Patents by Inventor Kohtaro Matsuo

Kohtaro Matsuo 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).

  • Agent for regulating the motional function of gastrointestinal tract
    Patent number: 4883822
    Abstract: An agent for regulating the motional function of the gastrointestinal tract, which contains as an active ingredient a 41-metyl-4,4a,9,10-tetrahydro-2(3H)-phenanthrenone derivative represented by the following formula I; ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group or an alkoxy group and R.sup.2 represents a hydrogen atom or an alkyl group.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: November 28, 1989
    Assignees: Arakawa Chemical Industries, Ltd., Mistubishi Kasei Corporation
    Inventors: Kohtaro Matsuo, Youichirou Ezaki, Akihiro Tobe, Satoshi Yamazaki, Kozue Enda, Mariko Kitsukawa
  • Stabilized rosin ester and pressure-sensitive adhesive and hot-melt composition based thereon
    Patent number: 4302371
    Abstract: A process for preparing a stabilized rosin ester having a higher softening point which comprises subjecting a rosin to disproportionation and purification, and esterifying the resulting purified disproportionated rosin with a tri- or more valent polyhydric alcohol to give a rosin ester having a softening point (according to ring and ball method) of 65.degree. to 140.degree. C. The resulting rosin ester has superior heat resistance and aging resistance as well as a high softening point and is suitably employed as a tackifier for pressure-sensitive adhesive compositions and hot-melt compositions.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: November 24, 1981
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kohtaro Matsuo, Seiichi Tsuchida
  • Process for disproportionating rosin, poly-unsaturated fatty acids and mixtures thereof
    Patent number: 4271066
    Abstract: This invention provides a process for disproportionating rosin, poly-unsaturated fatty acid or mixture thereof, characterized in that the disproportionation reaction is conducted in the presence of a catalyst comprising (A) at least one iodide selected from the group consisting of sodium iodide and potassium iodide and (B) at least one iron compound selected from the group consisting of iron, iron oxides, iron hydroxides and iron sulfides. The disproportionated product of this invention affords an emulsifier suitable for emulsion polymerization when neutralized with an alkali.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: June 2, 1981
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kohtaro Matsuo, Satoshi Kawamura, Tatsumi Toshine
  • Process for preparing stabilized rosin ester, and pressure-sensitive adhesive composition and hot-melt composition
    Patent number: 4248770
    Abstract: A process for preparing a stabilized rosin ester having a higher softening point which comprises subjecting a rosin to disproportionation and purification, and esterifying the resulting purified disproportionated rosin with a tri- or more valent polyhydric alcohol to give a rosin ester having a softening point (according to ring and ball method) of 65.degree. to 140.degree. C. The resulting rosin ester has superior heat resistance and aging resistance as well as a high softening point and is suitably employed as a tackifier for pressure-sensitive adhesive compositions and hot-melt compositions.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: February 3, 1981
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kohtaro Matsuo, Seiichi Tsuchida