Pressure-sensitive adhesives having a temperature-stable adhesive power

A heat-curable adhesive composition comprising:

• from 20 to 85% of a polyurethane comprising 2 hydrolyzable alkoxysilane end groups and of formula (I):
• in which:
• R1 represents a hydrocarbon-based divalent radical comprising from 5 to 15 carbon atoms which may be aromatic or aliphatic, linear, branched or cyclic;
• R2 represents a linear or branched alkylene divalent radical comprising from 1 to 4 carbon atoms;
• R3 represents a linear alkylene divalent radical comprising from 1 to 3 carbon atoms;
• R4 and R5, which are identical or different, each represent a linear or branched alkyl radical having 1 to 4 carbon atoms, with the possibility, when there are several R4 or R5 radicals, that these are identical or different;
• n is an integer such that the number-average molecular weight of the polyether block of formula —[OR2]n— is between 300 Da and 30 kDa;
• m is an integer such that the number-average molecular weight of the polymer of formula (I) is between 600 Da and 60 kDa;
• p is an integer equal to 0, 1 or 2;
• from 15 to 80% of a compatible tackifying resin, having a number-average molecular weight between 200 Da and 5 kDa, that is a resin obtained:
• (i) by polymerization of terpene hydrocarbons and of phenols, in the presence of Friedel-Crafts catalysts;
• or
• (ii) by polymerization of α-methylstyrene, and optionally by reaction with phenols;
• and
• from 0.01 to 3% of a curing catalyst.