Patents by Inventor Jussi Nikkarinen

Jussi Nikkarinen 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).

  • Bleaching of cellulosic fibre material with peroxide using polymers as a stabiliser
    Patent number: 7754048
    Abstract: The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: July 13, 2010
    Assignee: Kemira Oyj
    Inventors: Aarto Paren, Jukka Jäkärä, Ilkka Renvall, Jonni Ahlgren, Riitta Laitinen, Jussi Nikkarinen, Tapio Viitanen
  • Bleaching of cellulosic fibre material with peroxide using polymers as a stabiliser
    Publication number: 20060144534
    Abstract: The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.
    Type: Application
    Filed: January 9, 2004
    Publication date: July 6, 2006
    Inventors: Aarto Paren, Jukka Jakara, Ilkka Renvall, Jonni Ahlgren, Riitta Laitinen, Jussi Nikkarinen, Tapio Viitanen
  • Process for preparing a cationically modified (meth)acrylamide polymer and use of the polymer
    Patent number: 6387998
    Abstract: The invention relates to a process for preparing a cationically modified (meth)acrylamide polymer by the Mannich reaction. There is prepared in advance a stable aldehyde-secondary amine adduct, which is obtained as a reaction product of an aqueous solution of the secondary amine and an aqueous solution of the aldehyde, and which, after the formation of the adduct, is stabilized to endure storage, by lowering the pH of the mixture of 7 or below and/or by adding methanol, and the adduct thus prepared is added to an aqueous solution of the (meth)acrylamide polymer and the pH is adjusted to an alkaline level, whereupon modification occurs. The invention also relates to the use of the modified (meth)acrylamide polymer as a flocculation, retention or dewatering agent.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: May 14, 2002
    Assignee: Kemira Chemicals Oy
    Inventors: Jonni Ahlgren, Lars Petander, Jussi Nikkarinen