Title:
POLY(VINYL ALCOHOL) FILM AND METHOD FOR PRODUCING POLY(VINYL ALCOHOL) FILM
Document Type and Number:
WIPO Patent Application WO/2023/171710
Kind Code:
A1
Abstract:
A poly(vinyl alcohol) film comprising poly(vinyl alcohol) having a degree of saponification of 98 mol% or higher and a degree of polymerization of 1,500-8,000, characterized in that the poly(vinyl alcohol), when having an absolute molecular weight of 1×106, has an intrinsic viscosity of 7.5-11 dl/g, which is determined with a gel permeation chromatograph equipped with a light scattering detector and a viscometer at a temperature of 40°C using hexafluoroisopropanol containing 20-mM sodium trifluoroacetate as a mobile phase solvent. Such poly(vinyl alcohol) film has a stable film width, fluctuates little in edge thickness, and has excellent stretchability. With this PVA film, it is hence possible to efficiently produce a polarizing film having a wide width and excellent optical performance.
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Inventors:
KAZETO OSAMU (JP)
OKAMOTO MINORU (JP)
OKAMOTO MINORU (JP)
Application Number:
PCT/JP2023/008824
Publication Date:
September 14, 2023
Filing Date:
March 08, 2023
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08F8/12; C08F8/28; C08F16/06; C08F216/06; C08J5/18; C08J7/00; C08L29/04; G02B5/30; G02F1/1335
Domestic Patent References:
| WO2014192838A1 | 2014-12-04 | |||
| WO2015019452A1 | 2015-02-12 | |||
| WO2012077663A1 | 2012-06-14 | |||
| WO2022145487A1 | 2022-07-07 | |||
| WO2022145488A1 | 2022-07-07 |
Foreign References:
| JP2015203088A | 2015-11-16 |
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
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