Patent · US Expired

Polymerization of siloxanes

US6353075B1 · kind B1 · utility

10Cited by

4References

10Claims

0Family size

Assignee

Dow Corning Corporation · US

Inventors

Peter Cheshire Hupfield · Düsseldorf, DE
Avril Surgenor · Cardiff, GB
Richard Taylor · Cincinnati, US

Key dates

Filing date	Dec 9, 1999
Grant date	Mar 5, 2002
Priority date	—
Expiry date	Dec 9, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G77/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A polymerization process comprising mixing a siloxane having silicon-bonded groups R′ and a cyclic or linear siloxane having no silicon-bonded groups R′ with a phosphazene base catalyst in the presence of water and allowing the siloxane having silicon-bonded groups R′ to condense and the cyclic or linear siloxane having no silicon-bonded R′ groups to polymerize by equilibration.

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