JP5595058B2 - Laminated body - Google Patents

Description

The present invention relates to a laminate that exhibits fluorescence.

Conventionally, a molded article containing a phosphor such as a fluorescent pigment that emits light when irradiated with ultraviolet rays is known. Such phosphors are used as high-design materials in various fields because they exhibit different hues when irradiated with ultraviolet rays and when not irradiated. For example, Patent Document 1 describes a decorative lighting device having a light emitting part drawn with a fluorescent paint and an ultraviolet light source that irradiates ultraviolet light from the light emitting part to a light emitting part provided across a travel path. . However, the light emitted from the light source may be diffused before being applied to the light emitting unit, or ultraviolet light that is not used for fluorescent light emission in the light emitting unit may be leaked, and the light emission efficiency may be reduced. .

On the other hand, in Patent Document 2, in order to improve the visibility of the fluorescent light emitting layer, a reflective layer mirrored behind the light source is provided to prevent external leakage of ultraviolet rays and to achieve a fluorescent display with high luminance. It has been broken. However, if only a reflective layer is provided behind the light source, ultraviolet light that has not been used for fluorescent light emission in the fluorescent layer of the display unit is leaked, so that the light emission efficiency may be reduced.

JP-A-6-314505 JP 2003-29676 A

  The present invention has been made in view of the above-described problems, and in the fluorescent light-emitting laminate exhibiting different hues under visible light and ultraviolet irradiation, the luminous efficiency of the fluorescent light-emitting display portion is improved and the design is improved. The object is to obtain an excellent laminate.

As a result of intensive studies to achieve the above object, the present inventor is a laminate that emits light by irradiation with an ultraviolet light source, and exhibits a fluorescence emission layer (A) that exhibits fluorescence emission, and has a wavelength region of 300 nm to 400 nm. In order to complete the present invention, a laminate having an ultraviolet reflectance in a region of 10% or more and having a transparent or translucent ultraviolet reflecting layer (B) and a translucent substrate (C) is obtained. It came. That is, the fluorescent light-emitting laminate of the present invention has the following characteristics.

1. A laminate that emits light by irradiation with an ultraviolet light source, and a light emitting structure including an ultraviolet light source,
The laminate is a transparent or semi-transparent ultraviolet reflective layer having a fluorescent light emitting layer (A) exhibiting fluorescent light emission from the side irradiated with ultraviolet light, and having an ultraviolet reflectance of 10% or more in the entire wavelength region of 300 nm to 400 nm. (B) is laminated,
Furthermore, the translucent substrate (C) is laminated so as to be in contact with at least one of the above (A) and (B),
An ultraviolet light source (D) is provided on the fluorescent light emitting layer (A) side of the laminate ,
The light emitting structure 2, wherein the ultraviolet reflecting layer (B) contains an ultraviolet reflecting powder having a particle diameter of 0.4 μm or more and 10 μm or less and a light transmitting material, and has a thickness of 0.01 mm to 10 mm. . The laminate is a transparent or semi-transparent ultraviolet reflective layer having a fluorescent light emitting layer (A) exhibiting fluorescent light emission from the side irradiated with ultraviolet light, and having an ultraviolet reflectance of 10% or more in the entire wavelength region of 300 nm to 400 nm. (B) The translucent base material (C) is laminated. 2. Light emitting structure described in 3. 1. The translucent substrate (C) has an uneven shape at least partially. ~ 2. The light emitting structure according to any one of

The laminate of the present invention is a laminate that emits light when irradiated with an ultraviolet light source, and is a fluorescent light-emitting layer (A) that emits fluorescence from the side irradiated with ultraviolet light, and ultraviolet light in the entire wavelength region of 300 nm to 400 nm. A transparent or translucent ultraviolet reflective layer (B) having a reflectance of 10% or more is laminated, and further a translucent substrate (C) is laminated so as to be in contact with at least one of (A) and (B). By doing so, the light emission efficiency of the fluorescent light emitting display part is high and the design is excellent.

It is an example of the structure figure of this invention laminated body. It is an example of the structure figure of this invention laminated body. It is an example of the figure which looked at the light emitting structure of this invention from the top. It is an example of the figure which looked at the light emitting structure of this invention from the top. It is an example of the figure which looked at the light emitting structure of this invention from the top.

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

(Laminate)
The present invention is a laminate that emits light when irradiated with ultraviolet light, and is a laminate that emits light when irradiated with an ultraviolet light source, the fluorescent light emitting layer (A) showing fluorescence emission from the side irradiated with the ultraviolet light, wavelength A transparent or translucent ultraviolet reflective layer (B) having an ultraviolet reflectance of 10% or more in the entire region of 300 nm to 400 nm is laminated, and is further in contact with at least one of the above (A) and (B). A light-transmitting substrate (C) is laminated (FIG. 1).

The fluorescent light emitting layer (A) of the present invention is a pigment, dye or the like (hereinafter referred to as “fluorescent material”) that exhibits fluorescent light emission on a light transmitting material (hereinafter referred to as “translucent material”). Is included.

  As the translucent material, any of an inorganic material and an organic material may be used as long as it has translucency. For example, examples of the inorganic material include glass, water glass, low-melting glass, silicon resin, and alkoxysilane. Organic materials include acrylic resin, acrylic-styrene resin, cellulose acetobutyrate resin, cellulose propionate resin, polymethylpentene resin, polycarbonate resin, polystyrene resin, polyester resin, etc., or reaction-solidified epoxy resin , Acrylic resin, methacrylic resin, urethane resin and the like. In addition, “translucency” is excellent in visible light transparency and has transparency.

The fluorescent material is not limited as long as it exhibits fluorescence emission under ultraviolet irradiation, and known fluorescent dyes, fluorescent pigments, and the like can be used. In the present invention, those that do not exhibit fluorescence emission under visible light are preferred, and among these phosphors, inorganic fluorescent pigments that are excellent in fluorescence emission durability and weather resistance are particularly preferred.

  The fluorescent light emitting layer (A) is obtained by molding a composition containing the above translucent material and the above fluorescent material (hereinafter referred to as “composition for fluorescent light emitting layer”) into a film shape or a plate shape. The thickness is usually 0.01 mm to 10 mm, more preferably 0.05 to 5 mm, and the thickness may be partially changed within this range. By changing the thickness partially, the luminance of the fluorescence emission can be changed. In the composition for a fluorescent light emitting layer, it is preferable to mix 0.5 to 50 parts by weight, further 1 to 30 parts by weight of the fluorescent material with respect to 100 parts by weight of the translucent material (solid content). When the amount is less than 0.5 part by weight, the luminance of the fluorescent light emitting layer is lowered and the visibility may be inferior. Moreover, even if it adds more than 50 weight part, there exists a possibility that the improvement of a brightness | luminance cannot be confirmed.

  The ultraviolet reflective layer (B) having an ultraviolet reflectance of 10% or more in the entire wavelength region of 300 nm to 400 nm is a powder that reflects (scatters) ultraviolet rays in the wavelength region (hereinafter referred to as “ultraviolet reflective powder”). And a layer containing a light-transmitting material, and is laminated on the fluorescent light-emitting layer (A).

  By laminating the ultraviolet reflecting layer (B), the fluorescent light emitting layer (A) reflects (B) the ultraviolet rays that are going to be emitted without being used for excitation of the phosphor, and (A) is irradiated again with ultraviolet rays. By repeating fluorescence emission, luminous efficiency can be improved. In this case, the irradiated ultraviolet rays hardly pass through the layer (B) and are released.

As the translucent material, the same material as the fluorescent light emitting layer (A) can be used.
The ultraviolet reflective powder preferably has an ultraviolet reflectance of 50% or more and a refractive index of 1.5 to 2.4 over the entire wavelength region of 300 nm to 400 nm. The particle size is not particularly limited, but is usually preferably 0.2 μm or less, or 0.4 μm or more and 10 μm or less. By setting it as the said range, while reflecting an ultraviolet-ray efficiently and diffusing fluorescence emission (visible light), the outstanding light-emitting luminance can be obtained. As such an ultraviolet reflective powder, for example, alumina, zirconium oxide, barium sulfate, calcium carbonate, or the like can be used.

The ultraviolet reflecting layer (B) is a transparent or semi-transparent composition containing the above translucent material and the above ultraviolet reflecting powder (hereinafter referred to as “ultraviolet reflecting layer composition”) and has a wavelength region of 300 nm. It is formed into a film shape or a plate shape so that the ultraviolet reflectance at ˜400 nm is 10% or more. The thickness is transparent or translucent, and may be set as appropriate within a range that satisfies the above-described ultraviolet reflectance, and is usually 0.01 mm to 10 mm, more preferably 0.05 to 5 mm. The thickness may be partially changed. By changing the thickness partially, the luminance of the fluorescence emission can be changed.
Although the composition for ultraviolet reflective layer depends on the type of ultraviolet reflective powder used and the thickness of the ultraviolet reflective layer to be molded, the ultraviolet reflective powder with respect to 100 parts by weight of the translucent material (solid content). Is preferably 10 to 400 parts by weight, more preferably 30 to 300 parts by weight. If it is such a range, the effect of this invention will be easy to be acquired.

  Moreover, the ultraviolet reflective layer (B) of this invention should just be transparent or translucent so that light emission of a fluorescence light emitting layer can be visually recognized through an ultraviolet reflective layer, when an ultraviolet-ray is irradiated to this invention laminated body.

Specifically, the concealment rate of the ultraviolet reflecting layer (B) is preferably 70% or less (preferably 15% to 60%). If it exceeds 70%, the visibility of fluorescent emission may be reduced. Further, by setting the concealment rate to 15% or more, the shape of the light source on the fluorescent light emitting layer side can be made difficult to be visually recognized through the ultraviolet reflecting layer.
As a method for measuring the concealment rate, there is a method in which an ultraviolet reflection layer is placed on a concealment rate test paper and the concealment rate is calculated from the luminous reflectance of white ground and black ground.
The luminous reflectance can be measured and calculated using a color difference meter (“CR-300” manufactured by Minolta Co., Ltd.).

In addition, the ultraviolet reflection layer reflects ultraviolet rays that are about to be emitted without being used for excitation of the phosphor by having an ultraviolet reflectance of 10% or more (preferably 25% or more) in the entire wavelength region of 300 nm to 400 nm. Then, the light emission efficiency can be improved by irradiating ultraviolet rays again to (A) and repeating the fluorescence emission.
When the ultraviolet reflectance is less than 10%, there is a possibility that ultraviolet rays may leak out, which may hinder the effect of improving the luminous efficiency of the fluorescent light emitting layer.
The ultraviolet reflectance is a value measured with a spectrophotometer (manufactured by Shimadzu Corporation, UV-3100).

  The translucent substrate (C) is obtained by molding a translucent material similar to that of the fluorescent light emitting layer (A) into a film shape or a plate shape. Moreover, you may use the glass plate, resin plate, resin film, etc. which are marketed. The thickness may be appropriately set depending on the type of base material to be used, but is usually preferably 0.05 mm to 10 mm. When it is too thick, there is a possibility that light emission is difficult to visually recognize.

Furthermore, it is preferable that the translucent substrate (C) has an uneven shape at least partially (FIG. 2). By having the concavo-convex shape, the fluorescence emission slightly changes between the concave portion and the convex portion, and brightness contrast can be expressed.
In particular, a fluorescent light emitting layer (A) that emits fluorescent light from the side irradiated with ultraviolet rays, a transparent or translucent ultraviolet reflective layer (B) having an ultraviolet reflectance of 10% or more in a wavelength region of 300 nm to 400 nm, and translucency. In the case of a laminate in which the base material (C) is laminated, the above effects are easily obtained. The uneven shape may be a surface in contact with the ultraviolet reflecting layer (B) (FIGS. 2-1 and 2-2) or a surface opposite to the surface in contact with the ultraviolet reflecting layer (B) (see FIG. 2-3) or both sides thereof (FIGS. 2-4). When the surface in contact with the ultraviolet reflective layer (B) has an uneven shape, the thickness of the ultraviolet reflective layer (B) and the fluorescent light emitting layer (A) can be easily changed (FIGS. 2-1 and 2-4). A variety of fluorescence emission with different brightness can be expressed. Moreover, when it has an uneven | corrugated shape in the surface opposite to the surface which contact | connects a fluorescence light emitting layer (A), fluorescence emission changes slightly by a recessed part and a convex part. Furthermore, when it has uneven | corrugated shape on both surfaces of a translucent base material (C), said effect is combined and it can express fantastic light emission, and it is excellent in design nature and aesthetics.

In the concavo-convex shape of the present invention, the difference between the concave and convex portions is preferably about 0.01 mm to 10 mm, more preferably about 0.05 mm to 5 mm. By being in this range, it is possible to express fantastic light emission, and it is excellent in design and aesthetics.

In the laminate of the present invention, a fluorescent light emitting layer ((A) layer) and an ultraviolet reflecting layer ((B) layer) are laminated in order from the side irradiated with ultraviolet rays, and at least one of the above (A) and (B). If the translucent base material (C) ((C) layer) is laminated so as to be in contact with one side, the shape thereof is not particularly limited, such as a plate shape, a prismatic shape, or a cylindrical shape.
Moreover, although the manufacturing method of this invention laminated body is not specifically limited, For example,
(I) A method of laminating an ultraviolet reflective layer (B) and a fluorescent light emitting layer (A) on an optically reflective substrate (C) formed into a plate shape via an adhesive,
(II) A composition for an ultraviolet reflective layer is applied to a translucent substrate (C) formed into a plate shape and cured, and then a composition for a fluorescent light emitting layer is applied on the ultraviolet reflective layer (B). A method of attaching and curing,
(III) The composition for ultraviolet reflective layer is applied to the translucent base material (C) formed into a plate shape and cured, and then the translucent base material on the side opposite to the ultraviolet reflective layer (B) ( C) A method of applying a composition for a fluorescent light emitting layer on the surface and curing it,
Etc.

In the above (I) to (III), when the translucent material, the fluorescent light emitting layer composition, or the ultraviolet reflective layer composition is formed into a film shape, a plate shape, or the like, a known forming method may be used. For example, form molding, injection molding, cast molding and the like can be mentioned.
In the above (II) and (III), when applying the fluorescent light emitting layer composition or the ultraviolet reflective layer composition, means such as spray, roller, trowel, reciprocator, coater, pouring, etc. may be used. it can.

Moreover, at the time of molding, for example, coloring materials, plasticizers, flame retardants, lubricants, preservatives, antifungal agents, antialgae agents, antibacterial agents, dispersants, antifoaming agents, film-forming aids, adsorption agents An agent, a crosslinking agent, an antioxidant, a catalyst, an antiblocking agent and the like may be contained, and such a component can be uniformly mixed by a conventional method to produce a molded product. In particular, when the laminate is irradiated with ultraviolet rays by mixing colorants such as organic pigments, inorganic pigments, dyes, etc., the fluorescent emission of various hues is caused by the synergistic effect of the emission of the colorants and the fluorescent emission layer (A). Can be obtained.

  When laminating the fluorescent light emitting layer (A), the ultraviolet reflective layer (B), and the translucent substrate (C) via an adhesive or the like, a translucent adhesive that does not impair the effects of the present invention, An adhesive, an adhesive tape, etc. can be used. Moreover, although the said fluorescent light emitting layer composition or the composition for ultraviolet reflection layers may be normally dried at normal temperature, it can also be heated.

(Light emitting structure)
In the light emitting structure of the present invention, the ultraviolet light source (D) (light source (D)), the fluorescent light emitting layer (A), the ultraviolet reflective layer (B), and the translucent substrate (C) are laminated. The laminated body is provided. The ultraviolet light source (D) is disposed on the fluorescent light emitting layer (A) side of the laminate (FIG. 3).

The light source (D) may irradiate the entire surface of the (A) layer, or may irradiate locally to form a pattern. A plurality of light sources (D) may be arranged, and the display content can be easily changed by switching the light sources on and off.
Although the light source used for this invention should just emit an ultraviolet light, what has an emission line in the wavelength range of 300 nm-400 nm is preferable.
The direction of viewing the light emission of the light emitting structure is not particularly limited, but when the layer (B) is translucent, it is preferably on the side opposite to the light source (D) to be irradiated. In this case, the shape of the light source installed behind the (A) layer becomes difficult to be visually recognized through the (B) layer.

As described above, an internal-illuminated light-emitting structure is exemplified as a light emission viewing direction opposite to the light source (D) (FIG. 4). In the case of an internally illuminated structure, external leakage of light emitted from the light source (D) can be prevented. In this case, a reflector (E) can be provided behind or on the side of the light source. As such a reflective layer, a coating layer made of a metal material such as Ag, Al, Au, Cr, Cu, Ni, Ti, Pt having a high ultraviolet reflective efficiency, or the ultraviolet reflective layer (B) of the present invention, or Examples include those coated with a white paint containing kaolin, talc, silica, etc., porous plates, porous sheets and the like. The shape of the reflecting plate (E) may be either planar (FIG. 4-1) or wavy (FIGS. 4-2, 4-3). Particularly, in the present invention, a wave shape is preferable, and in this case, it is preferable that the light source is disposed in the concave portion of the reflector. By providing the reflecting plate having such a shape, the light emitted from the light source is irregularly reflected, so that the fluorescent light emitting layer (A) can be irradiated with uniform light. Further, it is preferable that the surface of the reflecting plate has fine irregularities so that the light irregular reflection effect can be further enhanced. The height of the unevenness is preferably 1 to 1000 μm (preferably 5 to 500 μm).

On the other hand, in order to adjust the irradiation intensity near the light source, a shielding plate (F) can be provided between the light source (D) and the fluorescent light emitting layer (A). The shielding plate (F) shields part of the light from the light source (D). Thereby, uniform light can be irradiated by the fluorescent light emitting layer (A).

In the light emitting structure of the present invention, the shape of the light source installed behind the (A) layer is difficult to be visually recognized through the (B) layer as described above. A light-transmitting concavo-convex plate (G) can be disposed through (FIG. 5). By providing such a concavo-convex plate (G), it becomes difficult to visually recognize the shape of the light source installed behind. Furthermore, it can express fantastic light emission of the laminate, and is excellent in design and aesthetics. As an uneven | corrugated board (G), the thing similar to the above-mentioned translucent base material (C) can be used.

  Examples are given below to clarify the features of the present invention.

-Composition 1 for fluorescent light emitting layer
100 parts by weight (solid content) of an acrylic resin emulsion, 10 parts by weight of a green inorganic fluorescent pigment, and 4 parts by weight of additives (dispersing agent, antifoaming agent, etc.) are mixed by a conventional method to prepare a composition 1 for a fluorescent light emitting layer. did.

-Composition 1 for UV reflective layer
100 parts by weight (solid content) of an acrylic resin emulsion, 30 parts by weight of alumina, and 5 parts by weight of additives (dispersant, antifoaming agent, etc.) were mixed by a conventional method to prepare a composition 1 for an ultraviolet reflecting layer.
-Compositions for UV reflective layer 2-6
Based on the composition of Table 1, Compositions 2 to 6 for ultraviolet reflection layer were prepared in the same manner as Composition 1 for ultraviolet reflection layer.
In addition, the raw material used is shown below.
Alumina: particle diameter 1 μm, refractive index 1.76
Barium sulfate: particle size 2 μm, refractive index 1.64
-Heavy calcium carbonate: particle size 1.5 μm, refractive index 1.56
Titanium oxide: particle size 0.25 μm, refractive index 2.71
Zinc oxide: particle diameter 1 μm, refractive index 1.95

The following evaluation was implemented regarding the compositions 1-6 for ultraviolet reflective layers. The results are shown in Table 1.
・ Evaluation 1
Using a test specimen obtained by applying and curing the prepared compositions 1 to 6 for ultraviolet reflective layer on a concealment rate test paper so that the coating thickness is 150 μm (dry film thickness is about 80 μm). The visual reflectance of the black ground coating film and the white ground coating film was measured using a color difference meter ("CR-300": manufactured by Minolta Co., Ltd.) to calculate the concealment rate (%).

・ Evaluation 2
A coating composition in which 20 parts by weight of carbon black is mixed with 100 parts by weight (solid content) of urethane resin on an aluminum plate (40 mm × 40 mm × 0.6 mm) is applied and cured to a coating thickness of 150 μm. Was used as a base material. Reflectivity (%) in a wavelength region of 300 nm to 400 nm using a test specimen coated with an ultraviolet reflective composition 1 on a substrate so that the coating thickness is 150 μm (dry film thickness is about 80 μm) and dried. Was measured with a spectrophotometer ("UV-3100": manufactured by Shimadzu Corporation).
The results are shown in Table 1. As a result, the ultraviolet reflective compositions 1 to 4 had a reflective region in which the ultraviolet reflectance was 10% or more in all regions of the wavelength region of 300 nm to 400 nm. On the other hand, the ultraviolet reflective compositions 5 to 6 had an ultraviolet reflectance of less than 10% in the reflective region. Table 1 shows the ultraviolet reflectance at a wavelength of 365 nm as a representative value.
The reflectance of the substrate at a wavelength of 365 nm was 1.5%.

(Manufacture of laminates)
Example 1
The ultraviolet reflective layer composition 1 is applied to one surface of an acrylic plate (300 mm × 200 mm × 3 mm) with a coating thickness of 150 μm (dry film thickness is about 80 μm), dried, and the ultraviolet reflective layer (B-1 ). Next, the fluorescent light emitting layer composition 1 is applied onto the ultraviolet reflective layer (B-1) so that the coating thickness is 150 μm (the dry film thickness is about 80 μm), dried, and then the fluorescent light emitting layer (A-1). ) To obtain a laminate 1.

  The following evaluation was performed on the obtained laminate 1. The results are shown in Table 2.

・ Evaluation 3
In the laminate 1, an ultraviolet light source (6 W ultraviolet lamp: 365 nm) is installed at a distance of 3 cm from the fluorescent light emitting layer (A-1), irradiated with ultraviolet rays in a dark room, and the emission luminance (cd / m ² ) of the laminate 1. ) Was measured using a color luminance meter “BM-5A” (manufactured by Topcon Corporation). The results are shown in Table 2.

(Example 2)
A laminated body 2 was produced in the same manner as in Example 1 except that the composition 2 for ultraviolet reflection layer was used in place of the composition 1 for ultraviolet reflection layer of Example 1 and the ultraviolet reflection layer (B-2) was laminated. The same evaluation was conducted. The results are shown in Table 2.

(Example 3)
A laminated body 3 was produced in the same manner as in Example 1 except that the composition 3 for ultraviolet reflection layer was used in place of the composition 1 for ultraviolet reflection layer of Example 1 and an ultraviolet reflection layer (B-3) was laminated. The same evaluation was conducted. The results are shown in Table 2.

Example 4
A laminated body 4 was produced in the same manner as in Example 1 except that the composition 4 for ultraviolet reflection layer was used in place of the composition 1 for ultraviolet reflection layer of Example 1 and the ultraviolet reflection layer (B-4) was laminated. The same evaluation was conducted. The results are shown in Table 2.

(Example 5)
A laminate 5 was produced in the same manner as in Example 1 except that the ultraviolet reflective layer (B-5) was laminated in place of the application thickness of the composition 1 for ultraviolet reflective layer 1 of Example 1 at 250 μm, and the same evaluation was made. Carried out. The results are shown in Table 2.

(Comparative Example 1)
A laminated body 6 is produced in the same manner as in Example 1 except that the composition 5 for ultraviolet reflection layer is used in place of the composition 1 for ultraviolet reflection layer of Example 1 and an ultraviolet reflection layer (B-6) is laminated. The same evaluation was conducted. The results are shown in Table 2.

(Comparative Example 2)
A laminated body 7 is produced in the same manner as in Example 1, except that the composition 6 for ultraviolet reflecting layer is used in place of the composition 1 for ultraviolet reflecting layer of Example 1 and the ultraviolet reflecting layer (B-7) is laminated. The same evaluation was conducted. The results are shown in Table 2.

(blank)
On one surface of an acrylic plate (300 mm × 200 mm × 3 mm), the fluorescent light emitting layer composition 1 is applied to a thickness of 150 μm (dry film thickness is about 80 μm) and dried to obtain a fluorescent light emitting layer (A -1) was used as a blank for evaluation 3 of the above-mentioned Examples and Comparative Examples.

(Example 6)
Before coating and drying, the composition 1 for an ultraviolet reflective layer is applied to an uneven surface of an acrylic plate having random unevenness on one side (maximum difference between concave and convex portions of 200 μm) to a thickness of about 250 μm. The surface of the substrate was ground using a rubber spatula and coated so that the coating thickness of the composition for ultraviolet reflection layer was increased in the concave portion of the substrate, dried, and the ultraviolet reflection layer (B-1) was laminated. Next, the composition for fluorescent light emitting layer 1 is uniformly applied on the ultraviolet reflective layer (B-1) so that the coating thickness is about 150 μm, dried, and the fluorescent light emitting layer (A-1) is laminated. A laminate 8 was obtained.
With respect to the obtained laminate 8, an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet rays in a dark room. A weak light emission was observed, and a complicated light emission pattern corresponding to the uneven pattern of the substrate was observed.

(Example 7)
The UV reflective layer composition 1 is uniformly applied to a smooth surface of an acrylic plate having random irregularities (maximum difference between concave and convex portions of 200 μm) on one side so that the thickness is about 150 μm, dried, and then exposed to ultraviolet rays. A reflective layer (B-1) was laminated. Next, the fluorescent light emitting layer composition 1 is applied on the ultraviolet reflective layer (B-1) so that the coating thickness is about 150 μm, and dried to laminate the fluorescent light emitting layer (A-1). Got.
With respect to the obtained laminate 9, an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet rays in a dark room. The light emitted from the side was refracted, and a complex light emission pattern was observed.

(Example 8)
Apply the UV reflective layer composition 1 uniformly on the uneven surface of an acrylic plate having random unevenness on one side (maximum difference between concave and convex portions of 200 μm) so that the thickness is about 150 μm, and dry. An ultraviolet reflective layer (B-1) was laminated. Next, the fluorescent light emitting layer composition 1 is uniformly applied on the ultraviolet reflective layer (B-1) so that the thickness is about 200 μm, and the substrate surface is ground using a rubber spatula before drying. Coating was performed so that the coating thickness of the composition for fluorescent light emitting layer 1 was thickened at the substrate recess, and drying was performed to laminate the fluorescent light emitting layer (A-1), whereby a laminate 10 was obtained.
Regarding the obtained laminate 10, an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet rays in a dark room. A weak light emission was observed, and a complicated light emission pattern corresponding to the uneven pattern of the substrate was observed.

Example 9
After applying the UV reflective layer composition 1 on one side of an acrylic plate having random irregularities (maximum difference between concave and convex parts of 200 μm) on both sides to a thickness of about 250 μm, and before drying, The surface of the substrate was ground using, and the substrate was coated so that the coating thickness of the composition 1 for ultraviolet reflection layer was increased in the concave portion of the substrate, dried, and the ultraviolet reflection layer (B-1) was laminated. Next, the composition for fluorescent light emitting layer 1 is uniformly applied on the ultraviolet reflective layer (B-1) so that the coating thickness is about 150 μm, dried, and the fluorescent light emitting layer (A-1) is laminated. A laminate 11 was obtained.
With respect to the obtained laminate 11, an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet rays in a dark room. The light emitted from the back side was refracted by the unevenness of the substrate surface, and a very complicated light emission pattern was recognized.

(Example 10)
An acrylic resin cylinder having an outer shape of 9 cm and an inner diameter of 8 cm having line-shaped irregularities (maximum difference between concave and convex portions of 200 μm) on both the inner surface and the outer surface is used as a base material, and the composition for ultraviolet light reflecting layer 1 is applied to the inner surface. The coating was uniformly applied to a thickness of about 150 μm, dried, and an ultraviolet reflective layer (B-1) was laminated. Next, the fluorescent light emitting layer composition 1 is applied on the ultraviolet reflective layer (B-1) so that the coating thickness is about 450 μm, and the substrate surface is ground before drying with a rod-like spatula. And it apply | coated so that the coating thickness of the composition 1 for fluorescent light emitting layers might become thick by a base material recessed part, it dried and laminated | stacked the fluorescent light emitting layer (A-1), and produced the cylindrical laminated body 12. FIG.
When a 10 W black light fluorescent lamp was installed inside the obtained cylindrical laminate 12 and irradiated with ultraviolet rays, the concave portion on the inner surface of the base material showed strong light emission and the convex portion showed weak light emission. As a result, the light emitted from the back side was refracted, and a very complicated light emission pattern was observed.

(Comparative Example 3)
Before coating and drying, the composition 5 for UV reflective layer is applied to the uneven surface of an acrylic plate having random unevenness on one side (maximum difference 200 μm between the concave and convex portions), and the thickness is about 250 μm. The surface of the base material was ground using a rubber spatula, applied to the concave portion of the base material so that the coating thickness of the composition 5 for ultraviolet reflecting layer was increased, dried, and laminated with an ultraviolet reflecting layer (B-5). Next, the fluorescent light emitting layer composition 1 is uniformly applied on the ultraviolet reflecting layer (B-5) so that the coating thickness is about 150 μm and dried to laminate the fluorescent light emitting layer (A-1). Body 13 was obtained.
With respect to the obtained laminate 13, an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet rays in a dark room. Both showed weak emission, and the emission pattern was difficult to distinguish.

(Example 11)
Using the laminate 2 of Example 2, an internally-illuminated light emitting structure shown in FIG. When an ultraviolet light source (6W ultraviolet lamp: 365 nm) was installed at a distance of 3 cm from the fluorescent light emitting layer (A-1) and irradiated with ultraviolet light, the fluorescent light emitting layer (A-1) showed uniform light emission.

(A) Viewing direction (direction of light emission)
(A) Fluorescent light emitting layer (B) Ultraviolet reflective layer (C) Translucent substrate (D) Light source (E) Reflector (F) Shield plate (G) Translucent uneven substrate (H) Air layer

Claims (3)

A laminate that emits light by irradiation with an ultraviolet light source, and a light emitting structure including an ultraviolet light source,
The laminate is a transparent or semi-transparent ultraviolet reflective layer having a fluorescent light emitting layer (A) exhibiting fluorescent light emission from the side irradiated with ultraviolet light, and having an ultraviolet reflectance of 10% or more in the entire wavelength region of 300 nm to 400 nm. (B) is laminated,
Furthermore, the translucent substrate (C) is laminated so as to be in contact with at least one of the above (A) and (B),
An ultraviolet light source (D) is provided on the fluorescent light emitting layer (A) side of the laminate ,
The ultraviolet light reflecting layer (B) contains an ultraviolet reflective powder having a particle diameter of 0.4 μm or more and 10 μm or less and a light transmitting material, and has a thickness of 0.01 mm to 10 mm.   The laminate is a transparent or semi-transparent ultraviolet reflective layer having a fluorescent light emitting layer (A) exhibiting fluorescent light emission from the side irradiated with ultraviolet light, and having an ultraviolet reflectance of 10% or more in the entire wavelength region of 300 nm to 400 nm. The light emitting structure according to claim 1, wherein (B) and a translucent substrate (C) are laminated. The light-transmitting substrate according to any one of claims 1 to 2, wherein the translucent substrate (C) has an uneven shape at least partially.

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