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Title:
OPTICAL FILM, PRODUCTION METHOD THEREFOR, AND POLARIZING PLATE
Document Type and Number:
WIPO Patent Application WO/2022/145169
Kind Code:
A1
Abstract:
The present invention produces an optical film by means of a production method involving, in the order given, a step for preparing a resin film comprising a resin that includes a crystalline polymer having a negative intrinsic birefringence and a thermoplastic polymer having a positive intrinsic birefringence, a step for bringing the resin film into contact with a solvent to cause the birefringence of the film in the thickness direction to change, and a step for stretching the resin film.

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Inventors:
INOUE KYOSUKE (JP)
Application Number:
PCT/JP2021/044208
Publication Date:
July 07, 2022
Filing Date:
December 02, 2021
Export Citation:
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Assignee:
ZEON CORP (JP)
International Classes:
G02B5/30; C08F12/08; C08L101/12
Domestic Patent References:
WO2019188205A12019-10-03
Foreign References:
JP2007191505A2007-08-02
JP2003161832A2003-06-06
JP2015157928A2015-09-03
JP2016079377A2016-05-16
US20150042928A12015-02-12
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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