Patents by Inventor Marijke Verpoest

Marijke Verpoest 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: 7442743
    Abstract: The present invention relates to a process for the production of a propylene polymer in a multistage polymerization process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product which is characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor is having an ethylene content in the range of 0.05 to 0.5 wt %. Furthermore, the invention relates to a propylene polymer obtainable by the inventive process, to a propylene polymer which is characterised in that it comprises ethylene comonomer in an amount of 0.05 to 0.5 wt. %, is having a xylene solubles contents of 3.0 wt.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: October 28, 2008
    Assignee: Borealis Technology Oy
    Inventors: Pirjo Jääskeläinen, Marijke Verpoest, Bert Broeders, Helge Grande
  • Patent number: 7220812
    Abstract: The present invention relates to a process for the production of a propylene polymer in a multistage polymerisation process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product which is characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor is having an ethylene content in the range of 0.05 to 0.5 wt. %. Furthermore, the invention relates to a propylene polymer obtainable by the inventive process, to a propylene polymer which is characterised in that it comprises ethylene comonomer in an amount of 0.05 to 0.5 wt. %, is having a xylene solubles contents of 3.0 wt.
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: May 22, 2007
    Assignee: Borealis Technology Oy
    Inventors: Pirjo Jääskeläinen, Marijke Verpoest, Bert Broeders, Helge Grande
  • Publication number: 20050261415
    Abstract: The present invention relates to a process for the production of a propylene polymer in a multistage polymerisation process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product which is characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor is having an ethylene content in the range of 0.05 to 0.5 wt. %. Furthermore, the invention relates to a propylene polymer obtainable by the inventive process, to a propylene polymer which is characterised in that it comprises ethylene comonomer in an amount of 0.05 to 0.5 wt. %, is having a xylene solubles contents of 3.0 wt.
    Type: Application
    Filed: July 27, 2005
    Publication date: November 24, 2005
    Inventors: Pirjo Jaaskelainen, Marijke Verpoest, Bert Broeders, Helge Grande
  • Publication number: 20040198929
    Abstract: The present invention relates to a process for the production of a propylene polymer in a multistage polymerisation process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product which is characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor is having an ethylene content in the range of 0.05 to 0.5 wt %. Furthermore, the invention relates to a propylene polymer obtainable by the inventive process, to a propylene polymer which is characterised in that it comprises ethylene comonomer in an amount of 0.05 to 0.5 wt. %, is having a xylene solubles contents of 3.0 wt.
    Type: Application
    Filed: May 27, 2004
    Publication date: October 7, 2004
    Inventors: Pirko Jaaskelainen, Marijke Verpoest, Bert Broeders, Helge Grande
  • Publication number: 20030109412
    Abstract: The present invention concerns pelletized propylene homo- or copolymer compositions having an ultra high melt flow rate (MFR) and a process for producing propylene homo- or copolymer fibres. According to the invention, the polymer composition has an MFR2 of 400 g/10 min or more and is obtainable by polymerising propylene at elevated pressure, optionally together with hydrogen and/or comonomers, in the presence of a catalyst in a reaction sequence including at least one bulk reaction zone.
    Type: Application
    Filed: August 19, 2002
    Publication date: June 12, 2003
    Inventors: Kauno Alastalo, Pauli Leskinen, Nancy Noynaert, Marijke Verpoest