Patents by Inventor Tetsunori Higuchi
Tetsunori Higuchi 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: 9765448Abstract: A flame resistant polymer is obtained by reacting polyacrylonitrile with amine and nitro compounds, the polyacrylonitrile being polymerized by aqueous suspension polymerization using a redox initiator and containing an S component at an amount of 3,000 ?g/g or less. A PAN-based polymer in which both yarn producing properties and flame resistance are improved can be realized.Type: GrantFiled: July 11, 2014Date of Patent: September 19, 2017Assignee: The University of TokyoInventors: Tetsunori Higuchi, Mami Sakaguchi
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Publication number: 20160326672Abstract: A polyacrylonitrile (PAN)-based carbon fiber includes three or more phases different in crystal size.Type: ApplicationFiled: December 26, 2014Publication date: November 10, 2016Inventors: Tetsunori Higuchi, Mami Sakaguchi
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Publication number: 20160153121Abstract: A flame resistant polymer is obtained by reacting polyacrylonitrile with amine and nitro compounds, the polyacrylonitrile being polymerized by aqueous suspension polymerization using a redox initiator and containing an S component at an amount of 3,000 ?g/g or less. A PAN-based polymer in which both yarn producing properties and flame resistance are improved can be realized.Type: ApplicationFiled: July 11, 2014Publication date: June 2, 2016Applicant: The University of TokyoInventors: Tetsunori HIGUCHI, Mami SAKAGUCHI
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Patent number: 8043693Abstract: A flame-resistant polymer excels in moldability capable of providing a flame-resistant molded item of novel configuration; a relevant flame-resistant polymer solution; a process for easily producing them; a carbon molding from the flame-resistant polymer; and a process for easily producing the same. A flame-resistant polymer is modified with an amine compound. Further, a flame-resistant polymer solution has the polymer dissolved in a polar organic solvent. A flame-resistant molding whose part or entirety is constituted of the flame-resistant polymer modified with an amine compound. A carbon molding was part or entirety constituted of a carbon component resulting from carbonization of the flame-resistant polymer modified with an amine compound. From the solution containing the flame-resistant polymer, moldings of various configurations can be obtained through further work.Type: GrantFiled: December 9, 2009Date of Patent: October 25, 2011Assignee: Toray Industries, Inc.Inventors: Tetsunori Higuchi, Katsumi Yamasaki, Koichi Yamaoka, Tomihiro Ishida
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Patent number: 7976945Abstract: In a flame resistant fiber assembly obtainable by fiber forming a flame resistant polymer, a flame resistant fiber of a higher performance is obtained by improving fiber forming ability. A carbon fiber of a high performance is obtained by carbonizing the flame resistant fiber. At obtaining a flame resistant fiber by subjecting a solution containing a flame resistant polymer modified by an amine-based compound to a wet spinning or a semi-dry spinning in a coagulation bath in such a way that a degree of swelling of a coagulated yarn at the outlet of the coagulation bath is 100 to 1000 wt % and then, in a bath, subjecting to a drawing and/or water washing and to a drying under tension, the flame resistant fiber is produced by controlling temperature of the drawing bath/water washing bath, drying temperature or tension in such a way that the obtained fiber would not crystallize. A carbon fiber is produced by carbonizing the flame resistant fiber.Type: GrantFiled: August 4, 2006Date of Patent: July 12, 2011Assignee: Toray Industires, Inc.Inventors: Daisuke Kawakami, Tetsunori Higuchi, Katsumi Yamasaki, Tomihiro Ishida, Koichi Yamaoka
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Publication number: 20100086762Abstract: A flame-resistant polymer excels in moldability capable of providing a flame-resistant molded item of novel configuration; a relevant flame-resistant polymer solution; a process for easily producing them; a carbon molding from the flame-resistant polymer; and a process for easily producing the same. A flame-resistant polymer is modified with an amine compound. Further, a flame-resistant polymer solution has the polymer dissolved in a polar organic solvent. A flame-resistant molding whose part or entirety is constituted of the flame-resistant polymer modified with an amine compound. A carbon molding was part or entirety constituted of a carbon component resulting from carbonization of the flame-resistant polymer modified with an amine compound. From the solution containing the flame-resistant polymer, moldings of various configurations can be obtained through further work.Type: ApplicationFiled: December 9, 2009Publication date: April 8, 2010Applicant: TORAY INDUSTRIES, INC.Inventors: Tetsunori Higuchi, Katsumi Yamasaki, Koichi Yamaoka, Tomihiro Ishida
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Patent number: 7655716Abstract: A flame-resistant polymer excelling in moldability capable of providing a flame-resistant molded item of novel configuration; a relevant flame-resistant polymer solution; a process for easily producing them; a carbon molding from the flame-resistant polymer; and a process for easily producing the same. There is provided a flame-resistant polymer modified with an amine compound. Further, there is provided a flame-resistant polymer solution in which the polymer is dissolved in a polar organic solvent. Still further, there is provided a flame-resistant molding whose part or entirety is constituted of the flame-resistant polymer modified with an amine compound. Moreover, there is provided a carbon molding whose part or entirety is constituted of a carbon component resulting from carbonization of the flame-resistant polymer modified with an amine compound. Still further, there is provided a process for producing them.Type: GrantFiled: February 18, 2005Date of Patent: February 2, 2010Assignee: Toray Industries, Inc.Inventors: Tetsunori Higuchi, Katsumi Yamasaki, Koichi Yamaoka, Tomihiro Ishida
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Publication number: 20080299389Abstract: In a flame resistant fiber assembly obtainable by fiber forming a flame resistant polymer, a flame resistant fiber of a higher performance is obtained by improving fiber forming ability. A carbon fiber of a high performance is obtained by carbonizing the flame resistant fiber. At obtaining a flame resistant fiber by subjecting a solution containing a flame resistant polymer modified by an amine-based compound to a wet spinning or a semi-dry spinning in a coagulation bath in such a way that a degree of swelling of a coagulated yarn at the outlet of the coagulation bath is 100 to 1000 wt % and then, in a bath, subjecting to a drawing and/or water washing and to a drying under tension, the flame resistant fiber is produced by controlling temperature of the drawing bath/water washing bath, drying temperature or tension in such a way that the obtained fiber would not crystallize. A carbon fiber is produced by carbonizing the flame resistant fiber.Type: ApplicationFiled: August 4, 2006Publication date: December 4, 2008Applicant: TORAY INDUSTRIES, INC.Inventors: Daisuke Kawakami, Tetsunori Higuchi, Katsumi Yamasaki, Tomihiro Ishida, Koichi Yamaoka
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Publication number: 20070142515Abstract: A flame-resistant polymer excelling in moldability capable of providing a flame-resistant molded item of novel configuration; a relevant flame-resistant polymer solution; a process for easily producing them; a carbon molding from the flame-resistant polymer; and a process for easily producing the same. There is provided a flame-resistant polymer modified with an amine compound. Further, there is provided a flame-resistant polymer solution in which the polymer is dissolved in a polar organic solvent. Still further, there is provided a flame-resistant molding whose part or entirety is constituted of the flame-resistant polymer modified with an amine compound. Moreover, there is provided a carbon molding whose part or entirety is constituted of a carbon component resulting from carbonization of the flame-resistant polymer modified with an amine compound. Still further, there is provided a process for producing them.Type: ApplicationFiled: February 18, 2005Publication date: June 21, 2007Applicant: Toray Industries, Inc. a corporation of JapanInventors: Tetsunori Higuchi, Katsumi Yamasaki, Koichi Yamaoka, Tomihiro Ishida
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Patent number: 5925727Abstract: A material and product excellent in stability in the yarn forming process, small in the color shade contrast due to dyeing, to provide natural irregularity, having microscopic unevenness on the surface of a fabric, to provide dry touch to the eyes and by touch, and good in color fastness are disclosed.The polyamide based fibers of the present invention is a thick and thin yarn in which the unevenness of thickness in the length direction of the polyamide based multifilament is 5 to 20% and in which the standard deviation of the stress at 40% elongation in the stress-strain curve with a sample length of 20 cm is 0.3 g/d or less. The thick and thin yarn can be produced by a process, in which an undrawn polyamide based multifilament of 20.times.10.sup.-3 or less in birefringence .DELTA.n is drawn at a low ratio, comprising the steps of falsely twisting it at a position between a feed roller and a draw roller, drawing from 1.5 to 2.5 times, and thermosetting at 100.degree. C. to 200.degree. C.Type: GrantFiled: October 8, 1997Date of Patent: July 20, 1999Assignee: Toray Industries, Inc.Inventors: Kiyoshi Onda, Tetsunori Higuchi
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Patent number: 5698331Abstract: The present specification discloses a hygroscopic polyester copolymer with a hydrophilic compound copolymerized, containing a cross-linking agent and controlled in moisture absorbing and releasing property, and a fiber using the polyester copolymer. The fiber can be used as a comfortable material for underwear, sports wear, interlinings, etc. as highly hygroscopic woven and knitted fabrics, etc. of high quality.Type: GrantFiled: January 25, 1996Date of Patent: December 16, 1997Assignee: Toray Industries, Inc.Inventors: Yoshitaka Matsumura, Yuko Harashina, Tetsunori Higuchi, Tai Sasamoto