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Thermosetting-resin-composition

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Thermosetting resin composition

Details

Inventors: Mizutani, Keita; Yoshimatsu, Saori; Yamakawa, Kinya;
Assignee: Nippon Paint Co., Ltd. (Osaka, JP)
Primary Examiner: Yoon; Tae
Assistant Examiner:
Attorney, Agent or Firm: Millen, White, Zelano & Branigan, P.C.

A thermosetting resin or coating composition contains (a) a film-forming polyol resin, (b) a curing agent reactive with the polyol resin, (c) a hydrolyzate/polycondensate of tri- or tetraalkoxysilane, and (d) a catalyst for promoting the reaction between the polyol resin (a) and the curing agent (b).

DETAILED DESCRIPTION We claim: 1.
A thermosetting resin composition comprising: (a) a film-forming polyol resin having a plurality of alcoholic hydroxyl groups corresponding to a hydroxyl number from 5 to 300 and a number average molecular weight from 500 to 20,000; (b) a curing agent reactive with said resin (a) selected from the group consisting of a blocked polyisocyanate and an aminoplast resin: (c) a hydrolyzate/polycondensate comprising reactive ultrafine silica particles having an inertial radius of 10 angstrom or less when determined by the small angle X-ray scattering method, produced by the hydrolysis and polycondensation reaction of tetramethoxysilane or an oligomer thereof in the presence of an amount of water greater than required to achieve 100% hydrolysis in theory; and (d) a catalyst for promoting the reaction between said resin (a) and said curing agent (b).
2.
The thermosetting resin composition according to claim 1 wherein said resin (a) is an acrylic polyol resin, a polyester polyol resin, a fluorine-containing polyol resin, or a silicone polyol resin.
3.
The thermosetting resin composition according to claim 1 wherein said curing agent is a blocked polyisocyanate.
4.
The thermosetting resin composition according to claim 1 wherein said catalyst (d) is a organotin compound, or a chelate of aluminum, titanium or zirconium.
5.
The thermosetting resin composition according to claim 1 wherein said curing agent is an aminoplast resin.
6.
The thermosetting resin composition according to claim 5 wherein said aminoplast resin is an alkyl etherified melamine resin.
7.
The thermosetting resin composition according to claim 5 wherein said catalyst is an organic sulfonic acid, an organic phosphonic acid, or an amine addition salt thereof.
8.
The thermosetting resin composition according to claim 1 wherein said hydrolyzate/polycondensate (c) is surface treated with a silane coupling agent.
9.
The thermosetting resin composition according to claim 8 wherein the molar ratio of said silane coupling agent to sum of silanol groups and alkoxysilyl groups present in said hydrolyzate/polycondensate (c) is from 0

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