| abstract |
The present invention provides a foamed adhesive material layer comprising: a) from 41.7 wt % to 62.0 wt % of an elastomeric component, b) 37.7 wt % to 58.0 wt % of a tackifying resin component, c) 0 wt % to 15 wt % of a soft resin component, d) 0 wt % to 18 wt % of further additives and e) microballoons in an at least partially expanded state, preferably having a proportion of 0.3 wt % to 2.5 wt %, more preferably 0.5 wt % to 2.0 wt % and particularly preferably 0.7 wt % to 1.7 wt % including, wherein the elastomeric component (a) consists of at least 90 wt % of polyvinyl aromatic compound polydiene block copolymer, the tackifying resin component (b) contains from 4 wt % to 100 wt % of at least one type K1 for rosin oligomers having a softening temperature of at least 90° C. (Ring & Ball, test VI); and the density of the foamed adhesive material layer (Test IX) is at least 600 kg/m 3 and at most 920 kg/m 3 . |