Patent ID: 8680178
Filing Date: 2014-03-25
Classification: C08J,C08L,C09J

Abstract:
1. A process for preparing a thermally reactive pressure-sensitive adhesive, comprising a non-thermoplastic rubber constituent of the pressure-sensitive adhesive, and a crosslinker system, the crosslinker system comprising a promoter component and a reactive phenolic resin, wherein the process comprises (a) mixing the rubber constituent and a crosslinker system component selected from the group consisting of a promoter and a reactive phenolic resin 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, wherein the premix temperature is between about 140° C. and 200° C.; (b) cooling the premix from the premix temperature to a final composition temperature which is lower than the first premix temperature, wherein the final composition temperature is between about 110° C. and 130° C.; and (c) adding a crosslinker system component selected from the group consisting of a promoter and a reactive phenolic resin to the cooled premix, provided that if a promoter is added in step (a), then a reactive phenolic resin must be added in step (c) and that if a reactive phenolic resin is added in step (a) then a promoter must be added in step (c), wherein the crosslinker system component added in step (c) is added to the premix in a planetary roller extruder.