Organo-titanate catalysts for preparing pure macrocyclic oligoesters

US6787632B2 · kind B2 · utility

Assignee

• Cyclics Corporation · US

Inventors

• Peter D. Phelps · Schenectady, US
• Timothy A. Thompson · Dresden, DE
• Yi-Feng Wang · Beijing, CN
• Donald G. Le Grand · Burnt Hills, US

Key dates

• Filing date: Oct 9, 2001
• Grant date: Sep 7, 2004
• Expiry date: Oct 9, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Organo-titanate catalysts are prepared that are useful to catalyze depolymerization of a polyester to produce macrocyclic oligoesters substantially free from macrocyclic co-oligoesters.