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C - Chemistry – Metallurgy – 08 – G

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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.

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