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US 8,575,259 B2Granted
Water-based paint compositions
AssigneeKansai Paint Co., Ltd.
InventorsYasuhiro Tomizaki, Takuya Kawachi, Takahisa Ooya
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Abstract
The invention provides water-based paint compositions capable of forming coating film of excellent smoothness, distinctness of image, water resistance and chipping resistance, which comprise aqueous film-forming resin, curing agent and crosslinked resin particles having a core/shell type multilayer structure composed of the core part of a (co)polymer obtained by (co)polymerizing a monomer component comprising 30-100 mass % of polymerizable unsaturated monomer having C4-22 alkyl group and 0-70 mass % of other polymerizable unsaturated monomer, and the shell part having a crosslinked structure.
Claims12
A water-based paint composition, comprising
- (A) an aqueous film-forming resin,
- (B) a curing agent, and
- (C) crosslinked resin particles (C1) or crosslinked resin particles (C2),
- wherein the crosslinked resin particles (C1) have a core/shell multilayer structure composed of a core part of a (co)polymer (I) having a glass transition temperature (Tg1) within a range of from −65° C. to -20° C. and obtained by (co)polymerizing a monomer component comprising 30-100 mass % of a polymerizable unsaturated monomer (c-1) having a C6-18 alkyl group and 0-70 mass % of another polymerizable unsaturated monomer (c-2), and a shell part having a crosslinked structure of a copolymer (II) having a glass transition temperature (Tg1) within a range of from −50° C. to 110° C. and obtained by copolymerizing a monomer component consisting of 0.1-40 mass % of a polymerizable unsaturated monomer (c-3) having at least two polymerizable unsaturated groups per molecule and 60-99.9 mass % of a polymerizable unsaturated monomer (c-4) having one polymerizable unsaturated group per molecule,
- wherein the polymerizable unsaturated monomer (c-4) contains 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-3) and (c-4), and
- wherein the crosslinked resin particles (C2) have a core/shell multilayer structure formed of the core part of the (co)polymer (I), and a shell part having a crosslinked structure of a (co)polymer (III) having a glass transition temperature (Tg1) within a range of −50° C. to 110° C. and obtained by (co)polymerizing a monomer component consisting of 0.1-60 mass % of a functional group-containing polymerizable unsaturated monomer (c-5), 0-60 mass % of a polymerizable unsaturated monomer (c-6) having a functional group complementally reactable with the functional group in the polymerizable unsaturated monomer (c-5), 0-99.9 mass % of another polymerizable unsaturated monomer (c-7), and 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-5), (c-6), and (c-7).
3 more elements
A water-based paint composition, which comprises:
- (A) an aqueous film-forming resin,
- (B) a curing agent, and
- (C) crosslinked resin particles (C) are:
- (i) crosslinked resin particles having a core/shell multilayer structure composed of a core part comprising a (co)polymer (I) having a glass transition temperature (Tg1) within a range of from −65° C. to −20° C. and a shell part comprising a copolymer (II) having a glass transition temperature (Tg1) within a range of from −50° C. to 110° C., wherein the (co)polymer (I) and copolymer (II) are obtained by emulsion polymerizing a monomer mixture containing 30-100 mass % of a polymerizable unsaturated monomer (c-1) having a C6-18 alkyl group and 0-70 mass % of another polymerizable unsaturated monomer (c-2) to obtain an emulsion, adding to the obtained emulsion containing the (co)polymer (I) a monomer mixture of 0.1-40 mass % of a polymerizable unsaturated monomer (c-3) having at least two polymerizable unsaturated groups per molecule and 60-99.9 mass % of a polymerizable unsaturated monomer (c-4) having one polymerizable unsaturated group per molecule, wherein the polymerizable unsaturated monomer (c-4) contains 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-3) and (c-4), and then forming the copolymer (II) by further emulsion polymerization, wherein a solid mass ratio of the (co)polymer (I)/copolymer (II) is within a range of 5/95-95/5;
- or
- (ii) crosslinked resin particles having a core/shell multilayer structure composed of a core part comprising the (co)polymer (I) and a shell part comprising a (co)polymer (III) having a glass transition temperature (Tg1) within a range of −50° C. to 110° C., wherein the (co)polymer (I) and (co)polymer (III) are obtained by emulsion polymerizing a monomer mixture containing 30-100 mass % of the polymerizable unsaturated monomer (c-1) having the C6-18 alkyl group and 0-70 mass % of the other polymerizable unsaturated monomer (c-2) to obtain the emulsion, adding to the obtained emulsion containing the (co)polymer (I) a monomer mixture of 0.1-60 mass % of a functional group-containing monomer (c-5), 0-60 mass % of a polymerizable unsaturated monomer (c-6) having a functional group complementally reactable with the functional group in the polymerizable unsaturated monomer (c-5) 0-99.9 mass % of another polymerizable unsaturated monomer (c-7) and 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-5), (c-6), and (c-7), and then forming the (co)polymer (III) by further emulsion polymerization, wherein a solid mass ratio of the (co)polymer (I)/copolymer (III) is within a range of 5/95-95/5.
3 more elements
Dependencies are inferred from the claim text.