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. 04, 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
The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of Rto Rare the same as in the description).