Patents by Inventor Daniel H. Willis

Daniel H. Willis 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
  • Promoters in the polymerization of monovinyl-aromatic compounds with primary lithium initiators
    Patent number: 4088813
    Abstract: 1,1-DIALKYLETHYLENES, SUCH AS ISOBUTENE, PROMOTE THE PRIMARY LITHIUM INITIATED POLYMERIZATION OF MONOVINYL-AROMATIC COMPOUNDS, SUCH AS STYRENE, EITHER IN HOMOPOLYMERIZATIONS, OR IN THE FORMATION OF A--B--A block copolymers or (A--B).sub.a Z radial block copolymers, such as by sequential monomer addition with conjugated dienes.
    Type: Grant
    Filed: April 1, 1977
    Date of Patent: May 9, 1978
    Assignee: Phillips Petroleum Company
    Inventor: Daniel H. Willis
  • Promoters in the polymerization of monovinyl-aromatic compounds with primary lithium initiators
    Patent number: 4067929
    Abstract: 1,1-DIALKYLETHYLENES, SUCH AS ISOBUTENE, PROMOTE THE PRIMARY LITHIUM INITIATED POLYMERIZATION OF MONOVINYL-AROMATIC COMPOUNDS, SUCH AS STYRENE, EITHER IN HOMOPOLYMERIZATIONS, OR IN THE FORMATION OF A-B-A block copolymers or (A-B).sub.a Z radial block copolymers, such as by sequential monomer addition with conjugated dienes.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: January 10, 1978
    Assignee: Phillips Petroleum Company
    Inventor: Daniel H. Willis
  • Promoters in the polymerization of monovinyl-aromatic compounds with primary lithium initiators
    Patent number: 3992483
    Abstract: 1,1-DIALKYLETHYLENES, SUCH AS ISOBUTENE, PROMOTE THE PRIMARY LITHIUM INITIATED POLYMERIZATION OF MONOVINYL-AROMATIC COMPOUNDS, SUCH AS SYTRENE, EITHER IN HOMOPOLYMERIZATIONS, OR IN THE FORMATION OF A--B--A block copolymers or (A--B).sub.a Z radial block copolymers, such as by sequential monomer addition with conjugated dienes.
    Type: Grant
    Filed: September 25, 1975
    Date of Patent: November 16, 1976
    Assignee: Phillips Petroleum Company
    Inventor: Daniel H. Willis