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US 5,183,504 AGranted
Aqueous coating composition
AssigneeNippon Paint Co., Ltd.
InventorsTeruaki Kuwajima, Shinichiro Umeda, Sakuichi Konishi
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Abstract
Disclosed is an aqueous coating composition which keeps in high nonvolatile contents during coating operation and is capable of being effectively applied even under a relatively high humidity condition. The coating composition imparts high orientation of metallic pigment particles to the cured film. The aqueous coating composition of the present invention comprises a specific acryl polymer varnish (a) and a specific urethane oligomer dispersion.
Claims8
An aqueous coating composition comprising:
- (a) an aqueous varnish of a film-forming polymer having a number average molecular weight of 6,000 to 50,000, prepared by copolymerizing 5 to 40% by weight of a (meth)acrylamide, 3 to 15% by weight of acidic group-containing ethylenic monomers, 10 to 40% by weight of hydroxyl group-containing ethylenic monomers and the balance of ethylenic monomers other than acidic group-containing ethylenic monomers and hydroxy group-containing ethylenic monomers, and a portion of the acid groups is neutralized,
- (b) an aqueous dispersion of a urethane oligomer in an aqueous medium containing either a primary or secondary polyamine or both, prepared by reacting polycarbonate diols having a molecular weight of 100 to 5,000, diisocyanate compounds and active-hydrogen containing hydrophilic compounds under isocyanate-rich conditions, followed by dispersing the reaction product in the aqueous medium;
- said polymer varnish (a) being present in an amount of 95 to 10 wt % (solid) and the oligomer dispersion being present in an amount of 5 to 90 wt % (solid) in said composition.
Dependencies are inferred from the claim text.