Multiphasic polymer as a thickening and suspending agent

Patent metadata

Field	Value
Publication number	US-10470994-B2
Application number	US-201515532299-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Dec 23, 2014
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

The invention relates to multiphasic polymers comprising from 45% to 95% by weight of a first polymer P1 and from 5% to 55% by weight of a second polymer P2, said polymers P1 and P2 being of distinct compositions,
said polymer P1 being obtained by polymerization from a mixture of monomers comprising at least one anionic monomer (a) having a polymerizable vinyl group, at least one nonionic hydrophobic monomer (b) having a polymerizable vinyl group, at least one cross-linking monomer (c) and at least one associative monomer (d) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain and said polymer P2 being obtained by polymerization from a mixture of monomers comprising at least one anionic monomer (a′) having a polymerizable vinyl group, at least one nonionic hydrophobic monomer (b′) having a polymerizable vinyl group and at least one cross-linking monomer (c′).

It also relates to a method for the preparation of these polymers, to aqueous compositions comprising them and to their use as thickening and suspending agents.

First claim

The invention claimed is:

1. A multiphasic polymer, comprising from 45% to 95% by weight of a first polymer P1 and from 5% to 55% by weight of a second polymer P2, said polymers P1 and P2 being of distinct compositions, wherein:
(1) the polymer P1 is obtained by polymerization from a mixture of monomers comprising:
at least one anionic monomer (a) having a polymerizable vinyl group,
at least one nonionic hydrophobic monomer (b) having a polymerizable vinyl group,
at least one cross-linking monomer (c),
at least one associative monomer (d) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain, and
optionally at least one additional nonionic monomer (e), distinct from the monomer (b); and

(2) the polymer P2 is obtained by polymerization from a mixture of monomers comprising:
at least one anionic monomer (a′) having a polymerizable vinyl group,
at least one nonionic hydrophobic monomer (b′) having a polymerizable vinyl group,
at least one cross-linking monomer (c′),
optionally at least one associative monomer (d′) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain, and
optionally at least one additional nonionic monomer (e′), distinct from the monomer (b′).

2. The polymer according to claim 1 , wherein a polymer P1/polymer P2 weight ratio is between 45/55 and 95/5.

3. The polymer according to claim 1 , wherein said anionic monomer(s) is(are) selected from the group consisting of a monomer of acrylic acid, a monomer of methacrylic acid, salts thereof and mixtures thereof.

4. The polymer according to claim 1 , wherein said anionic monomer(s) (a) represent(s) from 20% to 53% by weight, based on a total weight of monomers constituting the polymer P1.

5. The polymer according to claim 1 , wherein said anionic monomer(s) (a′) represent(s) from 10% to 53% by weight, based on a total weight of monomers constituting the polymer P2.

6. The polymer according to claim 1 , wherein said nonionic hydrophobic monomer(s) is(are) selected from the group consisting of a C 1 -C 8 alkyl acrylate, a C 1 -C 8 alkyl methacrylate, and mixtures thereof.

7. The polymer according to claim 1 , wherein said nonionic hydrophobic monomer(s) (b) represent(s) from 40% to 75% by weight, based on a total weight of monomers constituting the polymer P1.

8. The polymer according to claim 1 , wherein said nonionic hydrophobic monomer(s) (b′) represent(s) from 50% to 85% by weight, based on a total weight of monomers constituting the polymer P2.

9. The polymer according to claim 1 , wherein a nonionic hydrophobic monomers (b′)/anionic monomers (a′) weight ratio of the composition of the polymer P2 is between 60/40 and 85/15.

10. The polymer according to claim 1 , wherein said cross-linking monomer(s) is(are) a trifunctional cross-linking monomer.

11. The polymer according to claim 1 , wherein a content of cross-linking monomer(s) (c) in the composition of the polymer P1 is greater than or equal to 0.3% by weight, based on a total weight of the monomers constituting the polymer P1.

12. The polymer according to claim 1 , wherein a content of cross-linking monomer(s) (c′) in the composition of the polymer P2 is greater than or equal to 0.2% by weight, based on a total weight of the monomers constituting the polymer P2.

13. The polymer according to claim 1 , wherein said associative monomer(s) is(are) monomers of following formula (I):
T-[(EO) n (PO) n′ (BO) n″ ]—Z  (I)

in which:
T represents an end which makes possible the copolymerization of the associative monomer;
[(EO) n (PO) n′ (BO) n″ ] represents a polyalkoxylated chain consisting of alkoxylated units, distributed in blocks, alternating or random, selected from the group consisting of ethoxylated units EO, propoxylated units PO and butoxylated units BO;
n, n′ and n″ represent, independently of one another, 0 or an integer varying from 1 to 150; and
Z represents a linear or branched fatty chain of at least 12 carbon atoms and optionally comprising one or more 5- to 7-membered cyclic group(s) which are saturated, partially unsaturated or aromatic,
said groups may be optionally substituted.

14. The polymer according to claim 1 , wherein said associative monomer(s) is(are) present in a proportion of at least 0.5% by weight, based on a total weight of monomers constituting the polymer P1.

15. The polymer according to claim 1 , wherein the additional nonionic monomers (e) and (e′) are selected from the group consisting of:
2-acrylamido-2-methylpropanesulfonic acid (AMPS),
an unsaturated telomer of acrylic acid,
a monomer of formula (e1):

in which:
R a , R b and R c represent, independently of one another, H or CH 3 ,
n is an integer equal to 1 or 2, and

a monomer of formula (e2):

in which:
R a′ , R b′ , R c′ and R d′ represent, independently of one another, H or CH 3 ,
X represents (C═O) or (CH 2 ) r with r=0, 1 or 2,
(AO) represents a polyalkoxylated chain consisting of alkoxylated units, distributed in blocks, alternating or random, chosen from ethoxylated units EO, propoxylated units PO and butoxylated units BO, and
q represents 0 or an integer varying from 1 to 150.

16. The polymer according to claim 1 , comprising:
(1) a polymer P1 obtained by polymerization from a mixture of monomers comprising:
from 30% to 43% by weight of at least one anionic monomer (a) having a polymerizable vinyl group,
from 50% to 65% by weight of at least one nonionic hydrophobic monomer (b) having a polymerizable vinyl group,
from 0.4% to 5% by weight of at least one cross-linking monomer (c),
at least 0.5% by weight of at least one associative monomer (d) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain, and
optionally at least one additional nonionic monomer (e), distinct from the monomer (b); and

(2) a polymer P2 obtained by polymerization from a mixture of monomers comprising, indeed even being constituted of:
from 20% to 43% by weight of at least one anionic monomer (a′) having a polymerizable vinyl group,
from 60% to 75% by weight of at least one nonionic hydrophobic monomer (b′) having a polymerizable vinyl group,
from 0.3% to 5% by weight of at least one cross-linking monomer (c′),
optionally at least one associative monomer (d′) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain, and
optionally at least one additional nonionic monomer (e′), distinct from the monomer (b′).

17. A method for preparing the multiphasic polymer of claim 1 , the method comprising:
(i) polymerizing the polymer P1 from a first mixture of monomers comprising:
at least one anionic monomer (a) having a polymerizable vinyl group,
at least one nonionic hydrophobic monomer (b) having a polymerizable vinyl group,
at least one cross-linking monomer (c),
at least one associative monomer (d) having a polymerizable vinyl group and a hydrophobic hydrocarbon chain, and
optionally at least one additional nonionic monomer (e), distinct from the monomer (b); and

(ii) polymerizing, in the presence of the polymer P1 obtained above, a second mixture of monomers comprising:
at least one anionic monomer (a′) having a polymerizable vinyl group,
at least one nonionic hydrophobic monomer (b′) having a polymerizable vinyl group,
at least one cross-linking monomer (c′),
optionally an associat

Assignees

• Coatex Sas

Inventors

• Champagne Clementine
• Suau Jean-Marc
• Magny Benoit
• Bony Delphine
• Kensicher Yves

Classifications

• A61K8/91

  Graft copolymers (A61K8/89 takes precedence) · CPC title

• C08F265/06

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C11D3/3765

  in liquid compositions · CPC title

• A61K8/8152 Primary

  Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers · CPC title