Patents by Inventor Hirohito Ishizuka
Hirohito Ishizuka 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: 20220282038Abstract: A polyester carbonate resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), a structural unit derived from a dicarboxylic acid or a derivative thereof, and a structural unit derived from a carbonic acid diester. The polyester carbonate can be used, e.g., in optical systems.Type: ApplicationFiled: May 16, 2022Publication date: September 8, 2022Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki KATO, Hirohito ISHIZUKA, Munenori SHIRATAKE, Kentaro ISHIHARA
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Patent number: 11370882Abstract: A polyester carbonate resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), a structural unit derived from a dicarboxylic acid or a derivative thereof, and a structural unit derived from a carbonic acid diester. The polyester carbonate can be used, e.g., in optical systems.Type: GrantFiled: February 25, 2020Date of Patent: June 28, 2022Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki Kato, Hirohito Ishizuka, Munenori Shiratake, Kentaro Ishihara
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Patent number: 10689486Abstract: According to one embodiment, a polyester resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), and a structural unit derived from a dicarboxylic acid or a derivative thereof.Type: GrantFiled: May 1, 2015Date of Patent: June 23, 2020Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki Kato, Hirohito Ishizuka, Munenori Shiratake, Kentaro Ishihara
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Publication number: 20200190259Abstract: According to one embodiment, a polyester resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), and a structural unit derived from a dicarboxylic acid or a derivative thereof.Type: ApplicationFiled: February 25, 2020Publication date: June 18, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki KATO, Hirohito ISHIZUKA, Munenori SHIRATAKE, Kentaro ISHIHARA
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Patent number: 9982129Abstract: A polycarbonate resin composition including: a polycarbonate resin (A) which has a constitutional unit (a) represented by general formula (4); and a polycarbonate resin (B) which has a constitutional unit (b) represented by general formula (5). (In formula (4), X represents an alkylene group having 1 to 4 carbon atoms.) (In formula (5), R1 and R2 independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkoxyl group having 5 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aryloxy group having 6 to 20 carbon atoms; and Y represents an alkylene group having 1 to 4 carbon atoms.Type: GrantFiled: April 28, 2015Date of Patent: May 29, 2018Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hirohito Ishizuka, Noriyuki Kato, Kentaro Ishihara, Munenori Shiratake, Manabu Hirakawa
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Publication number: 20170051146Abstract: A polycarbonate resin composition including: a polycarbonate resin (A) which has a constitutional unit (a) represented by general formula (4); and a polycarbonate resin (B) which has a constitutional unit (b) represented by general formula (5). (In formula (4), X represents an alkylene group having 1 to 4 carbon atoms.) (In formula (5), R1 and R2 independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkoxyl group having 5 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aryloxy group having 6 to 20 carbon atoms; and Y represents an alkylene group having 1 to 4 carbon atoms.Type: ApplicationFiled: April 28, 2015Publication date: February 23, 2017Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hirohito ISHIZUKA, Noriyuki KATO, Kentaro ISHIHARA, Munenori SHIRATAKE, Manabu HIRAKAWA
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Publication number: 20170044312Abstract: According to one embodiment, a polyester resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), and a structural unit derived from a dicarboxylic acid or a derivative thereof.Type: ApplicationFiled: May 1, 2015Publication date: February 16, 2017Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki KATO, Hirohito ISHIZUKA, Munenori SHIRATAKE, Kentaro ISHIHARA
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Publication number: 20170044311Abstract: The polyester resin according to the present invention is a polyester resin mainly including a diol structural unit and a dicarboxylic acid structural unit, wherein 10 to 84 mol % of the diol structural unit is a structural unit derived from ethylene glycol, 16 to 90 mol % of the diol structural unit is a structural unit derived from neopentyl glycol represented by a particular formula (i), and 50 to 100 mol % of the dicarboxylic acid structural unit is a structural unit derived from a naphthalenedicarboxylic acid. Further, the optical lens according to the present invention is obtained by molding the polyester resin. Furthermore, the optical lens system according to the present invention includes the optical lens and an additional optical lens.Type: ApplicationFiled: April 21, 2015Publication date: February 16, 2017Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Noriyuki KATO, Manabu HIRAKAWA, Hirohito ISHIZUKA, Takeshi HIROKANE, Takuya MINEZAKI
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Patent number: 9458293Abstract: According to the present invention, a composition for optical material, which is capable of providing a homogeneous optical material, can be prepared through pre-polymerization reaction between (a) an inorganic compound having a sulfur atom and (b) an episulfide compound using a hindered amine as a catalyst, followed by mixing with (c) a polythiol compound and (d) a polyisocyanate compound. Moreover, this composition for optical material can be polymerized and cured to thereby provide an optical material having high refractive index (ne of 1.73 or higher), high strength (an elongation of 13% or more in three-point bend test and good drilling resistance), and high heat resistance (a softening point of 70° C. or higher, as measured by TMA).Type: GrantFiled: January 30, 2013Date of Patent: October 4, 2016Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Takashi Aoki, Hirohito Ishizuka, Eiji Koshiishi, Motoharu Takeuchi
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Patent number: 9360593Abstract: The polycarbonate resin of the present invention has a structural unit represented by general formula (A): (in formula (A), X is an alkylene group having 1 to 4 carbon atoms).Type: GrantFiled: November 1, 2013Date of Patent: June 7, 2016Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hirohito Ishizuka, Yoshio Nishimura, Noriyuki Kato, Takashi Ishii, Kouji Hirose, Kentarou Ishihara, Munenori Shiratake
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Patent number: 9321887Abstract: Provided is a thermoplastic resin having a high refractive index, which is favorable as an optical material. Provided are a polyformal resin copolymer comprising a high refractive index diol that has a fluorene skeleton and an aromatic diol that has a low glass-transition point when polymerized, and a method for producing the same.Type: GrantFiled: November 6, 2013Date of Patent: April 26, 2016Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Munenori Shiratake, Yoshio Nishimura, Noriyuki Kato, Takashi Ishii, Hirohito Ishizuka
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Publication number: 20150285954Abstract: The polycarbonate resin of the present invention has a structural unit represented by general formula (A): (in formula (A), X is an alkylene group having 1 to 4 carbon atoms).Type: ApplicationFiled: November 1, 2013Publication date: October 8, 2015Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hirohito Ishizuka, Yoshio Nishimura, Noriyuki Kato, Takashi Ishii, Kouji Hirose, Kentarou Ishihara, Munenori Shiratake
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Publication number: 20150284510Abstract: Provided is a thermoplastic resin having a high refractive index, which is favorable as an optical material. Provided are a polyformal resin copolymer comprising a high refractive index diol that has a fluorene skeleton and an aromatic diol that has a low glass-transition point when polymerized, and a method for producing the same.Type: ApplicationFiled: November 6, 2013Publication date: October 8, 2015Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Munenori Shiratake, Yoshio Nishimura, Noriyuki Kato, Takashi Ishii, Hirohito Ishizuka
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Patent number: 9150694Abstract: A composition for use in an optical material is disclosed which is capable of providing an optical material satisfying a high refractive index (ne is 1.73 or more), a high strength (an elongation is 10% or more in a three-point bending test and drilling resistance is good), and a high thermostability (a softening point measured by TMA is 70° C. or higher). The optical material such as a lens for two-point frame spectacles is formed by polymerizing and curing a composition for use in an optical resin material containing (a) an inorganic compound having a sulfur atom and/or a selenium atom, (b) an episulfide compound, and (c) a xylylenedithiol compound.Type: GrantFiled: May 10, 2010Date of Patent: October 6, 2015Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Takashi Aoki, Hirohito Ishizuka, Motoharu Takeuchi
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Publication number: 20140378628Abstract: According to the present invention, a composition for optical material, which is capable of providing a homogeneous optical material, can be prepared through pre-polymerization reaction between (a) an inorganic compound having a sulfur atom and (b) an episulfide compound using a hindered amine as a catalyst, followed by mixing with (c) a polythiol compound and (d) a polyisocyanate compound. Moreover, this composition for optical material can be polymerized and cured to thereby provide an optical material having high refractive index (ne of 1.73 or higher), high strength (an elongation of 13% or more in three-point bend test and good drilling resistance), and high heat resistance (a softening point of 70° C. or higher, as measured by TMA).Type: ApplicationFiled: January 30, 2013Publication date: December 25, 2014Inventors: Takashi Aoki, Hirohito Ishizuka, Eiji Koshiishi, Motoharu Takeuchi
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Patent number: 8389671Abstract: The present invention can provide a composition for optical members, which contains (a) a compound having one or more of any group selected from the group consisting of an acryloyl group, a methacryloyl group, an allyl group and a vinyl group and one or more ?-epithiopropyl groups in a molecule. In a preferable embodiment of the present invention, the composition for optical members further contains at least one compound selected from (b) a compound having one or more ?-epithiopropyl groups in a molecule while having no polymerizable unsaturated bond group, (c) an inorganic compound having a sulfur atom and/or a selenium atom, (d) a compound having one or more thiol groups in a molecule, (e) a compound having one or more amino groups in a molecule while having no heterocyclic ring, and (f) a compound having one or more of at least one group selected from the group consisting of a vinyl group, an acryloyl group, a methacryloyl group and an allyl group in a molecule.Type: GrantFiled: March 11, 2008Date of Patent: March 5, 2013Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Motoharu Takeuchi, Hiroshi Horikoshi, Hiroaki Tanaka, Hirohito Ishizuka
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Publication number: 20120142889Abstract: A composition for use in an optical material is disclosed which is capable of providing an optical material satisfying a high refractive index (ne is 1.73 or more), a high strength (an elongation is 10% or more in a three-point bending test and drilling resistance is good), and a high thermostability (a softening point measured by TMA is 70° C. or higher). The optical material such as a lens for two-point frame spectacles is formed by polymerizing and curing a composition for use in an optical resin material containing (a) an inorganic compound having a sulfur atom and/or a selenium atom, (b) an episulfide compound, and (c) a xylylenedithiol compound.Type: ApplicationFiled: May 10, 2010Publication date: June 7, 2012Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Takashi Aoki, Hirohito Ishizuka, Motoharu Takeuchi
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Publication number: 20100130661Abstract: The present invention can provide a composition for optical members, which contains (a) a compound having one or more of any group selected from the group consisting of an acryloyl group, a methacryloyl group, an allyl group and a vinyl group and one or more ?-epithiopropyl groups in a molecule. In a preferable embodiment of the present invention, the composition for optical members further contains at least one compound selected from (b) a compound having one or more ?-epithiopropyl groups in a molecule while having no polymerizable unsaturated bond group, (c) an inorganic compound having a sulfur atom and/or a selenium atom, (d) a compound having one or more thiol groups in a molecule, (e) a compound having one or more amino groups in a molecule while having no heterocyclic ring, and (f) a compound having one or more of at least one group selected from the group consisting of a vinyl group, an acryloyl group, a methacryloyl group and an allyl group in a molecule.Type: ApplicationFiled: March 11, 2008Publication date: May 27, 2010Inventors: Motoharu Takeuchi, Hiroshi Horikoshi, Hiroaki Tanaka, Hirohito Ishizuka