Patent ID: 6410655
Filing Date: 2002-06-25
Classification: C08F,C08L,C09D

Abstract:
A resin composition for an aqueous paint, comprising:different phase structure emulsion particles obtained by multi-stage emulsion polymerization as a binder; wherein the different phase structure emulsion particles have an outermost phase formed by an emulsion polymer of an ethylenic unsaturated monomer, said emulsion polymer having a glass transition temperature of from âˆ’50Â° C. to 10Â° C., and wherein said resin composition satisfies the following conditions (1) to (3): (1) the emulsion polymer forming the outermost phase of the different phase structure emulsion particles contains from 1 to 20 mass % of an ethylenic unsaturated monomer having at least one a unit selected from the group consisting of a polyethylene glycol chain, a polypropylene glycol chain and a mixture thereof; (2) at least one phase of inner phases from the outermost phase of the different phase structure emulsion particles comprises an emulsion polymer of an ethylenic unsaturated monomer, said emulsion polymer having a glass transition temperature of from 30Â° C. to 110Â° C., and (3) the binder has a minimum film-forming temperature of at most 10Â° C.; wherein the ethylenic unsaturated monomer having the polyethylene glycol chain or the polypropylene glycol chain is represented by formula (1), CH2&boxH;C(R1)â€”C(&boxH;O)â€”Oâ€”[Xâ€”O]nâ€”R2 â€ƒâ€ƒ(1) wherein R1 is H or CH3, R2 is H or a C1-C8 alkyl group, X is â€”(CH2)2â€” or â€”CH2CH(CH3)â€”, and n is an integer of from 1 to 30.