公开(公告)号：US11535985B2

公开(公告)日：2022-12-27

申请号：US16916173

申请日：2020-06-30

Applicant: Kemira Oyj

Inventor： Yuping Luo ,  Jennifer Riser ,  Zheng Dang ,  Junhua Chen ,  Ronald Robinson ,  Andrew Pencek ,  Barbara Lukasik

IPC: D21H11/16 ,  D21H17/37 ,  D21H17/56 ,  D21H21/10 ,  D21H23/16 ,  D21H23/76

Abstract: A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.

公开(公告)号：US20210002827A1

公开(公告)日：2021-01-07

申请号：US16916173

申请日：2020-06-30

Applicant: Kemira Oyj

Inventor： Yuping Luo ,  Jennifer Riser ,  Zheng Dang ,  Junhua Chen ,  Ronald Robinson ,  Andrew Pencek ,  Barbara Lukasik

IPC: D21H17/37 ,  D21H21/10 ,  D21H23/16 ,  D21H23/76 ,  D21H11/16 ,  D21H17/56

Abstract: A method for manufacture of paper or board, in which method an inverted solution of cationic polymer is added to the fiber suspension for providing retention enhancement without over-flocculating fiber stock and destruction sheet formation and/or improving drainage and enhancing or at least maintaining strength of paper or board, An inverted solution has a bulk viscosity of 50-150 mPas at 0.2 weight-% cationic polymer concentration and inverted solution comprises cationic polymer obtained by reverse phase emulsion polymerization of a monomer blend comprising non-ionic monomers, 15-50 mol-% cationic monomers, an optionally at most 50 ppm of a crosslinking agent, and a chain transfer agent, and the obtained reverse phase emulsion of cationic polymer is inverted into an aqueous solution.