Title:
POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2021/206073
Kind Code:
A1
Abstract:
A polarizing member formed by adhering a transparent protective film or an optical functional film to at least one surface of a polarizing membrane, wherein: the polarizing membrane is formed by adsorbing and aligning iodine on a polyvinyl alcohol film; the iodine concentration greater than 10 wt%; the transparent protective film or the optical functional film is a first film that has a water vapor permeability of at most 200 g/(m2∙24 h); the polarizing film has a single transmittance of at most 41%; and the polarizing film satisfies the condition that the change (∆Ts) in single transmittance represented by general formula (1) (∆Ts(%) = Ts96 – Ts0) is 0-5%. In the polarizing film, the initial single transmittance of the polarization membrane having a large iodine content is at most 41%, and the film excels in suppressing decreases in the single transmittance due to coloring of the polarizing film in high-temperature environments, and also excels in suppressing decreases in the degree of polarization in high-temperature, high-humidity environments (wetting durability).
Inventors:
SAWADA HIROAKI (JP)
YAMASHITA TOMOHIRO (JP)
YAMASHITA TOMOHIRO (JP)
Application Number:
PCT/JP2021/014574
Publication Date:
October 14, 2021
Filing Date:
April 06, 2021
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30
Domestic Patent References:
| WO2018235461A1 | 2018-12-27 | |||
| WO2019103002A1 | 2019-05-31 | |||
| WO2020066125A1 | 2020-04-02 | |||
| WO2021039784A1 | 2021-03-04 | |||
| WO2020100861A1 | 2020-05-22 | |||
| WO2020100869A1 | 2020-05-22 | |||
| WO2020184587A1 | 2020-09-17 | |||
| WO2015163224A1 | 2015-10-29 |
Foreign References:
| JP2019053291A | 2019-04-04 | |||
| JP2015180921A | 2015-10-15 | |||
| JP6695014B1 | 2020-05-20 | |||
| JP2019152862A | 2019-09-12 |
Attorney, Agent or Firm:
UNIUS PATENT ATTORNEYS OFFICE (JP)
Download PDF: