Aqueous vibration damping compositions
The present invention provides an aqueous polymer dispersion for vibration damping comprising a film-forming polymer in the form of dispersed particles comprising a polymer phase P1 and different polymer phases P2 and P3; the polymer dispersion obtained by free radical emulsion polymerization. Controlling the difference in glass transition temperatures of the polymers in the various polymer phases results in effective sound damping as determined by a Damping Loss Factor of at least 0.1 over a temperature range of at least 40° C. determined at a frequency of 200 Hz over a temperature range of −10 to 65° C. Use of a chain transfer agent in the polymerization of the various monomer charges results in good appearance in the resultant vibration damping coating.
PPG Industries Ohio, Inc.
C G C C C C C C C C C
C08F G10K C08F C08L C09D C09D C08L C08K C08K C09D C08K
inventional inventional inventional inventional inventional inventional inventional additional inventional inventional inventional
Wei Tien-Chieh David Umesh C.
Wang Chao Fenn Desai