Process for preparing polybutylene terephthalate from pet scrap

US5266601A · kind A · utility

Assignee

• Zimmer, Inc. · US

Inventors

• Manfred Kyber · Maintal, DE
• Wolfgang Schmidt · Frankfurt, DE
• Uwe Schollar · Offenbach, DE

Key dates

• Filing date: Aug 17, 1992
• Grant date: Nov 30, 1993
• Expiry date: Aug 17, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for producing polybutylene terephthalate with less than 1.0 wt % units derived from ethylene glycol from polyethylene terephthalate scrap by diolysis and ester exchange with 1,4-butanediol and subsequent polycondensation.