Patents by Inventor Nobuaki Sakurai

Nobuaki Sakurai 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).

  • Ethylene polymers
    Patent number: 5693719
    Abstract: An ethylene polymer which is useful for molding inflation film having a particularly excellent moldability is provided.The ethylene polymer is obtainable by the first and second steps and satisfying the following conditions (a) to (d):(a) the polymer produced in the first polymerization step having an weight average molecular weight (Mw,.sub.1) in the range of 6.times.10.sup.5 to 4.times.10.sup.6 ;(b) the ratio (Mw,.sub.2 /Mw,.sub.1) of the weight average molecular weight of the polymer produced in the first polymerization step (Mw,.sub.1) and the weight average molecular weight of the polymer produced in the second polymerization step (Mw,.sub.2) being in the range of 0.7 to 1.4;(c) the molecular weight in which the integration fraction from the low molecular weight is equal to 1/2 of the weight fraction (W.sub.2) of the polymer produced in the second polymerization step being in the range of 5.times.10.sup.3 to 3.times.10.sup.4 ; and(d) the weight fraction (W.sub.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: December 2, 1997
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yukitaka Goto, Nobuaki Sakurai, Tadashi Takahashi, Katsumi Hirakawa, Yoichi Maeda, Yoshihiko Sasaki, Satoshi Nishimura, Masataka Souda