Polypropylene resin composition

Abstract

This polypropylene-based resin composition contains 15-65 wt% of a propylene random copolymer (A'), 3-40 wt% of a propylene polymer (A) having a melt peak temperature at 160°C or higher in a melting curve measured using a differential scanning calorimeter, 10-35 wt% of an ethylene-α-olefin copolymer (B), 20-30 wt% of glass fibers (C), and 0.1-5 wt% of an acid-modified polyolefin (D). The composition also contains, with respect to 100 parts by weight thereof, 0.01-1 parts by weight of a nucleating agent (E) represented by general formula (I).　Provided is a polypropylene-based resin composition from which a molded article having excellent scratch resistance can be obtained efficiently (at a short molding cycle).

Description

[Technical Field]

[0001] The present invention relates to a polypropylene resin composition. [Background technology]

[0002] Molded articles obtained by molding polypropylene-based resin compositions are used in various applications, such as automotive interior materials such as instrument panels and home appliance materials. These applications require properties such as scratch resistance. For example, Patent Document 1 describes that molded articles with excellent scratch resistance can be produced from a propylene-based resin composition containing a propylene-ethylene random copolymer, an ethylene-α-olefin copolymer, a fibrous filler, and modified polypropylene. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2015 / 005239 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the resin composition described in Patent Document 1 has a problem of a long molding cycle. (In injection molding, after a molten resin is injected into a mold, the molten resin is cooled and solidified before the molded article is removed from the mold. The "crystallization time" of a composition is an index of the time required for the molten resin to solidify.) Under these circumstances, the problem that the present invention aims to solve is to provide a polypropylene-based resin composition that can efficiently (in a short molding cycle) produce molded articles with excellent scratch resistance (i.e., that combines excellent scratch resistance with an efficient molding cycle). [Means for solving the problem]

[0005] The present inventors have conducted extensive research in light of the above background and have completed the present invention. That is, the present invention is as follows. [1] The propylene random copolymer (A') is 15% by weight or more and 65% by weight or less, a propylene polymer (A) having a melting peak temperature of 160°C or higher in a melting curve measured using a differential scanning calorimeter in an amount of 3% by weight or more and 40% by weight or less; The ethylene-α-olefin copolymer (B) is 10% by weight or more and 35% by weight or less, The glass fiber (C) is 20% by weight or more and 30% by weight or less, For 100 parts by weight of a composition containing 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D), A polypropylene resin composition containing 0.01 to 1 part by weight of a nucleating agent (E) represented by the following general formula (I) (wherein the total amount of (A'), (A), (B), (C) and (D) is 100% by weight): [ka] [In formula (I), M1 and M2 are the same or different and are at least one metal cation selected from alkali metals, alkaline earth metals, and monobasic aluminum; and R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are the same or different and are each selected from the group consisting of hydrogen, C1-C9 alkyl (wherein any two alkyl groups may be joined together to form a hydrocarbon ring having up to 6 carbon atoms), hydroxy, C1-C9 alkoxy, C1-C9 alkyleneoxy, amine, C1-C9 alkylamine, halogen (fluorine, chlorine, bromine, and iodine), and phenyl.]

[0006] Below, [2] to [8] are each preferred aspects or embodiments of the present invention. [2] The polypropylene resin composition according to [1], which has a crystallization temperature of 120°C or higher as measured by differential scanning calorimetry (DSC). [3] The polypropylene resin composition according to [1] or [2], further comprising a lubricant (F). [4] The polypropylene resin composition according to [3], wherein the lubricant (F) contains a fatty acid amide. [5] The polypropylene resin composition according to [3] or [4], wherein the content of the lubricant (F) is 0.1% by weight or more and 1.0% by weight or less (where the total amount of (A'), (A), (B), (C), and (D) is taken as 100% by weight). [6] The polypropylene resin composition according to any one of [1] to [5], wherein in formula (I), M1 and M2 are the same or different and each represents an alkali metal. [7] The polypropylene resin composition according to any one of [1] to [6], wherein in formula (I), M1 and M2 are sodium. [8] A molded article comprising the polypropylene resin composition according to any one of [1] to [7]. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a polypropylene resin composition from which molded articles having excellent scratch resistance can be obtained efficiently (in a short molding cycle). DETAILED DESCRIPTION OF THE INVENTION

[0008] The polypropylene resin composition of the present invention is as follows. The propylene random copolymer (A') is 15% by weight or more and 65% by weight or less, a propylene polymer (A) having a melting peak temperature of 160°C or higher in a melting curve measured using a differential scanning calorimeter in an amount of 3% by weight or more and 40% by weight or less; The ethylene-α-olefin copolymer (B) is 10% by weight or more and 35% by weight or less, The glass fiber (C) is 20% by weight or more and 30% by weight or less, For 100 parts by weight of a composition containing 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D), A polypropylene resin composition containing 0.01 to 1 part by weight of a nucleating agent (E) represented by the following general formula (I): [ka] [In formula (I), M1 and M2 are the same or different and are at least one metal cation selected from alkali metals, alkaline earth metals, and monobasic aluminum; and R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are the same or different and are each selected from the group consisting of hydrogen, C1-C9 alkyl (wherein any two alkyl groups may be joined together to form a hydrocarbon ring having up to 6 carbon atoms), hydroxy, C1-C9 alkoxy, C1-C9 alkyleneoxy, amine, C1-C9 alkylamine, halogen (fluorine, chlorine, bromine, and iodine), and phenyl.]

[0009] Propylene random copolymer (A') The polypropylene resin composition contains a propylene random copolymer (A'). The propylene random copolymer (A') is a random copolymer of propylene and a monomer other than propylene, and contains monomer units derived from propylene and monomer units derived from a monomer other than propylene. The random copolymer preferably contains 0.01% by mass or more and 20% by mass or less of monomer units derived from a monomer other than propylene, based on the mass of the random copolymer.

[0010] Examples of the monomer other than propylene include ethylene and α-olefins having 4 to 12 carbon atoms. Among these, at least one selected from the group consisting of ethylene and α-olefins having 4 to 10 carbon atoms is preferred, at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene is more preferred, and at least one selected from the group consisting of ethylene and 1-butene is even more preferred.

[0011] Examples of the random copolymer include a propylene-ethylene random copolymer, a propylene-1-butene random copolymer, a propylene-1-hexene random copolymer, a propylene-1-octene random copolymer, a propylene-ethylene-1-butene random copolymer, a propylene-ethylene-1-hexene random copolymer, and a propylene-ethylene-1-octene random copolymer.

[0012] The propylene random copolymer (A') has a melting peak temperature in a melting curve measured using a differential scanning calorimeter of less than 160°C, preferably 155°C or lower, more preferably 150°C or lower.

[0013] From the viewpoint of fluidity of the resin composition when melted, the intrinsic viscosity ([η]) of the random copolymer is preferably 0.10 to 2.00 dL / g, more preferably 0.50 to 1.50 dL / g, and even more preferably 0.70 to 1.40 dL / g.

[0014] The content of the propylene random copolymer (A') in the polypropylene resin composition is 15% by weight or more and 65% by weight or less, and preferably 18% by weight or more and 60% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0015] Propylene polymer (A) The polypropylene resin composition contains a propylene polymer (A) having a melting peak temperature of 160° C. or higher in a melting curve measured using a differential scanning calorimeter. The melting peak temperature of the propylene polymer (A) is 160°C or higher. The content of the propylene polymer (A) in the polypropylene resin composition is 3% by weight or more and 40% by weight or less, and preferably 4% by weight or more and 38% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight. The propylene polymer (A) may be a propylene homopolymer, a heterophasic propylene polymer material, or both.

[0016] (propylene homopolymer) When component A contains a propylene homopolymer, the intrinsic viscosity ([η]) of the propylene homopolymer is preferably 0.10 to 2.00 dL / g, more preferably 0.50 to 1.50 dL / g, and even more preferably 0.70 to 1.40 dL / g, from the viewpoints of the fluidity of the resin composition when melted and the toughness of the molded product.

[0017] 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.

[0018] 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).

[0019] The propylene homopolymer can be produced, for example, by polymerizing propylene using a polymerization catalyst.

[0020] Examples of the polymerization catalyst 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 modified catalysts obtained 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.).

[0021] As the polymerization catalyst, for example, catalysts described in JP-A Nos. 61-218606, 5-194685, 7-216017, 9-316147, 10-212319, and 2004-182981 may be used.

[0022] Furthermore, a polymer obtained by prepolymerizing propylene in the presence of the above polymerization catalyst can also be used as the polymerization catalyst.

[0023] Polymerization methods include, for example, 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 the medium.

[0024] The polymerization method may be, for example, a batch method, a continuous method, or a combination thereof. The polymerization method may be a multi-stage method in which a plurality of polymerization reactors are connected in series.

[0025] From the viewpoint of industrial and economical excellence, 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 is preferred.

[0026] Various conditions in the polymerization step (polymerization temperature, polymerization pressure, monomer concentration, catalyst input amount, polymerization time, etc.) may be appropriately determined depending on the molecular structure of the target polymer.

[0027] After the polymerization step, the polymer may be dried at a temperature equal to or lower than the melting point of the polymer, if necessary, to remove residual solvent contained in the polymer, ultralow molecular weight oligomers produced as by-products during production, etc. Examples of drying methods include those described in JP-A-55-75410 and JP-A-2565753.

[0028] ( Heterophasic propylene polymer material) The heterophasic propylene polymer material can be produced, for example, by carrying out a first polymerization step to form polymer (I) and a second polymerization step to form polymer (II). Examples of the polymerization catalyst, polymerization method, and polymerization system used in these polymerization steps are the same as those described above.

[0029] The polymer (I) may be, for example, a propylene homopolymer, or may contain monomer units derived from a monomer other than propylene. When the polymer (I) contains monomer units derived from a monomer other than propylene, the content of such units may be, for example, 0.01% by mass or more and less than 20% by mass based on the total mass of the polymer (I).

[0030] Examples of the monomer other than propylene include ethylene and α-olefins having 4 or more carbon atoms. Among them, at least one selected from the group consisting of ethylene and α-olefins having 4 to 10 carbon atoms is preferred, at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, and 1-octene is more preferred, and at least one selected from the group consisting of ethylene and 1-butene is even more preferred.

[0031] Examples of polymers 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.

[0032] From the viewpoint of dimensional stability of the molded article, the 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.

[0033] The content of polymer (I) is preferably 50 to 99 mass %, more preferably 60 to 90 mass %, based on the total mass of the heterophasic propylene polymerization material.

[0034] Polymer (II) preferably contains 20% by mass or more of monomer units derived from at least one α-olefin selected from the group consisting of ethylene and α-olefins having from 4 to 12 carbon atoms, and also contains monomer units derived from propylene.

[0035] In polymer (II), the content of monomer units derived from at least one α-olefin selected from the group consisting of ethylene and α-olefins having from 4 to 12 carbon atoms may be 25 to 60 mass %, or may be 30 to 60 mass %.

[0036] In polymer (II), the at least one α-olefin selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms is preferably at least one selected from the group consisting of ethylene and α-olefins having 4 to 10 carbon atoms, 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.

[0037] Examples of the 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. Among them, propylene-ethylene copolymer, propylene-1-butene copolymer, and propylene-ethylene-1-butene copolymer are preferred, and propylene-ethylene copolymer is more preferred.

[0038] The content of the polymer (II) is preferably from 1 to 50 mass %, more preferably from 10 to 40 mass %, based on the total mass of the heterophasic propylene polymerization material.

[0039] The content of the CXIS component in the heterophasic propylene polymerization material is preferably 50 to 99 mass %, more preferably 60 to 90 mass %, based on the total mass of the heterophasic propylene polymerization material. The content of the CXS component in the heterophasic propylene polymerization material is preferably 1 to 50 mass %, more preferably 10 to 40 mass %, based on the total mass of the heterophasic propylene polymerization material.

[0040] In this embodiment, the xylene-insoluble (CXIS) component in the heterophasic propylene polymerization material is considered to be mainly composed of polymer (I), and the xylene-soluble (CXS) component in the heterophasic propylene polymerization material is considered to be mainly composed of polymer (II).

[0041] Examples of heterophasic propylene polymer materials include (propylene)-(propylene-ethylene) polymer materials, (propylene)-(propylene-ethylene-1-butene) polymer materials, (propylene)-(propylene-ethylene-1-hexene) polymer materials, (propylene)-(propylene-ethylene-1-octene) polymer materials, (propylene)-(propylene-1-butene) polymer materials, (propylene)-(propylene-1-hexene) polymer materials, (propylene)-(propylene-1-octene) polymer materials, and (propylene)-(propylene-1-decene) polymer materials. materials, (propylene-ethylene)-(propylene-ethylene) polymerization materials, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerization materials, (propylene-ethylene)-(propylene-ethylene-1-hexene) polymerization materials, (propylene-ethylene)-(propylene-ethylene-1-octene) polymerization materials, (propylene-ethylene)-(propylene-ethylene-1-decene) polymerization materials, (propylene-ethylene)-(propylene-1-butene) polymerization materials, (propylene-ethylene)-(propylene-1-hexene) polymerization materials, (propylene-ethylene) (propylene)-(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.

[0042] 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.

[0043] As the heterophasic propylene polymeric material, 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 is preferred, and a (propylene)-(propylene-ethylene) polymeric material is more preferred.

[0044] The intrinsic viscosity ([η]I) of the polymer (I) is preferably from 0.10 to 2.00 dL / g, more preferably from 0.50 to 1.50 dL / g, and even more preferably from 0.70 to 1.40 dL / g.

[0045] The intrinsic viscosity ([η]II) of the polymer (II) is preferably from 1.00 to 10.00 dL / g, more preferably from 2.00 to 10.00 dL / g, and even more preferably from 2.00 to 8.00 dL / g.

[0046] Furthermore, 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 to 20, more preferably 1 to 10, and even more preferably 1 to 9.

[0047] The intrinsic viscosity number ([η]I) of the polymer (I) can be measured, for example, by forming the polymer (I) and then measuring the intrinsic viscosity number of the polymer.

[0048] 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 contents of polymer (II) and polymer (I).

[0049] [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: Ratio of the mass of polymer (I) to the total mass of the heterophasic propylene polymer material (mass of polymer (I) / mass of heterophasic propylene polymer material) XII: Ratio of the mass of polymer (II) to the total mass of heterophasic propylene polymer material (mass of polymer (II) / mass of heterophasic propylene polymer material)

[0050] Here, XI and XII can be determined from the material balance during polymerization.

[0051] Incidentally, XII may be calculated by measuring the heat of fusion of the polymer (I) and the heat of fusion of the heterophasic propylene polymer material and using the following formula. 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)

[0052] The intrinsic viscosity number ([η]CXIS) of the CXIS component is preferably 0.10 to 2.00 dL / g, more preferably 0.50 to 1.50 dL / g, and even more preferably 0.70 to 1.40 dL / g.

[0053] The intrinsic viscosity number ([η]CXS) of the CXS component is preferably 1.00 to 10.00 dL / g, more preferably 2.00 to 10.00 dL / g, and even more preferably 2.00 to 8.00 dL / g.

[0054] 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 to 20, more preferably 1 to 10, and even more preferably 1 to 9.

[0055] The isotactic pentad fraction (also referred to as the [mmmm] fraction) of the polymer (I) is preferably 0.950 or more, more preferably 0.970 or more, from the viewpoint of rigidity and dimensional stability of a molded article made from the resin composition. The isotactic pentad fraction of the polymer (I) may be, for example, 1.000 or less.

[0056] The isotactic pentad fraction refers to the isotactic fraction in pentad units. In other words, the isotactic pentad fraction indicates the content of a structure 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 a chain of propylene-derived monomer units.

[0057] 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: 13The assignment of absorption peaks obtained by C-spectrometry is based on the description in Macromolecules, 8, 687 (1975).

[0058] The melt flow rate of the polymer (I) at a temperature of 230° C. and a load of 2.16 kgf is preferably 5 g / 10 min or more, more preferably 20 g / 10 min to 300 g / 10 min, from the viewpoint of molding processability of the resin composition.

[0059] From the viewpoint of molding processability of the resin composition, the melt flow rate of component A at a temperature of 230° C. and a load of 2.16 kgf is preferably 5 g / 10 min or more, and more preferably 20 g / 10 min or more.

[0060] In this specification, the melt flow rate refers to a value measured in accordance with JIS K 6758. The melt flow rate may also be referred to as MFR hereinafter.

[0061] Ethylene-α-olefin copolymer (B) The polypropylene resin composition contains an ethylene-α-olefin copolymer (B). In component B, the total content of the monomer units derived from ethylene contained in component B and the content of the monomer units derived from an α-olefin having 4 or more carbon atoms may be 100% by mass, with the total mass of component B being 100% by mass.

[0062] Examples of α-olefins having 4 or more carbon atoms include α-olefins having 4 to 12 carbon atoms. Examples of α-olefins having 4 to 12 carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene. Of these, 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.

[0063] Examples of component B 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.

[0064] In Component B, the content of monomer units derived from α-olefins having 4 or more carbon atoms is preferably 1 to 49 mass%, more preferably 5 to 49 mass%, and even more preferably 24 to 49 mass%, based on the total mass of Component B.

[0065] The melt flow rate of component B at a temperature of 230° C. and a load of 2.16 kgf is preferably 0.1 g / 10 min to 80 g / 10 min.

[0066] The density of component B is 0.850 to 0.890 g / cm from the viewpoint of impact resistance of the molded product. 3 It is preferable that the density is 0.850 to 0.880 g / cm 3 More preferably, it is 0.855 to 0.870 g / cm 3 It is more preferable that:

[0067] Component B can be produced by polymerizing ethylene and an α-olefin having 4 or more carbon atoms using a polymerization catalyst.

[0068] Examples of the polymerization catalyst include homogeneous catalysts such as metallocene catalysts, and Ziegler-Natta catalysts.

[0069] Examples of homogeneous catalysts include catalysts composed of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane; catalysts 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 modified catalysts in which 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.) is supported on inorganic particles (silica, clay minerals, etc.).

[0070] An example of a Ziegler-Natta catalyst is a catalyst that combines a titanium-containing solid transition metal component with an organometallic component.

[0071] Commercially available products may be used as component B. Examples of commercially available component B 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.

[0072] The content of the ethylene-α-olefin copolymer (B) in the polypropylene resin composition is 10% by weight or more and 35% by weight or less, and preferably 15% by weight or more and 33% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0073] Glass fiber (C) The polypropylene resin composition contains glass fibers (C). The glass fiber can be used without any particular limitation, and examples of the type of glass used for the fiber include E glass, C glass, A glass, and S glass, among which E glass is preferred. The method for producing the glass fiber is not particularly limited, and it can be produced by various known production methods. The polypropylene resin composition may contain only one type of glass fiber, or may contain two or more types of glass fiber.

[0074] The glass fiber length is preferably 2 to 20 mm, more preferably 3 to 10 mm. From the viewpoint of the rigidity of the obtained molded article, the glass fiber length is preferably 2 mm or more. From the viewpoints of grain transferability, touch, and moldability (fluidity), the glass fiber length is preferably 20 mm or less. In this specification, the fiber length refers to the length of the glass fiber before melt-kneading when it is used as a raw material as it is in the case of a normal roving-shaped or strand-shaped fiber. However, in the case of a glass fiber-containing pellet obtained by aggregating and integrating a large number of continuous glass fibers through melt-extrusion processing as described below, the length of one side of the pellet (in the extrusion direction) is substantially the same as the length of the fiber in the pellet, so the length of one side of the pellet (in the extrusion direction) is taken as the length of the fiber. Here, "substantially" specifically means that, based on the total number of fibers in the fiber-containing pellets, 50% or more, preferably 90% or more, of the fibers have the same length as the length (extrusion direction) of the carbon fiber-containing pellets, and that the fibers are hardly broken during the preparation of the pellets. In this specification, the fiber length is measured using a microscope and calculated as the average length of 100 or more fibers. Specifically, the measurement is carried out by mixing glass fibers with surfactant-containing water, dropping and spreading the mixed water onto a thin glass plate, and then measuring the lengths of 100 or more glass fibers using a digital microscope (for example, Keyence VHX-900 model) and calculating the average value.

[0075] The fiber diameter of the glass fiber is preferably 3 to 25 μm, more preferably 6 to 20 μm. From the viewpoint of preventing breakage of the glass fiber during production and molding of the resin composition and its molded article, the fiber diameter is preferably 3 μm or more. From the viewpoint of rigidity of the obtained molded article, the fiber diameter is preferably 25 μm or less. The fiber diameter is determined by cutting the fiber perpendicular to the fiber length direction, measuring the diameter of the cross section by observing it under a microscope, and calculating the average diameter of 100 or more fibers.

[0076] The glass fiber may be either surface-treated or untreated. However, in order to improve dispersibility in polypropylene-based resins, it is preferable to use glass fiber that has been surface-treated with an organic silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a zirconate coupling agent, a silicone compound, a higher fatty acid, a fatty acid metal salt, a fatty acid ester, or the like.

[0077] The glass fibers may be subjected to a bundling (surface) treatment with a sizing agent, and examples of the sizing agent include epoxy-based sizing agents, aromatic urethane-based sizing agents, aliphatic urethane-based sizing agents, acrylic-based sizing agents, and maleic anhydride-modified polyolefin-based sizing agents. These sizing agents must be melted during melt-kneading with the polypropylene-based resin, and therefore are preferably those that melt at 200°C or less.

[0078] The glass fiber may be either surface-treated or untreated. However, in order to improve dispersibility in polypropylene-based resins, it is preferable to use glass fiber that has been surface-treated with an organic silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a zirconate coupling agent, a silicone compound, a higher fatty acid, a fatty acid metal salt, a fatty acid ester, or the like.

[0079] Examples of organic silane coupling agents used in surface treatment include vinyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, and 3-acryloxypropyltrimethoxysilane. Examples of titanate coupling agents include isopropyl triisostearoyl titanate, isopropyl tris(dioctylpyrophosphate)titanate, and isopropyl tri(N-aminoethyl)titanate. Examples of aluminate coupling agents include acetoalkoxyaluminum diisopropylate. Examples of zirconate coupling agents include tetra(2,2-diallyloxymethyl)butyl, di(tridecyl)phosphitozirconate, neopentyl(diallyl)oxy, and trineodecanoyl zirconate. Examples of silicone compounds include silicone oils and silicone resins.

[0080] Furthermore, examples of higher fatty acids used in surface treatment include oleic acid, capric acid, lauric acid, palmitic acid, stearic acid, montanic acid, caraic acid, linoleic acid, rosin acid, linolenic acid, undecanoic acid, and undecenoic acid. Examples of higher fatty acid metal salts include sodium salts, lithium salts, calcium salts, magnesium salts, zinc salts, and aluminum salts of fatty acids having 9 or more carbon atoms, such as stearic acid and montanic acid. Among these, calcium stearate, aluminum stearate, calcium montanate, and sodium montanate are preferred. Examples of fatty acid esters include polyhydric alcohol fatty acid esters such as glycerin fatty acid esters, alpha sulfone fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, polyethylene fatty acid esters, and sucrose fatty acid esters. The amount of the surface treatment agent used is not particularly limited, but is preferably 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, per 100 parts by weight of the glass fibers.

[0081] The glass fiber can also be used as so-called chopped strand glass fiber, which is obtained by cutting a fiber yarn to a desired length. Among these, from the viewpoint of low shrinkage, rigidity, impact strength, etc. of the resin composition and its molded article, it is preferable to use chopped strand glass fiber obtained by aligning strands of bundled glass fibers and cutting them to lengths of 2 mm to 20 mm.

[0082] A specific example of the glass fiber is T480H manufactured by Nippon Electric Glass Co., Ltd.

[0083] Furthermore, these glass fibers can be used as "glass fiber-containing pellets" by previously melt-extruding them with any amount of, for example, the components (A'), (A), and (B) to aggregate and integrate a large number of continuous glass fibers, which is preferred from the viewpoint of further enhancing the effects of improving the grain transferability, rigidity, etc. of the resin composition and its molded article. In the case of such glass fiber-containing pellets, as described above, the fiber length is the length of the glass fiber-containing pellets (extrusion direction), and is preferably 2 to 20 mm. The method for producing such glass fiber-containing pellets is not particularly limited, and known methods can be used.

[0084] In addition, in the glass fiber-containing pellets, the content of glass fibers is preferably 20% by weight to 70% by weight based on 100% by weight of the entire pellets. When glass fiber-containing pellets having a glass fiber content of less than 20% by weight are used in the present invention, the physical properties of the resin composition and its molded article, such as rigidity, may be reduced. On the other hand, when glass fiber pellets having a glass fiber content of more than 70% by weight are used, the grain transferability, tactile feel, moldability (fluidity), etc. may be reduced.

[0085] The content of the glass fiber (C) in the polypropylene resin composition is 20% by weight or more and 30% by weight or less, and preferably 20% by weight or more and 28% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0086] Acid-modified polyolefin (D) The polypropylene resin composition contains an acid-modified polyolefin (D). The acid-modified polyolefin (D) may be referred to as a "modified polyolefin resin" below. The modified polyolefin resin (acid-modified polyolefin (D)) is, for example, a resin obtained by modifying a polyolefin resin with an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative. The polyolefin resin used as the raw material for this modified polyolefin resin is a resin made of a homopolymer of one type of olefin or a copolymer of two or more types of olefins. In other words, the modified polyolefin resin is a resin produced by reacting a homopolymer of one type of olefin or a copolymer of two or more types of olefins with an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative, and is a resin having a partial structure derived from an unsaturated carboxylic acid or an unsaturated carboxylic acid derivative in the molecule. Specific examples of the modified polyolefin resins include the following (a) to (c). The polypropylene resin composition may contain one type of modified polyolefin resin or two or more types of modified polyolefin resins. (a): A modified polyolefin resin obtained by graft polymerizing an olefin homopolymer with an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative. (b): A modified polyolefin resin obtained by graft polymerizing an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative onto a copolymer obtained by copolymerizing two or more types of olefins. (c): A modified polyolefin resin obtained by graft polymerizing an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative onto a block copolymer obtained by homopolymerizing an olefin and then copolymerizing two or more types of olefins.

[0087] Examples of the unsaturated carboxylic acid include maleic acid, fumaric acid, itaconic acid, acrylic acid, and methacrylic acid. Furthermore, examples of the unsaturated carboxylic acid derivative include unsaturated carboxylic acid anhydrides, ester compounds, amide compounds, imide compounds, metal salts, etc. Specific examples of the unsaturated carboxylic acid derivative include maleic anhydride, itaconic anhydride, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-hydroxyethyl methacrylate, maleic acid monoethyl ester, maleic acid diethyl ester, fumaric acid monomethyl ester, fumaric acid dimethyl ester, acrylamide, methacrylamide, maleic acid monoamide, maleic acid diamide, fumaric acid monoamide, maleimide, N-butylmaleimide, and sodium methacrylate. As the unsaturated carboxylic acid, maleic acid and acrylic acid are preferred, and as the unsaturated carboxylic acid derivative, maleic anhydride and 2-hydroxyethyl methacrylate are preferred.

[0088] The modified polyolefin resin is preferably the above-mentioned (c), and more preferably a modified polyolefin resin obtained by graft polymerizing maleic anhydride onto a polyolefin resin containing units derived from ethylene and / or propylene as main structural units.

[0089] The content of the structural units derived from the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative contained in the modified polyolefin resin is preferably 0.1 to 20% by weight, more preferably 0.1 to 10% by weight, from the viewpoint of the rigidity and hardness of a molded article obtained from the resin composition (where the amount of the modified polyolefin resin is taken as 100% by weight). The content of the structural units derived from the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative is a value calculated by quantifying the absorption based on the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative using an infrared absorption spectrum or an NMR spectrum.

[0090] The graft efficiency of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative in the modified polyolefin resin is preferably 0.51 or more, from the viewpoint of the rigidity and impact strength of molded articles obtained from the resin composition. "Grafting efficiency of the modified polyolefin resin" means "the ratio of the amount of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative chemically bonded to the resin to the total amount of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative chemically bonded to the resin contained in the modified polyolefin resin and unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative not chemically bonded to the resin." The grafting efficiency in the graft polymerization of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative can be determined by the following steps (1) to (9). (1) Dissolve 1.0 g of modified polyolefin resin in 100 ml of xylene; (2) The xylene solution is added dropwise to 1,000 ml of methanol while stirring to reprecipitate the modified polyolefin resin; (3) recovering the reprecipitated modified polyolefin resin; (4) The recovered modified polyolefin resin is vacuum-dried at 80°C for 8 hours to obtain a purified modified polyolefin resin; (5) The purified modified polyolefin resin is heat-pressed to produce a film having a thickness of 100 μm; (6) Measure the infrared absorption spectrum of the film; (7) The absorption due to the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative is quantified from the infrared absorption spectrum, and the content (X1) of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative that has reacted with the polyolefin resin in the modified polyolefin resin is calculated. (8) Separately, the above procedures (5) and (6) are carried out on an unpurified modified polyolefin resin, and the content (X2) of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative in the unpurified modified polyolefin resin is calculated from the infrared absorption spectrum (X2 is the sum of the content (X1) of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative reacted with the polyolefin resin and the content of unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative not reacted with the polyolefin resin (i.e., free); The grafting efficiency is calculated from the formula (9): Grafting efficiency = X1 / X2.

[0091] From the viewpoints of mechanical strength and production stability, the MFR of the modified polyolefin resin is preferably 5 to 400 g / 10 min, more preferably 10 to 200 g / 10 min, and particularly preferably 20 to 150 g / 10 min. The MFR is a value measured at 230°C under a load of 2.16 kgf in accordance with JIS K7210.

[0092] The content of the acid-modified polyolefin (D) in the polypropylene resin composition is 0.1% by weight or more and 5% by weight or less, preferably 0.3% by weight or more and 5% by weight or less, and more preferably 0.5% by weight or more and 5% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0093] Nucleating Agent (E) The polypropylene resin composition contains a nucleating agent (E) represented by the following general formula (I). [ka] [In formula (I), M1 and M2 are the same or different and are at least one metal cation selected from alkali metals and alkaline earth metals (e.g., sodium, calcium, strontium, lithium, preferably sodium) and monobasic aluminum; and R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are the same or different and are each selected from the group consisting of hydrogen, C1-C9 alkyl (wherein any two alkyl groups may be joined together to form a hydrocarbon ring having up to 6 carbon atoms), hydroxy, C1-C9 alkoxy, C1-C9 alkyleneoxy, amine and C1-C9 alkylamine, halogen (fluorine, chlorine, bromine, and iodine), and phenyl.]

[0094] Examples of the alkyl group having 1 to 9 carbon atoms in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. Examples of the alkoxy group having 1 to 9 carbon atoms include a methoxy group, an ethoxy group, an n-propoxy group, and an isopropoxy group. Examples of the alkylamino group having 1 to 9 carbon atoms include a methylamino group, an ethylamino group, a dimethylamino group, and a diethylamino group. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkyleneoxy group having 1 to 9 carbon atoms include a group represented by the following general formula (II). R-(R'-O)n- (II) (In the formula, R represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R' represents an alkylene group having 2 or 3 carbon atoms, and n represents an integer of 2 to 4, with the proviso that the total number of carbon atoms in R and R' is 9 or less.)

[0095] The group represented by the general formula (II) above is preferably H-(CH2CHO)2-, H-(CH2CHO)3-, H-(CH2CHO)4-, CH3-(CH2CHO)2-, CH3-(CH2CHO)3-, CH3-(CH2CHO)4-, C2H5-(CH2CHO)2-, C2H5-(CH2CHO)3-, C3H7-(CH2CHO)2-, C3H7-(CH2CHO)3-, H-(CH(CH3)CHO)2-, H-(CH(CH3)CHO)3-, CH3-(CH(CH3)CHO)2- or C2H5-(CH(CH3)CHO)2-.

[0096] The nucleating agent (E) represented by the general formula (I) above is, for example, a compound represented by the following structural formula: In the example below, M1 and M2 are calcium, but sodium and other compounds are also included. [ka] [ka] [ka]

[0097] The nucleating agent (E) is preferably a compound in which R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and more preferably 1,2-cyclohexanedicarboxylate calcium salt represented by the following structural formula: [ka]

[0098] The nucleating agent (E) may be used in combination with a dispersant to improve dispersibility in the polypropylene resin composition. Examples of dispersants include fatty acids, alkyl esters of fatty acids, metal salts of fatty acids, alcohols having 10 to 30 carbon atoms, and polyhydric alcohols and esters thereof. The fatty acid is preferably a fatty acid having 10 to 24 carbon atoms, and the metal salt of the fatty acid is a metal salt of an alkali metal or alkaline earth metal. Examples of alkali metals include sodium, potassium, and lithium, and examples of alkaline earth metals include calcium, magnesium, and zinc. Examples of polyhydric alcohols and esters thereof include glycerin, ethylene glycol, propylene glycol, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, and esters thereof. Of these, metal salts of fatty acids are preferably used.

[0099] The nucleating agent (E) is preferably in the form of particles. The particle size of the nucleating agent (E) is an average particle size of 0.01 to 10 μm, preferably 0.01 to 5 μm, and more preferably 0.01 to 3 μm, as determined by a laser diffraction particle size distribution measurement method. The laser diffraction particle size distribution measurement method is a method of measuring particle size distribution using a laser diffraction particle size distribution measurement device (HELOS (trade name) manufactured by Sympatec).

[0100] Examples of methods for producing the nucleating agent (E) include those described in JP-A Nos. 2004-525227 and 2009-504842. 1,2-Cyclohexanedicarboxylate calcium salt is available from Milliken Chemical, Milliken Japan Co., Ltd. under the name Hyperform HPN-20E (registered trademark, 1,2-cyclohexanedicarboxylate calcium salt content: 66% by weight).

[0101] The most preferred nucleating agents (E) are: (Registered trademark) Hyperform HPN-68L (Milliken Japan Co., Ltd.) Chemical name of the main component: Disodium (1R,2R,3S,4S)-bicyclo[2.2.1]heptane-2,3-dicarboxylate (80% by weight) Chemical structure of the main component: [ka]

[0102] The content of the nucleating agent (E) in the polypropylene resin composition is 0.01 part by weight or more and 1 part by weight or less, and preferably 0.02% by weight or more and 0.5% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0103] Lubricant (F) The polypropylene resin composition may further contain a lubricant (F). The polypropylene resin composition may contain only one type of lubricant (F), or may contain two or more types of lubricants (F). Examples of the lubricant (F) include fatty acid amides. Examples of the fatty acid residue of the fatty acid amide include residues derived from saturated and unsaturated fatty acids having approximately 5 to 30 carbon atoms. The fatty acid amide is preferably a compound represented by RCONH2 (wherein R represents an alkyl or alkenyl group having 5 to 21 carbon atoms). Specific examples of the fatty acid amide include oleic acid amide, stearic acid amide, erucic acid amide, behenic acid amide, palmitic acid amide, myristic acid amide, lauric acid amide, caprylic acid amide, caproic acid amide, n-oleyl palmitamide, n-oleyl erucamide, and dimers thereof. These lubricants are preferred for improving the sticky feeling that is characteristic of using a random polypropylene polymer, and erucic acid amide is particularly preferred. The polypropylene resin composition may contain only one fatty acid amide, or two or more fatty acid amides. Examples of commercially available products include Diamid Y manufactured by Nippon Chemical Industry Co., Ltd., Armid HT-P manufactured by Lion Akzo Co., Ltd., Neutron manufactured by Nippon Fine Chemical Industry Co., Ltd., Diamid KN manufactured by Nippon Fine Chemical Industry Co., Ltd., and Neutron S manufactured by Nippon Fine Chemical Industry Co., Ltd.

[0104] The content of the lubricant (F) in the polypropylene resin composition is preferably 0.1% by weight or more and 1.0% by weight or less, where the total amount of the components (A'), (A), (B), (C) and (D) is 100% by weight.

[0105] Other additives The polypropylene resin composition may also contain known additives. Examples of additives include neutralizers, antioxidants, UV absorbers, light stabilizers, 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, light diffusing agents, inorganic fillers, and scratch resistance inhibitors. The polypropylene resin composition may contain only one of these additives or two or more of them. Among these, neutralizers, antioxidants, UV absorbers, light stabilizers, and colorants are preferred. A preferred polypropylene resin composition contains, in addition to the above components, at least one selected from the group consisting of organic peroxides, neutralizers, antioxidants, UV absorbers, light stabilizers, and colorants.

[0106] Examples of the neutralizing agent include metal salts of higher fatty acids (metal soaps), hydrotalcites, alkaline earth metal oxides or hydroxides, etc. The polypropylene resin composition may contain only one type of neutralizing agent or may contain two or more types.

[0107] The higher fatty acid constituting the metal salt of a higher fatty acid (metal soap) preferably has, for example, 10 to 30 carbon atoms, more preferably 12 to 18 carbon atoms. Preferred metal salts include, for example, calcium salt, sodium salt, magnesium salt, lithium salt, aluminum salt, and zinc salt, more preferably calcium salt or zinc salt. Calcium salt or zinc salt of stearic acid is preferred.

[0108] The hydrotalcites may be natural minerals or synthetic products, and their crystal structure, crystal particle size, water content, etc. may be appropriately determined. Furthermore, the hydrotalcites may be subjected to a surface treatment, if necessary.

[0109] Among the hydrotalcites, the hydrotalcite represented by the following formula is preferred. Mg Y Al2(OH) 2Y+4 CO₃ mH₂O (In the formula, Y is Y≧4, and m is a positive number.) Moreover, the following hydrotalcites are more preferred as hydrotalcites. Mg 4.5 Al2(OH) 13 CO₃ 3H₂O Mg 4.5 Al2(OH) 11 (CO3) 0.8 ·O 0.2 Mg4Al2(OH) 12 CO₃ 3H₂O Mg5Al2(OH) 14 CO₃ 4H₂O Mg6Al2(OH) 16 CO₃ 4H₂O Mg3ZnAl2(OH) 12 CO3·mH2O (m is 0 to 4)

[0110] The alkaline earth metal oxide or hydroxide is an oxide or hydroxide of a metal atom in Group 2 of the periodic table, and examples thereof include calcium oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, etc. Calcium hydroxide is preferred.

[0111] The amount of the neutralizing agent added is, for example, 0.001 to 0.5 parts by weight, preferably 0.005 to 0.2 parts by weight, and more preferably 0.01 to 0.2 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0112] Examples of the antioxidant include phenol-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, hydroxylamine-based antioxidants, and metal deactivators. Phenol-based antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants are preferred.

[0113] Examples of phenolic antioxidants include tetrakis[methylene-3(3',5'di-t-butyl-4-hydroxyphenyl)propionate]methane, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 3,9-bis[2-{3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1,1-dimethylethyl]-2,4,8,10-tetrakis Examples include suspiro[5·5]undecane, triethylene glycol-N-bis-3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate, 1,6-hexanediol bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 2,2-thiobis-diethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], and tocopherols.

[0114] From the viewpoint of color stability of the polypropylene resin composition, 3,9-bis[2-{3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5·5]undecane is preferred.

[0115] The amount of the phenolic antioxidant to be added is 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0116] Examples of phosphorus-based antioxidants that can be used from the viewpoint of processing stability of polypropylene-based resin compositions include tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, and 2,4,8,10-tetra-t-butyl-6-[3-(3-methyl-4-hydroxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine.

[0117] The amount of the phosphorus-based antioxidant to be added is 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0118] Examples of sulfur-based antioxidants that can be used from the viewpoint of heat aging resistance of polypropylene resin compositions include dimyristyl 3,3'-thiodipropionate, neopentanetetrayltetrakis(3-laurylthiopropionate), and bis[2-methyl-4-(3-n-alkyl(C12-C14)thiopropionyloxy)-5-t-butylphenyl]sulfide, where C12 represents 12 carbon atoms and C14 represents 14 carbon atoms.

[0119] The amount of the sulfur-based antioxidant to be added is 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0120] Examples of ultraviolet absorbers include phenyl salicylate, 4-t-butylphenyl salicylate, 2,4-di-t-butylphenyl 3',5'-di-t-butyl-4'-hydroxybenzoate, myristyl 3,5-di-t-butyl-4-hydroxybenzoate, lauryl 3,5-di-t-butyl-4-hydroxybenzoate, palmityl 3,5-di-t-butyl-4-hydroxybenzoate, stearyl 3,5-di-t-butyl-4-hydroxybenzoate, behenyl 3,5-di-t-butyl-4-hydroxybenzoate, montanyl 3,5-di-t-butyl-4-hydroxybenzoate, and 4-t-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2,2',4,4'-tetrahydroxybenzophenone, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(3',5'-di-t-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-t-butyl-2'-hydroxyphenyl)benzotriazole, Examples thereof include 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(3-t-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole, 2-(3'-sec-butyl-2'-hydroxy-5'-t-butylphenyl)benzotriazole, 2-(2'-hydroxy-4'-octyloxyphenyl)benzotriazole, 2-(3',5'-di-t-amyl-2'-hydroxyphenyl)benzotriazole, and 2-[2'-hydroxy-3',5'-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole.

[0121] Preferred are 2,4-di-t-butylphenyl 3',5'-di-t-butyl-4'-hydroxybenzoate, lauryl 3,5-di-t-butyl-4-hydroxybenzoate, palmityl 3,5-di-t-butyl-4-hydroxybenzoate, stearyl 3,5-di-t-butyl-4-hydroxybenzoate, and behenyl 3,5-di-t-butyl-4-hydroxybenzoate, because these compounds provide resin compositions with excellent color.

[0122] The amount of the ultraviolet absorber to be added is typically 0.01 to 2 parts by weight per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C) and (D). The amount is preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight.

[0123] As the light stabilizer, either a low molecular weight light stabilizer or an oligomer type high molecular weight light stabilizer may be used, for example, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, a mixture containing bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate; Bis(1,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butyl malonate, Reaction products of decanedioic acid bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) ester with 1,1-dimethylethyl hydroperoxide and octane, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, A mixture of 2,2,6,6-tetramethyl-4-piperidinol and higher fatty acid esters, tetrakis(2,2,6,6-tetra-methyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, tetrakis(1,2,2,6,6-penta-methyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, Polycondensation product of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol, poly[{(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl){(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino}}, Polycondensation product of dibutylamine, 1,3,5-triazine, N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine) and N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine, N,N',N'',N'''-tetrakis-(4,6bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)-triazin-2-yl)-4,7-diazadecane-1,10-diamine, Examples include mixed {1,2,2,6,6-pentamethyl-4-piperidyl / β,β,β',β'-tetramethyl-3,9-[2,4,8,10-tetraoxaspiro(5,5)undecane]dimethyl}-1,2,3,4 butanetetracarboxylate.

[0124] Preferably, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, a reaction product of decanedioic acid bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) ester, 1,1-dimethylethyl hydroperoxide, and octane, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, and the like are used because they provide a resin composition excellent in light stability. reaction products of decanedioic acid bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) ester with 1,1-dimethylethyl hydroperoxide and octane; polycondensation products of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol; and poly[{(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl){(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino}}.

[0125] The amount of the light stabilizer added is typically 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0126] Examples of colorants include inorganic pigments and organic pigments. Examples of inorganic pigments include iron oxide, titanium oxide, zinc oxide, red iron oxide, cadmium red, cadmium yellow, ultramarine, cobalt blue, titanium yellow, white lead, red lead, lead yellow, and iron blue. Examples of organic pigments include carbon black, quinacridone, polyazo yellow, anthraquinone yellow, polyazo red, azo lake yellow, perylene, phthalocyanine green, phthalocyanine blue, and isoindolinone yellow. The polypropylene resin composition may contain only one type of colorant, or two or more types. Furthermore, the polypropylene resin composition may contain a pigment and a pigment dispersant for the purpose of dispersing the pigment in the resin composition. The colorant (pigment) can be added as a masterbatch. The amount of the colorant to be added is, for example, 0.001 to 10 parts by weight, preferably 0.005 to 8 parts by weight, and more preferably 0.01 to 7 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D). An example of the organic peroxide is bis(tert-butylperoxyisopropyl)benzene, which can be added as an organic peroxide masterbatch. do. The amount of the organic peroxide to be added is, for example, 0.001 to 5 parts by weight, preferably 0.005 to 1 part by weight, and more preferably 0.01 to 0.5 parts by weight, per 100 parts by weight of the resin composition containing the components (A'), (A), (B), (C), and (D).

[0127] The polypropylene resin composition may contain resins and rubbers other than the components (A'), (A), (B), (C) and (D). For example, polystyrenes (e.g., polystyrene, poly(p-methylstyrene), poly(α-methylstyrene), AS (acrylonitrile / styrene copolymer) resin), ABS (acrylonitrile / butadiene / styrene copolymer) resin, AAS (special acrylic rubber / acrylonitrile / styrene copolymer) resin, ACS (acrylonitrile / chlorinated polyethylene / styrene copolymer) resin, polychloroprene, chlorinated rubber, polyvinyl chloride, polyvinylidene chloride, acrylic resin, ethylene / vinyl alcohol copolymer resin, fluororesin, polyacetal, grafted polyphenylene ether resin, and and thermoplastic resins such as polyphenylene sulfide resin, polyurethane, polyamide, polyester resin (e.g., polyethylene terephthalate, polybutylene terephthalate), polycarbonate, polysulfone, polyether ether ketone, polyether sulfone, and aromatic polyester resin; epoxy resin, diallyl phthalate prepolymer, silicone resin, silicone rubber, polybutadiene, 1,2-polybutadiene, polyisoprene, styrene / butadiene copolymer, butadiene / acrylonitrile copolymer, epichlorohydrin rubber, acrylic rubber, and natural rubber.

[0128] The polypropylene resin composition may also contain a polymer produced by polymerizing a plant-derived monomer extracted from a biomaterial, such as PLA resin (polylactic acid).

[0129] The polypropylene resin composition and the additives, other resins, rubbers, etc. added thereto can be melt-mixed by a known method at 180°C or higher, preferably 180 to 300°C, more preferably 180 to 250°C, and for melt-kneading, for example, a melt extruder or a Banbury mixer can be used.

[0130] Examples of methods for blending the nucleating agent (E) with the components (A'), (A), (B), (C) and (D) include the following methods (1) to (3). (1) A method of mixing a required amount of a nucleating agent (E) with a mixture of required amounts of the components (A'), (A), (B), (C), and (D), etc.; (2) A method comprising a step (step (1)) of mixing 100 parts by weight of any of the components (A'), (A), and (B) or 100 parts by weight of a mixture of the components (A'), (A), (B), (C), and (D), etc., with 1 to 100 parts by weight, preferably 1 to 50 parts by weight, more preferably 5 to 30 parts by weight of a nucleating agent (E) to produce a masterbatch, and a step (step (2)) of mixing the masterbatch with a mixture containing the components (A'), (A), (B), (C), and (D), etc., (3) A method comprising the steps of: (1) mixing 100 parts by weight of the additive (at least one kind) with 10 to 900 parts by weight, preferably 10 to 500 parts by weight, more preferably 20 to 200 parts by weight of a nucleating agent (E) to obtain a mixture (step (3)); (4) solidifying the mixture into granules to obtain a granular product; and (5) mixing a predetermined amount of the granular product with a mixture of required amounts of the components (A'), (A), (B), (C), and (D), etc. Among these, method (2) using a masterbatch can produce a polypropylene resin composition with an excellent balance between tensile strength and impact resistance. The above-mentioned "required amount" means an amount corresponding to the amount specified in the present invention, and the above-mentioned "predetermined amount" means an amount such that the amount of the component in the resulting final mixture satisfies the amount specified in the present invention.

[0131] Examples of melt-kneading devices used in the production method of a polypropylene-based resin composition include known melt-kneading devices, such as a single-screw extruder, a twin-screw co-rotating extruder (ZSK (registered trademark) manufactured by Wernw Pfleideren, TEM (registered trademark) manufactured by Toshiba Machine Co., Ltd., TEX (registered trademark) manufactured by The Japan Steel Works, Ltd., KZW (registered trademark) manufactured by Technovel Co., Ltd.), and a twin-screw counter-rotating extruder (CMP (registered trademark) and TEX (registered trademark) manufactured by The Japan Steel Works, Ltd., FCM (registered trademark), NCM (registered trademark), and LCM (registered trademark) manufactured by Kobe Steel, Ltd.).

[0132] The polypropylene resin composition may be in the form of, for example, a strand, a sheet, a plate, or pellets obtained by cutting a strand to an appropriate length. In order to mold the polypropylene resin composition, the preferred form is a pellet having a length of 1 to 50 mm, from the viewpoint of production stability of the molded article obtained.

[0133] The molded article is a molded article obtained by molding the polypropylene resin composition by various molding methods, and the shape, size, etc. of the molded article may be determined appropriately.

[0134] Examples of methods for producing the molded article include injection molding, press molding, vacuum molding, foam molding, extrusion molding, and the like, which are commonly used industrially. In addition, depending on the purpose, methods such as a molding method in which the polypropylene-based resin composition is laminated with the same type of resin or with another resin, and a co-extrusion molding method may also be used.

[0135] The molded article is preferably an injection-molded article produced by injection molding, such as 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.

[0136] Examples of uses of the molded body include automotive materials, home appliance materials, monitor materials, office equipment materials, medical materials, drainage pans, toiletry materials, bottles, containers, sheets, films, and building materials. Preferred uses are automotive materials and home appliance materials, and more preferred are automotive materials.

[0137] Automotive materials include, for example, interior parts such as door trims, pillars, instrument panels, consoles, rocker panels, armrests, door panels, and spare tire covers, as well as exterior parts such as bumpers, spoilers, fenders, and side steps, as well as other parts such as air intake ducts, coolant reserve tanks, fender liners, fans, and under-deflectors, as well as integrally molded parts such as front-end panels.

[0138] Examples of home appliance materials include materials for washing machines (outer tubs, inner tubs, lids, pulsators, balancers, etc.), materials for dryers, materials for vacuum cleaners, materials for rice cookers, materials for pots, materials for warmers, materials for dishwashers, and materials for air purifiers. [Example]

[0139] The present invention will be described in more detail below with reference to examples and comparative examples, but the technical scope of the present invention is not limited to these examples in any sense.

[0140] (1') Component (A') (propylene random copolymer) Component (A'-1) Propylene-ethylene random copolymer MFR (measured at 230°C and 2.16 kgf load): 28 g / 10 min Ethylene content: 4% by weight Melting point: 142°C

[0141] Component (A'-2) Propylene-ethylene random copolymer MFR (measured at 230°C and 2.16 kgf load): 9 g / 10 min Ethylene content: 4% by weight Melting point: 142°C

[0142] Component (A'-3) Propylene-ethylene random copolymer MFR (measured at 230°C and 2.16 kgf load): 18 g / 10 min Ethylene content: 4.6% by weight Melting point: 145℃

[0143] (1) Component (A) (propylene polymer) Component (A-1) Propylene-(propylene-ethylene) polymer material (heterophasic propylene polymer material) MFR (measured at 230°C and 2.16 kgf load): 138 g / 10 min Intrinsic viscosity number ([η]I) of propylene homopolymer component: 0.78 dl / g Propylene-ethylene copolymer component content: 10.0% by weight Ethylene content of propylene-ethylene copolymer component: 31% by weight Intrinsic viscosity number ([η]II) of propylene-ethylene copolymer component: 5.1 dl / g Melting point (peak melting temperature): 162°C Component (A-1) was produced by polymerizing a propylene homopolymer in a first polymerization step and polymerizing a propylene-ethylene copolymer in a second polymerization step in the presence of a polymerization catalyst obtained by the method described in Example 1 of JP-A-2004-182981.

[0144] Component (A-2) Propylene homopolymer MFR (measured at 230°C and 2.16 kgf load): 35 g / 10 min Melting point (peak melting temperature): 160℃

[0145] (2) Component (B) (ethylene-α-olefin copolymer) (B-1) Ethylene-octene random copolymer Product name: ENGAGE EG8200 (manufactured by Dow Chemical Japan Co., Ltd.) Density: 0.870(g / cm 3 ) MFR (230℃, 21.18N load): 5g / 10min

[0146] (B-2) Ethylene-butene random copolymer Product name: TAFMER DF73508 (Mitsui Chemicals, Inc.) Density: 0.870(g / cm 3 ) MFR (190°C, load 2.16 kg): 35 g / 10 min

[0147] (B-3) Ethylene-butene random copolymer Product name: ENGAGE EG7387 (manufactured by Dow Chemical Japan Co., Ltd.) Density: 0.872(g / cm 3 ) MFR (230℃, 21.18N load): 0.5g / 10min

[0148] (3) Component (C) (glass fiber) Glass fiber (chopped strands), Product name: TP480 (Nippon Electric Glass Co., Ltd.)

[0149] (4) Component (D) (acid-modified polyolefin) Maleic anhydride modified PP Product name: MPA101 (Sumitomo Chemical Co., Ltd.)

[0150] (5) Component (E) (Nucleating Agent (E-1)) Mixture containing disodium (1R,2R,3S,4S)-bicyclo[2.2.1]heptane-2,3-dicarboxylate as the main component (main component: 80% by weight) Product name: Hyperform HPN-68L (Milliken Japan Co., Ltd.)

[0151] Nucleating agents (not included in this invention): Aluminum hydroxy-di(p-tert-butylbenzoate) Product name: AL-PTBBA (Kyodo Pharmaceutical Co., Ltd.)

[0152] (6) Component (F) (lubricant) Product name: Neutron-S (manufactured by Nippon Fine Chemical Co., Ltd.) Chemical Name: Erucic acid amide

[0153] (7) Organic peroxide masterbatch (G) An organic peroxide masterbatch containing 8% by mass of bis(tert-butylperoxyisopropyl)benzene and 92% by mass of polypropylene.

[0154] (8) Pigment masterbatch (H) Carbon black content (51%)

[0155] The physical properties were measured according to the test methods shown below. (1) Melt flow rate (MFR, unit: g / 10 min) Measurement was performed under a load of 2.16 kg according to the method specified in JIS K 6758. The MFRs of components (A) and (A') and the polypropylene resin composition were measured at a temperature of 230°C, and the MFR of component (B) was measured at a temperature of 190°C.

[0156] (2) 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. 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).

[0157] (3) Measurement and calculation of the ratio of propylene homopolymer component and propylene-ethylene random copolymer component, and the intrinsic viscosity number ([η]I, [η]II) The intrinsic viscosity ([η]II) of the propylene-ethylene random copolymer component polymerized in the latter step was calculated from the intrinsic viscosity ([η]I) of the propylene homopolymer component obtained in the former polymerization step, the intrinsic viscosity ([η]Total) of the final polymer (total of the propylene homopolymer component and the propylene-ethylene random copolymer component) after the latter polymerization step measured by the above-mentioned method, and the content (weight ratio) of the propylene-ethylene random copolymer component contained in the final polymer using the following formula. [η]II=([η]Total-[η]I×XI) / XII [η]Total: Intrinsic viscosity (dl / g) of the final polymer after the second polymerization step [η]I: Intrinsic viscosity (dl / g) of the polymer powder extracted from the polymerization vessel after the first polymerization step XI: Weight ratio of components polymerized in the previous step XII: Weight ratio of components polymerized in subsequent steps

[0158] Here, XI and XII can be determined from the material balance during polymerization.

[0159] 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)

[0160] (4) Ethylene content in propylene-ethylene random copolymer The ethylene content ((C2)II) of the ethylene-α-olefin copolymer in the propylene polymer composition was determined by measuring the ethylene content ((C2')Total) of the entire propylene polymer composition by infrared absorption spectroscopy and calculating using the following formula: (C2')II=(C2')Total / XII (C2') Total: Ethylene content (mass%) of the entire propylene polymer composition (C2') II: Ethylene content (mass%) of ethylene-α-olefin copolymer

[0161] (5) Charpy impact test (unit: kJ / m 2 ) Injection molding was carried out using an M70 injection molding machine (clamping force 70 tons, cylinder diameter 32 mm) manufactured by Meiki Seisakusho Co., Ltd., under conditions of a molding temperature of 197°C and a mold cooling temperature of 38°C. Mold cavity shape: ISO mold Type A test specimens were prepared, and the test specimens were machined to 10 mm (width) x 80 mm (length) x 4 mm (thickness) with a notch, and measured at a temperature of 23°C in accordance with JIS K7111.

[0162] (7) Scratch resistance: Plane scratches (visual inspection) Using a Sumitomo Heavy Industries SE180D injection molding machine, injection molding was performed under conditions of a molding temperature of 220 ° C and a mold cooling temperature of 50 ° C., and rectangular parallelepiped test pieces measuring 400 mm in length, 100 mm in width, and 3 mm in thickness (having a 400 mm x 100 mm surface (textured surface) with a textured pattern and a 400 mm x 100 mm mirror back surface (mirror surface) were produced. Using a Taber scratch tester manufactured by Toyo Seiki Seisakusho, a planer blade was used with a load of 100 g to scratch the textured surface of the test piece, and the test piece was visually evaluated. Whitening of the scratches was evaluated as ×, and non-whitening was evaluated as ◯. The less whitening, the better the scratch resistance.

[0163] (8) Crystallization time (unit: seconds) Measurements were performed using a Diamond DSC (differential scanning calorimeter) manufactured by PerkinElmer Japan Co., Ltd. Specifically, pellets of the polypropylene resin composition were formed into a film (100 μm) using a compression molding machine to prepare a measurement sample. Approximately 10 mg of the prepared sample was placed in the DSC, heated to 220°C, and left at 220°C for 5 minutes to completely dissolve the sample. The sample was then rapidly cooled to 125°C at a rate of 300°C / min and maintained at that temperature until the end of the calorimetry curve. The crystallization time was determined as the time (seconds) required to reach the maximum value (peak top) of the obtained calorimetry curve. The shorter the required time, the shorter the time to crystallization. The shorter this crystallization time, the shorter the cooling time during molding and the better the molding processability.

[0164] (8) Warpage (unit: mm) Using a Sumitomo Heavy Industries, Ltd. SE130DU injection molding machine, injection molding was performed under conditions of a molding temperature of 220°C and a mold cooling temperature of 40°C to produce disc test pieces with a diameter of 200 mm and a thickness of 1 mm. The test pieces were held so that their edges did not touch the ground, and the height difference between the lowest and highest values ​​at the edges of the test pieces was measured. The smaller this height difference, the less warpage there was, which was considered to be better.

[0165] (9) Melting point (peak melting temperature) (unit: °C) Measurements were performed using a Diamond DSC (differential scanning calorimeter) manufactured by PerkinElmer Japan Co., Ltd. Specifically, pellets of the polypropylene resin composition were formed into a film (100 μm) using a compression molding machine to prepare a measurement sample. Approximately 10 mg of the prepared sample was placed in the DSC, heated to 230°C, and left at 230°C for 5 minutes to completely dissolve the sample. Thereafter, the sample was cooled to 40°C at a rate of 5°C / min and left at 40°C for 5 minutes. Thereafter, the sample was heated to 230°C at a rate of 5°C / min, and the temperature at which the minimum value of the calorie curve during heating was obtained as the melting point.

[0166] Example 1 [Production of polypropylene resin composition] 24 parts by weight of component (A'-1), 24 parts by weight of component (A-1), 25 parts by weight of component (B-1), 25 parts by weight of component (C), 2 parts by weight of component (D), 0.05 parts by weight of component (E), 0.4 parts by weight of component (F), 0.6 parts by weight of component (G), and 3 parts by weight of component (H) were uniformly premixed, and then melt-kneaded in a twin-screw kneading extruder at an extrusion rate of 50 kg / hr, 230°C, and a screw rotation speed of 200 rpm to produce a polypropylene-based resin composition. The physical properties of the resulting polypropylene-based resin composition are shown in Table 1 below.

[0167] [Examples 2 to 4 and Comparative Examples 1 to 5] The amounts of each component were changed as shown in Table 1 to produce polypropylene resin compositions. The physical properties of the resulting polypropylene resin composition are shown in Table 1 below.

[0168] [Table 1]

[0169] Table 1 shows that the polypropylene resin compositions of Comparative Examples 1 to 5 have long crystallization times, i.e., long cooling times during molding, and are therefore poor in molding processability (molded articles cannot be obtained efficiently in a short molding cycle). [Industrial Applicability]

[0170] The polypropylene resin composition of the present invention has excellent properties, such as the ability to efficiently (in a short molding cycle) produce molded articles with excellent scratch resistance (i.e., achieving both excellent scratch resistance and an efficient molding cycle), and is therefore particularly preferably used as an injection molding material, and is suitably used for various automobile interior and exterior parts such as instrument panels, glove boxes, trims, housings, pillars, bumpers, fenders, and back doors, as well as various parts for home appliances, various housing equipment parts, various industrial parts, and various building material parts, and has high applicability in various industrial fields such as the transportation machinery industry, the electrical and electronics industry, and the building and construction industry.

Claims

1. The propylene random copolymer (A') is 15% by weight or more and 65% by weight or less, a content of a propylene polymer (A) having a melting peak temperature of 160°C or higher in a melting curve measured using a differential scanning calorimeter of 3% by weight or more and 40% by weight or less; The ethylene-α-olefin copolymer (B) is 10% by weight or more and 35% by weight or less, The glass fiber (C) is 20% by weight or more and 30% by weight or less, For 100 parts by weight of a composition containing 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D), A polypropylene resin composition comprising 0.01 part by weight or more and 1 part by weight or less of nucleating agent (E) represented by at least one selected from the group consisting of the following structural formulas (wherein the total amount of (A'), (A), (B), (C), and (D) is taken as 100% by weight), 【Chemical 1】 the propylene random copolymer (A') is at least one selected from the group consisting of propylene-ethylene random copolymers, propylene-1-butene random copolymers, propylene-1-hexene random copolymers, propylene-1-octene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene-1-hexene random copolymers, and propylene-ethylene-1-octene random copolymers; the propylene polymer (A) is at least one selected from the group consisting of a propylene homopolymer and a heterophasic propylene polymerization material, and the heterophasic propylene polymerization material is produced by forming a propylene homopolymer in a first polymerization step, and then forming at least one copolymer selected from the group consisting of a propylene-ethylene copolymer, a propylene-ethylene-1-butene copolymer, a propylene-ethylene-1-hexene copolymer, a propylene-ethylene-1-octene copolymer, a propylene-ethylene-1-decene copolymer, a propylene-1-butene copolymer, a propylene-1-hexene copolymer, a propylene-1-octene copolymer, and a propylene-1-decene copolymer in a second polymerization step; A polypropylene-based resin composition, wherein the α-olefin in the ethylene-α-olefin copolymer (B) is an α-olefin having 4 to 12 carbon atoms.

2. 2. The polypropylene resin composition according to claim 1, which has a crystallization temperature of 120°C or higher as measured by differential scanning calorimetry (DSC).

3. The polypropylene resin composition according to claim 1 or 2, further comprising a lubricant (F).

4. The polypropylene resin composition according to claim 3, wherein the lubricant (F) comprises a fatty acid amide.

5. 5. The polypropylene resin composition according to claim 3, wherein the content of the lubricant (F) is 0.1% by weight or more and 1.0% by weight or less (where the total amount of (A'), (A), (B), (C) and (D) is 100% by weight).

6. The polypropylene resin composition according to claim 1, wherein the propylene random copolymer (A') is a propylene-ethylene random copolymer.

7. A polypropylene-based resin composition described in any one of claims 1 to 5, wherein the heterophasic propylene polymer material is produced by forming a propylene homopolymer in a first polymerization step and forming a propylene-ethylene copolymer in a second polymerization step.

8. The polypropylene resin composition according to claim 1, wherein the ethylene-α-olefin copolymer (B) is at least one selected from the group consisting of ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-1-decene copolymer, ethylene-(3-methyl-1-butene) copolymer, and copolymers of ethylene and an α-olefin having a cyclic structure.

9. A polypropylene resin composition described in any one of claims 1 to 5, wherein the ethylene-α-olefin copolymer (B) is at least one selected from the group consisting of ethylene-octene random copolymers and ethylene-butene random copolymers.

10. A polypropylene resin composition described in any one of claims 1 to 5, wherein the nucleating agent (E) is represented by at least one selected from the group consisting of the following structural formulas: 【Chemistry 2】

11. A polypropylene resin composition described in any one of claims 1 to 5, wherein the nucleating agent (E) is represented by the following structural formula: 【Chemistry 3】

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

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