JPS62231712A - Synthetic resin molded article - Google Patents

Abstract

PURPOSE:To obtain a synthetic resin molded article having the surface which is superior in abrasion resistance and weather resistance, by a method wherein a coating composite containing a hydrolyzate of alkoxysilane containing a (meta)acryloxy group and silica sol is applied to a template, dried through heating and one surface is coated with a cured film of the coating composite by casting base resin raw materials. CONSTITUTION:A coating composite containing hydrolyzate of alkoxysilane containing a (meta)acryloxy group and silica sol is applied to at least one inner surface of a template and is dried beforehand through heating and a thin film is formed. At least one surface of the template, which is molded by a method wherein base resin raw materials are cast into the template and polymerization is applied to the same, is coated with a cured film derived from the coating composite. As a synthetic resin molded article, the cured film of desirably 0.003-0.03mm in thickness of the coating composite is stuck strongly to the surface of base resin, abrasive resistance of the surface is improved drastically and weather resistance becomes favorable also. Then the titled molded article does not have even a poor external appearance such as wrinkles or unevenness and can easily be removed from the template.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a synthetic resin molded article formed with a coating having excellent scratch resistance and weather resistance.

(Prior Art) Currently, many synthetic resin molded products are commercially available in place of molded products made of conventional materials such as glass, metal, and wood, and these have many excellent properties.

However, synthetic resin molded products generally do not have sufficient wear resistance, and if this point is improved, further development is expected.

Now, various methods have been developed to improve the wear resistance of these synthetic resin molded products, but it is difficult to attach a smooth wear-resistant thin film without other hard irregularities to the surface by some method. is considered to be the most effective method for improving synthetic resins without impairing their inherently excellent properties.

As one of these methods, a mixture of Kurihashi monolayers such as allyl methacrylate and ethylene dimethacrylate and 11 is applied to the mold to initiate polymerization, with the aim of simplifying the packaging process. After that, there is a method (Japanese Patent Publication No. 37-9.827) in which a pre-prepared base resin is brought into close contact with the mixture and heated. In this process, air bubbles are easily formed, and it is difficult to remove the air bubbles, which poses a problem in step 1 for industrialization. In addition, a mixture of a crosslinkable suspension such as alkanediol dimethacrylate 1 or diethylene glycol dimethacrylate or triethylene glycol dimecacrylate and its polymerization initiator is applied to a mold and dried to form a thin film, and the base material is There is a method (Japanese Patent Publication No. 35-17.487) in which a resin raw material is injected into the mold and polymerized, but this method does not polymerize the thin film sufficiently, resulting in a thin film. swells or dissolves in the resin raw material, which tends to cause linear cracks at the interface between the surface thin film and the base material. For this reason, there is a method in which a film that has no affinity with the thin film is brought into close contact with the thin film, the thin film is polymerized and cured under oxygen-blocking conditions, only the film is peeled off, and the 11i base resin raw material is injected (Japanese Patent Publication No. 47-13-417,
Japanese Patent Publication No. 49-36.829) was proposed, and furthermore, a crosslinkable polymer having at least three 7-acryloyloxy groups and/or methacryloyloxy groups in one molecule, and each acryloyloxy group and/or A compound in which methacryloyloxy groups are bonded with a saturated hydrocarbon group alone or in a mixture with other polymerizable compounds containing 30% or more of the compound;
No. 51), and after the polymerization and hardening of the thin film has progressed to a certain extent, the film is polymerized and hardened by peeling it off or removing the inert substrate atmosphere (Japanese Patent Publication No. 14, 1983, 617@,
Improvements such as Special Publication No. 54-14.618) have been added. However, these methods are not only complicated to operate, but also because the material used for the thin film is not satisfactory, resulting in a decrease in scratch resistance and adhesion after exposure. The final product has the disadvantage that it tends to have uneven wear resistance.

On the other hand, even in a similar method using an organopolysiloxane coating composition said to have excellent weather resistance, a synthetic resin molded article having a surface with excellent scratch resistance and weather resistance has not been obtained.

This is because it is not possible to obtain a synthetic resin molded product that has a surface with good appearance, sufficient adhesion, and excellent abrasion resistance without surface defects such as whitening and sink marks.

(Problems to be Solved by the Invention) Therefore, an object of the present invention is to provide a novel synthetic resin molded product. Specifically, an object of the present invention is to provide a synthetic resin molded article having a surface with excellent MFj resistance, weather resistance, appearance, etc. through a simple treatment process. Furthermore, it is an object of the present invention to provide a synthetic resin molded product having a surface coated with a coating that has an even resistance to weathering and Ω4 abrasion resistance without reducing scratch resistance or adhesion after exposure. shall be.

(The best way to resolve the issue) The above terms are as follows:
A coating composition containing hydrated molecules of (meth)acryloxysilane and silkasol is applied to at least one inner surface of the mold, caulked, and dried by heating to form a thin 1-mold mold. After forming, a synthetic resin molded product characterized in that at least one surface is covered with a cured film derived from the above coating composition, which is formed by injecting a base 4M resin raw material into a mold and polymerizing it. achieved.

(effect) The present invention will be explained in more detail below.

The synthetic resin molded product of the present invention is molded by cast polymerization, and the new coating composition is applied to the inner surface of the mold before injecting the base resin raw material, and must be heated first. Excellent surface properties are imparted by drying and forming aIla on the inner surface of the mold, then injecting base resin stock 31 and performing general casting polymerization.

The (meth)acryloxy-containing alkoxysilane hydrolyzate contained in the coating composition used to produce the synthetic resin molded article of the present invention has the general formula 1, 2n R' -3i -(OR3) 4 -IIl-o(I
)((ILL, where R1 is the same or different alkyl having 1 to 4 carbon atoms, preferably 3 to 4 carbon atoms, substituted with an acryloxy group or methacryloxy group, and R2 is the same or different alkyl having 1 to 8 carbon atoms, preferably 1 ~6 same or different alkyl, alkenyl, phenyl, R3 has 1 to 5 carbon atoms
, preferably 1 to 4 same or different alkyl, alkoxyalkyl, and n is O to 2, preferably O
~], m is an integer of 1 to 3, preferably 1 to 2, and m10≦3. ) and the like. Examples of the compound represented by the general formula (I) include acryloxymethyl-1-rime-1-xysilane, acryloxymethyl (methyl)tsume-1-gishsilane, acryloxymethyl (dimethyl)methoxysilane,
Acryloxymethyl (ethyl)dimethoxysilane, β-acryloxydiyltrimethoxysilane, β-acrylogyethyl(ethyl)dimethoxysilane, β-7cryloxyethyl(ethyl)dimethoxysilane, dimethyl)methoxysilane, β-acryloxyethyltriethoxysilane, γ-acryloxypropyltrimethoxysilanerutriethoxysilane, γ-7cryloxypropyl(methyl)dimethoxysilane, γ-acryloxypropyl(
dimethyl)methoxysilane, γ-acryloxypropyl(dimethyl)ethoxysilane, γ-acryloxypropyl(vinyl)dimethoxysilane, γ-acryloxypropyl(phenyl)tume 1-xysilane, γ-acryloxypropyltri(methoxydiethoxy) ) silane, δ-acryloxybutyl 1-helymethoxysilane, δ-acryloxybutyl 1-rie 1-xysilane, δ-acryloxybutyl(methyl)dimethoxysilane, δ-acryloxybutyl(dimethyl)methoxysilane, bis(7) Acryloxymethyl) Tsume 1-xysilane, bis(acryloxymethyl)jethoxysilane, bis(acryloxyethyl)dimethoxysilane, bis(acryloxyethyl)jethoxysilane, bis(acryloxypropyl) Tsume 1-xysilane, bis (acryloxypropyl)jetoxysilane, tris(acryloxymethyl)methoxysilane, tris(acryloxymethyl)ethoxysilane, 1-lis(acryloxyethyl)methoxysilane, 1-lis(acryloxyethyl)methoxysilane , tris(acryloxypropyl>methoxysilane, 1-lis(acryloxypropyl)ethoxysilane, methacryloxymethyl 1-dimethoxysilane, methacryloxymethyl(methyl)dime)xysilane, methacryloxymethyl(dimethyl)methoxysilane , methacryloxymethyltriethoxysilane β-methacryloxyethyl trime 1-xysilane, β-methacryloxyethyl 1-rie 1-xysilane, β-methacryloxyethyl (methyl) dimethoxysilane, β-methacryloxyethyl (ethyl) trime 1 ~Xysilane, β-methacryloxyethyl (dimethyl)meth1
~xysilane, γ-methacryloxypropyl 1-rimethoxysilane, γ-methacryloxypropyl 1-ethoxysilane, γ-methacryloxypropyl (methyl) dimethoxysilane, γ-methacryloxypropyl (dimethyl) methoxysilane , γ-methacryloxypropyl (dimethyl) ethoxysilane, γ-methacryloxypropyl (vinyl) 1-xysilane, γ-methacryloxypropyl (phenyl) dimethoxysilane, γ-methacrylo-mainly dipropyltri(methoxyethoxy)silane, δ-methacryloxy Butyltrimethoxysilane, δ-methacryloxybutyltriethoxysilane, δ-methacryloxybutyl(methyl)dimethoxysilane, δ-methacryloxybutyl(dimethyl)m-1-xysilane, bis(methacryloxymethyl)dis-l-xysilane, bis (methacryloxymethyl)jethoxysilane, bis(methacryloxyethyl)dimethoxysilane, bis(methacryloxyethyl)jethoxysilane, bis(methacryloxypropyl)dimethoxysilane, bis(methacryloxypropyl)die)-xysilane, tris( (methacryloxymethyl) methoxysilane, 1-soot (methacryloxyethyl)
Examples include 1-xysilane, tris(methacryloxyethyl)methoxysilane, 1-lis(methacryloxyethyl)ethoxysilane, 1-lis(methacryloxypropyl)methoxysilane, and tris(methacryloxypropyl)ethoxysilane.

Hydrolysates of (meth)acryloxy group-containing alkoxysilanes include those in which a part or all of the alkoxy-filled or alkoxyalkoxy groups of the above-mentioned (meth)acryloxy group-containing alkoxysilanes are substituted with hydroxyl groups, and water f[including those in which 4 comrades are partially combined lυ
I'm here. These hydrolyzed preforms are produced, as is known, by adding pure water or an acidic aqueous solution such as hydrochloric acid and stirring the mixture.

These (meth)acryloxy group-containing alkoxysilane hydrolysates may be used alone or in combination of two or more. This (meth)acryloxy group-containing alkoxysilane is usually contained in the coating composition in an amount of 2 to 40% by weight, preferably 3 to 35% by weight in terms of solid content. That is, if it is less than 2% by weight, the adhesion between the cured film and the base resin will not be sufficient in the resulting synthetic resin molded product, while if it exceeds 40% by weight, the base material will not be adhered to during production. This is because there is a risk that defective peeling between the resin and the mold may occur and a synthetic resin molded product with a good appearance may not be produced.

In addition, the silica sol contained in the coating composition is
It is a colloidal solution in which fine particles of silicic anhydride, preferably fine particles with a particle size of 1 to 100 millimicrons, are dispersed in a dispersion medium, for example, an organic dispersion medium such as water or alcohol.
It is manufactured by a well-known method and is commercially available. The solid content in the silica sol is approximately 20 to 40% of the total mold opening.

This silica sol is usually contained in the coating composition in an amount of 10 to 70 wt M%, preferably 20 to 65 wt M%, in terms of solid content. In other words, if the lifting weight is less than 10 times, the abrasion resistance (especially taper wear) of the resulting synthetic resin molded product will not be sufficiently improved, and the weather resistance will also be poor. This is because if there is a problem, there is a possibility that the film formation will not be completed completely during manufacturing.

In addition, in the coating composition used for producing the synthetic resin molded article of the present invention, in addition to the hydrolyzate of the (meth)acryloxy group-containing alkoxysilane and the silica sol component, any other alkoxysilane may be added. Contains silane hydrolyzate.

Other hydrolysates of alkoxysilanes include, for example, general formula (It) R1゜-3i (OR5) 4-Q (II
) (In the formula, R4 is the same or different alkyl having 1 to 6 carbon atoms, cycloalkyl, alkenyl,) engineering or a substituted derivative thereof such as halogen, amine, epoxy, glycide, glycidyl, mercap 1 henna, etc. , R5
is the same or different alkyl, alkoxyalkyl of carbon@1 to 5, preferably 1 to 4, or q is O to 3
is an integer. ) There is a hydrolyzed product of the compound represented by Specific examples of the compound represented by the general formula 11 include 1-lymethylmethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, tetrabutoxysilane, tetrabutoxysilane, tetrapropoxysilane, tetrabutoxysilane, and methyltriethoxysilane. Silane, dimethyldimethoxysilane, 1-limethylethoxysilane, phenyl-1-helyethoxysilane, cyphenyldie-1-xysilane, phenyl(methyl)jethoxysilane, vinyl 1-ethoxysilane, vinyl(methyl)
Triethoxysilane, vinyltris(β-methoxyethoxy)silane, γ-chloropropyl 1-rime) xysilane, γ, γ.

γ-1-Lifluoropropyltrimethoxysilane γ-mercaptopropyltrimethoxysilane-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyl-1-rimethoxysilane, N-bis(β-
hydroxyethyl)-γ-7 minopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyl(methyl)dis1-xysilane, γ-glycidoxypropyl1-rimethoxysilane, γ-glycidoxy Bropyl 1-ethoxysilane, γ-glycidoxypropyl (
methoxyethoxy)silane, γ-glycidylpropyltriethoxysilane, 3,4-epoxycyclohexylpropyltrimethoxysilane, and the like.

Other hydrolyzed m-products of alkoxysilanes include (meth)acryloxy groups, as in the case of the 110-hydrolyzate of alkoxysilanes, as described above. is substituted with a hydroxyl group and substituted r
Contains some hydroxyl groups condensed together. These hydrolysates are produced, as is known, by, for example, adding pure water or an acidic aqueous solution such as hydrochloric acid and stirring.

These other alkoxysilane hydrolysates are
Can be used alone or in combination of two or more. The hydrolyzate of other alkoxysilanes is usually contained in the coating composition in an amount of 10 to 88% by weight, preferably 15 to 70% by weight in terms of solid content. This is because if it deviates from this range, the effect of the hydrolyzate of the (meth)acryloxy group-containing alkoxysilane in the coach ink composition may be inhibited. Therefore, the total amount of the (meth)acryloxy group-containing alkoxysilane, silica sol, and other alkoxysilanes is 100% by weight in terms of the solid content of the coating composition.

In curing the above coating composition, various curing agents can be used for the purpose of accelerating curing.

Examples of these curing agents include ammonium perchlorate, perchloric acid, hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, sulfonic acid, paratoluenesulfonic acid, boron trifluoride and its complex with an electron donor, 5nC14 , ZnC1z, FeC
l3, AlCl3.5bC1s, T! Lewis acids and their complexes such as CI 4, metal salts of organic acids such as sodium acetate, zinc naphthenate, cobalt naphthenate, tin octylate, tin octylate, metal salts of fluoroborates such as zinc borofluoride and tin borofluoride, boron Boric acid organic Nisderates such as ethyl acid and methyl borate, alkalis such as sodium hydroxide and potassium hydroxide, titanate esters such as tel~rhabdoxytitanium and tetraisopropoxytitanium, glomoacetylacetonate 1-, Titanylacetylacetonate, aluminum acetylacetonate-1, metal acetylacetonates such as cobalt acetylacetonate, nickel acetylacetonate-1, n-butylamine, di-n-butylamine, 1 Examples include amines such as n-butylamine, guanidine, biguanide, and imidazole. Among these curing agents, amine curing agents such as trilobylamine are particularly preferred.

In addition, the coating composition is usually diluted to a concentration suitable for application before use. Examples of solvents that can be used include alcohols, ketones, ethers, cellosolves, esters, halides, carboxylic acids, aromatic compounds, aliphatic hydrocarbons, etc. It can be used as a species or a mixture of two or more.

Among these solvents, particularly preferred are lower alcohols such as methanol, ethanol, n-propatool, isopropatool, n-butanol, 5ec-butanol, and tert-butanol, and cellosolves such as methyl cellosolve, ethyl cellosolve, and butyl cellosolve. , lower carboxylic acids such as formic acid, acetic acid, propionic acid, butylene M, aromatic compounds such as toluene, xylene, etc., and esters such as ethyl acetate, butyl acetate, etc., or a mixture of two or more thereof. .

In the coating composition, if necessary, IJ
Is it possible to add a leveling agent to improve the friction coefficient of JA's face? As a leveling agent, a commercially available fluorine-based surfactant such as FC-431 (trade name) manufactured by Sumitomo 3M, or 1.-Resilicone Company ¥'! 4
A silicone surfactant such as SH-28 (trade name) can be used.The amount of these leveling agents added may be small, and it is sufficient to add 0.01 to 100% of the total composition.
Approximately 5% weight is sufficient.

Furthermore, it is optional to include anti-deterioration agents such as ultraviolet absorbers and antioxidants, four-color agents such as pigments and dyes, and fillers such as alumina sol, graphite, glass fiber, and carbon fiber. be.

On the other hand, the base resin on which the cured film derived from such a coating composition is applied is not particularly limited as long as it is a synthetic resin that can generally be cast polymerized, but acrylic resin 1, allyl diglycol, etc. Carbonate and styrene resins are preferred, especially methyl methacrylate L4.
A copolymer with other copolymerizable monomers containing methyl methacrylate as a main component, and t'cR-39
Diethylene glycol bisallyl carbonate, known as J, is preferred. Therefore, as the base resin raw material used in the production of the synthetic resin molded article of the present invention, monomers or partial polymers of the above-mentioned synthetic resins that can be cast in a liquid state at normal pressure are used. For example, in the case of acrylic synthetic resin, alkyl (meth)acrylate, etc.
meth)acrylate alone or a mixture of two or more alkyl(meth)acrylates or other copolymerizable monomers based on alkyl(meth)acrylates, such as hydroxy(meth)acrylate, (meth)acrylic acid, The base material is a mixture with (meth)acrylic M salt, vinyl chloride, vinyl acetate, (meth)acrylonitrile, (meth)acrylamide, styrene, α-methylstyrene, vinyltoluene, maleic anhydride M, etc., or a partial polymer thereof. It becomes a raw material for resin.

As the polymerization initiation Δ11 of the base material tree 118 and raw material 31, a known radical polymerization initiator such as an oil-soluble peroxide or an azo compound can generally be used. Also, if necessary,
It is also possible to add auxiliary agents or additives such as plasticizers, flame retardants, colorants, ultraviolet absorbers, etc. to the base resin raw material.

The synthetic resin molded article of the present invention is manufactured, for example, in the following manner using the coating composition described above and the base material tree 11u raw material 1.

First, the coating composition as described above is coated onto the inner surface of a commonly used mold made of stainless steel, inorganic glass plates, etc., using an appropriate method such as brushing, spraying, or using a roll coater to prevent bubbles or unevenness. It is applied evenly.

At this time, it is not always necessary to apply the coating composition to the inner surface of the mold; for example, when trying to obtain a resin molded product with high wear resistance on only one side, , it is sufficient to apply the coating composition to one inner surface of the corresponding mold. Next 100'~1
Dry by heating at 20℃ for about 5 to 10 minutes! A thickness of 0.003 to 0.03 mm, preferably 0.03 mm, is applied to the inner surface of the mold.
A thin film having a thickness of 0.005 to 0.02...m is formed. next,
Assembling the mold in which a thin film is formed on at least one inner surface,
During this time, a mixture of the base resin raw material and the polymerization initiator as described above is injected. The base resin raw material is polymerized by a conventional method.
After that, when the molded product is peeled from the mold, a synthetic resin molded product with the cured film transferred from the mold attached to its surface is obtained.

The synthetic resin molded product of the present invention produced in this way is
A cured film derived from the above coating composition, preferably a 0.003 to 0.03 mm 1'f-thick cured film, adheres strongly to the base resin surface, and this cured film improves the scratch resistance of the surface. It has been significantly improved, and even after long-term exposure, there is almost no change in scratch resistance, adhesion, etc., and weather resistance is also good. This surface also has fine wrinkles,
There are no appearance defects such as unevenness, the surface of the mold can be completely copied, and it is easy to remove from the mold.

(Example) Hereinafter, the present invention will be described in more detail with reference to Examples.

The performance of the synthetic resin molded products obtained in Examples and Comparative No. 91 was examined by the following method.

Adhesion Adhesion was determined by a base plate test, and the percentage of the area that did not peel off was expressed as a percentage.

肚鼠控 U Is the scratch resistance constant by using #OOO steel wool jig on the surface of the test piece? Press under +Fi weight (100 [J/Cll1) -1 at a constant speed 50 times (slip) The difference in haze value before and after 1 scratch was taken as the abrasion value.The haze value is expressed by the following formula. Let's go.

Weatherability The weather resistance test was performed using an ultraviolet exposure tester (manufactured by Toyo Seiki).

ALTAS -UVC0N) Humidity control 50°C 415 →
Exposure to ultraviolet rays at 70° C. was carried out for 700 hours at an 8-hour cycle, and appearance, adhesion, and i4 scratch resistance were tested.

Example 1 Coating composition containing 20% solids containing 11 methyl to 45 parts of xysilane, 1 to 1 part of γ-methacryloxypropyl to 5 parts of xylan, and 50 parts by weight of methanol silica sol (all calculated as solid content) Apply the material to one side of the glass plate with an applicator until the thickness of the surface thin film is 0.005111.
Apply evenly to 1n! 5 and 12 in A-an
1 loss for 5 minutes at 0'C! After drying, two pieces of glass were placed facing each other so that the surface thin film was on the inside, and a methyl meccrylate partial polymer containing 0.5% azoisobutyronitrile was injected between them to soften the surrounding area. The resin plate was sealed with a vinyl gasket, the distance between the mold glasses was adjusted so that the resin plate had a thickness of 5 mm, and polymerization was carried out by heating at 60° C. for 8 hours and then at 120° C. for 2 hours. When the obtained polymeric resin plate was peeled from the glass plate after cooling, the surface thin film was completely transferred to the methacrylic resin plate, and a resin plate was obtained that had a clean surface with no irregularities and no optical distortion. The adhesion of this resin plate was measured and it was found to be 100% adhered, and the abrasion resistance of the methacrylic resin plate without such coating was 19%, whereas this The abrasion value of the resin plate in the example is O-0.1%,
was in an almost unbelievable state. In addition, as a result of the weather resistance test, there was no abnormality in appearance, adhesion was 100%, and abrasion resistance was 0%.
There was no performance deterioration in both adhesion and scratch resistance, compared to commercially available products (
For example, the drop in performance for silicone coatings applied to molded parts is 0.5 to 1%, 5 to 10% for acrylic coatings applied to molded parts, and 1 to 2% for acrylic coatings applied by mold application. I was pretty disappointed. ) showed excellent weather resistance.

Examples 2 to 5 and Comparative Examples 1 to 4 Resin plates were manufactured in the same manner as in Example 1 using coating compositions having the formulations shown in Table 1. The performance of the obtained resin plate was examined in the same manner as in Example 1.

In Examples 2 to 4, the surface thin film was completely transferred to the methacrylic resin plate, and resin plates with no unevenness and a clean surface without optical distortion were obtained, and from the results shown in Table 1. As is clear, the adhesiveness was 100% and the abrasion resistance was Q%. On the other hand, as is clear from Table 1,
In Comparative Examples 1 and 3, the adhesion of the thin film could not be obtained, in Comparative Example 2, the surface thin film was transferred to 1#I oil but had a high taper wear value, and cracks occurred in the weather resistance test, and in Comparative ll944. In all cases, it was not possible to obtain a satisfactory synthetic resin molded product due to the inability to form a film.

Example 6 The coating composition shown in Example 1 was sprayed onto one side of a glass mold for eyeglass lenses until the thickness of the surface thin film was 0.00.
Apply it evenly to a thickness of 5 mtn and heat it in the oven for 1 minute.
After heating and drying at 00'C for 5 minutes, assemble two male and female glass molds facing each other with the thin surface film on the inside at the desired spacing using gaskets. (IPP) monolayer of diethylene glycol and sallyl carbonate containing 3.0% (
PPG Corporation rcR-39J) was injected, the temperature was gradually raised to 100'C in an electric furnace, and polymerization was completed over 18 hours. In the lenses obtained by releasing the mold after cooling, the thin film on the surface completely transfers to the lens surface, the surface sufficiently transfers the shape of the mold, and the lens has excellent optical properties and does not get scratched even by friction with steel wool. I was given 1q.

(Leaving space below) Encounter L-2 L-j kesa Example 2 Example 3 Example 4 Example 5
Silica sol Menal ethyl ketone Silica sol: Catalytic molding Solid content 3
0% Particle size 10-20mμ Comparative example 1 Comparative example 2
Comparative example 3 Comparative example 4- 0.1
− −1 Membrane crack occurrence −−: Methyltriethoxysilane.

(Effects of the Invention) As described above, the present invention applies a coating composition containing a hydrolyzate of a (meth)acryloxy group-containing alkoxysilane and silcasol to at least one inner surface of a mold, and heat-dries it in advance. A synthetic resin molded article characterized in that at least one surface is covered with a cured film derived from the coating composition, which is formed by forming a thin film, injecting a base resin raw material into a mold, and polymerizing it. Therefore, the product is excellent in i9 scratch resistance, appearance, and weather resistance without any deterioration in scratch resistance and adhesion after exposure. Therefore, according to the present invention, for example, scratches may occur on automobile glazing (inset windows), exterior parts, various outdoor covers, architectural glazing, domes, etc. due to collisions with dust, mops, wipers, etc. during cleaning or car washing. It is possible to provide a synthetic resin molded product that suppresses the occurrence of scratches and maintains transparency or gloss for a long period of time. In addition, for eyeglass lenses, camera lenses, etc., especially for complex shapes such as multifocal lenses, we can prevent defects such as uneven coating, sagging, and spots that occur when applying hardened paint to molded products by dipping or spraying. Not only can a product with a good appearance be obtained by removing the scratches, but by eliminating the hard film, the scratch resistance, chemical resistance, bending crank resistance, etc. can be greatly improved. In addition, the synthetic resin molded product of the present invention does not require any complicated processing steps, and is advantageous in terms of manufacturing because it can be formed simultaneously with molding by making slight changes to the general cast polymerization method. It is.

Patent applicant: Kyowa Gas Chemical Industry Co., Ltd. Patent applicant: Nippon Kika Co., Ltd.

Claims (3)

[Claims] (1) A coating composition containing a hydrolyzate of a (meth)acryloxy group-containing alkoxysilane and silcasol is applied to at least one inner surface of a mold, and after being heated and dried in advance to form a thin film, a base resin raw material is applied. 1. A synthetic resin molded article, characterized in that at least one surface thereof is covered with a cured film derived from the above-mentioned coating composition, which is injected into a mold and molded by polymerization. (2) The synthetic resin molded article according to claim 1, wherein the cured film has a thickness of 0.003 to 0.03 mm. (3) The synthetic resin molded article according to claim 1, wherein the base material is an acrylic resin, an allyl diglycol carbonate resin, or a styrene resin.