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:
Jul. 16, 2013
Filed:
Nov. 27, 2012
Shingo Namiki, Fukuoka, JP;
Masanori Yamamoto, Fukuoka, JP;
Shingo Namiki, Fukuoka, JP;
Masanori Yamamoto, Fukuoka, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A polycarbonate resin which is excellent in terms of optical properties, hue, thermal stability, and mechanical properties and a transparent film formed from the resin are provided. The invention relates to a polycarbonate resin which has a glass transition temperature of 110-150° C. and a reduced viscosity, as measured at 20° C. with respect to the methylene chloride solution having a concentration of 0.6 g/dL, of 0.30-0.46, and which, when being molded, gives a film wherein the ratio of the retardation thereof measured at a wavelength of 450 nm (Re450) to the retardation thereof measured at a wavelength of 550 nm (Re550) is 0.50-0.93.