Patent ID: 7279200
Filing Date: 2007-10-09
Classification: B33Y,C07C,C08F,C09D,G03F

Abstract:
1. A process for producing coatings having scratch-resistant surfaces, in which (1) a photocurable formulation comprising (2) this formulation is applied to a substrate; and (3) the formulation is cured either only by exposure to electromagnetic radiation with a wavelength ranging from 200 nm into the IR region, or by exposure to electromagnetic radiation with a wavelength ranging from 200 nm into the IR region and prior, simultaneous and/or subsequent exposure to heat; wherein the formulation comprises as photoinitiator (B) at least one surface-active photoinitiator of the formula I which accumulates at the surface of the formulation R is a radical of the formula II R is naphthyl, anthracyl, phenanthryl or a heterocyclic radical, the radicals naphthyl, anthracyl, phenanthryl and/or the heterocycle being unsubstituted or substituted by C R R R R R R R A, is a surface-active radical of the formula III  in which the units IIIa, IIIb and/or IIIc  are distributed randomly or in blocks in which Y′ indicates the position where A is connected to Y; and  G  G R R r is 1 or 2; and, if r is 2, the compound of the formula I contains two radicals R which may be identical or different; s is a number from 1 to 20; n is a number from 1 to 20; p is a number 0-25; x is 1; Y if r=1, is a divalent group C Y, if r=2, is a trivalent group of the formulae: R R and at the site of a bond to the photoinitiator radical  there must always be at least one methylene group; and a is a number from 1 to 10; b, c and d independently of one another are a number from 0 to 10; with the proviso that they are, however, at least 1 if the methylene group in question is between two oxygen atoms or one oxygen and one nitrogen atom, and q is a number from 1 to 10.