Sumitomo Chemical Company, Limited

Mitsutaka Sase

Nobuyuki Hatanaka

Tadahiro Kobayashi

Akira Yokota

Yoshifumi Komatsu

To provide an optical film excellent in suppression of light leakage in black display. An optical film having at least two phase difference layers and having optical properties represented by the formulae (30) and (31) is provided:&#x2212;2.0&#x2264;*&#x2264;0.5&#x2003;&#x2003;(30)&#x2212;0.5&#x2264;*&#x2264;5.0&#x2003;&#x2003;(31)wherein, a* and b* represent the chromatic coordinate in the L*a*b* color system.

Optical film

To provide an optical film excellent in suppression of light leakage in black display. An optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer has an optical property represented by the formula (3), the second phase difference layer has a thickness of 0.2 &#x3bc;m to 2.0 &#x3bc;m, and further, the optical film has optical properties represented by the formulae (1) and (2):(450)/(550)&#x2266;1.00&#x2003;&#x2003;(1)1.00&#x2266;(650)/(550)&#x2003;&#x2003;(2)nx&#x2248;ny&#x3c;nz&#x2003;&#x2003;(3).

To provide an optical film excellent in suppression of light leakage in black display. An optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer has an optical property represented by the formula (3) and the optical film has optical properties represented by the formulae (1), (2) and (30):(450)/(550)&#x2266;1.00&#x2003;&#x2003;(1)1.00&#x2266;(650)/(550)&#x2003;&#x2003;(2)&#x2003;&#x2003;(3)0.001&#x3c;|(550)/(550)|&#x3c;0.2&#x2003;&#x2003;(30).

Optical Film

Optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer having an optical property represented by the formula (3), and the optical film has optical properties represented by the formula (1) and the formula (2). Re(450)/Re(550)&#x2266;1.00(1)1.00&#x2266;Re(650)/Re(550)(2)nx&#x2248;ny&#x3c;nz(3), wherein, Re(450) represents the in-plane phase difference value at a wavelength of 450 nm, Re(550) represents the in-plane phase difference value at a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value at a wavelength of 650 nm, nx represents the principal refractive index in a direction parallel to the film plane, ny represents the refractive index in a direction parallel to the film plane and orthogonally-crossing the direction of nx, nz represents the refractive index in a direction vertical to the film plane, in an index ellipsoid formed by the phase difference layer.

A production method for producing a thin circularly polarizing plate at a high productivity is provided.

Method for producing long circular polarization plate and long circular polarization plate

A method for producing a long retardation film having an optical axis in an oblique direction relative to the length direction of the long retardation film is provided.

Method for producing long retardation film

To provide an elliptical polarization plate excellent in suppression of coloration and light leakage in display. An elliptical polarization plate having a transparent protective film pasted to one surface of a polarizer and an optically anisotropic film pasted to the other surface thereof, wherein, when measured under condition of incident polarization in the film normal direction from the side of the transparent protective film, the visibility corrected single body transmittance is 43.0% or more, the visibility corrected polarization degree is 95.0% or more, the single body hue value a* is &#x2212;2.0 to 1.0 and the single body hue value b* is &#x2212;1.0 to 5.0, and the optically anisotropic film satisfies the formulae (1), (2) and (3):(450)/(550)&#x2266;1.00&#x2003;&#x2003;(1)1.00&#x2266;(650)/(550)&#x2003;&#x2003;(2)100&#x3c;(550)&#x3c;160&#x2003;&#x2003;(3).

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Niihama, Japan

Mitsutaka Sase