| 主权项 |
1. Adhesive composition comprising:
a) from 50 to 75 wt %, relative to the weight of the adhesive composition, of a dispersion in water of at least one polymer obtained from:
(a1) a styrene monomer, and(a2) at least one comonomer selected from (meth)acrylic acids, the basic salts of these acids, the alkyl (meth)acrylates whose alkyl moiety, saturated or unsaturated, linear or branched, cyclic or acyclic, comprises from 1 to 30 carbon atoms, and said alkyl moiety may be interrupted by one or more oxygen atoms, may be epoxidized and/or may be terminated with a hydroxyl function, and optionally(a3) a silanized comonomer selected from vinyl silanes and silanized (meth)acrylic acid esters,the content of dry matter in the aqueous dispersion a) being in the range from 30 to 80 wt % relative to the weight of said aqueous 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 selected from:
c1) a water-based composition comprising at least one polymer obtained from:(c1.1) at least one monomer selected from (meth)acrylic acids, 2-acrylamido-2-methyl propane sulphonic acid, 2-sulphoethyl methacrylate, styrene phosphonic acid, and the basic salts of these acids, and(c1.2) at least one comonomer selected from (meth)acrylamides and vinyl pyrrolidone,the content of dry matter in the water-based composition c1) being in the range from 10 to 40 wt % relative to the weight of said water-based composition c1), andc2) a water-based composition comprising:(c2.1) at least one polymer obtained from:(c2.1.1) at least one monomer selected from (meth)acrylic acid esters and maleic acid esters, said esters comprising at least one hydrocarbon group, saturated or unsaturated, linear or branched, cyclic or acyclic, comprising from 8 to 30 carbon atoms, and which moreover may or may not be alkoxylated by one or more C1-C4 oxyalkylene groups, and(c2.1.2) at least one comonomer selected from (meth)acrylic acids, and the (meth)acrylic acid esters not comprising a hydrocarbon group, saturated or unsaturated, linear or branched, cyclic or acyclic, comprising 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, comprising from 8 to 30 carbon atoms, and which moreover may or may not be alkoxylated by one or more C1-C4 oxyalkylene groups,the content of dry matter in the water-based composition c2) being in the range from 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. |
