Patents by Inventor Keisuke Shimokawa
Keisuke Shimokawa 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: 20230348367Abstract: The present invention provides a method for producing an aromatic nitrile compound, the method comprising a dehydration reaction wherein a desired compound can be selectively obtained with high yield while suppressing the generation of byproducts during the regeneration of an aromatic amide compound into the corresponding aromatic nitrile compound. In addition, the present invention realizes a method for efficiently producing a carbonate ester by applying the abovementioned production method to a method for producing a carbonate ester. The above are achieved by means of a method for producing an aromatic nitrile compound involving a dehydration reaction wherein an aromatic amide compound is dehydrated, the method having a contact step for bringing the aromatic amide compound into contact with a catalyst in a gas phase during the dehydration reaction.Type: ApplicationFiled: April 27, 2023Publication date: November 2, 2023Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hidefumi HARADA, Takehiko ISOBE, Keisuke SHIMOKAWA, Ryotaro UMEZU
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Patent number: 11673856Abstract: The present invention provides a method for producing an aromatic nitrile compound, the method comprising a dehydration reaction wherein a desired compound can be selectively obtained with high yield while suppressing the generation of by-products during the regeneration of an aromatic amide compound into the corresponding aromatic nitrile compound. In addition, the present invention realizes a method for efficiently producing a carbonate ester by applying the abovementioned production method to a method for producing a carbonate ester. The above are achieved by means of a method for producing an aromatic nitrile compound involving a dehydration reaction wherein an aromatic amide compound is dehydrated, the method having a contact step for bringing the aromatic amide compound into contact with a catalyst in a gas phase during the dehydration reaction.Type: GrantFiled: July 25, 2019Date of Patent: June 13, 2023Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hidefumi Harada, Takehiko Isobe, Keisuke Shimokawa, Ryotaro Umezu
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Publication number: 20220389159Abstract: The present application provides a polycarbonate resin including structural units (A) represented by general formula (1) and structural units (B) represented by general formula (4). (In general formula (1), R1, R2, R3, R4, R5, R6, R7, and R8 each independently represents a hydrogen atom, etc., and X represents —O—, etc.) (In general formula (4), Rz and Rx each independently represents a hydrogen atom or a C1-3 alkyl group, i represents an integer 3-10 and p represents an integer 5-600.Type: ApplicationFiled: September 1, 2020Publication date: December 8, 2022Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Tomoya TSUJIMURA, Keisuke SHIMOKAWA, Takehiko ISOBE, Hidefumi HARADA
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Publication number: 20220356346Abstract: The present application provides: a polycarbonate resin which has heat resistance and is able to be produced using a starting material that is derived from natural products; and a monomer compound which enables the achievement of this resin. A polycarbonate resin which includes a constituent unit represented by general formula (1); a monomer compound which enables the achievement of this resin; and a polycarbonate resin which includes a constituent unit represented by general formula (1) and a constituent unit represented by general formula (2).Type: ApplicationFiled: September 11, 2020Publication date: November 10, 2022Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Keisuke SHIMOKAWA, Hidefumi HARADA, Takehiko ISOBE
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Patent number: 11427679Abstract: A polycarbonate resin composition containing 0.1 to 10 parts by mass of a polycarbonate copolymer (B) having carbonate bonding between (B1) bisphenol A and a (B2) polyalkylene glycol and 0.005 to 0.5 parts by mass of a phosphorus-containing stabilizer (C) relative to 100 parts by mass of a polycarbonate resin (A).Type: GrantFiled: February 25, 2019Date of Patent: August 30, 2022Assignees: Mitsubishi Engineering-Plastics Corporation, MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Keisuke Tomita, Hidefumi Harada, Takehiko Isobe, Keisuke Shimokawa, Jungo Taguchi
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Publication number: 20220259373Abstract: Provided is a polycarbonate resin having a structural unit (I) represented by formula (1) below: wherein L1 and L2 each independently represent a divalent linking group selected from an alkylene group, a cycloalkylene group, an arylene group, an oxyalkylene group, an oxyarylene group, and a group formed by combining two or more of these, where one or more hydrogen atoms of the linking group are optionally further replaced with substituents, and two of the substituents are optionally bonded to each other to form a ring structure.Type: ApplicationFiled: July 27, 2020Publication date: August 18, 2022Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Keisuke SHIMOKAWA, Hidefumi HARADA, Takehiko ISOBE, Jungo TAGUCHI
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Publication number: 20220177646Abstract: Provided is a method of manufacturing an aromatic polycarbonate resin composition with high fluidity, particularly during low shear, and a good color. An aromatic polycarbonate resin composition including: an aromatic polycarbonate resin that has a structural unit expressed by general formula (1); a aliphatic cyclic carbonate that is expressed by general formula (2) and is included at a ratio of 10 ppm-10,000 ppm; an aromatic cyclic carbonate that is expressed by general formula (3); and at least one compound selected from the group consisting of compounds expressed by general formulas (4)-(6), wherein the total content of the aromatic cyclic carbonate and the compound(s) expressed by general formula(s) (4)-(6) is 0.1 mass %-2.0 mass % by bisphenol A-converted value.Type: ApplicationFiled: February 9, 2022Publication date: June 9, 2022Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori ISAHAYA, Atsushi HIRASHIMA, Hidefumi HARADA, Maki ITO, Jun-ya HAYAKAWA, Takehiko ISOBE, Yousuke SHINKAI, Keisuke SHIMOKAWA
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Publication number: 20210261496Abstract: The present invention provides a method for producing an aromatic nitrile compound, the method comprising a dehydration reaction wherein a desired compound can be selectively obtained with high yield while suppressing the generation of by-products during the regeneration of an aromatic amide compound into the corresponding aromatic nitrile compound. In addition, the present invention realizes a method for efficiently producing a carbonate ester by applying the abovementioned production method to a method for producing a carbonate ester. The above are achieved by means of a method for producing an aromatic nitrile compound involving a dehydration reaction wherein an aromatic amide compound is dehydrated, the method having a contact step for bringing the aromatic amide compound into contact with a catalyst in a gas phase during the dehydration reaction.Type: ApplicationFiled: July 25, 2019Publication date: August 26, 2021Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hidefumi HARADA, Takehiko ISOBE, Keisuke SHIMOKAWA, Ryotaro UMEZU
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Patent number: 11021571Abstract: Provided is a manufacturing method for a high molecular weight aromatic polycarbonate resin that has superior fluidity and for which a good color and a sufficiently high molecular weight can be achieved. A manufacturing method for a high molecular weight aromatic polycarbonate resin includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is kept in a molten state, and is mixed with an aromatic polycarbonate prepolymer within ten hours after obtaining the catalyst composition, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: GrantFiled: March 24, 2017Date of Patent: June 1, 2021Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori Isahaya, Atsushi Hirashima, Hidefumi Harada, Maki Ito, Jun-ya Hayakawa, Takehiko Isobe, Yousuke Shinkai, Keisuke Shimokawa
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Patent number: 11014869Abstract: The present application addresses the problem of providing a method for efficiently producing a dialkyl carbonate. The problem can be solved by a method for producing a dialkyl carbonate by reacting urea and at least one alkyl carbamate with an aliphatic alcohol in the presence of a catalyst, the method including introducing a gas for expelling ammonia generated by the reaction into a reactor in which the reaction is being conducted and discharging the ammonia generated in the reactor and the introduced gas, the reaction being conducted so that the gas introduction satisfies relationship (1). 52.0<((A+B)×22400+L×M/17.03×22400)/L<91.0??(1) (In formula (1), A, B, L, and M are as defined above.Type: GrantFiled: August 10, 2018Date of Patent: May 25, 2021Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INCInventors: Keisuke Shimokawa, Hidefumi Harada, Takehiko Isobe, Hongyu Liu
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Publication number: 20210087333Abstract: A polycarbonate resin composition containing 0.1 to 10 parts by mass of a polycarbonate copolymer (B) having carbonate bonding between (B1) bisphenol A and a (B2) polyalkylene glycol and 0.005 to 0.5 parts by mass of a phosphorus-containing stabilizer (C) relative to 100 parts by mass of a polycarbonate resin (A).Type: ApplicationFiled: February 25, 2019Publication date: March 25, 2021Applicants: Mitsubishi Engeering-Platics Corporation, MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Keisuke TOMITA, Hidefumi HARADA, Takehiko ISOBE, Keisuke SHIMOKAWA, Jugo TAGUCHI
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Patent number: 10927216Abstract: Provided is a high molecular weight aromatic polycarbonate resin manufacturing method that suppresses the occurrence of heterogeneous structures and can achieve a sufficiently high molecular weight. A high molecular weight aromatic polycarbonate resin manufacturing method including: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe, with a transfer period of 10 hours or less; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: GrantFiled: March 24, 2017Date of Patent: February 23, 2021Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori Isahaya, Atsushi Hirashima, Hidefumi Harada, Maki Ito, Jun-ya Hayakawa, Takehiko Isobe, Yousuke Shinkai, Keisuke Shimokawa
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Patent number: 10894860Abstract: A high molecular weight aromatic polycarbonate resin manufacturing method that can achieve good quality and sufficiently high molecular weight includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank, under a pressure that is greater than or equal to the vapor pressure of the dialcohol compound at the temperature of the prepolymer mixing tank and is less than or equal to 5 MPa, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: GrantFiled: March 24, 2017Date of Patent: January 19, 2021Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori Isahaya, Atsushi Hirashima, Hidefumi Harada, Maki Ito, Jun-ya Hayakawa, Takehiko Isobe, Yousuke Shinkai, Keisuke Shimokawa
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Publication number: 20200239402Abstract: The present application addresses the problem of providing a method for efficiently producing a dialkyl carbonate. The problem can be solved by a method for producing a dialkyl carbonate by reacting urea and at least one alkyl carbamate with an aliphatic alcohol in the presence of a catalyst, the method including introducing a gas for expelling ammonia generated by the reaction into a reactor in which the reaction is being conducted and discharging the ammonia generated in the reactor and the introduced gas, the reaction being conducted so that the gas introduction satisfies relationship (1). 52.0<((A+B)×22400+L×M/17.03×22400)/L<91.0??(1) (In formula (1), A, B, L, and M are as defined above.Type: ApplicationFiled: August 10, 2018Publication date: July 30, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Keisuke SHIMOKAWA, Hidefumi HARADA, Takehiko ISOBE, Hongyu LIU
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Publication number: 20200216611Abstract: Provided is a manufacturing method for a high molecular weight aromatic polycarbonate resin that has superior fluidity and for which a good color and a sufficiently high molecular weight can be achieved. A manufacturing method for a high molecular weight aromatic polycarbonate resin includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is kept in a molten state, and is mixed with an aromatic polycarbonate prepolymer within ten hours after obtaining the catalyst composition, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: ApplicationFiled: March 24, 2017Publication date: July 9, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori ISAHAYA, Atsushi HIRASHIMA, Hidefumi HARADA, Maki ITO, Jun-ya HAYAKAWA, Takehiko ISOBE, Yousuke SHINKAI, Keisuke SHIMOKAWA
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Publication number: 20190119441Abstract: A high molecular weight aromatic polycarbonate resin manufacturing method that can achieve good quality and sufficiently high molecular weight includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank, under a pressure that is greater than or equal to the vapor pressure of the dialcohol compound at the temperature of the prepolymer mixing tank and is less than or equal to 5 MPa, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: ApplicationFiled: March 24, 2017Publication date: April 25, 2019Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori ISAHAYA, Atsushi HIRASHIMA, Hidefumi HARADA, Maki ITO, Jun-ya HAYAKAWA, Takehiko ISOBE, Yousuke SHINKAI, Keisuke SHIMOKAWA
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Publication number: 20190092901Abstract: Provided is a high molecular weight aromatic polycarbonate resin manufacturing method that suppresses the occurrence of heterogeneous structures and can achieve a sufficiently high molecular weight. A high molecular weight aromatic polycarbonate resin manufacturing method including: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe, with a transfer period of 10 hours or less; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.Type: ApplicationFiled: March 24, 2017Publication date: March 28, 2019Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori ISAHAYA, Atsushi HIRASHIMA, Hidefumi HARADA, Maki ITO, Jun-ya HAYAKAWA, Takehiko ISOBE, Yousuke SHINKAI, Keisuke SHIMOKAWA
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Publication number: 20190085123Abstract: Provided is an aromatic polycarbonate resin composition with high fluidity, particularly during low shear, and a good color. An aromatic polycarbonate resin composition including: an aromatic polycarbonate resin that has a structural unit expressed by general formula (1); a aliphatic cyclic carbonate that is expressed by general formula (2) and is included at a ratio of 10 ppm-10,000 ppm; an aromatic cyclic carbonate that is expressed by general formula (3); and at least one compound selected from the group consisting of compounds expressed by general formulas (4)-(6), wherein the total content of the aromatic cyclic carbonate and the compound(s) expressed by general formula(s) (4)-(6) is 0.1 mass %-2.0 mass % by bisphenol A-converted value.Type: ApplicationFiled: March 24, 2017Publication date: March 21, 2019Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Yoshinori ISAHAYA, Atsushi HIRASHIMA, Hidefumi HARADA, Maki ITO, Jun-ya HAYAKAWA, Takehiko ISOBE, Yousuke SHINKAI, Keisuke SHIMOKAWA
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Patent number: 10008670Abstract: A method of peeling a laminate according to the disclosure includes: forming a first adhesive layer on a first substrate, the first adhesive layer having adhesive force that satisfies the following Expression (1) and one or both of the following Expressions (2) and (3); firmly attaching a second substrate onto the first adhesive layer; forming a first functional layer on the second substrate; and peeling off the first substrate from the second substrate.Type: GrantFiled: September 22, 2016Date of Patent: June 26, 2018Assignee: JOLED, Inc.Inventors: Kenichi Izumi, Keisuke Shimokawa, Shin Akasaka, Hiroyuki Abe, Shinpei Irie, Takatoshi Saito
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Publication number: 20170012202Abstract: A method of peeling a laminate according to the disclosure includes: forming a first adhesive layer on a first substrate, the first adhesive layer having adhesive force that satisfies the following Expression (1) and one or both of the following Expressions (2) and (3); firmly attaching a second substrate onto the first adhesive layer; forming a first functional layer on the second substrate; and peeling off the first substrate from the second substrate.Type: ApplicationFiled: September 22, 2016Publication date: January 12, 2017Applicant: JOLED INC.Inventors: Kenichi IZUMI, Keisuke SHIMOKAWA, Shin AKASAKA, Hiroyuki ABE, Shinpei IRIE, Takatoshi SAITO