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:
Aug. 25, 2020
Filed:
Oct. 14, 2016
Nitto Denko Corporation, Ibaraki-shi, JP;
Mitsubishi Chemical Corporation, Chiyoda-ku, JP;
Shingo Namiki, Fukuoka, JP;
Yuuichi Hirami, Fukuoka, JP;
Hisatoshi Uehara, Kanagawa, JP;
Hiroyuki Hayashi, Kanagawa, JP;
Takashi Shimizu, Osaka, JP;
Hiroshi Sumimura, Osaka, JP;
Nao Murakami, Osaka, JP;
NITTO DENKO CORPORATION, Ibaraki-shi, JP;
Mitsubishi Chemical Corporation, Chiyoda-ku, JP;
Abstract
An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of Δn≥0.0140×(R450/R550)−0.0082; and a photoelastic coefficient is 25×10Paor less.