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:
Apr. 15, 2008
Filed:
Nov. 29, 2005
James A. Mahood, Evansville, IN (US);
Emine Elif Gurel, Evansville, IN (US);
James A. Mahood, Evansville, IN (US);
Emine Elif Gurel, Evansville, IN (US);
General Electric Company, Schenectady, NY (US);
Abstract
A copolycarbonate is discloses, comprising units of the formula (1) wherein 70 to 99.5 mole percent of the total number of Rgroups are derived from a dihydroxy compound of formula (2) wherein Rand Rare each independently a halogen or a Calkyl group, Ris a methyl or a phenyl group, and c is independently 0 to 4; and 0.5 to 30 mole percent of the total number of Rgroups are derived from a dihydroxy compound of formula (3)HO—R—OH  (3)wherein at least 60% of the Rgroups are aromatic, and the dihydroxy compound of formula (3) is not the same as the dihydroxy compound of formula (2), and wherein the copolycarbonate has a glass transition temperature of 250° C. or higher.