Patent ID: 7429409

Claim:
Process for preparing crosslinked pressure-sensitive adhesives at least partly based on block copolymers comprising at least one polyvalent thioether unit, wherein at least the following process steps are carried out: two-stage or multi-stage free-radical addition polymerization of at least two copolymerizable monomers in the presence of at least one polyvalent mercaptan, at least one of the monomers comprising a functional group which on irradiation with ultraviolet rays initiates an ultraviolet (UV) crosslinking, the polymerization producing block copolymers containing at least one polyvalent thioether unit and having, in the uncrosslinked state, at least two glass transition temperatures, of which at least one is not higher than +15° C., and which differ from one another by at least 15° C., coating of the polymer from the melt onto a backing at a temperature of not more than 200° C., crosslinking of the polymer on the backing by irradiation with ultraviolet radiation.