Patents by Inventor Yasuo Kouno

Yasuo Kouno 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).

  • Molecular orientation articles molded from high-molecular weight polyethylene and processes for preparing same
    Patent number: 5302453
    Abstract: In accordance with the present invention, there are provided high molecular weight polyethylene molecular orientation molded articles formed from high molecular weight polyethylenes having a weight average molecular weight of 300,000-600,000, said molecular orientation molded articles having a fineness of not more than 15 deniers, a tensile strength of more than at least 1.7 GPa and satisfying the tensile strength S (GPa)-weight average molecular weight M. (g/mol)-fineness D (denier) relationship represented by the formula [I] ##EQU1## and processes for preparing the same. Further in accordance with the present invention, there are also provided high molecular weight polyethylene molecular orientation molded articles formed from high molecular weight polyethylene having a weight average molecular weight of exceeding 600,000 and satisfying the relationship represented by the formula [II].
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: April 12, 1994
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Yasuo Kouno, Yuichi Itoh, Kazuo Yagi
  • Molecular orientation articles molded from high-molecular weight polyethylene and processes for preparing same
    Patent number: 5252394
    Abstract: In accordance with the present invention, there are provided high molecular weight polyethylene molecular orientation molded articles formed from high molecular weight polyethylenes having a weight average molecular weight of 300,000-600,000, said molecular orientation molded articles having a fineness of not more than 15 deniers, a tensile strength of more than at least 1.7 GPa and satisfying the tensile strength S (GPa)-weight average molecular weight M. (g/mol)-fineness D (denier) relationship represented by the formula [I] ##EQU1## and processes for preparing the same. Further in accordance with the present invention, there are also provided high molecular weight polyethylene molecular orientation molded articles formed from high molecular weight polyethylene having a weight average molecular weight of exceeding 600,000 and satisfying the relationship represented by the formula [II].
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: October 12, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Yasuo Kouno, Yuichi Itoh, Kazuo Yagi
  • Process for injection compression molding
    Patent number: 4489033
    Abstract: A process for injection compression molding ultra high molecular weight polyethylene having an intrinsic viscosity of 3 dl/g or higher measured at 135.degree. C. in decalin and a melt index of 0.01 g/10 min or less comprises,(a) heating the ultra high molecular weight polyethylene to 170.degree.-240.degree. C.,(b) adjusting the volume of the mold cavity V.sub.1 equal to the volume of the molded article V.sub.0,(c) injecting ultra high molecular weight polyethylene having a volume V.sub.0 into the mold cavity through a runner portion at a shear rate of at least 20,000 sec.sup.-1,(d) instantaneously expanding the mold cavity to adjust its volume V.sub.1 to satisfy the relation:1.2 V.sub.0 .ltoreq.V.sub.1at a time from T.sub.1 (immediately before completion of injection) and a time T.sub.
    Type: Grant
    Filed: April 12, 1982
    Date of Patent: December 18, 1984
    Assignee: Mitsui Petrochemical Industries
    Inventors: Naotake Uda, Yasuo Kouno, Tadayoshi Shiomura