Patents by Inventor Michael Schreck

Michael Schreck 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).

  • Peelable, heat-sealable, multilayer polyolefinic film, process for the production thereof, and the use thereof
    Patent number: 5716698
    Abstract: The invention relates to a peelable, oriented, opaque, multilayer polyolefin film comprising at least one opaque layer and a peelable top layer. All layers of the film are essentially vacuole-free. The opaque layer contains pigments having a mean particle diameter of from 0.01 to 1 .mu.m.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: February 10, 1998
    Assignee: Hoecht Aktiengesellschaft
    Inventors: Michael Schreck, Thomas Dries, Ursula Murschall, Dieter Scheidecker, Adolf Wilhelm
  • Process for the preparation of a polypropylene molding composition
    Patent number: 5708090
    Abstract: Process for the preparation of a polypropylene molding compositionA propylene block copolymer having good flow properties and a very good low temperature impact strength is obtained in a high yield if a catalyst which consists of a chiral metallocene, containing a bridge, of the formula I ##STR1## and an aluminoxane is used for the polymerization of propylene and the comonomers.The polymerization is carried out in two stages, a crystalline propylene polymer being prepared in the first stage.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 13, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Schreck, Andreas Winter, Volker Dolle, Hartmut Kondoch, Martin Antberg, Jurgen Rohrmann
  • Heat-sealable or non-heat-sealable, oriented, layered olefin polymer film comprising amorphous polymer particles
    Patent number: 5693414
    Abstract: The disclosed oriented, multilayer olefin polymer film comprises a polyolefinic base layer and at least one heat-sealable or non-heat-sealable top layer. The top layer contains at least one olefin polymer and at least one amorphous polymer which is in the olefin polymer in the form of separated or discrete, substantially non-agglomerated particles. The discrete, substantially non-agglomerated particles form during the coextrusion process for the production of the multilayer film. The film is useful for printing, lamination, and packaging.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: December 2, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Peiffer, Thomas Dries, Ursula Murschall, Michael Schreck
  • Process for the preparation of a polypropylene molding composition
    Patent number: 5322902
    Abstract: A propylene block copolymer having good flow properties and a very good low temperature impact strength is obtained in a high yield if a catalyst which consists of a chiral metallocene, containing a bridge, of the formula I ##STR1## and an aluminoxane is used for the polymerization of propylene and the comonomers.The polymerization is carried out in two stages, a crystalline propylene polymer being prepared in the first stage.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: June 21, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Schreck, Andreas Winter, Volker Dolle, Hartmut Kondoch, Martin Antberg, Jurgen Rohrmann
  • Process for the preparation of a polypropylene molding composition
    Patent number: 5280074
    Abstract: A propylene block copolymer having good flow properties and a very good low temperature impact strength is obtained in a high yield if a catalyst which consists of a chiral metallocene, containing a bridge, of the formula I ##STR1## and an aluminoxane is used for the polymerization of propylene and the comonomers.The polymerization is carried out in two stages, a crystalline propylene polymer in liquid monomers being prepared in the first stage and a copolymer in the gas phase being prepared in the second stage.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: January 18, 1994
    Assignee: Hoechst AG
    Inventors: Michael Schreck, Andreas Winter, Walter Spaleck, Hartmut Kondoch, Jurgen Rohrmann
  • Process for the preparation of a polypropylene
    Patent number: 5100981
    Abstract: In the process according to the invention for the preparation of a polypropylene, a catalyst system is used which is based on the product of the reaction of a magnesium halide with an electron donor and a tetravalent titanium compound, a halogen-free organoaluminum compound and two different organosilicon compounds as stereo-regulator. Propylene homopolymers and copolymers having a very narrow molecular weight distribution and high isotacticity are obtained in high yields. The polymers are suitable, in particular, for injection molding.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: March 31, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Schreck, Volker Dolle