US 12,215,218 B2
Hitting sound reducing material and thermoplastic resin composition
Kentaro Hiraishi, Tokyo (JP); Taichi Maruyama, Tokyo (JP); and Hironori Kitaguchi, Tokyo (JP)
Assigned to TECHNO-UMG CO., LTD., Tokyo (JP)
Appl. No. 18/726,823
Filed by TECHNO-UMG CO., LTD., Tokyo (JP)
PCT Filed Sep. 22, 2023, PCT No. PCT/JP2023/034461
§ 371(c)(1), (2) Date Jul. 5, 2024,
PCT Pub. No. WO2024/116569, PCT Pub. Date Jun. 6, 2024.
Claims priority of application No. 2022-192966 (JP), filed on Dec. 1, 2022.
Prior Publication US 2024/0425690 A1, Dec. 26, 2024
Int. Cl. C08L 25/16 (2006.01); C08L 69/00 (2006.01)
CPC C08L 25/16 (2013.01) [C08L 69/00 (2013.01); C08L 2203/30 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 5 Claims
OG exemplary drawing
 
1. 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.