Patents by Inventor Doulgas J. McLain

Doulgas J. McLain 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).

  • Process for producing polymers with multimodal molecular weight distributions
    Patent number: 5648438
    Abstract: The invention provides a continuous process for catalytically polymerizing a monomer feed of ethylene and at least one comonomer which comprises introducing a catalyst including a bulky ancillary ligand transition metal compound and monomer feed in an upstream reaction zone for polymerization, introducing further catalyst in a downstream reaction zone for further polymerization, the peak temperature in the downstream reaction zone being at least 50.degree. C. higher than in the upstream zone and being above 150.degree. C. The process economically produces polymer of good properties which is melt processable.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: July 15, 1997
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: David T. Henry, Doulgas J. McLain, Joseph D. Domine, Aspy Keki Mehta, William Joseph Zafian, Norbert Baron, Bernard J. Folie