TWO-PART CURABLE COMPOSITION

1 - 20 . (canceled)

21 . Two-part curable composition comprising:

a first part (component A) comprising:

at least 50% by weight, based on the total weight of the first part, of one or more alkyl cyanoacrylate monomer, said alkyl cyanoacrylate monomer comprising only one cyanoacrylate function;

one poly(2-cyanoacrylate) monomer having the following formula (I):

wherein R is an organic moiety and n is an integer higher or equal to 2; and

a second part (component B) comprising a (meth)acrylate component having at least two (meth)acrylate functions.

22 . Two-part curable composition according to claim 21 , wherein the alkyl cyanoacrylate monomer has the general formula (II):

wherein R is a C 1 -C 18 linear or branched alkyl group.

23 . Two-part curable composition according to claim 21 , wherein the alkyl cyanoacrylate monomer is selected from the group consisting of methyl cyanoacrylate, ethyl cyanoacrylate, n-propyl cyanoacrylate, iso-propyl cyanoacrylate, n-butyl cyanoacrylate, sec-butyl cyanoacrylate, iso-butyl cyanoacrylate, tert-butyl cyanoacrylate, n-pentyl cyanoacrylate, 1-methylbutylcyanoacrylate, 1-ethylpropyl cyanoacrylate, neopentyl cyanoacrylate, n-hexyl cyanoacrylate, 1-methylpentyl cyanoacrylate, n-heptyl cyanoacrylate, n-octyl cyanoacrylate, 2-octyl cyanoacrylate, 2-ethylhexyl cyanoacrylate, n-nonyl cyanoacrylate, n-decyl cyanoacrylate, n-undecyl cyanoacrylate, and mixtures thereof.

24 . Two-part curable composition according to claim 21 , wherein the total content of alkyl cyanoacrylate monomer(s) in the first part is higher or equal to 55% by weight, based on the total weight of said first part.

25 . Two-part curable composition according to claim 21 , wherein the poly(2-cyanoacrylate) monomer has the following formula (I-1):

wherein R is an organic moiety.

26 . Two-part curable composition according to claim 21 , wherein in formulas (I) and (I-1), R is an alkylene, an alkenylene, a cycloalkylene, an arylene, an alkoxyalkylene, an aralkylene, or the divalent residue of a polymer.

27 . Two-part curable composition according to claim 21 , wherein in the formula (I-1), R represents —(CH 2 ) m with m being 2, 3, 4, 5, 6, 8, 9, 10 or 12.

28 . Two-part curable composition according to claim 21 , wherein the total content of poly(2-cyanoacrylate) monomer(s) in the first part is higher than 3% by weight, based on the total weight of the first part.

29 . Two-part curable composition according to claim 21 , wherein the first part of the composition further contains at least one additive selected from the group consisting of: a thixotropic agent, a thickening agent, a toughening agent, an accelerating agent, an adhesion promoter, a pigment, a colorant, a stabilizing agent, an antioxidant, a plasticizer, and mixtures thereof.

30 . Two-part curable composition according to claim 21 , wherein the component B comprises more than 80% by weight of the total of (meth)acrylate component(s), based on the total weight of said component B.

31 . Two-part curable composition according to claim 21 , wherein the (meth)acrylate component having at least two (meth)acrylate functions is selected from the group consisting of:

difunctional (meth)acrylate component;

polyfunctional (meth)acrylate component; and

mixtures thereof.

32 . Two-part curable composition according to claim 21 , wherein the component B comprises a mixture of: a difunctional (meth)acrylate component and a polyfunctional (meth)acrylate component, the component B comprising:

from 5% to 40% by weight of difunctional (meth)acrylate component(s); and

from 40% to 95% by weight of polyfunctional (meth)acrylate component(s).

33 . Two-part curable composition according to claim 21 , wherein the difunctional and polyfunctional (meth)acrylate component(s) are ethoxylated.

34 . Two-part curable composition according to claim 21 , wherein the component B comprises a nucleophilic initiator for cyanoacrylate polymerization.

35 . Two-part curable composition according to claim 21 , wherein the component B further contains at least one additive chosen from the group consisting of: a thixotropic agent, a thickening agent, a toughening agent, an accelerating agent, a per-compound, an adhesion promoter, a pigment, a colorant, a stabilizing agent, an antioxidant, a plasticizer, and mixtures thereof.

36 . Two-part curable composition according to claim 21 , wherein the volume ratio first part:second part ranges from 1:1 to 10:1.

37 . Two-part curable composition according to claim 21 , comprising:

a first part (component A) comprising:

from 60 wt % to 99 wt % of alkyl cyanoacrylate monomer(s), said alkyl cyanoacrylate monomer(s) comprising only one cyanoacrylate function;

from 3 wt % to 20 wt % of one poly(2-cyanoacrylate) monomer having the formula (I-1);

wherein R is an organic moiety

from 2 wt % to 10 wt % of thickener(s);

from 2 wt % to 10 wt % of thixotropic agent(s);

a second part (component B) comprising:

from 5% to 40% by weight, of difunctional (meth)acrylate component(s);

from 40% to 95% by weight, of polyfunctional (meth)acrylate component(s);

from 0.01% to 1% by weight of nucleophilic initiator(s); and

from 0% to 5% of thixotropic agent(s).

38 . Two-part curable composition according to claim 21 , characterized in that the component A does not comprise alkoxyalkyl cyanoacrylate.

39 . Syringe or cartridge or dispense heads comprising the two-part curable composition as defined in claim 21 .

40 . Method for bonding substrates comprising the steps of:

mixing together the two components of the two-part curable composition as defined in claim 21 ;

applying the mixing obtained above to at least one of the substrates,

mating together the substrates for a time sufficient to permit an adhesive bond to form between the mated substrates.