Patents Examined by Sing-Siu Choi
  • Catalyst for the manufacture of polyethylene with a broad or bimodal molecular weight distribution
    Patent number: 6051525
    Abstract: A catalyst composition is described for preparing a high activity catalyst in silica which produces, in a single reactor, polyethylene with a broad or bimodal molecular weight distribution. The catalyst is prepared from the interaction of silica, previously calcined at 600.degree. C., with dibutylmagnesium, 1-butanol and titanium tetrachloride and a solution of methylalumoxane and ethylenebis[1-indenyl]zirconium dichloride.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: April 18, 2000
    Assignee: Mobil Corporation
    Inventors: Frederick Yip-Kwai Lo, Robert I. Mink, Thomas Edward Nowlin, Sandra Denise Schregenberger, Pradeep Pandurang Shirodkar