Acrylic polymers substituted by n-heterocyclic rings and their use as light protection agents

Claim 1

An organic polymer containing as light stabiliser a homopolymeric compound which carries N-heterocyclic rings in a side position and has the recurring structural unit of the formula I in which R 1 is a group, containing an N-heterocyclic ring, of the formulae II, III IV and V in which R 5 is hydrogen, oxyl, C 1 ―C 18 alkyl, C 3 ―C 8 alkenyl, C 3 ―C 6 alkynyl, C 7 ―C 12 aralkyl, C 2 ―C 21 alkoxyalkyl, an aliphatic acyl group having 1―4 C atoms or one of the groups ―CH 2 COOR 7 or ―COOR 8 , in which R 7 is C 1 ―C 12 alkyl, C 3 ―C 8 alkenyl, phenyl, C 7 ―C 8 aralkyl or cyclohexyl and R 8 is C 1 ―C 12 alkyl, phenyl, benzyl or cyclohexyl, and R 6 is hydrogen or C 1 ―C 4 alkyl and Y is ―O― or in which R 9 is hydrogen, C 1 ―C 12 alkyl, C 7 ―C 12 aralkyl or cyclohexyl, and X 1 is a group of the formula ―O―CH(R 10 )―CH 2 ― (VI), in which R 10 is hydrogen, methyl, ethyl, phenoxymethyl or phenyl, and n is 0 or 1, and X 2 is a group of the formula VI, in which R 10 is as defined above, or a group of the formula ―O―CH 2 ―CH(OH)―CH 2 ― (VII), and m is 0 or 1, and R 11 is C 1 ―C 18 alkyl or is cyclohexyl, phenyl or benzyl which are unsubstituted or substituted by C 1 ―C 4 alkyl or C 1 ―C 4 alkoxy, and R 2 is hydrogen or C 1 ―C 4 alkyl, and, if R 2 and R 4 are hydrogen, R 1 and R 3 together form a group of the formula VIII in which R 5 and R 6 are as defined above and R 3 is hydrogen or C 1 ―C 2 alkyl and R 4 is hydrogen or methyl, or a copolymer thereof with a compound containing at least one polymerisable double bond, the molar ratio of the component of the formula I to the co-component being up to 1:10 and the average molecular weight of the homopolymeric or copolymeric light stabiliser being 500 to 150,000, preferably 500 to 50,000.