Patent · US Expired

Method for the synthesis of polyether siloxanes

US5391679A · kind A · utility

10Cited by

5References

10Claims

0Family size

Assignee

Th. Goldschmidt. AG · DE

Inventors

Georg Burkhart · Essen, DE
Dietmar Schaefer · Hattingen, DE
Andreas Weier · Essen, DE
Dietmar Wewers · Bottrop, DE

Key dates

Filing date	May 17, 1993
Grant date	Feb 21, 1995
Priority date	—
Expiry date	May 17, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G77/46
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.

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