JP2003326538A - Method for manufacturing resin molded body - Google Patents

Abstract

(57) [Problem] To produce a resin plate having a surface layer excellent in antistatic property, scratch resistance and transparency with high productivity. SOLUTION: A first step of applying an ultraviolet curable coating material (A) containing conductive fine particles and a solvent to a film; drying the film until the solvent content of the coating film of the coating material (A) becomes 10% by mass or less. 2 steps; UV curable paint (B) containing no conductive fine particles and containing no solvent, with the dried paint (A) coating film as the mold side
A third step of attaching the film to the mold with an intervening step; and a fourth step of irradiating ultraviolet rays through the film to cure the paints (A) and (B).
Step 5: peeling off the film while leaving the cured coating on the mold; Step 6 of preparing a mold with the cured coating surface of the mold as the inner surface; Step 7 of performing casting polymerization using the mold; And thereafter, an eighth step of releasing the resin molded body having the cured coating film on the surface from the mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product (especially an acrylic resin laminate) having a plate-like shape and excellent in transparency, antistatic property and scratch resistance, which is suitable for applications such as a display front plate. Manufacturing method.

[0002]

2. Description of the Related Art Acrylic resins are characterized by their good transparency, impact resistance, easy moldability, etc., and are widely used as industrial materials, building materials and the like. In recent years, due to its transparency and impact resistance, it has come to be used as a front plate of various displays such as CRTs and liquid crystal televisions. However, like other resins, acrylic resin is softer than glass, so that scratches and the like are likely to occur. In addition, since acrylic resin has a high volume resistivity, transparency may be easily deteriorated due to adhesion of dust due to static electricity. In order to suppress these problems, many improvements have been attempted in the past, but effective means have not been known so far.

[0003]

As a method of improving scratch resistance, it is known to form a crosslinked coating on the surface of a substrate by using a polyfunctional monomer such as a polyfunctional (meth) acrylate. There is. However, conventional cross-linked coatings often show no or insufficient antistatic ability.

As a method of improving the antistatic property, a method of laminating a coating film containing a conductive powder containing tin oxide as a main component is known. That is, in JP-A-60-60166 and JP-A-60-181177, a coating composition capable of forming a coating film having excellent abrasion resistance and hardness as well as excellent conductivity and transparency is disclosed. , A conductive coating composition containing a conductive powder containing tin oxide as a main component and having an average particle diameter of 0.2 μm or less is disclosed. In addition, Japanese Patent Publication No. 7-31953 discloses a polymerizable composition for forming a scratch-resistant film, which contains a conductive powder containing tin oxide as a main component.

However, in the case of a coating film containing a conductive powder such as tin oxide as described above, if the film thickness is increased until good scratch resistance is obtained, coloring due to the conductive powder may occur or the surface may be deteriorated. In some cases, the transparency may be deteriorated due to unevenness or the like.

In view of the above situation, the present invention is a method for producing a resin molded product having a surface layer having sufficient antistatic properties and excellent scratch resistance and transparency with high productivity. The purpose is to provide.

[0007]

The present invention provides a film,
The first step of applying the ultraviolet curable coating material (A) containing conductive fine particles and a solvent, the applied ultraviolet curable coating material (A) until the solvent content of the coating film is 10% by mass or less. In the second step of drying, the coating film of the dried UV-curable coating material (A) is used as a mold side, and the UV-curable coating material (B) containing no conductive fine particles and substantially no solvent is interposed. , A third step of attaching the film to a mold,
UV irradiation through the film to cure the UV curable coating (A) and the UV curable coating (B)
Process, 5th process of peeling off the film leaving a cured coating film on the mold, 6th process of making a mold with the cured coating film surface on the mold as the inner surface, casting polymerization using the mold The seventh step of carrying out, and after the completion of the polymerization, the resin molded body having a layer made of a cured coating film on the surface is peeled off from the mold.
The method for producing a resin molded body includes the step of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a first step, first, an ultraviolet curable coating material (A) containing conductive fine particles and a solvent is applied to a film.

It is preferable that the film used here has solvent resistance that allows the ultraviolet rays used for the subsequent curing to pass therethrough and does not swell with the ultraviolet curable coating material (A), and has a low oxygen transmission rate. An example of such a film is a biaxially stretched film of polyethylene terephthalate. The thickness of the film is preferably 1 μm or more from the viewpoint of maintaining film strength, and 200 μm from the viewpoint of handleability and cost.
The following are preferred.

The UV-curable coating material (A) may be, for example, conductive fine particles, a monomer or oligomer having two or more (meth) acrylate groups in one molecule, and a polar group in the molecule if necessary. 1 in 1 molecule
A composition containing a polymerizable compound, a photoinitiator, a solvent, and the like, which is used in combination with a monomer having one functional group, is used.

The conductive fine particles contained in the ultraviolet curable coating material (A) include, for example, tin oxide or tin oxide, and antimony, phosphorus, fluorine, zinc, tellurium, bismuth,
Fine particles doped with one or more elements such as cadmium, or fine particles of indium oxide or indium oxide doped with elements such as tin, fluorine, phosphorus, antimony, and antimony oxide 5, are used. The particle size of the conductive fine particles is preferably 100 nm or less, and more preferably 50 nm or less in order to obtain good transparency. Further, it is preferably 1 nm or more in order to obtain stable dispersibility. The content of the conductive fine particles is 60% by mass or less based on all components other than the solvent in the ultraviolet curable coating material (A) from the viewpoint that excessive swelling due to a monomer during cast polymerization of the obtained coating film is unlikely to occur. preferable. Further, in order to obtain a good antistatic ability, it is preferably 1% by mass or more in all components other than the solvent in the ultraviolet curable coating material (A).

The monomer or oligomer having two or more (meth) acrylate groups in one molecule is obtained, for example, from 1 mol of polyhydric alcohol and 2 mol or more of (meth) acrylic acid or a derivative thereof. Esterification products obtained from polyhydric alcohols, polyhydric carboxylic acids or their anhydrides, and (meth) acrylic acid or their derivatives; urethane (meth) acrylates;

Specific examples of the esterified product obtained from 1 mol of polyhydric alcohol and 2 mol or more of (meth) acrylic acid or a derivative thereof include diethylene glycol di (meth) acrylate and triethylene glycol di (meth) acrylate. , Tetraethylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth)
Acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, glycerin tri (meth) acrylate, dipentaerythritol penta (meth) Examples thereof include acrylate, dipentaerythritol hexa (meth) acrylate, tripentaerythritol hexa (meth) acrylate, tripentaerythritol hepta (meth) acrylate and the like.

Specific examples of esterified products obtained from polyhydric alcohols and polyhydric carboxylic acids or their anhydrides and (meth) acrylic acid or their derivatives include malonic acid, succinic acid, adipic acid, glutaric acid and sebacine. acid,
Obtained from polyvalent carboxylic acids such as fumaric acid, itaconic acid and maleic anhydride or anhydrides thereof, polyhydric alcohols such as trimethylolethane, trimethylolpropane, glycerin and pentaerythritol, and (meth) acrylic acid 1 An ester compound having two or more (meth) acryloyloxy groups in the molecule can be mentioned.

Specific examples of urethane (meth) acrylates include tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, toluylene diisocyanate, diphenylmethane diisocyanate, and aromatic compounds of these diisocyanate compounds. Diisocyanate compounds obtained by hydrogenating group isocyanates (for example, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate and other diisocyanate compounds), triphenylmethane triisocyanate, dimethylene triphenyl triisocyanate and other divalent compounds Or trivalent polyisocyanate compound or diisocyanate Of a polyisocyanate compound obtained by polymerizing a salt compound, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxy-3-methoxypropyl (meth) acrylate, N-methylol Active hydrogen such as (meth) acrylamide, N-hydroxy (meth) acrylamide, 1,2,3-propanetriol-1,3-di (meth) acrylate, 3-acryloyloxy-2-hydroxypropyl (meth) acrylate Urethane (meth) acrylate obtained by reacting the acrylic monomer has.

In addition to these, poly [(meth) acryloyloxyethyl] isocyanurate such as di (meth) acrylate and tri (meth) acrylate of tris (2-hydroxyethyl) isocyanuric acid, and known epoxy Polyacrylate and the like can also be mentioned.
The various compounds described above may be used in combination of two or more, if necessary.

In the ultraviolet curable coating material (A), a monomer having a polar group in the molecule can be used together for the purpose of improving the dispersion stability of the conductive fine particles. Examples of the monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4
-Hydroxybutyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, benzyl (meth) acrylate, dimethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide and the like can be mentioned.

The amount of each of the above-mentioned various polymerizable compounds used is 30 in all components other than the solvent of the ultraviolet curable coating material (A).
It is preferably in the range of ˜98.9% by mass from the viewpoint that the coating film has good curability by ultraviolet rays and that the resulting coating film is unlikely to swell excessively with a monomer during cast polymerization. The amount of the monomer having a polar group in the molecule is preferably 30% by mass or less for the same reason.

As the photoinitiator, for example, benzoin,
Benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, acetoin, butyroin, toluoin, benzyl, benzophenone, p-methoxybenzophenone, 2,2-diethoxyacetophenone, α, α-dimethoxy-α-phenylacetophenone, Methylphenylglyoxylate, ethylphenylglyoxylate, 4,4′-bis (dimethylamino) benzophenone,
2-hydroxy-2-methyl-1-phenylpropane-
Carbonyl compounds such as 1-one; sulfur compounds such as tetramethylthiuram monosulfide and tetramethylthiuram disulfide; 2,4,6-trimethylbenzoyldiphenylphosphine oxide, benzoyldiethoxyphosphine oxide and the like. The addition amount of the photoinitiator is preferably 0.1% by mass or more from the viewpoint of curability by ultraviolet rays in all components other than the solvent in the coating material, and 10% by mass or less from the viewpoint of maintaining a good color tone of the coating film. preferable.

The solvent is used for the purpose of reducing the viscosity of the coating by dilution and improving the dispersion stability of the conductive fine particles. Examples of the solvent include methanol, ethanol, 2-propanol, 2-butanol, methyl cellosolve, ethyl cellosolve, tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, methyl acetate, ethyl acetate and the like. The content of the solvent is preferably 15% by mass or more in the ultraviolet curable coating material (A) for the purpose of ensuring good coatability and dispersion stability of the conductive fine particles. From the viewpoint of load, 90% by mass or less is preferable.

Further, a dispersion aid, a leveling agent, etc. for improving the dispersion stability of the fine particles can be added to the ultraviolet curable coating material (A).

The ultraviolet curable coating material (A) described above is
It is also available as a commercial product. Specific examples thereof include Catalyst Chemical's trade name ELCOMP4560, Sumitomo Osaka Cement's trade name R310, and the like.

The method of applying the coating material to the film is not particularly limited, and for example, brush coating, bar coating, flow coating, spray coating, knife coating, roll coating, die coating and the like can be applied. The thickness of the applied coating film is preferably 1 to 20 μm after the solvent is dried. A thickness of 1 μm or more is preferable from the viewpoint of antistatic ability, and a thickness of 20 μm or less is preferable from the viewpoint of reduction of coloration of the coating film and ease of subsequent drying.

In the present invention, after the coating material (A) is applied to the film in the first step, the coating film is dried in the second step. From the viewpoint of drying efficiency and safety, this drying is preferably performed with hot air at 50 ° C to 200 ° C. The drying is performed until the solvent content of the coating film made of the ultraviolet curable coating material (A) becomes 10% by mass or less.
When the content of the solvent exceeds 10% by mass, the antistatic ability is likely to decrease in the next third step due to the disturbance of the coating film and the permeation of the ultraviolet curable coating material (B) which comes into contact with the coating film. Further, this drying is more preferably performed until the solvent content of the coating film made of the ultraviolet curable coating material (A) becomes 5% by mass or less.

In the present invention, after drying in the second step, in the third step, the dry coating film composed of the ultraviolet curable coating film (A) is used as the mold side, and the ultraviolet curable coating material (B) is used. ) Is attached and the film is stuck to the mold.

UV curable coating used here (B)
Does not contain conductive fine particles and contains substantially no solvent. As the ultraviolet curable coating material (B), for example, a composition containing a monomer or an oligomer having two or more (meth) acrylate groups in one molecule and a photoinitiator is used. 2 or more (meta) in this 1 molecule
Examples of the monomer or oligomer having an acrylate group include those similar to the above-mentioned examples used for the ultraviolet curable coating material (A). Incidentally, the term "substantially free of solvent" means that no solvent is added for the purpose of reducing the viscosity of the ultraviolet curable coating material,
1% by mass that may be contained as an impurity in the monomer
It is meant to allow the inclusion of a moderate amount of solvent.

As the photoinitiator, the same photoinitiators as those mentioned above as the photoinitiator used in the ultraviolet curable coating material (A) can be used, but particularly, the film and the ultraviolet curable coating material (A).
It is preferable to use a photoinitiator having a sensitizing wavelength of 360 nm or more in order to achieve good curing when it is cured with UV light through the. As the photoinitiator having a sensitizing wavelength of 360 nm or more, an acylophosphine-based initiator such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide or benzoyldiethoxyphosphine oxide is a curable compound, This is the most preferable because it is difficult for the coating film of (3) to color. The amount of the photoinitiator added is 0.1 in the ultraviolet curable paint (B) from the viewpoint of curability by ultraviolet rays.
The amount is preferably 1% by mass or more, and is preferably 10% by mass or less from the viewpoint of maintaining a good color tone of the coating film.

The UV-curable coating material (B) contains, if necessary, a monomer having one functional group in the molecule, a leveling agent, inorganic fine particles having no conductivity, a UV absorber, and a light stabilizer. Various components such as can be further added. The addition amount is 1
It is preferably 0% by mass or less.

As a method of attaching the film to the mold,
For example, UV-curable paint (B) on the mold or film
And a pressure-bonding with a rubber roll. In particular, in order to prevent the entrapment of air at the time of bonding, apply an excessive amount of the ultraviolet curable coating (B) on the mold,
A method of sticking while squeezing out excess paint with a rubber roll is preferable.

The thickness of the UV-curable coating material (B) layer is preferably 10 μm or less after curing. If this thickness is too large, sufficient antistatic performance cannot be obtained. In addition, the thickness after curing is 0.5 μm in order to prevent the occurrence of defects during film attachment.
The above is preferable.

In the present invention, after the film is attached to the mold in the third step, as the fourth step, ultraviolet rays are radiated through the film, and the ultraviolet curable coating material (A) and the ultraviolet curable coating material ( Cure B). An ultraviolet lamp may be used for this ultraviolet irradiation. Examples of the ultraviolet lamp include a high pressure mercury lamp, a metal halide lamp, and a fluorescent ultraviolet lamp. Curing by ultraviolet irradiation may be performed in one step through the film, for example,
The curing may be performed in two steps, such as pre-curing through the film (fourth step), peeling the film (fifth step), and then further irradiating with ultraviolet rays to cure.

In the present invention, after the curing in the fourth step, the film is peeled off leaving the cured coating film on the mold as the fifth step, and the sixth step is to mold the mold with the cured coating surface of the mold as the inner surface. It is produced and cast polymerization is further performed as the seventh step.

As the member constituting the mold, for example, a stainless plate having a mirror surface, a glass plate, or a stainless plate having a surface irregularity, a glass plate, etc. can be used. The mold is prepared by, for example, inserting soft polyvinyl chloride, ethylene-vinyl acetate copolymer, polyethylene, ethylene-methyl methacrylate copolymer, etc. as a gasket between two molds and fixing them with a clamp. The process can be performed by assembling a mold including a molding die. Further, as a method of continuously performing cast polymerization, a method of performing cast polymerization of a resin raw material between two stainless steel endless belts running in opposition is known.
In this case, a resin plate such as an acrylic resin laminate can be manufactured by forming a crosslinked film on the surface of the steel belt, which is the most preferable method in terms of productivity.

When cast polymerization (casting polymerization) of the resin raw material is performed inside the prepared mold, various conventionally known raw materials can be used as the resin raw material. For example, when an acrylic resin molded body is produced by cast polymerization, the resin raw material is composed of a monomer containing (meth) acrylic acid esters as a main component, or this monomer and this monomer. Examples thereof include syrup containing a mixture of polymers. Further, examples of such an acrylic resin include homopolymers and copolymers containing (meth) acrylic acid esters as main monomer components. Examples of esters of (meth) acrylic acid include methyl methacrylate. For example, when methyl methacrylate is the main monomer component, the copolymerization monomer components include acrylic acid esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. Methacrylic acid esters such as cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate; styrene, α
-Aromatic vinyl compounds such as methylstyrene and p-methylstyrene; and the like.

When the methyl methacrylate partially contains the polymer, the polymer may be dissolved in the methyl methacrylate, or the methyl methacrylate may be partially polymerized. As an initiator for polymerizing the acrylic resin raw material, an azo type initiator and a peroxide type initiator which are generally used can be mentioned, and cast polymerization is carried out by using these in usual amounts. According to other purposes, a release agent, an ultraviolet absorber, a dye or pigment, etc. can be added to the acrylic resin raw material.

After the completion of the polymerization, in a eighth step, the resin molding having a layer made of a cured coating film on its surface is peeled from the mold. The surface layer of the resin molded product thus obtained has an excellent surface free from defects due to foreign matters and the like, and is excellent in scratch resistance and antistatic property because it is a transfer of the mold surface.

If desired, the resin molded body may be provided with another functional thin film such as an antireflection film on the surface thereof. The method for forming the antireflection film is not particularly limited, but examples include Asahi Glass Co., Ltd., trade name CYTOP, JSR
Examples include a method of using a commercially available antireflection coating such as OPSTAR manufactured by Co., Ltd .; a physical vapor deposition method such as a vapor deposition method or a sputtering method.

[0038]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The evaluation in the examples was performed according to the following methods.

(A) Regarding the surface resistance value, a super insulation resistance meter (manufactured by TOA, ULTRA MEGOHMMETER
MODEL SM-10E) is used to measure temperature 23
The surface resistance value (Ω) after 1 minute at an applied voltage of 500 V was measured under conditions of ° C and a measured humidity of 50%. As a sample for measurement, a sample which had been conditioned at 23 ° C. and 50% relative humidity for one day in advance was used.

(A) Haze is Haze M manufactured by Nippon Denshoku
It was measured by ETER NDH2000.

(C) The scratch resistance was evaluated by the change in haze (Δhaze) before and after the scratch test. That is, diameter 2 with # 000 steel wool
A circular pad of 5.4 mm was placed on the surface of the coating film side of the sample, and was rubbed back and forth 100 times at a distance of 20 mm under a load of 9.8 N. )
I asked more. [△ haze (%)] = [haze value after scratching (%)]-[haze value before scratching (%)] (1).

(D) The total light transmittance (%) was measured by Haze METER NDH2000 manufactured by Nippon Denshoku.

<Example 1> Thickness 50 having a smooth surface
On a polyethylene terephthalate (hereinafter referred to as "PET") film of μm, as an ultraviolet curable coating material (A), 70 mass% of a solvent containing isopropanol as a main component and antimony pentaoxide fine particles 25 having an average particle size of 20 nm in the components other than the solvent 25 A polyfunctional acrylate-based coating material (ELCOM P4560 manufactured by Catalysts & Chemicals Corporation) containing mass% was applied to a thickness of 25 μm using a bar coater. Next, the coating film on this film was dried in a hot air drying oven at 70 ° C. for 5 minutes. A part of the dried coating film was sampled and the amount of residual solvent in the coating film was examined. As a result, the solvent content was 1% by mass or less.

On the other hand, succinic acid /
Trimethylolethane / acrylic acid molar ratio 1: 2: 4
The ultraviolet curable coating material (B) consisting of 50 parts by mass of the condensation mixture of 50 parts by mass of 1,6-hexanediol diacrylate and 1.5 parts by mass of 2,4,6-trimethylbenzoyldiphenylphosphine oxide was applied.

On the coating film of the ultraviolet curable coating material (B) on this glass plate, a PET film was placed with the dry coating film surface of the ultraviolet curing coating material (A) as the inner side, and a ultraviolet ray was applied using a rubber roll of JIS hardness 40 °. The curable coating material (B) was pressure-bonded so as not to contain air bubbles while squeezing out the excess coating material so that the thickness was 10 μm. Next, with this PET film side facing up, the position of 20 cm below the fluorescent ultraviolet lamp (FL40BL made by Toshiba) with an output of 40 w is 0.3 m / mi.
Both coatings were precured by passing through at a speed of n.
Then, the PET film was peeled off, leaving the pre-cured coating film on the mold. Then, the pre-cured coating film surface of the glass plate was turned upward, and the coating film was further cured by passing it through a position of 20 cm under a high pressure mercury lamp having an output of 30 w / cm at a speed of 0.3 m / min.

Two glass plates having a cured coating film thus formed were prepared, faced so that the cured coating film was on the inside, and the periphery was sealed with a gasket made of soft polyvinyl chloride. A mold was prepared. In this template, 100 parts by weight of a mixture of 20 parts by weight of a methyl methacrylate polymer and 80 parts by weight of a methyl methacrylate monomer, 0.05 part by weight of azobisdimethylvaleronitrile, and a sodium salt of dioctyl sulfosuccinate. A raw material consisting of 005 parts by mass was injected, the interval between the opposing glasses was adjusted to 2 mm, and polymerization was carried out in a water bath at 80 ° C. for 1 hour and then in an air furnace at 130 ° C. for 1 hour. Then, it cooled and the resin plate was peeled from the glass plate to obtain an acrylic resin plate having a cured coating on its surface.

A cross section of the coating film of the obtained resin plate was taken by SEM and X.
After confirming with a line micro-analyzer, 7μ on the surface
m of the ultraviolet curable coating material (B) and a layer of the ultraviolet curable coating material (A) of 5 μm were observed in the inner layer. The resin plate had a total light transmittance of 92% and a haze of 0.2%, and was excellent in transparency. Further, it had a good appearance without any appearance defect due to foreign matter. The surface resistance is 8 × 10 ¹¹ Ω, and the haze increment after scratching is 0.0%.
It was excellent in antistatic property and scratch resistance.

Example 2 An acrylic resin plate having a cured coating on its surface was obtained in the same manner as in Example 1 except that the coating thickness of the ultraviolet curable coating material (B) was 7 μm. When the coating film cross section of the obtained resin plate was confirmed by SEM and an X-ray microanalyzer, a cured layer of 5 μm UV curable coating (B) on the surface layer and a layer of 5 μm UV curable coating (A) on the inner layer Was observed. The resin plate had a total light transmittance of 92% and a haze of 0.2%, and was excellent in transparency. Further, it had a good appearance without any appearance defect due to foreign matter. The surface resistance value is 2 × 10.
The haze increment after scratching was ¹¹ Ω, and it was excellent in antistatic property and scratch resistance.

<Example 3> 70% by mass of a solvent containing methyl ethyl ketone as a main component was used as the ultraviolet curable coating material (A).
Using a polyfunctional acrylate-based paint (R310 manufactured by Sumitomo Osaka Cement) containing 4% by mass of antimony-doped tin oxide fine particles having an average particle size of 10 nm in all components other than the solvent, and an ultraviolet curable paint ( An acrylic resin plate having a cured coating on its surface was obtained in the same manner as in Example 1 except that the coating thickness of B) was 7 μm. The resin plate thus obtained had a total light transmittance of 91% and a haze of 0.3%, and was excellent in transparency. Further, it had a good appearance without any appearance defect due to foreign matter. The surface resistance is 2 × 10 ¹⁰ Ω, and the haze increment after scratching is 0.1%.
It was excellent in antistatic property and scratch resistance.

Example 4 An acrylic resin plate having a cured coating on its surface was obtained in the same manner as in Example 1 except that the coating thickness of the ultraviolet curable coating material (B) was 20 μm. The resin plate thus obtained had a total light transmittance of 92% and a haze of 0.2.
%, And was excellent in transparency. Further, it had a good appearance without any appearance defect due to foreign matter. When the cross section of the coating film of the resin plate was confirmed by SEM and an X-ray microanalyzer, a cured layer of 15 μm UV curable coating (B) was observed on the surface layer and a layer of 5 μm UV curable coating (A) was observed on the inner layer. And the surface resistance is 3 × 10 ¹³ Ω
In comparison with the other examples, the antistatic property was slightly inferior.

Comparative Example 1 First, a film having a coating film of the ultraviolet curable coating material (A) was prepared in the same manner as in Example 1. This film was directly laminated on a glass plate serving as a mold without passing through the ultraviolet curable coating material (B), and JIS hardness 40 was applied.
The rubber roll of ° was used for pressure bonding. In this pressure bonding, since the ultraviolet curable coating material (B) was not present, air bubbles remained between the dry coating film of the ultraviolet curable coating material (A) and the glass plate. Further, when pre-curing was carried out in the same manner as in Example 1 and the PET film was peeled off, the coating film after pre-curing was entirely taken off on the PET film side, and a mold with a cured coating film could be produced. There wasn't.

Comparative Example 2 Example except that the temperature at the time of drying the coating film of the ultraviolet curable coating material (A) was lowered to 25 ° C. and the solvent content of the coating film after drying was 20% by mass. An acrylic resin plate having a cured coating on the surface was obtained in the same manner as in 1.
However, the cured coating film of the coating material (A) was disturbed by the ultraviolet curable coating material (B), and the appearance of the cured coating film of the coating material (A) was uneven. Further, the ultraviolet curable paint (B) penetrates into the paint (A), and as a result, the surface resistance value is 3 × 10 ¹³ Ω.
Became.

Comparative Example 3 A mold was prepared using the glass plate as a mold without using either the ultraviolet curable coating layer (A) or the ultraviolet curable coating layer (B), and in the same manner as in Example 1. Cast polymerization of acrylic resin was performed. Since the obtained acrylic resin plate had no coating film on the surface, the surface resistance value was 10 ¹⁶ Ω or more, the haze increment after scratching was 20%, and the antistatic property and scratch resistance were poor. .

[0054]

As described above, according to the present invention, since the mold surface is transferred, it has an excellent surface free from defects such as foreign matters, and exhibits sufficient antistatic property, scratch resistance and transparency. A resin molding having a surface layer (cured coating film) having excellent properties can be produced with high productivity.

Such excellent resin molded products (particularly acrylic resin plates) are used as nameplates for various electric devices, various glazings such as partitions, front plates for various displays such as CRTs, liquid crystal televisions and projection televisions, and liquid crystals for information terminals. It can be suitably used for the front plate of the information display section.

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Claims (2)

[Claims] 1. A first step of applying an ultraviolet curable coating material (A) containing conductive fine particles and a solvent to a film, the coated ultraviolet curable coating material (A) having a solvent content of a coating film. Second step of drying until the content becomes 10% by mass or less, the coating film of the dried UV-curable coating material (A) is used as a mold, and the UV-curability does not contain conductive fine particles and does not substantially contain a solvent. A third step of attaching the film to a mold with a coating material (B) interposed therebetween, and a step of irradiating ultraviolet rays through the film to cure the ultraviolet curing coating material (A) and the ultraviolet curing coating material (B). Four
Step, peeling off the film leaving the cured coating film on the mold
Step of preparing a mold with the cured coating film surface on the mold as the inner surface
A step of performing cast polymerization using the template, and
After the completion of the polymerization, an eighth step of peeling the resin molded product having a layer of a cured coating film on the surface from the mold, the method for producing a resin molded product. 2. The ultraviolet curable coating material (B) is 360 nm.
The method for producing a resin molded product according to claim 1, further comprising a photoinitiator having a sensitizing wavelength.