 hour to completely dissolve each component and prepare a prepared liquid. Then, 23.9 g of a composition containing pentaerythritol tetrakis(3-mercaptopropionate) and 25.5 g of a composition containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane were added to this prepared liquid, and the obtained liquid was stirred at 25°C for 30 minutes to prepare a homogeneous solution.

The solution was degassed at 400 Pa for 1 hour, filtered through a 1 μm PTFE (polytetrafluoroethylene) filter, and then poured into a 4C plano glass mold with a center thickness of 2 mm and a diameter of 77 mm.

The glass mold was heated from 25°C to 120°C over a period of 21 hours. It was then cooled to room temperature, and the plano lens was removed from the glass mold. The resulting plano lens was further annealed at 120°C for 2 hours. This produced the lens of Example 1.

(Creating a standard lens)
A mixture was prepared by charging 0.020 g of dimethyltin(II) dichloride, 0.10 g of an internal release agent for MR (manufactured by Mitsui Chemicals, Inc.), 1.50 g of Viosorb 583 (manufactured by Kyodo Pharmaceuticals, Inc., ultraviolet absorber, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole), and 50.6 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane into a thoroughly dried flask. 23.9 g of a composition containing pentaerythritol tetrakis(3-mercaptopropionate) and 25.5 g of a composition containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane were charged into the mixture, and the resulting liquid was stirred at 25°C for 30 minutes to obtain a homogeneous solution.

The solution was degassed at 400 Pa for 1 hour, filtered through a 1 μm PTFE filter, and then poured into a 4C plano glass mold with a center thickness of 2 mm and a diameter of 77 mm.

The glass mold was heated from 25°C to 120°C over a period of 21 hours. It was then cooled to room temperature and the plano lens was removed from the glass mold. The resulting plano lens was further annealed at 120°C for 2 hours. This produced a standard lens.

[Examples 2 and 3, Comparative Example 6]
Lenses were prepared in the same manner as in Example 1, except that the content of UVY-0026 in Example 1 was changed as shown in Table 1, or the content of each dye in Example 1 was changed as shown in Table 4.

[Example 4]
A lens of Example 4 was produced in the same manner as in Example 1, except that 1.0 g of Tinuvin 326 (manufactured by BASF Japan Ltd., ultraviolet absorber, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole) was used instead of 1.50 g of Viosorb 583 in Example 1, the master batch (1) in which UVY-0026 was dissolved was not used, and the content of PD-311S was changed as shown in Table 1.

[Examples 5 and 6]
Lenses were prepared in the same manner as in Example 4, except that the content of PD-311S in Example 4 was changed as shown in Table 1.

[Example 7]
A lens of Example ₇ was produced in the same manner as in Example 1, except that master batch (3) prepared by dissolving UVY-1023 (manufactured by Yamamoto Chemical Industry Co., Ltd., a porphyrin compound represented by the general formula (2), in which X ₁ to X 8 are 3,3-dimethyl-1-butynyl groups, R ₁ to R ₄ are hydrogen atoms, and M is Pd) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used in place of master batch (1) prepared by dissolving UVY-0026 in Example 1, and the content of PD-311S was changed as shown in Table 1.

[Example 8]
A lens of Example 8 was prepared in the same manner as in Example 7, except that the content of each dye in Example 7 was changed as shown in Table 1.

[Example 9]
A lens of Example 9 was produced in the same manner as in Example 1, except that the master batch (1) in which UVY-0026 was dissolved was not used and the content of PD-311S was changed as shown in Table 2.

[Example 10]
A lens of Example 10 was produced in the same manner as in Example 1, except that the master batch (3) in which UVY-1023 was dissolved was additionally added to Example 1, and the contents of each dye were changed as shown in Table 2.

[Example 11]
A lens of Example 11 was produced in the same manner as in Example 1, except that master batch (4) prepared by dissolving FDB-001 (manufactured by Yamada Chemical Co., Ltd., copper porphyrin complex) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of master batch (1) prepared by dissolving UVY-0026 in Example 1, and the content of each dye was changed as shown in Table 2.

[Example 12]
A lens of Example 12 was produced in the same manner as in Example 11, except that the master batch (4) in which FDB-001 was dissolved was replaced with a master batch (5) in which FDB-002 (vanadium porphyrin complex, manufactured by Yamada Chemical Co., Ltd.) was dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane.

[Example 13]
A lens of Example 13 was produced in the same manner as in Example 11, except that the master batch (4) in which FDB-001 was dissolved was replaced with a master batch (6) in which FDB-003 (a merocyanine dye, manufactured by Yamada Chemical Co., Ltd.) was dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane, and the content of each dye was changed as shown in Table 2.

[Example 14]
A lens of Example 14 was produced in the same manner as in Example 11, except that a master batch (7) prepared by dissolving FDB-004 (manufactured by Yamada Chemical Co., Ltd., an oil-soluble dye) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11.

[Example 15]
A lens of Example 15 was produced in the same manner as in Example 11, except that the master batch (4) in which FDB-001 was dissolved was replaced with a master batch (8) in which FDB-006 (a merocyanine dye, manufactured by Yamada Chemical Co., Ltd.) was dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane.

[Example 16]
A lens of Example 16 was produced in the same manner as in Example 11, except that a master batch (9) prepared by dissolving ABS 425 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11.

[Example 17]
A lens of Example 17 was produced in the same manner as in Example 11, except that a master batch (10) prepared by dissolving ABS 430 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11.

[Example 18]
A lens of Example 18 was produced in the same manner as in Example 11, except that a master batch (11) prepared by dissolving ABS 439 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11.

[Example 19]
A lens of Example 19 was produced in the same manner as in Example 11, except that a master batch (12) prepared by dissolving ABS 462 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11.

[Example 20]
A lens of Example 20 was produced in the same manner as in Example 11, except that a master batch (13) prepared by dissolving ABS 473 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001 in Example 11, and the content of each dye was changed as shown in Table 3.

[Example 21]
A lens of Example 21 was produced in the same manner as in Example 1, except that a master batch (14) prepared by dissolving ABS 574 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (2) prepared by dissolving PD-311S in Example 1, and the content of each dye was changed as shown in Table 3.

[Example 22]
A lens of Example 22 was produced in the same manner as in Example 21, except that a master batch (15) prepared by dissolving ABS 584 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (14) prepared by dissolving ABS 574 in Example 21.

[Example 23]
A lens of Example 23 was produced in the same manner as in Example 21, except that a master batch (16) prepared by dissolving ABS 594 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (14) prepared by dissolving ABS 574 in Example 21.

[Comparative Example 1]
The standard lens produced in Example 1 was used as the lens of Comparative Example 1.

[Comparative Example 2]
A lens of Comparative Example 2 was prepared in the same manner as in Comparative Example 1, except that 1.0 g of Tinuvin 326 was used instead of 1.50 g of Viosorb 583.

[Comparative Example 3]
A lens of Comparative Example 3 was produced in the same manner as in Example 1, except that master batch (17) prepared by dissolving FDG-003 (Yamada Chemical Co., Ltd., merocyanine dye) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of master batch (2) prepared by dissolving PD-311S in Example 1, and the content of each dye was changed as shown in Table 4.

[Comparative Example 4]
A lens of Comparative Example 4 was produced in the same manner as in Example 1, except that in Example 1, master batch (3) having UVY-1023 dissolved therein was used instead of master batch (1) having UVY-0026 dissolved therein, master batch (2) having PD-311S dissolved therein was not used, and the content of the dye was changed as shown in Table 4.

[Comparative Example 5]
A lens of Comparative Example 5 was produced in the same manner as in Example 1, except that the master batch (2) in which PD-311S was dissolved in Example 1 was not used and the content of the dye was changed as shown in Table 4.

(Color difference evaluation: measurement of L*, a*, and b* in the CIE1976 (L*, a*, b*) color system)
A spectrophotometer CM-5 (manufactured by Konica Minolta, Inc.) was used as the measuring device. Any one of the following Munsell color charts 1 to 3 was used under a D65 light source, and a lens of each Example and Comparative Example having a thickness of 2 mm, and a standard lens having a thickness of 2 mm were placed between any one of the Munsell color charts and the measuring part. Then, for each color chart, L* (L*red, L*green, L*blue), a* (a*red, a*green, a*blue), and b* (b*red, b*green, b*blue) in the CIE1976 (L*, a*, b*) color system were measured. Using the L*, a*, and b* determined as described above, ΔE* _R-G , ΔE*R-G (w0), ΔE* _R-B , and ΔE*R- _B (w0) were determined based on the following formulas ( _2A) and (2B), respectively, and ΔC* _R-G and ΔC* _R-B were determined based on formulas (1) and (3).
Munsell color chart 1: Munsell color system red (4.5R4/13)
Munsell color chart 2: Munsell color system green (4.5G5/8)
Munsell color scale 3: Munsell blue (3PB3/11)
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE* _R−G = [(L* red − L* green) ² + (a* red − a* green) ² + (b* red − b* green) ² ] ^1/2 ... (2A)
ΔE* _R−B =[(L*red−L*blue) ^² +(a*red−a*blue) ^² +(b*red−b*blue) ^² ] ^½ ...(2B)
ΔC* _RB = ΔE* _RB -ΔE* _RB (w0)...(3)

(Blue light blocking rate)
Using a UV-1800 UV-visible spectrophotometer (manufactured by Shimadzu Corporation) and lenses of each Example and Comparative Example having a thickness of 2 mm, the blue light absorptance from 380 nm to 500 nm in the spectrum measured in accordance with EN ISO12312-1:2013 (blue light cut rate shown by the following formula) was determined.
The blue light blocking rate was evaluated based on the following evaluation criteria.
-Evaluation criteria-
A: The blue light blocking rate was 30% or more.
B: The blue light blocking rate was 20% or more and less than 30%.
C: The blue light blocking rate was 15% or more and less than 20%.
D: The blue light blocking rate was less than 15%.

(Half width)
A transmittance curve was measured using an ultraviolet-visible spectrophotometer UV-1800 (manufactured by Shimadzu Corporation) and a lens having a thickness of 2 mm in each of the Examples and Comparative Examples, and the maximum absorption wavelength, the transmittance at the maximum absorption wavelength, the luminous transmittance in accordance with ISO 8980-3:2013, and the half-width of the absorption peak at the maximum absorption wavelength a were each determined.
The transmittance curves for the lenses of Examples 1 to 8 are shown in FIG. 1, the transmittance curves for the lenses of Examples 9 to 15 are shown in FIG. 2, the transmittance curves for the lenses of Examples 16 to 23 are shown in FIG. 3, and the transmittance curves for the lenses of Comparative Examples 1 to 6 are shown in FIG.

(Evaluation of clarity)
The lenses of each Example and Comparative Example were placed in front of a personal computer (PC) screen, and an image displayed on the PC screen was viewed through the lenses of each Example and Comparative Example. The change in appearance was evaluated for clarity based on the following evaluation criteria.
-Evaluation criteria-
The image displayed on the APC screen appeared brighter or clearer than when viewed without the lens.
B: The image displayed on the PC screen looked the same as when viewed without the lens.
Compared with an image displayed on a CPC screen viewed without passing through the lenses, the color tone was unnatural, the image appeared darker, or the image was difficult to see.

The evaluation results when the lenses of each Example and Comparative Example were used are shown in the following Tables 1 to 4. In Tables 1 and 2, "-" means that the corresponding component is not contained or that the evaluation target does not exist, and a blank space means that no evaluation was performed.
In addition, in Tables 1 to 4, when two transmittances at maximum absorption wavelengths are listed as in Example 1, the value in the upper row is the transmittance value at the maximum absorption wavelength on the short wavelength side (455 nm in Example 1), and the value in the lower row is the transmittance value at the maximum absorption wavelength on the high wavelength side (588 nm in Example 1).

As shown in Tables 1 to 4, the lenses of Examples 1 to 23 were rated as having better clarity than the lenses of Comparison Examples 1 to 6.

The second embodiment will be described in more detail below with reference to examples. However, the second embodiment is not limited to the following examples as long as it does not exceed the gist of the embodiment. Note that, unless otherwise specified, "parts" are based on mass.

[Example 201]
(Lens manufacturing)
A thoroughly dried flask was charged with 0.020 g of dimethyltin(II) dichloride, 0.10 g of an internal release agent for MR (manufactured by Mitsui Chemicals, Inc.), 1.50 g of Viosorb 583 (manufactured by Kyodo Pharmaceuticals Co., Ltd., ultraviolet absorber, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole), and 46.8 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane to prepare a mixed solution (1).

Next, 0.050 g of UVY-0026 (manufactured by Yamamoto Chemical Industries, Ltd.) and 0.050 g of PD-311S (manufactured by Yamamoto Chemical Industries, Ltd.) were each dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane to prepare a master batch (1) in which UVY-0026 was dissolved, and a master batch (2) in which PD-311S was dissolved.

1.54 g of master batch (1) and 2.26 g of master batch (2) were added to the above mixed liquid (1) to prepare mixed liquid (2). The mixed liquid (2) was stirred at 25°C for 1 hour to completely dissolve each component and prepare a prepared liquid. Then, 23.9 g of a composition containing pentaerythritol tetrakis(3-mercaptopropionate) and 25.5 g of a composition containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane were added to the prepared liquid, and the obtained liquid was stirred at 25°C for 30 minutes to prepare a homogeneous solution.
Table 5 shows the content of each dye in the homogeneous solution.

The solution was degassed at 400 Pa for 1 hour, filtered through a 1 μm PTFE (polytetrafluoroethylene) filter, and then poured into a 4C plano glass mold with a center thickness of 2 mm and a diameter of 77 mm.

The glass mold was heated from 25°C to 120°C over a period of 21 hours. It was then cooled to room temperature, and the plano lens was removed from the glass mold. The resulting plano lens was further annealed at 120°C for 2 hours. This produced the lens of Example 201.

(Creating a standard lens)
A mixture was prepared by charging 0.020 g of dimethyltin(II) dichloride, 0.10 g of an internal release agent for MR (manufactured by Mitsui Chemicals, Inc.), 1.50 g of Viosorb 583 (manufactured by Kyodo Pharmaceuticals, Inc., ultraviolet absorber, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole), and 50.6 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane into a thoroughly dried flask. 23.9 g of a composition containing pentaerythritol tetrakis(3-mercaptopropionate) and 25.5 g of a composition containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane were charged into the mixture, and the resulting liquid was stirred at 25°C for 30 minutes to obtain a homogeneous solution.

The solution was degassed at 400 Pa for 1 hour, filtered through a 1 μm PTFE filter, and then poured into a 4C plano glass mold with a center thickness of 2 mm and a diameter of 77 mm.

The glass mold was heated from 25°C to 120°C over a period of 21 hours. It was then cooled to room temperature and the plano lens was removed from the glass mold. The resulting plano lens was further annealed at 120°C for 2 hours. This produced a standard lens.

[Example 202]
A lens of Example 202 was produced in the same manner as in Example 201, except that a master batch (3) prepared by dissolving UVY-1023 (manufactured by Yamamoto Chemical Industry Co., Ltd.) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (1) prepared by dissolving UVY-0026, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Example 203]
A lens of Example 203 was produced in the same manner as in Example 201, except that a master batch (4) prepared by dissolving FDB-001 (manufactured by Yamada Chemical Co., Ltd.) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (1) prepared by dissolving UVY-0026, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Example 204]
A lens of Example 204 was produced in the same manner as in Example 203, except that a master batch (5) prepared by dissolving ABS 430 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (4) prepared by dissolving FDB-001, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Example 205]
A lens of Example 205 was produced in the same manner as in Example 201, except that a master batch (6) prepared by dissolving ABS 574 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (2) prepared by dissolving PD-311S, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Example 206]
A lens of Example 206 was produced in the same manner as in Example 205, except that a master batch (7) prepared by dissolving ABS 594 (manufactured by Luxottica) in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (6) prepared by dissolving ABS 574, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Comparative Example 201]
A lens of Comparative Example 201 was produced in the same manner as in Example 201, except that a master batch (8) in which FDG-003 (Yamada Chemical Co., Ltd.) was dissolved in 100.0 g of a composition containing 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane was used instead of the master batch (2) in which PD-311S was dissolved, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

[Comparative Example 202]
A lens of Comparative Example 202 was produced in the same manner as in Example 201, except that the master batch (2) in which PD-311S was dissolved was not used, the above-mentioned master batch (3) in which UVY-1023 was dissolved was used instead of the master batch (1) in which UVY-0026 was dissolved, and the content of each dye in the homogeneous solution was changed as shown in Table 5.

～Evaluation～
(Yellowness index (YI value))
Using a spectrophotometer CM-5 manufactured by Konica Minolta having a pulsed xenon lamp, measurements were taken three times in accordance with ASTM E313-73 using a transmission method at room temperature, a viewing angle of 2°, and a C-type light source, and the average value was calculated. The measurement wavelength range was 360 nm to 740 nm.

(Color difference evaluation: measurement of L*, a*, and b* in the CIE1976 (L*, a*, b*) color system)
A spectrophotometer CM-5 (manufactured by Konica Minolta, Inc.) was used as the measuring instrument. Any one of the following Munsell color charts 1 to 3 was placed under a D65 light source, and a lens of each Example and Comparative Example having a thickness of 2 mm, and a standard lens having a thickness of 2 mm were placed between any one of the above Munsell color charts and the measuring part. Then, for each color chart, L* (L* red, L* green), a* (a* red, a* green), and b* (b* red, b* green) in the CIE1976 (L*, a*, b*) color system were measured. Using the L*, a*, and b* obtained as described above, ΔE* _R-G and ΔE* _R-G (w0) were obtained based on the following formula (2A), and ΔC* _R-G was obtained based on formula (1).
Munsell color chart 1: Munsell color system red (4.5R4/13)
Munsell color chart 2: Munsell color system green (4.5G5/8)
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE* _R−G = [(L* red − L* green) ² + (a* red − a* green) ² + (b* red − b* green) ² ] ^1/2 ... (2A)

(Half width)
A transmittance curve was measured using an ultraviolet-visible spectrophotometer UV-1800 (manufactured by Shimadzu Corporation) and a lens having a thickness of 2 mm in each of the Examples and Comparative Examples, and the maximum absorption wavelength, the transmittance at the maximum absorption wavelength, the luminous transmittance in accordance with ISO 8980-3:2013, and the half-width of the absorption peak whose maximum absorption wavelength was in the range of 400 nm to 520 nm were each determined.
The transmittance curves for the lenses of Examples 201 to 206 are shown in FIG. 5, and the transmittance curves for the lenses of Comparative Examples 201 and 202 are shown in FIG.

(Evaluation of clarity)
The lenses of each Example and Comparative Example were placed in front of a personal computer (PC) screen, and an image displayed on the PC screen was viewed through the lenses of each Example and Comparative Example. The change in appearance was evaluated for clarity based on the following evaluation criteria.
Incidentally, a clarity level of A means that the effect of being able to clearly recognize the red and green colors of an object is excellent.
-Evaluation criteria-
The image displayed on the APC screen appeared brighter or clearer than when viewed without the lens.
B: The image displayed on the PC screen looked the same as when viewed without the lens.
Compared to an image displayed on a CPC screen viewed without the lens, the color tones were unnatural, and red and green colors were difficult to discern clearly.

(exterior)
The lenses of each of the examples and comparative examples were evaluated according to the following evaluation criteria.
In addition, appearance grade A means that the product has a natural color tone with suppressed blue color.
-Evaluation criteria-
A: No blue color was visible in the lens color tone.
B: A slight blue tinge was visible in the lens color tone, but was within the range of natural color tones.
C: The lens had a clearly visible blue color, and the color tone was unnatural.

The evaluation results when the lenses of each Example and Comparative Example were used are shown in the following Table 5. In Table 5, "-" means that the corresponding component is not contained or that the evaluation target does not exist.
In addition, in Table 5, when two transmittances at maximum absorption wavelengths are listed, such as in Example 201, the value in the upper row is the transmittance value at the maximum absorption wavelength on the short wavelength side (455 nm in Example 201), and the value in the lower row is the transmittance value at the maximum absorption wavelength on the high wavelength side (588 nm in Example 201).

As shown in Table 5, examples using eyeglass lenses including a functional layer, in which, in a spectrum measured in accordance with CIE1976, (A) a maximum absorption wavelength a is present in the range of 560 nm to 610 nm, (B) a maximum absorption wavelength b is present in the range of 400 nm to 520 nm, and the ratio of the peak integral value of the maximum absorption wavelength b to the peak integral value of the maximum absorption wavelength a is 1.00 to 2.50, were excellent in the evaluation of appearance and therefore excellent in the effect of having a natural color tone with suppressed blue.Furthermore, they were excellent in the evaluation of sharpness and therefore excellent in the effect of clearly recognizing the red and green of an object.
On the other hand, (A) Comparative Examples 201 and 202, in which the maximum absorption wavelength a does not exist within the range of 560 nm to 610 nm and the ratio of the integral value of the peak of the maximum absorption wavelength b to the integral value of the peak of the maximum absorption wavelength a exceeds 2.5, were inferior in the evaluation of appearance and therefore inferior in the effect of having a natural color tone with suppressed blue.Furthermore, they were inferior in the evaluation of sharpness and therefore inferior in the effect of clearly recognizing red and green of an object.
Among the Examples, Example 201 and Examples 203 to 206, which used eyeglass lenses in which the ratio of the integral value of the peak at maximum absorption wavelength b to the integral value of the peak at maximum absorption wavelength a was 1.4 to 2.5, were excellent in the evaluation of clarity and therefore excellent in the effect of clearly recognizing red and green of an object.Furthermore, they were excellent in the evaluation of appearance and therefore excellent in the effect of having a natural color tone with suppressed blue.

The disclosures of Japanese Patent Application No. 2020-199122, filed on November 30, 2020, and Japanese Patent Application No. 2021-040099, filed on March 12, 2021, are incorporated by reference in their entirety into this specification.
All publications, patent applications, and standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or standard was specifically and individually indicated to be incorporated by reference.

Claims (11)

The present invention comprises one or more dyes, and in a transmittance curve, (A) a maximum absorption wavelength a is present in the range of 560 nm to 610 nm, and when a D65 light source is used, a color difference parameter ΔC* _{R-G of the CIE1976 (L*, a*, b*) color system calculated from the following formula (1) and the following formula (2A} ) is 3.1 or more and 8.0 or less,
In the transmittance curve, the optical material further comprises (B) a maximum absorption wavelength b in the range of 440 nm to 480 nm.
ΔC* _RG = ΔE* _RG -ΔE* _RG (w0)...(1)
ΔE* _R−G = [(L* red − L* green) ² + (a* red − a* green) ² + (b* red − b* green) ² ] ^1/2 ... (2A)
(In formula (1), ΔE* _R−G represents the color difference between red and green of the optical material obtained using formula (2A), and ΔE* _R−G (w0) is a comparative optical material obtained by heating and curing a curable composition comprising 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane-containing isocyanate composition, thiol composition 1 containing pentaerythritol tetrakis(3-mercaptopropionate), and thiol composition 2 containing 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, in which the content of the 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole is 1.5% by mass, the mass ratio of the thiol composition 2 to the thiol composition 1 is 1.07, and the molar ratio of the total of the thiol groups contained in the thiol composition 1 and the thiol composition 2 to the isocyanate groups contained in the isocyanate composition is 0.86, and the color difference between red and green is determined using the formula (2A) by using a D65 light source.
In formula (2A), L*red, L*green, a*red, a*green, b*red, and b*green are parameters obtained by measuring L* (L*red, L*green, L*blue), a* (a*red, a*green, a*blue), and b* (b*red, b*green, b*blue) in the CIE1976 (L*, a*, b*) color system for each color tag of the Munsell color system red (4.5R4/13), the Munsell color system green (4.5G5/8), and the Munsell color system blue (3PB3/11) for an optical material having a thickness of 2 mm and a comparative optical material having a thickness of 2 mm . The optical material according to claim 1, wherein the ratio of the integral value of the peak at the maximum absorption wavelength b to the integral value of the peak at the maximum absorption wavelength a is 1.00 to 2.50. The optical material according to claim 1 or 2, wherein the difference between the maximum absorption wavelength a and the maximum absorption wavelength b is 130 nm to 200 nm. The optical material according to any one of claims 1 to 3, wherein the half-width of the absorption peak of the maximum absorption wavelength a is 10 nm to 70 nm. a first dye having a maximum absorption wavelength in the range of 560 nm to 610 nm;
5. The optical material according to claim 1, wherein the first dye contains a tetraazaporphyrin-based metal complex compound. The optical material according to any one of claims 1 to 5, wherein the blue light absorption rate in the range of 380 nm to 500 nm in the spectrum measured in accordance with EN ISO12312-1:2013 is 15% to 50% when the optical material has a thickness of 2 mm. 7. The optical material according to claim 1, wherein (a* ² +b* ² ) ^1/2 is 10 or less in the CIE1976 (L*, a*, b*) color system. 8. The optical material according to claim 1, wherein a color difference parameter ΔC* _R-B of the CIE1976 (L*, a*, b*) color system calculated from the following formula (2B) and the following formula (3) by using a D65 light source is 0 or more and 7 or less.
ΔC* _RB = ΔE* _RB -ΔE* _RB (w0)...(3)
ΔE* _R−B =[(L*red−L*blue) ^² +(a*red−a*blue) ^² +(b*red−b*blue) ^² ] ^½ ...(2B)
(In formula (3), ΔE* _R−B represents the color difference between red and blue of the optical material calculated using formula (2B), and ΔE* _R−B (w0) is a comparative optical material obtained by heating and curing a curable composition comprising 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2,5(6)-bis(isocyanatomethyl)-bicyclo[2.2.1]heptane-containing isocyanate composition, pentaerythritol tetrakis(3-mercaptopropionate)-containing thiol composition 1, and 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane-containing thiol composition 2, in which the content of 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole is 1.5% by mass, the mass ratio of thiol composition 2 to thiol composition 1 is 1.07, and the molar ratio of the total of the thiol groups contained in thiol composition 1 and thiol composition 2 to the isocyanate groups contained in the isocyanate composition is 0.86, and the color difference between red and blue is determined using the formula (2B) by using a D65 light source.
In formula (2B), L*red, L*blue, a*red, a*blue, b*red, and b*blue are parameters obtained by measuring L*(L*red, L*green, L*blue), a*(a*red, a*green, a*blue), and b*(b*red, b*green, b*blue) in the CIE1976 (L*, a*, b*) color system for each color tag of the Munsell color system red (4.5R4/13), the Munsell color system green (4.5G5/8), and the Munsell color system blue (3PB3/11) for an optical material having a thickness of 2 mm and a comparative optical material having a thickness of 2 mm . The optical material according to any one of claims 1 to 8, which contains at least one polymer selected from the group consisting of polyurethane, polythiourethane, polysulfide, polycarbonate, and poly(meth)acrylate. A lens comprising the optical material according to any one of claims 1 to 9. The lens according to claim 10 for use in eyeglass lenses.