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US 12,365,754 B2Granted
Polymer and method for the preparation thereof
AssigneeSnf Group
InventorsGatien Faucher, Damien Fougerouse
Life of this patent
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Abstract
The present invention relates to a novel anionic water-soluble polymer, to the method for the preparation thereof and to the use thereof, notably in the paper field.
Claims20
An anionic water-soluble polymer comprising:
- at least one anionic monomer A;
- at least one nonionic monomer B;
- at least one structuring system comprising:
- (i) at least one compound I, different from the at least one monomer A and selected from:
- allylsulfonic acid, methallylsulfonic acid, allyldisulfonic acid, methallyldisulfonic acid, salts thereof and mixtures thereof;
- and
- (ii) at least one compound II of formula II, different from the at least one monomer B:
- R1 and R2 being, independently of one another, 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 containing no cationic monomer and zwitterionic monomer;
- said anionic water-soluble polymer being obtained according to the following steps:
- a) formation of a solution (S1) comprising a first fraction (F1) containing (1) at least one monomer selected from the monomers A and B and (2) at least one compound selected from the compounds I and II;
- b) polymerization 1 (PO1) of the fraction F1 in order 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 the monomers A and B and (2) at least one compound selected from the 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 the monomers A and B and (2) at least one compound selected from the compounds I and II;
- f) polymerization 3 (PO3) of the fraction F3 on PG2 in order to form a solution comprising an anionic water-soluble 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 and
- the anionic water-soluble polymer does not comprise a crosslinking agent.
15 more elements
A method for making an anionic water-soluble polymer comprising:
- at least one anionic monomer A;
- at least one nonionic monomer B;
- at least one structuring system comprising:
- (i) at least one compound I, different from the at least one monomer A and selected from:
- allylsulfonic acid, methallylsulfonic acid, allyldisulfonic acid, methallyldisulfonic acid, salts thereof and mixtures thereof;
- and
- (ii) at least one compound II of formula II, different from the at least one monomer B:
- R1 and R2 being, independently of one another, 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 (R1≠H when R2=H;
- R2≠H when R1=H);
- said polymer containing no cationic monomer and zwitterionic monomer;
- the method comprising the following steps:
- a) formation of a solution (S1) comprising at least a first fraction (F1) containing (1) at least one monomer selected from the monomers A and B and (2) at least one compound selected from the compounds I and II;
- b) polymerization 1 (PO1) of the fraction F1 in order 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 the monomers A and B and (2) at least one compound selected from the compounds I and II;
- d) polymerization (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 the monomers A and B and (2) at least one compound selected from the compounds I and II;
- f) polymerization (PO3) of the fraction F3 on PG2 in order to form a solution comprising an anionic water-soluble 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, and
- the anionic water-soluble polymer does not comprise a crosslinking agent.
16 more elements
Dependencies are inferred from the claim text.