Title:
METHOD FOR PRODUCING POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2022/158235
Kind Code:
A1
Abstract:
The present invention provides a method for producing a polarizing film, said method sequentially comprising, in the following order, a step for subjecting a polyvinyl alcohol resin film to a dyeing process and a stretching process, and a step for bringing an aqueous solvent into contact with the surface of the polyvinyl alcohol resin film. With respect to this method for producing a polarizing film, the ratio of the transmittance of the polyvinyl alcohol resin film after the contact with the aqueous solvent to the transmittance thereof before the contact at the wavelength of λ nm, namely ∆Ts(λ) satisfies the relational expression ∆Ts(415) > ∆Ts(470) > ∆Ts(550).
Inventors:
FUJIMOTO NAOKI (JP)
KOJIMA TADASHI (JP)
GOTO SHUSAKU (JP)
KOJIMA TADASHI (JP)
GOTO SHUSAKU (JP)
Application Number:
PCT/JP2021/047761
Publication Date:
July 28, 2022
Filing Date:
December 23, 2021
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30; B29C55/02; B29C55/06
Domestic Patent References:
| WO2017130585A1 | 2017-08-03 |
Foreign References:
| JP2021004946A | 2021-01-14 | |||
| JP2020073997A | 2020-05-14 |
Attorney, Agent or Firm:
MOMII Takafumi (JP)
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