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:
Oct. 06, 2015
Filed:
Dec. 02, 2011
Hiroyoshi Kiuchi, Hachioji, JP;
Takatugu Suzuki, Hachioji, JP;
Kiyoshi Fukusaka, Fussa, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
The purpose of the present invention is to provide an optical film having a large phase difference value, small moisture-induced fluctuation in the phase difference value, small photoelastic coefficient and excellent bondability with a polarizer. The optical film includes a cellulose ester (A) which satisfy formulae (1) and (2) below and a vinyl-based polymer (B). A content ratio of the cellulose ester (A) and the vinyl-based polymer (B) is from 95:5 to 50:50 by mass, the vinyl-based polymer (B) is composed of a non-aromatic vinyl-based monomer having a solubility parameter of 17.5 (MPa) or larger and smaller than 20.0 (MPa) and a weight average molecular weight of the vinyl-based polymer (B) is from 500 to 10,000: where1.0≦<2.0  formula (1)4.0≦2×+Σ()<6.0.  formula (2)