JPH028284A - Composition capable of forming water repellent coating film - Google Patents

Abstract

PURPOSE:To obtain a composition capable of forming a coating film having excellent water repellency from polytetrafluoroethylene film by using a fluoroalkyl group-containing polymer, silicon-containing polymer and granular material as main components. CONSTITUTION:The aimed composition containing (A) a (co)polymer consisting of (i) 5-100wt.% fluoroalkyl group-containing (meth)acrylic monomer expressed by formula I [R1 is H or methyl; l is 1-11; Rf is-CmF2m+1 or-CnF2nH (m and n are 1-20)] and 0-95wt.% unsaturated monomer copolymerizable with the component (i), (B) a copolymer consisting of (iii) 0.1-75wt.% silicon-containing polymerizable unsaturated monomer expressed by formula II [R2 is H or methyl; R3 is formulas III-V (j is 0 or 1; k is 0-6; p is 1-5; q is 1-20; r is 0-20, s is 1-3 and r+s=3)] and (iv) 25-99.9wt.% unsaturated monomer copolymerizable with the component (iii) and (C) a granular material having <=5/mum average particle size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a composition capable of forming a water-repellent film, the main components of which are a fluoroalkyl group-containing polymer, a silicon-containing polymer, and granules.

[Prior art and problem 1 Typical examples of water-repellent materials include hydrocarbon-based polymer materials such as polyethylene, fluororesin-based polymer materials such as polytetrafluoroethylene, and silicon-based polymers. The materials etc. are known.

Among them, polytetrafluoroethylene has a ``contact angle with water'', which is one measure of the degree of hydrophobicity, of approximately 1
The angle is about 20°, and it is a particularly highly hydrophobic material (low polar component of surface tension).

However, even polytetrafluoroethylene has a problem in that its water repellency is still insufficient depending on the environmental conditions in which it is used, and there is a desire to develop a material with even higher water repellency.

[Disclosure of the Invention] Therefore, the present inventors conducted intensive research to satisfy these social needs, and as a result, they found that the "contact angle with water" is 140° or more and the "contact angle with paraffin" is 140° or more. A composition that exhibits a larger angle at the angle than that of polytetrafluoroethylene film (lower value of surface tension dispersion component than polytetrafluoroethylene) and is capable of forming a film with better water repellency than polytetrafluoroethylene film. I ended up developing something.

That is, the present invention provides the following general formula (I): CHz=CCO(CH2), 2 Rf (I) In the formula, R1 represents a hydrogen atom or a methyl group, and Q is 1 to 11
Rf is an integer of C,%F2. R+1 or -〇,
F,,H, where m is an integer of 1 to 20, and n is an integer of 1 to 20; A (co)polymer consisting of 0 to 95% by weight of an unsaturated monomer copolymerizable with the fluoroalkyl group-containing (meth)acrylic monomer, (2) the following general formula (n) CHz-CRs (II) formula where R2 represents a hydrogen atom or a methyl group, R1 represents a group represented by the following formula, where j is an integer of 0 or l, k is an integer of 0 to 6, and p is an integer of 1 to 5. is an integer of 1 to 20, q is an integer of 1 to 20, r is an integer of 0 to 2, S is an integer of 1 to 3, and r+s=3. Saturated monomer 0゜1~7
5% by weight and 25 to 99.9% by weight of an unsaturated monomer copolymerizable with the silicon-containing polymerizable unsaturated monomer, and (1) Contains granules with an average particle diameter of 5 μm or less. The present invention provides a composition capable of forming a water-repellent film.

The composition capable of forming a water-repellent film in the present invention includes the above-mentioned (1),
The main components are three components (1) and (2), where the component (2) is a fluoroalkyl group-containing (
It is a homopolymer or copolymer of a meth)acrylic monomer, or a copolymer of the fluoroalkyl group-containing (meth)acrylic monomer and an unsaturated monomer copolymerizable therewith.

■Fluoroalkyl group-containing (meth) used for polymerization of components
The acrylic monomer has the following general formula (I) CHx-CCO
(cH2)Q Rf (I) In the formula, R represents a hydrogen atom or a methyl group, α is an integer of 1-11, preferably 1-5, and Rf is 10, 1F 3m+ 1 or -
C, F 2. H, where m is an integer of 1 to 20, preferably 2 to 1O, and n is an integer of 1 to 20, preferably 2 to 1O, a fluoroalkyl group-containing (meth)acrylic system represented by A monomer (hereinafter referred to as "monomer of formula (I)"),
For example, 2-perfluorooctylethyl methacrylate CH.

CHz= CCOOCHICH* CaF rt
, 2-perfluoroinnonylethyl methacrylate CH3CF.

/ CHz=C-Coo-CHtCJ-(CFz)acF\ C.F.

2-Perfluorononylethyl methacrylate, 2-perfluorodecyl ethyl methacrylate, 2-perfluorobutyl ethyl methacrylate, perfluoromethylmethyl methacrylate, perfluoroethyl methyl methacrylate, perfluorobutyl methyl methacrylate, perfluorooctyl methyl methacrylate, perfluoro Decyl methyl methacrylate, perfluoroethyl methyl methacrylate, perfluoroethyl methyl methacrylate, perfluorooctylpropyl methacrylate, perfluorooctyl amyl methacrylate,
Perfluoroalkylalkyl methacrylates having a perfluoroalkyl group having 1 to 20 carbon atoms, such as perfluorooctyl undecyl methacrylate, and perfluoroalkylalkyl acrylates in which the above methacrylates are replaced with acrylates; ) (meth)acrylates in which one fluorine atom is replaced with a hydrogen atom in the perfluoroalkyl group of the acrylate, such as 2-hydrodiene hexafluoropropylmethyl acrylate CH, TomiCH-Coo-CH2CFICFHCF3.4
-hydrodiene octafluorobutyl methyl methacrylate, 6-hydrociendodecafluorohexyl methyl methacrylate, 8-hydrodiene hexadeca 7
Examples include fluorooctyl methyl acrylate, thyl methyl methacrylate, and particularly preferred among these are 2-perfluorooctyl ethyl methacrylate and 2-perfluoroisononylethyl methacrylate.

Examples of unsaturated monomers copolymerizable with the monomer of formula 0 (hereinafter referred to as "comonomers") include methyl acrylate, ethyl acrylate, propyl acrylate, inglovir acrylate, Butyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, urinoacrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butino-methacrylate, hexyl methacrylate, methacrylate CI~1.Alkyl esters of (meth)acrylic acids such as 2-ethylhexyl acid, octyl methacrylate, lauryl methacrylate; glycidyl acrylate, glycidyl methacrylate; methoxybutyl acrylate, methoxybutyl methacrylate, methoxyethyl acrylate, methacrylic acid 02-1.alkoxyalkyl esters of (meth)acrylic acids such as methoxyethyl, ethoxybutyl acrylate, and ethoxybutyl methacrylate; C, -3 alkenyl esters of (meth)acrylic acids such as allyl acrylate and allyl methacrylate; hydroxy 02~.Hydroxyalkyl esters of (meth)acrylic acids such as ethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate; ) Aminoalkyl ester of acrylic acid, acrylamide, methacrylamide: acrylic acid, methacrylic acid; formula R1 represents a methyl group or a hydrogen atom, and q is an integer of 1 to 50. Methyl silicones, e.g. γ-(meth)acryloxypropyl polymethyl silicon; e.g. CH, =CH-C-0+-cHT+rOCH* CF
, (meth)acrylic acid-based unsaturated monomers such as fluoroethers having a (meth)acryloxy group; , methacrylonitrile, acrolein, methacrolein, butadiene, isoprene, and other unsaturated monomers other than acrylic unsaturated monomers.

Among these comonomers, preferred are (meta)
Included are alkyl esters of acrylic acid and styrene.

(1) The proportion of the monomer of formula (1) and comonomer used in the production of the component is 5 to 100% by weight of the monomer of formula (I), preferably 5 to 100% by weight, based on the total amount of both. 40-100% by weight, and 0-95% by weight of comonomer, preferably 0-60%
If the amount of the monomer of formula (I) used is less than 5% by weight, it is generally difficult to expect a sufficient water repellent effect.

(2) To produce the component (co)polymer, the above monomer components are polymerized by a method known per se, for example, a method similar to the method for producing ordinary acrylic resins, and either solution polymerization or emulsion polymerization is used. The method described above can be adopted, and the solvent used is preferably a solvent that is a good solvent for the obtained polymer, such as trichlorotrifluoroethane, meta-xylene hexafluoride, tetrachlorohexafluorobutane, etc. As the polymerization initiator, common peroxides or azo compounds such as benzoyl peroxide, azoisobutylvaleronitrile, azobisisobutyronitrile, etc. are used, and the reaction temperature is generally preferably 40 to 140°C.

The (co)polymer of component (1) in the present invention is usually about 3.0
00 to about 500,000, even about 5,000 to about 4
Preferably, it has a number average molecular weight in the range of 5,000. When the number average molecular weight is about 500,000 or more, it becomes difficult to form a phase-separated structure during film formation, and on the other hand, when the number average molecular weight is about 3,000 or less, the phase-separated structure changes rheologically after film formation. There is a tendency for water repellency and its durability to be impaired.

Component (1) in the composition of the present invention is represented by the general formula (I[)
It is a copolymer of a silicon-containing polymerizable unsaturated monomer represented by and an unsaturated monomer copolymerizable with the silicon-containing polymerizable unsaturated monomer.

■The silicon-containing polymerizable unsaturated monomer used in the polymerization of the component has the following general formula (I[) GHz-CRs (n), where R
2 represents a hydrogen atom or a methyl group, R1 represents a group represented by the following formula, where j is an integer of 0 or l, k is an integer of 0 to 6, and p is an integer of 1 to 5. , q is an integer of 1 to 20, r is an integer of 0 to 2, S is an integer of 1 to 3, and r+s=3. Saturated monomer (hereinafter referred to as “
Monomer of formula (■)"), such as vinyltrimethoxysilane, vinyltriethoxysilane, γ-acryloxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilantyldimethoxysilane, vinylmethyldimethoxysilane Examples include silane, vinyldimethylmethoxysilane, γ-methacryloyloxypropyldimethylmethoxysilane, and among them γ-methacryloyloxypropyltrimethoxysilane and γ-methacryloyloxypropylmethyldimethoxysilane are preferred.

The unsaturated monomers copolymerizable with the monomer of formula (ff) above include the unsaturated monomers described as comonomers copolymerizable with the monomer of formula (I) in the production of component (1) above. Examples of monomers include alkyl esters of (meth)acrylic acid and styrene.

(2) The monomer of the formula (If) used in the production of the component and the (
If the proportion of the monomer of the formula (■) and the unsaturated monomer copolymerizable with the monomer of the formula (■) is based on the total amount of both, the monomer of the formula (■) is 0.
．． 1 to 75% by weight, preferably 0.1 to 40% by weight, and 25 to 99.9% by weight of the copolymerizable unsaturated monomer,
It is preferably in the range of 60 to 99.9% by weight, and (II
) If the amount of the monomer of the formula is less than 0.1% by weight, the curing property will usually be poor and the dispersion of particulate matter will not be achieved well, while if it exceeds 75% by weight, silanol will be produced due to hydrolysis of the silylalkoxy group. There is a tendency that many groups are formed and hydrophobicity cannot be maintained.

■Production of the component copolymer can be carried out using a polymerization method known per se, for example, a solution polymerization method similar to that used in the production of ordinary acrylic resins. Specifically, a small amount of alcohol is added to the polymerization solution. It is preferable to blend a system solvent and carry out the polymerization in the presence of a polymerization initiator such as a peroxide or an azo compound.

The copolymer of component (2) in the present invention generally has a molecular weight of about 4.00
0 to about 200,000, even about 8,000 to about 70
．． It is preferred to have a number average molecular weight in the range of 0.000.

Component (1) in the composition of the present invention has an average particle diameter of 5 μm.
Below, preferably 3μm or less, more preferably 111m
The following particles may be either organic fine particles or inorganic fine particles, but they must be present in the coating film as particulates after the coating film is formed.

Examples of such particles include fine silica powder, fine fluorocarbon powder, carbon black, etc. Among them, fine silica powder is preferred, and in particular, the surface is coated with silazane [(CHs)sSi-N-3t(CHs)]. Fine silica powder that has been hydrophobized with a hydrophobizing compound such as a] is suitable.

Furthermore, by blending true spherical fine particles such as true spherical fine silica particles, the smoothness of the surface of the resulting coating film can be improved.

If particles with an average particle diameter of more than 5 μm are used as the component (2), when formed into a coating film, the microscopic surface irregularities of the coating film tend to increase and the water repellency tends to decrease.

In the present invention, the proportions of component (■), component (2), and component (■) are not particularly limited;
From the viewpoint of water repellency and physical properties of the resulting coating film, it is preferable to blend in the range of 600 parts by weight, particularly 50 to 200 parts by weight. In addition, the ratio of the component to the ■component is usually 97.5:2.5 to 30 near 0 in weight ratio of the ■component:■component.
Preferably, the ratio is within the range of 97.5:2.5 to 50:50, which is advantageous from the viewpoint of water repellency and dispersibility of particles.

In addition to the above-mentioned three components (1), (2), and (3), the composition of the present invention may optionally contain, for example, a solvent, a coloring agent such as a pigment, a surfactant, etc., which are commonly used in paints. Additives may also be included as appropriate.

The composition of the present invention can be prepared by mixing the components (1), (2), and (2) described above, and, if necessary, the additives described above. As the mixing means, a commonly used stirring method or dispersion method can be employed, and for example, a day silver steel ball mill, a pebble mill, a sand mill, an attritor, etc. can be used.

The composition capable of forming a water-repellent film of the present invention includes, for example, metal,
It can be applied directly to the surface of base materials such as plastics, glass, and wood materials, and it can also be applied as a top coat onto coatings previously formed on these base materials. Further, the composition of the present invention can also be used as a finished product by being laminated onto the surface of an object.

As a method for applying the composition of the present invention onto the above-mentioned substrate, any known coating means such as spray coating, brush coating, roller coating, etc. can be used. Further, the composition of the present invention usually has a dry film thickness of 1 to 50
A good film can be obtained by coating so that the particle size is preferably 10 to 30 μm, and drying at a temperature ranging from room temperature to 130°C.

[Operations and Effects] The surface of the coating formed from the composition of the present invention shows irregularities on the order of microns when viewed in a microscopic photograph.
It has been found from SCA analysis that C--F bonds are very abundantly distributed on the surface.

Furthermore, the surface energy γ can be calculated from the contact angle using the following formula: % formula %
) θ: Contact angle of paraffin θ: Calculated from the contact angle of water, but the surface energy γ of the film formed using the composition of the present invention is 4.2 mN/m or less, indicating low surface energy. Teflon (γ is approximately 21m)
N/m). This is thought to suggest the relationship between surface shape and apparent contact angle proposed by Wenzel et al. On a surface with such low surface energy, the amount of water droplets adhering to it is extremely small.
Furthermore, since the water droplets are spherical, they are quickly detached.

Since the surface of the film formed from the InI'R material of the present invention has the above-mentioned properties, the composition of the present invention has properties such as waterproofing, snowproofing, waterproofing, and prevention of current short circuits caused by moisture. It will be of great help in this field.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Note that the scope of the present invention is not limited to the examples. In the following, "parts" and "%" mean "parts by weight" and "% by weight", respectively.

Production Example 1 350 parts of 2-perfluorooctylethyl methacrylate (hereinafter referred to as F17M), 150 parts of 2-perfluorooctylethyl acrylate (hereinafter referred to as F17A), and 8 parts of hexachloromethacykylene (hereinafter referred to as HFMX)
0 part was accurately weighed into a 112 flask and mixed by stirring well to obtain a mixed solution of 7gr and the solvent. The mixture was transferred to a 14 addition funnel. A four-necked 1Q flask equipped with a water-cooled tube, a thermometer, and a stirring device was prepared, a 1 part dropping funnel containing the mixed liquid was loaded, and 200 parts of the mixed liquid was transferred to the four-necked flask. While stirring, increase the temperature to 105-11
The temperature was raised to 0°C, then maintained at this temperature, and the polymerization initiation catalyst bisazoisobutyronitrile (hereinafter referred to as AIBN)
0.8 part of was added [at this time, heat is generated, so the reaction system must be set up so that the flask can be cooled],! Then, the mixed solution was added dropwise from the dropping funnel at a rate of 50 cc/15 minutes. Additionally, 0.2 parts of /MBN was added every 15 minutes. After 20 minutes had passed after the completion of the dropwise addition, 134 parts of HFMX was added to the flask, the temperature was raised to and maintained at 115° to 120°C, and parts by weight of AIENO-5 were added every 30 minutes five times. 1 hour and 30 minutes after the final addition of AIBN, cooling of the flask was started, and after the temperature was below 60°C, 286 parts by weight of HFMX was added as a diluting solvent to further dilute the reaction, and the reaction was completed. did.

The obtained fluoroalkyl group-containing copolymer resin liquid was pale yellow in color and had a Gardner viscosity of 48.7% in F1 unfiltered content.

Production Example 2 280 parts of F■7M as a mixed solution of Shitsummer and a solvent;
The reaction was carried out in the same manner as in Production Example 1 except that a mixed solution of 140 parts of F, 80 parts of styrene and 80 parts of H7A FMX was used. The resulting resin liquid was pale yellow in color, had a Gardner viscosity of EF1, and had a nonvolatile content of 48.5%.

Production Example 3 320 parts of F17M as a mixed solution of Shitsummer and a solvent,
175 parts of F, 5 parts of 2-hydroxyethyl acetate 17A acrylate, I (using a mixture of 70 parts by weight of FMX and 10 parts of butyl acetate, HFMX25 as a diluting solvent)
The reaction was carried out in the same manner as in Production Example 1, except that 0 parts and 36 parts of n-butyl alcohol were used. The resulting resin liquid was pale yellow in color and had a Gardner viscosity G1 nonvolatile content of 49.1%.

Production Example 4 200 parts of F17A, 200 parts of t-butyl methacrylate, 100 parts of methacrylic acid, 50 parts of HFMX and 30 parts of n-butyl alcohol were accurately weighed in a 1Q7 flask, stirred and mixed well, and further added polymerization initiator A I BN6. 1 part was added and dissolved to obtain a mixed solution of the 7mer 1 solvent and the polymerization initiator. This mixture was transferred to an IQ dropping funnel. Prepare a four-necked 2Q flask equipped with a water-cooled tube, a thermometer, and a stirrer, and add 100 parts by weight of HFMX and 1 part of butyl acetate.
53 parts by weight was added and the temperature was maintained at 110°C.

Next, while maintaining this temperature, the mixed solution was dropped into the flask from the dropping funnel over a period of 2 hours. One hour after the completion of the dropwise addition, a mixed solution of 1 part of AIBN and 170 parts of butyl acetate was added dropwise over a period of 1 hour and 30 minutes. After the dropwise addition was completed, the temperature was raised to 120°C, and after reaction for 2 hours, it was cooled. The resulting resin liquid was slightly yellowish, had a Gardner viscosity of N1, and had a nonvolatile content of 50%.

Production Example 5 I-
A mixed solution of 200 parts of butyl acrylate, 100 parts of lauryl methacrylate, 200 parts of γ-methacryloyloxypropyltrimethoxysilane, 33 parts of n-butyl alcohol, and 7.5 parts of AIBN was used, and acetic acid was used as the solvent initially placed in the 2Q flask. The reaction was carried out in the same manner as in Production Example 4 except that 200 parts of butyl and 100 parts of n-butyl alcohol were used. The obtained silicon-containing copolymer resin liquid was colorless and transparent, and had a Gardner viscosity P1 and nonvolatile content of 51.0%.

Production Example 6 As a mixed solution of Seventhmer 1 solvent and polymerization initiator, 200 parts of inbutyl acrylate, 100 parts of styrene, methyl methacrylate, 190 parts of rylate, 10 parts of vinyltrimethoxysilane, 33 parts of n-butyl alcohol, and AI
The reaction was carried out in the same manner as in Production Example 5 except that a mixed solution containing 7.5 parts of BN was used.

The obtained resin liquid was colorless and transparent, and had a Gardner viscosity v1 and nonvolatile content of 51.2%.

Example 1 100 parts of silicon-containing copolymer resin liquid obtained in Production Example 5,
100 parts of the fluoroalkyl group-containing copolymer resin liquid obtained in Production Example 1, 600 parts of 1,2-trichloro-1,2,2-trifluoroethane, 600 parts of HFMX, and 30 parts of hydrophobic silica A (Note 1). and dispersed in a shaker to obtain a composition.

(Note 1) Hydrophobic silica A: Hydrophobic silica fine powder with an average particle size of approximately 0.1 μm, manufactured by Talco, Inc. in the United States, trade name “Talnox-”
500".

Examples 2 to IO and Comparative Examples 1 and 2 The compositions of Examples 2 to IO and Comparative Examples 1 and 2 were obtained by processing in the same manner as in Example 1, except that the formulations shown in Table 1 below were used.

Method for preparing test plates Examples 1 to 11 were prepared on aluminum plates treated with chromium phosphate.
The compositions obtained in Comparative Examples 1 and 2 were each air-sprayed to a dry coating weight of approximately 30 g/m'', and then left to dry at room temperature for 24 hours to obtain test plates.

Tests were conducted on each test plate. The test results are shown in Table 1 below.

Comparative Example 3 Comparative Example 3 was prepared by laminating a polytetrafluoroethylene film onto an aluminum plate.

The test results are shown in Table 1 below.

Notes in Table 1 are as follows.

(*1) Hydrophobic silica B: True spherical hydrophobic silica fine powder with an average particle size of about 2.0 μm, manufactured by Toshiba Silicone Co., Ltd., trade name “Tospearl”.

(*2) Untreated silica C: Untreated silica fine powder that has not been subjected to hydrophobization treatment and has an average particle size of approximately 0.1 μm.

(*3) Fluorocarbon: Alurocarbon fine powder with an average particle size of approximately 0.3 μm.

(*4) Untreated silica D: untreated silica fine powder with an average particle size of about 7 μm that has not been subjected to hydrophobization treatment, manufactured by Fuji Devison Co., Ltd., trade name “Syroid 308”.

(*5) Contact angle with water: Drop 0.03 cc of deionized fishing rod as a water drop onto the painted surface of a horizontal test plate using a syringe, and measure the contact angle between the water drop and the painted surface after 1 minute of dropping. Measurement was performed using a contact tan gel meter manufactured by Kaimen Kagaku Co., Ltd.

(*6) Contact angle with paraffin: In the above (*5) contact angle with water, use liquid paraffin instead of deionized water, and the contact angle between liquid paraffin and the painted surface after 4 minutes of dropping. Measurements were made in the same manner except that .

(*7) Sliding property of water droplets: 0°0 with a syringe on the test coated plate
3 cc of deionized water was added dropwise to create water droplets. Next, the plate was tilted and the angle of inclination of the plate at which the water droplets slid down was read.

Evaluation standard 01 Falling at less than 200 ■: Falling at 20° to less than 40° △: Falling at 40° to 60'' ) Moon Tsuyoshi 1, Indication of the case Patent Application No. 157939 of 1988 2, Name of the invention Composition capable of forming a water-repellent film 3, Person making the amendment Relationship to the case Name of patent applicant (140) Kansai Paint Co., Ltd. Company 4, Agent 〒107 (1) On page 18, line 18 of the specification: ``It is possible.''

After that, add the following sentence.

rThe composition of the present invention is effective in preventing clogging due to adhesion of condensed water, frost, ice, etc. to the fin material, for example, by applying it to the fin material of a heat exchanger and drying it, thereby preventing a decrease in heat exchange efficiency. can be prevented. Furthermore, by applying and drying the composition of the present invention on an insulator for high-voltage power transmission lines, it is possible to prevent current short circuits caused by wind, flood, or salt damage. ” 56 Date of amendment order None 6. Subject of amendment as shown in the attached sheet.

Claims (1)

[Claims] 1. (a) The following general formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) In the formula, R_1 represents a hydrogen atom or a methyl group, and l is 1
~11 integer, Rf is -C_mF_2_m_+_1 or -C_mF_2
_nH, where m is an integer from 1 to 20, and n
is an integer of 1 to 20, 5 to 100% by weight of a fluoroalkyl group-containing (meth)acrylic monomer represented by and unsaturated copolymerizable with the fluoroalkyl group-containing (meth)acrylic monomer A (co)polymer consisting of 0 to 95% by weight of monomers, (b) General formula (II) below ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼ (II) In the formula, R_2 represents a hydrogen atom or a methyl group. , R_3
represents a group represented by the following formula ▲There are mathematical formulas, chemical formulas, tables, etc.▼, where j is an integer of 0 or 1, k is an integer of 0 to 6, and p is an integer of 1 to 5. q is an integer of 1 to 20, r is an integer of 0 to 2, s is an integer of 1 to 3, and r+s=3, a silicon-containing polymerizable unsaturated monomer represented by Body 0.1-7
5% by weight and 25 to 99.9% by weight of an unsaturated monomer copolymerizable with the silicon-containing polymerizable unsaturated monomer, and (c) granules with an average particle diameter of 5 μm or less. A composition capable of forming a water-repellent film, comprising: 2. The composition according to claim 1, containing 20 to 600 parts by weight of component (c) based on 100 parts by weight of the total amount of components (a) and (b). 3. The composition according to claim 1 or 2, containing component (a) and component (b) in a weight ratio of (a):(b) in the range of 97.5:2.5 to 30:70.