Sequential copolymers based on cyclic carbonates and esters

US4965300A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Eichenauer · Dormagen, DE
• Edgar Leitz · Dormagen, DE
• Karl-Heinz Ott

Key dates

• Filing date: Nov 27, 1989
• Grant date: Oct 23, 1990
• Expiry date: Nov 27, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers having a sequential structure of the following formula EQU --A--X--B].sub.r (I) with r=1 to 20, in which --A-- is a polymer of a cyclic carbonate, --B-- is a polymer of a lactone and --X-- is a link, with a decreasing concentration of residues of the cyclic carbonate in the --B-- direction and a decreasing concentration of residues of the lactone in the --A-- direction, and the use of the these products as molding compositions.