Title:
OPTICAL FILM AND POLARIZING PLATE
Document Type and Number:
WIPO Patent Application WO/2023/090353
Kind Code:
A1
Abstract:
There has been a demand for an optical film having excellent glass-range photoelastic coefficient and a polarizing plate which uses this optical film. The present invention provides an optical film which is characterized by containing an ester resin that contains 50% by mole or more of a fumaric acid ester residue unit represented by formula (1) and having a negative birefringence, and a photoelasticity regulator having a positive birefringence, and which is also characterized in that the absolute value of the glass-range photoelastic coefficient thereof is 5 × 10-12 Pa-1 or less. (In the formula, each of R1 and R2 independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, or a cyclic alkyl group having 3 to 6 carbon atoms.)
Inventors:
KOMINE TAKUYA (JP)
YOSHIMURA ASUKA (JP)
KITAGAWA TAKAHIRO (JP)
YOSHIMURA ASUKA (JP)
KITAGAWA TAKAHIRO (JP)
Application Number:
PCT/JP2022/042519
Publication Date:
May 25, 2023
Filing Date:
November 16, 2022
Export Citation:
Assignee:
TOSOH CORP (JP)
International Classes:
G02B5/30; C08F22/14; C08J5/18; G02F1/13363
Foreign References:
| JP2008112141A | 2008-05-15 | |||
| JP2006162748A | 2006-06-22 | |||
| JP2011107281A | 2011-06-02 | |||
| US20100043879A1 | 2010-02-25 |
Attorney, Agent or Firm:
SEKIGUCHI Masao et al. (JP)
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