Fujifilm Corporation

Fuji Photo Film Company, Limited

Nissan Motor Company Limited

Tomohiro Ichikawa

Mikio Ohno

Tatsuo Ishikawa

Naoto Murao

Katsumi Araki

Shinji Tsujimoto

Kazufumi Omura

Hiroaki Araki

Setsuo Nakamura

Masahide Sato

Kimihiro Nishimura

Tadahiro Ooishi

Takeshi Yanagisawa

An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130&#xb0; C. and a storage elastic modulus at 80&#xb0; C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100&#xb0; C.

Magnetic recording medium and method of manufacturing the same

An aspect of the present invention relates to a magnetic tape comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition. The nonmagnetic layer has a thickness ranging from 0.5 to 1.3 &#x3bc;m. The relation between the nonmagnetic powder and the binder component contained in the radiation-curable composition satisfies equation (I):480&#x2266;(BET specific surface area of the nonmagnetic powder (m/g)&#xd7;weight of the nonmagnetic powder (g))/weight of the binder component (g)&#x2266;650&#x2003;&#x2003;(I).

Magnetic tape and method of manufacturing the same

A cleaning tape comprising a support and a coating layer containing powder and a binder, wherein a surface of the coating layer has a central line average roughness of from 5 to 25 nm and has protrusions having height of 25 nm or more in number of from 60 to 1,700/10&#x3bc;m, the surface of the coating layer being a surface of the cleaning tape.

Cleaning tape for cleaning a magnetic head

A magnetic recording tape comprising a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the nonmagnetic support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, and a distance between an apex of a maximum convexity and a valley of a maximum concavity of the nonmagnetic support on a cross section of an edge of the tape made by cutting the tape in a transverse direction is 2 &#x3bc;m or less in the transverse direction.

Magnetic recording tape

A magnetic recording medium comprising: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a back coat layer, in this order, wherein the nonmagnetic support contains polyester having an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, a surface of the magnetic layer on a side not having the nonmagnetic support has a surface roughness Ra of from 1 to 5 nm, and a surface of the back coat layer on a side not having the nonmagnetic support has a surface roughness Ra of from 6 to 20 nm.

Magnetic recording medium

A magnetic recording medium for being used in a write/read system in which a difference of track width between write track width and read track width is smaller than 10 &#x3bc;m, which comprises: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a backcoating layer, in this order, at least one of the magnetic layer and the backcoating layer having servo signals for tracking control pre-recorded therein, wherein the nonmagnetic support is a film of a polyester having an intrinsic viscosity of 0.40 to 0.60 dl/g and a number average molecular weight of 12000 to 24000.

Provided is a magnetic recording medium affording good head contact and high output in addition to excellent head abrasion characteristics acceptable to high data transmission rates. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a support. Said magnetic layer comprises an abrasive in a quantity of 2 to 5 weight percent with respect to the ferromagnetic powder, the number of protrusions having a height of 3 to 7 nm per 23,000 &#x3bc;mof a surface of the magnetic layer, measured by a non-contact three-dimensional structure analyzing microscope, ranges from 50 to 200, and said magnetic layer has a microindentation hardness ranging from 40 to 80 kg/mmat a load of 6 mgf.

Method and apparatus of assembling vehicular body

A 2 reel type data storage magnetic tape cassette ( ) is provided with reels ( ) around which a magnetic recording medium ( ) is wound. The magnetic recording medium ( ) includes a support, a non-magnetic layer comprising a non-magnetic powder and a binder on one surface of the support, a magnetic layer comprising a ferromagnetic metal powder and a binder on top of the non-magnetic layer, and a back layer comprising a carbon black powder and a binder on the other side of the support. The magnetic tape cassette ( ) is further provided with a rotating guide roller ( ) made of a resin within the cassette ( ). The rotating guide roller ( ) has a ten-point average roughness Rz of 3.0 to 4.5 &mgr;m and is in contact with the surface of the magnetic layer having a center plane average roughness SRa of 2.0 to 3.5 nm.

Growing community of inventors

Kanagawa, Japan

Tomohiro Ichikawa