Water-based paint compositions

Details Water-based paint compositions Water-based paint compositions

2007-04-05

2010-11-30

Sastri, Satya B (Department: 1796)

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...

C524S504000, C523S201000

Reexamination Certificate

active

07842751

ABSTRACT:
This invention provides a water-based paint composition comprising an emulsion resin (A), melamine resin (B) and hydrophobic solvent (C), the emulsion resin (A) being fine resin particles having core/shell type multilayered structure composed of the core made of a copolymer (I) obtained by copolymerization of 0.1-30 mass % of polymerizable unsaturated monomer (a) having at least two polymerizable unsaturated groups per molecule and 70-99.9 mass % of other polymerizable unsaturated monomer (b), and the shell made of a copolymer (II) obtained by copolymerization of 5-50 mass % of vinyl aromatic compound (c) and 50-95 mass % of other polymerizable unsaturated monomer (d), the solid mass ratio of the copolymer (I)/copolymer (II) being within a range of 10/90-90/10; the melamine resin (B) having a weight-average molecular weight within a range of 1,000-5,000; and containing, per 100 mass parts of solid resin content in the water-based paint composition, the emulsion resin (A) within a range of 10-80 mass parts, the melamine resin (B), within a range of 5-50 mass parts, and the hydrophobic solvent (C), within a range of 10-100 mass parts. Use of the water-based paint composition allows formation of coating film free of metallic mottling and excelling in flip-flop property, smoothness, luster and water resistance.

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JP 2002308993 A, Oct. 2002, Yoshio et al., Machine translation.
International Search Report mailed Jun. 5, 2007 in the International (PCT) Application of which the present application is the U.S. National Stage.
International Preliminary Report on Patentability issued on Nov. 17, 2008 in the International (PCT) Application of which the present application is the U.S. National Stage.

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