Patent ID: 6861458

Claim:
A compound of the formula wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 each, independently of the others, is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, R 11 and R 12 each, independently of the others, is an alkylene group, an arylene group, an arylalkylene group, or an alkylarylene group, n is an integer representing the number of repeat —OSi(R 7 )(R 8 )— monomer units, a is an integer representing the number of repeat —OSi(R 10 )(R 12 -lightfastness moiety)— monomer units, and c is an integer representing the number of repeat —OSi(R 9 )(R 11 -hydrophilic moiety)— monomer units, wherein the lightfastness moiety is a hydroxybenzophenone group, and wherein the hydrophilic moiety is a polyethylene oxide chain.