Patent ID: 6960678

Claim:
A compound of formula III in which Z and Z′ are independently H, a lower alkyl, or Q 3 Si where Q is a lower alkyl, or Q is an aryl of four to ten carbon atoms n′ is 2-50; each of A and B is independently a) a C 3 -C 10 alkyl or a substituent obtained by substituting at least one carbon atom of a C 3 -C 10 alkyl group with a heteroatom, b) an aryl of four to seven carbons or heteroatoms, c) a cyclic of three to ten carbons or heteroatoms, or moieties of the formulas wherein in d), e) and f), CH is bonded to silicon; wherein R 1 to R 11 are independently hydrogen, alkyl of 1 to 10 carbons or heteroatoms, aryl of 4 to 14 carbons or heteroatoms, arylalkyl of 5 to 20 carbons or heteroatoms, substituted carbonyl or unsubstituted carbonyl; wherein said heteroatoms is selected from the group consisting of nitrogen, oxygen, silicon and sulfur; and wherein at least one of A and B, or both A and B are selected from the group consisting of d), e) and f).