Patents by Inventor Patricia B. Leng

Patricia B. Leng 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).

  • Process for the preparation of multimodal ABS polymers
    Patent number: 5955540
    Abstract: Rubber-modified monovinylidene aromatic copolymers having an enhanced combination of gloss, toughness and melt flow characteristics are provided by a process wherein a rubber latex having a specified particle size is partially agglomerated, emulsion graft polymerized to a specified graft copolymer to rubber (G/R) ratio and a specified graft copolymer molecular weight and further agglomerated during subsequent dewatering and/or melt compounding operations.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: September 21, 1999
    Assignee: The Dow Chemical Company
    Inventors: Robert P. Dion, David W. Mitchell, Patricia B. Leng
  • Trimodal ABS compositions having good gloss and reduced gloss sensitivity
    Patent number: 5041498
    Abstract: Rubber modified styrene-acrylonitrile (ABS) resins are provided which have three different types of rubber particles. One particle type is a small, emulsion-produced particle and another is a large emulsion-produced particle. The third particle type is a large, mass-polymerized graft copolymer particle which comprisees as its rubbery substrate a diene polymer ingredient containing at least about 80 weight percent of a polymerized diene monomer and which constitutes no more than about 30 weight percent of the total rubber components contained within the compositions of interest. The resulting compositions have very high gloss characteristics and reduced gloss sensitivity to molding condition variations.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: August 20, 1991
    Assignee: The Dow Chemical Company
    Inventors: Marie L. Hare, Patricia B. Leng, Nigel Shields, David E. Henton
  • Multi-layer film structure and electrical cable incorporating same
    Patent number: 4731504
    Abstract: A multi-layered adhesive composition particularly suited for adhesion between metallic substrates and vinyl chloride polymer resins particularly highly plasticized vinyl chloride polymer resins comprising a metal adherent layer, an intermediate layer and a vinyl chloride polymer adherent layer.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: March 15, 1988
    Assignee: The Dow Chemical Company
    Inventors: Felix Achille, Daniel G. Pikula, Patricia B. Leng