Patent ID: 11905376
Assignee: EVONIK OPERATIONS GMBH
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymer, comprising repeating (AB) units produced by a process for producing SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units by reaction of polyether diols with trifluoromethanesulfonic acid-acidified, end-equilibrated α,ω-diacetoxypolydimethylsiloxanes, wherein the reaction is undertaken by adding a solid, liquid or gaseous base, in the presence of one or more inert solvents, wherein the proportion of the siloxane blocks A in the total copolymer is between 25 and 50 percent by weight, wherein said end equilibrated α,ω-diacetoxypolydimethylsiloxanes has a sum of a content fractions of cyclic siloxanes comprising D4, D5 and D6 of less than 13 percent by weight.