Patents by Inventor Päivi Huovinen

Päivi Huovinen 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: 6875826
    Abstract: The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and comprising a high molar mass portion and a low or medium molar mass portion. The polymers are produced by subjecting propylene and optionally other olefins to polymerization in a plurality of polymerization reactors connected in series, employing different amounts of hydrogen as a molar mass modifier in at least two of the reactors, and carrying out the polymerization reaction in the presence of a catalyst system capable of catalyzing the formation of a high molar mass polymerization product having a MFR2 of less than 0.1 g/l0 min and a low or medium molar mass polymerization product having a MFR2 of more than 0.5 g/10 min.
    Type: Grant
    Filed: September 28, 1998
    Date of Patent: April 5, 2005
    Assignee: Borealis A/S
    Inventors: Päivi Huovinen, Ali Harlin, Pirjo Jääskeläinen, Amir Karbasi, Nina Manner
  • Patent number: 6576710
    Abstract: The invention relates to the preparation of an &agr;-olefin polymer product having controlled stereoregularity, comprising the successive step of: (i) producing a first polymerization product by contacting under polymerization conditions an &agr;-olefin monomer with a polymerization catalyst system comprising a transition metal compound, a first organometal compound and a stereoregulating external electron donor to give a first polymerization reaction mixture; (ii) producing a second polymerization product by contacting additional &agr;-olefin monomer with the first polymerization reaction mixture. The controlled stereoregularity is achieved in such a way that in step (ii) the second polymerization product is produced in the presence of a stereoregularity controlling agent. The stereoregularity controlling agent e.g. a second organometal compound which contains, on an atom basis, more halogen per metal than the first organometal compound, or 0.01-1.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: June 10, 2003
    Assignee: Borealis Technology Oy
    Inventors: Päivi Huovinen, Pauli Leskinen, Thomas Garoff
  • Patent number: 6503993
    Abstract: The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23° C. of less than 2.5%, a crystallization temperature of over 124 ° C. and a tensile modulus of greater than 2,000 MPa. These polymers can be prepared by nucleating a propylene polymer with a polymeric nucleating agent containing vinyl compound units, and by polymerizing propylene optionally with comonomers in the presence of a Ziegler-Natta catalyst system primarily transesterified with a phthalic acid ester—a lower alcohol pair to provide said propylene polymer. The catalyst contains a strongly coordinating external donor.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: January 7, 2003
    Assignee: Borealis Technology Oy
    Inventors: Päivi Huovinen, Pirjo J{umlaut over (aa)}skeläinen, Amir Karbasi, Christer Lind, Bo Malm, John Haugen