Uv-initiated thermally cross-linked acrylate pressure-sensitive adhesive substances

A process for preparing polyacrylate hotmelt pressure-sensitive adhesives from polymers formed from

• a) a comonomer mixture comprising
• a1) 55%-99% by weight, based on component (a), of acrylic acid and/or acrylic esters of the formula:
• CH2═C(R′)(COOR2),
• where R1═H or CH3 and R2 is an alkyl chain having 1-20 carbon atoms,
• a2) 0-30% by weight, based on component (a), of olefinically unsaturated monomers having functional groups selected from the group consisting of hydroxyl groups, sulfonic acid groups, ester groups, ether groups, anhydride groups, epoxy groups, amide groups and amino groups, or having aromatic, heteroaromatic and/or heterocyclic groups,
• a3) 1%-15% by weight, based on component (a), of acrylate or methacrylate monomers having at least one functional group which is capable of reacting with the base generated by a photobase generator b), with or without a catalyzing compound, and
• b) 0.01%-25% by weight, based on the overall comonomer mixture, of at least one photobase generator b
• where said photobase generator b) is incorporated into the comonomer mixture by mixing or copolymerization and where the solvent-free polymer or the polymer substantially freed from solvent, with the photobase generator incorporated therein, is coated, in a hotmelt process, onto a backing, and during or after coating is irradiated with UV light, thereby generating a base photochemically, and the composition is subsequently crosslinked thermally by the reaction of at least component a3) with the base.