JP2960705B2 - Eyeglass parts and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to spectacles, and more particularly, to spectacle parts which can be easily adapted to skin and provide spectacles having excellent wearability.

[0002]

2. Description of the Related Art At present, various developments have been made on the material, structure, etc., of a spectacle frame having an excellent wearing feeling. In particular, the frame material that directly touches the skin greatly affects the quality of the mountability depending on how the material is selected.
For example, cellulosic resins have been conventionally used for spectacles because of their excellent transparency, flexibility (hardness to break), and processability, and also because they have appropriate hygroscopicity.

[0003] However, this cellulosic resin has the same drawbacks as other resins, for example, when it is brought into direct contact with the skin, a smooth soft feeling cannot be obtained. For this reason, a technology for pursuing a soft touch to the cellulosic resin frame material has been developed.

For example, according to Japanese Patent Application Laid-Open No. 6-175086, a two-part urethane paint in which finely divided collagen fibers are uniformly dispersed is coated on an acetate pad to form a surface layer containing finely divided natural leather fibers. A method for obtaining a pad having a texture is disclosed. The pat portion made by this method is very useful because it has a smooth and soft touch like natural leather, has a good wearing feeling, and has no stickiness due to perspiration. However, in this method, if the thickness of the surface layer or the size of the finely divided natural leather fiber is incorrectly selected, these effects are not produced at all.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to always and surely provide a spectacle part having a smooth, soft touch and an excellent wearing feeling as a spectacle part.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies on such problems, and as a result,
When the size of the protein fine powder and the thickness of the surface layer are limited to a certain range, it has been found that various properties including a smooth and soft touch can be reliably obtained, and the present invention has been completed based on this finding. .

That is, the present invention provides (1) eyeglasses
A part, wherein the part is made of cellulose propionate.
Urea including a substrate and protein formed on the surface of the substrate
Consisting of a surface layer of a tin resin, wherein the layer thickness of the surface layer is 40 to
It is present in eyeglass parts in the range of 100 μm .

[0008] (2) The components constituting the glasses
Thus, the component is a cellulose propionate substrate and the
Urethane resin containing protein formed on the surface of the substrate
Particles having a surface layer of
It is in eyeglass parts consisting of diameters .

[0009] Also, (3) the parts constituting the glasses
Wherein the component is made of a cellulose propionate substrate
And urethane containing protein formed on the surface of the substrate
It consists of a resin surface layer, and the content of the protein is
It is present in eyeglass parts which is 15 to 35% by weight of the tan resin .

[0010] Also, (4) the parts constituting the spectacles
Wherein the component is made of a cellulose propionate substrate
And urethane containing protein formed on the surface of the substrate
It consists of a resin surface layer, and the water absorption of the base material is 1 to 3%.
In the eyeglass parts that are in the range .

And (5) a component constituting eyeglasses, the component comprising a base material of cellulose propionate and a surface layer of a urethane resin containing protein formed on the surface of the base material; The thickness of the surface layer is 40 to 100 μm
In which the protein has a particle size of 10 μm or less and the water absorption of the substrate is in the range of 1 to 3%.

(6) a step of roughly polishing the surface of a cellulose propionate substrate molded into eyeglass parts; and a two-part curing type containing a protein on the surface of the substrate. The present invention provides a method for manufacturing a component for eyeglasses, comprising: a step of coating a urethane resin paint to form a surface layer; and a step of accelerating the curing of urethane in a temperature environment of 60 ° C. or lower.

[0013] (7) The method according to (6 ) , wherein the thickness of the surface layer formed by the coating is in the range of 40 to 100 µm.

Also, (8), 1 as a protein
The above (6) using a powder having a particle size of 0 μm or less.
In the manufacturing method of eyeglass parts.

Further , (9) the method for producing eyeglass parts according to the above (6 ), wherein the content of the protein is 15 to 35% by weight of the urethane resin.

[0016]

[0017]

[0018]

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an eyeglass component and a method of manufacturing the same according to the present invention will be described below with reference to the drawings. In general, as shown in FIG. 1, the spectacles 1 include metal or plastic spectacle frames and lenses, and the spectacle frames include, for example, a front part 2, pads 3, temples 4, and end pieces 5. . Here, an example in which the present invention is applied to an end piece 5 which is one of eyeglass parts is shown.

FIG. 2 is a diagram schematically showing an example of the composition structure of the surface of the eyeglass component (eg, the end piece 5) according to the present invention.

Here, the substrate 1 of the end piece 5 of the present invention
As 0, a cellulose resin is used. Generally, the cellulose resin includes cellulose acetate (so-called acetate resin), cellulose butyrate, and cellulose propionate (CP). Among them, the first cellulose acetate cannot maintain a strong adhesion surface at the interface because the plasticizer contained in the resin bleeds at the interface with the protein-containing layer.

In the case of the second cellulose butyrate, the unpleasant odor emitted from the resin is not suitable as a part for eyeglasses used in contact with the head. For this reason, in the present invention, among the cellulosic resins,
A third cellulose propionate (CP) is preferably employed.

Here, the thickness of the surface layer 11 is 4
A range of 0 to 100 μm is suitably adopted. The surface layer provided on a base material having a small thickness, such as eyeglass parts, has a limit in its thickness and, as described later, is also limited in relation to the particle size of the protein. Generally, in the case of a spray paint (solvent-type paint) suitable as a colored coating material for eyeglass members, the paint is applied at 20 to 50 μm.

However, the surface layer containing the protein
A layer thickness of 40 μm or more is required to obtain the flexible surface state. That is, if the layer thickness is smaller than 40 μm, the roughness of the base material cannot be covered, and the softness is lacking, and it is difficult to obtain a good wearing feeling. If it is larger than 100 μm, it is not preferable for the following reasons.

That is, if an attempt is made to obtain a layer thickness of 100 μm or more by a single spray, dripping of the spray paint occurs. Therefore, after spraying, it is necessary to repeat the operation of once leaving at room temperature to volatilize the thinner and spray again. As a result, to obtain a layer thickness of 100 μm or more, 3
The above-mentioned repetition operation is required more than twice, and the surface layer is likely to be uneven. Further, the time required for painting is greatly increased, and the painting cost is increased.

In the present invention, the content of the protein relative to the polyurethane is from 15 to 35% by weight. If the protein content is less than 15% by weight, it may not be sufficiently exposed on the surface of the polyurethane, and 35% by weight.
If the number is larger, cracks tend to be generated due to deformation such as bending. In the present invention, the urethane surface layer containing protein, which is a surface layer formed on the surface of the CP base material, is in a state where protein, which is a porous substance, is exposed on the surface of the layer.

That is, as shown in FIG. 2, in the urethane surface layer 11 containing the protein 12, fine irregularities are formed on the surface, and the surface area is large. Originally, urethane resin has high water absorption, and if the surface area is increased in this way, the water absorption becomes better. And the porous protein protruding from the surface further increases the water absorption rate. As a result, the stickiness at the time of sweating is eliminated, and the sliding of the frame is suppressed. By the way, it is also important that the base material has a predetermined absolute water absorption in order to suppress slippage when wearing spectacles.

This is because the larger the absolute water absorption, the more easily the substrate absorbs moisture at ordinary room temperature.
When a urethane surface layer containing protein is present on a substrate having a high water absorption, if the amount of water absorbed by the surface layer increases, the urethane surface layer can easily penetrate and migrate to the CP substrate. Therefore, even when the protein-containing layer contains excessive moisture, the moisture migrates toward the CP base material, and the surface layer does not stick, thereby preventing, for example, slipping of the glasses during perspiration. Then, when the moisture transferred to the base material is dried, it is released to the outside air via the surface layer.

FIG. 3 is a diagram showing the amount of water absorption as a function of time (the surface layer is a urethane layer containing 10% by weight of protein and the layer thickness is 50 μm). It will be understood that the CP base material having the urethane surface layer containing protein or a single CP base material has a much higher water absorption than other resin materials and the like. For example, a CP substrate having a protein-containing urethane surface layer or a single CP substrate is an ABC substrate having a protein-containing urethane surface layer or a single ABC substrate, and a nylon having a protein-containing urethane surface layer. It shows a water absorption of twice or more (around 200 MIN) as compared with the substrate or a single nylon substrate.

Incidentally, a substrate having a urethane surface layer containing a protein has a higher initial water absorption than a single substrate due to the high water absorption of the surface layer. As described above, in order to prevent the glasses from slipping due to slippage during sweating, it is effective to employ a CP base material having excellent water absorbency. From the above, as described above, in the eyeglass component of the present invention, by undergoing two moisture absorption processes,
It can be seen that the harmful effects of sweating can be eliminated and the skin becomes easily adaptable.

That is, in the urethane surface layer containing protein, since the protein, which is a porous substance, is exposed on the surface of the layer, minute projections and depressions are formed and the surface area is increased. Therefore, the water absorption of the surface layer is extremely improved, the stickiness due to perspiration is eliminated, and slipping of the glasses can be prevented. Next, the moisture absorbed in the surface layer can also more easily permeate and migrate into the CP base material.

Here, in the eyeglass part of the present invention, C
As for the water absorption of the P base material, the water absorption is in the range of 1 to 3%, preferably 1.3 to 2.8%. Water absorption rate is 1
% Or less, moisture cannot be sufficiently transferred from the surface layer to the substrate during perspiration, and if it is 3% or more, sufficient adhesion between the substrate and the protein-containing surface layer cannot be obtained.

Here, the water absorption is a value measured as follows. A plastic piece (substrate) molded to a volume of 5.1 cm ³ and a surface area of 4.3 cm ² was weighed and immersed in distilled water at 25 ° C. for a specified time (24 hours). Thereafter, the plastic piece was pulled up, the water adhering to the surface was removed by air blowing, weighed again, and the water absorption was calculated from the weight difference before and after immersion.

According to the present invention, the surface layer has a thickness of 40 to 1
In order to obtain a coat having a soft feeling of 00 μm, the particle size of the protein powder is preferably about 10 μm or less. If it is larger, the protein powder will protrude too much from the surface layer, and the surface state will not be soft.

Next, the method for manufacturing the eyeglass component of the present invention will be described. The eyeglass part is manufactured by passing through the following steps. [I] First, in order to improve the bonding between the surface layer containing the protein and the plastic CP base material, the surface of the CP base material 10 formed into an eyeglass component is roughly polished (polishing step).

As this polishing method, a normal polishing method is employed, but rough polishing using a barrel is particularly preferable. In the rough polishing using the barrel, two polishing processes, a rough barrel polishing process and a middle barrel polishing process, are performed. Here, the processing roughness (JISB
0601) preferably employs a range of Ra: 0.25 μm to 0.65 μm. If it is 0.25 μm or less, the adhesion to the surface layer is not sufficient, and if it is 0.65 μm or more, the abrasive remains on the substrate surface.

[II] After polishing the surface of the CP base material 10,
A surface layer of a urethane resin containing protein is formed on the surface of the CP base material 10 (surface layer forming step). Here, appropriate coating film physical properties such as water resistance and abrasion resistance of the surface layer (especially when used as a temple, the abrasion resistance is required because of a lot of contact with hair) are required. If an unreacted urethane paint is used to form the surface layer, problems remain in the above-mentioned physical properties.

When a one-pack type urethane paint is used, a curing agent whose reaction start temperature is set high is already mixed therein, so that it is necessary to raise the curing temperature. Eyeglass parts such as CP base materials that require flexibility have low thermal deformation temperatures (60 to 80 ° C.), and thus cause thermal deformation. Therefore, it is preferable to employ a two-component curable urethane paint for the protein-containing urethane surface layer used for forming the surface layer.

[II] After the surface layer is formed, the urethane resin of the surface layer is accelerated in curing (surface layer curing step). Curing of the urethane resin is preferably performed in a constant temperature room at 60 ° C. or lower under a temperature environment. When the temperature is 60 ° C. or higher, the CP base material is easily deformed by heat.

[0040]

Next, specific embodiments of the present invention will be described. [Example 1] An end piece was molded from cellulose propionate (manufactured by Kodak), and rough barrel polishing was performed for 20 hours.
The medium barrel polishing was performed for 20 hours to process the rough surface.
Here, the processing roughness in the rough barrel polishing (JISB060
1): Ra: 0.7374 μm, Ry: 7.0496
μm. In addition, the processing roughness (J
ISB0601) is Ra: 0.3057 μm, Ry:
It was 2.7846 μm. In the following examples and comparative examples, processing is performed to approximately the processing roughness described above. Then, 2 containing 20% by weight of protein powder (particle size: 5 μm)
A liquid urethane paint Mateilo (manufactured by Idemitsu Chemical Co., Ltd.) was applied to a thickness of 50 μm to obtain an end piece having a soft touch. As a result, an end piece with a soft touch was obtained.

Example 2 A pad was formed with cellulose propionate (manufactured by Kodak Co., Ltd.), and rough barrel polishing was performed for 20 hours and medium barrel polishing was performed for 22 hours to process a rough surface. After molding, protein powder (particle size 8μm)
A two-part urethane paint Mateilo (manufactured by Idemitsu Chemical Co., Ltd.) containing 20% by weight was applied to a thickness of 80 μm. As a result, a soft touch pad was obtained. FIG. 4 shows the electron micrograph.

Example 3 A front molded with cellulose propionate (manufactured by Kodak Co., Ltd.) was subjected to rough barrel rough polishing for 20 hours and medium barrel polishing for 20 hours to process a rough surface. After the molding, a two-part urethane paint Matiro (manufactured by Idemitsu Chemical Co., Ltd.) containing 30% by weight of protein powder (particle size: 5 μm) was applied to the front to a thickness of 80 μm. As a result, the front with a soft touch was obtained.

[Comparative Example 1] A sheet formed of cellulose propionate (manufactured by Kodak Co., Ltd.) was cut into end pieces, punched, and then subjected to rough barrel polishing.
For 0 hour, medium barrel polishing was performed for 20 hours to process the rough surface. After that, protein powder (particle size 20 μm) 2
A two-part urethane paint Matiro II (manufactured by Idemitsu Chemical Co., Ltd.) containing 0% by weight was applied to a thickness of 50 μm. As a result, an end piece having a rough surface was obtained.

Comparative Example 2 A pad was molded with cellulose propionate (manufactured by Kodak Co., Ltd.), and the nose contacting part was processed to a rough surface by sandblasting (with the same roughness as in Example 2). did). After processing, a two-part curable urethane paint Mateilo I (manufactured by Idemitsu Chemical Co., Ltd.) containing 20% by weight of protein powder (particle diameter: 8 μm) was added to a powder of 20 μm.
m thickness. As a result, the pad was slightly lacking in softness. FIG. 5 shows an electron micrograph thereof.

Comparative Example 3 A front molded with cellulose propionate (manufactured by Kodak Co., Ltd.) was processed into a rough surface by performing barrel rough polishing for 20 hours and medium polishing for 20 hours. After polishing, a two-part urethane paint Mateilo ST (manufactured by Idemitsu Chemical Co., Ltd.) containing 50% by weight of protein powder (particle size: 5 μm) was applied to the front to a thickness of 80 μm. As a result, fine cracks occurred in the paint when the front was bent.

Comparative Example 4 A front molded with cellulose propionate (manufactured by Kodak Co., Ltd.) was processed into a rough surface by performing barrel rough polishing for 20 hours and medium polishing for 20 hours. After the polishing, a two-part urethane paint Mateilo ST (manufactured by Idemitsu Chemical Co., Ltd.) containing 20% by weight of protein powder (particle size: 5 μm) was applied to the front to a thickness of 120 μm. As a result, a soft-textured front was obtained, but a spray drying step was required four times to form a layer, and the surface layer was slightly uneven.

Using the spectacles provided with the spectacle parts manufactured in the above Examples and Comparative Examples, the results of a paneling test on the thickness of the surface layer and the production cost (coating cost) are shown below. It is shown in Table 1.

[0048]

[Table 1]

As is clear from the results of the paneling test shown in Table 1, the surface layer 11 of the protein coat was used.
When the layer thickness is in the range of 40 to 100 μm, a good wearing feeling is obtained, and an excellent effect as a part for eyeglasses is exhibited.

Although the present invention has been described above, the present invention is not limited only to the embodiment, and it goes without saying that other various modifications are possible without departing from the essence thereof. In addition, the present invention can be effectively applied not only to eyeglass parts but also to, for example, small articles that are used in contact with the skin, and the same operation as the above embodiment can be obtained.

[0051]

As described above, according to the present invention, an excellent soft touch can be obtained with this type of eyeglass part. In addition, the urethane surface layer containing protein is excellent in absorbing and releasing properties, and can suppress moisture interposed between the base material and the skin due to sweat when wearing spectacles, thereby preventing slippage. Further, the surface area of the urethane surface layer is increased by the minute projections and depressions formed by the protein particles, and the water absorption is further improved. The moisture absorbed in the surface layer can also permeate and migrate toward the cellulose propionate substrate. As a result, by going through such two water absorption processes, the adverse effect of stickiness due to perspiration can be eliminated, and the skin becomes easily adapted to the skin.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of eyeglasses according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a composition structure of the eyeglass component according to the present invention.

FIG. 3 is a diagram showing the water absorption characteristics of the base material of the eyeglass component according to the present invention.

FIG. 4 shows an electron micrograph of Example 2.

FIG. 5 shows an electron micrograph of Comparative Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glasses 2 ... Front part 3 ... Pad 4 ... Temple 5 ... End piece 10 ... Base material 11 ... Surface layer 12 ... Protein

Claims (9)

(57) [Claims] Claims: 1. A part of an eyeglass, comprising :
A substrate made of cellulose propionate and formed on the surface of the substrate
From the surface layer of the urethane resin containing protein
And the thickness of the surface layer is in the range of 40 to 100 μm.
Eyeglass parts characterized by the above-mentioned. 2. A part constituting eyeglasses, wherein said part is
A substrate made of cellulose propionate and formed on the surface of the substrate
From the surface layer of the urethane resin containing protein
The protein has a particle size of 10 μm or less.
Eyeglass parts characterized by the above-mentioned. 3. A component constituting eyeglasses, wherein the component is
A substrate made of cellulose propionate and formed on the surface of the substrate
From the surface layer of the urethane resin containing protein
And the content of the protein is 15 to 3 of the urethane resin.
An eyeglass part characterized by being 5% by weight. 4. A part constituting eyeglasses, wherein said part is
A substrate made of cellulose propionate and formed on the surface of the substrate
From the surface layer of the urethane resin containing protein
That the water absorption of the substrate is in the range of 1 to 3%.
Characteristic eyeglass parts. 5. A component constituting eyeglasses, wherein the component comprises a cellulose propionate substrate and a surface layer of a urethane resin containing protein formed on the surface of the substrate, and the thickness of the surface layer Is in the range of 40 to 100 μm, the protein has a particle size of 10 μm or less, and the water absorption of the substrate is in the range of 1 to 3%. 6. Coating the step of polishing roughen the surface of the parts are molded cellulose propionate made base material for spectacles, the two-component curing type urethane resin paint containing proteins on the surface of the substrate A method of forming a surface layer, and a step of accelerating the curing of urethane in a temperature environment of 60 ° C. or lower. 7. A method of manufacturing an eyeglass component according to claim 6, wherein the thickness of the surface layer formed by the coating is in the range of 40 to 100 [mu] m. 8. The method for producing eyeglass parts according to claim 6 , wherein powder having a particle size of 10 μm or less is used as the protein. 9. The urethane resin according to claim 1, wherein the content of the protein is
The method according to claim 6 , wherein the content is 5 to 35% by weight.