Patents Assigned to Holmen AB
  • Method for stabilizing the whiteness of fluorescent whitening agent(s)(FWA) included in surface-treatment size/coating slip for paper and of surface-treatment layers formed thereof
    Patent number: 9493913
    Abstract: The present invention relates to a method for increasing the whiteness stability of fluorescent whitening agent(s) (FWA) included in surface-treatment size/coating slip for paper and of the surface-treatment layers formed thereof. The method is characterized in that sorbitol is charged to the size/coating slip as a carrier.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: November 15, 2016
    Assignee: HOLMEN AB
    Inventors: Philippe Letzelter, Johan Lindgren
  • METHOD FOR PRODUCTION OF P-CYMENE
    Publication number: 20160194260
    Abstract: The present invention relates to a method for production of p-cymene from cyclic monoterpenes in the presence of an Fe(III)-salt as a catalyst. In particular it relates to a method for production of p-cymene from cyclic monoterpenes containing high levels of sulphur, such as crude sulphate turpentine. The method can be performed as two different, subsequent processes for the isomerization and oxidation reactions, or in a single process wherein these reactions take place at the same time.
    Type: Application
    Filed: August 12, 2014
    Publication date: July 7, 2016
    Applicant: Holmen AB
    Inventors: Jörg Brucher, David Blomberg Saitton
  • METHOD FOR STABILIZING THE WHITENESS OF FLUORESCENT WHITENING AGENT(S)(FWA) INCLUDED IN SURFACE-TREATMENT SIZE/COATING SLIP FOR PAPER AND OF SURFACE-TREATMENT LAYERS FORMED THEREOF
    Publication number: 20090281221
    Abstract: The present invention relates to a method for increasing the whiteness stability of fluorescent whitening agent(s) (FWA) included in surface-treatment size/coating slip for paper and of the surface-treatment layers formed thereof. The method is characterized in that sorbitol is charged to the size/coating slip as a carrier.
    Type: Application
    Filed: June 14, 2007
    Publication date: November 12, 2009
    Applicant: HOLMEN AB
    Inventors: Philippe Letzelter, Johan Lindgren
  • Surface treated security paper and method and device for producing surface treated security paper
    Patent number: 6174586
    Abstract: The present invention relates to security paper (1) formed from base paper provided with a surface treatment layer on at least one side of the paper, characterized in that the layer thickness locally deviates markedly from the layer (10) thickness of the remaining dominant paper surface, and in that the local deviation forms distinctive mark (2) in the paper. The present invention also relates to a method and to a device for producing surface treated security paper.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: January 16, 2001
    Assignee: Holmen AB
    Inventor: Lars-Åke Peterson
  • Method relating to after-treatment of packaging material
    Patent number: 6165548
    Abstract: The present invention provides a cost-effective manner of adding hydrophobic zeolite to packaging material for preventing or reducing the transmission of order-influencing and taste-influencing substances to the package contents, wherein a hydrophobic zeolite in powder form is added to the packaging material in conjunction with or immediately after applying printing ink and/or varnish to the packaging material.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: December 26, 2000
    Assignee: Holmen AB
    Inventor: Torgny Ljungberg