Patents Assigned to Exxon Chemical Products Inc.
  • Deactivation of drier material for olefin reactions
    Patent number: 5396021
    Abstract: A process for reducing the loss of monomers from a polymerization recycle stream comprising steam treating a molecular sieve used to dry the recycle stream to remove acidic sites within the sieve. The steam treatment is conducted at a temperature of between 150.degree. C. and 300.degree. C. for 2 to 24 hours.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: March 7, 1995
    Assignee: Exxon Chemical Products Inc.
    Inventors: William G. DePierri, Michael F. McDonald, Jr., Albert E. Schweizer
  • Viscosity modifer polymers
    Patent number: 5310490
    Abstract: The present invention relates to hydrogenated block copolymers of butadiene and at least one other diene, preferably isoprene. The copolymer is hydrogenated and comprises at least 10% by weight of at least one crystallizable segment and at least one low crystallinity segment.
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: May 10, 1994
    Assignee: Exxon Chemical Products Inc.
    Inventors: Mark J. Struglinski, Gary W. Ver Strate, Lewis J. Fetters