US 12,421,330 B2
Polymer and its preparation method
Gatien Faucher, Andrezieux Boutheon (FR); Damien Fougerouse, Andrezieux Boutheon (FR); and Cyril Barriere, Andrezieux Boutheon (FR)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Appl. No. 18/873,218
Filed by SNF Group, Andrezieux Boutheon (FR)
PCT Filed Jun. 23, 2023, PCT No. PCT/EP2023/067191
§ 371(c)(1), (2) Date Dec. 9, 2024,
PCT Pub. No. WO2023/247783, PCT Pub. Date Dec. 28, 2023.
Claims priority of application No. 2206322 (FR), filed on Jun. 24, 2022.
Prior Publication US 2025/0171568 A1, May 29, 2025
Int. Cl. C08F 8/28 (2006.01); C08F 285/00 (2006.01); D21H 17/37 (2006.01); D21H 21/18 (2006.01); D21H 27/10 (2006.01)
CPC C08F 8/28 (2013.01) [C08F 285/00 (2013.01); D21H 17/37 (2013.01); D21H 21/18 (2013.01); D21H 27/10 (2013.01)] 20 Claims
 
1. A water-soluble dialdehyde-functionalized polymer comprising
at least one monomer A: cationic or anionic;
at least one monomer B: non-ionic;
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), different from the at least one monomer B:

OG Complex Work Unit Chemistry
R1 and R2 being, independently of one another, a hydrogen atom or 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 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 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 the fraction F3 on PG2, in order to form a solution comprising a base polymer;
g) dilution of the solution comprising the base polymer and reaction between at least one dialdehyde and the base polymer in order to obtain a water-soluble dialdehyde-functionalized polymer;
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;
with monomer A being distinct from a mixture of cationic monomer and anionic monomer,
when monomer A is anionic, the water-soluble dialdehyde-functionalized polymer does not comprise any cationic monomer,
when monomer A is cationic, the water-soluble dialdehyde-functionalized polymer does not comprise any anionic monomer, with the exception of compound I.