Fuji Photo Film Company, Limited

International Business Machines Corporation

Akira Ushimaru

Hiroshi Hashimoto

Yasuo Nishikawa

Kazuko Hanai

Masatoshi Takahashi

Toshio Ishida

Hiroyuki Kobayashi

Yasuyuki Tanaka

Masaaki Fujiyama

Tsutomu Okita

Takahito Miyoshi

Hiroo Inaba

Akihiro Matsufuji

Tatsuya Yamada

Keiichi Suzuki

Naoyoshi Chino

Shinzo Kishimoto

Toshimitu Okutu

Noburo Hibino

Kyoichi Naruo

Kenichi Masuyama

Hiroaki Araki

Kesanao Kobayashi

Nobuyuki Yamamoto

Hideomi Watanabe

Kazuaki Taga

Yuzo Higaki

Yosuke Nakajima

Toshihiro Ueki

Yoshio Seoka

Yoshiyuki Hoshi

Masayoshi Kawai

Kenichi Yoden

Yuuichirou Murayama

Naoyuki Tsujimura

Kenzo Iwamoto

Kazunori Hasebee

A light-sensitive composition for forming a black matrix comprises (a) a photopolymerizable unsaturated compound, (b) a photopolymerization initiator, (c) a binder and (d) a pigment, wherein the amount of monovalent metallic cations present in the pigment as impurities is not more than 5 ppm; a black matrix is formed from the composition; a color filter substrate comprises a transparent substrate and a color filter formed thereon, wherein it further comprises the foregoing black matrix formed thereon; and a liquid crystal display device comprises an array substrate provided thereon with display electrodes and switching elements, a color filter substrate, common electrodes and a liquid crystal injected in the space between the array substrate and the color filter substrate, wherein it further comprises the foregoing black matrix formed on the switching elements or on the color filter substrate. The black matrix shows desired shading properties without impairing the quality of driving elements even when it is directly formed thereon. Moreover, the surface area of the black matrix can be minimized and the opening of the picture elements can be increased.

Light sensitive composition for black matrix, substrate for color

A magnetic recording medium comprising a subbing layer provided between a nonmagnetic plastic support and at least one of a magnetic layer and a backing layer, the magnetic layer and the backing layer each having a void of 40% by volume or less, and the subbing layer having higher solubility in a 0.5 wt % alkaline aqueous solution at 40.degree. C. than that in water at 40.degree. C. and being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. The subbing layer comprising a polymer containing acidic polar groups, and the subbing layer being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. A process for recovery and processing of a magnetic recording medium, the process comprising the steps of: (1) cutting a magnetic recording medium comprising a nonmagnetic plastic support having thereon a magnetic layer and/or a backing layer each having a void of 40% by volume or less; (2) dipping pieces of the magnetic recording medium in a weak alkali having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less with stirring so that a subbing layer in the pieces having higher solubility in an alkaline aqueous solution than that in water is dissolved therein to peel off the magnetic layer and/or the backing layer from the nonmagnetic plastic support, and (3) separating the magnetic layer and/or the backing layer from the nonmagnetic plastic support.

Magnetic recording medium having specific subbing layers and process for

A magnetic recording medium high in storage stability and excellent in running properties and durability over a wide range of temperature and humidity, which comprises a non-magnetic support having a magnetic layer formed thereon, in which the magnetic recording layer contains a tertiary branched chain fatty acid ester represented by the following general formula ( I ): ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents a hydrocarbon group having 1 to 18 carbon atoms, and R.sup.4 represents a hydrogen group having 1 to 24 carbon atoms, provided the total number of carbon atoms in the ester is 12 to 40.

Magnetic recording medium comprising a magnetic layer having

A magnetic recording medium comprising a non-magnetic support having thereon an undercoating layer and a magnetic layer, wherein the undercoating layer is provided between the non-magnetic support and magnetic layer, and a binder used for the undercoating layer comprises a resin having an elution amount of 0.05 to 0.4 mg/cm.sup.2 when placed in a mixed solvent of methyl ethyl ketone and cyclohexanone having a weight ratio of 1:1 at 25.degree. C. for 30 seconds.

Magnetic recording medium

A magnetic recording medium is provided comprising a non-magnetic support having thereon at least one magnetic layer comprising a ferromagnetic powder, a binder, and at least one of organic silicone compounds represented by formulae (I-1) or (I-2); ##STR1## wherein R represents a branched saturated hydrocarbon group having from 7 to 24 carbon atoms; m represents an integer of from 1 to 100; n represents an integer of from 0 to 250; and m.gtoreq.n/5.

Magnetic recording medium having a magnetic layer comprising

A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon at least one magnetic recording layer comprising a dispersion of ferromagnetic particles in a binder, said binder comprising the combination of a polyisocyanate and a polyurethane binder comprising at least one terminal hydroxyl group at each end of the polyurethane molecule, said polyurethane binder being prepared by reacting (a) a polyurethane prepolymer comprising at least one terminal isocyanate group at each end of the polyurethane prepolymer molecule, said polyurethane prepolymer having a glass transition temperature of at least 0.degree. C. and containing a polar group, with (b) a compound comprising at least one terminal hydroxyl group at each end of the polymer molecule and having a glass transition temperature of -30.degree. C. or less.

Magnetic recording medium comprising ferromagnetic particles having

A magnetic recording medium comprising a non-magnetic support having thereon a multi-layer magnetic layer structure comprising ferromagnetic fine powder and a binder, wherein said multi-layer magnetic layer structure is formed by coating a first composition containing the ferromagnetic fine powder and a polyisocyanate compound on the non-magnetic support to form a first magnetic layer and coating a second composition containing ferromagnetic fine powder and an epoxy compound having at least one epoxy group or a coupling agent on said first magnetic layer to form a second magnetic layer, wherein coating of said second magnetic layer is conducted simultaneously with or after coating said first magnetic layer while said first magnetic layer is still in a wet state, by a simultaneous or successive multiple layered coating method.

Magnetic recording medium having multiple magnetic layers with specified

A magnetic recording medium which comprises a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic metal powder dispersed in a binder, wherein the binder contains a polyurethane resin having a ##STR1## group introduced therein, wherein R represents a hydrogen atom or a straight or branched alkyl group having 1 to 4 carbon atoms and M represents a hydrogen atom, an alkali metal or NH.sub.4.sup..sym.. The magnetic recording medium has excellent electromagnetic converting characteristics and running durability.

Magnetic recording medium containing a polyurethane resin having a

A magnetic recording medium comprising a non-magnetic support having a magnetic layer provided thereon, wherein a higher fatty acid hydroxylaluminum salt represented by formula (I) is provided in or on the magnetic layer:

Magnetic recording medium having a specified fatty acid hydroxylaluminum

A magnetic recording medium excellent in video output and audio output is disclosed which comprises a non-magnetic support having thereon at least plurality of a first magnetic layer and a second magnetic layer, containing ferromagnetic particles dispersed in a binder, in that sequence, wherein said first magnetic layer contains an amine-modified vinyl chloride copolymer as the binder. Preferably, the second magnetic layer contains a vinyl chloride copolymer as a binder having at least one polar group selected from the group consisting of --OH, an epoxy group, --COOM, --SO.sub.3 M, --OSO.sub.3 M, ##STR1## wherein M represents hydrogen, an alkali metal or ammonium.

Magnetic recording medium comprising a lower magnetic layer containing

A magnetic recording medium excellent in electromagnetic conversion characteristics and running characteristics is disclosed, which comprises a non-magnetic support and a magnetic layer formed thereon, said magnetic layer containing ferromagnetic particles dispersed in a binder, wherein said magnetic layer comprises a number of pores, said pores having

A magnetic recording medium comprising a non-magnetic support having thereon plural magnetic layers comprising a fine ferromagnetic powder and a binder and which are composed of at least two magnetic layers. In preparing the medium, a first magnetic layer-coating composition containing an epoxy compound having at least two epoxy groups is coated on the nonmagnetic support and a second magnetic layer-coating composition containing a polyisocyanate compound is coated over the first magnetic layer with a simultaneous or successive multiple layered coating method. The medium has an excellent electromagnetic characteristic and yields few dropouts, and it is usable as a medium for high density recording.

Magnetic recording medium comprising plural magnetic layers

A novel magnetic recording medium is disclosed comprising a non-magnetic support having provided thereon a magnetic layer containing a ferromagnetic powder and a binder, the ferromagnetic powder having a crystalline size of 250 .ANG. or less, and the surface of the magnetic layer having an ultramicrohardness of 40 g/(.mu.m).sup.2 or more.

Magnetic recording medium comprising a vinyl chloride based resin group

A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic particles dispersed in a binder, said magnetic layer having therein or on its surface a fluorine-containing oligomer surfactant which has a side chain having a poly(alkylene oxide) structure, a side chain terminated with a perfluoroalkyl group, and a side chain derived from an ester of acrylic or methacrylic acid with an aliphatic alcohol.

Magnetic recording medium comprising a fluorine containing oligomer

A magnetic recording medium is disclosed, which comprises a non-magnetic support having coated thereon a magnetic layer, said non-magnetic support being a film substantially composed of polyethylene terephthalate and having a cutting index (Z) of 6 or less as defined by equation (1):

Growing community of inventors

Kanagawa, Japan

Akira Ushimaru