Resin composition for cationic electrodeposition coating

摘要

A resin composition for cationic electrodeposition coating contains (A) an epoxy resin (a base resin) having cationic groups and (B) a blocked polyisocyanate (a curing agent) , characterized in that the blocked polyisocyanate (B) is one in which part of the isocyanate groups have reacted with a polyol and which is blocked by (1) a blocking agent represented by a formula R-(OC 2 H 3 X) n -OH (wherein R is an alkyl having 1-6 carbon atom(s); X is H or methyl; and n is 1-6) and having a molecular weight of not less than 150 and also by (2) another blocking agent having a deblocking temperature of not higher than about 150{C.