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US 4,375,498 AGranted
Wet-on-wet coating process
AssigneePeintures Corona S.A.
InventorsJean-Jacques Le Minez, Bernard Schmitt
Life of this patent
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Abstract
A process for coating a substrate and a coated substrate are disclosed. In a typical embodiment of the invention, a coating composition containing a capped polyisocyanate is first deposited on the substrate followed by applying, before curing the first composition, a second coating composition containing 1,2-epoxy functionality. This method of coating is referred to as wet-on-wet coating. The coated substrate is then heated in one step to cure the multilayered coating.
Claims31
A process for coating a substrate comprising:
- (A) applying to a substrate at least two coating compositions, at least one of which contains capped polyisocyanate functionality with no free isocyanate groups, and at least one of which contains 1,2-epoxy functionality;
- said coating compositions being applied to the substrate sequentially without having first cured the initially applied coating and being continuously superimposed upon one another so as to form a multilayered coating;
- (B) heating the coated substrate to a temperature sufficient to cure the multilayered coating.
A process for coating a substrate comprising:
- (A) applying to a substrate a first coating composition containing a capped isocyanate functionality with no free isocyanate groups to form a first coating thereon,
- (B) applying to said first coating prior to curing, a second coating composition containing 1,2-epoxy functionality, said coating composition being continuously superimposed upon the first coating so as to form a multilayered coating,
- (C) heating the coated substrate to a temperature sufficient to cure the multilayered coating.
Dependencies are inferred from the claim text.