Patent ID: 11859053
Assignee: EVONIK OPERATIONS GMBH
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A process for producing SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units, comprising the steps of:
(a) pretreating acidified end-equilibrated α,ω-diacetoxypolydimethylsiloxanes with a base with optional subsequent distillative purification of the α,ω-diacetoxypolydimethylsiloxanes previously treated with base
(b) reacting the α,ω-diacetoxypolydimethylsiloxanes resulting from (a) with polyether diols in the presence of a solid, liquid or gaseous base, optionally using inert solvents.