Working up polysiloxane/polycarbonate copolymers

Details Working up polysiloxane/polycarbonate copolymers Working up polysiloxane/polycarbonate copolymers

1976-12-03

1978-07-25

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

528197, 528 25, C08L 4304

Patent

active

041029402

ABSTRACT:
In the preparation and working up of a SiOC-linked polysiloxane/polycarbonate copolymer comprising reacting an .alpha.,.omega.-dihalogenopolysiloxane with an .alpha.,.omega.-dihydroxy-oligocarbonate in the presence of a tertiary amine and a solvent, and subsequently separating off the resulting copolymer from the reaction mixture additionally containing the amine, amine hydrochloride and organic solvent, the improvement which comprises subjecting the reaction mixture to steam distillation whereby the copolymer remains behind. Advantageously, the copolymer reaction solution is added to an aqueous solution having a pH of 7 to 8 whereby the amine and hydrogen chloride also distill over. If a surface active agent is present in the aqueous solution the product will be of very fine particle size.

REFERENCES:
patent: 3819744 (1974-06-01), Buckner et al.

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