Title:
POLY(VINYL ALCOHOL) FILM AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/182267
Kind Code:
A1
Abstract:
A poly(vinyl alcohol) film having a degree of swelling (A) of 195-205 mass% and having a value of (B)/(A) of 1.27-1.40, where (B) is the degree of swelling of the film which has been stretched to 2.5 times in 30°C water under the conditions of a stretching rate of 240 %/min. When immersed in 30°C water for 30 seconds, the poly(vinyl alcohol) film has an average water absorption rate of 1.35 mass%/sec or greater. By using such poly(vinyl alcohol) film in polarizing-film production, polarizing films having excellent optical performance can be obtained while diminishing breakages even under high-speed stretching conditions.
Inventors:
ISHIHARA MANA (JP)
TAKATORI YOHEI (JP)
NAKAI SHINJI (JP)
TAKATORI YOHEI (JP)
NAKAI SHINJI (JP)
Application Number:
PCT/JP2023/010856
Publication Date:
September 28, 2023
Filing Date:
March 20, 2023
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08J5/18; B29D7/01; G02B5/30; G02F1/1335
Domestic Patent References:
| WO2019151206A1 | 2019-08-08 | |||
| WO2022202861A1 | 2022-09-29 | |||
| WO2022080472A1 | 2022-04-21 | |||
| WO2018199141A1 | 2018-11-01 | |||
| WO2014050697A1 | 2014-04-03 |
Foreign References:
| JP2017223941A | 2017-12-21 |
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
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