Patents by Inventor Martha H. Robertson

Martha H. Robertson 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).

  • Tackifiers and a process to obtain tackifiers
    Patent number: 5552489
    Abstract: Tackifiers having Mn's of 5,000 or less and Tg's above 0.degree. C. are produced by combining a single site catalyst with an alpha-olefin and a cyclic monomer under conditions designed to produce low molecular weight.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: September 3, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: . Natalie A. Merrill, James M. Farley, Martha H. Robertson, Charles L. Sims, Richard B. Pannell, Angelo A. Montagna
  • Syndiotactic hot melt adhesive
    Patent number: 5317070
    Abstract: A hot melt adhesive including syndiotactic polypropylene having a polymer chain of at least 80% racemic dyads and having a melting point of about 100.degree. C. to 180.degree. C.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: May 31, 1994
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Patrick Brant, Kenneth O. McElrath, Jr., Martha H. Robertson
  • Ternary adhesive compositions
    Patent number: 5010119
    Abstract: An adhesive composition which contains a thermoplastic elastomeric polymer which includes ethylene propylene rubber, ethylene propylene diene monomer, polyisobutylene butyl rubber, ethylene vinyl acetate graft copolymers thereof with C.sub.3 to C.sub.10 unsaturated mono- and polycarboxylic acids, a tackifiying resin and a encapsulated maleated polymer di- or polyamine cross-linking agent having 2-10 carbon atoms, which is useful as a hot melt or pressure sensitive adhesive having enhanced higher temperature properties. Also claimed is the encapsulated polyamine itself. Preferably, the encapsulating material is maleated polypropylene.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: April 23, 1991
    Inventors: Kenneth O. McElrath, Jr., Martha H. Robertson, Wai Yan Chow