Retardation film, method for producing the same, polarizing plate and liquid crystal display
申请人:Inagaki Shinji
公开号:US20070134446A1
公开(公告)日:2007-06-14
A method of producing a long roll retardation film comprising the sequential steps of: (a) casting a film forming material on an endless support to form a long roll film; (b) stretching the long roll film in a lateral direction of the long roll film while both edges of the long roll film are held employing a plurality of clips for each of the edges in a tenter (First Process); (c) reducing distances in the lateral direction between the clips holding the both edges of the long roll film while the edges of the long roll film are held continuously from First Process with the clips (Second Process); (d) enlarging the distances in the lateral direction between the clips holding the both edges of the long roll film while the edges of the long roll film are held continuously from Second Process with the clips (Third Process).
Cellulose acylate film, polarizing plate and liquid crystal display
申请人:Ohtani Sumio
公开号:US20070172605A1
公开(公告)日:2007-07-26
To provide a cellulose acylate film which exhibits excellent retardation values both in the film plane and along the direction perpendicular to the film plane, and undergoes less change in the retardation values by environmental humidity, and a polarizing plate using this film, a polarizing plate using the film, and a liquid crystal display undergoing less change in viewing angle characteristics, the cellulose acylate film satisfies formulae (I), (II), (V) and (VI), wherein Re(630) and Rth(630) is defined in the specification:
2.00≦
DS
2+
DS
3+
DS
6≦3.00 (I)
DS
6/(
DS
2+
DS
3+
DS
6)≧0.315 (II)
46≦
Re
(630)≦200 (V)
70≦
Rth
(630)≦350 (VI)
Optical film and optical compensatory film, polarizing plate and liquid crystal display using same
申请人:Nakayama Hajime
公开号:US20070190268A1
公开(公告)日:2007-08-16
An optical film is provided and contains at least one of a polycarbonate copolymer and a blend containing the polycarbonate copolymer. The polycarbonate copolymer contains specific repeating units. The optical film satisfies the following formulae (1) to (4).
0.1<
Re
(
450
)/
Re
(
50
)<
0.95
(
1
)
1.03<
Re
(
650
)/
Re
(
550
)<
1.93
(
2
)
0.4<
(
Re
(
450
)/
Rth
(
450
))/(
Re
(
550
)/
Rth
(
550
))<
0.95
(
3
)
1.05<
(
Re
(
650
)/
Rth
(
650
))/(
Re
(
550
)/
Rth
(
550
))<
1.90
(
4
)
Resin film, production method thereof, polarizing plate and liquid crystal display device
申请人:Fukagawa Nobutaka
公开号:US20070290168A1
公开(公告)日:2007-12-20
A resin film has a photoelastic coefficient of from 0 to 30×10
−8
cm
2
/N; and Re satisfying the following formulae (1) to (4):
20 nm<
Re
(548)<300 nm : Formula (1)
0.5<
Re
(446)/
Re
(548)<1 : Formula (2)
1.0<
Re
(629)/
Re
(548)<2.0 : Formula (3)
0.1%≦[
Re
(548) at 25° C., 10% RH−
Re
(548) at 25° C., 80% RH}/
Re
(548) at 25° C., 60% RH]≦20%, : Formula (4)
wherein Re(λ) represents an in-plane retardation at a wavelength of λ.