公开(公告)号：US20210301473A1

公开(公告)日：2021-09-30

申请号：US16341464

申请日：2017-11-22

Applicant: KEMIRA OYJ

Inventor： Matti Hietaniemi ,  Asko Karppi ,  Maarit Latvanen ,  Elsa Olmos

IPC: D21H21/02 ,  C08F220/56 ,  D21H17/45 ,  D21H17/68 ,  D21H17/00 ,  D21H23/04 ,  D21H11/14 ,  D21F1/02 ,  D21F1/10

Abstract: The invention relates to a use of a water-soluble polymer product comprising amphoteric polyacrylamide, which has neutral or cationic net charge at pH 7, a weight-average molecular weight of 2 500 000-18 000 000 g/mol and a total ionicity of 4-28 mol-%. The polymer product is used for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres. The invention relates also to a method for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres, as well as to produced paper or board.

公开(公告)号：US11441273B2

公开(公告)日：2022-09-13

申请号：US16341464

申请日：2017-11-22

Applicant: KEMIRA OYJ

Inventor： Matti Hietaniemi ,  Asko Karppi ,  Maarit Latvanen ,  Elsa Olmos

IPC: D21H11/14 ,  D21H21/02 ,  C08F220/56 ,  D21F1/02 ,  D21F1/10 ,  D21H17/45 ,  D21H17/68 ,  D21H17/00 ,  D21H23/04

Abstract: The invention relates to a use of a water-soluble polymer product comprising amphoteric polyacrylamide, which has neutral or cationic net charge at pH 7, a weight-average molecular weight of 2,500,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%. The polymer product is used for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres. The invention relates also to a method for controlling deposit formation caused by hydrophobic substances in manufacture of paper or board, where a fibre web is formed from an aqueous suspension of fibres, as well as to produced paper or board.