Patents by Inventor Yoshihiro Shiokawa
Yoshihiro Shiokawa 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: 7154008Abstract: In the production of an alkylbenzaldehyde by a method comprising a step of preparing a solution of complex of a starting alkylbenzene and a hydrogen fluoride-boron trifluoride catalyst and a step of formylation by bringing the solution of complex into contact with carbon monoxide, an alkylbenzene having at least one primary alkyl group having two or more carbon atoms on its benzene ring is used as the starting alkylbenzene. The preparation of the solution of complex is carried out in the presence of an aliphatic or alicyclic saturated hydrocarbon having 6 to 10 carbon atoms which contains at least one tertiary carbon atom but contains no quaternary carbon atom. By the combined use of the specific alkylbenzene and the aliphatic or alicyclic saturated hydrocarbon, the disproportionation of the alkylbenzene is prevented and the alkylbenzaldehyde is produced at high yields.Type: GrantFiled: October 14, 2004Date of Patent: December 26, 2006Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Kinji Kato, Yoshihiro Shiokawa, Tsuyoshi Hatakeyama, Mitsuharu Kitamura
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Patent number: 7126030Abstract: In the method of the invention, hydroxypivalaldehyde (3-hydroxy-2,2-dimethylpropanal) and/or its dimer is stored under solid conditions containing an amount of water. By storing such solid conditions, hydroxypivalaldehyde and/or its dimer is stored for a long period of time without reducing its purity.Type: GrantFiled: February 24, 2005Date of Patent: October 24, 2006Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Yoshihiro Shiokawa, Hiroaki Shigeta, Ikutaro Kuzuhara
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Publication number: 20050192466Abstract: In the method of the invention, hydroxypivalaldehyde (3-hydroxy-2,2-dimethylpropanal) and/or its dimer is stored under solid conditions containing an amount of water. By storing such solid conditions, hydroxypivalaldehyde and/or its dimer is stored for a long period of time without reducing its purity.Type: ApplicationFiled: February 24, 2005Publication date: September 1, 2005Inventors: Yoshihiro Shiokawa, Hiroaki Shigeta, Ikutaro Kuzuhara
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Publication number: 20050085670Abstract: In the production of an alkylbenzaldehyde by a method comprising a step of preparing a solution of complex of a starting alkylbenzene and a hydrogen fluoride-boron trifluoride catalyst and a step of formylation by bringing the solution of complex into contact with carbon monoxide, an alkylbenzene having at least one primary alkyl group having two or more carbon atoms on its benzene ring is used as the starting alkylbenzene. The preparation of the solution of complex is carried out in the presence of an aliphatic or alicyclic saturated hydrocarbon having 6 to 10 carbon atoms which contains at least one tertiary carbon atom but contains no quaternary carbon atom. By the combined use of the specific alkylbenzene and the aliphatic or alicyclic saturated hydrocarbon, the disproportionation of the alkylbenzene is prevented and the alkylbenzaldehyde is produced at high yields.Type: ApplicationFiled: October 14, 2004Publication date: April 21, 2005Inventors: Kinji Kato, Yoshihiro Shiokawa, Tsuyoshi Hatakeyama, Mitsuharu Kitamura
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Patent number: 5716916Abstract: A polyol ester-based lubricant comprising a polyol ester (A) and a polyol ester (B);the polyol ester (A) comprising an ester of a neopentyl polyol and an acid residue of carbon number of 6-17, in which alpha-carbon in the acid residue of the polyol ester is tertiarily branched, and when alkyl groups having 4 or more carbon atoms are bonded to the alpha-carbon, the alkyl groups are branched, andthe polyol ester (B) comprising an ester of a neopentyl polyol and an acid residue of carbon number of 6-17, in which alpha-carbon in the acid residue of the polyol ester is secondarily or tertiarily branched and alkyl groups bonded to the alpha-carbon are straight is provided. This polyol ester-based lubricant has high performance, as demonstrated by high compatibility with substitute fluorocarbons in a kinematic viscosity range of 28 to 40 cst at 40.degree. C., excellent hydrolysis resistance, and a low pour point.Type: GrantFiled: April 8, 1997Date of Patent: February 10, 1998Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Yoshihiro Shiokawa, Yoshifumi Sato, Kinji Kato
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Patent number: 5705459Abstract: A process for the production of a high-performance hybrid polyol ester having excellent compatibility with hydrofluorocarbons which are regarded as the most likely refrigerant and having excellent resistance to hydrolysis which esters are liable to undergo, the polyol ester having a plurality of branched fatty acid residues at least one of which has a different number of carbon atoms from that of the other branched fatty acid residue or those of the other branched fatty acid residues, the process comprising reacting at least two kinds of olefins having different numbers of carbon atoms, carbon monoxide and a polyhydric alcohol in the presence of hydrogen fluoride.Type: GrantFiled: December 27, 1995Date of Patent: January 6, 1998Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Yoshihiro Shiokawa, Shunichi Matsumoto, Yoshifumi Sato, Kinji Kato, Mitsuharu Kitamura
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Patent number: 5463095Abstract: A process for the production of esters, comprising allowing an olefin, carbon monoxide and an alcohol to react in the presence of hydrogen fluoride, in which the esters can be produced at high yields at a low temperature for a short period of time, the esters can be easily separated from a reaction solution, hydrogen fluoride can be recycled, the esters can be produced at a low cost, a mixture of esters can be easily produced, the kinetic viscosity of the mixture of the esters can be easily adjusted and the coloring of, and an increase in the viscosity of, the esters can be prevented.Type: GrantFiled: June 14, 1994Date of Patent: October 31, 1995Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Yoshihiro Shiokawa, Tadayoshi Takefumi, Shunichi Matsumoto, Yoshifumi Sato
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Patent number: 5208383Abstract: A process for producing an aromatic acylation product from an aromatic compound, an olefin and carbon monoxide, which comprises the steps of:(a) reacting an olefin with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride at a pressure of not more than 100 kg/cm.sup.Type: GrantFiled: January 24, 1992Date of Patent: May 4, 1993Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Tadayoshi Takefumi, Yoshihiro Shiokawa, Shunichi Matsumoto, Nobuyuki Tokura
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Patent number: 5011987Abstract: A process for manufacturing high-purity o-toluic acid from a partial oxidation product of o-xylene is disclosed. o-Toluic acid is widely used as a raw material for agricultural chemicals, medicines, polymerization initiators, and the like. Depending on its use, 99% by weight or more purity is demanded for o-toluic acid. Hitherto, o-toluic acid having purity of higher than 99% by weight could not be obtained by fractionation, and purification by fractional crystallization was used. Fractional crystallization is, however, and expensive operation and not only gives a low yield of product but also results a large amount of waste water. The process disclosed herein gives an economical, commercial way to obtain high purity o-toluic acid.Type: GrantFiled: May 15, 1990Date of Patent: April 30, 1991Assignee: Mitsubishi Gas Chemical CompanyInventors: Nobuyuki Tokura, Tadayoshi Takefumi, Shunichi Matsumoto, Yoshihiro Shiokawa
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Patent number: 4967011Abstract: The present invention relates to a process for decomposing an aromatic acylated compound.HF-BF.sub.3 complex in preparing an aromatic acylated compound by decomposing an aromatic acylated compound.HF-BF.sub.3 complex obtained by reacting an aromatic compound with an acylating agent in the presence of HF-BF.sub.3 as a catalyst, which comprises subjecting the aromatic acylated compound.HF-BF.sub.3 complex to thermal decomposition in the presence of at least one aromatic hydrocarbon (A.H.) selected from benzene, toluene and chlorobenzene and at least one saturated aliphatic hydrocarbon (S.H.) selected from pentane, hexane and cyclohexane, as a decomposing agent.Type: GrantFiled: August 11, 1989Date of Patent: October 30, 1990Assignee: Mitsubishi Gas Chemical Co., Inc.Inventors: Nobuyuki Tokura, Tadayoshi Takefumi, Shunichi Matsumoto, Tatsuhiko Yanagawa, Yoshihiro Shiokawa, Ichiyo Ohtsuka