Process for the preparation of linear aliphatic polycarbonate from cyclic aliphatic carbonate

US4754017A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Edgar Leitz · Dormagen, DE
• Christian Lindner · Bensheim, DE
• Herbert Eichenauer · Dormagen, DE
• Karl-Heinz Ott
• Hans-Josef Buysch · Krefeld, DE
• Peter Mues · Duisburg, DE
• Hartwig Hocker · Eckersdorf, DE
• Helmut Keul · Aachen, DE

Key dates

• Filing date: Feb 24, 1987
• Grant date: Jun 28, 1988
• Expiry date: Feb 24, 2007

Classification

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

Abstract

Process for the polymerization of cyclic aliphatic carbonates in the presence of aprotic organic solvents with exclusion of atmospheric oxygen and atmospheric moisture, wherein organometallic compounds of elements of main group 1 of the periodic table are used as initiators, the monomer/solvent ratio is in the range from 1 part by weight to 50 parts by weight of monomer per 100 parts by weight of solvent and the polymerization temperature is between -100.degree. C. and +20.degree. C.