JP2010150309A - Water-based primer composition, and plastic article using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a primer composition which is useful for forming a hard coat layer on a substrate, and enhances impact resistance of an article as a whole. <P>SOLUTION: The water-based primer composition includes: a water dispersion-based polyurethane resin (A); and a diene-based synthetic rubber type emulsion or an acrylic emulsion (B). The water-based primer composition is useful, for example, for manufacturing a plastics lens with high impact resistance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water-based primer composition, a plastic product using the same, and particularly to a plastic lens.

  Conventionally, polycarbonate has been known as a plastic lens lens substrate for spectacles that is excellent in hardness, impact resistance and the like. However, since the refractive index of polycarbonate is about 1.58 to 1.56, a material having a higher refractive index is required to make the lens substrate thin. Accordingly, polyurethane resin has attracted attention as a lens base material having a refractive index of about 1.60 to 1.70. However, since the polyurethane resin-based lens base is inferior to polycarbonate in terms of hardness, impact resistance, etc., a primer layer is formed on the lens base and a hard coat layer is further formed thereon to provide impact resistance, hardness, etc. I want to try to improve it. Although there is an FDA standard that requires safe impact resistance in the US eyeglass market, the impact resistance obtained even when a primer layer is provided is less than four times the FDA standard value.

  In recent years, “thin, light, and scratch-resistant” eyeglass lenses are increasingly required both in the domestic and overseas markets.

  Therefore, in order to increase the refractive index, polythioepoxy resins such as episulfide resins, which have a refractive index exceeding 1.70 and can exceed 1.74, have attracted attention. However, although the polythioepoxy resin-based lens base can increase the refractive index when the amount of the sulfur component added is increased, the addition of the sulfur component tends to increase brittleness and reduce impact resistance. Therefore, the impact resistance of the entire lens product is improved by forming a primer layer on the polythioepoxy resin-based lens substrate and further laminating a hard coat layer and an antireflection layer containing an inorganic metal oxide thereon. It has been broken. On the other hand, particularly in the US eyeglass market, the impact resistance is required to be at least four times the FDA standard value in practice, but the impact resistance of the polyepoxy resin lens product obtained by the above-mentioned technique is required. Sex cannot satisfy this requirement, and safety is insufficient when wearing spectacles using such a lens.

  In Patent Document 1, a self-emulsifying polyurethane aqueous dispersion produced by condensation of an anionic diol and a polyol selected from the group consisting of a polyether diol and a polyester diol and a polyfunctional isocyanate is applied to the surface of a plastic substrate. It is described that a primer layer is formed by applying and curing, and a hard coat layer is formed thereon. However, the polyepoxy resin lens obtained as described in Patent Document 1 has insufficient weather resistance adhesion and impact resistance.

  A primer composition mainly composed of a urethane elastomer is described in Patent Document 2.

Japanese Patent No. 3269630 JP-A-6-82604

  Accordingly, an object of the present invention is to provide a primer composition useful for forming a hard coat layer on a substrate, and improving the impact resistance of the entire product.

  Another object of the present invention is to provide a method for modifying a substrate made of a plastic and a modified product using the primer composition.

That is, the present invention provides a means for solving the above-described problems,
Primarily,
Provided is a primer composition containing (A) an aqueous dispersion polyurethane resin, and (B) a diene synthetic rubber emulsion, an acrylic emulsion, or a combination thereof.

  In the preferable embodiment, the composition may further contain (C) a water sol of metal oxide fine particles.

  Preferably, the water-dispersed polyurethane resin as the component (A) is nonionic.

  The primer composition is suitably used for forming a hard coat layer on a plastic substrate (hereinafter also referred to as a plastic substrate).

  Examples of the plastic substrate include a plastic lens substrate and a plastic flat plate.

  Examples of the plastic substrate material include transparent allyl diethylene glycol biscarbonate resin, polycarbonate resin, acrylic resin, urethane resin, thiourethane resin, epoxy resin, thioepoxy resin, polyolefin resin, and polyamide resin.

The present invention secondly,
Applying the primer composition to the surface of at least a part of a substrate made of plastic and drying to form a primer layer;
And a method for modifying a substrate made of plastic, which includes a step of forming a hard coat layer on the primer layer.

  An antireflection layer may be further formed on the hard coat layer as necessary.

Thirdly, the present invention provides a plastic product comprising a substrate made of plastic, a primer layer formed on at least a part of the substrate, and a hard coat layer formed on the primer layer. ,
Provided is a plastic product in which the primer layer is formed from the primer composition described above.

  An antireflection film can be further provided on the hard coat layer as necessary.

  A typical example of the plastic product is a plastic lens product in which the plastic substrate is a thioepoxy resin or urethane resin such as an episulfide resin having a refractive index of 1.70 or more. In particular, a plastic product in which the plastic substrate is a plastic lens substrate may be mentioned.

That is, the present invention is a plastic lens substrate made of polythioepoxy resin or urethane resin having a refractive index of 1.70 or more, a primer layer formed on at least one surface of the plastic lens substrate, and formed on the primer layer. In a plastic lens product having a hard coat layer,
The plastic lens substrate is made of polythioepoxy resin or urethane resin having a refractive index of 1.70 or more,
The primer layer is formed by applying and drying the above primer composition.
Also provided is a plastic lens product characterized by this.

  The plastic lens product usually has a center thickness of 0.5 to 1.3 mm and an impact strength value of 4.0 times or more of 0.204 Joule which is an FDA standard value.

  When the hard coat layer is formed on the surface of the substrate using the primer composition of the present invention, not only the hard coat layer can be formed on the substrate with high adhesive strength, but also the impact resistance of the product after the hard coat is formed is remarkable. improves. The high adhesion of the hard coat also gives the product excellent weather resistance.

  In particular, a plastic lens substrate made of a thioepoxy resin such as an episulfide resin having a refractive index of 1.70 or more can reduce the lens thickness, but has a drawback of poor mechanical strength. However, the primer composition of the present invention is used. When the primer layer is formed, a spectacle lens having an impact resistance of 4.0 times or more the FDA standard value can be obtained.

  Moreover, according to the present invention, it is possible to obtain a high-refractive index plastic lens having few interference fringes and excellent appearance.

  The refractive index of the primer layer obtained by the primer composition of the present invention can be adjusted by adding the metal oxide water sol to the composition according to the refractive index of the plastic substrate. Therefore, a plastic lens having few interference fringes and excellent weather resistance adhesion can be obtained.

  It is known that a thioepoxy resin-based lens substrate cannot be dyed, but a lens product can be colored by forming a dyeable primer layer. However, since it was difficult to increase the thickness of the primer layer, the degree of coloring was limited. In that respect, since the dyeable primer layer can be easily thickened by employing the primer composition of the present invention, the coloring degree of the lens product can be increased.

  Hereinafter, the present invention will be described in detail. In the present specification, the “plastic product” refers to a product in which a primer layer is formed on at least a part of the surface of a plastic substrate (ie, a plastic substrate) and a hard coat layer is further laminated. “Plastic lens substrate” means a plastic substrate molded into a lens shape, and “plastic lens product” means that a primer layer is formed on at least a part of the surface of the plastic lens substrate, and a hard coat layer is further formed. It means what was laminated.

<Primer composition>
The primer composition of the present invention contains (A) an aqueous dispersion polyurethane resin, and (B) a diene synthetic rubber emulsion, an acrylic emulsion, or a combination thereof as essential components.

-(A) Water-dispersed urethane resin-
The water-dispersed urethane resin is an aqueous dispersion of urethane resin. The urethane resin is not particularly limited as long as it is water dispersible, and may be nonionic, anionic, cationic or amphoteric.

  Examples of nonionic water-dispersed urethane resins include ADEKA Corporation's trade names Adeka Bon titer HUX-822, HUX-830, HUX-840, HUX-895, and SPX-168. When a nonionic water-dispersed urethane resin is used, a tough primer layer is obtained, and the primer layer is particularly excellent in heat-resistant coloring, flexibility, water resistance, durability, dust resistance and high hardness. In particular, durability can be further improved by using a crosslinking agent such as an epoxy resin in combination.

  Examples of the anionic water-dispersed urethane resin include trade names of ADEKA Co., Ltd .; Adekabon titer HUX-232, HUX-320, HUX-350, HUX-386, HUX-420, and HUX-522. By using an anionic water-dispersed urethane resin, it has water resistance, chemical resistance, abrasion resistance, and a high glass transition point, and can improve flexibility.

  Examples of the cationic water-dispersed urethane resin include trade name of ADEKA Co., Ltd .; Adekabon titer HUX-680. By using a cationic water-dispersed urethane resin, the water resistance is excellent and the flexibility can be improved.

  Among them, a particularly preferable water-dispersed urethane resin is a nonionic water-dispersed urethane resin, for example, a polymer polyol having a nonionic diol as a main component and having an average molecular weight of 200 or more, a chain extender, and an organic polyisocyanate compound. Examples thereof include water-dispersed urethane resins that are manufactured and forcedly emulsified and dispersed in water. A particularly preferable commercially available water-dispersed urethane resin liquid of this type includes Adekabon titer HUX series, which has nonionic ionicity of ADEKA Co., Ltd. and no formalin.

  The solid content concentration of the water-dispersed polyurethane resin (A) is usually 10 to 30% by weight, preferably 15 to 20% by weight.

-(B) Diene synthetic rubber emulsion or acrylic emulsion-
The diene synthetic rubber emulsion, acrylic emulsion or combination thereof used as the component (B) in the composition of the present invention is an aqueous emulsion using water as a dispersion medium. The component (B) has good compatibility with the aqueous urethane dispersion of the component (A) and has an effect of imparting good viscoelasticity to the primer layer. As a result, it is thought that it contributes to the improvement of the impact resistance of the product obtained by use of this primer composition.

  Examples of the diene synthetic rubber that is a dispersion polymer of the diene synthetic rubber emulsion include, for example, trade names S2990G, S2990L, and S2990H of carboxyl-modified JSR Corporation. By using a diene-based synthetic rubber emulsion, impact properties, compatibility, weather resistance and hardness of plastic products can be improved. S2990G used in Example 1 is preferable.

  Examples of the acrylic polymer that is a dispersion polymer of the acrylic emulsion include trade names SX-8990A, SX8900D, and SX402A of high carboxy-modified and carboxy-modified colloidal JSR Co., Ltd. Preferably, SX8900D used in Example 6 is used.

  The component (B) functions to impart good viscoelasticity to the resulting primer layer and increase the impact resistance after the hard coat is formed.

  Particularly preferred diene-based synthetic rubber-based and acrylic emulsions are S2990 series (trade name) which is a carboxy-modified diene-based synthetic rubber emulsion made by JSR Corporation, and SX8900 series (trade name) which is a carboxy-modified acrylic emulsion. ).

  The solid content concentration of the component (B) emulsion is usually 30 to 52% by weight, preferably 40 to 50% by weight.

  The blending amount of the component (B) in the primer composition of the present invention is such that the hardness of the resulting primer layer, the appearance of the plastic product (not easily whitened), the adhesion of the primer layer to the plastic substrate, and the impact resistance obtained. In this respect, the blending amount of the component (B) is 4 to 20 parts by weight per 100 parts by weight of the component (A). The lower limit is preferably 6 parts by weight or more, more preferably 8 parts by weight or more. The upper limit is preferably 14 parts by weight or less, more preferably 10 parts by weight or less.

-(C) Water sol of metal oxide fine particles-
The composition of the present invention preferably contains a water sol of metal oxide fine particles as the component (C). The metal oxide fine particles have an effect of increasing the refractive index of the primer layer to be formed. Therefore, particularly when the substrate is made of transparent plastic and used as a lens substrate, it is desirable that the difference in refractive index between the lens substrate and the primer layer is small. The refractive index of the primer layer can be adjusted by adjusting the blending amount of the component (C).

  Conventionally used metal oxide sols are water and alcohol as the dispersion medium, but this is not compatible with the water-dispersed urethane resin liquid of component (A). Has a low lifespan. However, the metal oxide water sol which is the component (C) of the present invention has good compatibility with the water-dispersed urethane resin of the component (A), and the resulting primer composition has good stability.

Examples of the water sol of metal oxide fine particles include SnO ₂ —ZrO—Sb ₂ O ₅ —SiO ₂ composite metal sol, TiO ₂ —SnO ₂ —ZrO ₂ —WO—Sb ₂ O ₅ —SiO ₂ composite metal sol, The particle diameter of the metal oxide fine particles is usually 10 to 100 nm, preferably 30 to 50 nm.

Examples of particularly preferable commercially available metal oxide fine particle water sols are HX305 series and HX307 series (trade names) mainly composed of SnO ₂ manufactured by Nissan Chemical Industries, Ltd.

  The solid content concentration of the component (C) metal oxide fine particle sol is usually 15 to 30% by weight, preferably 20 to 25% by weight.

  The compounding amount of the metal oxide fine particle water sol of the component (C) in the primer composition of the present invention is usually 20 to 100 parts by weight per 100 parts by weight of the solid content of the component (A). The lower limit is preferably 60 parts by weight or more. When the blending amount of the component (C) is too large, the hardness is hard and interference fringes are reduced, but the compatibility is deteriorated and the coating film is whitened. If the amount is too small, the predetermined refractive index is not reached and interference fringes appear.

-Other ingredients-
In addition to the above-described components, for example, a dyeing component, an ultraviolet absorber, a leveling agent, and the like can be added to the primer composition of the present invention as long as the purpose and effect of the present invention are not impaired.

  The solid content concentration of the primer composition of the present invention is preferably 10 to 40% by weight, more preferably 15 to 25% by weight, from the viewpoint of easy formation of a primer layer having a required thickness and good workability. More preferably 18 to 20% by weight.

-Formation of primer layer-
The primer composition is applied to a predetermined surface on which the hard coat layer of the substrate is to be formed, and dried. The application method is not limited, and for example, an immersion method, a spray method, a spin method, a flow coat method, a curtain coat method, or the like can be used.

  Drying and curing may be performed at room temperature, but curing can be promoted by heating at 85 to 100 ° C. in order to perform curing for a short time. The heating time may be appropriately selected, but may be about 5 to 20 minutes. Preferred examples include drying at room temperature for 20 minutes and heating at 90 ° C. for about 5 minutes. In this drying and curing process, it is presumed that a curing reaction occurs in the primer layer and a three-dimensional crosslinking is generated.

  Thus, the thickness of the primer layer obtained by drying is 1.5-3.0 micrometers, Preferably it is 2.0-2.5 micrometers. One of the advantages of the primer composition of the present invention is that the primer layer can be easily formed in this way. Conventionally used primer compositions using organic solvents as solvents (for example, trade names; CP-619 and CP-817, manufactured by SDC Technologies Asia) normal organic solvents such as normal butanol, isobutanol, and polypropylene glycol methyl Since a high boiling point ether such as ether was used, drying took a long time and workability was low. For this reason, it is difficult to increase the thickness of the primer layer in order to improve workability, and the maximum film thickness is about 1.0 μm, so there is a limit to improvement in impact resistance. However, when the primer composition of the present invention is used, a primer layer having the thickness as described above can be formed under the low temperature conditions as exemplified above (20 minutes at room temperature or 5 minutes at 90 ° C.). The impact resistance can be improved with good workability.

<Hard coat layer>
After forming the primer layer on the substrate, a hard coat layer is formed thereon. The hard coat layer is formed to improve scratch resistance, light transmission, weather resistance, and dyeability.

Examples of the hard coating liquid include inorganic metal oxide fine particle sol (for example, SnO ₂ , TiO _2,
ZrO _2, Sb ₂ O ₅ , SiO _{2 and} other metal oxide composite sols) are added to a silane coupling agent, hydrolyzed, and then mixed with a curing catalyst, UV absorber, dyeing component, leveling agent, etc. A liquid can be used.

Examples of the metal oxide fine particles include those described above in the description of the component (C), and a SnO ₂ —ZrO ₂ —Sb ₂ O ₅ —SiO ₂ composite sol is preferable.

  Examples of silane coupling agents include γ-glycidoxyethyltrimethoxysilane, β-glycidoxyethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ -Methacryloyloxypropyltrimethoxysilane, glycidoxymethyltrimethoxysilane, trimethylchlorosilane, tetramethoxysilane, vinyltrimethoxysilane, methyltrimethoxysilane, tetramethoxysilane and the like. preferable.

  The hard coat layer may be formed on the primer layer by applying the hard coat solution on the primer layer and drying it. The application method is not limited, and for example, an immersion method, a spray method, a spin method, a flow coat method, a curtain coat method, or the like can be used.

  The thickness of the hard coat layer is usually 1.5 to 10 μm, preferably 2.5 to 5.0 μm.

<Antireflection layer>
The antireflection layer is formed on the hard coat layer as necessary. It can be formed by a known method, for example, a method of laminating inorganic metal oxides such as SiO ₂ · TiO ₂ · ZrO ₂ · Al ₂ O _{3 in} 5 to 7 layers by vacuum vapor deposition, amorphous fluorine resin, etc. It is possible to use a method in which the organic antireflection liquid is applied to one layer by a coating method such as a dipping method, a spin method or a curtain coating method. A preferred antireflection layer is a laminated structure of SiO ₂ —TiO ₂ —ZrO ₂ or SiO ₂ —ZrO ₂ —Al ₂ O _3, which is vacuum-deposited by an ion assist method.

  The thickness of the antireflection layer is usually 100 to 300 nm, preferably 150 to 250 nm.

<Substrate>
Examples of the object to be modified by forming the primer layer and the hard coat layer by the method of the present invention include a substrate made of plastic. Examples of the plastic substrate include a plastic resin lens and a plastic resin panel.

  Hereinafter, the present invention will be specifically described based on examples.

[Example 1]
(1) To 50 parts by weight of a nonionic water-dispersed urethane resin (trade name HUX-840, manufactured by ADEKA Co., Ltd.), 9 parts by weight of N-methyl-2-pyrrolidone and 35 parts by weight of ion-exchanged water are added as a solvent. Furthermore, 5 parts by weight of a carboxy-modified diene emulsion (manufactured by JSR, trade name S2990G), and 1 weight of a fluororesin-based surfactant (manufactured by Sumitomo 3M, trade name: FC-4430) as a leveling agent Parts were mixed to prepare a primer composition having a solid content concentration of 18% by weight.

(2) Primer composition prepared in (1) on the convex surface side of an episulfide resin diameter 80 mmφ, center thickness 0.7 mm, convex meniscus plastic lens substrate (trade name: MR-174, manufactured by Mitsui Chemicals, Inc.) After applying the material, it was dried at room temperature to form a primer layer having a thickness of 2.0 μm. A hard coat liquid (manufactured by Asahi Optical Co., Ltd., product name: AHC162NT) was applied onto the primer layer in a dry state of touch and dried to form a hard coat layer having a thickness of 3.0 μm. Five inorganic layers of SiO ₂ —ZrO ₂ —Al ₂ O ₃ were laminated on the obtained hard coat layer by vacuum vapor deposition to form an inorganic metal oxide antireflection coating layer.

  The hard coat liquid (AHC162NT liquid) used here was a sol of metal oxide fine particles (manufactured by Nissan Chemical Industries, Ltd., trade name: HX-305M6) with 40 parts by weight of methyltrimethoxysilane (silane coupling agent). 30 parts by weight of hydrolyzate of Toray Dow Corning Silicone Co., Ltd., trade name; SZ-6070) and γ-glycidoxypropyltrimethoxysilane (Toray Dow Corning Silicone Co., Ltd., trade name: SH-6040) In addition, 25 parts by weight of a mixed solvent of methanol and methoxypropanol in a weight ratio of 1: 2; 3 parts by weight of aluminum acetylacetone as a curing catalyst; an ultraviolet absorber; and two types of silicone resin surfactants as a leveling agent (Toray Dow Corning Silicone Co., Ltd., trade name: Paintad PA-57 (0.5 parts by weight) and Paintad PA-31 (0.3 parts by weight)) 0.8 Those prepared by adding an amount unit.

[Example 2]
A primer composition (solid content concentration of 18) was used in the same manner as in Example 1 except that a carboxy-modified diene emulsion (manufactured by JSR Corporation, trade name: S2990L) was used instead of S2990G as the diene synthetic rubber emulsion. % Primer), a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 3
A primer composition (solid content concentration of 18) was used in the same manner as in Example 1 except that a carboxy-modified diene emulsion (manufactured by JSR Corporation, trade name: S2990H) was used instead of S2990G as a diene synthetic rubber emulsion. % Primer), a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 4
A primer composition (solid content) was obtained in the same manner as in Example 1 except that a highly carboxy-modified acrylic emulsion (manufactured by JSR Corporation, trade name: SX8900A) was used instead of S2990G, which is a diene-based synthetic rubber emulsion. A primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 5
Primer composition (solid content concentration) in the same manner as in Example 1 except that carboxy-modified colloidal acrylic emulsion (manufactured by JSR Corporation, trade name: SX8900D) was used instead of S2990G, which is a diene synthetic rubber emulsion. 18 wt%) was prepared, and a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 6
As a nonionic water-dispersed urethane resin, a primer composition was used in the same manner as in Example 1 except that ADEKA Co., Ltd., which had a characteristic of being hardened by not containing formalin as a crosslinking agent, instead of HUX-840, was used. (Solid content concentration: 16% by weight) was prepared, and a primer layer having a thickness of 1.8 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 7
In preparing the primer composition, a primer composition (solid content concentration: 10% by weight) was prepared in the same manner as in Example 1 except that the amount of ion-exchanged water used as a solvent was changed from 35 parts by weight to 60 parts by weight. Then, a primer layer having a thickness of 1.5 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coat layer were formed on the plastic lens substrate.

Example 8
A primer composition (solid content concentration of 15% by weight) was used in the same manner as in Example 1 except that an anionic water-dispersed urethane resin (manufactured by ADEKA, trade name: HUX-240) was used instead of HUX-840. %) And a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coat layer were formed on a plastic lens substrate.

Example 9
A primer composition (solid content concentration 20 wt.%) Was used in the same manner as in Example 1 except that a cationic water-dispersed urethane resin (trade name; HUX-680, manufactured by ADEKA Co., Ltd.) was used instead of HUX-840. %) And a primer layer having a thickness of 2.5 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on the plastic lens substrate.

Example 10
Example 1 is the same as Example 1 except that instead of the episulfide resin lens substrate used in (2) of Example 1, a material made of thiourethane resin (trade name; MR-8, manufactured by Mitsui Chemicals, Inc.) was used. Similarly, a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 11
Example 1 except that the material is a thiourethane resin instead of the episulfide resin lens substrate used in (2) of Example 1 (trade name; MR-7, manufactured by Mitsui Chemicals, Inc.) Similarly, a primer layer having a thickness of 2.0 μm, a hard coat layer having a thickness of 3.0 μm, and an antireflection coating layer were formed on a plastic lens substrate.

Example 12
The primer composition prepared in Example 1 was applied to one side of a transparent plastic flat plate made of polyamide resin (thickness 3 mm, A4 size) in the same manner as in Example 1 with a primer layer having a thickness of 1.5 μm and a thickness of 2 A hard coating layer and an antireflection coating layer of 5 μm were formed.

Evaluation test 1:
The primer solution used in the examples was cast on a flat dish-shaped stainless steel container, allowed to stand at room temperature for about 12 hours, solidified by natural drying, and formed into a 2 mm thick sheet. Table 1 shows the results of measurement of viscoelastic property values of the primer sheet using a solid viscoelastic device (trade name: DMA-50N, manufactured by Metravib).

  For reference, the measurement results of the impact resistance test of 5) of evaluation test 2 are also shown in Table 1.

Evaluation test 2:
Table 2 shows the results of evaluation of the following characteristics of the plastic lenses (lens center thickness: 0.75 mm) obtained in each example by the following method.

1) Appearance Transmitted light and reflected light were applied to the test lens under a three-wavelength daylight white fluorescent lamp, and the degree of interference fringes and whitening state formed on the coated lens were visually observed and evaluated according to the following criteria: . A rank of B- or higher is determined to be acceptable.

A: No interference fringes or whitening B +: Minimal interference fringes, but no whitening B-: Minimal interference fringes and minimal whitening C: Minimal interference fringes, significant whitening

2) Surface hardness Using steel wool mesh # 0000 in accordance with JIS K 5600 standard, rubbing for 10 reciprocations / 15 seconds under 1kg load, and counting the number of scratches generated on the coating, and then evaluating with the standard did. In Table 2, the number of scratches generated in parentheses is shown. A rank of B or higher is determined to be acceptable.

A: No scratch B: 1 to 3 scratches C: 4 or more scratches

3) Adhesiveness A cross-cut test was conducted according to JIS K 5600-5-6 standard. After peeling 10 times with cellophane tape (product name: “Cello Tape CT-24” (registered trademark)) as an adhesive tape, the adhesion of the film was observed and judged. The number of wrinkles that do not peel off in 100 mm (denominator) is shown in (numerator).

4) Compatibility In the primer composition used, the “compatibility” between the diene synthetic rubber emulsion or acrylic emulsion and other components was visually observed and evaluated according to the following criteria.

  ◯: “Compatible” when the primer composition as a mixed solution was transparent.

  X: When the primer composition which is a liquid mixture became cloudy or gelled, it was set as "no compatibility".

5) Impact resistance The US FDA requires an impact test (Impact test) to be passed for safety, such as plastic lenses for eyeglasses. According to the test, the geometry of the upper surface of the lens was placed horizontally from a height of 50 inches (127 cm) with a steel ball measuring 5/8 inches (16 mm) and weighing approximately 0.56 ounces (16.4 g). Drop to fall within a 5/8 inch (about 16 mm) diameter circle from the geometric center. A pass is accepted when no fracture occurs.

In this specification, the impact resistance of the plastic lens was evaluated as follows.
The impact energy value given to the test lens when a steel ball is dropped under the conditions specified in the FDA impact test is 0.204 joule (referred to as “FDA standard value” in this specification).
・ The FDA's weight is increased except that the weight of the steel ball is increased from 16.4 g to 32.8 g (2 times), 65.6 g (4 times), 131.2 g (8 times) and 196.8 g (12 times). The steel ball is dropped on the test lens under the same conditions as in the impact test, and the impact energy value applied is increased by 2 times, 4 times, 8 times, and 12 times. Then, the presence or absence of breakage (cracks, chips, fine cracks) in the test lens is observed visually and with a microscope, and the minimum impact energy value at which breakage occurs is measured. Impact resistance is evaluated based on how many times the minimum impact energy value is the FDA standard value.

6) Dyeability A dye solution was prepared by sufficiently dissolving 1 part by weight of Gray Color # 32000 or Brown Color # 32100 of a stain (BPI, trade name: Molecular Catalytic Dye) in 10 parts by weight of ion-exchanged water. . The lens as a test sample was immersed in the staining solution at 92 ° C. for 20 minutes, and the absorbance was measured at a wavelength of 550 nm using a spectral colorimetry system Color Space for PC apparatus DOT-3 manufactured by Murakami Color Research Laboratory. The same measurement was performed on the same lens as that of the test sample except that no staining was performed. Based on this measurement, the absorbance by staining was measured, and the staining density% of the lens was evaluated. (In other words, absorbance 0-100% corresponds to concentration 0-100%.)

Claims (12)

An aqueous primer composition comprising (A) an aqueous dispersion polyurethane resin, and (B) a diene synthetic rubber emulsion, an acrylic emulsion, or a combination thereof.   The water-based primer composition according to claim 1, further comprising (C) a water sol of metal oxide fine particles.   The water-based primer composition according to claim 1 or 2, wherein the water-dispersed polyurethane resin as the component (A) is nonionic.   The water-based primer composition according to any one of claims 1 to 3, which is used for forming a primer layer on a plastic substrate and further forming a hard coat layer on the primer layer.   The water-based primer composition according to claim 4, wherein the plastic substrate is a transparent plastic lens substrate or a plastic flat plate.   The water-based primer composition according to claim 5, wherein the plastic substrate comprises any of allyl diethylene glycol biscarbonate resin, polycarbonate resin, acrylic resin, urethane resin, thiourethane resin, epoxy resin, thioepoxy resin, polyolefin resin, or polyamide resin. object.   The water-based primer composition according to any one of claims 1 to 3 is applied to at least a part of the surface of a plastic substrate and dried to form a primer layer, and a hard coat layer is formed on the primer layer. Plastic product formed.   The plastic product according to claim 7, wherein an antireflection layer is formed on the hard coat layer.   The plastic product according to claim 8, which is a plastic lens or a plastic flat plate.   The plastic product according to any one of claims 7 to 9, wherein the base made of plastic is made of polythioepoxy resin or urethane resin having a refraction of 1.70 or more. A plastic lens substrate made of polythioepoxy resin or urethane resin having a refractive index of 1.70 or more, a primer layer formed on at least one surface of the plastic lens substrate, and a hard coat layer formed on the primer layer In plastic lens products,
The plastic lens substrate is made of polythioepoxy resin or urethane resin having a refractive index of 1.70 or more,
The primer layer is formed by applying and drying the primer composition according to any one of claims 1 to 3.
Plastic lens product characterized by that.   The thickness at the center of the plastic lens product is 0.5 to 1.3 mm, and the impact energy value is 4.0 times or more of 0.204 Joule which is the FDA standard value. Such plastic lens products.