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:
Sep. 08, 2015
Filed:
Apr. 04, 2011
Tadahiro Sunaga, Yamato, JP;
Takashi Oda, Ichihara, JP;
Hirofumi Io, Yokohama, JP;
Keisuke Kawashima, Ichihara, JP;
Yasuhiro Koike, Yokohama, JP;
Tadahiro Sunaga, Yamato, JP;
Takashi Oda, Ichihara, JP;
Hirofumi Io, Yokohama, JP;
Keisuke Kawashima, Ichihara, JP;
Yasuhiro Koike, Yokohama, JP;
MITSUI CHEMICALS, INC., Tokyo, JP;
YASUHIRO KOIKE, Kanagawa, JP;
Abstract
Disclosed is an optical material including a cyclic olefin copolymer containing at least a repeating structural unit [A] represented by the general formula (1) and a repeating structural unit [B] represented by the general formula (2) and having a molar ratio [A]/[B] of from 95/5 to 1/99, wherein the absolute value of the ratio ΔOB/ΔF is from 0.001 to 0.250 in which ΔOB represents the amount of a change in the absolute value of the orientation birefringence calculated from the phase difference (nm) at a wavelength of 633 nm/film thickness (μm) in a stretched film obtained from the optical material, and ΔF represents the amount of a change in the absolute value of the orientation coefficient determined from the dichroic ratio of parallel light intensity Ito perpendicular light intensity I, each relative to the orientation direction according to Raman spectroscopy.