Hitting sound reducing material and thermoplastic resin composition

A hitting sound reducing material made of a (meth)acrylic acid ester polymer (B) comprising:

• a polymer (b1) comprising a structural unit derived from an acrylic ester compound and a structural unit derived from a methacrylic ester compound, and having a glass transition temperature of −15° C. to +5° C.;
• and
• a polymer (b2) comprising at least one selected from the group consisting of a structural unit derived from a methacrylic acid ester compound, a structural unit derived from an aromatic vinyl compound, and a structural unit derived from a vinyl cyanide compound,
• wherein the polymer (b1) has a temperature (peak temperature) indicating a peak value of a main dispersion of tan δ measured by the following method of −5° C. to +20° C., and a peak intensity, which is a peak value of the intensity, of 2.055 or more,
• <Method for measuring Tan δ>
• A sheet having a thickness of 1.0 to 1.1 mm is molded by a heat press at a set temperature of 150° C. using the polymer (b1), and a measurement sample is prepared by cutting out a piece having a length of 36 mm and width of 10 mm from the sheet,
• Using the following dynamic viscoelasticity measurement device, 8 mm portions of each long side of the measurement sample are fixed with a tension jig, tan δ is measured under the following conditions, and the peak temperature and peak intensity are determined;
• Measuring device:
• Dynamic viscoelasticity measuring device (“DMA850” manufactured by TA Instruments Com)
• Mode:
• Tension
• Frequency:
• 1 Hz
• Heating rate:
• 5° C./min
• Measurement temperature:
• −60 to +60° C.