Method of producing highly condensed polyester granulate

US7084235B2 · kind B2 · utility

Assignee

• Zimmer, Inc. · US

Inventors

• Brigitta Otto · Lenzen (Elbe), DE
• Holger Bachmann · Weiterstadt, DE
• Roland Schafer · Rottweil, DE

Key dates

• Filing date: Jul 20, 2004
• Grant date: Aug 1, 2006
• Expiry date: Jul 20, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31507
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Latent heat crystallized polyesters and copolyesters of a degree of crystallization greater than 38% and made by a process in which, without prior additive admixtures and without further cooling, the granulate is fed directly from the latent heat crystallization into a solid phase polycondensation reactor and condensed to a higher viscosity and subjected to acetaldehyde reduction. Alternatively without additive admixtures the granulate is subjected to dealdehydization and then worked up into bottles.