Acrylic PSAs with narrow molecular weight distribution

A process for preparing acrylic pressure sensitive adhesives by means of radical polymerization of a monomer mixture to give a polyacrylate, wherein said polymerization is carried out with an initiator system comprising at least one triazolinyl compound of the general formula

• where R, R′, R″, R′″ are chosen independently of one another from the following group:
• branched and unbranched C1 to C18 alkyl radicals;
• C3 to C18 alkenyl radicals;
• C3 to C18 alkynyl radicals
• C1 to C18 alkoxy radicals
• C1 to C18 alkyl radicals substituted by at least one OH group or a halogen atom or a silyl ether;
• C3 to C18 alkenyl radicals;
• C3 to C18 alkynyl radicals
• C2-C18 hetero alkyl radicals having at least one oxygen atom and/or an NRIV group in the carbon chain, it being possible for RIV to be any organic radical
• C3-C18 alkenyl radicals, C3-C18 alkynyl radicals, C1-C18 alkyl radicals substituted by at least one ester group, amine group, carbonate group, cyano group, isocyano group and/or epoxide group and/or by sulfur
• C3-C12 cycloalkyl radicals
• C8-C10 aryl radicals
• hydrogen
• provided that R″ and R′″ cannot be hydrogen and that R″ and R′″ are joined together with one another to form a spiro compound.