Patent · US Active

Process for recycling silicones

US11286366B2 · kind B2 · utility

5Cited by

95References

20Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Wilfried Knott · Essen, DE
Horst Dudzik · Essen, DE
Dietmar Schaefer · Hattingen, DE

Key dates

Filing date	Apr 15, 2020
Grant date	Mar 29, 2022
Priority date	—
Expiry date	May 13, 2040

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/62
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process for the recycling of silicones, especially silicone rubber and/or silicone oils, by the chemical transformation thereof to silanes and/or siloxanes having acetoxy groups is described, wherein silicone rubber and/or silicone oils are subjected to a heat treatment in digestion systems comprising acetic anhydride and/or acetoxysiloxane, and at least one Brønsted acid, with addition of acetic acid.

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