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. 26, 2014
Filed:
Nov. 10, 2011
Applicants:
Tetsuya Motoyoshi, Chiyoda-ku, JP;
Masatoshi Ando, Chiyoda-ku, JP;
Tsuyoshi Takeda, Chiyoda-ku, JP;
Inventors:
Assignee:
Teijin Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/02 (2006.01); G02B 1/04 (2006.01); C08G 64/16 (2006.01); C08G 63/00 (2006.01);
U.S. Cl.
CPC ...
C08G 64/1608 (2013.01); G02B 1/04 (2013.01); C08G 64/1616 (2013.01);
Abstract
The present invention provides a copolycarbonate that has a low photoelastic constant and has fewer foamed cells and that is in particular suitable for use in optical fields. The present invention is a copolycarbonate containing 10 to 90 mol % of a unit (A) derived from spiroglycol and 90 to 10 mol % of a unit (B) derived from aromatic phenol and having terminals satisfying the following expressions (i) and (ii),0.0001<()/()<0.1  (i)0.02<()/()<0.8  (ii)