Sumitomo Chemical Company, Limited

Komatsu Corporation

Akira Yokota

Nobuyuki Hatanaka

Tadahiro Kobayashi

Yoshifumi Komatsu

Mitsutaka Sase

Hiroshi Nakamura

Yasuhiro Hirano

Shigeki Naitoh

Masatsugu Akiba

Yuji Yoshida

Nobuyuki Nakajima

Hyuncheol Choi

Tatsuaki Kasai

Sadanobu Iwase

Method for producing a thin optical laminated body. This method is a method for producing a laminated body including a polarization layer, a &#x3bb;/2 layer, a &#x3bb;/4 layer, a positive C layer, and a transfer adhesive layer, the laminated body including the polarization layer, the &#x3bb;/2 layer and the &#x3bb;/4 layer in this member-described order; including the positive C layer between the polarization layer and the &#x3bb;/4 layer, or at the side of the &#x3bb;/4 layer that is opposite to the &#x3bb;/2-layer-arranged side of the &#x3bb;/4 layer; and including the transfer adhesive layer between the polarization layer and the &#x3bb;/4 layer or positive C layer, the method including the step of bonding a bonding body including a substrate and the transfer adhesive layer to an adherend through the transfer adhesive layer, and peeling the substrate from the resultant.

Method for producing laminated body

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.

Provided is an optically anisotropic sheet that gives a thin optically anisotropic film that can be transferred to a display device. The optically anisotropic sheet includes a substrate, a liquid crystal cured film, and a sticky adhesive layer in this order. The liquid crystal cured film is a film that has a thickness of 5 &#x3bc;m or less and is cured with a polymerizable liquid crystal compound aligned. The sticking force (F1) between the liquid crystal cured film and the sticky adhesive layer is greater than the substrate sticking force (F4).

Optically anisotropic sheet

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).

Elliptical polarization plate

Provided is an epoxy resin having glycidylamino group, wherein the content of hydrolyzable chlorine is 1000 ppm or less. The epoxy resin is useful for adhesives, paints and electric/electronic materials(e.g. insulation materials, laminated plate, etc.).

Highly purified epoxy resin

Polyether and its production method

A polyether copolymer comprising (A) an aromatic polyether block and (B) an aliphatic polyether block is provided.

Polyether copolymer

Polyether resin and coating solution for forming insulation film

Provided is a novolak epoxy resin having a GPC area percentage of a binuclear compound of 15% or more. Said novolak epoxy resin has a low viscosity and is useful for an electric and electronic material such as adhesives, paints, insulating materials, laminates and the like.

Epoxy resin and resin-sealed type semiconductor apparatus

The stilbene epoxy resin having two different aryl groups and an epoxy resin mixture including this stilbene epoxy resin have lower melting points than those of the stilbene epoxy resin having two identical aryl groups and the epoxy resin mixture of the latter stilbene epoxy resin. Compared with the conventional resins, the present resin or resin mixture has improved working and molding properties, which shortens the time required for the molding and working process, resulting in economic advantages and a preferred affect on productivity. The present epoxy resin or resin mixture is preferably used as an adhesive, a coating, an insulating material, an electrical or electronic material for laminated sheets or the like. It is especially suited for use as material for encapsulating electronic parts.

Epoxy resin, resin composition, and resin-encapsulated semiconductor

The stilbene epoxy resin having two different aryl groups and an epoxy resin mixture including this stilbene epoxy resin have lower melting points than those of the stilbene epoxy resin having two identical aryl groups and the epoxy resin mixture of the latter stilbene epoxy resin. Compared with the conventional resins, the present resin or resin mixture has improved working and molding properties, which. shortens the time required for the molding and working process, resulting in economic advantages and a preferred affect on productivity. The present epoxy resin or resin mixture is preferably used as an adhesive, a coating, an insulating material, an electrical or electronic material for laminated sheets or the like. It is especially suited for use as material for encapsulating electronic parts.

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Osaka, Japan

Akira Yokota