Patent ID: 7928152

Claim:
A cationic electrodeposition paint which contains a base resin, said base resin being an amine-added epoxy resin, a curing agent, said curing agent being a blocked polyisocyanate compound, and at least one polyether compound which is selected from the group of compounds represented by the following formulae (1) and (4): in which: R 1 and R 3 stand for C 1-10 alkyl or phenyl independently of each other, R 2 stands for hydrogen or methyl, and where p is not less than 2, the plural R 2 s in the formula (1) may be the same or different, R 5 stands for C 4-9 branched chain alkylene, R 6 and R 7 stand for hydrogen, methyl or ethyl independently of each other, and where each of m and n is not less than 2, the plural R 6 s or R 7 s in the formula (4) may be the same or different, p is an integer of 0-4, m and n are integers of 1-5, independently of each other, the polyether compounds of the formula (1) being obtained through a reaction of a glycidyl ether compound represented by the following formula: in which R 1 has the same meaning as defined above, with an alcoholic compound represented by the following formula: in which R 2 , R 3 and p have the same meanings as defined above, the polyether compounds of the formula (4) being obtained through a reaction of a diol selected from the group consisting of 1,3-butanediol, 2,3-butanediol, 1,2-butanediol, 3-methyl-1,2-butanediol, 1,2-pentanediol, 1,4-pentanediol, 2,4-pentanediol, 2,3-dimethyltrimethylene glycol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 3-methyl-4,3-pentanediol, 3-methyl-4,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,5-hexanediol, 2,5-hexanediol and neopentyl glycol with alkylene oxides represented by the following formulae: in which R 6 and R 7 have the same meanings as defined above, and the blend ratio of said polyether compound being in a range of 0.1-20 weight parts, as solid, per 100 parts of combined solid contents of the base resin and the curing agent, said paint comprising an emulsion which is prepared by making water-dispersible the base resin, the curing agent and the polyether compound with a neutralizing agent in an aqueous medium.