C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 77/44 (2006.01) C08G 77/52 (2006.01)
Patent
CA 2351071
Linear-chain copolysiloxanes comprising units of the general formulae (1) and (2), [-(R1R2SiO)a-] (1) [-(R3R4Si-R7-SiR5R6O)b-R3R4Si-R7-SiR5R6-] (2), the end-groups of which may be Si-H or Si-OH, are prepared by reacting: (A) diorganopolysiloxanes of the general formula (3) HO-(R1R2SiO)a-H (3) with (B) silarylenesiloxane compounds of the general formula (4) H-[(R3R4Si-R7-SiR5R6O)b-R3R4Si-R7-SiR5R6]-H (4), in the presence of (C) a transition metal catalyst, wherein R1, and R2 are optionally substituted and optionally heteroatom-containing hydrocarbon radicals, R3, R4, R5, and R6 are optionally halogen-substituted and optionally heteroatom-containing aliphatically or aromatically unsaturated C1-20 hydrocarbon radicals, and R7 is an aromatic, optionally substituted, and optionally heteroatom-containing divalent hydrocarbon radical. The copolysiloxanes are well defined, and have internal blocks corresponding to the (3) and (4) starting materials, substantially free of rearrangement and equilibration products.
Egerter Norbert
Muller Philipp
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Wacker-Chemie Gmbh
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