Konica Corporation

Konica Minolta Opto, Inc.

Atsuko Matsuda

Narito Goto

Tsutomu Kenpo

Rumiko Yamada

Tsutomu Kempo

Provided is a method for producing an optical film which suffers neither flatness deterioration nor film breakage and is free from problems concerning undulating undulation and partial light leakage. The process for optical film production comprises laminating a cellulose ester resin layer (A) to an acrylic resin layer (B) by coextrusion. The process is characterized in that the cellulose ester resin layer (A) contains 55 to 99 mass % cellulose ester resin and the acrylic resin layer (B) contains 55 to 99 mass % acrylic resin, that the web is conveyed while keeping the layer (A) and the layer (B) in contact with the surface of a first cooling roll and the surface of a second cooling roll, respectively, and that when the surface temperature of the first cooling roll and the surface temperature of the second cooling roll are expressed by Ta (&#xb0; C.) and Tb (&#xb0; C.), respectively, then the Ta (&#xb0; C.) and Tb (&#xb0; C.) satisfy the following relationship (1).(&#x2212;80)&#xb0; C.&#x3c;(&#xb0; C.)&#x3c;(&#x2212;5)&#xb0; C.&#x2003;&#x2003;Relationship (1)

Process for producing optical film, optical film, polarizer, and liquid crystal display

A magnetic recording medium having superior electromagnetic conversion characteristics and travel durability in a well balanced state. The recording medium comprises a non-magnetic support and a plurality of magnetic layers each comprising a ferromagnetic powder and a binder and each of the magnetic layers shows a peak of its loss modulus at a temperature not less than 50.degree. C. and the half-width of the loss modulus-temperature curve showing the peak of loss modulus is not larger than 20.degree. C.; and the temperature of the peak of loss modulas of the outermost magnetic layer provided at the outermost portion among the magnetic layers is higher than that of a magnetic layer other than the outermost magnetic layer.

Magnetic recording medium comprising plural magnetic layers wherein each

A magnetic recording medium having a support and provided thereon a magnetic layer is disclosed. The support of the medium concerned comprises physical properties of:

Magnetic recording medium

A magnetic recording medium containing a specific binder resin is disclosed. The magnetic recording medium comprising a magnetic layer which contains a magnetic powder and a binder, in which the binder comprises a polyurethane resin having an anionic functional group being in a form of intramolecular salt; and the magnetic powder is selected from the group consisting of a ferro-magnetic cobalt-containing iron oxide powder, a ferro-magnetic chromium dioxide powder anad a magnetic metal powder containing iron atoms and aluminum atoms in a portion of from 100:1 to 100:20 in terms of the number of atoms.

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Tokyo, Japan

Atsuko Matsuda