Patent ID: 8729163

Claim:
A composition, which comprises a) a compound of formula (I) wherein one of R 1 and R 2 represents hydrogen and the other a substituent selected from the group consisting of C 1 -C 20 alkyl, hydroxy-C 2 -C 8 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 aryl, C 1 -C 12 alkyl-C 6 -C 20 aryl, C 6 -C 20 aryl-C 1 -C 4 alkyl, mono-or bicyclic C 5 -C 20 cycloalkyl, mono-or bicyclic C 1 -C 12 alkyl-C 5 -C 20 cyclo-alkyl and mono-or bicyclic C 5 -C 20 cycloalkyl-C 1 -C 4 alkyl; or both R 1 and R 2 independently of one another represent substituents selected from the group consisting of C 1 -C 20 alkyl, hydroxy-C 2 -C 8 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 aryl, C 1 -C 12 alkyl-C 6 -C 20 aryl,C 6 -C 20 aryl-C 1 -C 4 alkyl, mono-or bicyclic C 5 -C 20 cycloalkyl, mono-or bicyclic C 1 -C 12 alkyl-C 5 -C 20 cyclo-alkyl and mono-or bicyclic C 5 -C 20 cycloalkyl-C 1 -C 4 alkyl; or R 1 and R 2 together represent C 2 -C 5 alkylene; and R represents hydrogen or a group of partial formula (A) wherein R 1 ′ and R 2 ′ are defined as R 1 and R 2 ; or a salt of a compound of formula (I); and b) a polymer substrate.