Patents by Inventor Anna-Maija PERANDER

Anna-Maija PERANDER 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 FOR PRODUCING CATIONIZED CELLULOSE AND CATIONIZED CELLULOSE
    Publication number: 20230014619
    Abstract: The invention relates to a method for producing cationized cellulose. The method comprises at least preparing a slurry of a cellulosic starting material in an alkaline liquid medium which comprises an organic liquid and performing mercerization of the slurry. The concentration of the cellulosic starting material in the slurry is at least 20 weight-%, calculated as dry from total weight of the liquid medium and the cellulosic starting material. A cationizing agent is added to the slurry after the mercerization step at a cationization temperature, which is less than the boiling point of the alkaline liquid medium, and the cellulose in the slurry is allowed to react with the cationizing agent, preferably under inert atmosphere and a cationized cellulose product is obtained.
    Type: Application
    Filed: December 4, 2020
    Publication date: January 19, 2023
    Inventors: Veli-Matti VUORENPALO, Jonni AHLGREN, Jaakko HILTUNEN, Anna-Maija PERANDER, Chunlin XU, Sanna LEHTO, Eija AHONEN, Tarja IKÄVALKO
  • Process for the preparation of a mixture of chelating agents, mixture of chelating agents and methods of using them
    Patent number: 11225456
    Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: January 18, 2022
    Assignee: Kemira Oyj
    Inventors: Reijo Aksela, Jonas Konn, Anna-Maija Perander, Anna Haarala, Riitta Ilmoniemi, Hanna Hoffren
  • Process for treating pulp
    Patent number: 11072886
    Abstract: The present invention relates to a process for treating pulp comprising a step, wherein the pulp is treated with distilled percarboxylic acid, such as distilled per-carboxylic acid (dPAA), and peroxide, such as hydrogen peroxide.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: July 27, 2021
    Assignee: KEMIRA OYJ
    Inventors: Leif Robertsén, Veli-Matti Vuorenpalo, Anna-Maija Perander, Pentti Pekonen, Jonas Konn
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200223786
    Abstract: The present invention relates to a process for the in situ preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine with maleic acid and then with 2-halocarboxylic acid, mixtures obtainable using said process and mixtures of chelating agents. In addition, the invention relates to methods where such mixtures are used.
    Type: Application
    Filed: June 27, 2018
    Publication date: July 16, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • Process for the Preparation of a Mixture of Chelating Agents, Mixture of Chelating Agents and Methods of Using Them
    Publication number: 20200181063
    Abstract: The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents.
    Type: Application
    Filed: June 27, 2018
    Publication date: June 11, 2020
    Applicant: Kemira Oyj
    Inventors: Reijo AKSELA, Jonas KONN, Anna-Maija PERANDER, Anna HAARALA, Riitta ILMONIEMI, Hanna HOFFREN
  • A process for treating pulp
    Publication number: 20190186075
    Abstract: The present invention relates to a process for treating pulp comprising a step, wherein the pulp is treated with distilled percarboxylic acid, such as distilled per-carboxylic acid (dPAA), and peroxide, such as hydrogen peroxide.
    Type: Application
    Filed: June 27, 2017
    Publication date: June 20, 2019
    Applicant: KEMIRA OYJ
    Inventors: Leif ROBERTSÉN, Veli-Matti VUORENPALO, Anna-Maija PERANDER, Pentti PEKONEN, Jonas KONN