# US 11,999,841 B2 · Thermoplastic resin composition having high rigidity and low coefficient of linear thermal expansion and molded article comprising same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,841 B2 - Document ID: US11999841B2 - Status: Granted - Kind: B2 - Application number: 17/858,565 - Filed: 2022-07-06 - Published: 2023-01-26 - Granted: 2024-06-04 - Earliest claimed: 2021-07-09 - Assignees: Hyundai Motor Company; Kia Corporation; Gs Caltex Corporation - Applicants: Hyundai Motor Company; Kia Corporation; Gs Caltex Corporation - Inventors: Jin Young Yoon; Hee Joon Lee; Dong Eun Cha; Sun Jun Kwon; Chun Ho Park; Seung Ryong Jeong; Seok Jin Yong; Hyung Tak Lee - Web page: https://patentgrep.com/patent/US11999841B2 ## CPC - C08L 23/14: Copolymers of propene (C08L23/16 takes precedence) - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - 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 2205/06: having improved processability or containing aids for moulding methods - C08L 2205/24: Crystallisation aids - C08L 2207/04: Thermoplastic elastomer - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract The present disclosure provides a thermoplastic resin composition having high rigidity and a low coefficient of linear thermal expansion and a molded article including the same. The thermoplastic resin composition includes a first propylene-ethylene copolymer, a second propylene-ethylene copolymer, a thermoplastic elastomer, an inorganic filler, and a sodium-phosphate-based nucleating agent as appropriate, and thus a molded article produced therefrom can exhibit improved mechanical rigidity, impact resistance, and dimensional stability. Even when formed to a low thickness for weight reduction, the molded article can be imparted with excellent processability, high tensile strength, a high flexural modulus, and high impact strength. ## Claims ### Claim 1 A thermoplastic resin composition comprising: a first propylene-ethylene copolymer having a melt index of 100 g/10 min to 150 g/10 min measured at a temperature of 230° C. under a load of 2.16 kg; a second propylene-ethylene copolymer having a melt index of 20 g/10 min to 40 g/10 min measured at a temperature of 230° ° C. under a load of 2.16 kg; a thermoplastic elastomer comprising a first elastomer having a melt index of 0.5 g/10 min to 1 g/10 min measured at a temperature of 230° C. under a load of 2.16 kg and a second elastomer of a melt index of 20 g/10 min to 40 g/10 min measured at a temperature of 230° ° C. under a load of 2.16 kg; an inorganic filler; and a sodium-phosphate-based nucleating agent; wherein the inorganic filler has an average particle diameter of 2 μm or less. ### Claim 2 (depends on 1) The thermoplastic resin composition of claim 1, wherein the first propylene-ethylene copolymer comprises 6 wt % to 10 wt % of ethylene based on a total weight thereof. ### Claim 3 (depends on 1) The thermoplastic resin composition of claim 1, wherein the second propylene-ethylene copolymer has impact strength of 60 J/m or more at room temperature (25° C.). ### Claim 4 (depends on 1) The thermoplastic resin composition of claim 1, wherein the second propylene-ethylene copolymer comprises 2 wt % to 5 wt % of ethylene based on a total weight thereof. ### Claim 5 (depends on 1) The thermoplastic resin composition of claim 1, wherein the thermoplastic elastomer comprises the first elastomer and the second elastomer at a mass ratio of 1:0.5-2. ### Claim 6 (depends on 1) The thermoplastic resin composition of claim 1, wherein the thermoplastic elastomer comprises at least one selected from the group consisting of: a copolymer of ethylene and α-olefin having 4 to 12 carbon atoms, a styrene-diene copolymer, and combinations thereof. ### Claim 7 (depends on 1) The thermoplastic resin composition of claim 1, wherein the inorganic filler has an aspect ratio of 20 or more. ### Claim 8 (depends on 1) The thermoplastic resin composition of claim 1, wherein the inorganic filler comprises at least one selected from the group consisting of: talc, silica, wollastonite, mica, calcium carbonate, barium sulfate, magnesium oxide, calcium silicate, and combinations thereof. ### Claim 9 (depends on 1) The thermoplastic resin composition of claim 1, wherein the sodium-phosphate-based nucleating agent comprises a compound represented by Chemical Formula 1: in Chemical Formula 1, R1 and R2 are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, Chemical Formula 2: or Chemical Formula 3: in which R1 and R2 are linked to each other, and in Chemical Formulas 2 and 3, R is independently a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, m is an integer from 0 to 3, and n is an integer from 0 to 3. ### Claim 10 (depends on 1) The thermoplastic resin composition of claim 1, wherein the sodium-phosphate-based nucleating agent comprises a compound represented by Chemical Formula 4: in Chemical Formula 4, R is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, and m is an integer of 0-3. ### Claim 11 (depends on 1) The thermoplastic resin composition of claim 1, comprising: 40 wt % to 55 wt % of the first propylene-ethylene copolymer; 5 wt % to 10 wt % of the second propylene-ethylene copolymer; 15 wt % to 25 wt % of the thermoplastic elastomer; 22 wt % to 30 wt % of the inorganic filler; and 0.2 wt % to 2 wt % of the sodium-phosphate-based nucleating agent. ### Claim 12 (depends on 1) The thermoplastic resin composition of claim 1, further comprising at least one additive selected from the group consisting of: an antioxidant, an ultraviolet absorber, a nucleating agent, a coupling agent, a dispersant, a light stabilizer, a processing lubricant, a slipping agent, an antistatic agent, an inorganic pigment, and combinations thereof. ### Claim 13 (depends on 1) A molded article comprising the thermoplastic resin composition of claim 1. ### Claim 14 (depends on 13) The molded article of claim 13, wherein the molded article is at least one automobile exterior material selected from the group consisting of: a side sill molding, door molding, fender molding, quarter glass molding, roof rack, side outer garnish, roof molding garnish, back panel molding, tailgate garnish, and combinations thereof.