Tesa Se

Sabine Thormeier

Thorsten Krawinkel

Stephan Buenz

Axel Burmeister

Matthias Seibert

Christian Kreft

Andreas Meier

Franziska Czerwonatis

Karsten Seitz

Franziska Zmarsly

Stephan Bünz

A pressure-sensitive adhesive consisting of a homogeneous mixture of at least one natural rubber component and at least one polyacrylate component displays significantly improved properties in cohesion and aging and weathering resistance compared to the individual components. Particularly good properties are achieved when the adhesive contains x % by weight of at least one natural rubber component, y % by weight of at least one polyacrylate component, v % by weight of at least one adhesive resin component and w % by weight of additives, where 10&#x2266;&#xd7;x&#x2266;80, 10&#x2266;y&#x3c;95, 0&#x2266;v&#x2266;50, 0&#x2266;w&#x2266;10 and x+y+v+w=100. A single- or double-sided adhesive tape consisting of at least one support and at least one layer of such a pressure-sensitive adhesive therefore likewise has good cohesion and aging resistance properties.

Pressure-sensitive adhesives based on natural rubber and polyacrylates

The in-line repair operations in the automotive industry require high-temperature masking tapes which satisfy a particular profile of requirements. Hence such masking tapes must be temperature-stable and must have a high crosslinking potential. Masking tapes employed are tapes coated with thermally crosslinking natural rubber (NR) adhesives which have a crosslinker resin/phenolic resin component. Thermally reactive pressure-sensitive adhesives of this kind are prepared by a process comprising a non-thermoplastic rubber constituent of the pressure-sensitive adhesive and a crosslinker system, the crosslinker system comprising a promoter component and as crosslinking component a reactive phenolic resin, where, in the process, the rubber constituent and a first component of the crosslinker system are mixed homogeneously in a mixing assembly, at a first processing temperature of the mixing assembly, to give a premix, a premix temperature being established in the premix; subsequently the premix is cooled from the premix temperature to a final composition temperature which is lower than the first premix temperature; and lastly the second component of the crosslinker system is added to the premix.

Process for preparing a thermally reactive pressure-sensitive adhesive

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Hamburg, Germany

Sabine Thormeier