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OwnerShinsuke Shirakawa, Toshiaki Indou +2inventors
InventorsShinsuke Shirakawa, Toshiaki Indou, Yasuo Mihara, Naotaka Kitamura
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The present invention provides a cationic electrodeposition coating composition having good appearance of coated film and high throwing power, and a method for making an amine-modified epoxy resin used for the cationic electrodeposition coating composition. The present invention relates to a method for making an amine-modified epoxy resin comprised in a cationic electrodeposition coating composition comprising the steps of: providing a half blocked isocyanate by reaction of an isocyanate compound with a blocking agent, preparing a blocked prepolymer by reaction of the half blocked isocyanate with a polyol, forming an epoxy resin containing oxazolidone ring by reaction of the blocked prepolymer with a diglycidyl ether type epoxy resin, chain-extending the epoxy resin containing oxazolidone ring with at least saturated or non-saturated hydrocarbon group containing dicarboxylic acid, and modifying the chain-extended epoxy resin with an amine.
1-9. (canceled)
A cationic electrodeposition coating composition comprising a binder resin emulsion comprising
A method of restraining the occurrence of gas pin hole when conducting electrodeposition coating having high throwing power, wherein the cationic electrodeposition coating composition used in the step of conducting electrodeposition coating comprises a binder resin emulsion emulsified by an emulsion resin (c) having an epoxy equivalent of 1,000 to 1,800, and has 35 to 70 meq of the quaternary ammonium group, based on 100 g of the emulsion resin.
Dependencies are inferred from the claim text.