Hitachi Maxell, Limited

Kenji Kohno

Kazushi Miyata

Hiroyuki Mitsuhashi

Mikio Kishimoto

Shoji Saibara

Naoki Usuki

Hisao Kanzaki

Yoshiyuki Nagataki

Masakazu Mitsunaga

Hiroshi Higashi

Yoshiaki Nishiya

Yoshinori Yamamoto

Takanori Kamoto

Sayaka Shinomoto

Noboru Isoe

Masahiro Kusumoto

Noriaki Ohtani

Yuko Uetani

Junko Ozaki

Satoko Arai

An infrared fluorescent particle comprising a functional group or a substance that is capable of binding to an analyte, wherein fluorescence at infrared wavelength is emitted from the particle upon exposure of the particle to excitation light at infrared wavelength. The infrared fluorescent particle of the present invention is capable of binding to the analyte. Due to a high penetration of the fluorescence and the excitation light into biological substances, the infrared fluorescent particle of the present invention can reduce an influence of luminescence, light absorption or light scattering which is occurred due to the analyte and the surrounding substances.

Functional infrared fluorescent particle

An infrared fluorescent particle comprising a functional group or a substance that is capable of binding to an analyte, wherein fluorescence at infrared wavelength is emitted from the particle upon exposure of the particle to excitation light at infrared wavelength. The infrared fluorescent particle of the present invention is capable of binding to the analyte. Due to a high penetration of the fluorescence and the excitation light into biological substances; the infrared fluorescent particle of the present invention can reduce an influence of luminescence, light absorption or light scattering which is occurred due to the analyte and the surrounding substances.

The present invention provides composite particles which have magnetism and simultaneously emit fluorescence with a variety of wavelengths, and which are suitable for use in the fields of biology, biochemistry or the like. The composite particles of the present invention comprise ferromagnetic iron oxide particles, fluorescent pigment particles and silica, and have an average particle size of 1 to 10 &#x3bc;m, a coercive force of 2.39 to 11.94 kA/m (30 to 150 oersted), saturation magnetization of 0.5 to 40 A.m/kg (0.5 to 40 emu/g). The peak value of the wavelength of fluorescence from the composite particle is in the range of 350 to 750 nm, when the composite particle is excited by light with a wavelength of 250 to 600 nm.

Composite particles comprising ferromagnetic particle, fluorescent pigment and a silica coating

An ink jet-printing medium comprising a substrate and an ink-receptive layer which has at least one layer and is formed on at least one major surface of the substrate, in which at least one layer of the ink-receptive layer contains fibrous fine powder as a pigment in an amount of at least 20% by weight of the total weight of the whole pigment contained in the layer which contains the fibrous fine powder. This medium can be produced at a low cost and has high printing quality while suppressing the discoloration or fading of the prints.

Ink jet-recording medium and method for producing the same

Method of reusing a coated substrate having a surface coating fixed to the substrate from which deposits are readily removed

A material having a substrate and a coating formed on the surface of the substrate, in which the coating contains a resin swellable with water such as an acrylic copolymer, and a water-soluble compound such as polyethylene glycol. When such a coating is formed on the surface of a material such as an office automation sheet, inks and other deposits can be easily removed with water from the surface, and the office automation sheet can be repeatedly used. Thus, such a coating is useful for reserving resources and protecting environments. Furthermore, dirts can be easily removed from furniture, electric appliances, and the like.

Coating from which deposits are easily removed and use thereof

A coating fixed to the surface of a material, the coating comprising a hydrophilic resin which swells with water but is not washed away, and is solid in air at ambient temperature, from which a deposit, such as a toner ink, can be readily removed with water.

Surface coating fixed to a material from which deposits are readily

A reversibly changeable heat-sensitive recording medium comprising a heat-sensitive layer which comprises a support, and a resin matrix and a low molecular weight organic material dispersed inside the resin matrix, the transparency of which changes reversibly depending on the temperature and which is formed on a support, and, if necessary, including a protection layer or an intermediate layer prepared above the heat-sensitive layer or on the lower surface of the support layer or between the support layer and any other layer or between any other layers in the reversibly changeable heat-sensitive recording medium, characterized in that a fluorescent body which emits visible light through the excitement by visible light is included in at least a portion of the support body, heat-sensitive layer and, if necessary, any other layer. This medium has excellent visibility and can be used with backgrounds of any of many possible colors.

Reversibly changeable heat-sensitive recording medium

A reversible heat-sensitive recording medium comprising a support; a heat-sensitive layer formed on top of the support, which layer comprises a resin matrix and a low molecular weight organic compound dispersed in said matrix, and a transparency of which is reversibly changeable depending on the temperature, in which a conductive powder is contained in at least a part of the support and heat-sensitive layer, which medium has a low-surface resistivity and excellent anti-static properties.

Reversible heat-sensitive recording medium

A coated substrate having a material substrate, and a coating composition fixed to a surface of the material substrate as a surface layer, the surface layer containing a hydrophilic resin which swells water but is not washed off by water, and which is solid in air at ambient temperatures that are encountered when said coated substrate is functioning as a reusable printing sheet and from which surface layer prior printing deposits can be readily removed, and when which the coated substrate has a surface resistivity of to 10.sup.5 to 10.sup.13 .OMEGA./.quadrature. at 25.degree. C., 50% RH after being dipped in water for 5 minutes and dried with a hot air of 60.degree. to 90.degree. C. for 5 minutes.

Reusable printing sheet

A magnetic recording medium having a non-magnetic substrate and a magnetic layer formed on at least one surface of the substrate and containing a fluorine-containing lubricant on or in a surface thereof, in which the fluorine-containing lubricant is a fluorinated block/non-fluorinated block/fluorinated block triblock copolymer.

Magnetic recording medium having a fluorinated block polymeric lubricant

Lubricant

A polycarbonate polyol having a main chain of the formula: ##STR1## wherein R is an aliphatic or alicyclic hydrocarbon group having 4 to 10 carbon atoms, and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; an aromatic polycarbonate polyurethane resin prepared from the polycarbonate polyol as set forth above and a polyisocyanate compound having two or more isocyanate groups in the molecule and optionally other components, particularly a chain extender having a polar group; a coating agent comprising the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and optionally a polyisocyanate compound as set forth above and a solvent; a cast film comprising a coating film formed from the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and a base film; and a magnetic recording medium comprising a magnetic layer formed from the aromatic polycarbonate polyurethane resin as set forth above and optionally the polyisocyanate compound as set forth above, and a base film.

Magnetic recording medium having a magnetic layer formed from an

A polycarbonate polyol having a main chain of the formula: ##STR1## wherein R is an aliphatic or alicyclic hydrcarbon group having 4 to 10 carbon atoms, and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; an aromatic polycarbonate polyurethane resin prepared from the polycarbonate polyol as set forth above and a polyisocyanate compound having two or more isocyanate groups in the molecule and optionally other components, particularly a chain extender having a polar group; a coating agent comprising the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and optionally a polyisocyanate compound as set forth above and a solvent; a cast film comprising a coating film formed from the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and a base film; and a magnetic recording medium compriisng a magnetic layer formed from the aromatic polycarbonate polyurethane resin as set forth above and optionally the polyisocyanate compound as set forth above, and a base film.

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Osaka, Japan

Kenji Kohno