Patents by Inventor Hiroto Tanigawa
Hiroto Tanigawa 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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Publication number: 20220194913Abstract: Provided is an alicyclic epoxy compound product used in applications for forming a cured product excellent in transparency and heat resistance. An alicyclic epoxy compound product of the present disclosure has a purity of a compound represented by Formula (1) of 85 wt. % or greater; and a total content of a compound represented by Formula (a) and a compound represented by Formula (b) of 0.5 wt. % or less, where X represents a single bond or a linking group. The alicyclic epoxy compound product of the present disclosure can be produced through subjecting a compound represented by Formula (1?) to a dehydration reaction to obtain a compound represented by Formula (1?), and reacting the resulting compound represented by Formula (1?) with an organic peracid.Type: ApplicationFiled: April 10, 2020Publication date: June 23, 2022Applicant: DAICEL CORPORATIONInventors: Hiroko INOUE, Hiroto TANIGAWA
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Patent number: 10611876Abstract: Provided is an epoxy-amine adduct. The epoxy-amine adduct is a compound that may be a compound I containing two or more amino groups per molecule, a compound corresponding to the compound I, except being modified with a compound II-1 containing two or more (meth)acryloyl groups per molecule, a compound corresponding to the compound I, except being modified with a lactone II-2, or a salt of the compound I. The compound I is an adduct between an epoxide (A) containing two or more cycloaliphatic epoxy groups per molecule and an amine (B) containing two or more amino groups per molecule. The compound I includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) and contains amino groups at both ends.Type: GrantFiled: December 16, 2014Date of Patent: April 7, 2020Assignee: DAICEL CORPORATIONInventors: Hiroko Inoue, Hiroto Tanigawa, Masanori Sakane, Toshihiko Nijukken, Tomio Ozaki, Tomoyuki Ono, Hiroshi Sakurai, Hiroshi Kimura, Takeshi Naito
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Publication number: 20170029557Abstract: Provided is a compound that contributes to better adhesion between resins and additive materials in polymer composites and is readily blendable with another component such as a resin. Related is an epoxy-amine adduct. The epoxy-amine adduct is a compound selected from the group consisting of a compound I containing two or more amino groups per molecule, a compound corresponding to the compound I, except being modified with a compound II-1 containing two or more (meth)acryloyl groups per molecule, a compound corresponding to the compound I, except being modified with a lactone II-2, and a salt of the compound I. The compound I is an adduct between an epoxide (A) containing two or more cycloaliphatic epoxy groups per molecule and an amine (B) containing two or more amino groups per molecule. The compound I includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) and contains amino groups at both ends.Type: ApplicationFiled: December 16, 2014Publication date: February 2, 2017Applicant: DAICEL CORPORATIONInventors: Hiroko INOUE, Hiroto TANIGAWA, Masanori SAKANE, Toshihiko NIJUKKEN, Tomio OZAKI, Tomoyuki ONO, Hiroshi SAKURAI, Hiroshi KIMURA, Takeshi NAITO
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Patent number: 7732627Abstract: A high-purity cycloaliphatic diepoxy compound of General Formula (II) is an epoxidized product of a cycloaliphatic diolefinic compound of General Formula (I) having an isomer content as detected in gas chromatography (GC) of 15% or less: wherein X represents a bivalent group selected from the group consisting of, for example, O, S, —SO—, —SO2—, —CH2—, and —C(CH3)2—; and R1 to R18 may be the same as or different from each other and each represent hydrogen atom, a halogen atom, a hydrocarbon group which may contain oxygen atom or a halogen atom, or an alkoxy group which may be substituted. Such a high-purity cycloaliphatic diepoxy compound is prepared by producing the cycloaliphatic diolefinic compound through distillation, epoxidizing the compound with an aliphatic percarboxylic acid containing substantially no water, carrying out desolvation, and further purifying the epoxidized compound through distillation.Type: GrantFiled: December 27, 2005Date of Patent: June 8, 2010Assignee: Daicel Chemical Industries, Ltd.Inventors: Hideyuki Takai, Hiroto Tanigawa, Katsuya Maruo
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Publication number: 20080045729Abstract: A high-purity cycloaliphatic diepoxy compound of General Formula (II) is an epoxidized product of a cycloaliphatic diolefinic compound of General Formula (I) having an isomer content as detected in gas chromatography (GC) of 15% or less: wherein X represents a bivalent group selected from the group consisting of, for example, O, S, —SO—, —SO2—, —CH2—, and —C(CH3)2—; and R1 to R18 may be the same as or different from each other and each represent hydrogen atom, a halogen atom, a hydrocarbon group which may contain oxygen atom or a halogen atom, or an alkoxy group which may be substituted. Such a high-purity cycloaliphatic diepoxy compound is prepared by producing the cycloaliphatic diolefinic compound through distillation, epoxidizing the compound with an aliphatic percarboxylic acid containing substantially no water, carrying out desolvation, and further purifying the epoxidized compound through distillation.Type: ApplicationFiled: December 27, 2005Publication date: February 21, 2008Inventors: Hideyuki Takai, Hiroto Tanigawa, Katsuya Maruo
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Patent number: 6610638Abstract: The present invention No. I is to obtain a high purity 3-alkoxy-1-propanol having the content of alcoholic impurities of not more than 0.3% by weight by allowing to react acrolein with a linear or branched alcohol having a carbon number of 1-4 using acrolein having the content of propionaldehyde of not more than 1% by weight as a raw material, a 3-alkoxy-1-propanol is produced by a hydrogenation reaction using hydrogen of a reaction mass under the presence of a catalyst, followed by recovering through a distillation of the 3-alkoxy-1-propanol having the content of alcoholic impurities of not more than 0.3% by weight from a crude solution in the hydrogenation reaction.Type: GrantFiled: November 30, 2000Date of Patent: August 26, 2003Assignee: Daicel Chemical Industries, Ltd.Inventors: Hiroto Tanigawa, Hiroto Miyake, Hiroshi Koyama, Akihiko Fujita, Katsuya Maruo
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Publication number: 20020183564Abstract: An alicyclic unsaturated alcohol (for example, tetrahydrobenzyl alcohol) having the purity of 99% by weight or more, the water content of 0.1% by weight or less and the acid value of 0.1 mg KOH/g or less can be produced, with high selectivity, by hydrogenating using an unsaturated cyclic aldehyde having the acid value of 10 mg KOH/g or less as a raw material; terminating the hydrogenation in the conversion of 70 to 99.8%; and rectifying the reaction product containing the unreacted unsaturated cyclic aldehyde. The high purity alicyclic unsaturated alcohol is useful as raw material chemicals for synthesizing drugs, agricultural chemicals, perfumes, and dyes etc.Type: ApplicationFiled: May 30, 2002Publication date: December 5, 2002Inventors: Hiroto Tanigawa, Koichi Okumura, Masaya Uenoya, Kango Fujitani, Yoshihiro Kihara
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Patent number: 6482995Abstract: An alicyclic unsaturated alcohol (for example, tetrahydrobenzyl alcohol) having the purity of 99% by weight or more, the water content of 0.1% by weight or less and the acid value of 0.1 mg KOH/g or less can be produced, with high selectivity, by hydrogenating using an unsaturated cyclic aldehyde having the acid value of 10 mg KOH/g or less as a raw material; terminating the hydrogenation in the conversion of 70 to 99.8%; and rectifying the reaction product containing the unreacted unsaturated cyclic aldehyde. The high purity alicyclic unsaturated alcohol is useful as raw material chemicals for synthesizing drugs, agricultural chemicals, perfumes, and dyes etc.Type: GrantFiled: May 30, 2002Date of Patent: November 19, 2002Assignee: Daicel Chemical Industries, LtdInventors: Hiroto Tanigawa, Koichi Okumura, Masaya Uenoya, Kango Fujitani, Yoshihiro Kihara
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Patent number: 6384247Abstract: Heliotropin is oxidized with a percarboxylic acid in the presence of formic acid and an optionally added organic solvent, to thereby produce sesamol at high efficiency while suppressing by-production of heliotropic acid.Type: GrantFiled: June 15, 2001Date of Patent: May 7, 2002Assignee: Daicel Chemical Industries, Ltd.Inventors: Hiroto Tanigawa, Kenji Oka
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Publication number: 20020016479Abstract: Heliotropin is oxidized with a percarboxylic acid in the presence of formic acid and an optionally added organic solvent, to thereby produce sesamol at high efficiency while suppressing by-production of heliotropic acid.Type: ApplicationFiled: June 15, 2001Publication date: February 7, 2002Inventors: Hiroto Tanigawa, Kenji Oka
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Patent number: 5648531Abstract: A process for continuously producing acetic anhydride alone or acetic anhydride and acetic acid by reacting methyl acetate and/or dimethyl ether and, optionally, water and/or methanol, with carbon monoxide alone or carbon monoxide and hydrogen in the presence of a rhodium compound and methyl iodide as principal catalysts. Trace impurities causative of tar formation are distilled and separated in an evaporator and/or a subsequent refining step to remove the same. The removal of the trace impurities causative of tar formation serves to decrease the amount of tar formed as an impurity.Type: GrantFiled: March 22, 1995Date of Patent: July 15, 1997Assignee: Daicel Chemical Industries, Ltd.Inventors: Yoshiaki Morimoto, Hiroto Tanigawa, Kazuyuki Akita
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Patent number: 5516735Abstract: A concentrated catalyst solution provided in the carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system comprising a rhodium compound and an alkali metal iodide to produce acetic anhydride is subjected to a carbonylation treatment with carbon monoxide or a mixture of carbon monoxide and hydrogen before it is applied to a process for separating the tar contained in the catalyst solution, thereby increasing the iodide ion content of the catalyst solution, thus enabling the rhodium compound to be stabilized.When the concentration of the iodide ion in the concentrated catalyst solution is increased by this method, there is no possibility of the balances between the rhodium concentration and, the alkali metal concentration and the iodine concentration of the carbonylation reaction system being disturbed even when the catalyst solution as reprocessed is returned to the carbonylation reaction system.Type: GrantFiled: October 21, 1994Date of Patent: May 14, 1996Assignee: Daicel Chemical Industries, Ltd.Inventor: Hiroto Tanigawa
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Patent number: 5385875Abstract: A concentrated catalyst solution used in a carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system comprising a rhodium compound and an alkali metal iodide to produce acetic anhydride is subjected to a carbonylation treatment with carbon monoxide, or a mixture of carbon monoxide and hydrogen, before it is applied to a process for separating the tar contained in the catalyst solution, thereby increasing the iodide ion content of the catalyst solution and enabling the rhodium compound to be stabilized.The balances between the rhodium concentration, the alkali metal concentration and the iodine concentration of the carbonylation reaction system are not disturbed, even when the catalyst solution as reprocessed is returned to the carbonylation reaction system.Type: GrantFiled: January 24, 1994Date of Patent: January 31, 1995Assignee: Daicel Chemical Industries, Ltd.Inventor: Hiroto Tanigawa
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Patent number: 5232884Abstract: A process for producing a carbonic acid ester which comprises reacting an alcohol with carbon monoxide and oxygen in the presence of a catalyst comprising a compound of divalent copper is disclosed, wherein the catalyst deactivated as a result of the carbonic acid ester-producing reaction is regenerated by subjecting a reaction mixture or a concentrate thereof containing the deactivated catalyst to water-replacement treatment, followed by heat treatment and weak-acid treatment.Type: GrantFiled: June 30, 1992Date of Patent: August 3, 1993Assignee: Daicel Chemical Industries, Ltd.Inventor: Hiroto Tanigawa