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Title:
POLARIZING FILM AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/146678
Kind Code:
A1
Abstract:
A polarizing film including polyvinyl alcohol (A), at least one species of boron-containing compound (B) selected from the group consisting of diboronic acids represented by formula (I) and compounds that can be transformed to such a diboronic acid in the presence of water, and boric acid (C), wherein the concentration (α) of elemental boron originating from the boron-containing compound (B) in a range of 1 µm toward the inside of the polarizing film from the surface thereof is 1-7 atom %, the concentration (β) of elemental boron originating from the boron-containing compound (B) in a range of 1 µm toward the outside from the center of the polarizing film is 0.1-2 atom%, and the ratio (α/β) of the concentration (α) to the concentration (β) is 1.5 or greater. The polarizing film has good polarizing performance and hue, as well as low contractile force. [In formula (I), R1 is a C1-20 divalent organic group, and R1 and the two boric acid groups are linked by boron-carbon bonds.]

Inventors:
OHASHI, Wataru (7471, Tamashimaotoshima, Kurashiki-sh, Okayama 50, 〒7138550, JP)
ISOZAKI, Takanori (7471, Tamashimaotoshima, Kurashiki-sh, Okayama 50, 〒7138550, JP)
Application Number:
JP2019/002223
Publication Date:
August 01, 2019
Filing Date:
January 24, 2019
Export Citation:
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Assignee:
KURARAY CO., LTD. (1621, Sakazu Kurashiki-sh, Okayama 01, 〒7100801, JP)
International Classes:
G02B5/30; B29C55/04; C08K5/55; C08K5/56; C08L29/04; B29K29/00; B29L7/00; B29L11/00; C07F5/02
Domestic Patent References:
WO2018021274A12018-02-01
Foreign References:
KR20140075154A2014-06-19
KR20150052777A2015-05-14
JP2018180022A2018-11-15
JP2019015926A2019-01-31
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (Growth-2 Building, 4-9-1 Ima, Kita-ku, Okayama-sh, Okayama 75, 〒7000975, JP)
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