Patent ID: 6582575
Filing Date: 2003-06-24
Classification: B05D

Abstract:
A coating film-forming method comprising a first step which comprises coating a cationic electrodeposition coating composition (A) containing an electrically conducting agent so that a cured coating film formed therefrom have a volume resistivity of 1012 &OHgr;Â·cm or less onto a metal substrate selected from the group consisting of an automobile body and automobile parts, followed by washing with water and heat curing and drying to form a cured cationic electrodeposition coating film;a second step which comprises coating such an anionic electrodeposition coating composition (B) that a coating film formed therefrom has a chromatic color or a white color as an achromatic color onto the cured cationic electrodeposition coating film, followed by washing with water, and removing water by preheating or air blowing to form a non-cured anionic electrodeposition coating film; and a third step which comprises coating a topcoating composition (C) thereonto to form a non-cured topcoating film, and heat curing and drying a resulting laminated coating film simultaneously.