Method for preparing emulsion resin composition for cationic electrodeposition paint

Abstract

The present invention is to provide a method for preparing an emulsion resin composition for a cationic electrodeposition paint, which prepare a cationic electrodeposition paint composition as reducing time for desolvation time or eliminating desolvation step. The present invention provide a method for preparing an emulsion resin composition for cationic electrodeposition paint, which comprises a cationic resin and a blocked isocyanate curing agent, the method comprises the steps: (1) a step of mixing water and the cationic resin to form a W/O emulsion, (2) a step of mixing the blocked isocyanate curing agent and the W/O emulsion to form a curing agent-containing W/O emulsion, (3) a step of mixing water and the curing agent-containing W/O emulsion to form an O/W emulsion, via a phase inversion point from W/O emulsion to O/W emulsion, wherein the cationic resin comprises a cationic epoxy resin, and a solid concentration by mass XW/O (%) of the curing agent-containing W/O emulsion and a solid content by mass Xtra (%) at the phase inversion point from W/O emulsion to O/W emulsion satisfy a relation of XW/O−Xtra>3%.

Dependencies are inferred from the claim text.