PURPOSE: To widen a temperature range for displaying damping ability in damping resin compositions for car parts by polymerizing the above compositions with a monomer to be a fixed glass transition temperature to a fixed polymerization rate, combining with the second monomer to be a fixed glass transition temperature to a fixed rate and graft polymerizing to a fixed polymerization rate, and then additionally combining as much as a fixed quantity for polymerization.
CONSTITUTION: A monomer to produce a polymer whose glass transition temperature is -20°C or below irrespectively of the existance of rubber component, for example a vinyl monomer, is polymerized to the polymerization rate of 50-93weight% for producing a rubber like polymer. A monomer 11 in which the glass transition temperature of the polymer is 60°C, or above for example vinyl monomer, is combined to 30-90weight% of the rubber like polymer at 5-30weight% and polymerized to the polymerization rate of 50%, and then the residue is additionally combined so that the total combination quantity of the monomer 11 may be 70-10weight% and further polymerized.
ISHIKAWA TATSUO
ERA SUSUMU
MUKOYAMA YOSHIYUKI
