Patent ID: 8137500

Claim:
A low-viscosity rubber damping composition that is sprayable through a slit nozzle comprising: a) 5.0-40.0% polybutadiene having a molecular weight of about 1000 and comprising about 40-50% vinyl, and, 2.0-10.0% polybutadiene with active carboxyl groups and having a molecular weight of about 1700; b) a vulcanization system selected from the group consisting of i) sulfur and one or more organic accelerator(s) and metal oxide(s); ii) peroxide vulcanization systems; and iii) quinones, quinone dioximes, or dinitrosobenzene, optionally in combination with organic accelerators and/or metal oxide(s); c) 0.5 to 5 wt% glass fibers having an average fiber length from 50 μm to 500 μm, a diameter of 5-10 microns, and a maximum fiber length of 1000-2000 μm; d) optionally, one or more further additives selected from the group consisting of: i) thermoplastic polymers in the form of finely comminuted powders; ii) fillers; iii) lightweight fillers; iv) tackifying agents and/or adhesion promoters; v) extender oils; vi) aging protection agents; and vii) rheology adjuvants; and, e) 15-25% graphite, the sum of constituents a) through e) adding up to 100 wt%, and wherein said composition does not contain solid rubbers and has a viscosity from 1000 mPa·s to 100,000 mPa·s, measured per DIN 53019 at 20° C.