Process for the solid state polycondensation of linear polyesters

US4069194A · kind A · utility

Assignee

• Zimmer, Inc. · US

Inventors

• Werner Gey · Offenbach am Main, DE
• Wolfgang Langhauser
• Helmut Heinze · Frankfurt am Main, DE
• Hans-Joachim Rothe
• Peter C. Freund · Ketsch, DE

Key dates

• Filing date: Nov 7, 1975
• Grant date: Jan 17, 1978
• Expiry date: Nov 7, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S524/908
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A separating or anticaking agent consisting of spherical glass particles having a diameter of 3 to 30.mu. is added to polyester resin granulates to prevent agglomeration during solid state polycondensation in a plug-flow reactor. Thin-walled articles formed from the end product are characterized by high strength, high transparency, crystal clear color, good gas impermeability and a smooth surface.