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:
Feb. 15, 2005
Filed:
May. 20, 2004
Applicants:
John H. Clements, Round Rock, TX (US);
Howard P. Klein, Austin, TX (US);
Kenneth M. Hillman, Georgetown, TX (US);
Inventors:
John H. Clements, Round Rock, TX (US);
Howard P. Klein, Austin, TX (US);
Kenneth M. Hillman, Georgetown, TX (US);
Assignee:
Huntsman Petrochemical Corporation, Austin, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G064/00 ;
U.S. Cl.
CPC ...
Abstract
The present invention provides a process for producing polycarbonates in the presence of one or more alkali metal or alkaline-earth metal catalysts, and subsequently removing the catalyst residues by chelation, to yield a clear polycarbonate product that is free from catalyst residues, and is thus suitable for use as a binding material in the ceramics industry where residual amounts of catalysts in the binder are burdensome.