公开(公告)号：US20240141075A1

公开(公告)日：2024-05-02

申请号：US18281067

申请日：2022-03-18

Applicant: KEMIRA OYJ

Inventor： Jaakko HILTUNEN ,  Jonni AHLGREN ,  Sanna LEHTO ,  Eija AHONEN

IPC: C08B15/06

CPC classification number: C08B15/06

Abstract: The invention relates to a method for producing a modified cationized polysaccharide. The method comprises preparing a reaction slurry by mixing of a starting material comprising a polysaccharide, preferably cellulose, and an alkaline liquid medium comprising an organic liquid, allowing the polysaccharide to interact with the alkaline liquid medium in the reaction slurry at a pre-treatment temperature under a pre-determined reaction time, and adjusting the temperature of the reaction slurry to modification temperature, which is less than the boiling point of the alkaline liquid medium. A cationizing agent and an alkylation agent, which comprises an epoxy group, are added to the reaction slurry at the modification temperature, and the polysaccharide is allowed to react with the alkylation agent and the cationizing agent, preferably under inert atmosphere, and obtaining a modified cationized polysaccharide product in solution form. The invention relates also to the modified cationized polysaccharide and its use as flocculation agent.

公开(公告)号：US20230053998A1

公开(公告)日：2023-02-23

申请号：US17794618

申请日：2021-01-22

Applicant: KEMIRA OYJ

Inventor： Mikko VIRTANEN ,  Kaisa KARISALMI ,  Sanna LEHTO ,  Jan-Luiken HEMMES

IPC: D21H11/18 ,  D21H17/29 ,  D21H17/25 ,  D21H17/45 ,  D21H21/20 ,  D21H21/10 ,  D21H23/04

Abstract: A product includes a microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative, as a combined preparation for simultaneous or separate use. The anionic cellulose derivative has a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65. Additionally, a paper sheet includes the product as an additive to increase the initial wet web strength and/or dry tensile strength of the paper sheet.

公开(公告)号：US20230014619A1

公开(公告)日：2023-01-19

申请号：US17781963

申请日：2020-12-04

Applicant: Kemira Oyj

Inventor： Veli-Matti VUORENPALO ,  Jonni AHLGREN ,  Jaakko HILTUNEN ,  Anna-Maija PERANDER ,  Chunlin XU ,  Sanna LEHTO ,  Eija AHONEN ,  Tarja IKÄVALKO

IPC: C08B11/14 ,  C08B1/08

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.