Propylene resin composition and molded body

Abstract

To provide a propylene resin composition which enables manufacture of a molded body excellent in scratch resistance.SOLUTION: A propylene resin composition contains a bumper-derived recycled propylene resin composition A, and an HVAC unit-derived recycled propylene resin composition B.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a propylene resin composition and a molded article. [Background technology]

[0002] Molded articles made of propylene resin compositions are used as materials for automobiles, home appliances, and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-139421 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, molded articles used in automobile materials and the like are required to have high scratch resistance.

[0005] Therefore, an object of the present invention is to provide a propylene resin composition from which a molded article having excellent scratch resistance can be produced. Another object of the present invention is to provide a molded article having excellent scratch resistance. [Means for solving the problem]

[0006] The present invention relates to, but is not limited to, the following: [Invention A1] A recycled propylene resin composition A derived from bumpers, Recycled propylene resin composition B derived from HVAC units A propylene resin composition comprising: [Invention A2] The propylene resin composition according to Invention A1, wherein the bumper is an automobile bumper. [Invention A3] The propylene resin composition according to Invention A1 or A2, wherein the HVAC unit is an automotive HVAC unit. [Invention A4] The propylene resin composition according to any one of Inventions A1 to A3, wherein the recycled propylene resin composition A contains a propylene homopolymer. [Invention A5] The propylene resin composition according to any one of Inventions A1 to A4, wherein the recycled propylene resin composition B contains a propylene homopolymer. [Invention A6] The propylene resin composition according to any one of Inventions A1 to A5, wherein the recycled propylene resin composition A contains a heterophasic propylene polymerization material. [Invention A7] The propylene resin composition according to any one of Inventions A1 to A6, wherein the recycled propylene resin composition B contains a heterophasic propylene polymerization material. [Invention A8] The propylene resin composition according to any one of Inventions A1 to A7, wherein the recycled propylene resin composition A contains an ethylene-α-olefin copolymer. [Invention A9] The propylene resin composition according to any one of Inventions A1 to A8, wherein the recycled propylene resin composition B contains an ethylene-α-olefin copolymer. [Invention A10] The propylene resin composition according to any one of Inventions A1 to A9, wherein the recycled propylene resin composition A contains an inorganic filler. [Invention A11] The propylene resin composition according to any one of Inventions A1 to A10, wherein the recycled propylene resin composition B contains an inorganic filler. [Invention A12] The propylene resin composition according to any one of Inventions A1 to A11, which contains an ethylene-α-olefin copolymer C. [Invention A13] The propylene resin composition according to any one of Inventions A1 to A12, which contains virgin propylene polymer E. [Invention A14] The propylene resin composition according to any one of Inventions A1 to A13, which contains a filler F. [Invention A15] The propylene resin composition according to Invention A14, comprising an inorganic filler as filler F. [Invention A16] The propylene resin composition according to Invention A14 or A15, comprising a recycled filler as filler F. [Invention A17] 10 parts by weight to 90 parts by weight of a recycled propylene resin composition A; 10 to 90 parts by weight of recycled propylene resin composition B; The propylene resin composition according to any one of Inventions A1 to A16, comprising: [Invention A18] A propylene resin composition according to any one of Inventions A1 to A17, having a tensile breaking strain of 50% or more and a load of 2.0 N or more for causing whitened pin scratches by pin scratching. [Invention A19] A molded article comprising the propylene resin composition according to any one of Inventions A1 to A18.

[0007] Other aspects of the present invention relate to, but are not limited to: [Invention B1] A recycled propylene resin composition A derived from bumpers, Recycled propylene resin composition B derived from HVAC units A propylene resin composition comprising: Resin composition A has a melt flow rate of 20 g / 10 min or more and 60 g / 10 min or less at a temperature of 230°C and a load of 2.16 kgf, The weight ratio of the ash content in the resin composition A is 10% by weight or more and 25% by weight or less, The weight ratio of xylene insoluble components (CXIS components) in resin composition A is 46% by weight or more and 72% by weight or less, and the weight ratio of xylene soluble components (CXS components) in resin composition A is 28% by weight or more and 54% by weight or less, as measured by the following method; Resin composition B has a melt flow rate of 10 g / 10 min or more and 40 g / 10 min or less at a temperature of 230°C and a load of 2.16 kgf, The weight ratio of the ash content in the resin composition B is 5% by weight or more and 20% by weight or less, The weight ratio of the xylene-insoluble component (CXIS component) in the resin composition B is 81% by weight or more and 95% by weight or less, and the weight ratio of the xylene-soluble component (CXS component) in the resin composition B is 5% by weight or more and 19% by weight or less, measured by the following method: Propylene resin composition. <Method for Measuring the Weight Ratio of the CXIS Component and the CXS Component> About 4 g of the sample is refluxed with boiling xylene for 5 hours using a cylindrical filter paper and a Soxhlet extraction tube. Next, the extract is concentrated under reduced pressure using a rotary evaporator to obtain a polymer component. About 2 g of the obtained polymer component is precisely weighed (this "weight of the polymer component" is designated as "a"), and heated and dissolved in boiling xylene for 2 hours. Next, after cooling to 20°C, it is filtered using a filter paper. The filtered filtrate is concentrated under reduced pressure using a rotary evaporator to obtain a CXS component. The obtained CXS component is precisely weighed (this "weight of the CXS component" is designated as "b"). The weight ratio of the CXIS component and the weight ratio of the CXS component in the sample are calculated by the following formula using the numerical values a and b. Weight ratio of CXS component (% by weight) = (b / a) × 100 Weight ratio of CXIS component (% by weight) = 100 - weight ratio of CXS component (% by weight) [Invention B2] The propylene resin composition according to Invention B1, wherein the bumper is an automotive bumper. [Invention B3] The propylene resin composition according to Invention B1 or B2, wherein the HVAC unit is an automotive HVAC unit. [Invention B4] The propylene resin composition according to any one of Inventions B1 to B3, comprising an ethylene-α-olefin copolymer C. [Invention B5] The propylene resin composition according to any one of Inventions B1 to B4, comprising a virgin propylene polymer E. [Invention B6] The propylene resin composition according to any one of Inventions B1 to B5, comprising a filler F. [Invention B7] The propylene resin composition according to Invention B6, comprising an inorganic filler as filler F. [Invention B8] The propylene resin composition according to Invention B6 or B7, comprising a recycled filler as filler F. [Invention B9] 10 parts by weight to 90 parts by weight of a recycled propylene resin composition A; 10 to 90 parts by weight of recycled propylene resin composition B; The propylene resin composition according to any one of Inventions B1 to B8, comprising: [Invention B10] A propylene resin composition according to any one of Inventions B1 to B9, having a tensile breaking strain of 50% or more and a load of 2.0 N or more for causing whitened pin scratches by pin scratching. [Invention B11] A molded article comprising the propylene resin composition according to any one of Inventions B1 to B10. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a molded article having excellent scratch resistance and a propylene resin composition that is a raw material thereof. DETAILED DESCRIPTION OF THE INVENTION

[0009] definition In this specification, the term "propylene polymer" means a polymer having 50% by weight or more of monomer units derived from propylene, as will be explained in detail later. In this specification, the term "propylene resin composition" means a composition containing a propylene polymer, which will be explained in detail later. As used herein, the term "α-olefin" refers to an aliphatic unsaturated hydrocarbon having an α-position carbon-carbon unsaturated double bond. In this specification, the term "C4-12 hydrocarbon group" means a hydrocarbon group having 4 to 12 carbon atoms. The same applies to other similar expressions. In this specification, the term "ethylene-α-olefin copolymer" refers to a copolymer containing monomer units derived from ethylene and monomer units derived from an α-olefin having C4 or more (meaning 4 or more carbon atoms; the same applies to other similar expressions), and is substantially free of monomer units derived from propylene. This will be explained in detail later. As used herein, the term "heterophagic propylene polymer material" refers to a mixture containing a polymer I containing 80% by weight or more of monomer units derived from propylene (where the total weight of the polymer I is taken as 100% by weight), and a polymer II containing monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins and monomer units derived from propylene.

[0010] The expression "lower limit to upper limit" expressing a numerical range means "greater than or equal to the lower limit, less than or equal to the upper limit," and the expression "upper limit to lower limit" means "less than or equal to the upper limit, greater than or equal to the lower limit." That is, these expressions express a numerical range including the lower limit and the upper limit, but in one embodiment, one or both of the upper limit and the lower limit may be excluded, that is, "lower limit to upper limit" may express "more than the lower limit and less than the upper limit," "greater than or equal to the lower limit and less than the upper limit," or "more than the lower limit and less than the upper limit." Similarly, "xx or more" may express "more than xx," and "xx or less" may express "less than xx."

[0011] Hereinafter, several embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

[0012] Propylene resin composition The "propylene resin composition" of the present invention comprises a recycled propylene resin composition A derived from a bumper and a recycled propylene resin composition B derived from an HVAC unit. By molding such a propylene resin composition, a molded article having excellent scratch resistance can be produced. Furthermore, by using the propylene resin composition of the present invention, a molded article can be produced by a simple method such as injection molding, which is commonly used in the production of molded parts for automobiles, etc.

[0013] Each component indicated as "recycled propylene resin composition A" etc. may also be simply referred to as "component A" etc.

[0014] Each component will be described below.

[0015] Recycled propylene resin composition A derived from bumpers Component A is a propylene resin composition, which is a recycled component derived from bumpers.

[0016] In this specification, the term "recycled propylene resin composition" means a propylene resin composition that has been subjected to processing such as molding, or has been used for some final application, and then undergoes a recovery process and is reused. The same applies to other "recycled xxx" compositions.

[0017] In one embodiment, the process for preparing the recycled propylene resin composition may include optional steps other than the recovery step, such as a crushing step, a refining step, a melting step, a kneading step with other substances, and a pelletizing step. Examples of the refining step include washing with water, aqueous and / or oil-based chemicals, microbial treatment, magnetic separation, and gravity separation. Examples of the molded products include, but are not limited to, injection molded products.

[0018] As used herein, the term "virgin propylene polymer" refers to a propylene polymer that has not been molded into a product such as an automobile or a part thereof and has not been used for any end use after being produced by a process including a polymerization step. The same applies to other "virgin xxx" products.

[0019] As used herein, the term "bumper" refers to a shock absorber provided at the front, rear, or both sides of a vehicle to cushion the impact during a collision and reduce damage to the vehicle body, engine, and other vehicles, including occupants, cargo, and other vehicles. Although the meaning is redundant, examples of vehicles include cars, automobiles, motorcycles, trolleybuses, trains, and bicycles. In one embodiment, component A of the present invention is derived from automobile bumpers, i.e., refers to a propylene polymer that is reused after automobile bumpers that have been subjected to a recovery process are subjected to any process, such as a crushing process or a melting process.

[0020] Component A contains a propylene polymer. The weight ratio of the propylene polymer relative to the total weight of Component A is preferably 50% by weight or more, 60% by weight or more, 70% by weight or more, or 80% by weight or more. The weight ratio of the propylene polymer relative to the total weight of Component A is preferably 95% by weight or less, or 90% by weight or less.

[0021] Examples of the propylene polymer contained in Component A include a propylene homopolymer, a random copolymer of propylene and a monomer other than propylene, and a heterophasic propylene polymer material. The propylene resin composition of the present invention may contain only one type of Component A, or may contain two or more types. From the viewpoint of rigidity and impact resistance of a molded article, Component A preferably contains at least one selected from the group consisting of a propylene homopolymer and a heterophasic propylene polymer material.

[0022] The isotactic pentad fraction (also referred to as mmmm fraction) of the propylene polymer contained in component A is not particularly limited, but may be, for example, 1.000 or less, 0.998 or less, 0.995 or less, or 0.990 or less. The lower limit is also not particularly limited, but may be, for example, 0.900 or more, or 0.925 or more. From the viewpoint of rigidity and dimensional stability of a molded article made from the resin composition, the lower limit is preferably 0.950 or more.

[0023] The isotactic pentad fraction refers to the isotactic fraction in pentad units. In other words, the isotactic pentad fraction indicates the proportion of structures in which five consecutive propylene-derived monomer units are meso-bonded when viewed in pentad units. When the target component is a copolymer, the isotactic pentad fraction refers to a value measured for the chain of propylene-derived monomer units.

[0024] In this specification, the isotactic pentad fraction is 13 This refers to the value measured by C-NMR spectroscopy. 13 The ratio of the area of the mmmm peak to the area of all absorption peaks in the methyl carbon region obtained by C-NMR spectroscopy is defined as the isotactic pentad fraction. 13 The method for measuring the isotactic pentad fraction by C-NMR spectroscopy is described, for example, in Macromolecules, 6, 925 (1973) by A. Zambelli et al., where: 13 The assignment of absorption peaks obtained by C-spectrometry is based on the description in Macromolecules, 8, 687 (1975).

[0025] Propylene homopolymer When component A contains a propylene homopolymer, from the viewpoints of the fluidity of the resin composition when melted and the toughness of the molded body, the intrinsic viscosity ([η]) of the propylene homopolymer is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0026] In this specification, the intrinsic viscosity (unit: dL / g) is a value measured at a temperature of 135°C using tetralin as a solvent by the following method.

[0027] Using an Ubbelohde viscometer, the reduced viscosity is measured at three concentrations: 0.1 g / dL, 0.2 g / dL, and 0.5 g / dL. The reduced viscosity is plotted against the concentration, and the intrinsic viscosity is calculated by extrapolation, extrapolating the concentration to zero. The method for calculating the limiting viscosity by extrapolation is described, for example, on page 491 of "Polymer Solutions, Polymer Experiments 11" (published by Kyoritsu Shuppan Co., Ltd. in 1982).

[0028] The molecular weight distribution (Mw / Mn) of the propylene homopolymer is preferably 3.0 or more, more preferably 4.0 or more. The molecular weight distribution of Component A may be 30.0 or less, or may be 25.0 or less. The molecular weight distribution of Component A is preferably 3.0 to 30.0, more preferably 4.0 to 25.0.

[0029] As used herein, the molecular weight distribution refers to the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), calculated using the weight average molecular weight (Mw) and number average molecular weight (Mn) measured by gel permeation chromatography (GPC) under the following conditions: Equipment: Tosoh Corporation HLC-8121 GPC / HT Separation column: Tosoh Corporation GMHHR-H(S)HT (3 columns) Measurement temperature: 140℃ Carrier: Orthodichlorobenzene Flow rate: 1.0mL / min Sample concentration: approximately 1 mg / mL Sample injection volume: 400 μL Detector: Differential refraction Calibration curve creation method: Use standard polystyrene

[0030] The propylene homopolymer that can be contained in component A may be, for example, one produced by polymerizing propylene using a polymerization catalyst during the initial production.

[0031] Examples of polymerization catalysts include Ziegler catalysts; Ziegler-Natta catalysts; catalysts consisting of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane; catalysts consisting of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that reacts with the transition metal compound to form an ionic complex, and an organoaluminum compound; and catalysts modified by supporting catalytic components (a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that forms an ionic complex, an organoaluminum compound, etc.) on inorganic particles (silica, clay minerals, etc.).

[0032] Examples of the polymerization catalyst include those described in JP-A Nos. 61-218606, 5-194685, 7-216017, 9-316147, 10-212319, and 2004-182981.

[0033] In the initial production, a polymer obtained by prepolymerizing propylene in the presence of the polymerization catalyst may be used as the polymerization catalyst.

[0034] Examples of polymerization methods include bulk polymerization, solution polymerization, and gas-phase polymerization. Here, bulk polymerization refers to a method in which polymerization is carried out using an olefin that is liquid at the polymerization temperature as a medium, and solution polymerization refers to a method in which polymerization is carried out in an inert hydrocarbon solvent such as propane, butane, isobutane, pentane, hexane, heptane, or octane. Gas-phase polymerization refers to a method in which gaseous monomers are used as a medium and the gaseous monomers are polymerized in that medium.

[0035] Examples of the polymerization method include a batch method, a continuous method, and a combination thereof. The polymerization method may be a multi-stage method in which a plurality of polymerization reactors are connected in series.

[0036] From the viewpoint of industrial and economical excellence, the polymerization method is preferably a continuous gas phase polymerization method or a bulk-gas phase polymerization method in which a bulk polymerization method and a gas phase polymerization method are carried out continuously.

[0037] Various conditions in the polymerization step (polymerization conditions such as polymerization temperature, polymerization pressure, monomer concentration, catalyst input amount, and polymerization time) may be appropriately determined depending on the molecular structure of the target polymer.

[0038] Other steps may be carried out before or after the polymerization step. For example, after the polymerization step, the polymer may be dried at a temperature below the melting point of the polymer, if necessary, to remove residual solvent contained in the polymer and ultralow molecular weight oligomers produced as by-products during production. Examples of drying methods include those described in JP-A-55-75410 and JP-A-2565753.

[0039] Random copolymer of propylene and a monomer other than propylene The random copolymer of propylene and a monomer other than propylene contains monomer units derived from propylene and monomer units derived from a monomer other than propylene. When component A contains the random copolymer, the weight ratio of the monomer units derived from a monomer other than propylene in the random copolymer is preferably 0.01% by weight to 20% by weight relative to the total weight of the random copolymer.

[0040] Examples of the monomer other than propylene include ethylene and C4-12 α-olefins, preferably at least one selected from the group consisting of ethylene and C4-10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0041] Examples of the random copolymer include propylene-ethylene random copolymer, propylene-1-butene random copolymer, propylene-1-hexene random copolymer, propylene-1-octene random copolymer, propylene-ethylene-1-butene random copolymer, propylene-ethylene-1-hexene random copolymer, and propylene-ethylene-1-octene random copolymer.

[0042] When component A contains the random copolymer, from the viewpoint of fluidity of the resin composition when melted, the intrinsic viscosity ([η]) of the random copolymer is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0043] The molecular weight distribution (Mw / Mn) of the random polymer is preferably 3.0 or more, more preferably 4.0 or more. The molecular weight distribution of the random polymer may be 30.0 or less, or may be 25.0 or less. The molecular weight distribution of the random polymer is preferably 3.0 to 30.0, more preferably 4.0 to 25.0.

[0044] The random copolymer may be produced, for example, in the initial production, by polymerizing propylene and a monomer other than propylene according to a polymerization catalyst, polymerization method, polymerization system, and polymerization conditions that can be used in the production of the propylene homopolymer.

[0045] Heterophasic propylene polymer materials When component A contains a heterophasic propylene polymerization material, the heterophasic propylene polymerization material may be produced, for example, in an initial production run by carrying out a first polymerization step to form polymer I and a second polymerization step to form polymer II. These polymerization steps can be carried out in accordance with the polymerization catalyst, polymerization method, polymerization scheme, and polymerization conditions that can be used in the production of the propylene homopolymer. The total weight of polymer I and polymer II contained in the heterophasic propylene polymer material may be 100% by weight, relative to the total weight of the heterophasic propylene polymer material being 100% by weight.

[0046] As described above, Polymer I contains 80% by weight or more of monomer units derived from propylene. Polymer I may be, for example, a propylene homopolymer, or may contain monomer units derived from a monomer other than propylene. When Polymer I contains monomer units derived from a monomer other than propylene, the weight ratio of the monomer units derived from the monomer other than propylene to the total weight of Polymer I may be, for example, 0.01% by weight or more and less than 20% by weight.

[0047] Examples of the monomer other than propylene include ethylene and C4 or higher α-olefins, preferably at least one selected from the group consisting of ethylene and C4 to C10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0048] Examples of copolymers containing monomer units derived from a monomer other than propylene include propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, and propylene-ethylene-1-octene copolymer.

[0049] From the viewpoint of dimensional stability of the molded body, polymer I is preferably a propylene homopolymer, a propylene-ethylene copolymer, a propylene-1-butene copolymer, or a propylene-ethylene-1-butene copolymer, and more preferably a propylene homopolymer.

[0050] The isotactic pentad fraction of Polymer I may preferably be 1.000 or less, 0.998 or less, 0.995 or less, or 0.990 or less. The lower limit is not particularly limited, but may be, for example, 0.900 or more, 0.925 or more, or 0.950 or more.

[0051] The weight ratio of polymer I to the total weight of the heterophasic propylene polymer material is preferably 50% by weight to 99% by weight, and more preferably 60% by weight to 95% by weight.

[0052] As described above, polymer II contains monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins and monomer units derived from propylene. Preferably, polymer II contains 30% by weight or more of monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins, and also contains monomer units derived from propylene.

[0053] The weight ratio of the monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins to the total weight of polymer II may be 30% by weight to 70% by weight, or may be 35% by weight to 60% by weight.

[0054] In Polymer II, the at least one α-olefin selected from the group consisting of ethylene and C4 to C12 α-olefins is preferably at least one selected from the group consisting of ethylene and C4 to C10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, 1-octene, and 1-decene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0055] Examples of polymer II include propylene-ethylene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer, propylene-ethylene-1-decene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer and propylene-1-decene copolymer, preferably propylene-ethylene copolymer, propylene-1-butene copolymer or propylene-ethylene-1-butene copolymer, more preferably propylene-ethylene copolymer.

[0056] The weight ratio of polymer II to the total weight of the heterophasic propylene polymer material is preferably 1% by weight to 50% by weight, and more preferably 5% by weight to 40% by weight.

[0057] The weight ratio of the xylene insoluble components (CXIS components) in the heterophasic propylene polymerization material to the total weight of the heterophasic propylene polymerization material is preferably 50% by weight to 99% by weight, more preferably 60% by weight to 95% by weight.

[0058] The weight ratio of the xylene soluble component (CXS component) in the heterophasic propylene polymer material to the total weight of the heterophasic propylene polymer material is preferably 1 to 50% by weight, more preferably 5 to 40% by weight.

[0059] In the present invention, it is believed that the CXIS component in the heterophasic propylene polymer material is mainly composed of polymer I, and the CXS component in the heterophasic propylene polymer material is mainly composed of polymer II.

[0060] Examples of heterophasic propylene polymeric materials include (propylene)-(propylene-ethylene) polymeric materials, (propylene)-(propylene-ethylene-1-butene) polymeric materials, (propylene)-(propylene-ethylene-1-hexene) polymeric materials, (propylene)-(propylene-ethylene-1-octene) polymeric materials, (propylene)-(propylene-1-butene) polymeric materials, (propylene)-(propylene-1-hexene) polymeric materials, (propylene)-(propylene-1-octene) polymeric materials, and (propylene)-(propylene-1-decene) polymeric materials. (Propylene-ethylene)-(propylene-ethylene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-hexene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-octene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-decene) polymerization material, (propylene-ethylene)-(propylene-1-butene) polymerization material, (propylene-ethylene)-(propylene-1-hexene) polymerization material, (propylene-ethylene (propylene-1-octene) polymerization materials, (propylene-ethylene)-(propylene-1-decene) polymerization materials, (propylene-1-butene)-(propylene-ethylene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-butene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-hexene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-octene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-decene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-decene) polymerization materials, (propylene-1-butene)-( (propylene-1-butene) polymerization materials, (propylene-1-butene)-(propylene-1-hexene) polymerization materials, (propylene-1-butene)-(propylene-1-octene) polymerization materials, (propylene-1-butene)-(propylene-1-decene) polymerization materials, (propylene-1-hexene)-(propylene-1-hexene) polymerization materials, (propylene-1-hexene)-(propylene-1-octene) polymerization materials, (propylene-1-hexene)-(propylene-1-decene) polymerization materials, (propylene-1-octene)-(propylene-1-octene) polymerization materials,and (propylene-1-octene)-(propylene-1-decene) polymeric materials.

[0061] Here, the expression "(propylene)-(propylene-ethylene) polymer material" means "a heterophasic propylene polymer material in which polymer I is a propylene homopolymer and polymer II is a propylene-ethylene copolymer." The same applies to other similar expressions.

[0062] The heterophasic propylene polymeric material is preferably a (propylene)-(propylene-ethylene) polymeric material, a (propylene)-(propylene-ethylene-1-butene) polymeric material, a (propylene-ethylene)-(propylene-ethylene) polymeric material, a (propylene-ethylene)-(propylene-ethylene-1-butene) polymeric material, or a (propylene-1-butene)-(propylene-1-butene) polymeric material, and more preferably a (propylene)-(propylene-ethylene) polymeric material.

[0063] The intrinsic viscosity number ([η]I) of Polymer I is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0064] The intrinsic viscosity ([η]II) of the polymer II is preferably 1.00 dL / g to 10.00 dL / g, more preferably 2.00 dL / g to 10.00 dL / g, and even more preferably 2.00 dL / g to 9.00 dL / g.

[0065] The ratio ([η]II / [η]I) of the intrinsic viscosity number ([η]II) of polymer II to the intrinsic viscosity number ([η]I) of polymer I is preferably 1-20, more preferably 1-10.

[0066] An example of a method for measuring the intrinsic viscosity number ([η]I) of polymer I is a method in which polymer I formed is extracted from a reactor in which polymer I is formed, and the intrinsic viscosity number of the polymer is measured.

[0067] The intrinsic viscosity number ([η]II) of polymer II can be calculated, for example, by the following formula (6) using the intrinsic viscosity number ([η]Total) of the heterophasic propylene polymerization material, the intrinsic viscosity number ([η]I) of polymer I, and the weight ratio of polymer II and polymer I to the total weight of the heterophasic propylene polymerization material.

[0068] [η]II=([η]Total-[η]I×XI) / XII ···(6) [η]Total: Intrinsic viscosity of heterophasic propylene polymer material (dL / g) [η]I: Intrinsic viscosity number of polymer I (dL / g) XI: Weight ratio of polymer I to the total weight of heterophasic propylene polymer material (weight of polymer I / weight of heterophasic propylene polymer material) XII: Weight ratio of polymer II to the total weight of heterophasic propylene polymer material (weight of polymer II / weight of heterophasic propylene polymer material)

[0069] Here, XI and XII can be determined from the material balance during polymerization.

[0070] XII may be calculated using the following formula by measuring the heat of fusion of polymer I and the heat of fusion of the heterophasic propylene polymer material. XII=1-(ΔHf)T / (ΔHf)P (ΔHf)T: Heat of fusion of heterophasic propylene polymer material (J / g) (ΔHf)P: Heat of fusion of polymer I (J / g)

[0071] The intrinsic viscosity number ([η]CXIS) of the CXIS component is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0072] The intrinsic viscosity number ([η]CXS) of the CXS component is preferably 1.00 dL / g to 10.00 dL / g, more preferably 2.00 dL / g to 10.00 dL / g, and even more preferably 2.00 dL / g to 9.00 dL / g.

[0073] The ratio ([η]CXS / [η]CXIS) of the intrinsic viscosity number of the CXS component ([η]CXS) to the intrinsic viscosity number of the CXIS component ([η]CXIS) is preferably 1-20, more preferably 1-10.

[0074] The molecular weight distribution (Mw(I) / Mn(I)) of Polymer I is preferably 3.0 or more, and more preferably 4.0 or more.

[0075] The molecular weight distribution of the CXIS component (Mw(CXIS) / Mn(CXIS)) is preferably 3.0 or more, and more preferably 4.0 or more.

[0076] From the viewpoint of molding processability of the resin composition, the melt flow rate (MFR) of component A at a temperature of 230°C and a load of 2.16 kgf is preferably 5 g / 10 min or more, more preferably 10 g / 10 min or more, even more preferably 20 g / 10 min or more, and even more preferably 25 g / 10 min or more. The MFR of component A (temperature 230°C, load 2.16 kgf) is preferably 300 g / 10 min or less, more preferably 100 g / 10 min or less, and even more preferably 60 g / 10 min or less.

[0077] In this specification, the melt flow rate refers to a value measured in accordance with JIS K7210. The melt flow rate may be hereinafter referred to as MFR. The MFR of Component A, Component B, Component C, and the propylene resin composition of the present invention is measured at 230°C.

[0078] In one embodiment, Component A contains ash. The ash content of Component A refers to the component remaining as ash after heating Component A at 600° C. for 60 minutes. The weight ratio of the ash content is determined by the following method. <Method for measuring ash weight ratio> Heat the crucible at 600°C for 60 minutes using an electric furnace. Take out the crucible, cool it in a desiccator for 1 hour, and then weigh it using a precision balance. Weigh 10 g of the recycled propylene composition into the crucible, heat it at 600°C for 60 minutes using an electric furnace to completely ash it. Then, after cooling the crucible in a desiccator for 1 hour, measure the weight of the ash to the nearest 0.1 mg using a precision balance, and calculate the weight ratio (weight %) of the ash to Component A.

[0079] In one aspect, the weight ratio of the ash is 5 wt% or more, or 10 wt% or more, based on the total weight of Component A. In one aspect, the weight ratio of the ash is 40 wt% or less, 30 wt% or less, or 25 wt% or less, based on the total weight of Component A.

[0080] In one aspect, Component A contains a filler described below. When Component A contains a filler, most of the filler is included in the ash of Component A. When Component A contains a filler, the weight ratio of the filler is considered to generally correspond to the weight ratio of the ash of Component A.

[0081] In one aspect, Component A may contain an ethylene-α-olefin copolymer described below.

[0082] The weight ratio of the xylene-insoluble component (CXIS component) in Component A, measured by the following method, is preferably 30 wt% or more and 90 wt% or less, more preferably 40 wt% or more and 80 wt% or less, and even more preferably 46 wt% or more and 72 wt% or less. The weight ratio of the xylene-soluble component (CXS component) in Component A is preferably 10 wt% or more and 70 wt% or less, more preferably 20 wt% or more and 60 wt% or less, and even more preferably 28 wt% or more and 54 wt% or less. <Method for Measuring the Weight Ratios of the CXIS Component and the CXS Component> Approximately 4 g of component A is refluxed in boiling xylene for 5 hours using a cylindrical filter paper and a Soxhlet extraction tube. The extract is then concentrated under reduced pressure using a rotary evaporator to obtain a polymer component. Approximately 2 g of the resulting polymer component is precisely weighed (this "weight of polymer component" is designated "a") and dissolved in boiling xylene for 2 hours by heating. After cooling to 20°C, the solution is filtered using filter paper. The filtrate is then concentrated under reduced pressure using a rotary evaporator to obtain the CXS component. The resulting CXS component is precisely weighed (this "weight of CXS component" is designated "b"). The weight ratio of the CXIS component in component A and the weight ratio of the CXS component are calculated using the following formulas using the values a and b. The CXIS component can also be obtained by vacuum drying the solid remaining on the filter paper. Weight ratio of CXS components (wt%) = (b / a) × 100 Weight ratio of CXIS component (wt%) = 100 - Weight ratio of CXS component (wt%)

[0083] The CXIS component in component A is considered to be mainly composed of polymer I of the heterophasic propylene polymerization material contained in component A and / or propylene homopolymer. The CXS component in component A is considered to be mainly composed of polymer II of the heterophasic propylene polymerization material contained in component A and / or ethylene-α-olefin copolymer.

[0084] Recycled propylene resin composition B derived from HVAC units Component B is a propylene resin composition, a recycled component derived from HVAC units.

[0085] As used herein, the term "HVAC" is an abbreviation for "heating, ventilation, and air conditioning," and an HVAC unit regulates the temperature, humidity, etc. of air. An "HVAC unit" may also be simply referred to as an "air conditioning unit." In one embodiment, component B of the present invention refers to a propylene resin composition derived from an automotive HVAC unit, i.e., an automotive HVAC unit that has been subjected to a recovery process is reused after undergoing any process such as a crushing process or a melting process.

[0086] Component B contains a propylene polymer. The weight ratio of the propylene polymer relative to the total weight of Component B is preferably 50% by weight or more, 60% by weight or more, 70% by weight or more, or 80% by weight or more. The weight ratio of the propylene polymer relative to the total weight of Component B is preferably 95% by weight or less, or 90% by weight or less.

[0087] Examples of the propylene polymer contained in Component B include a propylene homopolymer, a random copolymer of propylene and a monomer other than propylene, and a heterophasic propylene polymer material. The propylene resin composition of the present invention may contain only one type of Component B, or may contain two or more types. From the viewpoint of rigidity and impact resistance of a molded article, Component B preferably contains at least one selected from the group consisting of a propylene homopolymer and a heterophasic propylene polymer material.

[0088] The isotactic pentad fraction (also referred to as mmmm fraction) of the propylene polymer contained in component B is not particularly limited, but may be, for example, 1.000 or less, 0.998 or less, 0.995 or less, or 0.990 or less. The lower limit is also not particularly limited, but may be, for example, 0.900 or more, or 0.925 or more. From the viewpoint of rigidity and dimensional stability of a molded article made from the resin composition, the lower limit is preferably 0.950 or more.

[0089] Propylene homopolymer When component B contains a propylene homopolymer, from the viewpoints of the fluidity of the resin composition when melted and the toughness of the molded body, the intrinsic viscosity ([η]) of the propylene homopolymer is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0090] The molecular weight distribution (Mw / Mn) of the propylene homopolymer is preferably 3.0 or more, more preferably 4.0 or more. The molecular weight distribution of Component B may be 30.0 or less, or may be 25.0 or less. The molecular weight distribution of Component B is preferably 3.0 to 30.0, more preferably 4.0 to 25.0.

[0091] The propylene homopolymer that can be contained in Component B may be, for example, one produced by polymerizing propylene using a polymerization catalyst during the initial production. In the polymerization, the above-mentioned polymerization catalyst, polymerization method, polymerization system, and polymerization conditions may be appropriately determined depending on the molecular structure of the target polymer.

[0092] Random copolymer of propylene and a monomer other than propylene The random copolymer of propylene and a monomer other than propylene contains monomer units derived from propylene and monomer units derived from a monomer other than propylene. When component B contains the random copolymer, the weight ratio of the monomer units derived from a monomer other than propylene in the random copolymer is preferably 0.01% by weight to 20% by weight relative to the total weight of the random copolymer.

[0093] Examples of the monomer other than propylene include ethylene and C4-12 α-olefins, preferably at least one selected from the group consisting of ethylene and C4-10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0094] Examples of the random copolymer include propylene-ethylene random copolymer, propylene-1-butene random copolymer, propylene-1-hexene random copolymer, propylene-1-octene random copolymer, propylene-ethylene-1-butene random copolymer, propylene-ethylene-1-hexene random copolymer, and propylene-ethylene-1-octene random copolymer.

[0095] When component B contains the random copolymer, from the viewpoint of fluidity of the resin composition when melted, the intrinsic viscosity ([η]) of the random copolymer is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0096] The molecular weight distribution (Mw / Mn) of the random polymer is preferably 3.0 or more, more preferably 4.0 or more. The molecular weight distribution of the random polymer may be 30.0 or less, or may be 25.0 or less. The molecular weight distribution of the random polymer is preferably 3.0 to 30.0, more preferably 4.0 to 25.0.

[0097] The random copolymer may be produced, for example, in the initial production, by polymerizing propylene and a monomer other than propylene according to a polymerization catalyst, polymerization method, polymerization system, and polymerization conditions that can be used in the production of the propylene homopolymer.

[0098] Heterophasic propylene polymer materials When component B contains a heterophasic propylene polymerization material, the heterophasic propylene polymerization material may be produced, for example, in an initial production run by carrying out a first polymerization step to form polymer I and a second polymerization step to form polymer II. These polymerization steps can be carried out in accordance with the polymerization catalyst, polymerization method, polymerization scheme, and polymerization conditions that can be used in the production of the propylene homopolymer. The total weight of polymer I and polymer II contained in the heterophasic propylene polymer material may be 100% by weight, relative to the total weight of the heterophasic propylene polymer material being 100% by weight.

[0099] As described above, Polymer I contains 80% by weight or more of monomer units derived from propylene. Polymer I may be, for example, a propylene homopolymer, or may contain monomer units derived from a monomer other than propylene. When Polymer I contains monomer units derived from a monomer other than propylene, the weight ratio of the monomer units derived from the monomer other than propylene to the total weight of Polymer I may be, for example, 0.01% by weight or more and less than 20% by weight.

[0100] Examples of the monomer other than propylene include ethylene and C4 or higher α-olefins, preferably at least one selected from the group consisting of ethylene and C4 to C10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0101] Examples of copolymers containing monomer units derived from a monomer other than propylene include propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, and propylene-ethylene-1-octene copolymer.

[0102] From the viewpoint of dimensional stability of the molded body, polymer I is preferably a propylene homopolymer, a propylene-ethylene copolymer, a propylene-1-butene copolymer, or a propylene-ethylene-1-butene copolymer, and more preferably a propylene homopolymer.

[0103] The isotactic pentad fraction of Polymer I may preferably be 1.000 or less, 0.998 or less, 0.995 or less, or 0.990 or less. The lower limit is not particularly limited, but may be, for example, 0.900 or more, 0.925 or more, or 0.950 or more.

[0104] The weight ratio of polymer I to the total weight of the heterophasic propylene polymer material is preferably 50% by weight to 99% by weight, and more preferably 60% by weight to 95% by weight.

[0105] As described above, polymer II contains monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins and monomer units derived from propylene. Preferably, polymer II contains 30% by weight or more of monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins, and also contains monomer units derived from propylene.

[0106] The weight ratio of the monomer units derived from at least one α-olefin selected from the group consisting of ethylene and C4-12 α-olefins to the total weight of polymer II may be 30% by weight to 70% by weight, or may be 35% by weight to 60% by weight.

[0107] In Polymer II, the at least one α-olefin selected from the group consisting of ethylene and C4 to C12 α-olefins is preferably at least one selected from the group consisting of ethylene and C4 to C10 α-olefins, more preferably at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, 1-octene, and 1-decene, and even more preferably at least one selected from the group consisting of ethylene and 1-butene.

[0108] Examples of polymer II include propylene-ethylene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer, propylene-ethylene-1-decene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer and propylene-1-decene copolymer, preferably propylene-ethylene copolymer, propylene-1-butene copolymer or propylene-ethylene-1-butene copolymer, more preferably propylene-ethylene copolymer.

[0109] The weight ratio of polymer II to the total weight of the heterophasic propylene polymer material is preferably 1% by weight to 50% by weight, and more preferably 5% by weight to 40% by weight.

[0110] The weight ratio of the xylene insoluble components (CXIS components) in the heterophasic propylene polymerization material to the total weight of the heterophasic propylene polymerization material is preferably 50% by weight to 99% by weight, more preferably 60% by weight to 95% by weight.

[0111] The weight ratio of the xylene soluble component (CXS component) in the heterophasic propylene polymer material to the total weight of the heterophasic propylene polymer material is preferably 1 to 50% by weight, more preferably 5 to 40% by weight.

[0112] In the present invention, it is believed that the CXIS component in the heterophasic propylene polymer material is mainly composed of polymer I, and the CXS component in the heterophasic propylene polymer material is mainly composed of polymer II.

[0113] Examples of heterophasic propylene polymeric materials include (propylene)-(propylene-ethylene) polymeric materials, (propylene)-(propylene-ethylene-1-butene) polymeric materials, (propylene)-(propylene-ethylene-1-hexene) polymeric materials, (propylene)-(propylene-ethylene-1-octene) polymeric materials, (propylene)-(propylene-1-butene) polymeric materials, (propylene)-(propylene-1-hexene) polymeric materials, (propylene)-(propylene-1-octene) polymeric materials, and (propylene)-(propylene-1-decene) polymeric materials. (Propylene-ethylene)-(propylene-ethylene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-hexene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-octene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-decene) polymerization material, (propylene-ethylene)-(propylene-1-butene) polymerization material, (propylene-ethylene)-(propylene-1-hexene) polymerization material, (propylene-ethylene (propylene-1-octene) polymerization materials, (propylene-ethylene)-(propylene-1-decene) polymerization materials, (propylene-1-butene)-(propylene-ethylene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-butene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-hexene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-octene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-decene) polymerization materials, (propylene-1-butene)-(propylene-ethylene-1-decene) polymerization materials, (propylene-1-butene)-( (propylene-1-butene) polymerization materials, (propylene-1-butene)-(propylene-1-hexene) polymerization materials, (propylene-1-butene)-(propylene-1-octene) polymerization materials, (propylene-1-butene)-(propylene-1-decene) polymerization materials, (propylene-1-hexene)-(propylene-1-hexene) polymerization materials, (propylene-1-hexene)-(propylene-1-octene) polymerization materials, (propylene-1-hexene)-(propylene-1-decene) polymerization materials, (propylene-1-octene)-(propylene-1-octene) polymerization materials,and (propylene-1-octene)-(propylene-1-decene) polymeric materials.

[0114] Here, the expression "(propylene)-(propylene-ethylene) polymer material" means "a heterophasic propylene polymer material in which polymer I is a propylene homopolymer and polymer II is a propylene-ethylene copolymer." The same applies to other similar expressions.

[0115] The heterophasic propylene polymeric material is preferably a (propylene)-(propylene-ethylene) polymeric material, a (propylene)-(propylene-ethylene-1-butene) polymeric material, a (propylene-ethylene)-(propylene-ethylene) polymeric material, a (propylene-ethylene)-(propylene-ethylene-1-butene) polymeric material, or a (propylene-1-butene)-(propylene-1-butene) polymeric material, and more preferably a (propylene)-(propylene-ethylene) polymeric material.

[0116] The intrinsic viscosity number ([η]I) of Polymer I is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0117] The intrinsic viscosity ([η]II) of the polymer II is preferably 1.00 dL / g to 10.00 dL / g, more preferably 2.00 dL / g to 10.00 dL / g, and even more preferably 2.00 dL / g to 9.00 dL / g.

[0118] The ratio ([η]II / [η]I) of the intrinsic viscosity number ([η]II) of polymer II to the intrinsic viscosity number ([η]I) of polymer I is preferably 1-20, more preferably 1-10.

[0119] The intrinsic viscosity ([η]I) of Polymer I can be measured, for example, by the method described above for Polymer I of the heterophasic propylene polymer material as Component A.

[0120] The intrinsic viscosity ([η]II) of Polymer II can be measured, for example, by the method described above for Polymer II of the heterophasic propylene polymer material as Component A.

[0121] The intrinsic viscosity number ([η]CXIS) of the CXIS component is preferably 0.10 dL / g to 2.00 dL / g, more preferably 0.50 dL / g to 1.50 dL / g, and even more preferably 0.70 dL / g to 1.40 dL / g.

[0122] The intrinsic viscosity number ([η]CXS) of the CXS component is preferably 1.00 dL / g to 10.00 dL / g, more preferably 2.00 dL / g to 10.00 dL / g, and even more preferably 2.00 dL / g to 9.00 dL / g.

[0123] The ratio ([η]CXS / [η]CXIS) of the intrinsic viscosity number of the CXS component ([η]CXS) to the intrinsic viscosity number of the CXIS component ([η]CXIS) is preferably 1-20, more preferably 1-10.

[0124] The molecular weight distribution (Mw(I) / Mn(I)) of Polymer I is preferably 3.0 or more, and more preferably 4.0 or more.

[0125] The molecular weight distribution of the CXIS component (Mw(CXIS) / Mn(CXIS)) is preferably 3.0 or more, and more preferably 4.0 or more.

[0126] From the viewpoint of moldability of the resin composition, the MFR (temperature 230°C, load 2.16 kgf) of component B is preferably 5 g / 10 min or more, more preferably 10 g / 10 min or more, and even more preferably 25 g / 10 min or more. The MFR (temperature 230°C, load 2.16 kgf) of component B is preferably 300 g / 10 min or less, more preferably 100 g / 10 min or less, even more preferably 60 g / 10 min or less, and even more preferably 40 g / 10 min or less.

[0127] In one embodiment, Component B contains ash. The ash content of Component B refers to the component remaining as ash after heating Component B at 600°C for 60 minutes. The weight ratio of the ash content can be measured by the method described above for Component A.

[0128] In one embodiment, the weight ratio of the ash content is 5% by weight or more, or 10% by weight or more, relative to the total weight of Component B. In another embodiment, the weight ratio of the ash content is 40% by weight or less, 30% by weight or less, 25% by weight or less, or 20% by weight or less, relative to the total weight of Component B.

[0129] In one embodiment, Component B contains a filler, as described below. When Component B contains a filler, the majority of the filler is contained in the ash content of Component B. When Component B contains a filler, the weight ratio of the filler is considered to roughly correspond to the weight ratio of the ash content of Component B.

[0130] In one embodiment, component B may include an ethylene-α-olefin copolymer as described below.

[0131] The weight ratio of xylene-insoluble components (CXIS components) in Component B is preferably 50% by weight or more and 99% by weight or less, more preferably 60% by weight or more and 95% by weight or less, and even more preferably 81% by weight or more and 95% by weight or less. The weight ratio of xylene-soluble components (CXS components) in Component B is preferably 1% by weight or more and 50% by weight or less, more preferably 5% by weight or more and 40% by weight or less, and even more preferably 5% by weight or more and 19% by weight or less. The weight ratios of CXIS components and CXS components can be measured by the method described above for Component A.

[0132] The CXIS component in component B is considered to be mainly composed of polymer I of the heterophasic propylene polymer material contained in component B and / or propylene homopolymer. The CXS component in component B is considered to be mainly composed of polymer II of the heterophasic propylene polymer material contained in component B and / or ethylene-α-olefin copolymer.

[0133] Ethylene-α-olefin copolymer C In one embodiment, the resin composition of the present invention contains an ethylene-α-olefin polymer C. The ethylene-α-olefin polymer C may be an ethylene-α-olefin block polymer Cb, an ethylene-α-olefin random polymer Cr, or a mixture thereof.

[0134] In component C, the total of the monomer units derived from ethylene and the monomer units derived from a C4 or higher α-olefin contained in component C may be 100% by weight, relative to the total weight of component C (100% by weight).

[0135] Examples of C4 or higher α-olefins include C4 to C12 α-olefins. Examples of C4 to C12 α-olefins include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene, and 1-butene, 1-hexene, and 1-octene are preferred. The α-olefins may be α-olefins having a cyclic structure, such as vinylcyclopropane and vinylcyclobutane.

[0136] Examples of component C include ethylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-1-octene copolymers, ethylene-1-decene copolymers, ethylene-(3-methyl-1-butene) copolymers, and copolymers of ethylene and an α-olefin having a cyclic structure.

[0137] The weight ratio of the monomer units derived from C4 or higher α-olefins relative to the total weight of component C is preferably 1 to 49% by weight, more preferably 5 to 49% by weight, and even more preferably 24 to 49% by weight.

[0138] From the viewpoint of impact resistance of the molded body, the density of component C is preferably 0.85 g / cm 3 ~0.89g / cm 3 and more preferably 0.85 g / cm 3 ~0.88g / cm 3and more preferably 0.85 g / cm 3 ~0.87g / cm 3 is.

[0139] The MFR of component C (temperature 230°C, load 2.16 kgf) is preferably 0.1 g / 10 minutes to 80 g / 10 minutes.

[0140] Manufacturing method of component C Component C can be produced by polymerizing ethylene and a C4 or higher α-olefin using a polymerization catalyst.

[0141] Examples of polymerization catalysts include homogeneous catalysts such as metallocene catalysts and Ziegler-Natta catalysts.

[0142] Examples of homogeneous catalysts include a catalyst composed of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane; a catalyst composed of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that reacts with the transition metal compound to form an ionic complex, and an organoaluminum compound; and a catalyst modified by supporting a catalyst component (a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that forms an ionic complex, an organoaluminum compound, etc.) on inorganic particles (silica, clay minerals, etc.).

[0143] An example of a Ziegler-Natta catalyst is a catalyst that combines a titanium-containing solid transition metal component with an organometallic component.

[0144] Commercially available products may be used as component C. Examples of commercially available component C include Engage (registered trademark) manufactured by Dow Chemical Japan, Tafmer (registered trademark) manufactured by Mitsui Chemicals, Inc., Neozex (registered trademark) and Ultozex (registered trademark) manufactured by Prime Polymer Co., Ltd., and Excellen FX (registered trademark), Sumikathen (registered trademark), and Esprene SPO (registered trademark) manufactured by Sumitomo Chemical Co., Ltd.

[0145] Other recycled propylene resin composition D In one embodiment, the resin composition of the present invention includes a recycled propylene resin composition D other than components A and B. Examples of the propylene polymer contained in component D include a propylene homopolymer, a random copolymer of propylene and a monomer other than propylene, and a heterophasic propylene polymer material. The descriptions given for components A and B may be applied to these.

[0146] Examples of raw materials for component D, i.e., raw materials to be recycled (subjected to the recovery step), include used interior parts of automobiles (instrument panels, door trims, etc.), exterior parts of automobiles other than bumpers, other automobile parts (battery cases, etc., excluding HVAC units), packaging containers (retort pouches for food, refill pouches, detergent bottles, etc.), housings for household electrical appliances, office supplies (trays, etc.), and daily household items (contact lens cases, etc.). The recovery process is not particularly limited, and known methods can be used, for example.

[0147] Virgin propylene polymer E In one embodiment, the resin composition of the present invention includes virgin propylene polymer E. Examples of component E include propylene homopolymers, random copolymers of propylene and a monomer other than propylene, and heterophasic propylene polymer materials. The same descriptions given for components A and B may be applied to these materials.

[0148] Filler F In one embodiment, the resin composition of the present invention comprises a filler F.

[0149] Examples of Component F include inorganic fillers and organic fillers. The propylene resin composition of the present invention may contain only one type of Component F, or may contain two or more types thereof.

[0150] Inorganic fillers include glass, silicate minerals, alumina, silica, silicon dioxide, titanium oxide, iron oxide, aluminum oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, carbonate minerals, calcium sulfate, magnesium sulfate, basic magnesium sulfate, calcium sulfite, carbon black, and cadmium sulfide.

[0151] Organic fillers include polyesters, aromatic polyamides, cellulose and vinylon.

[0152] The shape of the filler may be plate-like, needle-like, or fibrous.

[0153] From the viewpoint of the rigidity, impact resistance and dimensional stability of the molded article, component F is preferably an inorganic filler, more preferably talc, which is a plate-like silicate mineral.

[0154] From the viewpoints of rigidity, impact resistance, and dimensional stability of the molded article, the average particle size D50[L] of component F is preferably 20.0 μm or less, and more preferably 15.0 μm or less. The average particle size D50[L] of component F may be 2.0 μm or more, or may be 4.0 μm or more. The average particle size D50[L] of component F is preferably 2.0 μm to 20.0 μm, and more preferably 4.0 μm to 15.0 μm. In one embodiment, the average particle size D50[L] of component F may be 7.0 μm to 15.0 μm. From the viewpoint of rigidity, impact resistance and dimensional stability of the molded article, the average particle size D50[S] of component F is preferably 5.0 μm or less, more preferably 3.0 μm or less. The average particle size D50[S] of component F may be 0.5 μm or more, or may be 1.0 μm or more. The average particle size D50[S] of component F is preferably 0.5 μm to 5.0 μm, and more preferably 1.0 μm to 3.0 μm. In one embodiment, the average particle size D50[S] of component F may be 2.0 μm to 5.0 μm. From the viewpoint of rigidity and dimensional stability of the molded article, the ratio of the average particle diameter D50[L] to the average particle diameter D50[S] of component F (D50[L] / D50[S]) may be 1.5 or more, or 2.5 or more. D50[L] / D50[S] may be 10 or less, or 8 or less. D50[L] / D50[S] may be 1.5 to 10, 1.5 to 8, 2.5 to 10, or 2.5 to 8. In one embodiment, D50[L] / D50[S] may be 3.0 to 8.

[0155] In this specification, "average particle diameter D50[L]" is determined based on volume-based particle diameter distribution measurement data measured by laser diffraction in accordance with the method specified in JIS R1629, and refers to the particle diameter when the cumulative number of particles from the smallest particle diameter reaches 50% in the particle diameter distribution measurement data (50% equivalent particle diameter). The particle diameter defined in this way is generally referred to as the "50% equivalent particle diameter" and is expressed as "D50". In this specification, the term "average particle diameter D50 [S]" is determined based on volume-based particle diameter distribution measurement data measured by centrifugal sedimentation in accordance with the method specified in JIS R1619, and refers to the particle diameter when the cumulative number of particles from the smaller particle diameter side reaches 50% in the particle diameter distribution measurement data (50% equivalent particle diameter). The larger the ratio (D50[L] / D50[S]) of the average particle diameter D50[L] of component F to the average particle diameter D50[S], the more excellent the rigidity and dimensional stability of the molded body.

[0156] Component F may be a virgin filler or a filler contained in a recycled resin composition.

[0157] Weight ratio of each component In the propylene resin composition of the present invention, the weight ratio of each component is not particularly limited. From the viewpoint of the scratch resistance and / or tensile breaking strain of a molded article, the weight ratio of component A may be 1 to 99 parts by weight, 5 to 95 parts by weight, 10 to 90 parts by weight, 20 to 80 parts by weight, or 30 to 70 parts by weight, relative to 100 parts by weight of the total content of components A to F contained therein or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention. From the viewpoint of the scratch resistance and / or tensile breaking strain of a molded article, the weight ratio of component B may be 1 to 99 parts by weight, 5 to 95 parts by weight, 10 to 90 parts by weight, 20 to 80 parts by weight, or 30 to 70 parts by weight, relative to 100 parts by weight of the total content of components A to F contained therein or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention. From the viewpoint of the scratch resistance and / or tensile breaking strain of the molded body, the weight ratio of component B relative to 100 parts by weight of component A may be 1 to 99 parts by weight, 5 to 95 parts by weight, 10 to 90 parts by weight, 20 to 80 parts by weight, 30 to 70 parts by weight, or 40 to 60 parts by weight.

[0158] When the propylene resin composition of the present invention contains component C, from the viewpoint of the scratch resistance and / or tensile breaking strain of the molded article, the weight ratio of component C may be 0 to 50 parts by weight, 0.1 to 40 parts by weight, 1 to 30 parts by weight, or 5 to 25 parts by weight, relative to 100 parts by weight of the total content of components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention.

[0159] When the propylene resin composition of the present invention contains Component D, from the viewpoint of the scratch resistance and / or tensile breaking strain of the molded article, the weight ratio of Component D may be 0 to 80 parts by weight, 1 to 60 parts by weight, 5 to 50 parts by weight, 10 to 40 parts by weight, 10 to 35 parts by weight, or 15 to 25 parts by weight, relative to 100 parts by weight of the total content of Components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention.

[0160] When the propylene resin composition of the present invention contains Component E, from the viewpoint of the scratch resistance and / or tensile breaking strain of the molded article, the weight ratio of Component E may be 0 to 80 parts by weight, 1 to 60 parts by weight, 5 to 50 parts by weight, 10 to 40 parts by weight, 10 to 35 parts by weight, or 15 to 25 parts by weight, relative to 100 parts by weight of the total content of Components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention.

[0161] When the propylene resin composition of the present invention contains Component F, from the viewpoint of the scratch resistance and / or tensile strain at break of the molded article, the weight ratio of Component F may be 0 to 80 parts by weight, 1 to 60 parts by weight, 5 to 50 parts by weight, 10 to 40 parts by weight, 10 to 35 parts by weight, or 15 to 25 parts by weight, relative to 100 parts by weight of the total content of Components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention. In one embodiment, from the viewpoint of the elastic modulus, the weight ratio of Component F may be 25 to 35 parts by weight, or 30 to 35 parts by weight, relative to 100 parts by weight of the total content of Components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention.

[0162] The total weight ratio of components A to F relative to the total weight of the propylene resin composition or molded article of the present invention is preferably 50% by weight or more. More preferably, the total weight ratio of components A to E is 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, or 90% by weight or more. Even more preferably, the total weight ratio of components A, B, D, and E is 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, or 90% by weight or more. Even more preferably, the total weight ratio of components A and B is 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more, or 90% by weight or more.

[0163] Method for producing propylene resin composition The propylene resin composition of the present invention can be obtained by melt-kneading the raw material components. The temperature during melt-kneading may be 180°C or higher, 180°C to 300°C, or 180°C to 250°C.

[0164] For melt kneading, a Banbury mixer, a single-screw extruder, a twin-screw co-rotating extruder, or the like can be used.

[0165] The order in which the raw material components are kneaded is not particularly limited. For example, components A to F may be kneaded all at once, or some of components A to F may be kneaded first, and then the resulting mixture may be kneaded with the other components.

[0166] The shape of the propylene resin composition is not particularly limited, and the propylene resin composition may be in the form of, for example, a strand, a sheet, a plate, or a pellet. The pellet-shaped resin composition can be produced, for example, by forming a strand-shaped resin composition and then cutting it to an appropriate length.

[0167] From the viewpoint of the moldability of the resin composition and the production stability when producing a molded article, the shape of the resin composition before being molded into a molded article is preferably in the form of pellets with a length of about 1 mm to 50 mm.

[0168] The propylene resin composition of the present invention may contain components other than those described above. Examples of such components include neutralizing agents, antioxidants, ultraviolet absorbers, nucleating agents, lubricants, antistatic agents, antiblocking agents, processing aids, organic peroxides, colorants (inorganic pigments, organic pigments, pigment dispersants, etc.), foaming agents, foam nucleating agents, plasticizers, flame retardants, crosslinking agents, crosslinking aids, brightness enhancers, antibacterial agents, and light diffusing agents. Examples of nucleating agents include metal carboxylates such as lithium benzoate, sodium benzoate, aluminum benzoate, aluminum 4-tert-butylbenzoate, and sodium adipate; sodium bis(4-tert-butylphenyl)phosphate; metal acid phosphate esters other than the compounds represented by the general formula (1); and polyhydric alcohol derivatives such as dibenzylidene sorbitol, bis(methylbenzylidene)sorbitol, and bis(dimethylbenzylidene)sorbitol. From the viewpoint of dimensional stability, metal carboxylates and bis(dimethylbenzylidene)sorbitol are preferred. The propylene resin composition of the present invention may contain only one kind of these components, or may contain two or more kinds of them. When the propylene resin composition of the present invention contains a nucleating agent, from the viewpoint of dimensional stability, the weight ratio of the nucleating agent may be 0.01 to 1.0 parts by weight, 0.05 to 0.5 parts by weight, or 0.1 to 0.5 parts by weight, relative to 100 parts by weight of the total content of components A to F or 100 parts by weight of the total weight of the propylene resin composition or molded article of the present invention.

[0169] Properties of propylene resin compositions In one embodiment, the MFR (temperature 230°C, load 2.16 kgf) of the propylene resin composition of the present invention is preferably 15 g / 10 min to 70 g / 10 min, may be 25 g / 10 min to 65 g / 10 min, or may be 35 g / 10 min to 60 g / 10 min. From the viewpoint of molding processability, the MFR (temperature 230°C, load 2.16 kgf) of the propylene resin composition is preferably 15 g / 10 min or more. From the viewpoint of impact strength of the obtained molded article, the MFR (temperature 230°C, load 2.16 kgf) of the propylene resin composition is preferably 70 g / 10 min or less. In one embodiment, from the viewpoint of dimensional stability, the MFR (temperature 230°C, load 2.16 kgf) of the propylene resin composition of the present invention is preferably 15 g / 10 min to 50 g / 10 min, may be 15 g / 10 min to 35 g / 10 min, or may be 15 g / 10 min to 30 g / 10 min.

[0170] In one embodiment, the density of the propylene resin composition of the present invention is preferably 1.1 g / cm 3 or less, more preferably 1.08 g / cm 3 More preferably, it is 1.06 g / cm or less. 3 The following is the result. In one embodiment, from the viewpoint of dimensional stability, the density of the propylene resin composition of the present invention is preferably 1.08 g / cm 3 ~1.2g / cm 3 and more preferably 1.1 g / cm 3 ~1.18g / cm 3 is.

[0171] The density of the propylene resin composition of the present invention is measured by the water displacement method, which is Method A described in JIS K7112.

[0172] In one embodiment, the tensile strain at break of the propylene resin composition of the present invention is 50% or more, or may be 60% or more, or may be 70% or more. The tensile strain at break can be measured by the method described in the Examples.

[0173] In one embodiment, the load required to cause whitened pin scratches by pin scratching the propylene resin composition of the present invention is 2.0 N or more, or may be 2.2 N or more, or may be 2.4 N or more. The pin scratch resistance evaluation test is carried out by the method described in the Examples.

[0174] The propylene resin composition of the present invention can be used as a material for forming a molded article by molding. The propylene resin composition of the present invention is preferably used as an injection molding material. Hereinafter, an example of an injection molded article produced using the propylene resin composition of the present invention as an injection molding material will be described.

[0175] Molded body The molded article of the present invention is made of the propylene resin composition of the present invention. The molded article of the present invention has excellent scratch resistance. The molded article is preferably an injection molded article.

[0176] The injection-molded article can be produced by injection molding. Examples of injection molding methods include general injection molding, injection foam molding, supercritical injection foam molding, ultra-high speed injection molding, injection compression molding, gas-assisted injection molding, sandwich molding, sandwich foam molding, and insert-outsert molding. There are no particular limitations on the shape of the injection-molded article.

[0177] The injection-molded article of the present invention can be preferably used for, for example, automotive materials, home appliance materials, and containers, and is particularly suitable for automotive interior and exterior applications. Examples of automotive interior and exterior parts include door trims, pillars, instrument panels, and bumpers. [Example]

[0178] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples.

[0179] In the examples and comparative examples, the following raw materials were used.

[0180] Component A-1: Recycled propylene resin composition derived from bumpers A recycled propylene resin composition A-1 was prepared as component A. The composition had the following characteristics: MFR (230°C, 2.16 kg load): 49.8 g / 10 min Ash content: 18.1% by weight CXIS amount: 70.0% by weight CXS amount: 30.0% by weight

[0181] Component A-2: Recycled propylene resin composition derived from bumpers A recycled propylene resin composition A-2 was prepared as component A. The composition had the following characteristics: MFR (230°C, 2.16 kg load): 44.9 g / 10 min Ash content: 11.4% by weight CXIS amount: 68.8% by weight CXS amount: 31.2% by weight

[0182] The MFR was measured under conditions of 230°C and a load of 2.16 kgf in accordance with JIS K7210-1:2014 and K7210-2:2014.

[0183] Component B-1: Recycled propylene resin composition derived from HVAC units Used polypropylene HVAC units collected from automobiles were crushed, and the crushed material was used to prepare a recycled propylene resin composition B-1 as component B. This composition has the following characteristics. MFR (230°C, 2.16 kg load): 37.5 g / 10 min Ash content: 15.2% by weight CXIS amount: 92.9% by weight CXS amount: 7.1% by weight

[0184] Component B-2: Recycled propylene resin composition derived from HVAC units Used polypropylene HVAC units collected from automobiles were crushed, and the crushed material was used to prepare a recycled propylene resin composition B-2 as component B. This composition has the following characteristics. MFR (230°C, 2.16 kg load): 13.7 g / 10 min Ash content: 7.6% by weight CXIS amount: 89.7% by weight CXS amount: 10.3% by weight

[0185] Examples 1 to 5 and Comparative Example 1

[0186] Production of propylene resin composition The components of the recycled propylene resin composition A derived from bumpers and the recycled propylene resin composition B derived from HVAC units were crushed to a diameter of approximately 9 mm and then uniformly pre-mixed in the weight ratios shown in Table 1. The mixture was then melt-kneaded using a twin-screw kneader (KZW-15 / 45MG (cylinder inner diameter 15.5 mm, screw outer diameter 15.0 mm, L / D=45) manufactured by Technovel Co., Ltd.) to produce a pellet-shaped propylene resin composition.

[0187] The melt-kneading conditions are as follows: Cylinder temperature 20:0℃ Screw rotation speed: 500 rpm Screen mesh: Two layers of 100 mesh and 50 mesh Extrusion rate: 6 kg / hr

[0188] Manufacturing of injection molded products for tensile breaking strain evaluation The obtained pellet-like resin composition was injection molded under the following conditions within the range specified in JIS K7152 to produce an injection-molded test piece with a thickness of 2 mm for evaluation. The resin composition melted in the injection molding machine was fed into the mold cavity through the gate. Injection molding machine: Toyo Machinery & Metal Co., Ltd. Si30III (mold clamping force 30 tons, cylinder diameter 18 mm) Cylinder temperature: 220℃ Mold temperature: 50℃ Injection speed: 20mm / sec Cooling time: 30 seconds

[0189] Tensile test (tensile breaking strain, unit: %) Using the test pieces molded by the above method, the tensile elongation at break was evaluated at a tensile speed of 50 mm / min according to the method specified in JIS K7161. The evaluation results are shown in Table 1.

[0190] Manufacture of injection molded products for scratch resistance evaluation The obtained pellet-like resin composition was injection molded under the following conditions to produce an injection-molded test piece for evaluation, measuring 80 mm in length, 35 mm in width, and 2.0 mm in thickness. The resin composition melted in the injection molding machine was fed into the mold cavity through the gate. Injection molding machine: Toyo Machinery & Metal Co., Ltd. Si30III (clamping force 30 tons) Cylinder temperature: 220℃ Mold temperature: 50℃ Injection speed: 20mm / sec Cooling time: 30 seconds

[0191] Scratch resistance evaluation The test pieces molded by the above method were used to measure the load at which the pin scratches turned white using a pin scratch hardness tester 318 (standard pin) manufactured by Erichsen. The evaluation results are shown in Table 1. [Table 1]

Claims

1. A recycled propylene resin composition A derived from bumpers; Recycled propylene resin composition B derived from HVAC units and A propylene resin composition comprising: Resin composition A has a melt flow rate of 20 g / 10 min or more and 60 g / 10 min or less at a temperature of 230° C. and a load of 2.16 kgf, The weight ratio of the ash content in the resin composition A is 10% by weight or more and 25% by weight or less, The weight ratio of the xylene insoluble component (CXIS component) in the resin composition A is 46% by weight or more and 72% by weight or less, and the weight ratio of the xylene soluble component (CXS component) in the resin composition A is 28% by weight or more and 54% by weight or less, as measured by the following method; Resin composition B has a melt flow rate of 10 g / 10 min or more and 40 g / 10 min or less at a temperature of 230° C. and a load of 2.16 kgf, The weight ratio of the ash content in the resin composition B is 5% by weight or more and 20% by weight or less, The weight ratio of the xylene-insoluble component (CXIS component) in the resin composition B is 81% by weight or more and 95% by weight or less, and the weight ratio of the xylene-soluble component (CXS component) in the resin composition B is 5% by weight or more and 19% by weight or less, as measured by the following method: Propylene resin composition. <Method for measuring the weight ratio of CXIS component and CXS component> Approximately 4 g of a sample is refluxed in boiling xylene for 5 hours using a cylindrical filter paper and a Soxhlet extraction tube. The extract is then concentrated under reduced pressure using a rotary evaporator to obtain a polymer component. Approximately 2 g of the obtained polymer component is precisely weighed (this "weight of polymer component" is referred to as "a") and dissolved by heating in boiling xylene for 2 hours. Next, after cooling to 20°C, the solution is filtered using filter paper. The separated filtrate is concentrated under reduced pressure using a rotary evaporator to obtain a CXS component. The obtained CXS component is precisely weighed (this "weight of CXS component" is referred to as "b"). The weight ratio of the CXIS component and the weight ratio of the CXS component in the sample are calculated using the following formulas using the values a and b. Weight ratio of CXS component (% by weight) = (b / a) x 100 Weight ratio of CXIS component (wt%) = 100 - Weight ratio of CXS component (wt%)

2. The propylene resin composition according to claim 1, wherein the bumper is an automobile bumper.

3. 2. The propylene resin composition of claim 1, wherein the HVAC unit is an automotive HVAC unit.

4. The propylene resin composition according to claim 1, comprising an ethylene-α-olefin copolymer C.

5. The propylene resin composition according to claim 1, comprising virgin propylene polymer E.

6. The propylene resin composition according to claim 1, further comprising a filler F.

7. The propylene resin composition according to claim 6, wherein the filler F is an inorganic filler.

8. The propylene resin composition according to claim 6, wherein the filler F is a recycled filler.

9. 10 to 90 parts by weight of a recycled propylene resin composition A; 10 to 90 parts by weight of recycled propylene resin composition B; The propylene resin composition according to claim 1, comprising:

10. 2. The propylene resin composition according to claim 1, wherein the tensile breaking strain is 50% or more and the load required to cause whitened pin scratches by pin scratching is 2.0 N or more.

11. A molded article comprising the propylene resin composition according to any one of claims 1 to 10.

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