Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-03-13
1996-07-02
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08K 554
Patent
active
055323049
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition for coating and an outdoor article coated therewith.
BACKGROUND ART
Heretofore, it has been common to apply surface coating such as coating to articles such as metals, inorganic materials, plastics, wood materials, papers, leathers or fibers for the purposes of their protection, imparting an artistic effect and a functional property, etc., and various coating materials have been developed.
Recently, as a coating material excellent in weather resistance, a fluoropolymer coating material is used in many cases. Such a fluoropolymer coating material shows a remarkably high weather resistance as compared with prior synthetic resin coating materials which have been used extensively. However, the antifouling property against soils deposited on its surface is of the same level as in the case of other synthetic resin coating materials, and an improvement in this respect is desired so that it can be used as a high performance commercial product.
Heretofore, to solve formation of the soils on the surface of a coated article, a composition for coating has been proposed wherein a polymer having a polyfluorinated carbon chain and a hydrophilic group, is incorporated (Japanese Unexamined Patent Publication No. 198653/1989). However, the proposed composition for coating was not adequate with respect to prevention of formation of streak-like soils (hereinafter referred to as rain streak soils) which are likely to form at a portion where rain water collects and runs down, such as below a window frame of a building, although some effects for preventing formation of spot-like soils due to rain water are observed.
DISCLOSURE OF INVENTION
The present invention has been made to solve the problems described above and provides a resin composition for coating, comprising a functional group-containing fluoropolymer (a), a curing agent (b) capable of crosslinking the functional group-containing fluoropolymer (a), and an oligomer (c) of a tetrafunctional hydrolyzable silane compound.
By applying the composition of the present invention to the portion of an outdoor article, where rain streak soils are particularly likely to form, formation of rain streak soils can be prevented excellently for a long period of time.
As the functional group-containing fluoropolymer (a) (hereinafter referred to simply as the fluoropolymer (a)), various resins may be used without any particular restriction, and the fluoropolymer (a) known as a fluoropolymer for coating obtained by copolymerizing a fluoroolefin with another copolymerizable monomer, is preferred from the viewpoint of the solubility in a solvent, the weather resistance of the coating film, the operation efficiency for coating, etc.
As the fluoroolefin, a fluoroolefin having 2 or 3 carbon atoms, such as tetrafluoroethylene, chlorotrifluoroethylene, trifluoroethylene, vinylidene fluoride, hexafluoropropylene or pentafluoropropylene, may be mentioned.
As the monomer copolymerizable with the fluoroolefin, at least one monomer selected from a vinyl ether, a vinyl ester, an allyl ether, an allyl ester, an isopropenyl ether, an isopropenyl ester, a methallyl ether, a methallyl ester, an .alpha.-olefin, an acrylic acid ester, a methacrylic acid ester, etc., may be mentioned.
Here, as an example of the vinyl ether, an alkyl vinyl ether such as ethyl vinyl ether, butyl vinyl ether, cyclohexyl vinyl ether, a fluoroalkyl vinyl ether or a perfluoro(alkyl vinyl ether) may be mentioned. As an example of the vinyl ester, a fatty acid vinyl ester such as "Veova 10" (tradename, manufactured by Shell Chemical Co.,) having a branched alkyl group, vinyl butyrate, vinyl acetate, vinyl pivalate or versatic acid vinyl ester may be mentioned.
As an example of the allyl ether, an alkyl allyl ether such as ethyl allyl ether or cyclohexyl allyl ether may be mentioned. As an example of the allyl ester, a fatty acid allyl ester such as allyl propionate or allyl acetate may be mentioned. As an example of the isopropenyl ether, an alkyl isopropenyl
REFERENCES:
patent: 2645624 (1953-07-01), Hunter
patent: 3575916 (1971-04-01), Bockstie
patent: 3644260 (1972-02-01), Strolle
patent: 4751114 (1988-06-01), Homma et al.
Kodama Shun-ichi
Miyazaki Nobuyuki
Takayanagi Takashi
Uchino Bunji
Asahi Glass Company Ltd.
Morgan Kriellion S.
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