Patents by Inventor Ralph C. Farrar

Ralph C. Farrar 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).

  • Suppressing gel in the continuous solution polymerization of a conjugated diene with a monovinyl aromatic compound
    Patent number: 4091198
    Abstract: Gel formation in the first reactor means of a multireactor process is suppressed by the employment of a silicon halide in the first reactor means in an organolithium-initiated, solution-polymerized, randomized, conjugated diene/monovinyl-substituted aromatic compound copolymerization.
    Type: Grant
    Filed: September 10, 1976
    Date of Patent: May 23, 1978
    Assignee: Phillips Petroleum Company
    Inventors: Richard L. Smith, Ralph C. Farrar, Daniel H. Willis
  • Addition of coupling agent during organolithium initiated polymerizations
    Patent number: 4020258
    Abstract: Continuous or incremental addition of a coupling agent, such as silicon tetrachloride, during the polymerization step of organolithium initiated polymerization processes results in polymers of improved processability, as well as other improved properties such as high green strength, low die swell, and minimal shrinkage on extrusion.
    Type: Grant
    Filed: March 1, 1974
    Date of Patent: April 26, 1977
    Assignee: Phillips Petroleum Company
    Inventor: Ralph C. Farrar
  • Viscosity reduction of organopolylithium-initiated polymer solutions
    Patent number: 4004070
    Abstract: The viscosity of organopolylithium-initiated polymer solutions is reduced by introducing into the polymerization reaction after the polymerization reaction is at least 80 percent complete, an organomonolithium compound.
    Type: Grant
    Filed: March 27, 1972
    Date of Patent: January 18, 1977
    Assignee: Phillips Petroleum Company
    Inventor: Ralph C. Farrar
  • Polymerization process for producing low cis-configuration homopolymers
    Patent number: 3948872
    Abstract: A polymerization process for preparing homopolymers of conjugated dienes having decreased cis-content resulting from the use of organolithium compounds as initiators wherein 1,2-dialkoxybenzene is introduced in a quantity sufficient to decrease the cis-content of the homopolymers formed.
    Type: Grant
    Filed: January 25, 1971
    Date of Patent: April 6, 1976
    Assignee: Phillips Petroleum Company
    Inventors: William J. Trepka, Ralph C. Farrar