JPS6046501A - plastic cleanse - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Plasti-9 lens that has excellent surface hardness and scratch resistance, and has an anti-reflective lens surface.

The safety of eyeglass lenses was reviewed in 1972 when the US FDA standards (standards for eyeglass safety) were established, and safer synthetic resin materials were used instead of inorganic glass as lens materials. It has become. In Japan, the share of plastic lenses is increasing year by year, and has already reached 5.
It is said to have exceeded 0%. This is because it takes advantage of the advantages of plastic materials such as safety, lightness, fashionability, dyeability, and ease of processing, and diethylene glycol bisallyl is currently the mainstream material for lenses for vision correction. Carbonate resin (hereinafter 0R-19
It is said that the market share of lenses (called ``lens'') is 30 to 40 percent.

Furthermore, the drawback of plastic lenses, which is their ease of scratching, has been improved, and several products are now on the market. On the other hand, consumer demand for lenses with less surface reflection has increased in recent years, and several types of lenses made of plastic lenses coated with multilayer antireflection coatings are now commercially available. [Kaji: This anti-reflection treatment involves forming a thin film on the lens using an inorganic material using a vacuum evaporation method, so it is difficult to improve the adhesion of the interface between the plastic and the inorganic material.
Furthermore, since lenses and inorganic thin films have considerably different flexibility, elasticity, and coefficient of thermal expansion, several drawbacks occur. In other words, the adhesion strength was drastically reduced due to thermal cycles between high and low temperatures. It is not practical because it has drawbacks such as peeling of the thin anti-reflection coating due to scratches caused by sand or the like.

On the other hand, JP-A-55-110126, JP-A-55-110
127 contains θiCh and At20 as inorganic vapor deposition materials as a means to suppress these drawbacks and meet consumer demands.
An inorganic hard coat layer containing 0.5 to 3.
A method is disclosed in which the film is applied to a thickness of 0 μm in order to improve the strength of the thin film. l, ka]7. This method not only has a limit in improving adhesion and does not fundamentally solve the problem, but also has the disadvantage of causing side effects and extremely low impact resistance, making it more susceptible to harm. What is emerging is the reality.

On the other hand, there are also products that are considered to be based on a method of applying antireflection treatment to a commercially available hard coat lens or a cured film of a composition developed for hard coat. However, all of these exhibit insufficient adhesion between the antireflection coat thin film and the lens material or hard coat lens material, and exhibit unsatisfactory drawbacks in terms of durability and quality (long-term) reliability. In other words, it has drawbacks such as the solister phenomenon (the surface swells) that occurs under high-temperature conditions such as sweating or in the bathroom, and peeling that progresses one after another as a result of deep scratches. Not only has no solution been found to improve the adhesion durability, but there are also cases where the impact resistance and adhesion strength are reduced. For example, examples disclosed as surface hardening methods include JP-A-52-112698, JP-A-57-2735,
Examples include Special Publication No. 57-42665. However, each of the disclosed examples contains an epoxy compound and a polycarboxylic acid to impart dyeability and flexibility to the cured film in order to improve processability, but on the other hand, If an anti-reflective finish made of a substance is applied, the adhesion between the hardened cedar and the anti-reflective layer is insufficient, resulting in extremely poor scratch resistance, and in durability tests, blister phenomenon occurs and the surface smoothness deteriorates. was lost, film baldness, and cracks occurred, and there was not even a single thing that was satisfactory.

On the other hand, Japanese Patent Publication No. 52-39691 discloses a composition comprising colloidal silica and methyltrimethoxysilane. However, this method lacks the homogeneity required for optical materials, and at the same time, when the hardened film is formed on a plastic material and an external material is further deposited, there is a gap between the hardened film and the plastic material.

Peeling occurs and cracks occur when the deposition is thin. This phenomenon is caused by the large amount of methyltrimethoxysilane present in the coating composition. Poor adhesion due to poor compatibility with plastic. It is thought that stress in the inorganic vapor deposited film was partially concentrated there, causing cracks and peeling. Due to the two problems of buried soil, it is difficult to apply plastic lenses as an optical material, which is the object of the present invention.

From this perspective, although it is a very important factor for performance, in plastic lenses treated with antireflection, it is possible to improve the adhesion between the inorganic antireflection film and the organic material. There have been no successful attempts to increase durability, and the reality is that consumers are content with the current level of durability.

That is, the present invention eliminates the conventional drawback of poor adhesion and achieves the present invention by imparting appropriate hardness to the fabric material and at the same time creating strong adhesion between the deposit 77j and the fabric. As a result of intensive studies on compositions that generate force and, as a result, improve the abrasion resistance of the deposited film and produce excellent durability, the present invention covers the following A, B, and The present invention relates to a plastic lens characterized in that an antireflection coating thin film made of an inorganic substance is provided on the surface layer of a cured film made of a coating composition containing C as a main component.

A) Colloidal silica with a particle size of 1 to 100 millimicrons B) General formula (% formula %) , or a hydrogen atom, and α is 1 to 5), and/or a hydrolyzed condensate thereof.

C) Coordination compounds, no-halides, acid halides, or peroxides/% halide of magnesium.

Next, the constituent components of the coating composition used in the present invention and the antireflection coating thin film will be described.

The colloidal silica having a particle size of 1' and 100 mm as component A is one in which polymeric bond silicic anhydride is dispersed in a dispersion medium such as water, alcohol, or cellosolve, and is produced by a well-known method. It is a commercially available Higashi. Particularly useful in the practice of this invention are particles with a grain size of 5 to 40 mμ. This component is essential for increasing the hardness, moisture resistance, and compatibility of the cured film with the anti-reflection coating layer, structurally strengthening the anti-reflection coating film, and improving durability. It is. Among these, methanol, ethanol, and improper tool are commonly used as dispersion media. In addition, water-dispersed colloids can also be used, but in this case they must be thoroughly dried. There is no problem in using such a dispersion medium as long as it has a high boiling point and an acceptable evaporation rate. Also, for this use, 1
is 75% by weight of the cured film components at the stage of heat curing.
From 35 weights! Better effects can be obtained by using a weight ratio of 75% to 50% by weight. If the amount of component A used is 75 times F# or more, this is undesirable because it causes cracks in the cured film. Also 35 weight 1
If it is less than 1%, the adhesion to the antireflection coating thin film will be poor, so the effects of the present invention cannot be expected. In addition, the silica concentration in the dispersion medium of component A is 20 to 35: @i
% is stable and convenient to use.

Next, the organic chain of the silane compound having an epoxy group as an organic chain constituting the Bfj component is dissolved as follows.

be. ) Specific examples of such compounds include r-glycidoxyprobyltrimethoxysilane, r-glycidoxyprobyltriethoxysilane, bis(r-ri!Jcidoxyprobyl)dimethoxysilane, tris(γ-glycidoxy (propyl)methoxysilane, β(34-epoxycyclohexyl)ethyltrimethoxysilane, and the like. In addition, since this alkoxy group is hydrolyzed during use, it is substantially hydrolyzable, and functional groups that replace the hydroxy group, such as hydrogen, chloro, and acetoxy, are also qualitatively equivalent. . j h et al. 0・o 4 )l' /l
/ ' / 'J h in a dispersion medium, or separately in a solvent that freely mixes with water, such as alcohol, ketone, ester, alcohol ether such as oxytol, carpitol, etc.

It is used after hydrolysis under an acid catalyst of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, or acetic acid. However, at this time, when using a compound that has free radicals that are easily hydrolyzed, it is necessary to leave it to hydrolysis due to moisture in the air when drying and hardening after coating, or to use a small amount of water to act as a catalyst. An sj-o-si bond may be formed by repeating hydrolysis and dehydration condensation. Component B obtained by the above operation exists as a homogeneous solution containing a partially dehydrated and condensed polymer.

This B component is necessary to obtain durability of the cured film itself. That is, although component B has a well-known coupling effect on inorganic fine particles, the feature of the present invention lies in its effect of alleviating shrinkage due to curing associated with the ring-opening reaction of epoxy residues, and the use of a general coupling agent. It's a very different thing.

It is estimated that by using this component, the residual stress will be reduced by about a factor of 50. Another effect of I/C is that the resulting cured film has a high adhesion to 0F-39 when the base material is plastic, and even if a thin film made of an inorganic substance is further added to the soil layer of the hardened film, neither layer It is important to maintain strong adhesion. This is considered to be due to the fact that the epoxy portion is oriented L7 on the surface of the plastic base material, undergoes a ring-opening reaction, and partially reacts with the hydroxyl groups on the base material and surface to form a covalent bond. In fact, this is probably because hardness and adhesion cannot be obtained with a silane coupling agent having a group that does not have ring-opening reactivity.

The magnesium compound added as component C is an essential component in order to improve the stability of this coating solution. That is, it has the property of inhibiting ring opening of epoxy and silanol groups and dehydration network alloying at room temperature, and accelerating or not inhibiting the above reaction during heat curing. Furthermore, another characteristic is that it has the important property of not causing a decrease in adhesion with the vapor deposited film after the cured film is formed. However, if this does not affect the adhesion with the deposited film, a simple method of rinsing with a solvent such as water or alcohol can also produce good results. Specific examples of substances exhibiting the above-mentioned important properties include magnesium chloride, chlorate, 3kl chlorate, bromine instead of chloride in the previous 51 compounds, and chlorine in the previous ne compound. Instead, iodine or magnesium acetylacetonate is preferred. Other substances such as magnesium alcolade, organic acid salts, thiocyanate or sulfuric acid salts, phosphates, nitrates, etc. can be used with the same effect as long as they generate magnesium ions in the composition when used. can be expected, but care should be taken to exclude the influence of counter ions.

The amount of component C to be used is preferably in the range of 0.01 to 2% by weight, more preferably in the range of 0.01 to 0.5% by weight, based on the solid content in the coating liquid. That is, if it is less than 001 weight, the effect is not sufficient, and if it is 05 weight or more, there is no particular increase in the effect, and if it is 2 weight or more, yellowing of the cured film or poor curing occurs.

The essential components of the cured film of the present invention are as described above.

In addition, depending on the coating method, a solvent such as alcohol, ester, ketone, oxytol, mineral solvent, toluene, or chlorofluorocarbon can be added to the dispersion medium of component A. Furthermore, in order to obtain smoothness of the cured film, a surfactant or a chicken agent can be selected and used. The coating method described here should be selected depending on the shape, size, and month of production of the lens substrate, such as flow coating, Nuprey method, deliving method, spinner coating, etc.

Furthermore, in order to add additional eye protection, it is possible to add an appropriate amount of an ultraviolet absorber or dye to produce ultraviolet-blocking and colored lenses. Further, high functionality can be achieved by including a photochromic material or the like.

The lens material that serves as the base material can be applied to a wide variety of plastics, not just the base material nCR-59, because it is expected to have good adhesion to the base material by applying chemical etching or dry etching. .

Plasti with the thus obtained cured film -
The present invention can be achieved by using a vehicle in which the I-cleanse is provided with an anti-reflection coating thin film as described below. That is, vacuum evaporation method,
Boo, 5ZO2, 8 by ion sputtering method
LSIk, 'TiO2, ZrO2, Al2O3, Mg
Reflection at the interface above the atmosphere can be kept low by applying a single layer or multiple layers of thin film that is larger than the body of a reed. The optical thin film at this time has a film thickness of λo/4
(λo; 450-650 nm) single layer, Aiken/4-λo/2-λ0/4Matake λo/4-λo/4-
A multilayer coating consisting of three layers having different refractive indexes of λo/4, or a thin antireflection coating consisting of each layer coating partially replaced with an equivalent layer is useful.

The plastic lenses obtained by this process have excellent scratch resistance, adhesion, heat resistance, water and oil resistance7, and because there is little surface reflection, there is no flickering, and they are highly transparent and highly practical. It is important as an eyeglass lens. Fourth, by taking advantage of this property, it is also useful for cameras, telescopes, light beam concentrators, window panels for measuring instruments, transmission glasses, and watch glasses.

Hereinafter, the present invention will be described in detail based on examples.
! However, the present invention is not limited to these.1. Part Vi represents parts by weight in the fire solution.

Example 1 (1) Preparation of coating composition and cypress cloth.
- 108 parts of glycidoxyprobyl silane, colloidal silica dispersed in Impronoquinol (manufactured by Catalysts & Chemicals Co., Ltd. "080/L-1432" solid content concentration 30%)
230 parts of L meisobronochlorinol and 220 parts of L meisobronophenol were added in order, and 52 parts of 005N hydrochloric acid was cooled and added dropwise over 60 minutes while stirring without exceeding 25°C. Next, flow control agent (Nippon Unicar “L-76”)
04'') was added to obtain a homogeneous transparent liquid.

This solution was aged at 20°C for 24 hours. Next, add 0.15 parts of magnesium chloride to this solution, stir well, and then use a 1μ regular membrane filter to remove 3 times.
i+ It was a very good coating liquid. The viscosity of this coating liquid is B
It was 4.50 PS (20°C) using a type viscometer.

This solution was previously degreased and cleaned with a 04% sodium hydroxide aqueous solution, and then applied by dipping to an OR-69 lens that had been washed with water and thoroughly dried. The pulling speed at this time was 20 cm1miη. This lens was heated and cured in a heating drying oven at 80° C. for 1 hour and at 130° C. for 1 hour. The thickness of the cured film of the obtained lens was 2.
1 μηL O(2) Formation of anti-reflection coating thin film This lens was washed with a weak alkaline detergent, then with water, and after drying, the lens base L1 was coated using a vacuum evaporation method as shown in Figure 1. set in the ground.

An antireflection layer B1 was provided on the cured coating layer A1. In addition, B1 is ZrO211, Altos in order from the A1 side.
12.

It is a four-layer antireflection layer consisting of Zr02j5 and Bi0214, and the total optical thickness of the first ZrO211 and At20512 is 75; λ0 is 510 parts m.

The reflection characteristics of the lens thus obtained are shown in FIG.

(3) Tests and Results Lenses will be tested using the method described below, and the results will be shown in the annual table.

α) 11i1 abrasion resistance: # (1 with 1000 steel wool)
A load of wa was applied to the surface and the surface was rubbed back and forth 10 times, and the degree of scratches was visually evaluated in the following stages: A: No scratches within a 1cm x 3cm area B: 1 within the above range ~10 scratches (C: 10~ in the above groove)
100 scratches D: Countless scratches, but a smooth surface remains E: No smooth surface remains due to scratches on the surface b) Water resistance. Chemical resistance: water. It was immersed in alcohol and kerosene for 48 hours, and the surface condition was examined.

C) #4 acid, detergent resistance: 0. It was immersed in IN@acid and 1% Mama Lemon (manufactured by Lion Oil ■) aqueous solution for 12 hours, and the surface condition was examined.

d) WI4aP property: The surface condition was examined after being exposed to a sunshine weather meter using a xenon lamp for 400 hours.

e) Adhesion: The adhesion between the cured film or the antireflection coat thin film and the lens was determined by a crocut tape test according to J-Tech 5D-o2o2. That is, using a knife,
Make cuts on the lens surface at intervals of 1 mm. Form 100 squares. Next, after strongly pressing cellophane adhesive tape (Cellotape q, manufactured by Nitto Kagaku q) on the surface of the bale, pull it suddenly in a 90° direction from the bale surface to peel it off. The grid was used as an adhesion index.

, f) Durability: Durability is essentially the persistence of adhesion, and for those tested in α) to d), the Kuronuka 9 Tape Trial I! 41 was conducted and evaluated.

(7) 1Fil thermal resistance (cold/heat cycle resistance): 7.
It was stored in warm air at 0°C for 1 hour and its appearance was examined. Another -5℃
15 minutes, 60 parts ℃ 15 minutes cycle 5 times (repeat L7,
Appearance and cross-cut tape tests were conducted, and those with no peeling of the coating were evaluated as good.

) Impact resistance: A steel ball drop test was conducted based on FDA standards. That is, a steel ball of approximately 16.4 q was allowed to naturally fall from a height of 127 km toward the center of the lens, and the lens was checked for cracks. This test was repeated several times, and the appearance of p.
He called things that are not ordinary good. The center thickness of this test lens is:

2ilIl+ was used.

i) Liquid or life: Coating liquid adjustment He applied the coating as appropriate, obtained a hardened lens, applied 1 anti-reflection treatment, conducted tests α) to h), and indicated the period during which the performance and evaluation results were exactly the same. 7'C.

Example 2 In a flanco equipped with a stirrer, 40 parts of r-glycidoxypropyltrimethoxysilane, 225 parts of inglobal-dispersed colloidal silica (solid content 60 g and
100 parts of alcohol was added and stirred to form a homogeneous solution. After that, L-7 was left to mature at room temperature for 24 hours, and the resulting liquid was
0.001 part of 604 and 0.05 part of magnesium bromide were added, filtered through a 1 μm membrane filter, and the coating solution was taken. Ar plasma treatment (400 W for 30 seconds) was performed in advance in this solution (!F-39 lens was immersed,
Pull it up at a speed of cm7min, and after drying, heat it at 80℃ for 1
It was then cured for 1 hour at 130° C. (humidity: 80° C., 30 hours). The thickness of this cured film was 2 μm.

The obtained lens was coated with a thin antireflection coating and tested in the same manner as in Example 1. The results are shown in Table 1.

Example 3 In Example 1, as the antireflection coat thin film layer B3,
As shown in Figure 3, starting from the A3 side, KF3i0231,
ZrO252, Bib255, Zr0234, Si
The first Sjo is an anti-reflection film consisting of five layers consisting of N, '55.

The total optical thickness of 5j, ZrO252, and SjO□33 is about λoA, and the next Zr0234 is λO/4 s e upper layer El
The reflection characteristics of a lens obtained in the same manner as in Example 1 except that a thin film having zOz35 of λ0/4 was formed are shown in FIG. 4, and the evaluation results are shown in Chiku1 Light.

Examples 4 to 6 Comparative Example 1 The coating liquid was prepared, applied, and cured in the same manner as in Example 1, and instead of one piece of isopwanol-dispersed coroita liquid, one piece of coroita liquid was added to r - In place of 6-molecular acid oxypropyltrimethoxysilane, 6 m of silane (I) is used as a silane salt, and instead of magnesium, various catalysts are used. Furthermore, the lens thus obtained and having the hardened Ich film had the same film structure as in Example 6 and was coated with an anti-reflection JE film. The evaluation results are shown in Table 1. Moreover, as a proportional example, the case where there is no C component is shown.

Comparative Example 2a fJfJt of the coating composition of Example 1, except that 70 parts of the 108 parts of γ-I lysidoxybrobyltrimethoxysilane and 20 parts of 005 aqueous hydrochloric acid were used instead of 52 parts. was carried out in the same manner as in Example 1 to obtain an OR-39 lens having a hardening material film. This lens f
When anti-reflection treatment was applied by tL dry deposition, cracks occurred in the lens fabric, and the trial was unsuccessful.

Comparative Example 2b In the preparation of the coating composition of Example 1, 90 parts of Improper Tool dispersed colloidal silica was used instead of 230 parts.
A test lens was obtained by dipping, curing and antireflection treatment in the same manner as in Example 1, except that 90 parts of isopropanol was used instead of 220 parts. The evaluation results are shown in Table 1.

Example 7 55 parts of Futilef, 2,2-bis[3,5-dibromo-4
-(2-Melcryloyloxyethoxy)phenyl 11
07745 parts of 2-hydroxy-4-methoxybenzophenone, 05 parts of 2-hydroxy-4-methoxybenzophenone, and 15 parts of utsuroyl peroxide were mixed, poured into a glass mold for lens molding, and subjected to e-processing and j-type polymerization at 80°C for 6 hours. A? "Plasma treatment (400 W for 30 seconds) was performed. This lens was immersed in the coating liquid obtained in Example 4, and 20 CfrVrni
Table 1 shows the results of the anti-reflection treatment and evaluation performed in the same manner as in Example 4.

Comparative Example 3 Aqueous sol containing Rio2 with a particle size of 10 to 50 mμ (Snowtex 1 manufactured by Nichirei Chemical Co., Ltd. solid content 20%) 2 in a flask
Using 63 parts, Nα20 was adjusted to 0.01 weight and the pH was adjusted to 31, and then 5.3 parts of glacial acetic acid was added, and 96 parts of methyltrimethoxysilane was added to make vJ+. Thereafter, 132 parts of isopropanol was added and aged for 24 hours to obtain a coating liquid. After applying this to the lens and curing it in the same manner as in Example 1,
Anti-reflection treated. Attach adhesive tape to this lens interface and peel off the tension tape in a 90° direction.1. ．． fC
However, no antireflection coating remained.

Comparative Example 4 In Example 1, instead of forming a cured film by coating, one inorganic node coating layer consisting of 5j02 was used.
A lens was fabricated with a thin film of anti-reflection coating on it. The evaluation results are shown in Table 1.

Example 8 In Example 5, 15 parts of 1.3°6-trimethylindolino-8-bromo-6'-bromobenzopyrylospirane and 1,3.5-trimethylindolino-7 were added to the obtained coating solution. Finitropenzovirirospiran 5 parts, 1,3
．． 10 parts of 3-trimethylindolino-5'-nitro-8'-methoxybenzopyrylosyran was added and stirring was continued for an additional 2 hours to obtain a phototropic coating liquid. An 0R-39 lens that had been cleaned with a neutral detergent was immersed in this solution, pulled up at 40 cm for 7 minutes, and dried.
Hardening and antireflection processing were performed in the same manner as in Example 1. This lens will turn brown instantly in sunlight or in the dark.

It became transparent at 70°C, and the same coloring and fading occurred even after 10 recyclings, yielding a photochromic lens with excellent wear resistance.

Example 9 The same procedure as in Example 1 was carried out except that a dyed color plastic lens (Suwa Seikosha's Seiko Blacks Brown Herr 7351) was used for the scent of the transparent (!R-39 lens). An antireflection lens was obtained.This lens was in good condition, with the dyeing density decreasing by only 1 inch due to the history of coating, heat, vapor deposition, and cleaning.

The evaluation results are shown in Table 1.

In addition, the transmittance of Examples 1 to 9 and Comparative Examples 1 to 4 is 98 to 9.
85%, indicating good permeability.

The present lens disclosed in the above embodiments exhibits strong durability and excellent transparency when used in various optical components including eyeglass lenses, and can be widely applied.

[Brief explanation of drawings]

FIG. 1 shows Examples 1, 2.7.8.9 and Comparative Example 1.
FIG. 2.3 is a diagram showing the formation of the lens film 41N in 2.3. A1 is a cured film layer, B1 is an antireflection layer, and 11 thin film layers are Zr.
O2, layer 12 is Al2O5* layer 13, ZrO2, layer 14
is 5iQ2. FIG. 2 is a diagram showing all the spectral reflectance characteristics of the lens of Example 1, where the horizontal axis is the wavelength of light and the vertical axis is the reflectance of light on one surface. FIG. 3 shows the film formation of lenses in Example 3.4.5.6 and Comparative Example 4. A3 is a cured film layer, B3 is an antireflection layer, thin film layer 31 jd 5jOz, layer 32
keZrCn, ); 433 is 5zOz, JW 34
n Zr0z, layer 651-tSi02. FIG. 4 is a diagram showing the spectral reflectance characteristics of the lens of Example 3, where the horizontal axis is the wavelength of light, and the vertical axis fllb is the reflectance of light on one surface. That's all Ganto Kamiyama Suwa Seikodai Co., Ltd. Agent Patent Attorney Tsutomu Mogami Figure 1 +: (- Figure 2

Claims (6)

[Claims] (1) A plastic lens characterized by having an antireflection coating thin film made of an inorganic substance formed on the surface layer of a cured film made of a coating composition containing the following main components A, B, and C. A) Colloidal silica with a particle size of 1 to 100 millimicrons B) General formula %) (In the formula, R2 is an organic group containing an epoxy group, and R2 has a carbon number of 1
represents a hydrocarbon group, an alkoxyalkyl group, or a hydrogen atom of 1 to 4, and α is 1 to 3. ) and/or a hydrolyzed condensate thereof. C) Coordination compounds, halogenides, acid halides, or peroxide halides of magnesium. (2) The anti-reflection coat thin film is made of SiO, IMOz
. His N4, 'M O2, ZrO2, Al2O5
, M17F2. The plastic lens according to claim 1, which is a single multilayer coating consisting of one or more silk combinations selected from the group of: , M17F2. (3) A and B of the cured film, respectively, are S?
; Calculated as 02 + R' S t Os/2, A is 75% to 35% by weight, B is '2525% by weight 65% by weight, and C is based on 100 parts by weight of the total amount of A and B. Claim 1 which is 0.01 to 2 parts by weight
Plastic lenses as described in section. (4) The epoxy groups in the B bM portion of the previous NC cured film are:
Cleanse. (5) Claim 1, wherein the plastic lens is diethylene glycol bisallyl carbonate a.
Plastic lenses listed in section. (6) The Plasti-I cleanse according to claim 1, wherein the plastic lens is made of an acrylic or styrene-based Plasti® material.