Aqueous coating composition
AssigneeKansai Paint Co., Ltd.
InventorsNobushige Numa, Yoshihiro Okamoto
Life of this patent
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Abstract
An aqueous coating composition comprising, as main components, (A) an aqueous dispersion of a water-dispersible acrylic copolymer of acid value 20-150 optionally having hydroxyl group, which copolymer is obtained by copolymerizing an alkoxysilane group-containing vinyl monomer with a carboxyl group-containing unsaturated monomer and, as necessary, other polymerizable monomer copolymerizable with said monomers, (B) an aqueous polyurethane resin, and optionally (C) a polyisocyanate compound. With this composition, there can be formed, on a substrate, a coating film which is excellent in water resistance and solvent resistance and which is good in adhesivity, finish of film, etc.
Claims28
An aqueous coating composition comprising, as main components,
- (A) an aqueous dispersion of a water-dispersible acrylic copolymer having an acid value of 20-150 and a hydroxyl value of 10-250, which copolymer is obtained by subjecting to solution polymerization an alkoxysilane group-containing vinyl monomer represented by the following formula (I):
- ##STR9## (wherein A is ##STR10## R.sub.1 is a hydrogen atom or a methyl group;
- R.sub.2 is a bivalent aliphatic saturated hydrocarbon group of 1-15 carbon atoms;
- R.sub.3 and R.sub.4 are each a phenyl group, an alkyl group of 1-6 carbon atoms or an alkoxy group of 1-10 carbon atoms;
- R.sub.5 is an alkyl group of 1-10 carbon atoms;
- and n is an integer of 1-100)
- with a carboxyl group-containing unsaturated monomer, a hydroxyl group-containing unsaturated monomer and, optionally, other polymerizable monomer copolymerizable with said three monomers, in an organic solvent, with the monomer of formula (I) used in an amount of 1-90% by weight based on the total amount of all the monomers,
- (B) an aqueous polyurethane resin, and
- (C) a polyisocyanate compound having at least two isocyanate groups in the molecule, in which coating composition the ratio of the hydroxyl group of the acrylic copolymer (A) and the isocyanate group of the polyisocyanate compound (C) is in the range of about 0.2:1 to about 3:1 in terms of NCO:OH equivalent ratio.
An aqueous coating composition comprising, as main components,
- (A) an aqueous dispersion of a water-dispersible acrylic copolymer having an acid value of 20-150, and a weight-average molecular weight of 3,000-200,000, which copolymer is obtained by subjecting to solution polymerization an alkoxysilane group-containing vinyl monomer represented by the following formula (I):
- ##STR11## wherein A is ##STR12## R.sub.1 is a hydrogen atom or a methyl group;
- R.sub.2 is a bivalent aliphatic saturated hydrocarbon group of 1-15 carbon atoms;
- R.sub.3 and R.sub.4 are each a phenyl group, an alkyl group of 1-6 carbon amounts or an alkoxy group of 1-10 carbon atoms;
- R.sub.5 is an alkyl group of 1-10 carbon atoms;
- and n is an integer of 1-100,
- with a carboxyl group-containing unsaturated monomer and, optionally, other polymerizable monomer copolymerizable with said two monomers, in an organic solvent, with the monomer of formula (I) used in an amount of 1-90% by weight based on the total amount of all the monomers, and
- (B) an aqueous polyurethane resin.
Dependencies are inferred from the claim text.