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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/m3, said adhesive layer is obtained by cross-linking an adhesive composition comprising:
a) a mixture of at least two polymers that are polyurethanes or polyethers with one, two or three mono-, di- or tri-alkoxysilane terminal groups, said mixture comprising at least one polymer corresponding to one of formulae (Ia), (IIa), (IIIa) or (IVa), and at least one polymer corresponding to one of formulae (I), (II), (III) or (IV),it being understood that
when a polymer with two or three monoalkoxysilane terminal groups is present, said mixture comprises up to 15% by weight, with respect to the total weight of the mixture, of said polymer,when a polymer with one mono-, di- or tri-alkoxysilane terminal group is present, said mixture comprises up to 15% by weight, with respect to the total weight of the mixture, of said polymer, 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 trialkoxysilane terminal groups, 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 dialkoxysilane terminal groups, 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 (IIIa) is a polyurethane or a polyether comprising two or three hydrolyzable monoalkoxysilane terminal groups, 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 (IVa) is a polyurethane or a polyether comprising one hydrolysable mono-, di- and/or trialkoxysilane terminal group, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula: and wherein Formulae (I)-(IV) arewherein in formulae (Ia), (IIa), (IIIa) and (IVa) and in formulae (I), (II), (III) and (IV) 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, R1 represents a divalent hydrocarbon radical comprising 5 to 15 carbon atoms which can be aromatic or aliphatic, linear, branched or cyclic, R3 represents a linear or branched divalent alkylene radical comprising 1 to 6 carbon atoms, R2 represents a linear or branched divalent alkylene radical comprising 2 to 4 carbon atoms, R4 and R5, identical or different, each represent a linear or branched alkyl radical comprising 1 to 4 carbon atoms, R4 optionally being part of a ring, R6 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, R7 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 —[OR2]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. |
