JP2001329210A - Composition for treating sealing material and method for stainproofing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for treating a sealing material, which can effectively reveal excellent stainproofness over a long period of time without adversely affecting the quality of a material near the sealing material. SOLUTION: The composition is used for treating the surface of a sealing material and contains an aliphatic hydrocarbon solvent, an acrylate polymer (A) having perfluoroalkyl groups represented by CnF2n+1 (wherein n is an integer of 4 to 20) and soluble in the solvent, and an ethylenically unsaturated monomer copolymer (B) containing at least 60 wt.% 8C methacrylic ester and soluble in the solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composition for treating a sealing material and an antifouling treatment method, and more particularly to a composition for treating a sealing material for performing an antifouling treatment on a surface of a sealing material applied to a joint of a building. And a method of subjecting a surface of a sealing material to an antifouling treatment using the composition for treating a sealing material.

[0002]

2. Description of the Related Art Sealing materials applied to joints of the interior and exterior of buildings are materials used by filling joints and gaps between various building members for the purpose of imparting watertightness and airtightness. is there. BACKGROUND ART Conventionally, as a sealing material, there are materials made of various resins such as a silicone resin, a modified silicone resin, a polysulfide resin, and a polyurethane resin.
Among these, modified silicone-based, modified polysulfide-based or polyurethane-based resins are widely used, because they have excellent performance in terms of durability and weather resistance in a well-balanced manner.

[0003] However, since the sealing material made of these resins remains sticky (tacky) on the surface even after curing,
There is a problem that dust in the air adheres to the joints and impairs the appearance. Particularly in the Kanto region, there is a problem that the surface of the sealing material is significantly contaminated due to the influence of the Kanto loam layer. Therefore, a technique for imparting antifouling properties to the surface of the sealing material has been proposed for aesthetic reasons. For example, a method has been proposed in which after a sealing material is cured, a dust-preventing agent is applied to the surface thereof to provide a barrier layer. However, this method has a problem in that it is not possible to prevent the adhesion of dust until the sealing material is cured.

[0004] Conventional dust-preventing agents include acrylic,
The main component is a urethane-based or silicone-based resin.The hardness of the coating is too high to follow the joint movement or deteriorate by the action of light, causing cracks and dust. There is also a problem that is adhered. In order to prevent dust from adhering before the sealing material is cured, a method of applying a solvent-type antifouling agent containing a fluorine resin as a main component when the sealing material is not cured has been proposed. (See JP-A-2-182767 and JP-A-7-118572).

[0005]

Solvent-type antifouling materials described above include, as solvents, ester solvents such as ethylene acetate and butyl acetate, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone, and xylene and toluene. Aromatic hydrocarbon solvents have been used. However, since these solvents have high solubility in organic materials, there are problems such as discoloration, shrinkage, and gloss change of the organic materials around the sealing material. In addition, chlorinated fluorinated hydrocarbons and chlorinated hydrocarbons, which easily dissolve the fluororesin, have been used in recent years because of environmental considerations, and other solvents have to be selected.

[0006] In a solvent type antifouling agent containing a fluororesin as a main component, the solubility of the fluororesin becomes low in consideration of the solubility in a solvent. Also, if you increase the coating amount,
This may change the appearance or cause cracks. As a result, there is a problem that the thickness of the coating film on the sealing material is limited, and the long-term antifouling durability is lacking. An object of the present invention is to provide a composition for treating a sealing material capable of effectively exhibiting excellent antifouling properties over a long period of time without adversely affecting materials near the sealing material.

[0007]

Sealant treatment composition of the present invention SUMMARY OF THE INVENTION can be a composition for treating a sealant surface, and aliphatic hydrocarbon solvents, soluble in said solvent, C _n An acrylate polymer (A) containing a perfluoroalkyl group represented by F _{2n + 1} (n is an integer of 4 to 20) and a methacrylic acid ester having 8 carbon atoms, which is soluble in the solvent, is at least 60% by weight or more. And an ethylenically unsaturated monomer copolymer (B).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Aliphatic hydrocarbon solvent] As the aliphatic hydrocarbon solvent, a known solvent containing an aliphatic hydrocarbon as a main component can be used. As used herein, the term "aliphatic hydrocarbon" refers to a narrowly defined aliphatic hydrocarbon consisting of only carbon atoms and hydrogen atoms. As the aliphatic hydrocarbon-based solvent, a solvent containing 80% by weight or more of an aliphatic hydrocarbon is preferable. It is preferable that the aliphatic hydrocarbon-based solvent does not substantially contain a solvent other than the aliphatic hydrocarbon-based solvent, and particularly does not contain an oxygen-containing solvent such as an aromatic hydrocarbon, an acetate, and a ketone. However, a small amount may be contained as long as the effect on the organic coating can be ignored.

As the aliphatic hydrocarbon-based solvent, a solvent classified under industrial gasoline JIS Nos. 4 and 5 is preferable. Further, a paraffinic solvent containing a paraffinic hydrocarbon or an isoparaffinic hydrocarbon as a main component is preferable. The paraffin solvent is a mixture containing two or more paraffin hydrocarbons or isoparaffin hydrocarbons. It is preferable to include a plurality of paraffinic hydrocarbons having 5 or more carbon atoms or isoparaffinic hydrocarbon compounds. Particularly, a paraffinic hydrocarbon having 7 to 12 carbon atoms or an isoparaffinic hydrocarbon having 7 to 12 carbon atoms is 80%.
It is preferable that the content is not less than% by weight. For example, as a paraffin-based solvent, isopentane, n-pentane, n-
Those containing hexane, n-heptane, n-octane and the like are preferred. Further, the boiling point of the aliphatic hydrocarbon solvent is 60
Preferably it is ~ 300 ° C. Further, the aliphatic hydrocarbon-based solvent may be an alicyclic hydrocarbon such as methylcyclohexane.

Some of the above-mentioned aliphatic hydrocarbon solvents are commercially available, and in the present invention, the commercially available products can be used as they are. Commercially available products include the following. A Solvent, K Solvent, Mineral Spirit, Dry Solvent, New Solve DX, LA
Solvent (trade name, manufactured by Nippon Oil Co., Ltd.), Vegazol AN45, Vegazol 3040 (trade name, manufactured by Mobil Corporation), Essonafusa No. 6, Essonafusa No. 5
(The above are trade names manufactured by Esso Chemical Co., Ltd.), Laws, Shell Eight, Bright Sol, Shell Sol 140 (the above trade names manufactured by Shell Chemical Co., Ltd.), Shoseki Solvent, Shoseki SS Drysol, Shoseki Naphsol No.1 (the above, Showa Sekiyu Co., Ltd., Kyoishi Tokusorbent, Kyoishi White Sol, LA Solvent (Kyoto Sekiyu Co., Ltd.), Mineral Tarpen, Diamond Solvent (Mitsubishi Sekiyu Co., Ltd.), Solvent Kerosene LA , Solvent Kerosene (trade name, manufactured by General Petroleum Co., Ltd.), Dyna Solvent (trade name, manufactured by Daikyo Sekiyu KK), Idemitsu Solvent (trade name, manufactured by Idemitsu Kosan Co., Ltd.)

[Acrylate polymer (A)] The acrylate polymer (A) containing a perfluoroalkyl group represented by C _n F _{2n + 1} (n is an integer of 4 to 20) in the present invention.
Can be considered as follows. Hereinafter, a perfluoroalkyl group represented by C _n F _{2n + 1} (n is an integer of 4 to 20) is referred to as an Rf group. The Rf group is
It means a group in which all hydrogen atoms of an alkyl group have been replaced by fluorine atoms. The number of carbon atoms of the Rf group is more preferably from 4 to 16, and particularly preferably from 6 to 12. The structure of the perfluoroalkyl group is preferably a linear or branched structure, and particularly preferably a linear structure. The perfluoroalkyl group having a linear structure is preferably a group represented by C _n F _{2n + 1} (where n is an integer of 4 to 20), and particularly preferably a group having n of 6 to 12.

The following are specific examples of the Rf group. In addition, in the following specific examples, groups corresponding to respective structurally isomer groups are also included. C ₄ F ₉ - _{[e.g., CF 3 (CF 2) 3} -, (C
F _{3) 2} CFCF _{2 one, (CF 3) 3 C-,} CF 3 CF
₂ CF (CF ₃₎ - and the like structural isomers. ]. C ₅ F ₁₁ - _{[e.g., CF 3 (CF 2) 4} -, (C
_{F 3) 2 CF (CF 2} ) 2 -, (CF 3) 3 CCF
_2- , CF ₃ (CF ₂ ) ₂ CF (CF ₃ ) — and other structural isomers. ]. _{C 6 F 13 - [CF 3} (CF 2) 2 C (CF 3) 2 Chief structural isomers. ].

C ₈ F ₁₇ −, C ₁₀ F ₂₁ −, C ₁₂ F ₂₅ −, C
_{14 F 29 -, C 16 F} 31 -, C 18 F 37 -, (CF 3) 2 CF
CsF ₂ s-(here, s is an integer from 1 to 15.)
etc. The following compounds are preferred as the acrylate containing an Rf group. CH ₂ ＣＨCHCOOCH ₂ CH ₂ Rf CH ₂ ＣＨCHCOOCH ₂ CH ₂ N (C ₃ H ₇ ) COR
f CH ₂ ＣＨCHCOOCH (CH ₃ ) CH ₂ R f CH ₂ ＣＨCHCOOCH ₂ CH ₂ N (CH ₃ ) SO ₂ R
f CH ₂ ＣＨCHCOOCH ₂ CH ₂ N (CH ₃ ) CORf CH ₂ ＣＨCHCOOCH ₂ CH ₂ N (C ₂ H ₅ ) SO _{2
Rf CH 2 = CHCOOCH 2 CH 2} N (C 2 H 5) COR
f CH ₂ ＣＨCHCOOCH ₂ CH ₂ N (C ₃ H ₇ ) SO ₂
Rf CH ₂ ＣＨCHCOOCH (CH ₂ Cl) CH ₂ OCH ₂
In a polymer containing polymerized units of an acrylate containing a CH ₂ N (CH ₃ ) SO ₂ Rf Rf group, polymerized units of an acrylate containing an Rf group include:
One or more kinds may be contained. In the case where two or more kinds are included, two or more kinds of R
It is preferable to use a (meth) acrylate containing an f group in combination.

The polymer containing polymerized units of an acrylate containing an Rf group may contain polymerized units of a monomer having a radical polymerizable unsaturated bond other than the polymerized acrylate unit containing an Rf group. In the following, the monomer having the radical polymerizable unsaturated bond is referred to as “other monomer”. In addition, acrylate and methacrylate are collectively referred to as “(meth) acrylate”. Other monomers include the following from the viewpoint of solubility in the above-mentioned aliphatic hydrocarbon solvents. For example, ethylene, vinyl acetate, vinyl fluoride, halogenated vinyl styrene, α-methyl styrene, p-methyl styrene, (meth) acrylic acid and its alkyl ester, poly (oxyalkylene) (meth) acrylate, (meth) acrylamide , Diacetone (meth) acrylamide, methylolated (meth) acrylamide, N-methylol (meth)
Acrylamide, vinyl alkyl ether, vinyl alkyl ketone, butadiene, isoprene, chloroprene,
Glycidyl (meth) acrylate, aziridinyl (meth) acrylate, benzyl (meth) acrylate, inocyanatoethyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, maleic anhydride, triaryl isocyanurate, (Meth) acrylate having polysiloxane, N-vinylcarbazole and the like. Among these, it is preferable that cyclohexyl (meth) acrylate is essential as the other monomer, and it is particularly preferable that cyclohexyl methacrylate is essential.

The amount of fluorine in the polymer is preferably 20 to 30% by weight. If the amount of fluorine is too small, the amount of the processing agent used for obtaining the effect increases, and the influence on the appearance and the risk of cracks increase. On the other hand, when the amount of fluorine is too large, the solubility of the resin in the solvent is reduced, and an insoluble portion may be generated. The molecular weight of the polymer is 10,000 weight-average molecular weight.
0 to 200,000 is preferable, and especially 30,000 to 1
00,000 is preferred. If the molecular weight is too small, the antifouling property against dust is not sufficient, and if the molecular weight is too large, the solubility in a solvent is reduced and the viscosity is increased, and neither is preferable.

As a method for obtaining a polymer containing polymerized units of an acrylate containing an Rf group, an acrylate containing an Rf group and, if necessary, other monomers are dissolved in an aliphatic hydrocarbon solvent and heated. A method of polymerizing under stirring is preferred. The polymerization is preferably carried out by causing a polymerization initiation source to act.Examples of the polymerization initiation source include organic acid peroxides, azo compounds, polymerization initiators such as persulfates, ionizing radiation such as γ-rays, and the like. Can be adopted. [Ethylenically unsaturated monomer copolymer (B)] having 8 carbon atoms
At least 60% by weight of a methacrylate ester
The ethylenically unsaturated monomer copolymer (B) contained above is considered as follows.

Examples of the methacrylate having 8 carbon atoms include n-butyl methacrylate, isobutyl methacrylate, and t-butyl methacrylate. The ethylenically unsaturated monomer copolymer (B) may contain a polymerized unit of a monomer having a radical polymerizable unsaturated bond other than the above as long as the physical properties are not impaired. In addition,
Hereinafter, the monomer having the radical polymerizable unsaturated bond is referred to as “another monomer”. In addition, acrylate and methacrylate are collectively referred to as “(meth) acrylate”. Other monomers include the following from the viewpoint of solubility in the above-mentioned aliphatic hydrocarbon-based solvent.
For example, ethylene, vinyl acetate, vinyl fluoride, halogenated vinyl styrene, α-methyl styrene, p-methyl styrene, (meth) acrylic acid and its alkyl ester, poly (oxyalkylene) (meth) acrylate,
(Meth) acrylamide, diacetone (meth) acrylamide, methylolated (meth) acrylamide, N-methylol (meth) acrylamide, vinyl alkyl ether, vinyl alkyl ketone, butadiene, isoprene, chloroprene, glycidyl (meth) acrylate,
Aziridinyl (meth) acrylate, benzyl (meth)
Acrylate, isocyanatoethyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, maleic anhydride, triaryl isocyanurate, (meth) acrylate having polysiloxane, N-vinylcarbazole, and the like. Among these, it is preferable that cyclohexyl (meth) acrylate is essential as the other monomer, and it is particularly preferable that cyclohexyl methacrylate is essential.

[Sealant Treatment Composition] The sealant treatment composition of the present invention comprises the above-mentioned aliphatic hydrocarbon-based solvent and C _n F _{2n + 1} (n is 4 to 20) soluble in the solvent. Acrylate polymer (A) containing a perfluoroalkyl group represented by the following formula: and an ethylenically unsaturated monomer copolymer containing at least 60% by weight or more of a methacrylic acid ester having 8 carbon atoms soluble in the solvent ( B). The amount of the acrylate polymer (A) in the sealing material-treating composition is not particularly limited. However, if the concentration is too low, the effect may be reduced, and if the concentration is too high, it is uneconomical. Therefore, the acrylate polymer (A) is preferably contained in an amount of 0.1 to 20 parts by weight, particularly preferably 0.3 to 10 parts by weight, based on 100 parts by weight of the composition.

The amount of the ethylenically unsaturated monomer copolymer (B) is not particularly limited, but if the concentration is too low, the thickness of the coating film on the sealing material decreases, and the durability of the antifouling property is reduced. There is a risk of lowering. If the concentration is too high, the effect of the acrylate polymer (A) is reduced,
Has an adverse effect on antifouling properties. For this reason, it is preferable that the ethylenically unsaturated monomer copolymer (B) is contained in an amount of 0.1 to 60 parts by weight, particularly 0.1 to 30 parts by weight, based on 100 parts by weight of the composition. It is preferable to include a part. The composition for treating a sealing material may be composed of only the aliphatic hydrocarbon-based solvent, the acrylate polymer (A) and the ethylenically unsaturated monomer copolymer (B). It may contain additives.
Other additives include fragrances, defoamers, fungicides and the like. When other additives are contained, it is preferably contained in an amount of 0.01 to 1 part by weight, particularly preferably 0.05 to 0.5% by weight, based on 100 parts by weight of the composition. .

[Sealant] The composition for treating a sealant is applied to the surface of the sealant, and by forming a film on the surface of the sealant, adhesion of dirt can be prevented. As the sealing material, a modified silicone-based, modified polysulfide-based or polyurethane-based resin is preferable, and a modified silicone-based resin is particularly preferable. As the sealing material, a POS seal,
POS seal type II, POS seal LM, etc. (these are brand names manufactured by Cemedine), penguin seal 2500DR
Y, a sealing material made of denatured silicone resin such as penguin seal 2570 (above, a trade name of Sunstar Giken Co., Ltd.), S-750 (above, a trade name of Cemedine Co., Ltd.),
Penguin seal 980, penguin seal 999 (or more,
Sunstar Giken Co., Ltd.), Hamatite UH-30,
Hamatite Seal Ace (trade name of Yokohama Rubber Co., Ltd.)
And a sealing material made of a polyurethane-based resin.

[Use of the composition for treating a sealing material] The method of applying the composition for treating a sealing material to the surface of the sealing material is not particularly limited. The following method can be adopted as a general construction procedure. A masking tape is applied around the joint, and the joint is filled with a sealing material and finished with a gold spatula or the like. Thereafter, the composition for treating a sealing material is applied to the surface of the sealing material by a method such as spraying. After application, the masking tape is peeled off. The application of the composition for treating a sealing material can be performed either when the sealing material has not been cured (immediately after the sealing material is cast) or after curing (after the next day). If the coating is applied immediately after the sealing material is cast, the masking tape can be removed on the same day of the work, resulting in high work efficiency.

The coating of the fluoropolymer is formed on the surface of the sealing material by drying after the application of the composition for treating the sealing material. Drying may be air drying. In particular, even when used in a factory where there is a lot of dust, since a film having antifouling properties is formed, it is possible to satisfactorily prevent dust from adhering to the surface of the sealing material. The fluoropolymer film is preferably formed on the surface of the sealing material to a thickness of 0.1 to 10 μm. In particular, it is preferable to form the film with a thickness of 0.5 to 5 μm. If the film thickness is too thin, a sufficient effect of maintaining the antifouling property cannot be obtained, and if it is too thick, it causes cracks and is uneconomical.

The application location of the sealant treated with the composition of the present invention is not particularly limited. For example, there are a sealing material present at a joint or a gap between various building members, a sealing material used for transportation equipment, a sealing material used for electric equipment, a sealing material used for furniture and kitchenware, and the like. Among them, it is preferable to apply the present invention to a sealing material existing at a joint or a gap between various building members.

[0024]

EXAMPLES Example 1 Preparation Example of Acrylate Polymer (A) In a 1-liter autoclave equipped with a stirrer, 200 parts by weight of mineral spirit (trade name, manufactured by Nippon Oil Co., Ltd.) and perfluoroalkylethyl acrylate (the compound The perfluoroalkyl group has 6, 8, 10, 12, 1 carbon atoms.
A mixture of 4 with an average of 9. Hereinafter, it is described as FA. ) 45 parts by weight, cyclohexyl methacrylate 51
Parts by weight, 4 parts by weight of triallyl isocyanurate and 1 part by weight of azobisisobutyronitrile were added. While replacing the air inside with nitrogen gas and stirring at 300 rpm, 6
The temperature was raised to 0 ° C. and maintained for 20 hours to obtain a pale yellow liquid. The conversion of the monomer by gas chromatography was 99% or more. The resulting pale yellow liquid was diluted with Newsol (trade name, manufactured by Nippon Oil Co., Ltd.) so that the solid content concentration became 5% by weight, to obtain Composition 1.

Example 2 Preparation Example of Ethylenically Unsaturated Monomer Copolymer (B) Mineral spirit (manufactured by Nippon Oil Co., Ltd.) 80 parts by weight (trade name), 35 parts by weight of n-butyl methacrylate, and 15 parts by weight of cyclohexyl methacrylate were charged and heated to 120 ° C. N-methacrylic acid
35 parts by weight of butyl, cyclohexyl methacrylate 15
A mixture consisting of 10 parts by weight of mineral spirit, 10 parts by weight of mineral spirit and 1 part by weight of azobisisobutyronitrile was added dropwise over 3 hours. In addition, mineral spirit 10
Parts, a mixture of 0.2 parts of azobisisobutyronitrile,
It was added dropwise over one hour. After the completion of the dropwise addition, the reaction was carried out at the same temperature for 3 hours.
A pale yellow transparent resin solution at 25 ° C. as was obtained. The obtained resin solution was diluted with Newsol (trade name, manufactured by Nippon Oil Co., Ltd.) so that the solid content concentration became 5% by weight, to obtain Composition 2.

[Example 3] Preparation example of a composition for treating a sealing material A mixture of Examples 1 and 2: 100 g each of Composition 1 and Composition 2
The mixture was mixed to obtain composition 3. [Evaluation Examples 1 to 4] The compositions 1 to 3 prepared above were evaluated by the following evaluation methods, respectively. Table 1 shows the results. [Method of evaluating surface condition] A joint having a width of 10 mm was formed with a slate having a thickness of 6 mm, and a masking tape was applied along the joint. A one-component silicone-based sealing material (PanaHome Sealant (trade name, manufactured by Sunstar Giken)) was filled between the joints, and the surface of the sealing material was pressed with a spatula to be flat. Immediately thereafter, the sealing material treatment composition is sprayed with a sprayer,
The composition was spray-coated so that the coating formed had a thickness in the range of 0.5 to 5 μm. Immediately after the masking tape was peeled off, what was cured for 7 days at 23 ° C. and 50% RH was used as a test joint, and a stain resistance test was performed.

Here, the contamination resistance test means that the test joint is 7
After standing at O ° C for 24 hours, it is left to cool at room temperature for 30 minutes. Then, sprinkle with volcanic ash (200 mesh), wash off excess volcanic ash with 1 liter of water (do not scrub), and dry at room temperature for 2 hours. This is defined as one cycle, and 10 cycles are performed. After the test joint was exposed for 1000 hours with a sunshine weatherometer (S-WOM), a similar stain resistance test was performed. <Sunshine weatherometer (S-WOM)> Light source: Sunshine carbon arc lamp Irradiation condition: Continuous irradiation Glass filter: Available P temperature: 63 ± 3 ° C Watering time: 18 minutes during 120 irradiation Watering direction / water temperature: surface side / normal temperature water After the stain resistance test, the state of dirt on the test joint surface was visually observed, and the following A to D Evaluation was based on criteria.

Further, the presence or absence of cracks at the test joint was also observed. <Evaluation Criteria> A: No adhesion of dirt is observed. B: Some adhesion of dirt is observed. C: The surface is slightly darkened. D: The surface is black. +: Cracked, ±: Slightly cracked,-: No cracked. <Test result> (S-WOM test) ────────────────────────────── Evaluation example Treatment composition Initial 1000 hours passed Rear Appearance Stain resistance Appearance Stain resistance ──────────────────────────────1 Composition 1-A ± C2 Composition 2 ± C + D3 composition 3-A-A4 None -D + D────────────────────────────── As a result of the above test, Composition 3 which is a specific example of the present invention
The initial and sunshine weatherometer test 100
At any stage after the elapse of 0 hours, the appearance was good and the stain resistance was also good. With only the solvent and the acrylate polymer (A) (composition 1) or only the solvent and the ethylenically unsaturated monomer copolymer (B) (composition 2), even if good performance can be exhibited at the initial stage, 1000 hours After the lapse of time, both the appearance and the stain resistance were poor.

[0029]

The composition for treating a sealing material of the present invention comprises:
An antifouling property having excellent durability can be imparted to the surface of the sealing material. Further, even if a coating film made of an organic coating exists near the sealing material, it can be used without fear of adversely affecting the coating film. Further, the coating formed by the composition for treating a sealing material of the present invention has the advantages that cracks can be prevented and there is little change in appearance.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuyuki Sugimoto 1-4-1 Shinsenri Nishimachi, Toyonaka City, Osaka Inside National Housing Industry Co., Ltd. (72) Inventor Yukio Kawamata 1-chome Shinsenri Nishimachi, Toyonaka City, Osaka Prefecture No. 1-4 Inside the National Housing Industry Co., Ltd. (72) Inventor Tetsuo Yasuda 1-4-1 Shinsenri Nishimachi, Toyonaka City, Osaka Prefecture Inside the National Housing Industry Co., Ltd. (72) Inventor Shoichi Kawakami 2-chome Hatchobori, Chuo-ku, Tokyo No. 23-1, Asahi Glass Coat and Resin Co., Ltd. (72) Inventor Yoko Ikemoto 2-23-1, Hatchobori 2-chome, Chuo-ku, Tokyo F-term in Asahi Glass Coat and Resin Co., Ltd. 4H017 AA31 AE03 4J038 CG141 CG142 CH191 CH251 CJ012 CJ032 CJ062 CJ102 CJ142 CJ202 JA02 KA06 MA09 NA05 PA18 PB05 PB12

Claims (2)

[Claims] 1. A composition for treating a surface of a sealing material, comprising: an aliphatic hydrocarbon-based solvent; soluble in said solvent; and represented by C _n F _{2n + 1} (n is an integer of 4 to 20). Acrylate polymer (A) containing a perfluoroalkyl group to be obtained, and an ethylenically unsaturated monomer copolymer (B) soluble in the solvent and containing at least 60% by weight or more of a methacrylic acid ester having 8 carbon atoms. A composition for treating a sealing material. 2. An antifouling treatment method comprising applying the composition for treating a sealing material according to claim 1 to a surface of a sealing material applied to a building to form a coating.