Patent · US Active

Process for producing acetoxy-bearing siloxanes

US11021575B2 · kind B2 · utility

13Cited by

98References

16Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Wilfried Knott · Essen, DE
Horst Dudzik · Essen, DE
Frauke Henning · Essen, DE
Jan Caßens · Recklinghausen, DE

Key dates

Filing date	Jul 1, 2019
Grant date	Jun 1, 2021
Priority date	—
Expiry date	Jul 25, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G77/70
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Described is a process for producing trifluoromethanesulfonic acid-acidified, end-equilibrated, acetoxy-bearing siloxanes which comprises reacting cyclic siloxanes, in particular comprising D4 and/or D5, and/or cyclic branched siloxanes of the D/T type with acetic anhydride using trifluoromethanesulfonic acid as catalyst and with addition of acetic acid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.