Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1997-08-18
2000-06-13
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
10628716, 523400, 525100, 525102, 528 17, 528 18, 528 21, 528 23, 528 28, 528 29, 556483, C08G 7708
Patent
active
06075110&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a stain-proofing agent for preventing adherence of stains and a non-aqueous composition for paints containing the stain-proofing agent, and particularly relates to the non-aqueous composition suitable for paints for building materials, civil engineering, heavy duty coating, automobiles, etc.
BACKGROUND ART
In recent years, a solvent-soluble fluoroolefin copolymer containing hydroxyl group or carboxyl group has been used as an ultra-high weather resistive coating resin, and the use thereof has been increasing. It is known that copolymers of fluoroolefin with vinyl ether, vinyl ester or the like, which is proposed in, for example, JP-B-60-21686, JP-A-3-121107, JP-A-4-279612 and JP-A-4-28707, are soluble in usual solvent for paints, and in combination use with a curing agent such as isocyanate or melamine, can be baked or cured at normal temperature to form coating films excellent in weather resistance.
However, those coating films have a problem that, when the films are exposed outdoors, staining substances contained in air and in rain water are easily deposited on and adhere easily to a surface of the coating film (problem in stain-proofing property for preventing adherence of stains). In order to improve wipe-off property of carbon stains and marking ink (stain removal property), reaction products of fluoroolefin copolymer and silane compound were investigated in, for example, JP-A-4-173881. Also in U.S. Pat. No. 3,429,845 and JP-A-4-275379, there are proposed compositions of hydroxyl group-containing fluoroolefin copolymers and compounds (hydrolysis product) prepared by adding water and a catalyst (hydrochloric acid, etc.) to a silicate (monomer) or a silicate condensate (oligomer) and then hydrolyzing the mixture in alcohol. However, those compositions cannot offer the effect of improving the above-mentioned stain-proofing property.
Examples of employing a silane compound as a curing moiety as mentioned above are also proposed in JP-B-45-11309, JP-A-5-78612, JP-A-61-258852, JP-A-62-116673, JP-A-64-75575, JP-A-2-232221, JP-A-2-240153, JP-A-4-211482, JP-A-4-65476 and JP-A-4-292677. However, curing is insufficient due to large contents of alcohol and water. On the other hand, since a silicate originally has hydroxyl group or requires high temperature baking, migration of the silicate to the surface of coating film is inhibited. Also there is a problem that since the silane compound has a non-hydrolyzable group, hydrophilic property is insufficient. Due to the mentioned reasons, the stain-proofing property is not improved like the above-mentioned other proposals.
The situation is the same with respect to other paints of acryl, acrylic silicon, inorganic materials or the like, and a coating film having remarkably improved stain-proofing property is scarcely known.
Further as disclosed in WO94/06870, WO95/02645, JP-A-7-109435, JP-A-7-82520, JP-A-7-136583 and JP-A-7-136584, very recently techniques for improving stain-proofing property by adding an alkyl silicate to paints have come to be known, but the resulting coating films have disadvantages that hydrophilization of the coating film surface (stain-proofing property) cannot be repeatedly obtained, and that appearance and alkali resistance of the coating film are poor.
The present situation is such that though silane compounds are used as a dehydrating agent at the time of polymerizing or dispersing pigments, almost the whole amount of the silane compound reacts with water during the production process and thus, the effect of improving the stain-proofing property of the resulting coating film is scarcely obtained.
An object of the present invention is to provide a non-aqueous composition for paints being capable of forming a coating film which is remarkably excellent in stain-proofing property whereby neither staining substances contained in air nor stains due to rain water adhere to or are deposited on the coating film surface, and to provide a stain-proofing agent for adding to the composition.
DISCLOSU
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Chida Akira
Kunimasa Keiko
Mohri Haruhiko
Nagato Masaru
Shimizu Yoshiki
Daikin Industries Ltd.
Dawson Robert
Robertson Jeffrey B.
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