JPH028285A - 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 a polytetrafluoroethylene film by using a fluoroalkyl group-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 the formula [R1 is H or methyl; l is 1-11; Rf is-CmF2m+1 or-CnF2nH (m and n are 1-20) and (ii) 0-95wt.% unsaturated monomer copolymerizable with the component (i) and (B) a granular material having <=5mum average particle size (preferably silica fine particle having <=3mum average particle size).

Description

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

[Prior art and staff] Typical water-repellent materials include, for example, hydrocarbon polymer materials typified by polyethylene, fluororesin polymer materials typified by polytetrafluoroethylene, and silicone polymer materials. Molecular materials and the like 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, polytetrafluoroethylene still has the problem of insufficient water repellency depending on the environmental conditions in which it is used, and there has been a desire to develop a material with higher water repellency.

[Disclosure of the Invention 1] Therefore, as a result of intensive research to satisfy these social needs, the present inventors have found that the "contact angle with water" is 140° or more, and [with paraffin] The contact angle is larger than that of polytetrafluoroethylene film (the dispersion component of surface tension is lower than that of polytetrafluoroethylene), and it can form a film with better water repellency than polytetrafluoroethylene film. This led to the development of a composition.

That is, the present invention is based on the following general formula (1), where R represents a hydrogen atom or a methyl group, and a represents 1-
11 integer, and Rf is −(,F,−,.

Or -〇, F2. H, where m is 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 A composition capable of forming a water-repellent film, characterized by containing a (co)polymer consisting of 0 to 95% by weight of a copolymerizable unsaturated monomer, and (1) granules having an average particle diameter of 5 μm or less. It provides:

The composition capable of forming a water-repellent film in the present invention has two components (1) and (2) as main components, and the component (2) is a fluoroalkyl group-containing (meth) represented by the general formula (I)
It is a homopolymer or copolymer of an acrylic monomer, or a copolymer of the fluoroalkyl group-containing (meth)acrylic monomer and an unsaturated monomer capable of copolymerizing it.

■Fluoroalkyl group-containing (meth) used for polymerization of components
The acrylic monomer has the following general formula (I), where R represents a hydrogen atom or a methyl group, and α represents 1-11. Preferably it is an integer of 1 to 5, and Rf is -C□F. 1 or -
C, F2. H, where m is an integer from 1 to 20, preferably from 2 to 10, and n is from 1 to 20, preferably 2.
A fluoroalkyl group-containing (meth)acrylic monomer represented by (hereinafter referred to as "monomer of formula r(I)"), which is an integer of ~10, for example, 2-perfluorooctylethyl methacrylate. CH.

CH2±C-Coo-CH2CH2-CaF1r2-perfluoroisononylethyl methacrylate\CF.

2-Perfluorononylethyl methacrylate, 2-perfluorodecyl ethyl methacrylate, 2-perfluorobutyl ethyl methacrylate, perfluoromethylmethyl methacrylate, perfluoroethyl methyl methacrylate, perfluorobutyl methyl methacrylate, perfluorooctyl methyl methacrylate, perfluoro Perfluorocarbons having a perfluoroalkyl group having 1 to 20 carbon atoms, such as decylmethyl methacrylate, perfluoroethylmethyl methacrylate, perfluoropropylpropyl methacrylate, perfluorooctylpropyl methacrylate, perfluorooctyl amyl methacrylate, and perfluorooctyl undecyl methacrylate. Alkylalkyl methacrylates and perfluoroalkylalkyl acrylates obtained by replacing the above methacrylates with acrylates; and (meth)acrylates in which one fluorine atom is replaced with a hydrogen atom in the perfluoroalkyl group of these perfluoroalkylalkyl (meth)acrylates. kind, for example 2
-Hydrodiene hexafluoropropyl methyl acrylate CHt=CH-Coo-CHz-CFzCFHCF3.
Examples include 4-hydrodiene octafluorobutyl methyl methacrylate, 6-hydrodiene decafluorohexyl methyl methacrylate, 8-hydrodiene hexadecafluorooctyl methyl acrylate, 2-hydrodiene tetrafluoroethyl methyl methacrylate, and especially Preferred are 2-perfluorooctylethyl methacrylate and 2-perfluoroisononylethyl methacrylate.

Examples of unsaturated monomers copolymerizable with the monomer of the above formula (I) (hereinafter referred to as "comonomers") include: ■ The following general formula (II) CHz -CRs, (II
) In the formula, R1 represents a hydrogen atom or a methyl group, R3 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 1 is an integer of ~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 Examples include oxyglopylmethyldimethoxysilane, vinylmethyldimethoxysilane, vinyldimethylmethoxysilane, γ-methacryloyloxypropyldimethylmethoxysilane, among others γ-
Methacryloyloxypropyltrimethoxysilane, γ
-methacryloyloxyglopylmethyldimethoxysilane is preferred.

Other copolymers include, for example, ■ methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate,
hexyl acrylate, 2-ethylhexyl acrylate,
Octyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, hexyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, lauryl methacrylate, etc.
C1-C1m alkyl esters of meth)acrylic acid: glycidyl acrylate, glycidyl methacrylate; )02-CI8 alkoxyalkyl ester of acrylic acid; C2-, alkenyl ester of (meth)acrylic acid such as allyl acrylate and allyl methacrylate; ) 02-8 hydroxyalkyl esters of acrylic acid; aminoalkyl esters of (meth)acrylic acids such as dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, acrylamide, methacrylamide; acrylic acid, methacrylic acid ; Formula [wherein, R4 represents a methyl group or a hydrogen atom, and q is 1
(meth)acryloxyalkylpolymethylsilicone represented by 1 which is an integer of ~50; e.g. γ-(meth)acryloxypropylpolymethylsilicon; e.g. CH2=CH-C-(X
-CH2-)20CH, CF, and other (meth)acrylic acid-based unsaturated monomers such as fluoroethers having (meth)acryloxy groups; styrene,
Unsaturated monomers other than acrylic unsaturated monomers such as vinyltoluene, acrylonitrile, methacrylaterile, acrolein, methacrolein, butadiene, and isoprene can be mentioned.

Among the above comonomers (1), alkyl esters of (meth)acrylic acid and styrene are preferred.

■The polymerization ratio of the monomer of formula (I) and the comonomer in the copolymer is 5 to 100% by weight, preferably 40 to 100% by weight of the monomer of formula (I) based on the total amount of both. 100% by weight, and comonomer 0-95% by weight, preferably 0-60% by weight
If the monomer of formula (1) is less than 5% by weight, the water repellency of the resulting coating film will generally not be sufficient. More specifically, the polymerization ratio of the monomer of formula (I) and comonomers ■ and ■ is based on the total amount of the monomer of formula (T) and comonomers ■ and ■, Monomer of formula (I): Comonomer ■((■
) silicon-containing polymerizable unsaturated monomer represented by the formula): comonomer (2) in a weight ratio of (5 to 99°9) + (0,1 to
75): (0-94.9), especially (30-97.5
): (2,5-50): (0-67.5) is convenient.

■Ingredients (together)! ! The polymerization of the above-mentioned monomer components for producing the composite is carried out 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 can be employed. As the solvent, those which are good solvents for the obtained polymer, such as trichlorotrifluoroethane, metaxylene hexafluoride, and tetrachlorohexafluorobutane, are preferably used. As the polymerization initiator, common peroxides or azo compounds such as benzoyl peroxide, azoisobutylvaleronitrile, azobisisobutyronitrile, etc. are used. The reaction temperature is generally 40 to 140°C, but preferably.

The (co)polymer which is component (1) in the present invention is usually about 3,
It is preferred to have a number average molecular weight ranging from 0.000 to about soo, ooo, and even from about 5.000 to about 45.000. 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 has an average particle diameter of 5 μm.
The following particles are preferably 3 μm or less, more preferably 1 μm or less, and the granules may be either organic fine particles or inorganic fine particles, but they are present in the coating film as granules after the coating film is formed. It is necessary.

Examples of such granules include fine silica powder, fine fluorocarbon powder, fine carbon black powder, etc. Among them, fine silica powder is preferable, and in particular, the surface is coated with silazane [(CHxhSi-N-5i(CHs) Fine silica powder that has been hydrophobized with a hydrophobizing compound such as [Z] 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 a particulate material having an average diameter of more than 5 μm is used as a component, 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 blending ratio of component (1) and component (2) is not particularly limited; It is preferable to use within the range of 200 parts by weight from the viewpoint of water repellency and dispersibility of particulate matter.

In addition to the above-mentioned two components (1) and (2), the composition of the present invention includes:
If necessary, additives commonly used in paints, such as a solvent, a coloring agent such as a pigment, and a surfactant, can also be appropriately included.

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

The composition capable of forming a water-repellent film of the present invention can be applied directly to the surface of a base material such as metal, plastic, glass or wood material, or can be applied onto a coating film previously formed on these base materials. It is also possible to apply it as a top coat. Further, the composition of the present invention can also be used as a molded article by laminating it on the surface of an object.

As a method for applying the composition capable of forming a water-repellent film of the present invention onto the above-mentioned substrate, 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 the film so that the thickness is preferably in the range of 10 to 30 μm, and drying at a temperature in the range of 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 calculated from the contact angle is calculated using the following formula: The surface energy γ is less than 4.2 mM/m, and Teflon (γ is about 21
(mM/m). This is thought to suggest the relationship between surface shape and apparent contact angle proposed by Wentzel et al. On a surface having such a low surface energy, the amount of water droplets adhering to the surface is very small, and since the water droplets have a spherical shape, they are quickly detached.

Since the surface of the coating formed from the composition of the present invention has the above-mentioned properties, the composition of the present invention can be used for waterproofing, snowproofing,
It is extremely useful in fields such as anti-icing and prevention of current short circuits caused by moisture.

[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, "part" and "1%" mean "part by weight" and "% by weight", respectively.

Production example of fluoroalkyl group-containing copolymer 1 2-perfluorooctylethyl methacrylate 350
1 part, 2-perfluorooctylethyl methacrylate
25 parts of γ-methacryloyloxypropyltrimethoxysilane and 80 parts of hexafluorometa-xylene (hereinafter referred to as HFMX) were accurately weighed and mixed well in a dropping funnel to form a mixture of 7-methacryloyloxypropyltrimethoxysilane and a solvent. Obtained. Separately, a four-mouthed 1 (2
7 flasks were prepared, and a dropping funnel containing the above-mentioned liquid mixture was loaded therein. Next, 200 parts of the mixed solution was poured into the flask through the dropping funnel, heated to 105 to 110°C, and maintained at this temperature. Polymerization catalyst azobisisobutyronitrile (
0.8 part (hereinafter referred to as AIBN) was accurately weighed and added to a four-necked flask (at this time, heat was generated, so it was necessary to set up a reaction system so that the flask could be cooled).Next, 50 cc/ml was added from the dropping funnel. The mixture was added dropwise at a rate of 15 minutes.

Additionally, 0.2 m of /MBN was added every 15 minutes. After 20 minutes had passed after the completion of the dropwise addition, 34 parts of HFMX1 was added to the flask, and the temperature was maintained at 110 to 115°C. Then, 5 parts by weight of AIBNo was added 5 times every 30 minutes. Two hours after the final addition of AIBN, the flask was cooled to below 60°C and HFMX was added as the diluting solvent.
286 parts were added to complete the reaction.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity EF1 nonvolatile content of 48.3%.

Production example 2 2-perfluorooctylethyl methacrylate 20
0 parts, 2-perfluoropropylethyl acrylate 2
00 parts, 100 parts of γ-methacryloyloxyglopyldimethoxymethylsilane and 100 parts of hexafluorometa-xylene as the mixture of 7-mer and solvent, and 266 parts of hexafluorometa-xylene as the diluting solvent. The reaction was carried out in the same manner as in Production Example 1.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity of G.

The nonvolatile content was 49.2%.

Production example 3 2-perfluorooctylethyl methacrylate 350
parts, 140 parts of methyl methacrylate, 22,210 parts of vinyltrimethoxy and 80 parts of hexafluorometa-xylene.
The reaction was carried out in the same manner as in Production Example 1, except that the mixture of 70% and the solvent was used as a mixed solution of 7-mer and a solvent.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity R1 nonvolatile content of 49.5%.

Production example 4 2-perfluorooctylethyl methacrylate 100
parts, n-butyl methacrylate 250 parts, styrene 50 parts
parts, 100 parts of γ-methacryloyloxypropyltrimethoxysilane, 40 parts of hexafluorometaxylene, n
-40 parts of butyl alcohol and 7.5 parts of azobisbutylvaleronitrile, a polymerization initiator, were accurately weighed, mixed and dissolved, and the mixed solution was transferred to a 10-dropping funnel. Separately, water cooling pipe,
A 2Q four-bottle flask equipped with a thermometer and a stirrer was prepared, and 100 ml of hexafluorometa-xylene and 153 parts of butyl acetate were blended and maintained heated at 105 to 110°C. Next, the previously blended liquid mixture was dripped into the flask from the 1Q dropping funnel over a period of 2 hours. After finishing dropping 1
After a period of time, a mixture of part AIBNI and 170 parts of butyl acetate was added dropwise over 1 hour and 30 minutes, and then 115 to 1
The temperature was raised to 20°C and maintained for 2 hours. The mixture was then cooled to complete the reaction.

The obtained resin liquid was colorless and transparent, and had a Gardner viscosity R2 nonvolatile content of 50.5%.

Production Example 5 250 parts of 2-perfluorooctyl methacrylate, 2
-50 parts of ethylhexyl acrylate, 200 parts of γ-methacryloyloxypropyltrimethylsilane, 40 parts of hexafluorometaxylene, 4 parts of isobutyl alcohol
The reaction was carried out in the same manner as in Production Example 4, except that 0 part of the polymerization initiator and 5 parts of azobisisobutylvaleronitrile were stirred and mixed and dissolved, and this mixed solution was transferred to the IQ dropping funnel for use.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity of 48.5% non-volatile matter.

Production example 6 2-perfluorooctylethyl methacrylate 300
1 part, 2-perfluoropropylethyl methacrylate
The reaction was carried out in the same manner as in Production Example 1, except that a mixture of 50 parts of n-butyl alcohol, 50 parts of n-butyl alcohol, and 80 parts of hexafluorometa-xylene was used as the mixture of 7-mer and the solvent.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity of F.

The nonvolatile content was 48.5%.

Production Example 7 50 parts of 2-perfluorooctylethyl acrylate,
350 parts of n-butyl methacrylate, 80 parts of styrene,
Preparation Example 4 except that 20 parts of 2-hydroxyethyl methacrylate, 5 parts of polymerization initiator azobisisobutylvaleronitrile, and 80 parts of butyl acetate were accurately weighed, mixed and dissolved with stirring, and this mixed solution was transferred to the lα dropping funnel for use. The reaction was carried out in the same manner.

The obtained resin liquid was colorless and transparent, and had a Gardner viscosity S1 nonvolatile content of 48.8%.

Production example 8 2-perfluorooctylethyl methacrylate 15
0 parts, 2-perfluorooctylethyl acrylate 8
0 parts, 200 parts of methyl methacrylate, 70 parts of Silabrene FMO711 (Note 1), 40 parts of hexafluorometaxylene, and 40 parts of butyl acetate, stirred, mixed, and dissolved, and transferred this liquid mixture to a 1ffi dropping funnel. The reaction was carried out in the same manner as in Production Example 4, except that

The resulting resin liquid was pale yellow in color and had a Gardner viscosity N1 nonvolatile content of 50.1%.

(Note 1) Silabrene FMO711 manufactured by Chisso Corporation, vinyl group-containing reactive silicone, trade name, molecular weight approximately 1000, CH3CH.

(where n is about 11 on average) It has the structure of

Production Example 9 200 parts of 2-perfluorooctylethyl acrylate, 50 parts of 2-perfluoropropylethyl methacrylate
Department, Cyrabrain FMO711 (above, note 1) 150
80 parts of styrene, 20 parts of γ-methacryloyloxypropyltrimethoxysilane, 40 parts of hexafluorometaxylene, 20 parts of butyl acetate, and 20 parts of n-butyl alcohol were stirred and mixed, and this mixed solution was transferred to the lα dropping funnel. The reaction was carried out in the same manner as in Production Example 4 except for using the following.

The resulting resin liquid was pale yellow in color and had a Gardner viscosity G1 nonvolatile content of 48.0%.

Production Example 10 (for comparison) 20 parts of 2-perfluorooctylethyl methacrylate, 315 parts of n-butyl methacrylate, 65 parts of styrene, 100 parts of γ-methacryloyloxypropyltrimethoxysilane, 40 parts of hexafluorometa-xylene, n-
A reaction was carried out in the same manner as in Production Example 4, except that 40 parts of butyl alcohol and 7.5 parts of azobisisobutylvaleronitrile as a polymerization initiator were mixed and dissolved, and this mixed solution was transferred to an IF dropping funnel for use.

The obtained resin liquid was colorless and transparent, and had a Gardner viscosity R1 nonvolatile content of 49.7%.

Example l 200 parts of the fluoroalkyl group-containing copolymer resin liquid obtained in Production Example 1, 300 parts of 1,1.2-trichloro-1°1.2-)rifluoroethane, 600 parts of HFMX, 300 parts of butyl acetate, and 20 parts of hydrophobic silica A (Note 2) was blended and dispersed using a shaker to obtain a composition.

(Note 2) Hydrophobic silica: Hydrophobic silica fine powder with an average particle size of approximately 0.1 μm, trade name “Talnox-5” manufactured by Talco, USA.
00".

Examples 2 to 17 and Comparative Example 1.2 Compositions of Examples 2 to 17 and Comparative Examples 1 and 2 were obtained by processing in the same manner as in Example 1, except for using the formulations shown in Table 1 below.

Method for preparing test plates Examples 1 to 11 were prepared on aluminum plates treated with chromium phosphate.
And the compositions obtained in Comparative Examples 1 and 2 each had a dry coating weight of about 30. ? /m2, and then left to dry at room temperature for 24 hours to obtain a test plate.

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.

(*l) 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 “Tosval”.

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

(4) Carbon black: Fine carbon black powder with an average particle size of about 0.3 μm.

(*5) Untreated silica D: untreated silica fine powder with an average particle diameter of approximately 7 μm that has not been subjected to hydrophobization treatment, manufactured by Fuji Devison Co., Ltd., trade name: r Thyroid 308.

(*6) Contact angle with water: Drop 0.03 cc of deionized fishing rod using a syringe as a water drop onto the painted surface of a horizontal test plate, and measure the contact angle between the water drop and the painted surface after 1 minute of dropping. Measurement was performed using a contact Kungel meter manufactured by Interface Science.

(*7) 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 coated surface after 4 minutes of dropping. Measurements were made in the same manner except that .

(*8) Water droplet slipping property: 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 criteria ○: Falling at less than 20° ■ = Falling from 20° to less than 40° Δ: Falling from 40° to 606 Yoshi 1) Takeshi Moon1, Indication of the case Patent Application No. 157940 of 19882, Name of the invention Composition capable of forming a water-repellent film 3, Person making the amendment Relationship with the case Name of patent applicant (140) Kansai Paint Co., Ltd. 4, Agent 〒107 (1) On page 16, line 16 of the specification: ``It is possible.''

After that, add the following sentence.

"For example, when the composition of the present invention is applied to the fin material of a heat exchanger and dried, it is effective in preventing clogging due to adhesion of condensed water, frost, ice, etc. to the fin material, and reduces heat exchange efficiency. Furthermore, by applying the composition of the present invention to an insulator for high-voltage power transmission lines and drying it, it is possible to prevent short circuits of current during wind and flood damage, salt damage, etc.'' 5. There is no date for the amendment order 6, column 7 of "Detailed Description of the Invention" of the specification subject to amendment, and the content of the amendment is 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 1 to
5 to 100% by weight of a (meth)acrylic monomer containing a fluoroalkyl group, and n is an integer of 1 to 20, and the fluoroalkyl group-containing (meth)acrylic monomer (co)polymer consisting of 0 to 95% by weight of an unsaturated monomer that can be copolymerized with Water composition. 2. The composition according to claim 1, wherein the granules are fine silica particles having an average particle diameter of 3 μm or less. 3. Component (a) is 5 to 99.9% by weight of a fluoroalkyl group-containing (meth)acrylic monomer represented by the general formula (I), in combination with the fluoroalkyl group-containing (meth)acrylic monomer. Polymerizable general formula (II) ▲ mathematical formula, chemical formula,
There are tables, etc.▼(II) In the formula, R_2 represents a hydrogen atom or a methyl group, and R_3
represents a group represented by the following formula, where j is an integer of 0 or 1, k is an integer of 0 to 6, p is an integer of 1 to 5, and q is an integer of 1 to 20. , r is an integer from 0 to 2, s is an integer from 1 to 3, and r+s=3,
Silicon-containing polymerizable unsaturated monomer represented by 0.1 to 7
5% by weight, and 0 to 94.9% by weight of other unsaturated monomers copolymerizable with the fluoroalkyl group-containing (meth)acrylic monomer.
The composition according to claim 1 or 2, which is a copolymer consisting of. 4. The composition according to claim 1, 2 or 3, wherein the amount of component (b) is 20 to 600 parts by weight per 100 parts by weight of component (a).