Patents by Inventor Nelson Black

Nelson Black 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).

  • Controlled comonomer distribution along a reactor for copolymer production
    Patent number: 7053163
    Abstract: The tendency of copolymer fluff grains of propylene and ethylene to agglomerate is reduced by injecting at least one olefin comonomer, such as ethylene monomer, into more than one point along the length of the reactor, rather than injecting all of the ethylene at one point. This process reduces the tendency of copolymer fluff grains to agglomerate and cause processing problems as compared with injecting the comonomer at only one point. Copolymer made by this process is expected to have lower substantially amorphous polypropylene content and better organoleptics than copolymer made where the ethylene is injected at only one point. In one non-limiting embodiment the copolymerization reactor is a loop-type reactor.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: May 30, 2006
    Assignee: Fina Technology, Inc.
    Inventors: Jun Tian, David Rauscher, William Gauthier, Mark C. Douglass, Nelson Black, Ronald Tharappel