Patent ID: 6929828
Filing Date: 2005-08-16
Classification: B33Y,C08F

Abstract:
1. A process for the production of a coating having a scratch-resistant durable surface, which comprises (1) preparing a photocurable formulation comprising (2) applying the formulation to a substrate; and (3) curing the formulation either wherein the formulation comprises as photoinitiator (B) at least one surface-active photoinitiator, concentrated at the surface of the formulation after applying the formulation to the substrate, of formula Ia or Ib: R and R or R and R R R R R R R R R R R with the proviso that in formulae (Ia) and (Ib) at least one substituent A-X-, A A, A wherein the units IIIa1, IIIa2, IIIa3, IIIa4, IIIa5, IIIa6, IIIa7, IIIb and/or IIIc are distributed randomly or in blocks, and in which formulae the circle is intended to denote that a radical R, R 1 , R 2 , R 3 , R 4 , R 5 as defined above is substituted by the silyl radical of formula (III) by way of the bridge X, X 1 , X 2 , X 3 , X 4 , X 5 ; or A, A n is a number from 1 to 1000 or, when the siloxane starting material is a mixture of oligomeric siloxanes, n can also be less than 1 but greater than 0; m is a number from 0 to 100; p is a number from 0 to 10 000; A G G or G R R X and X and X and X X X X X —U— is —COO—, —(CH a, b and c are each independently of the others a number from 0 to 10; with the proviso, however, that they are at least 1 when the methylene group is positioned between two oxygen atoms or between an oxygen atom and a nitrogen atom, d is a number from 1 to 10.