| 摘要 |
PROBLEM TO BE SOLVED: To obtain a highly damping material composition developing a high tanδ, having slight change with time, useful as a sound barrier of an acoustic room, etc. SOLUTION: An acrylic base polymer containing a basic polar side chain or the like is mixed with a hindered amine-based compound having 500-2,000 molecular weight as a damping providing agent. In this case, the hindered amine- based compound is preferably a condensate of 1,2,3,4-butanetetracarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinol andβ,β,β',β'-tetramethyl-3,9-(2,4,8,10- tetraoxaspiro[5,5]undecane)diethanol. The obtained stably develops a high tanδby excellent entanglement of the base polymer with the damping supplying agent, has a slight reduction rate in tanδby change with time and damping performances in a temperature range around a room temperature environment.
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