Patents by Inventor Norbert Hafner

Norbert Hafner 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).

  • Patent number: 6103655
    Abstract: Procedure for the preparation of a solid carrier for olefin polymerization catalysts, comprising the steps:a) impregnating a silica with Mg-chloride solubilized in ethylbenzoate, in the presence of further electron donors,b) optionally drying the impregnated silica obtained in (a) and impregnating it with a solution of Mg-alkyls in SiCl.sub.4 at a temperature from -10 to 20.degree. C. and subsequently treating the obtained slurry at a temperature from 40.degree. C. to reflux temperature, optionally adding a further amount of electron donors,c) drying the obtained carrier.The carrier which is obtained according to the above procedure is advantageously used for the preparation of supported catalysts for the polymerization of olefins.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: August 15, 2000
    Assignee: Borealis GmbH
    Inventors: Luciano Luciani, Wolfgang Neissl, Norbert Hafner
  • Patent number: 6096681
    Abstract: Procedure for the preparation of a solid carrier for olefin polymerization catalysts, comprising the steps:a) impregnating a silica with a solution of Mg-chloride in the presence of electron donors,b) drying the impregnated silica obtained in (a) and impregnating it with a solution of Mg-alkyls in SiCl.sub.4 at a temperature from -10 to 20.degree. C., optionally adding a further amount of electron donors,c) subsequently treating the slurry obtained in (b) at a temperature from 40.degree. C. to reflux temperature,d) drying the carrier obtained in (c).
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: August 1, 2000
    Assignee: Borealis GmbH
    Inventors: Luciano Luciani, Wolfgang Neissl, Norbert Hafner
  • Patent number: 5705568
    Abstract: New polypropylenes which are obtained by chemical degradation of elastic polypropylenes using organic peroxides.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: January 6, 1998
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Markus Gahleitner, Klaus Bernreitner, Norbert Hafner, Rudolf Wolfer, Wolfgang Neissl
  • 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
  • Patent number: 5665820
    Abstract: Elastomeric polypropylenes modified by grafting and blends thereof with isotactic polypropylenes modified by grafting, and the use thereof as compatibilizers or adhesion promoters for blends and metal composites.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: September 9, 1997
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Dirk Leistner, Manfred Ratzsch, Achim Hesse, Norbert Hafner, Markus Gahleitner, Klaus Bernreitner
  • Patent number: 5629255
    Abstract: Highly active catalysts, for olefin polymerization, from tetraneophylzirconium and partly hydroxylated metal oxides from group IIa, IIIa, IVa or IVb of the Periodic Table, which are essentially free from by-products.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: May 13, 1997
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Norbert Hafner, Wilfried T oltsch, Hans Ledwinka, Wolfgang Neissl
  • Patent number: 5596076
    Abstract: Process for the preparation of elastomeric, non-agglomerated, powdery/crumbly polypropylene by polymerization of propylene, if appropriate together with other olefins as comonomers, in liquid propylene and subsequent precipitation of the polypropylenes formed with CO.sub.2 or a polar solvent of which the polar term "delta p" of the solubility parameter according to Hansen is greater than 5 and the total solubility parameter "delta" is less than 30.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: January 21, 1997
    Assignee: PCD Polymere Gesellschaft m.b.H.
    Inventors: Norbert Hafner, Friedrich Mitter, Hans Ledwinka, Elisabeth Bruckm uller, Josef Kurz