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. 05, 2010
Filed:
Oct. 17, 2006
Takahisa Konishi, Ibaraki, JP;
Yutaka Ohmori, Ibaraki, JP;
Hisae Sugihara, Ibaraki, JP;
Miyuki Kurogi, Ibaraki, JP;
Takahisa Konishi, Ibaraki, JP;
Yutaka Ohmori, Ibaraki, JP;
Hisae Sugihara, Ibaraki, JP;
Miyuki Kurogi, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;
Abstract
An optical film containing a polymer having at least a repeating unit represented by following general formula (I): The optical film is excellent in heat resistance, transparency and processability because it contains a polymer having a naphthyl group in a molecular structure. In addition, when a retardation film is produced by drawing the optical film, a composition ratio of the polymer can be adjusted in a specific range so that the retardation film exhibits inverse wavelength dispersion properties such that higher retardation value is offered in measuring by light with longer wavelength. The retardation film having such properties is extremely useful for improving display properties of a liquid crystal display device. The optical film is also used in the production of a polarizing plate.