JPH07168142A - Spectacle plastic dyed lens - Google Patents

Abstract

PURPOSE:To obtain a lens having excellent adhesion property and marring resistance and improved in impact resistance and decolorization property in color development by arranging an impact absorbing layer only on the side of R2 face (eye side). CONSTITUTION:This spectacle plastic dyed lens is provided with a dyed plastic lens base material, the impact absorbing layer arranged on the R2 face, a marring resistant layer and a reflection preventive layer successively arranged thereon, a marring resistant layer arranged on the R1 face of the base material and a reflection protective layer arranged thereon. That is, the impact absorbing layer is arranged only on the R2 face side (eye side). As the material constituting the impact absorbing layer, an acrylic resin coating material, vinyl acetate and vinyl alcohol resin coating material are exemplified. As a materail constituting the marring resistant layer arranged on the impact absorbing layer, a silicone resin, acrylic resin or the like having highly three-dimensional netlike structure are exemplified. As a material used for forming the reflection preventive layer, metal and the oxide of metal or metalloid are exemplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic dyed lens for spectacles, which is excellent in adhesion of coating film, scratch resistance, chemical resistance, weather resistance and antireflection property, and particularly excellent in color fastness of dyeing. It is a thing.

[0002]

2. Description of the Related Art In recent years, plastics, which are lighter and easier to dye than glass, have attracted attention as materials for eyeglass lenses, and many plastic lenses having high refractive index and low chromatic aberration have been provided. In general, this plastic lens has the drawback of being extremely vulnerable to scratches, so it is usually a hard-coded film on the lens surface, or an anti-reflection coating with an inorganic substance deposited for the purpose of preventing flickering and ghosts due to surface reflection. It is provided with the membrane provided.

However, a hard coat film, that is, a plastic lens provided with both a scratch resistant layer and an antireflection film is more durable than a plastic lens provided with no film or a plastic lens provided with only a scratch resistant layer. Due to the drawback of significantly poor impact resistance, solutions to this problem are being investigated from multiple angles. Against this background, for example, a spectacle lens in which a shock absorbing layer is provided on both surfaces of the lens for the purpose of improving the impact resistance by improving the adhesion between the lens substrate and the hard coat film scratch-resistant layer. Is proposed.

However, in the case of the proposed plastic lens, although the adhesion between the lens substrate and the hard coat film is improved, in the case of the dyed lens, the impact absorption layer is present, There is a problem that color loss is large as compared with a lens in which a shock absorbing layer is not provided.

[0005]

DISCLOSURE OF THE INVENTION The inventors of the present invention have earnestly studied for the purpose of providing a plastic lens having excellent color-detachment resistance and impact resistance. When a shock-absorbing layer is provided, the degree of decolorization of the dyed lens is better than when a shock-absorbing layer is provided on both sides, and there is not much difference from the case where no shock-absorbing layer is provided. It is important to reduce the tensile stress generated at the interface between the R2 surface side (eyepiece side) of the lens base material and the scratch resistant layer, and therefore the R2 surface lens base material and the scratch resistance are important. It is effective to provide a shock absorbing layer between the layers, that is, the shock absorbing layer has almost no effect when it is provided only on the R1 surface (object side), and when it is provided only on the R2 surface, Shock absorbing layers on both R1 and R2 surfaces It has been found that there is the same effect as in the case digits.

The present invention has been made on the basis of the above-mentioned findings, and it is stated that "a dyed plastic lens base material, a shock absorbing layer provided on the R2 surface of the plastic lens base material, and a shock absorbing layer provided thereon are sequentially arranged. "A plastic stained lens for spectacles having a scratch resistant layer and an antireflection layer provided thereon, a scratch resistant layer provided on the R1 surface of the base material, and an antireflection layer provided thereon." provide.

[0007]

In the present invention, since the impact absorbing layer is provided only on the R2 surface side (eyepiece side) as described above, good adhesion and scratch resistance as well as impact resistance are improved, and color development A plastic dyed lens with improved color removal is realized. Further, in the case of the present invention, it is essential to dispose the impact absorbing layer at a specific position in order to realize a remarkable effect.

In this case, the type of the plastic lens substrate is not particularly limited, but the liquid curable compound has a benzene ring, a naphthalene ring, a carbonate bond, a urethane bond, or a halogen element in its main chain and / or side chain. A plastic lens having at least one of the above is particularly preferably used. The polymerization method for manufacturing this lens is almost the same as the polymerization method for ordinary plastic lenses,
Pour the monomer mixture into a mold assembled with a glass mold and an ethylene-vinyl acetate copolymer gasket, heat at a predetermined temperature for a predetermined time, and after removing from the glass mold, post cure at a predetermined temperature for a predetermined time. A plastic lens substrate is obtained by the above.

For the dyed plastic lens substrate, the dye aqueous solution in which the dye and the surfactant are appropriately mixed and dispersed is maintained at about 90 ° C., and the mixture is put in a cylindrical or rectangular dyeing tank and stirred. In general, a method in which a plastic lens substrate is placed and dipped in the dyeing method is used, but the dyeing method itself is not particularly limited.

As a material constituting the shock absorbing layer applied only to the R2 surface, generally, the adhesion between the lens substrate and the upper scratch-resistant layer is good, and the energy given by the shock is absorbed. Any kind of resin can be used as long as it is a resin coating film having sufficient elasticity.

Specific examples of the material forming the shock absorbing layer include acrylic acid resin paints, vinyl acetate and vinyl alcohol resin paints, nitrogen-containing vinyl polymer resins, amino resin paints, polyester resin paints. , Polyamide resin coatings, silicone resin coatings, polyurethane resin coatings, epoxy resin coatings, fibrous resin coatings and mixtures or copolymer coatings thereof, or partially modified various resin coatings, etc. .

These shock absorbing layers are diluted with a solvent and applied to the lens substrate. Examples of the solvent used for dilution include alcohols, ketones, esters,
Examples thereof include ethers, and various other known solvents can be used. Particularly preferred are methanol, ethyl cellosolve, and methyl ethyl ketone, but these may be used alone or as a mixed solvent of two or more kinds.

Further, in these impact absorbing layers, if necessary, a curing catalyst for promoting curing, an ultraviolet absorber for improving weather resistance, and an antioxidant for preventing heat deterioration. It is also possible to appropriately add additives such as pigments, dyes and photochromic materials for the purpose of coloring, and further paint additives such as surfactants for obtaining a good coating film.

As a method for coating the shock absorbing layer, any known method such as spin coating or dipping can be used without particular limitation. It is also effective to subject the lens to pretreatment such as alkali treatment, plasma treatment, and ultraviolet treatment, if necessary. Thickness of shock absorbing layer is 0.05
˜5 μm, preferably 0.1˜3 μm. When the film thickness is less than 0.05 μm, the shock absorbing layer cannot sufficiently play a role, and when it exceeds 5 μm, scratch resistance, heat resistance and the like are remarkably deteriorated. The shock absorbing layer is
For example, a uniform coating can be formed by applying an appropriate coating material as described above and solidifying or curing by a method such as natural standing, heat curing, photo-curing, electron beam curing or the like.

As a material for the scratch resistant layer disposed on the shock absorbing layer, a silicone resin, an acrylic resin, a melamine resin having a highly three-dimensional network structure can be used. is there. The scratch-resistant layer is formed on both the R1 surface and the R2 surface by using a generally used coating method, similarly to the impact absorption layer. For the curing treatment after coating, various curing means such as heat curing, ultraviolet curing and electron beam curing can be adopted.

In the present invention, the antireflection layer is provided on the scratch-resistant layer on both the R1 surface and the R2 surface. As a substance used for forming the antireflection layer, a metal,
Examples thereof include metal or metalloid oxides and fluorides.
Various methods such as a vacuum vapor deposition method, a sputtering method, an ion plating method, and an ion beam assist method can be cited as the method for forming the single-layer or multi-layer antireflection layer.

[0017]

The present invention will be described in more detail with reference to the following examples. Of course, the present invention is not limited to the examples shown below. The performance of the plastic lens was evaluated by the following method. 1) Adhesion of film A crosshatch tape test was performed to evaluate the adhesion of the film. That is, the surface of the lens having a wave film on the surface is cut with a cutter to cut a 1 mm square goggles (100 squares), and after sticking cellophane tape on it,
The tape was repeatedly peeled off ten times, and the number of burrs in the film remaining without being peeled from the lens was counted. Then, the result is expressed as "X / 100". "100/100" indicates that the film did not peel at all as a result of the crosshatch tape test. 2) Scratch resistance Steel wool # 1000 manufactured by Nippon Steel Wool Co., Ltd.
The surface of the lens was rubbed against scratches and the scratch resistance was examined, and the judgment was made as follows.

A: No scratch even with strong rubbing B: Some scratches with strong rubbing C: Scratch with weak rubbing 3) Impact resistance Evaluation was made by a hard ball falling ball test. Twelve 16.2g hard spheres
The lens was naturally dropped from a height of 7 cm toward the center of the lens, and the number of impacts before the fracture was taken as the impact resistance of the lens. 4) Color Loss The color loss when a shock absorbing layer and a scratch resistant layer were applied to a substrate-dyed lens was evaluated. Shock absorbing layer on dyed lens,
The color difference (according to the Hunter color difference method) was measured before applying the scratch resistant layer and after applying the impact absorbing layer and the scratch resistant layer.

The adhesion, scratch resistance, and impact resistance tests of the film were conducted on a lens sample provided with all of the shock absorbing layer, scratch resistant layer, and antireflection layer. Example 1 (1) Plastic dyed lens base material A general eyeglass plastic lens base material such as allyl diglycol carbonate (CR39) was used, and a brown dye (Nikon light) was used for dyeing, and the transmittance was 50%. And (2) Preparation of composition for impact absorbing layer and coating curing The following composition components: Urethane-based paint main agent (Kansai Paint Co., Ltd .: Urethane Clear # 2026) 100 g Urethane curing agent (Kansai Paint Co., Ltd.) 33 g γ-Glycidoxypropyltrimethoxysilane 25 g Surfactant (Toray Silicone Co., Ltd. DC11PA) 0.05 ml Ethyl cellosolve 200 g were weighed and then mixed and dissolved to obtain a composition for a shock absorbing layer.

The plastic dyed lens substrate of the above item (1), which was subjected to plasma treatment as a pretreatment, was set on a spin coater manufactured by Mikasa Co., Ltd. with the R2 side facing upward, and the composition for the impact absorbing layer described above was set. 1 ml of the product was dropped, and immediately at a rotation speed of 1,000 rpm for 5 seconds, 2,000 rpm
It was rotated for 5 seconds to form a uniform coating film. Then, the coating film was dried and cured by heat treatment at 80 ° C. for 30 minutes. The thickness of the shock absorbing layer thus obtained is 1.
It was 8 microns. (3) Coating and curing of scratch-resistant layer A plastic-dyed lens substrate having a shock-absorbing layer on the R2 surface side is 10% at 60 ° C for the purpose of improving adhesion.
It was immersed in an aqueous solution of NaOH for 3 minutes, washed with water and dried.

Next, a silicone hard coat agent (NL70H manufactured by Nikon Corporation) was applied to the plastic lens substrate having the shock absorbing layer obtained in the above item (2) by the dipping method (pulling speed 90 mm / min) to give R1. Surface and R2 surface were applied simultaneously. Then, it was cured by heat treatment at 100 ° C. for 4 hours. The thickness of the scratch-resistant layer thus obtained was 2.2 μm. (4) Formation of Antireflection Layer For the lens obtained in the item (3), a SiO ₂ / ZrO ₂ type five-layer antireflection layer was formed on both surfaces of R1 and R2 by a vacuum deposition method. (5) Performance Evaluation The performance of the plastic dyed lens having the antireflection layer obtained in the above (4) was evaluated by the evaluation method as described above, and the results shown in Table 1 were obtained.

It has been confirmed that the plastic dyed lens is excellent not only in adhesion and scratch resistance but also in impact resistance and color loss resistance. Comparative Example 1 The dyed lens substrate used in Example 1 was directly provided with a scratch-resistant layer and an antireflection layer R1, without providing an impact absorption layer,
It was arranged on both sides of R2. The compositions of the scratch resistant layer and the antireflection layer were the same as in Example 1.

As shown in Table 1, the performance was inferior in impact resistance. Comparative Example 2 The lens base material used in Example 1 was coated and cured with impact absorbing layers on both sides of R1 and R2, and scratch resistant layers and antireflection layers were provided on both sides of R1 and R2. The impact absorbing layer is applied by a dipping method (pulling speed 60 mm / mi
n). The thickness of the shock absorbing layer thus obtained was 2.7 μm. The compositions of the shock absorbing layer, the scratch resistant layer and the antireflection layer were the same as in Example 1.

As shown in Table 1, the performance was such that color loss was large and it did not pass through a dyed lens.

[0025]

[Table 1]

[0026]

As described in detail above, the present invention provides a plastic dyed lens which is excellent in impact resistance and has good color-dyeing resistance of the dyed lens.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoya Tsujiya Marunouchi 3-chome 3-3, Chiyoda-ku, Tokyo Stock company Nikon (72) Inventor Toru Yatsushiro 3-chome 2-3 Marunouchi, Chiyoda-ku, Tokyo Ceremony Company Nikon

Claims (1)

[Claims] 1. A dyed plastic lens substrate,
The impact absorbing layer disposed on the R2 surface, the scratch-resistant layer and the antireflection film sequentially disposed on the impact absorbing layer, and R of the base material.
A plastic dyed lens for spectacles, wherein a scratch-resistant layer and an antireflection layer are sequentially provided on one surface.