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:
May. 13, 2014
Filed:
Apr. 03, 2008
Toshiyuki Iida, Ibaraki, JP;
Yutaka Ohmori, Ibaraki, JP;
Miyuki Kurogi, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki-shi, JP;
Abstract
The present invention provides an optical film exhibiting wavelength dispersion such that a retardation value is smaller on the shorter wavelength side, and capable of being also formed comparatively thinly. The optical film of the present invention is an optical film including a polyimide-based polymer represented by the following general formula (I). In the formula (I), m is 40% by mol or more and 100% by mol or less. Rand Reach independently denote a substituent having a carbon-carbon double bond or a triple bond. A, A', B, B′, E, G, and H each denote a substituent, and small letters corresponding to these alphabets denote substitution number thereof. X and Y each independently denote bond part such as a covalent bond. The substituents having a carbon-carbon double bond or a triple bond represented by Rand Rare a substituted or unsubstituted aryl group, a substituted or unsubstituted vinyl group, and a substituted or unsubstituted ethynyl group.