Polyesters which contain maleate groups

US6350849B1 · kind B1 · utility

Assignee

• Dainippon Ink and Chemicals, Inc. · JP

Inventors

• Rainer B. Frings · Berlin, DE
• Gerwald Grahe · Berlin, DE
• Shinichi Nonaka · Nishitokyo, JP

Key dates

• Filing date: Aug 3, 2000
• Grant date: Feb 26, 2002
• Expiry date: Aug 3, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L67/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The production is described of unsaturated polyesters, which exclusively contain maleate groups in their main chain, by the ring-opening polymerization of epoxides, such as glycidyl ethers, glycidyl esters and olefine epoxides, with &agr;,&bgr;-unsaturated anhydrides, preferably such as maleic anhydride, both on their own and in admixture with other cyclic anydrides, in the presence of a Zn2+ carboxylate. The polyesters which are thus produced are characterized by high molecular weights and a narrow molecular weight distribution. Polymerization can be effected between 50 and 120° C., but is preferably effected between 60 and 90° C., either in the melt or in a solvent. Unsaturated reactive thinners, which after the addition of suitable radical initiators react thermally or photochemically with the polyesters to form lacquers, cast parts or fiber-reinforced composite materials, can also be employed as solvents. The preferred crosslinking agents for the polyesters are mono- and polyfunctional acrylates, methacrylates, vinyl ethers and vinyl esters. The polyesters can also be completely or partially isomerized, either thermally or by catalysis, to form polyesters which comprise…