Polysiloxane-polyoxyalkylene block copolymers with different polyoxyalkylene blocks in the average molecule

US5321051A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Georg Burkhart · Essen, DE
• Rolf-Dieter Langenhagen · Hattingen, DE
• Andreas Weier · Essen, DE
• Volker Zellmer · Bottrop, DE

Key dates

• Filing date: Oct 29, 1993
• Grant date: Jun 14, 1994
• Expiry date: Oct 29, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0008
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polysiloxane-polyoxyalkylene block copolymers, which are intended for the production of polyurethane foams, are prepared. The foams obtained have an improved, finer cell structure and the collapse of the foams is reduced. It is essential for the invention that a mixture of polyoxyalkylene groups is present in the polysiloxane-polyoxyalkylene block copolymers. Further particulars are laid down for selecting the different polyoxyalkylene groups with regard to the respective molecular weights and the ratio of polyoxyalkylene groups to one another.