Patents by Inventor Birgitta LINDBERG

Birgitta LINDBERG 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).

  • Method of producing hydrophobic paper
    Patent number: 11591753
    Abstract: The present disclosure relates to a method of producing hydrophobic paper, using a sizing additive based on depolymerized lignin and a hydrophobic paper obtainable by such method.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: February 28, 2023
    Assignee: SCA FOREST PRODUCTS AB
    Inventors: Raquel Bohn Stoltz, Birgitta Lindberg
  • Method of preparing a sizing boost additive
    Patent number: 11041273
    Abstract: A method of preparing a sizing boost additive, includes: I) combining a lignin oil and an aqueous solution of gelatinized cationic polysaccharide to obtain a lignin/polysaccharide blend, wherein the lignin oil is obtained by base catalyzed depolymerization of lignin; and the gelatinized cationic polysaccharide is prepared by cooking dry cationic polysaccharide in water until completely gelatinized; and wherein a weight ratio of lignin oil:polysaccharide in the blend is 1:0.5-2, where the weight of the polysaccharide is the weight of dry polysaccharide added in preparation of the aqueous solution of gelatinized cationic polysaccharide; and the combined weight of lignin and polysaccharide is 1-10 wt-% based on the total weight of the resulting blend; followed by II) mixing the lignin/polysaccharide blend at a temperature of 40-100° C., until the blend has changed color from grey-white to brown.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: June 22, 2021
    Assignee: SCA FOREST PRODUCTS AB
    Inventors: Anette Bergmark, Birgitta Lindberg
  • METHOD OF PRODUCING HYDROPHOBIC PAPER
    Publication number: 20210148052
    Abstract: The present disclosure relates to a method of producing hydrophobic paper, using a sizing additive based on depolymerized lignin and a hydrophobic paper obtainable by such method.
    Type: Application
    Filed: April 25, 2019
    Publication date: May 20, 2021
    Applicant: SCA Forest Products AB
    Inventors: Raquel BOHN-STOLTZ, Birgitta LINDBERG
  • METHOD OF PREPARING A SIZING BOOST ADDITIVE
    Publication number: 20190382959
    Abstract: A method of preparing a sizing boost additive, includes: I) combining a lignin oil and an aqueous solution of gelatinized cationic polysaccharide to obtain a lignin/polysaccharide blend, wherein the lignin oil is obtained by base catalyzed depolymerization of lignin; and the gelatinized cationic polysaccharide is prepared by cooking dry cationic polysaccharide in water until completely gelatinized; and wherein a weight ratio of lignin oil:polysaccharide in the blend is 1:0.5-2, where the weight of the polysaccharide is the weight of dry polysaccharide added in preparation of the aqueous solution of gelatinized cationic polysaccharide; and the combined weight of lignin and polysaccharide is 1-10 wt-% based on the total weight of the resulting blend; followed by II) mixing the lignin/polysaccharide blend at a temperature of 40-100° C., until the blend has changed color from grey-white to brown.
    Type: Application
    Filed: March 15, 2017
    Publication date: December 19, 2019
    Applicant: SCA Forest Products AB
    Inventors: Anette BERGMARK, Birgitta LINDBERG