Patent · US Active

Method for condensation polymerization of hydroxyl-terminated polydiorganosiloxanes

US11136436B2 · kind B2 · utility

0Cited by

30References

16Claims

0Family size

Assignees

Dow Silicones Corporation · US
DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

John A. Roberts · Salt Lake City, US
Matthew E. Belowich · Midland, US
Thomas H. Peterson · Charleston, US
Vladimir Pushkarev · Mount Pleasant, US
Evelyn Auyeung · New York, US
Mark Rickard · Midland, US

Key dates

Filing date	Jul 3, 2019
Grant date	Oct 5, 2021
Priority date	—
Expiry date	Jul 3, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L83/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A method for making long chain hydroxyl terminated polydiorganosiloxanes with low cyclics content via condensation polymerization employs a selective catalyst. The catalyst includes a salt-anion complex and a free acid.

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