Title:
OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2003/100480
Kind Code:
A1
Abstract:
An optical film having a transparent polymer film (b) and, laminated thereon, a birefringent layer (a) formed from a polymer, wherein the birefringent layer (a) and the transparent polymer film (b) satisfy the following formula (1): &Dgr n(a) > &Dgr n(b) × 10 , wherein the birefringent layer (a) satisfies the following formula (2) : 1 < (nx - nz)/ (nx - ny) and formula (3) : 0.0005 ≤ &Dgr n(a) ≤ 0.5, and wherein the polymer constituting the birefringent layer (a) has a weight average molecular weight in the range of 10,000 to 400,000. The optical film allows the suppression of the occurrence of rainbow unevenness, the occurrence of cracks and the occurrence of variations in phase difference.
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Inventors:
MURAKAMI NAO (JP)
NISHIKOUJI YUUICHI (JP)
HAYASHI MASAKI (JP)
YOSHIMI HIROYUKI (JP)
NISHIKOUJI YUUICHI (JP)
HAYASHI MASAKI (JP)
YOSHIMI HIROYUKI (JP)
Application Number:
PCT/JP2003/006322
Publication Date:
December 04, 2003
Filing Date:
May 21, 2003
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
MURAKAMI NAO (JP)
NISHIKOUJI YUUICHI (JP)
HAYASHI MASAKI (JP)
YOSHIMI HIROYUKI (JP)
MURAKAMI NAO (JP)
NISHIKOUJI YUUICHI (JP)
HAYASHI MASAKI (JP)
YOSHIMI HIROYUKI (JP)
International Classes:
B32B27/08; G02B5/30; (IPC1-7): G02B5/30; B32B7/02; B32B27/08; C08J5/18; G02F1/3363
Foreign References:
| JPH06130228A | 1994-05-13 | |||
| JPH10153708A | 1998-06-09 | |||
| JP2001337201A | 2001-12-07 |
Attorney, Agent or Firm:
IKEUCHI SATO & PARTNER PATENT ATTORNEYS (OAP TOWER 8-30, Tenmabashi 1-chome, Kita-k, Osaka-shi Osaka, JP)
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