Patents by Inventor Norifumi Maeda
Norifumi Maeda 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: 20140024793Abstract: Provided is a polyester production process which provides the polyester with a suitable molecular weight capable of enduring various mold processings and which can inhibit the polymer from being colored due to side reactions in synthesis. The above polyester production process comprises: an esterification step of carrying out an esterification reaction of ethylene glycol and 2,5-furandicarboxylic acid to form an oligomer and a condensation polymerization step of carrying out a condensation polymerization reaction of the oligomer to produce polyester, wherein the esterification reaction is carried out at 200 to 250° C.Type: ApplicationFiled: July 19, 2013Publication date: January 23, 2014Inventors: Toshiaki MATSUO, Masayuki KAMIKAWA, Takeyuki KONDO, Norifumi MAEDA
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Patent number: 7204962Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.Type: GrantFiled: February 23, 2001Date of Patent: April 17, 2007Assignee: Hitachi, Ltd.Inventors: Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda, Shuji Yamaguchi
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Patent number: 7179433Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: GrantFiled: February 26, 2004Date of Patent: February 20, 2007Assignee: Hitachi, Ltd.Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Patent number: 7057007Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, a second reactor for polycondensating the oligomer from the first reactor, and a third reactor for further polycondensating the low polymerization product from the second reactor, or followed by a fourth reactor for further polycondensing the polyester from the third reactor. Another third reactor or a plurality of third reactors can be provided in parallel to the third reactor.Type: GrantFiled: March 8, 2002Date of Patent: June 6, 2006Assignee: Hitachi, Ltd.Inventors: Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda, Shuji Yamaguchi
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Publication number: 20040166039Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: ApplicationFiled: February 26, 2004Publication date: August 26, 2004Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Patent number: 6723826Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: GrantFiled: May 28, 2003Date of Patent: April 20, 2004Assignee: Hitachi, Ltd.Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Publication number: 20030208030Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: ApplicationFiled: May 28, 2003Publication date: November 6, 2003Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Patent number: 6590062Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: GrantFiled: September 23, 2002Date of Patent: July 8, 2003Assignee: Hitachi, Ltd.Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Publication number: 20030045671Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: ApplicationFiled: September 23, 2002Publication date: March 6, 2003Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Patent number: 6458916Abstract: An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low polymerization product, and a third reactor for further polycondensating the low polymerization product, thereby producing a high molecular weight polyester, where the second reactor is a vertical, cylindrical polymerization vessel having a plurality of concentrical partitioned reaction compartments therein, each of the reaction compartments being provided with stirring blades and a heater, and an outlet for volatile matters being provided at the upper part of the vessel. The second reactor contributes to efficient and continuous production of polybutylene terephthalate having a good quality.Type: GrantFiled: August 29, 2001Date of Patent: October 1, 2002Assignee: Hitachi, Ltd.Inventors: Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
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Publication number: 20020128399Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.Type: ApplicationFiled: March 8, 2002Publication date: September 12, 2002Inventors: Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda, Shuji Yamaguchi
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Patent number: 6359106Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.Type: GrantFiled: August 22, 2000Date of Patent: March 19, 2002Assignee: Hitachi, Ltd.Inventors: Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda, Shuji Yamaguchi
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Publication number: 20010031231Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.Type: ApplicationFiled: February 23, 2001Publication date: October 18, 2001Inventors: Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda, Shuji Yamaguchi