Fuji Photo Film Company, Limited

Toshimitu Okutu

Masaaki Fujiyama

Takahito Miyoshi

Kenichi Masuyama

Masahiro Utumi

Nobutaka Yamaguchi

Goro Akashi

Katsumi Ryoke

Eiichi Tadokoro

Shinobu Iida

Norio Nasu

Nobuo Aoki

Yasuyuki Yamada

Masatoshi Takahashi

Nobuo Tsuji

Fumiyuki Suzuki

Yasutoshi Okuzawa

Yutaka Kakuishi

Hiroshi Ogawa

Tatsuji Kitamoto

Kiyokazu Hashimoto

Takashi Yoneyama

Akira Kasuga

Noburo Hibino

Masami Sato

Sumitaka Tatsuta

Masaaki Takimoto

Akira Ushimaru

Hideaki Kosha

Masaaki Otoshi

Sugihiko Tada

Minoru Kanazawa

Takashi Saida

Shin-Ichiro Dezawa

Masahiro Utsumi

Keitaro Ohe

A polyester support is described, which has a tear strength in the transverse direction (TD) of 10 to 100 g, a break strength in TD of 10 to 40 Kg/mm,, a break strength in the machine direction (MD) of 2 to 25 Kg/mm,and a thickness unevenness in MD of 0 to 8 &mgr;m. Also described is a silver halide photographic light-sensitive material using the support.

Polyester support and silver halide photographic light-sensitive material

A photographic support having good adhesion to a photographic emulsion layer formed thereon without physical surface modification. The support comprises a uniaxially or biaxially stretched polyester film and has at least (1) a main layer containing a polyester and (2) one or two surface layers. At least one of the surface layers comprises a substantially noncrystalline polyester. Furthermore, when used in the form of a roll film, substantially no curling of the support remains upon development.

Photographic support

A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, said binder of the magnetic layer containing polyisocyanato-isocyanurate as a hardening component.

Magnetic recording medium

A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic fine particles, a binder, and .alpha.-alumina particles having an average size of from about 0.1 to 0.3 .mu.m, provided that the number of .alpha.-alumina particles having a particle size of larger than 0.05 .mu.m is at least equal to the number of .alpha.-alumina particles having a particle size of up to 0.05 .mu.m.

In a magnetic recording medium comprising a nonmagnetic support, a magnetic recording layer provided on one surface of said support and a back layer containing carbon black provided on another surface of said support, the improvement wherein said back layer has thickness of not larger than 0.6 .mu.m and contains an inorganic filler powder having a Mohs' scale of hardness of not less than 5, a mean particle diameter of smaller than the thickness of the back layer and not smaller than 1/5 of the thickness thereof, and the maximum particle diameter of not larger than 11/10 of the thickness of the back layer.

A process for the preparation of a magnetic paint comprising a ferromagnetic powder, an abrasive and a binder, which comprises the steps of preparing the abrasive dispersion comprising the abrasive and the binder, and then mixing said abrasive dispersion and the ferromagnetic powder.

Process for the preparation of magnetic paint

A magnetic recording medium which comprises a non-magnetic support having on the surface side thereof a magnetic recording layer and on the opposite side thereof a backing layer is disclosed. The backing layer contains carbon black and a binder and has a thickness of 2 .mu.m or less. The carbon black is composed of fine-grained carbon black having a mean grain size of 10 to 30 m.mu. and coarse-grained carbon black having a mean grain size of 100 to 150 m.mu.. In the backing layer the ratio of the content of carbon black to the binder ranges from 1:0.5 to 1:3.5 by weight.

A magnetic recording medium comprising a non-magnetic support having coated thereon a magnetic layer, the magnetic layer containing (i) ferromagnetic alloy particles having an average length in the long axis of 0.25 .mu.m or less and (ii) fatty acid components comprising behenic acid in an amount of 20 to 75 wt%, stearic acid in an amount of 10 to 45 wt% and oleic acid in an amount of 10 to 45 wt% based on the total weight of the three fatty acids.

A magnetic recording medium is described, comprising a non-magnetic support having coated thereon on opposite surfaces a magnetic layer containing a magnetic substance and a binder-containing backing layer, wherein the magnetic layer has a light transmittance of 2% or more for light having a wavelength of 900 nm, the backing layer has a transmittance of from 1 to 10% for light having a wavelength of 900 nm, the magnetic recording medium as a whole has a transmittance of 1% or less for light having a wavelength of 900 nm, and the backing layer has a center line average roughness (Ra) of 0.05 .mu.m or less at a cut-off value of 0.08 mm.

A magnetic recording medium including a nonmagnetic support having a magnetic layer on one side thereof and a backing layer on the opposite side thereof, said backing layer comprising a fatty acid having 12 or more carbon atoms and copper or copper ions. Fatty acid is saturated or unsaturated, and copper is 0.2 micron or less in size.

Magnetic recording media

A magnetic recording medium is disclosed which comprises a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 7.times.10.sup.10 to 1.times.10.sup.13 dyn/cm.sup.2.

A magnetic recording material, which comprises a non-magnetic support having provided on one side thereof a magnetic layer and on the other side thereof a backing layer is disclosed. The binder of the backing layer is comprised of a combination of a cellulose resin, a vinylidene chloride resin, a polyurethane resin and a polyisocyanate. Use of the backing layer increases the durability of the tape and aids in preventing drop out.

This invention relates to a magnetic recording medium whose coefficient of friction is lowered without lowering S/N and which has an improved running property, which comprises a magnetic recording layer on one side of a nonmagnetic support and a back layer containing an inorganic powder and a binder and having a thickness of at most 2.mu., on the other side thereof, characterized in that the surface of the back layer is provided with surface projections with a height of 0.05 to 0.8.mu., an interval of at least 50.mu. and 50 to 50,000 projections/cm.sup.2.

A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided on opposite surfaces a magnetic recording layer and a backing layer containing two types of carbon black and a binder and having a thickness of 2 .mu.m or less, one of said carbon black being fine carbon black having an average particle size of 30 to 100 m.mu. and the other of said carbon black being coarse carbon black having an average particle size of 150 to 500 m.mu., and the mixing weight ratio of said carbon black and the binder being 1:1.5 to 1:3.5.

A magnetic recording medium comprising a non-magnetic support, a magnetic layer on a surface of the non-magnetic support, and a backing layer on a reverse surface of the non-magnetic support, composed of powder and a binder, and having a thickness of not more that 2 microns, wherein said powder comprises TiO.sub.2 powder and carbon black powder in the weight ratio of 4:6 to 10:0. The average particle size of TiO.sub.2 powder ranges from 0.01 to 0.8 microns.

Growing community of inventors

Kanagawa, Japan

Toshimitu Okutu