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. 02, 2016
Filed:
Feb. 28, 2013
Applicant:
Sabic Innovative Plastics Ip B.v., Bergen op Zoom, NL;
Inventors:
Vandita Pai-Paranjape, Evansville, IN (US);
Franklin J. Ehrensbeck, Evansville, IN (US);
James Franklin Hoover, Evansville, IN (US);
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G 64/16 (2006.01); C08G 64/00 (2006.01); C08G 64/04 (2006.01); C08G 64/24 (2006.01); C08G 64/14 (2006.01);
U.S. Cl.
CPC ...
C08G 64/04 (2013.01); C08G 64/14 (2013.01); C08G 64/24 (2013.01);
Abstract
Processes for preparing high purity polycarbonates having high light transmission, low yellowness, and color stability are disclosed herein. High purity starting ingredients are used to form a polycarbonate powder. The polycarbonate powder can be subsequently melt extruded at an optimum shear rate to minimize yellowness and the need to add colorant to overcome the yellowness. The lower amount of colorant increases the light transmission of the resulting polycarbonate resin.