Process for the preparation of aliphatic polycarbonates with alkoxy silane initiator

US4879367A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl-Erwin Piejko · Bensberg, DE
• Bruno Bomer · Bensberg, DE
• Hans-Josef Buysch · Krefeld, DE
• Michael Hullmann · Bensheim, DE

Key dates

• Filing date: Jun 29, 1988
• Grant date: Nov 7, 1989
• Expiry date: Jun 29, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/0208
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the preparation of aliphatic polycarbonates by polymerizing cyclic aliphatic carbonates in the presence of initiators and/or catalysts, in which the initiators used are alkoxy silanes of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 independently of one another represent a C.sub.1 -C.sub.4 -alkyl radical, n is an interger from 1 to 6 and PA0 R.sub.4 denotes an n-valent, optionally substituted, aliphatic hydrocarbon radical, and the catalysts used are the nucleophilic catalysts which are known from group transfer polymerization.