Patents by Inventor Hisashi Nagahama

Hisashi Nagahama 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).

  • Method for producing tetrahydrofuran
    Patent number: 9284289
    Abstract: The present invention relates to a method for producing tetrahydrofuran, comprising feeding 1,4-butanediol to a reactor and performing a cyclodehydration reaction in the presence of an acid catalyst to obtain tetrahydrofuran, in which a water concentration in a in-reactor liquid phase is within a range of 1.4 to 10 wt %.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: March 15, 2016
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Ryo Yamashita, Seijiro Nishimura, Hisashi Nagahama
  • METHOD FOR PRODUCING TETRAHYDROFURAN
    Publication number: 20150218117
    Abstract: The present invention relates to a method for producing tetrahydrofuran, comprising feeding 1,4-butanediol to a reactor and performing a cyclodehydration reaction in the presence of an acid catalyst to obtain tetrahydrofuran, in which a water concentration in a in-reactor liquid phase is within a range of 1.4 to 10 wt %.
    Type: Application
    Filed: April 17, 2015
    Publication date: August 6, 2015
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Ryo YAMASHITA, Seijiro NISHIMURA, Hisashi NAGAHAMA
  • POLYESTER POLYOL, POLYURETHANE OBTAINED USING THE SAME, PROCESS FOR PRODUCTION THEREOF, AND MOLDED POLYURETHANE
    Publication number: 20140246621
    Abstract: A process for producing a polyurethane, which comprises using a polyester polyol (a-1), a polyether polyol (b), an isocyanate compound (c) and a chain extender (d) as a raw material to produce a polyurethane, wherein the polyester polyol (a-1) is a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii).
    Type: Application
    Filed: May 9, 2014
    Publication date: September 4, 2014
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Takanori TANIGUCHI, Haruhiko Kusaka, Youko Nagagawa, Daisuke Hirooka, Hisashi Nagahama
  • Polyester polyol, polyurethane, obtained using the same, process for production thereof, and molded polyurethane
    Patent number: 8759467
    Abstract: A process for producing a polyurethane, which comprises using a polyester polyol (a-1), a polyether polyol (b), an isocyanate compound (c) and a chain extender (d) as a raw material to produce a polyurethane, wherein the polyester polyol (a-1) is a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii).
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: June 24, 2014
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takanori Taniguchi, Haruhiko Kusaka, Youko Nakagawa, Daisuke Hirooka, Hisashi Nagahama
  • POLYESTER POLYOL, POLYURETHANE, OBTAINED USING THE SAME, PROCESS FOR PRODUCTION THEREOF, AND MOLDED POLYURETHANE
    Publication number: 20120277394
    Abstract: A process for producing a polyurethane, which comprises using a polyester polyol (a-1), a polyether polyol (b), an isocyanate compound (c) and a chain extender (d) as a raw material to produce a polyurethane, wherein the polyester polyol (a-1) is a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii).
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Takanori TANIGUCHI, Haruhiko Kusaka, Youko Nakagawa, Daisuke Hirooka, Hisashi Nagahama