Patents by Inventor Tetsushi Ichikawa

Tetsushi Ichikawa 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).

  • Modified cyclic aliphatic polyamine
    Patent number: 7572877
    Abstract: An object of the present invention is to provide a modified cyclic aliphatic polyamine having a low viscosity and a small content of unreacted polyamine which can provide, when it is used as a curing agent for epoxy resin, an epoxy resin composition having an improved workability without adding solvent or diluent and an excellent property of epoxy resin cure product. The above modified cyclic aliphatic polyamine is obtained by addition reaction of a cyclic aliphatic polyamine such as isophoronediamine and norbornanediamine and an alkenyl compound such as styrene. The modified cyclic aliphatic polyamine thus obtained is added in epoxy resin to be used as a curing agent for epoxy resin.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: August 11, 2009
    Assignee: Mitsubishi Gaschemical Company, Inc.
    Inventors: Takeshi Koyama, Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Modified cyclic aliphatic polyamine
    Publication number: 20080090990
    Abstract: An object of the present invention is to provide a modified cyclic aliphatic polyamine having a low viscosity and a small content of unreacted polyamine which can provide, when it is used as a curing agent for epoxy resin, an epoxy resin composition having an improved workability without adding solvent or diluent and an excellent property of epoxy resin cure product. The above modified cyclic aliphatic polyamine is obtained by addition reaction of a cyclic aliphatic polyamine such as isophoronediamine and norbornanediamine and an alkenyl compound such as styrene. The modified cyclic aliphatic polyamine thus obtained is added in epoxy resin to be used as a curing agent for epoxy resin.
    Type: Application
    Filed: October 22, 2007
    Publication date: April 17, 2008
    Inventors: Takeshi Koyama, Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Modified cyclic aliphatic polyamine
    Patent number: 7301053
    Abstract: An object of the present invention is to provide a modified cyclic aliphatic polyamine having a low viscosity and a small content of unreacted polyamine which can provide, when it is used as a curing agent for epoxy resin, an epoxy resin composition having an improved workability without adding solvent or diluent and an excellent property of epoxy resin cure product. The above modified cyclic aliphatic polyamine is obtained by addition reaction of a cyclic aliphatic polyamine such as isophoronediamine and norbornanediamine and an alkenyl compound such as styrene. The modified cyclic aliphatic polyamine thus obtained is added in epoxy resin to be used as a curing agent for epoxy resin.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: November 27, 2007
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takeshi Koyama, Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Amino composition and process for producing the same
    Patent number: 6908982
    Abstract: An object of the present invention is to provide an amino composition which provides, when used as a curing agent for epoxy resin, a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition. The amino composition is obtained by addition reaction of diamine such as metaxylylenediamine and 1,3-bis(aminomethyl) cyclohexane and styrene, wherein the content of the diamine is less than 15% by weight based upon the total weight of the amino composition and the content of 1-addition product of having one phenethyl group is 50 to 100% by weight based upon the total weight of amino compound(s) obtained by the addition reaction.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: June 21, 2005
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Modified cyclic aliphatic polyamine
    Publication number: 20040106684
    Abstract: An object of the present invention is to provide a modified cyclic aliphatic polyamine having a low viscosity and a small content of unreacted polyamine which can provide, when it is used as a curing agent for epoxy resin, an epoxy resin composition having an improved workability without adding solvent or diluent and an excellent property of epoxy resin cure product. The above modified cyclic aliphatic polyamine is obtained by addition reaction of a cyclic aliphatic polyamine such as isophoronediamine and norbornanediamine and an alkenyl compound such as styrene. The modified cyclic aliphatic polyamine thus obtained is added in epoxy resin to be used as a curing agent for epoxy resin.
    Type: Application
    Filed: September 25, 2003
    Publication date: June 3, 2004
    Inventors: Takeshi Koyama, Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Amino composition and process for producing the same
    Publication number: 20040044176
    Abstract: An object of the present invention is to provide an amino composition which provides, when used as a curing agent for epoxy resin, a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition. The amino composition is obtained by addition reaction of diamine such as metaxylylenediamine and 1,3-bis (aminomethyl) cyclohexane and styrene, wherein the content of the diamine is less than 15% by weight based upon the total weight of the amino composition and the content of 1-addition product of having one phenethyl group is 50 to 100% by weight based upon the total weight of amino compound(s) obtained by the addition reaction.
    Type: Application
    Filed: June 18, 2003
    Publication date: March 4, 2004
    Inventors: Tetsushi Ichikawa, Hisayuki Kuwahara, Masatoshi Echigo
  • Amino compound and process for producing the same
    Patent number: 6562934
    Abstract: An amino compound obtained by addition reaction of diamine represented by the following formula (1) and an alkenyl compound and a process for producing the same. H2N—H2C—A—CH2—NH2  (1) wherein A is a phenylene group or a cyclohexylene group.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: May 13, 2003
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shinichi Yonehama, Tetsushi Ichikawa
  • Amino compound and process for producing the same
    Publication number: 20020055605
    Abstract: An amino compound obtained by addition reaction of diamine represented by the following formula (1) and an alkenyl compound and a process for producing the same.
    Type: Application
    Filed: September 10, 2001
    Publication date: May 9, 2002
    Applicant: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shinichi Yonehama, Tetsushi Ichikawa
  • Hardening agent for epoxy resins comprising an amideamine compound
    Patent number: 4541958
    Abstract: A hardening agent for epoxy resins comprising an amideamine compound which is a reaction product between (A) a polyamine mainly comprising a compound represented by the formula: ##STR1## wherein n represents 1 or 2, which is obtained by reacting m-xylylenediamine and epichlorohydrin, and (B) a carboxylic acid.
    Type: Grant
    Filed: May 23, 1983
    Date of Patent: September 17, 1985
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Akira Miyamoto, Katsuo Sato, Tetsushi Ichikawa, Masahiro Kurokawa