Patents by Inventor Philip A. DeFriend

Philip A. DeFriend 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).

  • Multifunctional initiator from divinyl dislane
    Patent number: 5605991
    Abstract: A multifunctional initiator is prepared by contacting an organo-alkali metal compound with a silane represented by the formula: ##STR1## wherein the R' are generally lower alkyl groups such as methyl and the R" is generally an .paren open-st.CH.sub.2 .paren close-st..sub.n group with n=2. Superior results are obtained presumably because of the separation of the vinyl groups and the greater solubility of the compound because of the R' groups. The resulting catalyst initiates polymerization of monomers such as conjugated dienes and monovinyl substituted aromatic compounds to give relatively monodispersed polymers with little or no crosslinking.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: February 25, 1997
    Assignee: Shell Oil Company
    Inventors: Linda R. Chamberlain, Ronald J. Hoxmeier, Philip A. DeFriend
  • Melt metalation of block copolymers
    Patent number: 5276101
    Abstract: A process is provided to functionalize hydrogenated block copolymers of vinyl aromatics and conjugated diolefin in a melt phase. The functionality is predominantly grafted to vinyl aromatic blocks by this process. The process is preferably performed in an extruder.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: January 4, 1994
    Assignee: Shell Oil Company
    Inventors: Linda R. Chamberlain, Philip A. DeFriend