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1. (WO1998022839) PHASE DIFFERENCE FILM AND ITS MANUFACTURING METHOD
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1998/022839    International Application No.:    PCT/JP1997/004185
Publication Date: 28.05.1998 International Filing Date: 17.11.1997
Chapter 2 Demand Filed:    01.06.1998    
IPC:
B29D 7/01 (2006.01), G02B 5/30 (2006.01), G02F 1/13363 (2006.01)
Applicants: SEKISUI CHEMICAL CO., LTD. [JP/JP]; 4-4, Nishitemma 2-chome, Kita-ku, Osaka-shi, Osaka 530 (JP) (For All Designated States Except US).
MIURA, Akihisa [JP/JP]; (JP) (For US Only).
OKADA, Yasumasa [JP/JP]; (JP) (For US Only).
TSUBOI, Kotaro [JP/JP]; (JP) (For US Only).
KOBAYASHI, Hitoshi [JP/JP]; (JP) (For US Only).
ABE, Hiroyuki [JP/JP]; (JP) (For US Only).
UENOMACHI, Kiyomi [JP/JP]; (JP) (For US Only)
Inventors: MIURA, Akihisa; (JP).
OKADA, Yasumasa; (JP).
TSUBOI, Kotaro; (JP).
KOBAYASHI, Hitoshi; (JP).
ABE, Hiroyuki; (JP).
UENOMACHI, Kiyomi; (JP)
Agent: MIYAZAKI, Chikara; Nishimura Building, 6-5, Tanimachi 1-chome, Chuo-ku, Osaka-shi, Osaka 540 (JP)
Priority Data:
8/311818 22.11.1996 JP
8/313734 25.11.1996 JP
9/131234 21.05.1997 JP
Title (EN) PHASE DIFFERENCE FILM AND ITS MANUFACTURING METHOD
(FR) FILM DE DEPHASAGE ET SON PROCEDE DE FABRICATION
Abstract: front page image
(EN)A phase difference film which has little unevenness of phase difference in in-plane directions and the manufacturing method of the phase difference film are disclosed. A phase difference film whose in-plane direction refractive index difference at its surface is larger than its in-plane direction refractive index difference at the center of its thickness direction. In the manufacturing method of the phase difference film where a raw film which is produced by a solvent casting method or an extrusion film forming method is stretched, volatile components in the film are volatilized at least in one of the processes from the film forming process to the stretching process to make the in-plane direction refractive index difference in its surface larger than its in-plane direction refractive index difference at the center of its thickness direction.
(FR)Cette invention se rapporte à un film de déphasage qui possède peu d'inégalité de déphasage dans les directions en plan, ainsi qu'au procédé de fabrication de ce film de déphasage. Ce film de déphasage possède une différence d'indice de réfraction dans la direction en plan qui est plus grande à sa surface qu'au centre de son épaisseur. Dans le procédé de fabrication de ce film de déphasage, on étire un film brut, lequel est produit par un procédé de coulage par solvant ou par un procédé de formage de film par extrusion, on laisse les constituants volatils des films se volatiliser au moins dans l'une des étapes entre le processus de formation du film et le processus d'étirement, pour rendre la différence d'indice de réfraction dans la direction en plan plus grande à sa surface qu'au centre de son épaisseur.
Designated States: CN, KR, US.
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)