Copolymers based on aliphatic polycarbonates and lactams

US4377670A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heinrich Krimm · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Artur Botta · Krefeld, DE

Key dates

• Filing date: Oct 23, 1981
• Grant date: Mar 22, 1983
• Expiry date: Oct 23, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G71/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Anionic copolymers of lactams and aliphatic polycarbonates having urethane and carboxylic acid ester groups, preferably having recurring structural units of the formula: EQU --NH--CO--O--Y--O--CO--(CR.sub.2).sub.n -- wherein PA1 R represents hydrogen or C.sub.1 -C.sub.4 -alkyl; PA1 n represents an integer of from 2 to 13; PA1 Y represents the residue of an alcohol of the following formula: EQU HO--X--OH, wherein PA1 X represents an open-chain, cyclic or mixed open-chain-cyclic alkylene radical having from 2 to 12 carbon atoms which is optionally substituted by C.sub.1 -C.sub.4 -alkyl and optionally interrupted by from 1 to 3 oxygen atoms, or a polyethylene glycol having a molecular weight up to 10,000 or an alkoxylation product of bifunctional phenols.