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:
Feb. 05, 2013
Filed:
Sep. 09, 2009
Yoshiaki Hisakado, Minami-ashigara, JP;
Takuya Inoue, Miniami-ashigara, JP;
Shigeaki Nimura, Minami-ashigara, JP;
Yasuyuki Sasada, Minami-ashigara, JP;
Yoshiaki Hisakado, Minami-ashigara, JP;
Takuya Inoue, Miniami-ashigara, JP;
Shigeaki Nimura, Minami-ashigara, JP;
Yasuyuki Sasada, Minami-ashigara, JP;
FUJIFILM Corporation, Minato-Ku, Tokyo, JP;
Abstract
The present invention relates to an optical film produced by stretching a film having a low residual solvent amount in a machine direction followed by heat-treating it at a temperature falling from the glass transition point (Tg) to the melting point (Tm) thereof, which is a cellulose acylate film satisfying the following relations (1) to (6) and containing at least one cellulose acylate and at least one retardation enhancer having an absorption maximum wavelength λmax of from 280 nm to 380 nm: (1) 35 nm≦Re(550)≦75 nm, (2) 85 nm≦Rth(550)≦140 nm, (3) 0 nm<ΔRe(630−450)≦40 nm, (4) −75 nm≦ΔRth(630−450)<0 nm, (5) 2.7≦A+B≦3.0, and (6) B≧0, wherein 'A' means a degree of substitution with an acetyl group of said at least one cellulose acylate, and 'B' means a degree of substitution with an acyl group having at least 3 carbon atoms thereof.