Patent ID: 6872761

Claim:
A composition useful for forming an acoustic or vibration damping coating on a substrate surface, said composition comprising (a) from 8 to 30 weight percent water, (b) from 10 to 30 weight percent of at least two polymers in dispersed form, wherein at least one polymer I has a T g greater than 0 degrees C. and at least one polymer II is elastomeric and has a T g less than 0 degrees C. and the weight ratio of polymer I:polymer II is from about 3:1 to about 10:1, (c) from 30 to 65 weight percent of at least one particulate inorganic filler, and (d) from 0.5 to 5 weight percent expandable microspheres having a weight average particle size in the range of from about 5 to about 50 microns and a Tstart temperature in the range of from about 70 degrees C. to about 140 degrees C.