Patent · US Active

Process for producing acetoxy-bearing siloxanes

US11286351B2 · kind B2 · utility

5Cited by

83References

20Claims

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	Apr 15, 2020
Grant date	Mar 29, 2022
Priority date	—
Expiry date	Apr 15, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L83/06
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Described is a process for producing preferably 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 preferably trifluoromethanesulfonic acid as catalyst and with addition of acetic acid, wherein the cyclic branched siloxanes of the D/T type are mixtures of cyclic branched siloxanes of the D/T type which contain not only siloxanes comprising D and T units but also siloxanes comprising Q units.

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