Patents by Inventor Kurt Hammerschmid

Kurt Hammerschmid 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).

  • Polypropylenes having a reduced tendency to white fracture
    Patent number: 5686533
    Abstract: Polypropylenes having a reduced tendency to white fracture, which containA) from 70 to 95% by weight of a highly isotactic polypropylene having anisotactic index of more than 90 and a melt flow index between 0.1 and 100 g/10 min, it being possible for the polypropylene to be a homopolymer of propylene or a copolymer of propylene with one or more .alpha.-olefins, having a propylene content of at least 50 mol %, andB) from 5 to 30% by weight of a highly amorphous polypropylene having a crystalline polypropylene fraction of up to 10% by weight with an enthalpy of fusion of not more than 40 J/g and a melt flow index between 0.1 and 100 g/10 min, it being possible for the polypropylene to be a homopolymer of propylene or a copolymer of propylene with one or more .alpha.-olefins, having a propylene content of at least 80 mol %.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: November 11, 1997
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Markus Gahleitner, Klaus Bernreitner, Norbert Hafner, Kurt Hammerschmid, Hermann Heinemann