Patent · US Expired

Process for the preparation of organopolysiloxanes

US4292423A · kind A · utility

61Cited by

1References

4Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Rudolf Kaufmann · Burghausen, DE
Johann Muller · Burghausen, DE
Karl-Heinrich Wegehaupt · Burghausen, DE

Key dates

Filing date	Mar 27, 1980
Grant date	Sep 29, 1981
Priority date	—
Expiry date	Mar 27, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/57
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Organopolysiloxanes having substituted carbamoyloxy groups (.tbd.SiOCO--NH--) bonded to silicon via oxygen, which are prepared by reacting an organopolysiloxane containing Si-bonded hydroxyl groups with an organic isocyanate in the presence of an organic tin compound. The stability of the organopolysiloxanes containing carbamoyloxy groups may be improved if the organopolysiloxane having Si-bonded hydroxyl groups is reacted with an organic isocyanate in the presence of an organic tin compound which is supported on a solid carrier and then the reaction product is filtered under anhydrous conditions to remove the supported organic tin compound.

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