Patents by Inventor Mario Matteoli

Mario Matteoli 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 preparing polypropylene compositions having high impact strength at low temperatures
    Patent number: 4113802
    Abstract: There is disclosed a new and improved process for preparing compositions consisting for at least 50% by weight of isotactic polypropylene and having high impact strength at low temperatures.The process comprises three or more steps. In the first step propylene is polymerized in an inert liquid hydrocarbon medium and in contact with a stereospecific catalyst prepared by mixing a titanium trihalide with a dialkyl aluminum monohalide to obtain a slurry. In subsequent steps ethylene, or an ethylene/propylene mixture, is fed to the polymerization suspension of first step and the polymerization is continued until the amount of ethylene polymerized is, at most, 20% by weight of the total, final polymeric composition obtained.
    Type: Grant
    Filed: December 29, 1976
    Date of Patent: September 12, 1978
    Assignee: Montedison S.p.A.
    Inventors: Mario Matteoli, Luciano Luciani