Biologically degradable polyester, materials made from the polyester and production process

US6150490A · kind A · utility

Assignee

• Degussa-Huels AG · DE

Inventors

• Wolf-Dieter Deckwer · Braunschweig, DE
• Rolf Muller · Marburg, DE
• Uwe Witt · Mutterstadt, DE
• Hans-Jürgen Arning · Soest, DE

Key dates

• Filing date: Aug 14, 1998
• Grant date: Nov 21, 2000
• Expiry date: Aug 14, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2230/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention concerns biologically degradable polyesterS which are degraded under the action of micro-organisms in the natural environment. Said polyesters are high molecular weight satistical copolyesters which are made using an aliphatic polyalcohol, an aromatic polycarboxylic acid and also an aliphatic polycarboxylic acid as monomer components. They contain constitutional repeating or recurrent units comprising (i) a polyalcohol and an aromatic polycarboxylic acid and (ii) a polyalcohol and an aliphatic polycarboxylic acid, where over 90% of the units of type (i) are directly bonded with none or at most one other unit of type (i). The polyesters are produced by using a di-isocyanate as an additional monomer component, less isocyanate being used than any of the other monomer components. The present invention also concerns materials made from said biodegradable polyester and a process for producing said polyesters.