Title:
METHOD FOR MANUFACTURING POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2011/162259
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a polarizing film, which has steps in which a polyvinyl alcohol based film (1) is sequentially subjected to swelling treatment, dyeing treatment, boric acid treatment, and cleaning treatment, and the polyvinyl alcohol based film (1) is uniaxially stretched before or during any one of said steps by using the circumferential speed difference between two nip rolls (2, 2'), wherein the method for manufacturing a polarizing film has a step in which at least one wide roll (3) is disposed between the two nip rolls (2, 2') to perform widening and uniaxial stretching. The accumulated draw ratio until the widening step (including the widening step) is equal to or greater than 1.6 (the draw ratio of the widening step when no other stretching step is performed before the widening step). In the widening step, the angle between the widening direction of the wide roll (3) and the carry-out direction of the film (1) carried out from the wide roll (3) is -40° to 70° (if the direction in which the film travels is viewed from left to right, the carry-out direction of the film from the wide roll is 0°, and clockwise angles from the carry-out direction are negative (-) and counterclockwise angles are positive (+)).
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Inventors:
AMITANI, Keiji (2-3 Ikku-cho, Niihama-shi Ehime, 25, 〒7920025, JP)
網谷 圭二 (〒25 愛媛県新居浜市一宮町２－３ Ehime, 〒7920025, JP)
KWON, Yong Hyun (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
權 容鉉 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
CHUNG, Min Jae (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
丁 民載 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
網谷 圭二 (〒25 愛媛県新居浜市一宮町２－３ Ehime, 〒7920025, JP)
KWON, Yong Hyun (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
權 容鉉 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
CHUNG, Min Jae (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
丁 民載 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
Application Number:
JP2011/064169
Publication Date:
December 29, 2011
Filing Date:
June 21, 2011
Export Citation:
Assignee:
SUMITOMO CHEMICAL COMPANY, LIMITED (27-1, Shinkawa 2-chome Chuo-k, Tokyo 60, 〒1048260, JP)
住友化学株式会社 (〒60 東京都中央区新川二丁目２７番１号 Tokyo, 〒1048260, JP)
DONGWOO FINE-CHEM CO., LTD. (740-30, Shinheung-dong Iksan-s, Jeollabuk-do 0, 570140, KR)
東友ファインケム株式会社 (5 全羅北道益山市新興洞７４０－３０ Jeollabuk-do, 570140, KR)
AMITANI, Keiji (2-3 Ikku-cho, Niihama-shi Ehime, 25, 〒7920025, JP)
網谷 圭二 (〒25 愛媛県新居浜市一宮町２－３ Ehime, 〒7920025, JP)
KWON, Yong Hyun (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
權 容鉉 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
住友化学株式会社 (〒60 東京都中央区新川二丁目２７番１号 Tokyo, 〒1048260, JP)
DONGWOO FINE-CHEM CO., LTD. (740-30, Shinheung-dong Iksan-s, Jeollabuk-do 0, 570140, KR)
東友ファインケム株式会社 (5 全羅北道益山市新興洞７４０－３０ Jeollabuk-do, 570140, KR)
AMITANI, Keiji (2-3 Ikku-cho, Niihama-shi Ehime, 25, 〒7920025, JP)
網谷 圭二 (〒25 愛媛県新居浜市一宮町２－３ Ehime, 〒7920025, JP)
KWON, Yong Hyun (802-8, Shinheung-dong, Iksan-s, Jeollabuk-do 7, 570977, KR)
權 容鉉 (5 全羅北道益山市新興洞８０２－８ 東友ファインケム株式会社内 Jeollabuk-do, 570977, KR)
International Classes:
G02B5/30; B29C55/06; B29L7/00; B29L11/00
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (AOYAMA & PARTNERS, IMP Building 3-7, Shiromi 1-chome, Chuo-ku, Osaka-sh, Osaka 01, 〒5400001, JP)
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Claims: