Patent ID: 7511110

Claim:
A crosslinkable polyorganosiloxane composition comprising (A) polyorganosiloxane(s) which bear radicals having aliphatic carbon-carbon multiple bonds, (B) polyorganosiloxanes with Si-bonded hydrogen atoms, or, (C) instead of or in addition to (A) and (B), polyorganosiloxanes which bear SiC-bonded radicals with aliphatic carbon-carbon multiple bonds and also have Si-bonded hydrogen atoms, and (D) at least one platinum catalyst of the structures: in which R 1 is an optionally substituted diene which is bonded to platinum by at least one bond and is an unbranched or branched chain having from 4 to 18 carbon atoms, a cyclic or bicyclic system having from 6 to 28 carbon atoms, e is 0, 1, 2 or 3, f is 0, 1, 2 or 3, with the proviso that e+f is 4 for silanes and is 0, 1, 2 or 3 for siloxanes, and that at least one unit where e does not equal 0 is present, U is O, NR 2 , or Nâ€”C(â•O)â€”NR 2 W is NR 7 , C(R 3 )â€”CO 2 R 3 , C(R 3 )â€”C(=Z)-R 3 , S, O, or C(R 3 ) 2 X is NR 2 , C(R 3 )â€”CO 2 R 3 , C(R 3 )â€”C(=Z)-R 3 , S, O, or C(R 3 ) 2 Y is NR 2 , C(R 3 )â€”CO 2 R 3 , C(R 3 )â€”C(=Z)-R 3 , S, O, or C(R 3 )â€”CN Z is O, S, Se, NR 2 , or CR 4 2 R 2 are each independently hydrogen or a monovalent optionally substituted hydrocarbon radical having from 1 to 24 carbon atoms which optionally contains one or more heteroatoms in the chains or the rings, preferably a heteroatom selected from among the O, S, Se, N, P, and As, R 3 are each independently hydrogen, or a monovalent, optionally substituted hydrocarbon radical having from 1 to 28 carbon atoms, R 4 are each independently hydrogen, or a monovalent, optionally substituted hydrocarbon radical having from 1 to 24 carbon atoms, with the proviso that at least one radical is â€”CN, â€”CO 2 R 3 , â€”C(â•O)â€”R 3 , â€”NO 2 , â€”C(â•O)â€”H or halogen, R 5 are each independently divalent, optionally substituted hydrocarbon radicals having from 1 to 26 carbon atoms, R 6 are each independently monovalent, optionally substituted hydrocarbon radicals having from 1 to 20 carbon atoms and R 7 are each independently monovalent, optionally substituted hydrocarbon radicals having from 1 to 20 carbon atoms.