Patents by Inventor Maria Buschermohle

Maria Buschermohle 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).

  • 1-olefin stereoblock polymer, and a process for its preparation
    Patent number: 4849487
    Abstract: Stereoblock polymers of 1-olefins having a broad uni-, bi-, tri- or multimodal molecular weight distribution are obtained when a catalyst which comprises a chiral metallocene containing bridges and an alumoxane is used for the polymerization of the 1-olefins. The polymers are particularly highly suitable for the production of transparent films.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: July 18, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Kaminsky, Maria Buschermohle
  • Process for the preparation of a 1-olefin stereoblock polymer
    Patent number: 4841004
    Abstract: Stereoblock polymers of 1-olefins having long isotactic sequences are obtained at industrially favorable polymerization temperatures using a catalyst which comprises a metallocene compound having cyclopentadienyl radicals which are substituted by chiral groups, and an alumoxane.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: June 20, 1989
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Kaminsky, Maria Buschermohle
  • Process for the preparation of polyolefins
    Patent number: 4769510
    Abstract: In the polymerization of propylene and other higher 1-olefins, polymers which have a high degree of isotacticity and a narrow distribution of molecular weight are obtained in the presence of a catalyst system composed of a zirconium compound which is stereo-rigid and chiral and a linear or cyclic aluminoxane. In addition, the catalyst system is exceptionally active.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: September 6, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Kaminsky, Klaus Kulper, Maria Buschermohle, Hartmut Luker