JPH01185336A - Synthetic resin molding - Google Patents

Abstract

PURPOSE:To obtain the title molding excellent in durability, stain resistance and appearance, by forming a film based on a silane compound and an acryl resin on the surface of a synthetic resin base and heat-treating this film. CONSTITUTION:The surface of a synthetic resin base comprising, e.g., a vinyl chloride resin formed by adding at least 20pts.wt. plasticizer to 100pts.wt. vinyl chloride resin is coated with a mixture of a silane compound having Si-bonded hydrolyzable groups, such as an aminoalkylalkoxysilane or a tetraalkoxysilane with an acryl resin obtained by (co)polymerizing an alkyl (meth)acrylate with, optionally, an alkenylbenzene monomer and a copolymerizable alpha,beta-ethylenically unsaturated monomer at a weight ratio of 20/1-1/15 in a coating weight of 0.05-20g/m<2>. This film is heat-treated at 50-200 deg.C for 10sec-60min by hot-air heating, (far)infrared heating or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a synthetic resin molded article formed by subjecting a base material to surface treatment. More specifically, the present invention relates to synthetic resin molded products with excellent stain resistance and durability.

``Prior Art'' Conventionally, synthetic resins have been used in various fields, but they have the disadvantage of being easily contaminated. For example, when a desk cloak or document holder made of synthetic resin is used to hold documents copied using an electrostatic copying machine, thermal copying machine, etc., or when these documents are stored inside, the printed surface of the paper If the printer comes into contact with the transparent cover of a desk mat or document holder, the printing ink will transfer to the cover in a very short time, contaminating the cover, and even cause problems such as both sides sticking together and damaging the document. Ta. In particular, when the synthetic resin is soft vinyl chloride PS resin, the above phenomenon is noticeable because the plasticizer bleeds out onto the surface of the molded product.

In addition, when a molded product made of vinyl chloride resin comes into contact with a molded product made of other resins, such as ABS If resin or styrene resin, the plasticizer migrates and contaminates the other resin molded products with which it comes into contact. was there.

As a way to solve these problems, vinyl chloride j1%
A method has been proposed in which the surface of a synthetic resin molded product containing resin is coated with a specific resin or paint. For example, Vj, JP-A No. 56-74156 proposes a method of coating an epoxy resin coating composition on the surface of a synthetic resin molded article to form a film. Also, JP-A-58-57954, JP-A-Sho 5
No. 9-176330 and Japanese Patent Publication No. 59-38105 disclose a method of V-imitating a fluororesin coating composition, and JP-A-59-105057 discloses a method of forming a film from a silicone resin coating composition. Proposed.

However, since the films formed on the surfaces of molded products according to the above improved method are mainly made of thermoplastic resin, it is not possible to completely suppress surface contamination when the ambient temperature is high during use. It was difficult and there are still problems.

Therefore, in order to further improve the above-mentioned defects and corrections, we
9-12701 proposes a method of forming a crosslinked acrylic rubber layer on the surface.

Further, Japanese Patent Publication No. 57-57485 proposes a method of forming a film of a cured silicone resin on a surface under light irradiation. However, the coatings obtained by these methods are hard and brittle, and cannot follow the deformation of the molded product that is the base material, causing cracks in the coating and peeling and detachment over time, resulting in stable stain resistance over a long period of time. There was a problem that the effect could not be fully demonstrated.

[Problems to be Solved by the Invention] The present inventors have aimed to solve the above-mentioned conventional drawbacks and provide a synthetic resin molded product that effectively prevents contamination on the surface of the molded product. As a result of intensive study, the present invention has been completed.

``Means for Solving the Problems'' The present invention solves the problem described in 1 above by applying a silane compound having a hydrolyzable group directly connected to a silicon atom and a specific acrylic resin as main components to the surface of a synthetic resin base material. This problem is solved by forming the film under heat treatment.

The present invention will be explained in detail below.

The synthetic resin in the present invention is not particularly limited, and may be selected from thermoplastic resins and thermosetting resins. For example, low density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polyvinyl alcohol, polyvinylidene chloride, saturated polyester, methacrylic resin, AS resin, ABS resin, nylon resin, polyacetal, polycarbonate, polyacrylate,
Polyvinyl acetate, ethylene-vinyl acetate resin, polyphenylene oxide, polysulfone, polyphenylene sulfide, 7-i series 111111t, 7-el resin,
urea resin, unsaturated polyester resin, epoxy resin,
Examples include melamine resin, diallyl phthalate resin, silicone resin, polyimide resin, polyethylene FRP, and the like.

The present invention particularly applies when the synthetic resin is a vinyl chloride resin,
It is effective in preventing surface migration of plasticizers, etc., and preventing contamination on the surface of molded products.

In the present invention, the vinyl chloride resin refers to polyvinyl chloride and a copolymer mainly composed of vinyl chloride. Monomers copolymerizable with vinyl chloride include vinyl esters, vinyl ethers, acrylic acid or methacrylic acid,
and esters thereof, maleic acid or hexamaric acid, and esters thereof, maleic anhydride, aromatic vinyl compounds, halogenated vinylidene compounds, acrylonitrile, methacrylonitrile, ethylene, propylene, and the like. These moamers may be partially crosslinked by adding a trace amount of a compound containing a polyfunctional group. These vinyl chloride resins may be produced by any of conventionally known production methods such as emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization.

Note that the vinyl chloride resin can be used as a single resin (homopolymer), a copolymer resin, or a combination of two or more resins in terms of moldability, strength of the molded product, and the like.

- In order to impart flexibility to the vinyl chloride resin serving as the base, a plasticizer is blended in an amount of 20 parts by weight or more, preferably 30% to 100 parts by weight, based on 100 parts by weight of the resin. By setting the amount of plasticizer in the above range,
Excellent flexibility and mechanical properties can be imparted to the desired soft vinyl chloride molded product.

Examples of plasticizers include di-11-octyl 7-thaletate, di-2-ethylhexyl 7-thaletate, and dibenzyl 7-thaletate.
tallate, butybenzyl 7 tallate, diisodecyl 7
Heptatalytic acid esters such as heptalate, nododecyl heptalate, and dibenzyl heptalate; aliphatic dibasic acid esters such as dioctyl adipate, di-I+-butyl adipate, and dibutyl sebacate; hentaerythritol ester, diethylene glycol dibenzoate, etc. Glycol esters; fatty acid esters such as methyl acetyl ricinoleate; epoxidized oils such as epoxidized soybean oil and epoxidized linseed oil; acetyl tributyl citrate, acetyl trioctyl citrate, t・'j-n-butyl citrate citric acid esters such as trialkyl trimellitate, tetra-low octyl pyromellitate, polypropylene adipate, and other polyester plasticizers. These plasticizers may be used in different types or in combination of two or more types.

In addition to the plasticizer, the vinyl chloride resin may contain, if necessary, known resin additives that are usually added to synthetic resins for molding, such as heat stabilizers, antioxidants, lubricants, and thickeners. Agents, antistatic agents, surfactants, ultraviolet absorbers, light stabilizers, pigments, dyes, etc. can be blended. Therefore, in order to formulate a vinyl chloride resin compound composition for molding by blending other known resin additives including plasticizers, it is necessary to use ordinary blending and mixing techniques such as Bonpregu, Banbury mixer, Super mixer, etc. Methods using other blenders or mixers can be adopted.

There are no particular limitations on the shape of the synthetic resin molded article of the present invention by molding the vinyl chloride resin blended composition. However, due to the ease of forming the film, sheet-like
Film, plate or tubular forms are suitable. These molding methods are appropriately selected from commonly used methods such as calendar molding, extrusion molding, inflation molding, injection molding, and Cast 1 method.

In the present invention, the silane compound [A] refers to silicon 8- It means something that has a hydrolyzable group directly connected to an atom.

Specifically, aminomethyltriethoxysilane, N-β
-aminoethylami7methyltrimethoxysilane, γ-
Aminoalkylalkoxysilanes such as ami/propyltrimethoxysilane, N-()rimethoxysilylprobyl)-ethylenediamine, N-(nomethoxymethylsilylprobyl)-ethylenediamine; γ-glycidoxyprobyltrimethoxysilane, Epoxyalkylalkoxysilanes such as γ-glycidoxypropylmethylnomethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3°4-epoxycyclohexyl)ethylmethyldimethoxysilane; γ
- mercaptoalkylalkoxysilanes such as mercaptopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane; tetramethoxysilane;
Tetraalkoxysilanes such as tetraethoxysilane, tetrabutoxysilane, tritoxyneopentoxysilane, dimethoxyethoxysilane, trimethoxy-11-propoxysilane, dimethoxynoneobenoxysilane, bis(2-ethylhexoxy)jethoxysilane; Alkyltrialkoxysilanes such as methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, and ethyltriethoxysilane; Dialkyldialkoxysilanes such as nomethylnomethoxysilane and dimethylnoethoxysilane: γ-chloropropyltrimethoxysilane , 3.3. Halogenated alkylalkoxysilanes such as 3-trichloropropyltrimethoxysilane; Alkylaciloxysilanes such as methyltriacetoxysilane, dimethyldiacetoxysilane;
Hydrosilane compounds such as trimethoxysilane and triethoxysilane; vinyltrimethoxysilane, vinylethoxysilane, vinyltris (β-methoxyethoxy)
Silane, allyltriethoxysilane, γ-(meth)acryloxypropyltrimethoxysilane, γ-(meth)acryloxypropyltriethoxysilane, γ-(meth)
Examples include monomers or polymers of unsaturated group-containing silane compounds such as acryloxypropylmethyldimethoxysilane, as well as hydrolysates thereof.

The hydrolyzate can be prepared, for example, in the presence of an acid or alkali catalyst,
It is synthesized by adding water to a silane compound having a hydrolyzable group in a combined alcohol system, and it is completely synthesized by adding more than an equivalent amount of water to the silane compound having a hydrolyzable group. An alcoholic silica gel or silica sol or a siloxane composite is obtained by hydrolyzing the mixture, and if less than an equivalent amount of water is added, a partial hydrolyzate is prepared according to the ratio.

Among these silane compounds, especially -formation (R1O)3S
IO8i(OR2), ] (OR') (wherein, R1
--.7R3 each represents the same or different alkyl group, aryl group, alkylaryl group, arylalkyl group, aryloxyalkyl group or alkyloxyalkyl group] 1 represents 0 or a positive integer. ) A monomer or polymer of tetraalkoxysilane shown in ), and a compound obtained by hydrolyzing a hydrolyzable group are preferable. Among these, compounds in which R+ and 2R3 are each represented by the same or different alkyl groups having 4 or less carbon atoms are particularly preferred. .

These silane compounds may be used alone or in combination of two or more.

The acrylic resin in the present invention refers to an alkyl ester of acrylic acid or methacrylic acid (hereinafter referred to as (meth)acrylic acid alkyl ester) monomer alone or a mixture of this and an alkenylbenzene monomer. , and a copolymerizable α,β-ethylenically unsaturated monomer under conventional polymerization conditions.

Examples of the (meth)acrylic acid alkyl esters used in the present invention include acrylic acid methyl ester, acrylic acid ethyl ester, acrylic acid -n7' lobil ester, acrylic acid isopropyl ester, acrylic acid -+1-butyl ester, 2-ethylhexyl acrylate, decyl acrylate, methyl methacrylate, me-12-ethyl acrylate, I+-propyl methacrylate, impropyl methacrylate,
Methacrylic acid-■)-butyl ester, methacrylic acid-
Examples include 2-ethylhexyl ester, decyl methacrylate, etc. Generally, the number of carbon atoms in the alkyl group is 1 to 20.
Acrylic acid alkyl esters and/or methacrylic acid alkyl esters in which the alkyl group has 1' to 20 carbon atoms are used.

Examples of the alkenylbenzenes used in the present invention include styrene, α-methylstyrene, and vinyltoluene.

When using a monomer mixture with such an alkenylbenzene acrylic acid alkyl ester, the amount of the (meth)acrylic acid alkyl ester is usually used, although it depends on the amount of α,β-ethylenically unsaturated monomer used. It is preferable that the proportion used is 10% by weight or more.

Examples of other a.β-ethylenically unsaturated monomers that can be copolymerized to obtain the acrylic resin of the present invention include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, α of acids, crotonic acid, itaconic acid, etc.
, β-ethylenically unsaturated carboxylic acids; α such as ethylene sulfonic acid.

β-ethylenically unsaturated sulfonic acids; 2-acrylamyl'-2-methylpropanoic acid; α,β-ethylenically unsaturated phosphonic acids; acrylamides; amino esters of acrylic acid or methacrylic acid; acrylic acid or Glycyl esters of methacrylic acid: Examples include acrylic acid or methacrylates. These monomers may be used alone or in combination of two or more.

Examples of the polymerization initiator used in producing the acrylic resin of the present invention include persulfates such as ammonium persulfate and potassium persulfate; organic peroxides such as acetyl peroxide and benzoyl peroxide.

These amounts are 0.1% of the total monomer charge10
Used in a range of % by weight.

The acrylic resin can be produced by any polymerization method such as bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization. / Compounds such as vinyl acetate resin, vinyl chloride resin, cellulose ether, etc. can be added and used.

The blending ratio of the silane compound [A] and the acrylic resin FBI is [A] to [B] in a weight ratio of 20:1 to 1:15.
It is preferable that it is within the range of . If the proportion of the silane compound [A] is less than the range specified in 1 or 2, the coating formed on the molded product will become brittle and have poor adhesion to the base material, making it easy to peel off, which is undesirable. Acrylic resin [B
] If the ratio exceeds the above range, the effect of stain resistance will not be significantly exhibited, which is not preferable. Among the above ranges, it is particularly preferable that [A1 to [B] be in the range of 15:1 to 1:10.

A liquid dispersion medium may be further added to the above composition as required. Examples of liquid dispersion media include monohydric alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; polyhydric alcohols such as ethylene glycol, diethylene glycol, and glycerin; cyclic alcohols such as dibenzyl alcohol; and cellosolve acetates. ; Examples include ketones.

These liquid dispersion media may be used alone or in combination, but
It is preferable to decide by taking into consideration the dispersion stability of the coating composition, the wettability to the surface of the molded article when a coating method is used, the difficulty of removing the liquid dispersion medium, and economic efficiency.

``1. The coating composition further contains a small amount of an acid or alkali, an antifoaming agent, a surfactant, a lubricant, an antistatic agent,
Commonly used additives such as antioxidants, ultraviolet absorbers, light stabilizers, film-forming aids, thickeners, pigments, pigment dispersants, fungicides, algaecides, and Matsuki fillers can be mixed. can.

When applying the above-mentioned coating composition to the surface of the synthetic resin substrate, any method known per se may be used, such as roll coating, dip coating, brush coating, spray coating, Vertu method, knife coating, etc.

When the coating composition is formed as a single film without being in a solution state, a coextrusion method, an extrusion coating method, an extrusion lamination method, and a lamination method are used.

A film derived from the above coating composition is formed on the surface of a synthetic resin substrate under heat treatment. As a result, the silane compound and the acrylic resin are chemically bonded, and the coating becomes strong and has excellent barrier properties against contaminants, improving stain resistance. Heat treatment methods when using a coating method as a coating method include, for example, hot air heating, infrared heating, far infrared heating, etc. However, in consideration of heat treatment efficiency and safety, hot air heating is advantageous. In this case, the temperature conditions are in the range of 50 = 200°C,
It is best to choose a time between 10 seconds and 60 minutes.

The amount of solid matter deposited in the film formed on the surface of the synthetic resin substrate under heat treatment is in the range of 0.05"-20g/I02, preferably Q, i □'> Ji Og/ +n". is preferable.

If the adhesiveness between the base material surface and this film is not sufficient, the base material surface may be treated with plasma treatment or corona discharge treatment before applying the coating M acid. It is better to modify the

There are no particular limitations on the shape of the synthetic resin molded article of the present invention. However, from the viewpoint of ease of the process of forming a coating, a sheet, film, plate, or tubular form is suitable. These molding methods are appropriately selected from commonly used methods such as calendar molding, extrusion molding, inflation molding, injection molding, and casting.

"Effects of the Invention" and "Operations" The synthetic resin molded article according to the present invention has a specific coating formed on its surface, and this coating has an extremely excellent effect of preventing pollutants.

Therefore, the synthetic resin molded product of the present invention can maintain its beautiful appearance for a long time, and is especially suitable for use in desk mats, medical record holders, document holders for stationery, etc., where electrostatically copied paper or thermally copied paper is sandwiched or inserted. It is useful in a variety of fields, and its industrial value is great.

In addition, especially when the synthetic resin is a soft vinyl chloride resin containing a large amount of plasticizer, bleed-out of the plasticizer, etc. on the surface of the molded product is suppressed, resulting in a molded product with significantly improved stain resistance. This will greatly expand the field of use of such resins.

“Examples” The present invention will be explained in detail based on Examples below.
The present invention is not limited to the following examples unless it exceeds the gist thereof.

Example 1. -=, 6. Go to Comparative Example 1 5 (1) Preparation of Acrylic Resin Go to Production Example 1 74 100 parts by weight of isopropyl alcohol was added to a reactor equipped with a thermometer, a stirrer, a reflux condenser, and a nozzle for adding raw materials. , 1.0 parts by weight of benzoyl peroxide and! #1 100 parts by weight of the mixture of each monomer shown in Table 1 was charged, stirred in a nitrogen gas stream, and kept at 80°C for 3 hours. Further, 0.5 parts by weight of benzoyl peroxide was added to continue the reaction for about 3 hours. Acrylic resins A to D were obtained by continuing at the same temperature for the same time.

=19- (2) Preparation of coating composition The product obtained in the above production example (acrylic resin A
Various coating compositions were prepared by blending silane compound [AI] of the type and amount shown in Table 2 with -LiD). however,
Comparative Example 2 contained a silane compound [no AI was blended]. Further, in Comparative Example 3, acrylic resin [B] was not blended.

(3) Formation of coating After drying the resulting coating composition with isopropyl alcohol, the coating amount (as solid content) is 3. It was diluted to give Qg/1112 and applied to the surface of various types of Tree N films using the barcode method as shown in Table 2.

In addition, in Comparative Example 1, no coating was applied and no film was formed.

Then, the sample was allowed to remain in hot air at 00° C. for 3 minutes to scatter the solvent, and at the same time heat treatment was performed. However, in Comparative Example 5, after applying the coating composition, the solvent was naturally dried without being subjected to overheating treatment to scatter the solvent to obtain a dry film.

(4) Evaluation of coating = 20 - Various properties of the coating formed on the obtained film were evaluated using the methods described below.

■ Adhesion Cellophane tape was adhered to the surface of each film on which the coating was formed, and when the cellophane tape was peeled off, the peeling status of the coating was observed with the naked eye.

The results are shown in Table 2. The evaluation criteria are as follows.

○...The coating did not peel off at all and remained completely.

○X: 273 or more of the coating remained without being peeled off.

Δ: 273 or more of the coating has peeled off.

×...The film was completely peeled off.

■Stain resistance■ Apply each contaminant to the coating surface of the film, leave it at room temperature for 48 hours, then wipe off the contaminant with absorbent cotton.
I observed the traces. The results are shown in Table 2. The evaluation criteria are as follows.

◎...No traces observed at all.

○: Traces are observed on a part of the film.

Δ: Traces are observed in 273 or more areas of the coating.

×: Traces are observed on the entire surface of the coating.

■ Stain resistance ■ Each film was cut into 10 c + n x 10 can squares, and the printed side of electrostatic copying paper or thermal copying paper was brought into close contact with the surface on which the film was formed (the comparative example film was on one side). Ta. In this state, a load of 2 kg was applied and the product was left in an oven maintained at 50° C. for 48 hours.

The film was then removed from the oven, the load was removed, each copy paper was peeled off, and the degree of contamination on the film surface was observed. The results are shown in Table 2. The evaluation criteria are as follows.

◎...No traces observed at all.

○: Traces are observed on a part of the film.

Δ: Traces are observed in 273 or more areas of the coating.

×: Traces are observed on the entire surface of the coating.

Table 2 shows that the synthetic resin molded product according to the present invention has particularly excellent stain resistance, which prevents contamination, dust, dirt, etc. from adhering to the surface of the molded product, and maintains a beautiful appearance for a long period of time. It turns out that it can be maintained.

Examples 7...12, Comparative Example G/X-] (First, Examples and Comparative Examples in which the synthetic resin is a vinyl chloride resin are shown.

(1) Kyo-($7--Duichi--714-Mei>1♂g next to 4 flowers (-Polyvinyl chloride (P=1.400)
100 parts by weight Nooctyl 7 tallate 50/
/ Epoxidized large q oil 3〃Barium-zinc complex liquid stabilizer 1.5〃Barium stearate 0.2〃Zinc stearate
0.4 (after preparing a fat composition and mixing it with a super mixer for 10 minutes) 80℃
A soft vinyl chloride-based UF fat film having a thickness of 0.31 mark was prepared by kneading the mixture using a mill roll heated to .

(2) A coating composition was obtained by blending a silane compound and an acrylic resin in the types and amounts shown in Table 3 of MfAfl Nagoya, and adding isopropyl alcohol to the mixture so that the solid content was 20% by weight.

In addition, the acrylic resin was used in Examples 1-6 and Comparative Example 1-
...Similar to 5, those shown in Table 1 were used. Comparative example 2
No silane compound was added. Furthermore, in Comparative Example 3, no acrylic resin was blended.

Each of the above coating compositions was applied to one side of the base film prepared by the above method using a #5 bar coater.

The coated film was kept in an oven at 130'C for 3 minutes to evaporate the solvent and simultaneously perform heat treatment. However, in Comparative Example 5, after applying the coating composition,
The solvent was volatilized by natural drying without heat treatment to obtain a dry film. The amount of coating on each film obtained was approximately 2.0 g.
/ +n2. In addition, in Comparative Example 6, no film was formed.

(3) For adhesion, use the same method as in Example 1 and 6, and for stain resistance, use the stain resistance I in Example 1-=,, 6. It was evaluated using the same method. Furthermore, a plasticizer migration test was conducted using the following method.

11 types of films, each 10 c+nX 10 c
The film was cut into an an angle, and a polystyrene sheet having a thickness of 0.5, 5+n+n was closely attached to the surface on which the film was formed (the film of Comparative Example 6 was one surface). In this state, a load of 2 kg was applied and the product was left in an oven maintained at 50° C. for 48 hours.

Then, after taking it out of the oven, taking off the load, and peeling off the polystyrene sheet] 1! ! The weight loss of each If class film was measured.

The lower the number, the less the plasticizer migrates from the film surface.

The evaluation results are shown in Table 3.

From Table 3, the vinyl chloride resin molded product according to the present invention is as follows:
In particular, it has excellent plasticizer transfer resistance and stain resistance, so it is possible to prevent contamination, dust, dirt, etc. from adhering to the surface of the molded product, and it is found that a beautiful appearance can be maintained for a long period of time.

Patent applicant: Mitsubishi Kasei Vinyl Co., Ltd. Representative patent attorney for long diameter - (1 other person)

Claims (4)

[Claims] (1) A silane compound [A] having a hydrolyzable group directly connected to a silicon atom and an alkyl ester of acrylic acid or methacrylic acid (hereinafter referred to as (meth)) on the surface of a synthetic resin base material.
They are referred to as acrylic acid alkyl esters. ), or a mixture of this and an alkenylbenzene monomer, and an acrylic resin obtained by polymerizing a copolymerizable a,β-ethylenically unsaturated monomer [B] A synthetic resin molded product that is formed by heat treatment with a film containing as its main component. (2) The synthetic resin according to claim 1, wherein the synthetic resin base material is made of a vinyl chloride resin containing 20 parts by weight or more of a plasticizer per 100 parts by weight of the vinyl chloride resin. Molding. (3) The silane compound [A] has the general formula (R^1O)_3Si[OSi(OR^2)_2]_n
(OR^3) (wherein R^1 to R^3 each represent the same or different alkyl group, aryl group, alkylaryl group, aryloxyalkyl group, or alkyloxyalkyl group, and n is 0 or a positive integer), a tetraalkoxysilane monomer or polymer represented by
Furthermore, the synthetic resin molded article according to claim 1 or 2, which is a compound obtained by hydrolyzing a hydrolyzable group. (4) Claims in which the ratio of the silane compound [A] to the acrylic resin [B] is within the range of 20:1 to 1:15 by weight per solid component. The synthetic resin molded article according to any one of Items 1 to 3.