Process for preparing high-performance pressure-sensitive hotmelt adhesive compositions and the use thereof for producing self-adhesive tapes

Pressure-sensitive hotmelt adhesive composition based on non-thermoplastic elastomers, obtained by

• a) preparing, as the preliminary batch, a composition comprising the elastomers and one or more additives selected from the group consisting of fillers, anti-ageing agents, plasticizers and tackifier resins in an intensively shearing, intensively cooling mixer and without solvent, the composition having a final temperature of from 100.degree. C. to 160.degree. C.,
• b) mixing and homogenizing the preliminary batch in a second mixer with one or more additives selected from the group consisting of fillers, anti-ageing agents, plasticizers and tackifier resins, without solvent, the composition having a final temperature of from 100.degree. C. to 160.degree. C.,
• where the total residence time of the composition at temperatures over 100.degree. C. does not exceed 6 minutes, and
• c) adding a thermally activatable chemical crosslinking agent to the composition during or subsequent to step b),
• so that the resulting hotmelt adhesive composition has a viscosity of from 900 Pa*s to 1200 Pa*s, at 130.degree. C. and at a shear gradient of 100 s.sup.-1.