Patent · US Active

Process for purifying acetoxysiloxanes

US11472822B2 · kind B2 · utility

3Cited by

90References

9Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

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

Key dates

Filing date	Apr 16, 2020
Grant date	Oct 18, 2022
Priority date	—
Expiry date	Sep 19, 2040

Classification

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

Abstract

Processes are described for purifying acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, end-equilibrated acetoxysiloxanes, wherein the acidic, preferably superacidic, in particular trifluoromethanesulfonic acid-acidified, acetic anhydride-containing and optionally acetic acid-containing equilibrated, preferably end-equilibrated acetoxysiloxane, which is optionally dissolved in an inert solvent, is contacted with a base, the precipitate is filtered off thereafter and then the filtrate obtained is optionally purified by distillation.

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