Patent ID: 7439380

Claim:
A 4,4-diarylbutadiene-substituted diorganopolysiloxane having the structural formulae (1) or (2): in which A is a radical of formula (3) below: in which the radicals R 1 , which may be identical or different, are each a hydroxyl radical, a saturated or unsaturated, linear or branched C 1 -C 10 alkyl radical, a saturated or unsaturated, linear or branched C 1 -C 10 alkoxy radical, with the proviso that two adjacent groups R 1 may together form a C 1 -C 3 alkylenedioxy ring; n is an integer ranging from 0 to 2; the radical Z is hydrogen, —(C═O)OR 2 , —(C═O)R 3 , —(C═O)NR 4 R 5 , —SO 2 R 6 , —CN or —(C═O)—X-L; X is —O— or —NR 4 —; L is a divalent radical attaching the radical A to the silicone chain and corresponding to one of the formulae (a), (a′) or (a″) below: in which W is a saturated or unsaturated, linear or branched C 1 C 6 alkylene radical, optionally substituted with a hydroxyl radical or a saturated or unsaturated, linear or branched C 1 -C 8 alkyl radical; Y is a hydrogen atom, a hydroxyl radical or a saturated or unsaturated, linear or branched C 1 -C 8 alkyl radical; p is 0 or 1; the radicals R, which may be identical or different, are each a saturated or unsaturated, linear or branched C 1 -C 20 alkyl radical, a phenyl radical, a 3,3,3-trifluoropropyl radical or a trimethylsilyloxy radical, at least 80% in numerical terms of the radicals R being methyl radicals; the radicals B, which may be identical or different, are each a radical R or a radical A; r is a number ranging from 0 to 50; s is a number ranging from 0 to 20 and if s is 0, at least one of the two radicals B is a radical A; u is a number ranging from 1 to 6 inclusive; t is a number ranging from 0 to 10; t + u is greater than or equal to 3; the radical R 2 is hydrogen or a saturated or unsaturated, linear or branched C 1 -C 20 alkyl radical; the radical R 3 is a saturated or unsaturated, linear or branched C 1 -C 20 alkyl radical or a C 6 -C 12 aryl radical; the radicals R 4 and R 5 , which may be identical or different, are each hydrogen or a saturated or unsaturated, linear or branched C 1 -C 20 alkyl radical; and the radical R 6 is a saturated or unsaturated, linear or branched C 1 -C 20 alkyl radical or a C 6 -C 12 aryl radical, with the proviso that when two groups (C═O)—X-L- are present, L is bonded to only one group A or B of formula (1) or (2), or mixture thereof.