The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2017
Filed:
Nov. 27, 2013
Sulzer Chemtech Ag, Winterthur, CH;
Liborio Ivano Costa, Winterthur, CH;
Philip Nising, Oetwil am See, CH;
Francesca Tancini, Wettingen, CH;
David Pfister, Zürich, CH;
Giuseppe Storti, Zürich, CH;
Massimo Morbidelli, Zürich, CH;
Sulzer Chemtech AG, Winterthur, CH;
Abstract
A process to prepare a cyclic polyester oligomer composition having a cyclic polyester oligomer having furanic units, includes the step of reacting a monomer component, for example, 2,5-furan dicarboxylic acid and, for example, ethylene glycol, in a ring closing oligomerization at a reaction temperature and reaction time, for example, at 100° C. to 350° C. for 30 to 600 minutes to obtain a cyclic polyester oligomer having furanic units. The process yields a cyclic polyester oligomer composition which can be used in further ring-opening polymerization reactions to produce a polyester polymer. The cyclic polyester oligomer composition has a cyclic polyester oligomer having furanic units and less than 5% linear oligomeric polyester species in the composition.