Patents by Inventor Donald Andrew White

Donald Andrew White 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).

  • Compatibilized elastomer blends containing grafted polymers of an isoolefin and alkylstyrene
    Patent number: 5700871
    Abstract: A compatibilized polymer blend composition is provided which comprises a mixture of an elastomeric polymer and an acid-grafted polymer of an isomonoolefin and an alkylstyrene such as a blend of EPDM and a maleic anhydride-grafted copolymer of isobutylene and para-methylstyrene.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: December 23, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Palanisamy Arjunan, Donald Andrew White
  • Interpolymer cures of blends comprising halogenated isoolefin/para-alkylstyrene elastomers and unsaturated elastomers
    Patent number: 5656694
    Abstract: Vulcanizable blends containing a halogenated copolymer of a C.sub.4 -C.sub.7 isomonoolefin and para-alkylstyrene mixed with one or more olefinically unsaturated elastomeric polymers are disclosed. Cure is preferably effected using zinc stearate as a curative at levels below about 3.0 phr which gives rise to vulcanizates having selective interpolymer addition of benzylic halogen present in the halogenated copolymer to the double bond of the unsaturated polymer with no significant self curing of the halogenated polymer taking place.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: August 12, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Jean M. J. Frechet, Dongming Li, Kenneth William Powers, Hsien-Chang Wang, Donald Andrew White
  • Multiple reaction process in melt processing equipment
    Patent number: 5651927
    Abstract: Multiple sequential chemical reactions on a polymeric feedstock are carried out in an extruder with multiple reaction zones. Each reaction zone has means for introduction of reagents, for mixing of reagents with polymer and for removal of by/co-products or unreacted reagents.
    Type: Grant
    Filed: June 5, 1996
    Date of Patent: July 29, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Richard Stephen Auda, William Myers Davis, David Yen-Lung Chung, Lawrence William Flatley, Jr., Brenton George Jones, Donald Andrew White, Hans Gerlach Woudboer