Self-adhesive article with foam support

1. A self-adhesive article comprising a support layer coated with an adhesive layer, said support layer having an elongation at break ranging from 50 to 1200% and a bulk density ranging from 25 to 1200 kg/m 3 , said adhesive layer is obtained by cross-linking an adhesive composition comprising:

a) at least one polymer of formula (Ia) or at least one polymer of formula (IIa)

b) at least one tackifier resin, and

c) at least one cross-linking catalyst;

wherein:

the polymer of formula (Ia) is a polyurethane or a polyether comprising two or three hydrolysable terminal groups of trialkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

the polymer of formula (IIa) is a polyurethane or a polyether comprising two or three hydrolysable terminal groups of dialkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

in formulae (Ia), (IIa) above,

B represents one of the two formulae below:

where D and T represent a hydrocarbon radical comprising 2 to 66 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,

R 1 represents a divalent hydrocarbon radical comprising 5 to 15 carbon atoms which is aromatic or aliphatic, linear, branched or cyclic,

R 3 represents a linear or branched divalent alkylene radical comprising 1 to 6 carbon atoms,

R 2 represents a linear or branched divalent alkylene radical comprising 2 to 4 carbon atoms,

R 4 and R 5 , identical or different, each represent a linear or branched alkyl radical comprising 1 to 4 carbon atoms, R 4 optionally being able to be part of a ring,

R 6 represents a hydrocarbon radical comprising 1 to 22 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,

R 7 represents a hydrogen atom, a phenyl radical or a linear, branched or cyclic alkyl radical comprising 1 to 10 carbon atoms,

n is an integer such that the average molar mass of the polyether block of formula —[OR 2 ] n — ranges from 300 g/mol to 40000 g/mol,

m is an integer such that the average molar mass of the polymer ranges from 600 g/mole to 100000 g/mole,

p is an integer equal to 0, 1 or 2

f is an integer equal to 2 or 3.

2. The self-adhesive article according to claim 1 , wherein the support layer has a Young's modulus less than or equal to 300 MPa.

3. The self-adhesive article according to claim 1 , wherein the support layer is in the form of a foam.

4. The self-adhesive article according to claim 1 , wherein the support layer is presented in the form of one or more polymeric layers.

5. The self-adhesive article according to claim 1 , wherein the adhesive composition comprises:

from 20 to 85% by weight, with respect to the total weight of the adhesive composition, of at least one polymer or a mixture of polymers,

from 15 to 80% by weight, with respect to the total weight of the adhesive composition, of at least one tackifier resin,

from 0.01 to 3% by weight, with respect to the total weight of the adhesive composition, of at least one cross-linking catalyst.

6. The self-adhesive article according to claim 1 , wherein the tackifier resin has a number-average molar mass ranging from 100 Da to 5 kDa and is:

(i) resins able to be obtained by polymerization of terpene hydrocarbons and phenols, in the presence of Friedel-Crafts catalysts,

(ii) resins able to be obtained by polymerization of alpha-methyl styrene,

(i) rosins of natural or modified origin;

(iv) resins obtained by hydrogenation, polymerization or copolymerization of mixtures of unsaturated aliphatic hydrocarbons having approximately 5, 9 or 10 carbon atoms, originating from petroleum cuts,

(v) terpene resins generally resulting from the polymerisation of terpene hydrocarbons in the presence of Friedel-Crafts catalysts,

(vi) copolymers based on natural terpenes, or

(vii) acrylic resins.