US 12,331,147 B2
Polymer and its preparation method
Gatien Faucher, Andrezieux Boutheon (FR); Damien Fougerouse, Andrezieux Boutheon (FR); Bastien Martel, Andrezieux Boutheon (FR); and Cyril Barriere, Andrezieux Boutheon (FR)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Appl. No. 18/873,206
Filed by SNF Group, Andrezieux Boutheon (FR)
PCT Filed Jun. 23, 2023, PCT No. PCT/EP2023/067192
§ 371(c)(1), (2) Date Dec. 9, 2024,
PCT Pub. No. WO2023/247784, PCT Pub. Date Dec. 28, 2023.
Claims priority of application No. 2206325 (FR), filed on Jun. 24, 2022.
Prior Publication US 2025/0171576 A1, May 29, 2025
Int. Cl. C08F 285/00 (2006.01); D21H 17/45 (2006.01)
CPC C08F 285/00 (2013.01) [D21H 17/45 (2013.01)] 20 Claims
 
1. A polyvinylamine polymer resulting from the Hofmann Degradation reaction of a base polymer comprising:
at least one cationic monomer A;
at least one non-ionic monomer B selected from acrylamide, acrylonitrile, methacrylamide and mixtures thereof;
at least one structuring system comprising:
(i) at least one compound I, selected from: allylsulfonic acid, methallylsulfonic acid, allyldisulfonic acid, methallyldisulfonic acid, salts and mixtures thereof;
(ii) at least one compound II of formula (1):

OG Complex Work Unit Chemistry
R1 and R2 being, independently of each other, a hydrogen atom, a methyl group, an ethyl group, an isopropyl group or a CH2—OH group;
R1 and R2 not both being a hydrogen atom;
said polymer lacking an anionic monomer other than compound I;
said polyvinylamine polymer being obtained according to the following steps:
a) formation of a solution (S1) comprising at least a first fraction (F1) containing (1) at least one monomer selected from monomers A and B and (2) at least one compound selected from compounds I and II;
b) polymerization 1 (PO1) of the fraction F1 to form a solution of a solution of a first gradient polymer (PG1);
c) addition, to the solution comprising PG1, of a second fraction (F2) containing (1) at least one monomer selected from monomers A and B and (2) at least one compound selected from compounds I and II;
d) polymerization 2 (PO2) of the fraction F2 on PG1 in order to form a solution of a second gradient polymer (PG2);
e) addition, to the solution comprising PG2 of a third fraction (F3) containing (1) at least one monomer selected from monomers A and B and (2) at least one compound selected from compounds I and II;
f) polymerization 3 (PO3) of fraction F3 on PG2 in order to form a solution comprising a base polymer;
g) dilution of the solution comprising this base polymer and Hofmann degradation reaction on the base polymer in order to obtain a polyvinylamine polymer and
at least one of the fractions F1, F2 or F3 contains at least one monomer A,
at least one of the fractions F1, F2 or F3 contains at least one monomer B,
at least one of the fractions F1, F2 or F3 contains at least one compound I and
at least one of the fractions F1, F2 or F3 contains at least one compound II.