Patent ID: 7923510
Filing Date: 2011-04-12
Classification: C08L,C09J,Y10T

Abstract:
1. A heat-activatable adhesive sheet of an adhesive comprising a blend of at least three synthetic nitrile rubber compositions S1, S2, and S3, each of which comprises at least one synthetic nitrile rubber, and at least one reactive resin which is capable of crosslinking with itself, with other reactive resins and/or with the nitrile rubbers of synthetic rubber compositions S1, S2, and S3, in which: a) the nitrile rubber blend is microphase-separated, characterized by at least three different glass transition temperatures in a DSC (dynamic scanning calorimetry) thermogram; b) the nitrile rubber or rubbers S1 have (i) an acrylonitrile fraction of greater than or equal to 35% and (ii) a static glass transition temperature, in the DSC thermogram, of greater than or equal to −20° C.; c) the nitrile rubber or rubbers S2 have (i) an acrylonitrile fraction of greater than 25% and less than 35% and (ii) a static glass transition temperature, in the DSC thermogram, of less than −20° C.; and d) the nitrile rubber or rubbers S3 have (i) an acrylonitrile fraction of less than or equal to 25% and (ii) a static glass transition temperature, in the DSC thermogram, of less than or equal to −35° C.