Patent ID: 6676999
Filing Date: 2004-01-13
Classification: C08G,C09D

Abstract:
A process for the curing of a polymerizable composition comprising(A) a coating system comprising the following combination of components (I) or (II) or (III) or mixtures thereof, wherein (I) is a polyacrylate polyol and/or polyester polyol in admixture with melamine, a melamine resin or hexamethoxymethylmelamine, (II) is a polyacrylate polyol and/or polyester polyol in admixture with a blocked or unblocked polyisocyanate, and (III) is a carboxyl-, anhydride- or amino-functional polyester and/or polyacrylate in admixture with an epoxy-functional polyester or polyacrylate; and (B) a monomeric or oligomeric compound having at least one ethylenically unsaturated double bond and in addition containing one or more OH-groups, or one or more NH2-groups, or one or more COOH-groups, or one or more epoxy-groups or one or more NCO-groups, it being necessary for a spacer group of at least 4 linearly linked atoms to be present between the double bond and the functional group, wherein components (A) and (B) do not contain halogen, and (C) at least one photoinitiator that is capable of initiating radical polymerization, that comprises the steps of applying the coating system onto a substrate, subjecting the coating system to thermal treatment and, for the purpose of improving the surface properties, subsequently subjecting the coating system to photochemical treatment with light of a wavelength from 200 to 600 nm.