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US 5,508,352 AGranted
Carboxyl and carboxylate polymer with hydroxyl and epoxy polymer
AssigneeNippon Paint Co., Ltd.
InventorsShigeyuki Sasaki, Takeshi Takagi, Yoshitaka Okude
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Abstract
The present invention provides, a curable resin composition and a process for forming a cured film therefrom wherein the cured film has not only excellent acid resistance but also good weather resistance, good mar resistance and sealer cracking resistance because of its high extensibility, The curable resin composition comprises (a) 20 to 80% by weight of a polymer having carboxyl and carboxylate groups; and (b) 20 to 80% by weight of a polymer having hydroxyl and epoxy groups.
Claims10
A curable resin composition comprising:
- (a) 20 to 80% by weight of a polymer having carboxyl and carboxylate groups prepared by half-esterifying
- (1) a polymer having carboxyl and anhydride groups prepared by copolymerizing (i) 5 to 90% by weight of a carboxyl group-containing ethylenically unsaturated monomer prepared by half-esterifying a hydroxyl group-containing ethylenically unsaturated monomer with an anhydride group-containing compound in an molar ratio of the hydroxyl group to the anhydride group of 1/1.0 to 1/0.5, (ii) 10 to 40% by weight of an anhydride group-containing ethylenically unsaturated monomer and (iii) 0 to 85% by weight of a copolymerizable ethylenically unsaturated monomer which is different from (i) and (ii), with
- (2) a monoalcohol having 1 to 12 carbon atoms;
- and
- (b) 20 to 80% by weight of a polymer having hydroxyl and epoxy groups prepared by copolymerizing (1) 5 to 60% by weight of a hydroxyl group-containing ethylenically unsaturated monomer, (2) 10 to 60% by weight of an epoxy group-containing ethylenically unsaturated monomer and (3) 0 to 85% by weight of a copolymerizable ethylenically unsaturated monomer which is different from (1) and (2).
2 more elements
Dependencies are inferred from the claim text.