Patent ID: 9533328
Date: 2017-01-03
CPC Classifications: B05D,C08G,C09D

Claim:
1. A method for coating an automobile body, comprising: a base-coating coating step of simultaneously coating a base coating on both parts among a resin part and a steel sheet part of an automobile body to form a base coating film thereon; a clear-coating coating step of simultaneously coating a clear coating on both parts among the resin part and the steel sheet part on which the base coating film was formed to form a clear coating film thereon; and a curing step of baking the dear coating film to cure, wherein the clear-coating coating step coats a clear coating composition that comprises: a base resin containing acrylic polyol; a crosslinking agent consisting of an active methylene blocked isocyanate and melamine resin; and a curing catalyst that contains dibutyltin dilaurate as a blocked isocyanate curing catalyst, and p-toluene sulfonic acid as a melamine curing catalyst, wherein a mass ratio of the base resin to the melamine resin is 1.5 to 9.0, when defining a total of mass percentage of the base resin and mass percentage of the melamine resin in the composition as 100% by mass, the minimum value for mass percentage of the active methylene blocked isocyanate in the composition is calculated according to formula (1) below, and the maximum value thereof is calculated according to formula (2) below, and wherein the base-coating coating step coats a base coating that contains the active methylene blocked isocyanate and the melamine resin, which are the same as those blended in the clear coating composition, [Math. 1]