METHOD OF PRODUCING A CATIONIC POLYMER WITH AT LEAST BIMODAL MOLECULAR WEIGHT DISTRIBUTION Russian patent published in 2020 - IPC C08F2/22 C08F220/34 C08F226/00 C08L39/04 C08L39/06 

FIELD: chemical or physical processes.

SUBSTANCE: present invention relates to a method of producing a cationic polymer. Method is realized by polymerisation of at least one cationic monomer and at least one non-ionic monomer (monomer component a), at least one cross-linking agent (monomer component b) and optionally a chain transfer agent (monomer component c). Cationic polymer has at least bimodal molecular weight distribution with at least one first peak (P1) and at least one second peak (P2), where first peak has lower average sedimentation coefficient ≤100 Svedberg units and the second peak have a higher average sedimentation coefficient ≥1000 units of Svedberg. Polymerisation is carried out in the form of two consecutive stages I) and II). Step I) involves polymerisation of monomer component a) and monomer component b). Step II) comprises polymerising monomer component a), optionally monomer component c) in complete absence or presence of less than 10 parts per million (relative to total amount of polymer) of monomer component b). Stage II) is carried out after polymerisation at stage I) is completed.

EFFECT: present method enables to obtain cationic polymers which differ in molecular weight and have at least bimodal distribution of molecular weight in a single method.

18 cl, 2 tbl, 19 ex