JPH02298521A - Coated synthetic resin molded body and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject molded body excellent in adhesion without causing peeling or pinholes by forming an organosilane compound thin film on the surface of a synthetic resin molded body, then irradiating the thin film with electron rays and subsequently forming a silicon oxide film on the resultant primer layer. CONSTITUTION:The objective molded body, obtained by forming a thin film composed of an organosilane compound (e.g. gamma-aminopropyltriethoxysilane) preferably expressed by the formula (X is 1-10C hydrocarbon having vinyl, methacryloxy, epoxy, amino, etc.; Y is 1-10C hydrocarbon having alkoxy, acetoxy, etc.; n is 1-3), etc., on the surface of a synthetic resin molded body, then irradiating the thin film with electron rays to form a primer layer and subsequently forming a silicon oxide film on the resultant primer layer, remarkably improved in surface hardness, weather and chemical resistance, moisture permeability and absorptivity, etc., and suitable as substrates for photomagnetic disks, magnetic disks, etc.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a coated synthetic resin molded article having a silicon oxide coating formed thereon, and more specifically, the silicon oxide coating has excellent adhesion, wear resistance, and weather resistance. , relates to a coated synthetic resin molded article with improved surface conditions such as chemical resistance, and a method for producing the same.

[Prior Art 1] In order to modify the surface of a synthetic resin molded body, a technique of coating it with an oxide such as silicon dioxide, a metal nitride, or the like is known.

Conventionally, methods for coating oxide films, etc., include vacuum evaporation,
Various methods are known, such as sputtering, ion blasting, and plasma CVD, but these film forming methods require special equipment or are difficult to form on the surface of large molded bodies or molded bodies with complex shapes. It has some disadvantages, such as the fact that it is difficult to do so. Another problem is that the adhesion between the synthetic resin molded body and the coating is insufficient.

Recently, instead of directly coating the surface of a synthetic resin molded body with a silicon dioxide film, a silicon-containing film with good adhesion is coated on the surface of the synthetic resin molded body in advance as a primary film (brimer), and then a silicon-containing film with good adhesion is coated on the surface of the synthetic resin molded body. A method of creating a silicon dioxide film that has good adhesion to the primary film has been proposed (Japanese Patent Laid-Open No. 1988-1.2734). That is, in this method, a synthetic resin molded article is coated and cured with at least one silicon compound selected from the group consisting of silicon compounds represented by the following general formula, their hydrolysates, and colloidal silica. After forming the primary coating, the synthetic resin molded article with the primary coating is brought into contact with a supersaturated hydrofluorosilicic acid solution of silicon dioxide to form a silicon dioxide coating on the primary coating. This is a method for producing a coated synthetic resin molded article.

R1n S], (R2) a-n (wherein R is a hydrocarbon group having 1 to 6 carbon atoms, a vinyl group, a methacryloxy group, an epoxy group, an amino group, a mercapto group, an organic group having fluorine or chlorine, , R2 is one or more bonding groups selected from an alkoxy group, an alkoxyalkoxy group, an acetoxy group, and a chlorine element, and n is 0 to 4.) According to this method, compared to the conventional method, Since it is possible to obtain a highly durable coating using a coating method and a dipping method can be used, it is also applicable to large-sized or complex-shaped synthetic resin molded bodies. However, in this method, although the adhesion between the silicon dioxide coating and the brimer is good, the adhesion between the synthetic resin molded article and the brimer is still insufficient. The reason for this is presumed to be that almost no strong chemical bond is formed between the silicon compound used as the brimer and the synthetic resin molded article. Therefore, in the method described above, the adhesion of the silicon dioxide coating to the synthetic resin molded article is still not sufficient.

By the way, among synthetic resin moldings, polycarbonate resin moldings are transparent, have excellent impact resistance, and have good heat resistance, but they have the drawbacks of being easily scratched and worn on the surface, and easily attacked by alkali. There is. Conventionally, various surface hardening coating methods have been proposed, but because the surface does not have functional groups with strong polar groups, adhesion is insufficient, and coating polycarbonate resin, which has strong adhesion to silicon oxide films, has been proposed. No molded body was obtained.

Furthermore, many polymers such as polyethylene terephthalate, polyamide, polyether ether ketone, and polyimide have been developed and put into practical use as engineering plastics, and synthetic resin molded bodies made of these polymers are coated with a silicon oxide film. However, no improved method for surface modification has been proposed.

[Problem to be solved by the invention]

An object of the present invention is to provide a coated synthetic resin molded article having a silicon oxide coating with excellent adhesion.

Another object of the present invention is to provide a silicon oxide-coated synthetic resin molded article with improved surface conditions such as abrasion resistance, weather resistance, and chemical resistance.

The present inventors have solved the problem 1 of the above-mentioned prior art.
As a result of intensive research to overcome this problem, we found that in normal brimer treatment using an organosilane compound (silane coupling agent), at best, electrostatic attraction between polar groups acts between the synthetic resin molding and the organosilane compound. It was found that the adhesion between the two was poor because no strong bond was formed. Therefore, after forming a single layer of primer with an organic silane compound, we performed heat treatment, but a chemical bond was formed between it and the synthetic resin molded article (only a portion of the primer layer was formed, and the adhesion was insufficient). Moreover, the heat treatment method has problems in that the heat conduction efficiency is poor and stress is generated in the synthetic resin molded body due to heat.

Therefore, as a result of further research, we found that after forming a coating layer (thin film) with a specific organic silane compound on the surface of a synthetic resin molded object and irradiating it with an electron beam, chemical bonds between it and the synthetic resin molded object were effectively formed. The formed primer can be made into a single layer, and the organic silane compound is 13i-0-5i-
Forms bonds and does not require special treatment such as hydrolysis.
It has been found that a single primer layer can be formed that has sufficient adhesion to the silicon oxide film.

The present invention has been completed based on these findings.

[Means to solve the problem]

That is, the gist of the present invention is as follows.

(1) (A) A single layer of primer consisting of a thin film of an organic silane compound irradiated with an electron beam, and (C) a silicon oxide film are formed in this order on the surface of (A) a synthetic resin molded body. Coated synthetic resin molded body.

(2) A thin film made of an organic silane compound is formed on the surface of a synthetic resin molded body, and then a single layer of primer is formed by irradiation with an electron beam, and then a silicon oxide film is formed on the primer layer. A method for producing a coated synthetic resin molded article.

Each component of the present invention will be explained below.

(Synthetic resin molded article) The synthetic resin molded article used in the present invention is not particularly limited, and molded articles made of various polymers can be used.

Examples of synthetic resins include polyvinyl chloride, polystyrene, polycarbonate, polymethyl methacrylate,
Thermoplastic resins, epoxy resins such as polyamide, polyacetal, polyether ketone, polyimide, polyethylene terephthalate, polybutylene terephthalate, fully aromatic polyester, polyether ketone, polyether ether ketone, polyphenylene sulfide ketone,
Examples include polydielene glycol bisallyl carbonate, phenolic resin, and polyurethane.

Among these, molded articles mainly composed of polymers having carbonyl bonds in repeating units can be particularly preferably used. A polymer having a carbonyl bond means a polymer having not only a ketone group but also a (>C=O) bond in its molecular structure, such as an acid amide bond or an ester bond.

These polymers are used alone or in combination of two or more.

Further, the shape of the synthetic resin molded product is not particularly limited, and molded products of any shape can be used, from large products to those with complicated shapes.

(Organosilane compound) As the organic silane compound, there are general-purpose silane coupling agents containing a vinyl group, a methacryloxy group, an epoxy group, an amino group, or an isocyanate group.

Among them, organic silane compounds represented by the following general formulas [I] and [11] can be preferably used.

xns1y4-n [I] [However, X is a vinyl group, methacryloxy group, epoxy group, amino group, or a hydrocarbon group having 1 to 10 carbon atoms having an isocyanate group, Y is an alkoxy group, an alkoxyalkoxy group, an acetoxy group, or a hydroxyl group 1 to 10 carbon atoms with
is a hydrocarbon group, n is an integer of 1 to 3. ] Specifically, γ-aminopropyltriethoxysilane,
γ-Aminopropyltrimethoxysilane, γ-Isocyanatepropyltrimethoxysilane, γ-Isocyanatepropyltriethoxysilane, γ-Incyanatopropylmedyldimethoxysilane, Glycidoxypropyltrimethoxysilane, Glycidoxypropyltriethoxy silane, glycidoxypropyl) ~ liproxysilane, glycidoxybrobyl methyldime I xysilane,
Glycidoxypropylethyldimethoxysilane, glycidoxypropylethyldimethoxysilane, glycidoxypropylethyljethoxysilane, glycidoxypropylbutyldimethoxysilane, glycidoxypropylbutyljethoxysilane, 2-(2,3 -Epoxycyclohexyl)ethyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane,
-aminoethyl)aminopropylmethyldimethoxysilane, γ-anilipropyltrimethoxysilane, N-
Phenylaminomethyltrimethoxysilane, N-<I-
ethoxysilylprobyl) urea, aminomethyltriethoxysilane, 1l-(β-aminoedyl)aminomethyltrimethoxysilane, aminomethyljethoxysilane, vinyl 1-ethoxysilane, vinyl tris(β-methoxyethoxy)silane, vinyl Acetoxysilane, γ
-methacryloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and the like.

R4-□S i (OOR') ll [H
]c In the formula, R is a hydrocarbon group having 1 to 6 carbon atoms, a vinyl group,
A methacryloxy group, an epoxy group, an amino group, a mercapto group, an organic group having fluorine or chlorine, R' is one or more bonding groups selected from an alkyl group, an acyl group, and an arylalkyl group, and n is 1 It is an integer of ~4. ] Specifically, for example, vinyltris(t-butylperoxy)silane, vinyltris(cumemberoxy)silane, vinyltris(acetylperoxy)silane, vinyltris(benzoylperoxy)silane,
Vinyltris(lauroylperoxy)silane, γ-glycidoxypropyltris(t-butylperoxy)silane, γ-glycidoxypropyltris(cumemberoxy)silane, γ-glycidoxypropyltris(acetylperoxy) Silane, γ-glycidoxypropyltris(benzoylperoxy)silane, γ-glycidoxypropyltris(lauroylperoxy)silane,
γ-methacryloxypropyltris(t-butylperoxy)silane, γ-methacryloxypropyltris(cumemberoxy)silane, γ-methacryloxypropyltris(acetylperoxy)silane, γ-methacryloxypropyltris(benzoylperoxy)silane oxy)silane, γ-methacryloxypropyltris(lauroylperoxy)silane, etc. These organosilicon compounds can be used alone or in combination.

(Method for forming a primer layer) To form a thin film made of an organic silane compound on the surface of a synthetic resin molded product, the organic silane compound can be mixed with an alcohol such as methanol, ethanol, isopropanol, or isobutanol. The solution may be applied to a synthetic resin molded article by a spin cord method, dipping method, spraying method, etc., and then dried to remove the solvent. In the case of large-sized or complex-shaped synthetic resin molded articles, the dipping method is preferred.

The concentration of the organic silane compound in the solution can be determined as appropriate, but from the viewpoint of coating efficiency, it is usually preferable to set the concentration of the organic silane compound in the solution to 0.1 to 5% by weight. Further, drying after application is performed at room temperature or in a dryer. If it is at room temperature, it is air-dried for about 1 to 2 hours, and if it is heated, it is dried in a hot air dryer or the like under elevated temperature conditions, for example, at about 90° C., for about 1 to 2 hours. These drying conditions can be appropriately selected by those skilled in the art.

! In the present invention, a thin film made of an organic silane compound is formed on the surface of a synthetic resin molded article, and then an electron beam is irradiated to form a primer layer. It is presumed that a chemical bond is formed in the electron beam irradiation) '9'89 resin type 9' II chemical bond 011.

The electron beam irradiation is usually performed at a dose rate of about 0.05 to 10 Mrad/S, preferably about 0.16 Mrad/S, in an atmosphere of an inert gas such as argon gas. The dose varies depending on the type of synthetic resin, but it ranges from 0.5 to several meters.
In the range of r a d, the synthetic resin surface layer should not be decomposed or deteriorated, and for polycarbonate, usually
It is preferably 5 Mrad or less. In addition, by performing electron beam irradiation and a coating test in advance, those skilled in the art can appropriately select a preferable range of the dose depending on the type of resin.

By irradiating the electron beam, a chemical bond is generated between the organosilicon compound and the synthetic resin molded body, and a strong bond is generated between the thin film of the organosilicon compound and the surface of the synthetic resin molded body. At the same time, a -8i-0-8i-bond is formed between the Y moieties of the general formula [I] in the molecules of the organosilicon compound, and an X-ray photoelectron spectrometer (Xray Photo
o Electron Spectro 5copy
), about 70-80% of the total is SiO.
It is observed as 2.

In addition, since the silyl peroxide compound represented by formula [11] has strong activity, it has a strong bonding force with the synthetic resin molded body of the base material, and since it has an excess of oxygen atoms, especially on the surface, It has a 5in2 shape.

After the electron beam irradiation treatment, a silicon oxide film is formed on the thin film of the organosilane compound.

Examples of silicon oxide compounds include S such as 5in2 and SiO.
Conventionally known Si-based oxides such as in, (2≧X≧1), and 5iAnON can be used. Methods for forming the film include vapor deposition, sputtering, plasma CVD,
Conventional means such as liquid phase growth can be used.

Among silicon oxide coatings, silicon dioxide coatings are preferred. Methods for forming a silicon dioxide film on the primer layer (thin film of an organic silane compound irradiated with an electron beam) that has been subjected to the primer treatment include a CVD method using silane gas, a sputtering method using a quartz plate as a target, and an organic silane film. Examples include a dipping method using an organic solvent containing a silicon compound, and a precipitation method in which silicon dioxide is immersed in a supersaturated hydrofluorosilicic acid solution to deposit a silicon dioxide film. Among these, the precipitation method is preferred because it is easy to work with and can form a uniform film.

As for this precipitation method, a known method disclosed in detail in JP-A-61-12734 can be applied. A supersaturated hydrofluorosilicic acid solution of silicon dioxide is made by dissolving silicon dioxide (silica gel, aerosil, silica glass, other silicon dioxide-containing materials, etc.) in a hydrosilicic acid solution, and then using water or a reagent (boric acid, Aluminum chloride, etc.) is added to create a supersaturated state of silicon dioxide. The synthetic resin molded body subjected to the brimer treatment may be brought into contact with this treatment liquid. The contact may be carried out by immersing the synthetic resin molded body in the treatment liquid or by allowing the treatment liquid to flow down onto the surface of the molded body, but the immersion method is preferable in order to form a uniform film.

The concentration of hydrofluorosilicic acid in the treatment solution is 1 to 2 mol/℃
is preferable, and in particular, after saturating silicon dioxide in an aqueous solution of hydrofluorosilicic acid with a concentration of more than 2 mol/4, diluted with water to 1
A concentration of ~2 mol/f2 is desirable because the film formation rate is fast and coating can be carried out efficiently. When boric acid is added to achieve a supersaturated state, the amount added is based on 1 mole of hydrofluorosilicic acid in the treatment liquid], X10-2 ~
40 x 10-2 mol, preferably 1.2 x 10-2 to 1
A range of O x 10-2 mol is desirable in order to quickly form a homogeneous film.

In order to efficiently obtain a homogeneous film, it is preferable to continuously add and mix the boric acid aqueous solution while the synthetic resin molded body is immersed in the treatment liquid, and to circulate the treatment liquid and filter it with a filter. When using silica gel as a source of silicon dioxide, a filter with a pore size of 1.5 μm or less is used, and when using other materials such as silica glass, a filter with a pore size of 10 μm is used.
The following filters are preferred.

In addition, when placing the treatment liquid in an immersion tank and bringing it into contact with a synthetic resin molded article, it is important to allow the treatment liquid to flow in a laminar flow on the surface of the molded article during immersion to ensure an even and homogeneous flow. Preferred for forming a film.

The thickness of the silicon oxide film such as silicon dioxide can be determined as appropriate depending on the purpose of use, but usually, the purpose of surface modification can be achieved with about several hundred to several thousand people.

However, in the conventional brimer treatment using a silicon compound such as a silane coupling agent, no strong chemical bond is formed between the brimer (first coating layer) and the surface of the synthetic resin molded article.

On the other hand, when a thin film of an organosilicon compound is formed on the surface of a synthetic resin molded body and then irradiated with an electron beam, a chemical bond is formed between the synthetic resin molded body and the organosilicon compound of the brimer, and both become strong. join to. As the synthetic resin molded article, a molded article mainly composed of a polymer having a carbonyl bond (>C=O) is particularly effective.

According to the electron beam irradiation method, ■Energy is contained in each individual electron, so the amount of energy can be easily controlled by manipulating the accelerating voltage, and ■Since high energy is integrated, synthetic resin Since it is easy to reach the reaction site between the molded body and the primer, a chemical bond is reliably formed between the two in a short time.

In addition, in the conventional brimer treatment using a silane coupling agent, in order to improve adhesion to the silicon oxide film, it was necessary to hydrolyze alkoxy groups and convert them into hydroxyl groups before applying it to the base material. . Furthermore, the bonding properties between the brimer molecules were also weak. However, according to the electron beam irradiation method, the alkoxy groups of the organosilicon compound applied to the surface of the synthetic resin molded body are
By forming bonds, the brimer molecules firmly bind to each other,
Moreover, since most of the surface of the primer layer has a 5 in 2 shape, the silicon oxide film can be formed in the same way as on a glass surface, resulting in a coating layer with extremely excellent adhesion.

(Margin below) [Example] The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited only to these Examples. The methods for measuring physical properties such as adhesion tests in Examples and Comparative Examples are as follows.

<Method for Measuring Physical Properties> 41 Kasamenu ±: Adhesive tape is attached to the surface of the silicon oxide-coated synthetic resin molded product and abruptly peeled off in a 90 degree direction.

When the silicon oxide film peeled off, it was rated as ×, and when it did not peel off, it was rated as ○. In addition, when a part of the film peeled off, it was marked as △.

After exposing the silicon oxide-coated synthetic resin molded article for 200 hours in a carbon arc type weatherometer (WE-3un-DC; manufactured by Toyo Rika Co., Ltd.), an adhesion test was conducted. The evaluation method is the same as the adhesion test.

Uwayarizu 1 After boiling the silicon oxide-coated synthetic resin molded body in hot water for 1 hour, an adhesion test was conducted. The evaluation method is the same as the adhesion test.

Kanen-no: Silicon oxide coated synthetic resin molded body heated in oven at 80℃ for 5 minutes.
After leaving it for 0 hours, an adhesion test was conducted. The evaluation method is the same as the adhesion test.

Gangdong store: Silicon oxide coated synthetic resin molded products are heated to 65℃ in a constant temperature machine.
After being left at 95% RH for 3 weeks, an adhesion test was conducted. The evaluation method is the same as the adhesion test.

[Example 1] Optical disk substrate (130
φ, thickness 1.2 mm), isopropanol solutions (concentration 1% by weight) of various organic silane compounds shown in Table 1 were applied by dipping method, and dried by heating at 80''C for 3 minutes.

The film thickness was 100 people.

1 Next, the surface coated with the organic silane compound was irradiated with an electron beam under the conditions shown in Table 1. The electron beam was irradiated in an argon gas atmosphere at a dose rate of 1.6 Mrad/S.

A silicon dioxide film was deposited on the polycarbonate optical disk substrate subjected to the above treatment using a silicon dioxide film manufacturing apparatus similar to that shown in JP-A-61-12734.

That is, the silicon dioxide coating manufacturing apparatus has a dipping tank consisting of an outer tank and an inner tank, and the space between the inner tank and the outer tank is filled with water. This water is heated with a heater to a temperature of 35° C., and is stirred with a stirrer to make the temperature distribution uniform. The inner tank consists of a front part, a middle part, and a rear part, and each part contains 2.0 mol/I2. An aqueous solution of hydrofluorosilicic acid with a concentration of is diluted with water at 3℃.
The reaction solution is full. At this point, the circulation pump was activated to discharge a certain amount of the reaction liquid from the rear of the inner tank, filter it with a filter, and start circulating the treated liquid back to the front of the inner tank.

Thereafter, a 0.5 mol/flood boric acid aqueous solution was continuously poured into the rear part of the inner tank and maintained for 10 hours. In this state, the reaction solution became a treatment solution having an appropriate degree of silicon dioxide supersaturation.

Here, the absolute removal rate of the filter is 1.5 μm, and the processing liquid circulation amount is 240 m for 127 minutes (the total amount of processing liquid is approximately 3β
Therefore, the circulation rate was adjusted to 8%/min).

Then, the polycarbonate optical disk substrate subjected to the above treatment was immersed vertically into the middle of the inner tank, and
A boric acid aqueous solution of mol/°C was added at a rate of 0.2 mρ/min, and 8
%/min and filtered through a 1.5 μm filter) for 3 hours.

The thickness of the silicon dioxide coating layer on the obtained coated polycarbonate optical disk substrate was approximately 900 mm.

Table 1 shows the results of measuring the properties of the silicon dioxide-coated synthetic resin molded article.

(Left below) [Example 2] A flat plate made of polyethylene terephthalate resin (length 100 mm, width 100 mm, thickness 2
m m ), thin films of various organic silane compounds shown in Table 2 were formed in the same manner as in Example 1, and electron beam irradiation was performed in the same manner. Then, a silicon dioxide-coated polyethylene terephthalate resin flat plate was obtained by processing in the same manner as in Example 1.

Regarding the characteristics, the measurement results are shown in Table 2.

(Left below) [Example 3] A flat plate made of polycarbonate resin (100 mm long, 100 mm wide, 2 mm thick) was soaked with an isobutanol solution (concentration 1% by weight) of vinyltris(t-butylperoxy)silane by dipping. It was coated and dried by heating in a hot air dryer at 80°C for 3 minutes. The film thickness was approximately 100 people. Then, an electron beam was applied to the entire coated surface at 5 Mr.
Irradiation was performed in an argon gas atmosphere at a dose rate of ad/S.

A polycarbonate resin flat plate treated with a primer was treated in the same manner as in Example 1 to deposit a silicon dioxide film.

As a result of immersion and holding for 16 hours, a silicon dioxide film with a thickness of 5,000 yen was obtained.

[Example 4] A polycarbonate resin plate coated with silicon dioxide was obtained in the same manner as in Example 3 except that vinyltris(acetylperoxy)silane was used as the organic silane compound.

[Example 5] A polyetherimide flat plate (vertical 10
A silicon dioxide-coated polyetherimide flat plate was obtained in the same manner as in Example 3, except that a polyetherimide plate having a width of 0 mm, a width of 100 mm, and a thickness of 2 mm was used.

[Example 6] A polydiethylene glycol bisallyl carbonate resin flat plate (100 mm long, 100 m wide) was used as a synthetic resin molded body.
A silicon dioxide-coated polydiethylene glycol bisallyl carbonate resin flat plate was obtained by processing in the same manner as in Example 3, except that a silicon dioxide-coated polydiethylene glycol bisallyl carbonate resin plate was used.

[Example 7] The conditions for electron beam irradiation were 105 M rad / S.
A polycarbonate resin plate coated with silicon dioxide was obtained by processing in the same manner as in Example 3 except that the dose rate was set to .

[Comparative Example 1] Example 3 except that the brimer treatment was not performed.
A polycarbonate resin plate coated with silicon dioxide was obtained by processing in the same manner as above.

The results are summarized in Table 3.

〔Effect of the invention〕

According to the present invention, a single layer of primer that is firmly bonded to the synthetic resin of the base material can be formed by simply irradiating the primer with an electron beam after performing primer treatment with an ordinary organic silane compound. In addition, the surface area of the primer layer is generally 5in2.
Therefore, it has good adhesion with the silicon oxide film formed thereon, and the occurrence of peeling and pinholes can be significantly reduced. Furthermore, long-term storage between the brimer treatment and the formation of the silicon oxide film, which is difficult with ordinary brimer treatment using organic silane compounds, is now possible.

By the manufacturing method of the present invention, it is possible to obtain a molded article with significantly improved adhesion to the silicon oxide film, surface hardness, weather resistance, chemical resistance, moisture permeability, moisture absorption, etc. It can be used in a wide range of fields, including magnetic disk substrates, magnetic disk substrates, and synthetic resin substrates as substitutes for car and train window glass.

Claims (5)

[Claims] (1) (A) A primer layer consisting of a thin film of an organic silane compound irradiated with an electron beam on the surface of (B) an electron beam irradiation,
and (C) a coated synthetic resin molded article, characterized in that a silicon oxide coating is formed in this order. (2) The organic silane compound has the following general formulas [I] and [I
The coated synthetic resin molded article according to claim 1, which is at least one compound selected from the compounds represented by [I]. X_nSiY_4_-_n[I] [wherein,
10 hydrocarbon groups, Y is an alkoxy group, an alkoxyalkoxy group, an acetoxy group, or a carbon number 1 having a hydroxyl group
~10 hydrocarbon groups, n is an integer from 1 to 3. ] R_4_−_nSi(OOR')_n[II] [wherein,
R is a hydrocarbon group having 1 to 6 carbon atoms, a vinyl group, a methacryloxy group, an epoxy group, an amino group, a mercapto group, an organic group having fluorine or chlorine, and R' is an alkyl group,
It is one or more bonding groups selected from an acyl group and an arylalkyl group, and n is an integer of 1 to 4. ] (3) A thin film made of an organic silane compound is formed on the surface of the synthetic resin molded body, and then a primer layer is formed by irradiation with an electron beam, and then a silicon oxide film is formed on the primer layer. A method for producing a coated synthetic resin molded article. (4) The organic silane compound has the following general formula [I] and [I
4. The method for producing a coated synthetic resin molded article according to claim 3, wherein the compound is at least one compound selected from compounds represented by [I]. X_nSiY_4_-_n[I] [wherein,
10 hydrocarbon groups, Y is an alkoxy group, an alkoxyalkoxy group, an acetoxy group, or a carbon number 1 having a hydroxyl group
~10 hydrocarbon groups, n is an integer from 1 to 3. ] R_4_−_nSi(OOR')_n[II] [wherein,
R is a hydrocarbon group having 1 to 6 carbon atoms, a vinyl group, a methacryloxy group, an epoxy group, an amino group, a mercapto group, an organic group having fluorine or chlorine, and R' is an alkyl group,
It is one or more bonding groups selected from an acyl group and an arylalkyl group, and n is an integer of 1 to 4. ] (5) The silicon oxide coating is a silicon dioxide coating, and the synthetic resin molded article on which the primer layer is formed is brought into contact with a supersaturated hydrofluorosilicic acid solution of silicon dioxide, so that the silicon oxide coating is coated on the primer layer. The method for producing a coated synthetic resin molded article according to claim 3 or 4, wherein a silicon dioxide film is deposited.