Patents by Inventor Harri Hokkanen

Harri Hokkanen 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: 7323525
    Abstract: Polymers of propylene with one or two olefin comonomers are produced through the use of a polymerization catalyst supported on a carrier produced by spray crystallization and having a maximum dimension of 55 ?m. Copolymers of superior properties are obtained, and the production process is de-snagged.
    Type: Grant
    Filed: October 2, 2002
    Date of Patent: January 29, 2008
    Assignee: Siemens Aktiengesellschaft
    Inventors: Kauno Alastalo, Päivi Pitkänen, Marita Sutela, Lucas Pelckmans, Harri Hokkanen
  • Publication number: 20050009957
    Abstract: Polymers of propylene with one or two olefin comonomers are produced through the use of a poymerisation catalyst supported on a carrier produced by spray crystallisation and having a maximum dimension of ?m. Copolymers of superior properties are obtained, and the production process is de-snagged.
    Type: Application
    Filed: October 2, 2002
    Publication date: January 13, 2005
    Inventors: Kauno Alastalo, Paivi Pitkanen, Marita Sutela, Lucas Pelckmans, Harri Hokkanen
  • Patent number: 6780809
    Abstract: A particulate, modified chromium oxide catalyst for the polymerisation of ethylene or ethylene with &agr;-olefins, comprising: a) a chromium-oxide catalyst, b) a transition metal compound, and c) a catalyst activator. A method for the preparation of the catalyst comprises the steps of: a) subjecting a chromium oxide catalyst precursor, which comprises a chromium oxide compound combined with an inorganic support, to a temperature in the range of from 400 to 950° C.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: August 24, 2004
    Assignee: Borealis Technology Oy
    Inventors: Arild Follestad, Vidar Almquist, Ulf Palmqvist, Harri Hokkanen
  • Patent number: 6632884
    Abstract: This invention concerns process for producing polyethylene compositions, films prepared thereof and process for the preparation of the films. The process comprises subjecting ethylene, optionally hydrogen and comonomers to polymerization or copolymerization reactions in a multistage polymerization. At least one polymerization stage is conducted essentially in the absence of hydrogen. The polymerization reactions are carried out in the presence of a single-site catalyst capable of forming a composition comprising a low molecular weight component with MFR2 of at least 10 g/10 min and a density higher than the density of the composition and a high molecular weight component. The melt flow rate of the composition is in the range MFR2=0.1-5.0 g/10 min and the density of the composition is 915-960 kg/m3. The invention makes it possible to produce polyethylene compositions for manufacturing films with a good balance between optical and mechanical properties.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: October 14, 2003
    Assignee: Borealis Technology Oy
    Inventors: Merete Skar, Ole Jan Myhre, Arja Lehtinen, Harri Hokkanen, Hilkka Knuuttila, Kalle Kallio, Esa Kinnunen, Eija Lappi
  • Patent number: 6500780
    Abstract: The present invention concerns a method for preparing heterogeneous catalysts. According to the method, preparation is carried out under such process conditions in which the bonding of compounds from the gas phase onto the surface of a support material is primarily determined by the properties of the support surface. The constituents contained in the reagent are then selectively bonded to the bonding sites of the support material surface, thus forming stable surface bonds. According to the invention, the number of surface-bond sites available for preparing a stable product with surface bonds is controlled by varying the reaction temperature and/or selecting a suitable reagent. The invention makes it possible to control the metal content of the end product at a predetermined level.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: December 31, 2002
    Assignee: Neste Oy
    Inventors: Tuomo Suntola, Suvi Haukka, Arla Kytökivi, Eeva-Liisa Lakomaa, Marina Lindblad, Jukka Hietala, Harri Hokkanen, Hilkka Knuuttila, Pekka Knuuttila, Outi Krause, Lars Peter Lindfors
  • Patent number: 6451725
    Abstract: Method for preparing a catalyst component for homo or copolymerization of olefins, said catalyst component comprising at least one metallocene compound on porous inorganic carrier, wherein said metallocene compound is mixed as pure compound in the absence of solvents with said carrier at a temperature which is at least 50° C. but below the vaporization temperature of the metallocene compound in reactor conditions for a sufficient time to obtain said catalyst component having said metallocene evenly distributed onto carrier particles.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: September 17, 2002
    Assignee: Borealis Technology Oy
    Inventors: Hilkka Knuuttila, Harri Hokkanen, Eija Salo
  • Patent number: 6284849
    Abstract: A method for transitioning between two different catalysts in olefin polymerizations, a first catalyst and a second catalyst, comprising the steps of: discontinuing the feed of the first catalyst into the polymerization reactor, and introducing the second catalyst into the reactor, wherein the transition is performed between a chromium-based catalyst and a metallocene catalyst.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: September 4, 2001
    Assignee: Borealis A/S
    Inventors: Vidar Almquist, Tone Aastad, Ingrid Sorum Melaaen, Harri Hokkanen, Kalle Kallio
  • Patent number: 6225423
    Abstract: The invention relates to a novel olefin polymerization catalyst system comprising a reaction product of a transition metal compound. A stable and active single active site catalyst is obtained by producing said reaction product by: (I) contacting in an organic solvent the following reactive components (a) a transition metal compound, which is at least partially soluble in the organic solvent and contains in its molecule at least one organic group and a transition metal chosen from periods 4-7 and groups 3-10 of the Periodic Table (IUPAC 1990), and (b) 0.05-500 moles of an unsaturated organic compound per mole of transition metal of the transition metal compound, which unsaturated organic compound is at least partially soluble in the organic solvent, has in its molecule 2-30 carbon atoms and at least one terminal double bond,  to obtain a reaction product dissolved in the organic solvent; and (II) recovering the reaction product of the transition metal compound.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: May 1, 2001
    Assignee: Borealis Technolgy Oy
    Inventors: Ove S. Andell, Harri Hokkanen, Marja Mustonen
  • Patent number: 6143844
    Abstract: Provided are heterogeneous catalysts for homo- and copolymerization of olefins as well as a method for preparing these catalysts, which comprise at least one metallocene compound of a Group 4A, 5A or 6A (Hubbard) transition metal on a solid inorganic support. The method comprises the steps of vaporizing the metallocene compound, treating the support material with the vaporized metallocene compound at a temperature which is sufficiently high to keep the metallocene compound in the vaporous state, contacting the support material with an amount of the vaporized metallocene compound which is sufficient to allow for a reaction between the metallocene compound and at least a substantial part of the available surface sites capable of reacting therewith, removing the rest of the metallocene compound not bound to the support, and optionally treating the product thus obtained with an activating agent. The catalysts are active even if very low amounts of activator agents, such as alumoxane, are used.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: November 7, 2000
    Assignee: Borealis A/S
    Inventors: Harri Hokkanen, Hilkka Knuuttila, Eeva-Liisa Lakomaa, Pekka Sormunen
  • Patent number: 5986021
    Abstract: Process for manufacturing ethylene copolymers by polymerizing ethylene and a minor amount of C.sub.3 -C.sub.6 alphaolefins in particle form in slurry reactor in the presence of an ethylene polymerizing catalyst. According to the invention the polymerization is carried out in propane diluent by using a metallocene catalyst activated with an alumoxane compound.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: November 16, 1999
    Assignee: Borealis A/S
    Inventors: Harri Hokkanen, Hannu Salminen, Kalle Kallio, Hilkka Knuuttila, Ari Palmroos
  • Patent number: 5880055
    Abstract: The present invention concerns heterogeneous catalysts for polymerization of olefins. The catalysts include at least one Group IVa metal compound on a solid inorganic oxidic support. According to the invention the catalysts are prepared by vapourizing at least one solid Group IVa metal halide compound and routing the vapour of the metal halide compound into a reaction chamber, wherein the vapour is reacted with the support at a temperature of about 250.degree. to about 450.degree. C. in order to bind said metal halide compound to said support. Any metal compound not bound to said support as well as any volatile reaction products emanating from the reaction between said metal halide compound and said support are then removed from the reaction chamber in the vapour phase. Optionally, the product obtained is treated with an organic aluminum compound to increase the catalytic activity of said catalyst.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: March 9, 1999
    Assignee: Neste Oy
    Inventors: Hilkka Knuuttila, Pekka Sormunen, Eero Iiskola, Eeva-Liisa Lakomaa, Harri Hokkanen
  • Patent number: 5767032
    Abstract: Provided are heterogeneous catalysts for homo- and copolymerization of olefins as well as a method for preparing these catalysts, which comprise at least one metallocene compound of a Group 4A, 5A or 6A (Hubbard) transition metal on a solid inorganic support. The mtehod comprises the steps of vaporizing the metallocene compound, treating the support material with the vaporized metallocene compound at a temperature which is sufficiently high to keep the metallocene compound in the vaporous state, contacting the support material with an amount of the vaporized metallocene compound which is sufficient to allow for a reaction between the metallocene compound and at least a substantial part of the available surface sites capable of reacting therewith, removing the rest of the metallocene compound not bound to the support, and optionally treating the product thus obtained with an activating agent. The catalysts are active even if very low amounts of activator agents, such as alumoxane, are used.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: June 16, 1998
    Assignee: Borealis A/S
    Inventors: Harri Hokkanen, Hilkka Knuuttila, Eeva-Liisa Lakomaa, Pekka Sormunen