# US 12,215,218 B2 · Hitting sound reducing material and thermoplastic resin composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,218 B2 - Document ID: US12215218B2 - Status: Granted - Kind: B2 - Application number: 18/726,823 - Filed: 2023-09-22 - Published: 2024-12-26 - Granted: 2025-02-04 - Earliest claimed: 2022-12-01 - Assignees: Techno-Umg Co., Ltd. - Applicants: Techno-Umg Co., Ltd. - Inventors: Kentaro Hiraishi; Taichi Maruyama; Hironori Kitaguchi - Web page: https://patentgrep.com/patent/US12215218B2 ## CPC - C08L 25/16: Homopolymers or copolymers of alkyl-substituted styrenes - C08F 265/04: on to polymers of esters - C08F 279/04: Vinyl aromatic monomers and nitriles as the only monomers - C08L 25/12: with unsaturated nitriles - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - C08L 2203/30: used for thermoforming - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2205/03: containing three or more polymers in a blend - C08L 2205/035: containing four or more polymers in a blend - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract 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 of −5° C. to +20° C., and a peak intensity, which is a peak value of the intensity, of 2.055 or more. ## Claims ### Claim 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, 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. ### Claim 2 (depends on 1) The hammering sound reducing material according to claim 1, wherein the (meth)acrylic acid ester polymer (B) has a swelling degree of THF-insoluble component of 1000% or more as measured by the following method, After immersing the (meth)acrylic acid ester polymer (B) in tetrahydrofuran (THF) for 24 hours, the insoluble component separated through a centrifugal separation operation is vacuum-dried and its weight (weight b) is measured, After immersing the obtained THF-insoluble component in THF again for 24 hours, the weight (weight c) of the sample swollen with THF is measured, and the swelling degree of the THF-insoluble component is determined by the following formula, Swelling degree (%)=c/b×100. ### Claim 3 (depends on 1) A thermoplastic resin composition comprising a resin component (A) containing a rubber-reinforced styrenic thermoplastic resin (A1) and the hitting sound reducing material according to claim 1. ### Claim 4 (depends on 2) A thermoplastic resin composition comprising a resin component (A) containing a rubber-reinforced styrenic thermoplastic resin (A1) and the hitting sound reducing material according to claim 2. ### Claim 5 (depends on 3) The thermoplastic resin composition according to claim 3, wherein the thermoplastic resin composition contains 95 to 70 parts by mass of the resin component (A) and 5 to 30 parts by mass of the hitting sound reducing material (wherein, the total of the resin component (A) and the hitting sound reducing material is 100 parts by mass).