JPS63314282A - Antistatic coating composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. which forms a coating film excellent in adhesion to a substrate and antistatic property, and which comprises a co- hydrolyzate of an alcoholic silica sol-metal compd. and a polymer having a particular functional group optionally along with an acid catalyst. CONSTITUTION:100pts.wt., in terms of silica, hydrolyzable silicon compd. (a) such as an organosilicate compd. of the formula (wherein X is a halogen, a 1-8C alkoxy, alkoxyalkyl, aralkyl, aryl; and n is 0 or a positive integer) and 10-100pts.wt., in terms of oxide, co-hydrolyzable metal compd. (b) such as tin chloride are co-hydrolyzed in an alcohol solvent (c) such as isopropyl alcohol, thereby obtaining a colorless, transparent, low-viscosity colloidal soln. (A) of a co-hydrolyzate of an alcoholic silica sol-metal compd. contg. particles of 50-80Angstrom in diameter. Then, the component (A) and a polymer having a functional group, such as a silyl group, a COOH group and an OH group, capable of forming a chemical complex with the co-hydrolyzate of the component (A), optionally together with an acid catalyst (c), are mixed together.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention provides an alcoholic silica sol-metal product obtained by co-hydrolyzing a hydrolyzed silicon compound and a conductive metal compound in an alcohol solvent. A novel antistatic coating composition comprising a cohydrolyzate of a compound and a polymer containing a functional group such as a silyl group, a carboxyl group, or a hydroxyl group that can form a chemical complex with the cohydrolyzate. .

(Prior Art) Methods for preventing static electricity on synthetic resins are broadly classified into kneading type and coating type. The coating type has the advantage of being easy to apply and can prevent static electricity even on transparent objects without compromising its appearance.In terms of chemical substances, it can be roughly divided into surfactant type and siloxane type. . Surfactant type is a method in which a surfactant is applied to the plastic surface and is easy to apply, but on the other hand, it easily comes off due to abrasion, etc., which impairs the durability of the antistatic ability, causes stickiness, and causes damage to the surface to be tested. It has the disadvantage that it migrates to the materials it comes in contact with, contaminating (damaging) them. As disclosed in Japanese Patent No. 231959, the siloxane type provides an antistatic coating that has much better water resistance, abrasion resistance, solvent resistance, and weather resistance than the surfactant type. . However, unlike the previously known siloxane-type antistatic coating agents, the silica film is completely inorganic and is brittle and has poor flexibility. There is a problem with adhesion. In addition, if the film is not as thin as o,i"0.54, it will peel off, resulting in rainbow coloration due to interference on the film surface, which may be a problem when applied to transparent objects. .

In order to solve such problems, the present inventors
No. 0-84366 proposed an antistatic coating agent formed by condensation of a silyl group-containing polymer and polysiloxane (alcoholic silica sol obtained by hydrolyzing a hydrolyzable silicon compound in an alcohol solvent).

This improved the adhesion to the applied resin, but
Furthermore, the requirement for high antistatic performance is not fully satisfied.

On the other hand, the surface of materials such as plastic and glass can be made conductive.
That is, in order to have antistatic properties, it is sufficient to form an electronically conductive coating such as 5n021 In, ol, etc. on the surface of the material, but when forming these coatings, adhesion is poor unless vapor deposition or sputtering methods are used. Not only is the cost high, but
It is impossible to apply this method to large objects.

As an improved technique of this kind, JP-A No. 61-26679 discloses a method of forming a conductive film of SnO, In2O3 by a coating method, but in order to form an inorganic conductive film, a temperature of 500°C is required. Firing is required.

Therefore, the base material is limited to heat-resistant inorganic materials, which has the disadvantage that it cannot be applied to plastics or the like.

In response to this, the present inventors and others
No. (JP-A-Sho), a metal compound was added to an alcoholic silica sol obtained by hydrolyzing a hydrolyzable silicon compound in an alcohol solvent, and Si-0-M (M proposed a coating composition in which both metal atoms can be bonded together to form a conductive coating.

As a result, a high degree of antistatic ability was achieved, but the adhesion to substrates, especially synthetic resin substrates, was not fully satisfactory and there is still room for improvement.

(Problems to be Solved by the Invention) As a result of extensive studies in order to solve the problems seen in the conventional antistatic agents described above, the present inventors discovered that a hydrolyzable silicon compound and a co-hydrolyzable An alcoholic silica sol-metal compound cohydrolyzate obtained by cohydrolyzing an electronically conductive metal compound of
carboxyl group.

When chemically composited with a polymer containing a functional group such as a hydroxyl group, it is a coating that has excellent adhesion to the surface of a substrate, especially a plastic substrate, and can form a film with excellent electronic conductivity. The present inventors have discovered that an agent can be obtained, and have completed the present invention.

[Structure of the invention]

(Means for Solving the Problems) To summarize the present invention, the present invention provides (i) an alcohol obtained by co-hydrolyzing a hydrolyzable silicon compound and a co-hydrolyzable metal compound in an alcohol solvent; Co-hydrolyzate of silica sol and metal compound.

and (n) a polymer containing a functional group such as a silyl group, a carboxyl group, or a hydroxyl group that can form a chemical complex with the cohydrolyzate.

(iii) The present invention relates to an antistatic coating agent, which contains an acid catalyst if necessary.

Hereinafter, the configuration of the present invention will be explained in detail.

The co-hydrolyzate of the alcoholic silica sol and the conductive metal compound of the present invention is produced by combining a hydrolyzable silicon compound and a co-hydrolyzable metal compound in a predetermined amount in an alcoholic solvent in the presence or absence of a catalyst. It can be prepared by partial hydrolysis using water.

The alcoholic silica sol-metal compound cohydrolyzate thus prepared is a siloxane, i.e. 5i-
The metal (M) compound in the 0-3i chain (or network) is Si-0
It is a colloidal dispersion consisting of particles bound by -M bonds, and the particle size of the colloid particles produced is about 50 to 80 particles, and it is a colorless, transparent, and low-viscosity liquid.

As the hydrolyzable silicon compound used to prepare the alcoholic silica sol-metal compound co-hydrolyzate, an organic silicate compound represented by the general formula % (1) is used.

Specifically, for example, SiCQ, Si(OMe
)4゜5L(QC,)1. ),, 5i(OC,H,)
, 5i(OC4H9)41(ACO)45it and their condensates, such as CQ, 5iO3iCQ,
.

(CH30), 5iO5i(OCH3), (C,H
,O),5iO3i(OC,1Is)31(AcO)3
These include SiO3i (OAc), , and commercially available ethyl silicate 40 (manufactured by Colcote ■). Hydrolysates of these silicon compounds can be easily obtained by a conventionally known method, for example, by adding a predetermined amount of water to an alcohol solvent and reacting in the presence or absence of an acid catalyst. As such acid catalysts, both inorganic and organic acids can be conveniently used; the inorganic acids are preferably, for example, hydrochloric acid, sulfuric acid, phosphoric acid, phosphoric acid, etc., and the organic acids are formic acid.

Acetic acid, oxalic acid, p-)-luenesulfonic acid, and the like are preferably used. The amount of the catalyst is preferably about 1.0 ppm to 5% based on the silicon compound. Even if it is used in an amount exceeding 5%, the desired product can be obtained, but particularly good results cannot be expected.

The amount of silicon compound added is the solid content (silica content) of the solution 2
It is preferable to add it in an amount of ~10% by weight. The amount of water to be blended is such that the hydrolysis rate of the silicon compound is 70 to 500.
%, preferably from 100 to 300%. Solvents used include methanol, ethanol,
Alcohols such as propatool and butanol are preferred.

The reaction temperature is preferably room temperature, but a higher temperature may be used, and the reaction time varies depending on the temperature and amount of catalyst, but is generally 1 to 48 hours.

The present invention is characterized in that a co-hydrolyzable metal compound is used in combination when the hydrolyzable silicon compound is hydrolyzed with a predetermined amount of water in an alcoholic medium.

The metal compounds used in the preparation of the alcoholic silica sol-metal compound co-hydrolyzate of the present invention include AQ,
Ti, Fe, Ni, Sn, Cu, Mg,
Metal chlorides, nitrates, sulfates, carboxylates such as In and Sb.

Alkoxides, acetylacetonate complexes, and mixtures thereof are typical and reactive.

Tin compounds, especially their chlorides, are preferred from the viewpoint of performance such as economy, film transparency, strength, adhesion, and antistatic properties.

Regarding the blending ratio of the hydrolyzable silicon compound and the metal compound, increasing the proportion of the metal compound added increases the antistatic effect, but on the other hand, the adhesion to the base material decreases, and the ability to form particles also decreases. However, bleaching, etc. may occur, making it impossible to form an even northern circle, so these factors should be taken into consideration when deciding. Generally, the metal oxide obtained from the metal compound is blended in an amount of about 10 to 100 parts by weight, preferably 15 to 50 parts by weight, to 100 parts by weight of silica obtained from the hydrolyzable silicon compound.

In addition, when the co-hydrolysis reaction between the hydrolyzable silicon compound and the metal compound is carried out in the presence of an acidic catalyst, an acid such as hydrochloric acid remaining in a catalytic amount in the alcoholic silica sol-metal compound co-hydrolyzate that is produced. The surface of the base material is activated by activating a reaction (chemical compositing) with a functional group-containing polymer, which will be described later, or by causing a chemical reaction with the surface of the base material. This allows the coating composition of the present invention to firmly bond to the surface of the substrate. Therefore, carrying out cohydrolysis in the presence of an acidic catalyst is an effective method.

The functional group-containing polymer capable of forming a chemical complex with the alcoholic silica sol-metal compound co-hydrolyzate of the present invention is a polymer having a functional group such as a silyl group, a carboxyl group, or a hydroxyl group. be. These polymers are the unreacted hydrolyzable groups (
X in the above general formula, silanol group (Si-OH)
It has functional groups such as silyl groups, carboxyl groups, and hydroxyl groups that chemically react or hydrogen bond with other substances.
These polymers and the alcoholic silica sol-metal compound cohydrolyzate form a chemical complex due to reactions between these functional groups or hydrogen bonds.

The following functional group-containing polymers are used in preparing the chemical complex of the present invention.

(a) Silyl group-containing polymer (a-1) Silyl group-containing vinyl polymer Examples of the base polymer of the silyl group-containing polymer used in the present invention include vinyl polymers.

Examples of vinyl monomers constituting this type of vinyl polymer include acrylic acid, acrylic acid derivatives such as methyl acrylate, ethyl acrylate, butyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, Methacrylic acid derivatives such as butyl methacrylate, and mixtures of one or more of these, or other vinyl-based monomers such as styrene, vinyl acetate, acrylonitrile, and acrylamide that can be copolymerized with these acrylic monomers. A mixture of monomers may also be used, and the polymer of these monomers usually has a molecular weight of t, ooo to 10,00.
It is preferable to have a molecular weight of around 0.
Chain transfer agents such as dodecyl mercaptan and t-dodecyl mercaptan are used. When preparing these polymers, a solvent may or may not be used, but when used, hydrocarbons and acetate esters are used.

Inert solvents that are non-reactive with monomers such as ethers are preferred.

Two methods can be applied to introduce the silyl group: A) hydrosilylation method and B) copolymerization method.

The hydrosilylation method A) is based on the above-mentioned vinyl polymer and has a carbon-carbon double bond, for example, a (meth)acrylic acid ester/diallyl phthalate copolymer shown in JP-A-54-40893. For coalescence, etc., a hydrosilane having at least one hydrolyzable group on silicon represented by the following general formula (II) is hydrosilylated to form a silyl group.

general formula %formula%( (In the formula, R1 is an alkyl group having 1 to 10 carbon atoms.

a monovalent hydrocarbon group selected from an aralkyl group and an aryl group; 1 or 2
It is. ) Usable hydrosilanes include, for example, halogenated hydrosilanes such as trichlorosilane, methyldichlorosilane, and phenyldichlorosilane, and trimethoxysilane.

Various hydroxysilanes such as alkoxyhydrosilanes such as methyldimethoxysilane, triethoxylarane, methyljethoxysilane, and phenyldiethoxysilane, acyloxyhydrosilanes such as triacetoxysilane and methyldiacetoxysilane, and triaminooxysilane. Examples include: The amount of hydrosilane used is preferably 1 to 2 times the number of carbon-carbon double bonds in one polymer.

The catalyst used to react hydrosilanes with carbon-carbon double bonds is platinum.

Salts of Group I transition metals of the periodic table, such as rhodium, cobalt, palladium, and nickel, and their complexes are effective, specifically chloroplatinic acid and Wilkinson complexes.

Examples include cobalt carbonyl, palladium chloride, nickel chloride, and the like. Suitable reaction temperature is 70 to 120°C and reaction time is 1 to 10 hours.

In the copolymerization method B), one or two of the above vinyl monomers are used.
A silyl group is introduced by copolymerizing a polymerizable silicon compound having at least one hydrolyzable group represented by the following general formula (m) on silicon.

General formula % Formula % () (In the formula, R2 is a monovalent hydrocarbon group selected from an alkyl group, an aralkyl group, and an aryl group having 1 to 10 carbon atoms, and R3 is bonded to silicon through a carbon-silicon bond. an organic residue having a polymerizable double bond, X′ is a halogen atom,
It represents a hydrolyzable group selected from an alkoxy group, an alkoxyalkoxy group, an acyloxy group, an amino group, and an aminoxy group, and C is 0, 1 or 2. ) Can be used, for example, CI, =Cl-3i
CQ,,C)12=CH-3i(OCR,)3. C
I,=CHSi(OCzHs)3vCH.

C02=CHCOO(C)1. ), 5i(OCH,)
,.

CH, CH.

+1 Hz = Ccoo (CH2)a Sl (OCH
a) *-CH.

C11,=C=C0O(C112), 5L(OCH
I) 3°CH,=CH-Si (OCI(,CH20
CH, )a, etc. are mentioned. Copolymerization of these silane compounds and the vinyl monomers is performed using benzoyl peroxide (BPO), azobisisobutyronitrile (AIB
It can be carried out by a normal solution polymerization method using a radical initiator such as N) at a temperature of 70 to 120°C.

In the present invention, in addition to the silyl group-containing vinyl polymer described above, the following silyl group-containing polymers disclosed in JP-A-52-94353 can be used.

(a-2) Polymers into which silyl groups have been introduced by addition reaction with amine-based silane Examples of this type of polymer include epoxy resins, polyglycidyl esters, polyglycidyl etherified phenolic resins,
Epoxidized polyolefins having two or more carbon-carbon double bonds in one molecule.

(a-3) Polymer into which silyl groups are introduced by addition reaction of epoxy silane Examples of this type of polymer include polyamides and amino-containing polymers.

(b) Carboxyl group-containing polymer This type of polymer includes a carboxyl group-containing acrylic polymer synthesized from an unsaturated monomer composition containing 5% by weight or more of a carboxyl group-containing unsaturated monomer. .

It is known that a carboxyl group-containing acrylic polymer combines with a hydrolyzate of an organic silicate compound in the presence or absence of an acid catalyst to form an organic-inorganic composite (Japanese Patent Publication No. 56 -05732).

(c) Hydroxyl group-containing polymers It is known that hydroxyl-containing polymers combine with hydrolysates of organosilicate compounds in the presence of traces of acids to form organic-inorganic composites as well. be(
Special Publication No. 61-26947, Japanese Patent Publication No. 60-790.66
issue).

Examples of this type of hydroxyl group-containing polymer include vinyl chloride/vinyl acetate/vinyl alcohol terpolymer, polyhydroxyether, hydroxyl group-containing acrylic polymer, vinyl chloride/vinyl acetate/
Hydroxyalkyl acrylate terpolymer, polyester polyol.

Modiva is a block copolymer consisting of a vinyl polymer block and a fluorine-containing vinyl polymer block and containing a hydroxyl group (NOF ■Weir High Product Name,
This is a polymeric surface modifier that itself has a surface-active function).

Antistatic comprising the alcoholic silica sol-metal compound co-hydrolyzate of the present invention and a polymer containing functional groups such as silyl groups, carboxyl groups, and hydroxyl groups that can form a chemical complex with the co-hydrolyzate. The coating composition is applied to the surface of the substrate.

During heating and drying, the components of the double-wave membrane react, ie, form a chemical complex through strong siloxane bonds (Si-0-5i) or hydrogen bonds.

When there is a large amount of the functional group-containing polymer in the mixing ratio of both, the resulting film has good adhesion to the resin surface but loses antistatic properties; on the other hand, when the polymer is small, it exhibits static Although it has excellent antistatic properties, it has poor adhesion to resin surfaces. Therefore, the mixing ratio of each component is important, and in order to obtain excellent adhesion and antistatic properties, the cohydrolyzate is usually 8 parts by weight per 100 parts by weight of the solid content of the functional group-containing polymer. -110 parts by weight, with a preferred range of 20-70 parts by weight.
Parts by weight.

The reaction between the alcoholic silica sol-metal compound cohydrolyzate and the functional group-containing polymer, particularly the condensation reaction, requires an organic or inorganic acid catalyst.

However, when the co-hydrolysis of a hydrolyzable silicon compound and a metal compound is carried out under an acid catalyst, it is advantageous because the catalyst remaining in the solution acts effectively as it is.

Further, a solvent can be added at this stage to adjust the solid content. As a solvent that can be added.

Alcohols such as methanol, ethanol, and propatool, and acetate esters such as ethyl acetate and butyl acetate may be used alone or as a mixture, and a solvent 1 that dissolves with these solvents, such as toluene and xylene, may be mixed.

An antistatic product comprising the alcoholic silica sol-metal compound cohydrolyzate of the present invention prepared as described above and a functional group-containing polymer capable of forming a chemical complex with the cohydrolysis. The coating composition is applied to the surface of various substrates by a conventional coating method, such as a dipping method, a barcoding method, a roll coating method, a spinner coating method, or a spraying method.

The antistatic coating composition of the present invention has good adhesion to substrates, especially plastic surfaces, and excellent antistatic ability, and can be applied to plastic molded products by selecting various functional group-containing polymers. Easily prevents static electricity from forming on various synthetic deformed materials such as resin building materials, fibers, and films.

In particular, it is suitable for application in fields that require a high degree of anti-static properties and non-contamination properties, such as magazines (containers) for transporting semiconductor devices such as ICs and LSIs.

The mechanism by which the antistatic coating composition of the present invention exhibits the antistatic effect can be explained as follows using FIG.

FIG. 1 shows the case where the antistatic coating composition of the present invention is applied to the surface of a plastic substrate.

FIG. 2 is a conceptual diagram showing a mechanism of producing an antistatic effect.

The hydrolyzable silicon compound is hydrolyzed in an alcoholic medium to oligomerize or increase its molecular weight to become an alcoholic silica sol having some silanol groups (SL-OH) in siloxane 7114 (Si-0-3i). At that time, the conductive metal compound forms an SL-0-M (formerly known as metal atom) bond as shown in Figure 1 during the co-hydrolysis process with the hydrolyzable silicon compound. are strongly bonded. As the sol gels, a conductive layer is formed on the gelled surface.

On the other hand, a functional group-containing polymer that can form a chemical complex with an alcoholic silica sol-metal compound cohydrolyzate has a functional segment having a functional group such as a silyl group, a carboxyl group, or a hydroxyl group. The siloxane network of the siloxane network is oriented toward the silanol group side, and through the reaction with these functional groups, the two are strongly bonded, and the compatible segment part of the functional group-containing polymer that is compatible with the base polymer is oriented toward the base polymer side. It migrates or becomes oriented, is captured by the base polymer (anchoring effect, anchor effect), and comes to adhere strongly to the base polymer surface.

That is, as shown in FIG. 1, there is an inorganic polymer layer of siloxane network and a conductive layer derived from a metal compound.

It comes to strongly adhere to the surface of the base polymer through the functional group-containing polymer due to the anchoring effect, resulting in the formation of a film with extremely excellent adhesion and antistatic properties.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples, provided that the invention does not depart from the technical idea of the present invention.

The present invention is not limited to these examples in any way.
In addition, in the examples, all compounding ratios are based on weight.

[Preparation of co-hydrolysis solution]

In a flask (1000Id), IPA (isopropyl alcohol), water, concentrated hydrochloric acid, and ethyl silicate-40 (manufactured by Colcote ■, which is an ethyl polysilicate oligomer made by partially condensing tetraethyl orthosilicate so that it becomes an average of tetramer to pentamer) ).

Tin tetrachloride and antimony trichloride (this component is added as a doping agent for the purpose of improving conductivity compared to tin tetrachloride alone) are added in the composition ratios shown in Table 1 below. , cohydrolysis was carried out under stirring at 30° C. for 5 hours.

The solid content concentration of the alcoholic silica sol-metal compound co-hydrolysis solution prepared as described above is as follows.

5i02 min is 4%, SnO2 min is 2%, sb, o3
minute was 0.096%.

Table 1 (Co-hydrolysis reaction components and their composition ratios) Example 1/Comparative Example 1 15 parts of the co-hydrolysis solution, Modiper F100 (manufactured by NOF ■). MIBK solution (solid content 30%, solid content hydroxyl value 36) 0.1 part, MEK
22.5 parts.

An antistatic coating liquid was prepared by uniformly mixing 62.4 parts of MeOH (the solid content concentration of this was 0.03% for Modiper, 0.6% for Sun, and 0.6% for Sn).
O, min was 0.3% and sb, o3 min was 0.014%).

This was applied onto a vinyl chloride resin substrate by dipping, dried at 50° C. using a hot air blower (manufactured by Nishimura Electric, Model No. 0-3), and subjected to various performance tests.

In addition, for comparison, test specimens were prepared using only a coating solution that did not use Modeiper F100, that is, only an alcoholic silica sol-metal compound co-hydrolysis solution (Comparative Example 1), and various Performance tests were conducted.

The performance test was conducted as follows.

O adhesion test: A 24m cellophane tape (manufactured by Chiban@) was applied to a test piece and the paint film did not peel off when it was instantly peeled off. Those that peeled off were marked as x.

0 surface resistance value: Tokyo Denshi ■ 2 surface resistance measuring device TR-
Type 3 was used. 31g constant environment: 22℃, 45% R1+O charge decay time: ELECTRO-TIECII S
YSTEMS, Inc.

Manufactured by 5TATICDECAY METER (o+od
e1406c) was used.

To measure the decay time, immediately after placing the test piece in the llumidity Te5t Ckamdar for 24 hours, the test piece is charged with ±5 KV, and the time required for it to go from this IF charge state to 0 volts (Cut-off O%) is calculated. It was measured.

Measurement environment: 22°C, 15% RH O Nylon cloth friction test: The surface of the test piece was covered with nylon cloth.
The test was carried out by applying friction back and forth (load: 1 kg/aJ) and measuring the surface resistance values before and after the friction. Measurement environment: 22° C., 45% RHO Water resistance test: The following two measurements were performed to evaluate the water resistance test.

1) Electrostatic voltage measurement (The test piece was immersed in ion-exchanged water at 40°C for 24 hours.

Next, 5 times with nylon cloth. Re-friction and charging after 10 seconds The pressure was measured. measuring device The product is manufactured by Kasuga Denki■.

A current collector type potential measuring device KS-471 type was used. ) 1 ■ Cellotape test (The cellotape test was conducted after measuring the above-mentioned electrostatic voltage.) Evaluation criteria: 0: Surface resistance value is almost the same before and after peeling off the cellophane ×: Surface resistance after peeling off the cellophane Those with a value of 1011 or more O Solvent resistance: The test piece was immersed in MeOH for 10 minutes, and the surface resistance value before and after and the change in the coating film were visually evaluated. Room m environment: 22° C., 45% RH The results are shown in Table 2.

(The following is a blank space) Example 2 A silyl group-containing polymer was used in place of the hydroxyl group-containing polymer (Modipar F100) of Example 1.

[Preparation of silyl group-containing polymer]

A silyl group-containing polymer was prepared as follows.

Butyl methacrylate (590.6g) and γ-methacryloxypropyltrimethoxysilane (173.3g)
Dissolve AIBN (23.6 g) in the mixture with Meanwhile, xylene (337.5 g) was placed in a separable flask equipped with a cooling tube and a thermometer, and heated to 100° C. while stirring with a magnetic stirrer. The above-mentioned mixed solution was added dropwise to this over a period of 3 hours, and the mixture was then reacted for 2 hours to obtain a silyl group-containing copolymer.

[Preparation of antistatic coating liquid]

1 part of the silyl group copolymer, 9 parts of butyl acetate.

30 parts of co-hydrolyzate used in Example 1, IPA 40
Department.

An antistatic coating liquid was prepared by thoroughly stirring and mixing 20 parts of n-BuOH.

[Coating process and results]

An acrylic resin board and a vinyl chloride resin board were coated with the antistatic coating liquid in the same manner as in Example 1, and subjected to a performance test.

As a result, the surface resistance value after the water resistance test was slightly worse, but
Other performances were similar to those of Example 1 and were satisfactory.

〔Effect of the invention〕

The antistatic coating composition of the present invention has excellent adhesion to the surface of a substrate, especially a synthetic resin substrate, and
A film with excellent antistatic properties can be formed.

Therefore, it is extremely useful for synthetic resin molded products that require a high degree of antistatic property.

[Brief explanation of drawings]

FIG. 1 is a conceptual explanatory diagram showing the mechanism by which the antistatic effect is produced when the antistatic coating composition of the present invention is applied to the surface of a plastic substrate.

Claims (1)

[Scope of Claims] 1. (i) an alcoholic silica sol-metal compound co-hydrolyzate obtained by co-hydrolyzing a hydrolyzable silicon compound and a co-hydrolyzable metal compound in an alcohol solvent; (ii) ) a functional group-containing polymer capable of forming a chemical complex with the cohydrolyzate; (iii) an acid catalyst if necessary. 2. The antistatic coating composition according to claim 1, wherein the hydrolyzable silicon compound is an organic silicate. 3. The antistatic coating composition according to claim 1, wherein the cohydrolysis is carried out in the presence of an acidic catalyst. 4. The antistatic coating composition according to claim 1, wherein the co-hydrolyzable metal compound is a tin compound. 5. The antistatic coating composition according to claim 4, wherein the tin compound is tin chloride. 6. The antistatic coating composition according to claim 1, wherein the functional group-containing polymer is a silyl group-containing polymer. 7. The antistatic coating composition according to claim 1, wherein the functional group-containing polymer is a carboxyl group-containing polymer. 8. The antistatic coating composition according to claim 1, wherein the functional group-containing polymer is a hydroxyl group-containing polymer.