Cationic electrodeposition coating composition.

摘要

The present invention provides a cationic electrodeposition coating composition which satisfies both stability of paint with time and corrosion resistance when baked at low-temperature. A cationic electrodeposition coating composition compries: (A) a cationic resin; (B) a low-temperature dissociation type block isocyanate curing agent; and (C) a pigment paste containing a pigment dispersed in a cationic pigment dispersing resin, wherein said cationic pigment grinding resin is prepared by introducing primary amino groups into a hydrophobic resin for pigment dispersion and neutralizing with acid, said hydrophobic resin has an SP value of 10.0 to 11.0, number of amino groups in one molecule is average 1.6 to 4.0, and a weight ratio of component A:B:C is 10 to 88:10 to 50:2 to 50.