Water-based adhesive fixing composition having improved creep properties

1. An adhesive composition comprising:

a) from 50 to 75 wt %, relative to the weight of the adhesive composition, of an aqueous dispersion in water of at least one polymer obtained from:

(a1) a styrene monomer, and

(a2) at least one comonomer that is a (meth)acrylic acid, a basic salt of said acid, an alkyl (meth)acrylate whose alkyl moiety, saturated or unsaturated, linear or branched, cyclic or acyclic, has 1 to 30 carbon atoms, said alkyl moiety optionally being interrupted by one or more oxygen atoms, optionally epoxidized and/or optionally terminated with a hydroxyl function, and optionally

(a3) a silanized comonomer that is a vinyl silane or a silanized (meth)acrylic acid ester,

the aqueous dispersion a) having a content of dry matter of 30 to 80 wt % relative to the weight of said dispersion a),

b) from 2.5 to 6 wt %, relative to the weight of the adhesive composition, of at least one sepiolite,

c) from 0.5 to 3 wt %, relative to the weight of the adhesive composition, of a composition comprising:

c1) a water-based composition comprising at least one polymer obtained from:

(c1.1) at least one monomer that is a (meth)acrylic acid, 2-acrylamido-2-methyl propane sulphonic acid, 2-sulphoethyl methacrylate, styrene phosphonic acid, or a basic salt of these acids, and

(c1.2) at least one comonomer that is a (meth)acrylamide or vinyl pyrrolidone,

the content of dry matter in the water-based composition c1) being 10 to 40 wt % relative to the weight of said water-based composition c1), and/or

c2) a water-based composition comprising:

(c2.1) at least one polymer obtained from:

(c2.1.1) at least one monomer that is a (meth)acrylic acid ester or maleic acid ester, said ester comprising at least one hydrocarbon group, saturated or unsaturated, linear or branched, cyclic or acyclic, having from 8 to 30 carbon atoms, and which moreover may or may not be alkoxylated by one or more C 1 -C 4 oxyalkylene groups, and

(c2.1.2) at least one comonomer that is a (meth)acrylic acid or a (meth)acrylic acid ester not having a hydrocarbon group, saturated or unsaturated, linear or branched, cyclic or acyclic, having from 8 to 30 carbon atoms, or

(c2.2) at least one polyurethane comprising at least one hydrocarbon group, saturated or unsaturated, linear or branched, cyclic or acyclic, having from 8 to 30 carbon atoms, and which moreover may or may not be alkoxylated by one or more C 1 -C 4 oxyalkylene groups,

the water-based composition c2) having content of dry matter 20 to 40 wt % relative to the weight of said water-based composition c2), and

d) from 20 to 40 wt % of at least one filler.

2. The composition according to claim 1 , wherein the polymer in the aqueous dispersion a) has a glass transition temperature (Tg) less than or equal to 65° C.

3. The composition according to claim 1 , wherein the polymer in the water-based composition c1) is obtained from:

(c1.1) at least one monomer that is a (meth)acrylic acid or basic salt thereof, and

(c1.2) at least one comonomer that is a (meth)acrylamide.

4. The composition according to claim 1 , wherein the water-based composition c1) is an inverted emulsion.

5. The composition according to claim 1 , wherein the polymer (c2.1) comprised in the water-based composition c2) is obtained from:

(c2.1.1) at least one monomer that is an alkyl (meth)acrylate or alkyl mono- or dimaleate, the alkyl moiety, linear or branched, cyclic or acyclic of each of these monomers having from 8 to 30 carbon atoms, and which moreover may or may not be alkoxylated by one or more C 1 -C 4 oxyalkylene groups, and

(c2.1.2) at least one comonomer from that is a (meth)acrylic acid or alkyl (meth)acrylate whose linear or branched, cyclic or acyclic alkyl moiety has 1 to 4 carbon atoms.

6. The composition according to claim 1 , wherein the polymers (c2.1) and (c2.2) are associative polymers.

7. The composition according to claim 1 , having a pH greater than or equal to 7.

8. The composition according to claim 1 , wherein the filler is calcium carbonate, and said filler may be hydrophilic or hydrophobic, precipitated or micronized.

9. The composition according to claim 1 , comprising at least one plasticizer that is a hydroxylated compound that is liquid at a temperature of 15 to 25° C., and possess from 4.0 to 5.0 milliequivalents of OH function per gram of plasticizer.

10. In a fixing glue, capable of fixing an element on a ceiling, a floor or an approximately vertical substrate, said fixing glue comprising an adhesive, wherein the improvement comprising using the adhesive of claim 1 .