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:
Oct. 09, 2012
Filed:
Jul. 29, 2010
Applicants:
Peter D. Phelps, Schenectady, NY (US);
Gary R. Faler, Schwarzheide, DE;
Inventors:
Peter D. Phelps, Schenectady, NY (US);
Gary R. Faler, Schwarzheide, DE;
Assignee:
Cyclics Corporation, Schenectady, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/02 (2006.01); C08F 6/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention provides methods and systems for manufacturing low-acid polyalkylene terephthalate, for example, polybutylene terephthalate (PBT). The invention also provides methods and systems for preparing macrocyclic polyester oligomer (MPO) from low-acid polyalkylene terephthalate. Finally, the invention provides methods and systems for preparing MPO via reaction of a diol and a dialkyl ester in an organic solvent to form non-isolated, low-acid polyalkylene terephthalate which undergoes cyclization (depolymerization) to form MPO.