Compositions which are cross-linkable by heating, and corresponding self-adhesive articles

A heat-crosslinkable adhesive composition comprising:

• at least one polymer (A) comprising a hydrolyzable alkoxysilane group;
• at least one tackifying resin (B);
• from 2% to 30% by weight of at least one silsesquioxane resin (C) on the total weight of the adhesive composition;
• and
• at least one crosslinking catalyst (D),
• wherein the silsesquioxane resin (C) corresponds to the general formula (V):
• wherein each one from among R′1 to R′8 represents, independently of each other, a group chosen from:
• a hydrogen atom,
• a radical chosen from the group consisting of a linear or branched C1-C4 alkoxy radical, a linear or branched alkyl radical comprising from 1 to 30 carbon atoms, an alkenyl radical comprising from 2 to 30 carbon atoms, an aromatic radical comprising from 6 to 30 carbon atoms, an allyl radical comprising from 3 to 30 carbon atoms, a cyclic aliphatic radical comprising from 3 to 30 carbon atoms and an acyl radical comprising from 1 to 30 carbon atoms, and
• a group —OSiR′9R′10 wherein R′9 and R′10 each represents, independently of each other, a hydrogen atom or a radical chosen from the group consisting of linear or branched C1-C4 alkyls, linear or branched C1-C4 alkoxys, C2-C4 alkenyls, a phenyl, a C3-C6 allyl radical, a cyclic C3-C8 aliphatic radical and a C1-C4 acyl radical;
• on condition:
• that at least one radical from among the radicals R′1 to R′8 is a C1-C4 alkoxy radical;
• and
• that at least one radical from among the radicals R′1 to R′8 is a phenyl radical.