Patents by Inventor Shaotian Wang

Shaotian Wang 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 polymerization process
    Patent number: 6255415
    Abstract: A gas phase copolymerization of ethylene is disclosed. The process uses a supported single-site catalyst that contains a heteroatomic ligand and produces polyethylene that has a reduced density. Suitable heteroatomic ligands include boraaryl, azaborolinyl, pyridinyl, pyrrolyl, indolyl, carbazolyl and quinolinyl.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: July 3, 2001
    Assignee: Equistar Chemicals, L.P.
    Inventors: Shaotian Wang, Jia-Chu Liu, Mark P. Mack, Clifford C. Lee
  • Supported olefin polymerization catalysts
    Patent number: 6211311
    Abstract: A supported olefin polymerization catalyst system and a method of making it are disclosed. The catalyst system comprises: (a) a support chemically treated with an organoaluminum, organosilicon, organomagnesium, or organoboron compound; (b) a single-site catalyst that contains a polymerization-stable, heteroatomic ligand; and (c) an activator. Chemical treatment is a key to making supported heterometallocenes that have high activity and long shelf-lives, and can effectively incorporate comonomers.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: April 3, 2001
    Assignee: Equistar Chemicals, L.P.
    Inventors: Shaotian Wang, Bradley P. Etherton, Karen E. Meyer, Michael W. Lynch, Linda N. Winslow, Leonard V. Cribbs, Jia-Chu X. Liu