Patents by Inventor Shunji Ehara

Shunji Ehara 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).

  • 2,7-dihydroxynaphthalene based epoxy resin, intermediate thereof, processes for producing them, and epoxy resin composition
    Patent number: 5302672
    Abstract: A 1,1-bis(2,7-diglycidyloxy-1-naphthyl)alkane as an epoxy resin; a 1,1-bis(2,7-dihydroxy-1-naphthyl)alkane as an intermediate for said epoxy resin; a process for producing said intermediate comprising reacting 2,7-dihydroxy-1-naphthalene and an aldehyde; a process for producing said epoxy resin comprising reacting said intermediate and an epihalohydrin; and an epoxy resin composition comprising said epoxy resin and a curing agent. The epoxy resin has a low melt viscosity while exhibiting excellent heat resistance.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: April 12, 1994
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Ichiro Ogura, Shunji Ehara, Taku Kitamura, Hiroshi Sakata
  • Novel epoxy resin compositions
    Patent number: 4687832
    Abstract: An epoxy resin composition comprising an epoxy resin and a curing agent for said resin and optionally a curing accelerator, the improvement of which the epoxy resin is an epoxy resin obtained by reacting dihydroxynaphthalene of formula ##STR1## with epichlorohydrin.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: August 18, 1987
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Shunji Ehara, Shuji Nakamura, Masato Akama