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. 29, 2002
Filed:
Nov. 12, 1999
Applicant:
Inventors:
Thomas Michael Pell, Jr., Kingsport, TN (US);
Michael Paul Ekart, Wassenaar, NL;
David Dunlap Cornell, Kingsport, TN (US);
Damon Brian Shackelford, Johnson City, TN (US);
Donald Lee Carver, Church Hill, TN (US);
Assignee:
Eastman Chemical Company, Kingsport, TN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 5/100 ; C07C 6/748 ; C07C 6/700 ;
U.S. Cl.
CPC ...
C07C 5/100 ; C07C 6/748 ; C07C 6/700 ;
Abstract
A process for producing high quality TPA suitable for PET feedstock material from recycled polyester. The process includes the steps of depolymerizing the polyester to form DMT; separating the DMT from secondary materials; and hydrolyzing the DMT to form TPA. In a preferred embodiment of the invention the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester prior to depolymerizing the polyester.