METHODS FOR REPAIRING DEFECTS IN AUTOMOTIVE COATINGS

摘要

A method of repairing defects in automotive coatings is disclosed. More particularly, the invention relates to a method of repairing defects in color-clear composite coatings.

主权项

1. A method of repairing a defect in a multilayer coating applied to a motor vehicle at the end of an assembly process comprising a color-imparting basecoat and transparent topcoat comprising:
(a) repairing the defect, and (b) applying a basecoat composition to the repaired area to form a basecoat layer wherein the basecoat layer is formed by depositing a polyhydrazide-containing curable aqueous composition comprising:
(i) a continuous phase comprising water, and(ii) a dispersed phase comprising:
(A) polymeric particles prepared from the polymerization of a mixture of ethylenically unsaturated monomer compounds, including ethylenically unsaturated monomers comprising:
(1) one or more multi-ethylenically unsaturated monomers and(2) one or more aldo or keto group-containing ethylenically unsaturated monomers, and (c) applying a transparent clearcoat composition to the basecoat layer to form a topcoat layer, and (d) curing the basecoat layer and the topcoat layer simultaneously at a temperature of 60 to 100° C.