Patent ID: 8013047

Claim:
A composition comprising (a) a synthetic polymer which is susceptible to oxidative, thermal or light-induced degradation and (b) at least one compound of the formula I wherein R 0 is a direct bond, R 1 and R 2 are each independently of the other a silicon containing group, R 3 and R 4 are each independently of the other hydrogen, a fluorine containing group, a silicon containing group, C 1 -C 12 alkyl, phenyl or R 3 and R 4 , together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylidene ring that is unsubstituted or substituted by from 1 to 3 C 1 -C 4 alkyl groups; R 5 , R 6 , R 7 and R 8 are each independently of the other hydrogen, C 1 -C 12 alkyl or C 3 -C 12 alkenyl, X 1 and X 2 are each independently of the other C 1 -C 12 alkylene or C 4 -C 25 alkylene interrupted with oxygen; Y 1 and Y 2 are each independently of the other a direct bond, oxygen, R 9 and R 10 are each independently of the other a direct bond or C 1 -C 4 alkylene, R 11 , R 12 and R 13 are each independently of the other hydrogen, C 1 -C 12 alkyl or C 3 -C 12 alkenyl, R 14 is hydrogen, C 1 -C 12 alkyl or a silicon containing group, m is 0 to 10,000, and n is 0 to 10,000 and where the silicon containing group is of formula II wherein R 17 , R 18 , R 19 and R 20 are each independently of the other C 1 -C 12 alkyl, C 1 -C 12 alkyl substituted with hydroxy or amino; C 4 -C 12 hydroxyalkyl interrupted with oxygen; or R 21 is C 1 -C 12 alkyl or R 22 , R 23 , R 24 , R 25 , R 26 , R 27 , R 28 and R 29 are each independently of the other C 1 -C 12 alkyl or C 1 -C 12 alkyl substituted with hydroxy or amino; p is 0 to 200 and q is 0 to 200.