Patents by Inventor Tamotsu Ishida

Tamotsu Ishida 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).

  • Phenolic resin molding material
    Patent number: 5691409
    Abstract: The present invention provides a phenolic resin molding material high in flowability and heat stability in the molten state and excellent in curability at high temperatures which contains (a) a high ortho-novolak type phenolic resin having a number-average molecular weight of 350-500 and an ortho-bond/para-bond ratio of 1.5-2.5, (b) hexamethylene-tetramine, (c) a low-molecular polyolefin compound and (d) a filler. This phenolic resin molding material can further contain a crystalline phenolic compound having two or more benzene rings and/or a monohydric aliphatic alcohol to further improve the flowability, heat stability and curability.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: November 25, 1997
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Tamotsu Ishida, Masatoshi Yamoto
  • Process for injection molding of phenolic resin molding material
    Patent number: 5679305
    Abstract: The present invention provides a process for injection molding a phenolic resin molding material which includes injection molding a phenolic resin molding material having a melt viscosity of 10.sup.4 Pa.cndot.s or lower, preferably 10.sup.3 Pa.cndot.s or lower at 100.degree. C. by an injection molding machine having a screw of 1.5 or higher in compression ratio and/or provided with a back-flow stopping ring at the tip portion of the screw.According to the present invention, it is possible to carry out injection molding of phenolic resin molding materials with injection molding machines generally used for molding of thermoplastic resins by employing phenolic resin molding materials which are low in viscosity in molten state. Furthermore, the injection molding can be carried out under relatively low pressure and thus, occurrence of flash can be inhibited.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: October 21, 1997
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Tamotsu Ishida, Eiji Funatsu
  • Phenolic resin molding material including a crystalline phenolic compound having plural hydroxyphenyl groups and a compound having plural hydroxyl groups in a benzene ring
    Patent number: 5571854
    Abstract: A phenolic resin molding material for molding at lower than normal pressures, comprising as resin components a combination of (A) a crystalline phenolic compound having two or more hydroxyphenyl groups and (B) a compound having two or more hydroxyl groups in the benzene ring, or (A), (B) and (C) a phenolic resin.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: November 5, 1996
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Tamotsu Ishida, Tsukasa Sakamoto, Hidenori Saito