Patents by Inventor Atsuhiko Nitta
Atsuhiko Nitta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5624998Abstract: The present invention provides an aqueous gel comprising a polymer of (meth)acrylamide or particular (meth)acrylamide derivative(s), particulate metal oxide(s) and an aqueous medium, a process for producing said gel, and products utilizing said gel.This aqueous gel can be produced so as to have transparency, has fire resistance and can prevent the spreading of flames, and is highly elastic. The aqueous gel, when produced as a transparent gel, becomes cloudy when heated or cooled and is useful for the shielding of heat rays or cold radiation.Type: GrantFiled: February 12, 1996Date of Patent: April 29, 1997Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Takashi Abe, Hideo Kamio, Hitoshi Yamashita, Atsuhiko Nitta
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Patent number: 5519088Abstract: The present invention provides an aqueous gel comprising a polymer of (meth)acrylamide or particular (meth)acrylamide derivative(s), particulate metal oxide(s) and an aqueous medium, a process for producing said gel, and products utilizing said gel.This aqueous gel can be produced so as to have transparency, has fire resistance and can prevent the spreading of flames, and is highly elastic. The aqueous gel, when produced as a transparent gel, becomes cloudy when heated or cooled and is useful for the shielding of heat rays or cold radiation.Type: GrantFiled: October 11, 1994Date of Patent: May 21, 1996Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Takashi Abe, Hideo Kamio, Hitoshi Yamashita, Atsuhiko Nitta
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Patent number: 5306572Abstract: Herein disclosed are organic thin film EL element having layer structures each of which comprises at least one organic thin film sandwiched between two electrodes, at least one of which is a metal thin film or one of which is a metal thin film and the other of which is a transparent conductive inorganic thin film, and an optional thin film of an inorganic semiconductor positioned between the transparent conductive thin film and the organic thin film, wherein an interfacial layer is fromed between the organic thin film and the metal thin film adjacent to the organic thin film by treating the organic thin film and/or the metal thin film with an organic phosphorus atom-containing compound; and/or wherein an interfacial layer is formed between the organic thin film and the inorganic thin film adjacent to the inorganic thin film by treating the organic thin film and/or the inorganic thin film with a silane-coupling agent.Type: GrantFiled: December 23, 1992Date of Patent: April 26, 1994Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yutaka Ohashi, Nobuhiro Fukuda, Atsuhiko Nitta, Sadao Kobayashi
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Patent number: 5292821Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and, N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.Type: GrantFiled: June 28, 1993Date of Patent: March 8, 1994Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
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Patent number: 5239014Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.Type: GrantFiled: July 3, 1991Date of Patent: August 24, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
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Patent number: 5200668Abstract: This invention relates to an injection type thin film luminescence element having a high luminance and a high stability characterized in having two electrode layers at least one of which is transparent or translucent and having between these two electrode layers a luminescence function-manifesting layer comprising a laminated layer of a p-type or n-type inorganic semiconductor thin film layer and an organic compound thin film layer.Type: GrantFiled: July 18, 1990Date of Patent: April 6, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yutaka Ohashi, Atsuhiko Nitta, Nobuhiro Fukuda, Hiroshi Waki
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Patent number: 5155191Abstract: By dispersing and polymerizing at least one N-alkyl-or N-alkylene-substituted (meth)acrylamide or a mixture of at least one N-alkyl- or N-alkylene-substituted (meth)acrylamide and other copolymerizable monomer is an aqueous inorganic salt solution having inorganic particulates suspended, there is provided a preparation process of granular polymers containing no impurities such as polymer stabilizers, surface active agents, etc. The granular polymers are useful as concentrating agents, slow releasing base materials, etc.Type: GrantFiled: February 14, 1992Date of Patent: October 13, 1992Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Takashi Abe, Kouji Ohkoshi, Atsuhiko Nitta
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Patent number: 5039757Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.Type: GrantFiled: December 21, 1989Date of Patent: August 13, 1991Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
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Patent number: 4835312Abstract: An N-substituted amide compound is produced with a high yield by initiating a reaction among a starting amide compound such as a saturated or unsaturated, aliphatic or aromatic carboxylic acid amide, a halogen-substituted compound such as an alkyl halide and a strongly basic substance while maintaining the basic substance in a suspended state.Type: GrantFiled: July 2, 1986Date of Patent: May 30, 1989Assignee: Mitsui Chemicals, IncorporatedInventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta
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Patent number: 4828710Abstract: This invention pertains to a water-insolubilized resin of a polymer of at least one monomer selected from N-alkyl- or N-alkylene-substituted acrylamides or methacrylamides represented by the following general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 mean individually a hydrogen atom or methyl group and R.sub.3 denotes a methyl, ethyl or propyl group, with the proviso that R.sub.3 is an ethyl or propyl group when R.sub.2 stands for a hydrogen atom, and that R.sub.3 is a methyl or ethyl group when R.sub.2 stands for a methyl group, or wherein R.sub.2 and R.sub.3 form --CH.sub.2).sub.4 or --CH.sub.2).sub.2 O--CH.sub.2).sub.2 in combination; or a copolymer of at least one monomer selected from the acrylamides or methacrylamides and another copolymerizable monomer. The resin has water-absorbing capacity which varies in degree depending on temperature and, when heated, undergoes shrinkage even in the presence of a large excess of water to release once-absorbed water.Type: GrantFiled: July 21, 1987Date of Patent: May 9, 1989Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio
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Patent number: 4729834Abstract: Disclosed herein is a high molecular composite material, which comprises as one component thereof a water insolubilized homopolymer of at least one monomer selected from specific N-alkyl- or N-alkylene-substituted (meth)acrylamides, a second copolymer of said at least one monomer with one or more monomers other than the (meth)acrylamides and copolymerizable therewith, or a water-insolubilized product of the homopolymer or either first or second copolymer. The water-insoluble product can form, with a low or high molecular compound containing one or more active hydrogen or hydrophobic groups, a composite material which may be applied widely for absorbing and desorbing a variety of valuable synthetic compounds and natural matter.Type: GrantFiled: June 26, 1986Date of Patent: March 8, 1988Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio, Katsutoshi Nagai
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Patent number: 4725499Abstract: Disclosed is a novel process for preparing amidoalkanesulfonic acids of the general formula ##STR1## or derivatives thereof by reacting a nitrile compound (1) with a .beta.-hydroxyalkanesulfonic acid or a derivative thereof (2) in concentrated sulfuric acid.Among the compounds of the general formula (3) and derivatives thereof, unsaturated amido- and phenyl-substituted alkanesulfonic acids and derivatives thereof (in particular, 2-acrylamido-2-phenylpropanesulfonic acid and derivatives thereof) represented by the general formula ##STR2## can be copolymerized with other monomers and the like to provide useful materials such as copolymer-coated solid materials, copolymer emulsions, pigment dispersants and the like.Type: GrantFiled: November 13, 1986Date of Patent: February 16, 1988Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Hiroshi Itoh, Atsuhiko Nitta, Hideo Kamio
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Patent number: 4718899Abstract: Disclosed herein is a urine absorbing and holding material, which comprises a homopolymer of at least one monomer selected from specific N-alkyl- or N-alkylene-substituted acrylamides and methacrylamides, a copolymer of two or more of the acrylamides and methacrylamides, a copolymer of said at least one monomer with one or more monomers other the the acrylamides and methacrylamides and copolymerizable therewith, and being a water-insolubilized product. By combining the urine absorbing and holding material in the form of powder, granules, flakes, fibers or a film with a fibrous material in the form of a woven fabric, non-woven fabric or a flocculent material, a useful urea absorbing and holding composite material is obtained in the form of a pad, diaper or drawers.Type: GrantFiled: October 1, 1985Date of Patent: January 12, 1988Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio
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Patent number: 4701283Abstract: Disclosed is a novel process for preparing amidoalkanesulfonic acids of the general formula ##STR1## or derivatives thereof by reacting a nitrile compound (1) with a .beta.-hydroxyalkanesulfonic acid or a derivative thereof (2) in concentrated sulfuric acid.Among the compounds of the general formula (3) and derivatives thereof, unsaturated amido- and phenyl-substituted alkanesulfonic acids and derivatives thereof (in particular, 2-acrylamido-2-phenylpropane-sulfonic acid and derivatives thereof) represented by the general formula ##STR2## can be copolymerized with other monomers and the like to provide useful materials such as copolymer-coated solid materials, copolymer emulsions, pigment dispersants and the like.Type: GrantFiled: November 1, 1985Date of Patent: October 20, 1987Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Atsuhiko Nitta, Hideo Kamio
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Patent number: 4683258Abstract: Disclosed herein is an agent for absorbing and releasing water vapor, which comprises a homopolymer of at least one monomer selected from specific N-alkyl- or N-alkylene-substituted acrylamides and methacrylamides, a copolymer of two or more of the acrylamides and methacrylamides, a copolymer of said at least one monomer with one or more monomers other than the acrylamides and methacrylamides and copolymerizable therewith, or a water-insolubilized product of the homopolymer or either one of the copolymers. The above agent has broad utility for humidity contol of gases, humidity control in green houses and prevention of fogging on surfaces of transparent materials, as humidity sensors and dew sensors, etc.Type: GrantFiled: January 17, 1986Date of Patent: July 28, 1987Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio, Ryosuke Enoshita, Tamotu Uejima, Takahiro Ouchi, Kazuki Abe, Sadao Kobayashi
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Patent number: 4659773Abstract: Disclosed is a novel process for preparing amidoalkanesulfonic acids of the general formula ##STR1## or derivatives thereof by reacting a nitrile compound (1) with a .beta.-hydroxyalkanesulfonic acid or a derivative thereof (2) in concentrated sulfuric acid.Among the compounds of the general formula (3) and derivatives thereof, unsaturated amido- and phenyl-substituted alkanesulfonic acids and derivatives thereof (in particular, 2-acrylamido-2-phenylpropanesulfonic acid and derivatives thereof) represented by the general formula ##STR2## can be copolymerized with other monomers and the like to provide useful materials such as copolymer-coated solid materials, copolymer emulsions, pigment dispersants and the like.Type: GrantFiled: August 23, 1985Date of Patent: April 21, 1987Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Atsuhiko Nitta, Hideo Kamio
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Patent number: 4654177Abstract: Hydroxyalkanesulfonic acids of the general formula ##STR1## where R is a lower alkyl group having 1 to 10 carbon atoms, and derivatives (such as alkali metal salts and the like) of the sulfonic acids are novel compounds. These compounds can be prepared, for example, by a process which comprises reacting an .alpha.-alkylstyrene with the hydrogensulfite ion in an aqueous medium in the presence of oxygen. These compounds are useful as raw materials for the manufacture of amidoalkanesulfonic acid derivatives having such applications as lime soap dispersants, raw materials for the synthesis of water-soluble polymers, fiber modifiers and the like.Type: GrantFiled: September 17, 1985Date of Patent: March 31, 1987Assignee: Mitsui-Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Atsuhiko Nitta, Hideo Kamio
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Patent number: 4649219Abstract: Disclosed herein are novel unsaturated cyclic amide-substituted ether compounds having a wide range of utility in crosslinking agents, adhesives, paints, raw materials for hygroscopic resins, etc. These compounds are prepared by reacting cyclic halogen-substituted ether compounds with unsaturated amide compounds in the presence of a strong basic substance in an aprotic polar solvent.Type: GrantFiled: March 6, 1985Date of Patent: March 10, 1987Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio
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Patent number: RE33355Abstract: Disclosed herein is an agent for absorbing and releasing water vapor, which comprises a homopolymer of at least one monomer selected from specific N-alkyl- or N-alkylene-substituted acrylamides and methacrylamides, a copolymer of two or more of the acrylamides and methacrylamides, a copolymer of said at least one monomer with one or more monomers other than the acrylamides and methacrylamides and copolymerizable therewith, or a water-insolubilized product of the homopolymer or either one of the copolymers. The above agent has broad utility for humidity control of gases, humidity control in green houses and prevention of fogging on surfaces of transparent materials, as humidity sensors and dew sensors, etc.Type: GrantFiled: May 16, 1988Date of Patent: September 25, 1990Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroshi Itoh, Toshimi Nakagawa, Atsuhiko Nitta, Tomio Tanaka, Hideo Kamio, Ryosuke Enoshita, Tamotu Uejima, Takahiro Ouchi, Kazuki Abe, Sadao Kobayashi