Acoustic damping element with improved stackability

A vibration and noise damping element comprising:

• a damping layer having a first surface and a second surface;
• and
• an adhesive layer covering at least a portion of the first surface of the damping layer, wherein:
• the damping layer is composed of a damping layer material with a viscosity at 60° C. of 30′000-500′000 Pa*s containing at least one rubber component Ru;
• the adhesive layer is composed of an adhesive layer material with a viscosity at 60° C. of 50′000-300′000 Pa*s containing the at least one rubber component Ru;
• a ratio of a thickness of the damping layer d1 to a thickness of the adhesive layer d2 (d1/d2) is 0.6-4.0;
• a sum of the thickness of the damping layer d1 and the thickness of the adhesive layer d2 (d1+d2) is 0.5-2.5 mm;
• the viscosity is determined according to DIN 54458 oscillographically by means of a rheometer with a heatable plate measured at gap 500 μm, measuring plate diameter:
• 25 mm (plate/plate), deformation 1%, angular frequency 10 rad/s;
• the adhesive layer comprises, based on a total weight of the adhesive laver:
• 1-15 wt.-% of at least one polybutadiene PB;
• 12.5-35 wt.-% of an at 25° C. liquid rubber LR;
• 4.5-15 wt-% of at least one natural polyisoprene or synthetic polyisoprene PI;
• 4.5-15 wt.-% of at least one butyl rubber BR;
• 5-12 wt.-% of at least one hydrocarbon resin HR;
• and
• 5-75 wt.-% of at least one solid particulate filler FM;
• and
• the damping layer comprises, based on a total weight of the damping layer:
• 10-18 wt.-% of at least one at 25° C. liquid rubber LR;
• 2-5 wt.-% of at least one butyl rubber BR;
• 0.5-3 wt-% of at least one natural polyisoprene or synthetic polyisoprene PI;
• 5-10 wt.-% of at least one hydrocarbon resin HR;
• and
• 50-80 wt-% of at least one solid particulate filler FM.