Polypropylene-based resin composition

Abstract

A polypropylene resin composition which contains: from 20% by weight to 50% by weight of a heterophasic propylene polymerization material (A) that has a melt flow rate of from 70 g / 10 minutes to 300 g / 10 minutes as determined at 230°C under a load of 2.16 kgf in accordance with JIS-K-6758; from 15% by weight to 40% by weight of an ethylene / α-olefin copolymer (B-1) that has a melt flow rate of from 2 g / 10 minutes to 100 g / 10 minutes as determined at 190°C under a load of 2.16 kgf in accordance with JIS-K-7210; from 10% by weight to 20% by weight of an ethylene / α-olefin copolymer (B-2) that has a melt flow rate of 1 g / 10 minutes or less as determined at 190°C under a load of 2.16 kgf in accordance with JIS-K-7210; from 20% by weight to 40% by weight of glass fibers (C); and from 0.1% by weight to 5% by weight of an acid-modified polyolefin (D).

Description

Technical Field

[0001] The present invention relates to a polypropylene-based resin composition.

Background Art

[0002] Molded articles obtained by molding polypropylene-based resin compositions are used in various applications such as automotive interior materials and home appliance materials such as instrument panels. In these applications, impact resistance, scratch resistance, etc. are required. As a composition for molding having excellent performance in these respects, for example, Patent Document 1 describes a polymer composition containing a first polymer component containing a relatively hard thermoplastic resin, a second polymer component, and a reinforcing material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the polymer composition described in Patent Document 1 has a problem that the impact strength is insufficient and warpage occurs in the molded article. Under such circumstances, the problem to be solved by the present invention is to provide a polypropylene-based resin composition capable of obtaining a molded article having high impact strength and little warpage while maintaining excellent scratch resistance of the molded article.

Means for Solving the Problems

[0005] The present inventor earnestly studied in view of such a background and completed the present invention. That is, the present invention is as follows. [1] A heterophasic propylene polymer material (A) having a melt flow rate measured at 230°C under a load of 2.16 kgf in accordance with JIS-K-6758 of 70 g / 10 min or more and 300 g / 10 min or less is 20% by weight or more and 50% by weight or less, An ethylene-α-olefin copolymer (B-1) having a melt flow rate measured at 190°C under a load of 2.16 kgf in accordance with JIS-K-7210 of 2 g / 10 min or more and 100 g / 10 min or less is 15% by weight or more and 40% by weight or less, An ethylene-α-olefin copolymer (B-2) having a melt flow rate measured at 190°C under a load of 2.16 kgf in accordance with JIS-K-7210 of 1 g / 10 min or less is 10% by weight or more and 20% by weight or less, Glass fiber (C) is 20% by weight or more and 40% by weight or less, The polypropylene resin composition contains 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D) (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

[0006] Hereinafter, [2] to [9] are respectively preferred embodiments or implementation forms of the present invention. [2] The polypropylene resin composition according to [1], further comprising a lubricant (F). [3] The polypropylene resin composition according to [2], wherein the lubricant (F) contains a fatty acid amide (F-1). [4] The polypropylene resin composition according to [3], wherein the content of the fatty acid amide (F-1) is 0.1% by weight or more and 1.0% by weight or less (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight). [5] The polypropylene resin composition according to any one of [2] to [4], wherein the lubricant (F) contains a silicone-based lubricant (F-2). [6] The polypropylene resin composition according to [5], wherein the content of the silicone-based lubricant (F-2) is 0.5% by weight or more and 3.0% by weight or less (wherein the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight). [7] The polypropylene resin composition according to any one of [1] to [6], further comprising a nucleating agent (E). [8] The polypropylene resin composition according to [7], wherein the content of the nucleating agent (E) is 0.01% by weight or more and 0.5% by weight or less (wherein the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight). [9] A molded article comprising the polypropylene resin composition according to any one of [1] to [8].

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a polypropylene resin composition capable of obtaining a molded article having high impact strength and little warpage while maintaining excellent scratch resistance.

Embodiments for Carrying Out the Invention

[0008] The polypropylene resin composition of the present invention is a heterophasic propylene polymerization material (A) having a melt flow rate measured at 230 ° C. and a load of 2.16 kgf in accordance with JIS-K-6758 of 70 g / 10 min or more and 300 g / 10 min or less, and 20% by weight or more and 50% by weight or less, an ethylene-α-olefin copolymer (B-1) having a melt flow rate measured at 190 ° C. and a load of 2.16 kgf in accordance with JIS-K-7210 of 2 g / 10 min or more and 100 g / 10 min or less, and 15% by weight or more and 40% by weight or less, an ethylene-α-olefin copolymer (B-2) having a melt flow rate measured at 190 ° C. and a load of 2.16 kgf in accordance with JIS-K-7210 of 1 g / 10 min or less, and 10% by weight or more and 20% by weight or less, glass fiber (C) of 20% by weight or more and 40% by weight or less, A polypropylene-based resin composition containing 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D) (provided that the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

[0009] Heterophagic propylene polymerization material (A) The polypropylene-based resin composition contains a heterophasic propylene polymerization material (A). The heterophasic propylene polymerization material (A) can be produced, for example, by carrying out a first polymerization step for forming a polymer (I) and a second polymerization step for forming a polymer (II). Examples of the polymerization catalyst, polymerization method and polymerization system employed in these polymerization steps are the same as those described above.

[0010] The polymer (I) may be, for example, a propylene homopolymer or may contain monomer units derived from monomers other than propylene. When the polymer (I) contains monomer units derived from monomers other than propylene, the content 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).

[0011] Examples of monomers 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 preferable, at least one selected from the group consisting of ethylene, 1-butene, 1-hexene and 1-octene is more preferable, and at least one selected from the group consisting of ethylene and 1-butene is even more preferable.

[0012] Examples of polymers containing monomer units derived from monomers other than propylene include propylene-ethylene copolymers, propylene-1-butene copolymers, propylene-1-hexene copolymers, propylene-1-octene copolymers, propylene-ethylene-1-butene copolymers, propylene-ethylene-1-hexene copolymers and propylene-ethylene-1-octene copolymers.

[0013] From the viewpoint of the 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.

[0014] The content of the polymer (I) is preferably 50 to 99% by mass, more preferably 60 to 90% by mass, based on the total mass of the heterophasic propylene polymerization material.

[0015] The 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 4 to 12 carbon atoms, and contains monomer units derived from propylene.

[0016] In the polymer (II), the content of the monomer units derived from at least one α-olefin selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms may be 25 to 60% by mass, or may be 30 to 60% by mass.

[0017] In the polymer (II), as the at least one α-olefin selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms, at least one selected from the group consisting of ethylene and α-olefins having 4 to 10 carbon atoms is preferable, at least one selected from the group consisting of ethylene, 1-butene, 1-hexene, 1-octene, and 1-decene is more preferable, and at least one selected from the group consisting of ethylene and 1-butene is still more preferable.

[0018] Examples of the polymer (II) include 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. Among them, a propylene-ethylene copolymer, a propylene-1-butene copolymer, and a propylene-ethylene-1-butene copolymer are preferred, and a propylene-ethylene copolymer is more preferred.

[0019] The content of the polymer (II) is preferably 1 to 50% by mass, more preferably 10 to 40% by mass, based on the total mass of the heterophasic propylene polymerization material.

[0020] The content of the CXIS component in the heterophasic propylene polymerization material is preferably 50 to 99% by mass, more preferably 60 to 90% by 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% by mass, more preferably 10 to 40% by mass, based on the total mass of the heterophasic propylene polymerization material.

[0021] In this embodiment, it is considered that the xylene-insoluble (CXIS) component in the heterophasic propylene polymerization material is mainly composed of the polymer (I), and the xylene-soluble (CXS) component in the heterophasic propylene polymerization material is mainly composed of the polymer (II).

[0022] Examples of heterophasic propylene polymerization materials include, for example, (propylene)-(propylene-ethylene) polymerization materials, (propylene)-(propylene-ethylene-1-butene) polymerization materials, (propylene)-(propylene-ethylene-1-hexene) polymerization materials, (propylene)-(propylene-ethylene-1-octene) polymerization materials, (propylene)-(propylene-1-butene) polymerization materials, (propylene)-(propylene-1-hexene) polymerization materials, (propylene)-(propylene-1-octene) polymerization materials, (propylene)-(propylene-1-decene) polymerization 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-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-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) polymerization materials can be mentioned.

[0023] Here, the description of "(propylene)-(propylene-ethylene) polymerization material" means "a heterophasic propylene polymerization material in which polymer (I) is a propylene homopolymer and polymer (II) is a propylene-ethylene copolymer". The same applies to other similar expressions.

[0024] As the heterophasic propylene polymerization material, (propylene)-(propylene-ethylene) polymerization material, (propylene)-(propylene-ethylene-1-butene) polymerization material, (propylene-ethylene)-(propylene-ethylene) polymerization material, (propylene-ethylene)-(propylene-ethylene-1-butene) polymerization material, or (propylene-1-butene)-(propylene-1-butene) polymerization material is preferable, and (propylene)-(propylene-ethylene) polymerization material is more preferable.

[0025] The intrinsic viscosity ([η]I) of polymer (I) 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.

[0026] The intrinsic viscosity ([η]II) of 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.

[0027] Also, the ratio ([η]II / [η]I) of the intrinsic viscosity ([η]II) of polymer (II) to the intrinsic viscosity ([η]I) of polymer (I) is preferably from 1 to 20, more preferably from 1 to 10, and even more preferably from 1 to 9.

[0028] As a method for measuring the intrinsic viscosity ([η]I) of polymer (I), for example, a method of measuring the intrinsic viscosity of the polymer after forming polymer (I) can be mentioned.

[0029] The intrinsic viscosity ([η]II) of the polymer (II) can be calculated, for example, by the following formula (6) using the intrinsic viscosity ([η]Total) of the heterophasic propylene polymerization material, the intrinsic viscosity ([η]I) of the polymer (I), and the contents of the polymer (II) and the polymer (I).

[0030] [η]II = ([η]Total - [η]I × XI) / XII ···(6) [η]Total: Intrinsic viscosity of the heterophasic propylene polymerization material (dL / g) [η]I: Intrinsic viscosity of the polymer (I) (dL / g) XI: Ratio of the mass of the polymer (I) to the total mass of the heterophasic propylene polymerization material (mass of the polymer (I) / mass of the heterophasic propylene polymerization material) XII: Ratio of the mass of the polymer (II) to the total mass of the heterophasic propylene polymerization material (mass of the polymer (II) / mass of the heterophasic propylene polymerization material)

[0031] Here, XI and XII can be determined from the mass balance during polymerization.

[0032] Note that XII may be calculated using the following formula by measuring the heat of fusion of the polymer (I) and the heat of fusion of the heterophasic propylene polymerization material. XII = 1 - (ΔHf)T / (ΔHf)P (ΔHf)T: Heat of fusion of the heterophasic propylene polymerization material (J / g) (ΔHf)P: Heat of fusion of the polymer (I) (J / g)

[0033] The intrinsic viscosity ([η]CXIS) of the CXIS component 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.

[0034] The intrinsic viscosity ([η]CXS) of the CXS component is preferably from 1.00 to 10.00 dL / g, more preferably from 2.00 to 10.00 dL / g, and still more preferably from 2.00 to 8.00 dL / g.

[0035] The ratio ([η]CXS / [η]CXIS) of the intrinsic viscosity ([η]CXS) of the CXS component to the intrinsic viscosity ([η]CXIS) of the CXIS component is preferably from 1 to 20, more preferably from 1 to 10, and still more preferably from 1 to 9.

[0036] From the viewpoints of the rigidity and dimensional stability of the molded article comprising the resin composition, the isotactic pentad fraction (also referred to as the [mmmm] fraction) of the polymer (I) is preferably 0.950 or more, and more preferably 0.970 or more. The isotactic pentad fraction of the polymer (I) may be, for example, 1.000 or less.

[0037] The isotactic pentad fraction means the isotactic fraction in pentad units. That is, the isotactic pentad fraction indicates the content ratio of a structure in which five monomer units derived from propylene are continuously meso-bonded when viewed in pentad units. When the component of interest is a copolymer, it refers to the value measured for the chain of monomer units derived from propylene.

[0038] In the present specification, the isotactic pentad fraction refers to 13 the value measured by 13C-NMR spectrum. Specifically, 13 the ratio of the area of the mmmm peak to the total absorption peak area in the methyl carbon region obtained by 13C-NMR spectrum is defined as the isotactic pentad fraction. Note that 13 the method for measuring the isotactic pentad fraction by 13C-NMR spectrum is described, for example, in Macromolecules, 6, 925 (1973) by A. Zambelli et al. However, 13The assignment of the absorption peaks obtained by the C-spectrum shall be based on the description in Macromolecules, 8, 687 (1975).

[0039] From the viewpoint of the moldability of the resin composition, 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.

[0040] In this specification, the melt flow rate of the heterophasic propylene / propylene polymerization material (A) refers to the value measured at 230°C and a load of 2.16 kgf in accordance with JIS K6758. Also, the melt flow rate may be hereinafter referred to as MFR. The melt flow rate of the heterophasic propylene / propylene polymerization material (A) is 70 g / 10 min or more and 300 g / 10 min or less, preferably 80 g / 10 min or more and 250 g / 10 min or less, and more preferably 90 g / 10 min or more and 200 g / 10 min or less.

[0041] The content of the heterophasic propylene polymerization material (A) in the polypropylene-based resin composition is 20% by weight or more and 50% by weight or less, preferably 25% by weight or more and 50% by weight or less, based on the total amount of the above (A), (B-1), (B-2), (C) and (D) being 100% by weight.

[0042] Ethylene-α-olefin copolymer (B-1) and (B-2) The polypropylene-based resin composition contains ethylene-α-olefin copolymers (B-1) and (B-2). In the following, the components (B-1) and (B-2) may be collectively referred to as "component B". In component B, based on the total mass of component B being 100% by mass, the total content of the monomer units derived from ethylene and the monomer units derived from α-olefins having 4 or more carbon atoms contained in component B may be 100% by mass.

[0043] 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. Among them, 1-butene, 1-hexene, and 1-octene are preferred. The above α-olefin may be an α-olefin having a cyclic structure such as vinylcyclopropane or vinylcyclobutane.

[0044] Examples of component B include ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-1-decene copolymer, ethylene-(3-methyl-1-butene) copolymer, and a copolymer of ethylene and an α-olefin having a cyclic structure.

[0045] In component B, the content of monomer units derived from α-olefins having 4 or more carbon atoms is preferably 1 to 49% by mass, more preferably 5 to 49% by mass, and still more preferably 24 to 49% by mass based on the total mass of component B.

[0046] Component (B-1) is an ethylene-α-olefin copolymer (B-1) having a melt flow rate of 2 g / 10 min or more and 100 g / 10 min or less measured at 190 °C under a load of 2.16 kgf in accordance with JIS-K-7210. The melt flow rate is preferably 2 g / 10 min or more and 60 g / 10 min or less, and more preferably 3 g / 10 min or more and 50 g / 10 min or less. Component (B-2) is an ethylene-α-olefin copolymer (B-2) having a melt flow rate of 1 g / 10 min or less measured at 190 °C under a load of 2.16 kgf in accordance with JIS-K-7210. The melt flow rate is preferably 0.9 g / 10 min or less, and more preferably 0.8 g / 10 min or less.

[0047] The density of component B is preferably 0.850 to 0.890 g / cm 3 and more preferably 0.850 to 0.880 g / cm3 is more preferably, 0.855 to 0.870 g / cm 3 and even more preferably.

[0048] Component B can be produced by polymerizing ethylene and an α-olefin having 4 or more carbon atoms using a polymerization catalyst.

[0049] Examples of the polymerization catalyst include homogeneous catalysts typified by metallocene catalysts and Ziegler-Natta type catalysts.

[0050] Examples of the homogeneous catalyst include a catalyst composed of a compound of a Group 4 transition metal of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane; a catalyst composed of a compound of a Group 4 transition metal 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 obtained by supporting and modifying inorganic particles (such as silica and clay minerals) with catalyst components (such as a compound of a Group 4 transition metal of the periodic table having a cyclopentadienyl ring, a compound that forms an ionic complex, and an organoaluminum compound).

[0051] Examples of the Ziegler-Natta type catalyst include a catalyst obtained by combining a titanium-containing solid transition metal component and an organometallic component.

[0052] As component B, commercially available products may be used. Examples of commercially available component B include ENGAGE (registered trademark) manufactured by The Dow Chemical Company Japan, TUFMER (registered trademark) manufactured by Mitsui Chemicals, Inc., NEOZEX (registered trademark) and ULTRAZEX (registered trademark) manufactured by Prime Polymer Co., Ltd., EXXELEN FX (registered trademark), SUMIKASEN (registered trademark), and ESPREN SPO (registered trademark) manufactured by Sumitomo Chemical Co., Ltd.

[0053] The content of the ethylene-α-olefin copolymer (B-1) in the polypropylene resin composition is 15% by weight or more and 40% by weight or less, preferably 15% by weight or more and 35% by weight or less, and more preferably 15% by weight or more and 30% by weight or less, based on the total amount of (A), (B-1), (B-2), (C) and (D) being 100% by weight. The content of the ethylene-α-olefin copolymer (B-2) in the polypropylene resin composition is 10% by weight or more and 20% by weight or less, preferably 10% by weight or more and 18% by weight or less, and more preferably 10% by weight or more and 16% by weight or less, based on the total amount of (A), (B-1), (B-2), (C) and (D) being 100% by weight.

[0054] Glass fiber (C) The polypropylene resin composition contains glass fiber (C). The glass fiber is not particularly limited and can be used. Examples of the type of glass used for the fiber include E glass, C glass, A glass, S glass, etc., and among them, E glass is preferred. The manufacturing method of the glass fiber is not particularly limited and is manufactured by various known manufacturing methods. The polypropylene resin composition may contain only one type of glass fiber or two or more types of glass fibers.

[0055] The length of the glass fiber is preferably 2 to 20 mm, more preferably 3 to 10 mm. From the viewpoint of the rigidity of the obtained molded body, the length of the glass fiber is preferably 2 mm or more. From the viewpoints of embossing transferability, touch feeling and moldability (fluidity), the length of the glass fiber is preferably 20 mm or less. In this specification, when the fiber length is a normal roving-like or strand-like fiber, the length of the glass fiber before melt-kneading is used as the raw material as it is. However, in the case of glass fiber-containing pellets obtained by melt extrusion processing described later and integrating a large number of continuous glass fibers, since the length of one side (extrusion direction) of the pellet is substantially the same as the length of the fiber in the pellet, the length of one side (extrusion direction) of the pellet is taken as the fiber length. Here, "substantially" specifically means that, based on the total number of fibers in the fiber-containing pellet, in 50% or more, preferably 90% or more, the length is the same as the length (extrusion direction) of the carbon fiber-containing pellet, and there is almost no fiber breakage during the preparation of the pellet. In this specification, the fiber length is measured by a microscope, and the average value of the lengths of 100 or more fibers is calculated to obtain it. The specific measurement is as follows: Glass fibers are mixed with water containing a surfactant, and the mixed aqueous solution is dropped and diffused on a thin glass plate. Then, using a digital microscope (for example, VHX-900 type manufactured by Keyence Corporation), the lengths of 100 or more glass fibers are measured and the average value is calculated.

[0056] Also, the fiber diameter of the glass fiber is preferably 3 to 25 μm, more preferably 6 to 20 μm. From the perspective of preventing breakage of the glass fiber during the production and molding of the resin composition and its molded article, the fiber diameter is preferably 3 μm or more. From the perspective of the rigidity of the obtained molded article, the fiber diameter is preferably 25 μm or less. The fiber diameter is obtained by cutting the fiber perpendicularly to the fiber length direction, observing the cross-section under a microscope to measure the diameter, and calculating the average value of the diameters of 100 or more fibers.

[0057] Both surface-treated and untreated glass fibers can be used. However, in order to improve the dispersibility in polypropylene-based resins, etc., it is preferable to use those surface-treated with an organic silane coupling agent, titanate coupling agent, aluminate coupling agent, zirconate coupling agent, silicone compound, higher fatty acid, fatty acid metal salt, fatty acid ester, etc.

[0058] Further, glass fibers that have been surface-treated with a sizing agent may be used. Examples of sizing agents include epoxy sizing agents, aromatic urethane sizing agents, aliphatic urethane sizing agents, acrylic sizing agents, and maleic anhydride-modified polyolefin sizing agents. Since these sizing agents need to melt during melt-kneading with the polypropylene-based resin, it is preferable that they melt at 200°C or lower.

[0059] Both surface-treated and untreated glass fibers can be used. However, in order to improve the dispersibility in the polypropylene-based resin, it is preferable to use those surface-treated with an organic silane coupling agent, titanate coupling agent, aluminate coupling agent, zirconate coupling agent, silicone compound, higher fatty acid, fatty acid metal salt, fatty acid ester, or the like.

[0060] Examples of the organic silane coupling agent used for surface treatment include vinyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, and the like. Examples of the titanate coupling agent include isopropyltriisostearoyl titanate, isopropyltris(dioctylpyrophosphate) titanate, isopropyltri(N-aminoethyl) titanate, and the like. Examples of the aluminate coupling agent include acetoxyaluminum diisopropylate, and the like. Examples of the zirconate coupling agent include tetra(2,2-diallyloxymethyl)butyl, bis(tridecyl)phosphitozirconate; neopentyl(diallyl)oxy, trineodecanoylzirconate. Examples of the silicone compound include silicone oil, silicone resin, and the like.

[0061] Furthermore, examples of the higher fatty acids used for the surface treatment include oleic acid, capric acid, lauric acid, palmitic acid, stearic acid, montanic acid, abietic acid, linoleic acid, rosin acid, linolenic acid, undecanoic acid, undecenoic acid, and the like. Examples of the metal salts of higher fatty acids include sodium salts, lithium salts, calcium salts, magnesium salts, zinc salts, aluminum salts, etc. of fatty acids having 9 or more carbon atoms, such as stearic acid and montanic acid. Among them, calcium stearate, aluminum stearate, calcium montanate, and sodium montanate are preferred. Examples of the fatty acid esters include polyhydric alcohol fatty acid esters such as glycerin fatty acid ester, alpha-sulfonated fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyethylene fatty acid ester, sucrose fatty acid ester, and the like. The amount of the surface treatment agent used is not particularly limited, but preferably 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, based on 100 parts by weight of the glass fiber.

[0062] The glass fiber can also be used as a so-called chopped strand glass fiber obtained by cutting the fiber roving into a desired length. Among these, from the viewpoints 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 and cutting strands in which glass fibers are converged to 2 mm to 20 mm.

[0063] Specific examples of the glass fiber include those manufactured by Nippon Electric Glass Co., Ltd. (T480H).

[0064] In addition, these glass fibers can be melt-extruded and integrally combined with an arbitrary amount of, for example, the above components (A), (B-1) and / or (B-2) in advance to form a "glass fiber-containing pellet", which is preferable from the viewpoint of further enhancing various improvement effects such as the embossing transferability and rigidity 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 (extrusion direction) of the glass fiber-containing pellets, 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.

[0065] Also, in the glass fiber-containing pellets, the content of the glass fiber is preferably 20% by weight to 70% by weight based on 100% by weight of the whole pellets. When glass fiber-containing pellets having a glass fiber content of less than 20% by weight are used in the present invention, physical properties such as the rigidity of the resin composition and its molded article may deteriorate. On the other hand, when those having a content exceeding 70% by weight are used, there is a risk of deteriorating the embossing transferability, touch feeling, moldability (fluidity), etc.

[0066] The content of the glass fiber (C) in the polypropylene-based resin composition is 20% by weight or more and 40% by weight or less, preferably 20% by weight or more and 38% by weight or less, more preferably 20% by weight or more and 36% by weight or less, based on 100% by weight of the total amount of (A), (B-1), (B-2), (C) and (D).

[0067] Acid-modified polyolefin (D) The polypropylene-based resin composition contains an acid-modified polyolefin (D). In the following, the acid-modified polyolefin (D) may sometimes be referred to as a "modified polyolefin resin". As the modified polyolefin resin (acid-modified polyolefin (D)), for example, it is 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 composed 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 an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative with a homopolymer of one type of olefin or a copolymer of two or more types of olefins, and has a partial structure derived from an unsaturated carboxylic acid or an unsaturated carboxylic acid derivative in the molecule. Specifically, the following modified polyolefin resins (a) to (c) can be mentioned. The polypropylene-based resin composition may contain one type of modified polyolefin resin or may contain two or more types of modified polyolefin resins. (a): A modified polyolefin resin obtained by graft-polymerizing an unsaturated carboxylic acid and / or an unsaturated carboxylic acid derivative onto a homopolymer of an olefin. (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.

[0068] Examples of the above unsaturated carboxylic acids include maleic acid, fumaric acid, itaconic acid, acrylic acid, methacrylic acid, and the like. Examples of the unsaturated carboxylic acid derivative include acid anhydrides, ester compounds, amide compounds, imide compounds, metal salts, etc. of unsaturated carboxylic acids. 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, monoethyl maleate, diethyl maleate, monomethyl fumarate, dimethyl fumarate, acrylamide, methacrylamide, maleic monoamide, maleic diamide, fumaric monoamide, maleimide, N-butyl maleimide, sodium methacrylate, etc. 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.

[0069] The modified polyolefin resin is preferably the above (c). More preferably, it is a modified polyolefin resin obtained by graft-polymerizing maleic anhydride onto a polyolefin resin containing units derived from ethylene and / or propylene as main constituent units.

[0070] From the viewpoints of the rigidity and hardness of the molded article obtained from the resin composition, the content of the constituent units derived from the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative contained in the modified polyolefin resin is preferably 0.1% by weight to 20% by weight, more preferably 0.1% by weight to 10% by weight (however, the amount of the modified polyolefin resin is taken as 100% by weight). Note that as the content of the constituent units derived from the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative, a value calculated by quantifying the absorption based on the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative by infrared absorption spectrum or NMR spectrum is used.

[0071] The grafting 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 viewpoints of the rigidity and impact strength of the molded article obtained from the resin composition. The "grafting efficiency of the modified polyolefin resin" means "the ratio of the amount of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative chemically bonded to the resin to the total amount of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative contained in the modified polyolefin resin and not chemically bonded to the resin". The grafting efficiency in the graft polymerization of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative can be determined by the following procedures (1) to (9). (1) Dissolve 1.0 g of the modified polyolefin resin in 100 ml of xylene; (2) Dropwise add the xylene solution to 1000 ml of methanol with stirring to reprecipitate the modified polyolefin resin; (3) Recover the reprecipitated modified polyolefin resin; (4) Vacuum dry the recovered modified polyolefin resin at 80 °C for 8 hours to obtain a purified modified polyolefin resin; (5) Hot press the purified modified polyolefin resin to produce a film with a thickness of 100 μm; (6) Measure the infrared absorption spectrum of the film; (7) Quantify the absorption based on the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative from the infrared absorption spectrum, and calculate 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. (8) Separately, for the unpurified modified polyolefin resin, perform the above steps (5) to (6), and calculate the content (X2) of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative in the unpurified modified polyolefin resin from its infrared absorption spectrum (X2 is the sum of the content (X1) of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative reacted with the polyolefin resin and the content of the unsaturated carboxylic acid and / or unsaturated carboxylic acid derivative that has not reacted with the polyolefin resin (i.e., free)); (9) Calculate the grafting efficiency from the formula: grafting efficiency = X1 / X2.

[0072] 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 from the viewpoints of mechanical strength and production stability. The MFR is a value measured at 230 °C and a load of 2.16 kgf in accordance with JIS K7210.

[0073] The content of the acid-modified polyolefin (D) in the polypropylene-based resin composition is 0.1 wt% or more and 5 wt% or less, preferably 0.3 wt% or more and 5 wt% or less, and more preferably 0.5 wt% or more and 5 wt% or less, with the total amount of (A), (B-1), (B-2), (C), and (D) being 100 wt%.

[0074] Nucleating agent (E) The polypropylene-based resin composition may further contain a nucleating agent (E). In the present invention, examples of the nucleating agent (E) include those represented by the following general formula (I).

Chemical formula

[0075] Examples of the C1-C9 alkyl group for R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, etc., examples of the C1-C9 alkoxy group include a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, etc., examples of the C1-C9 alkylamino group include a methylamino group, an ethylamino group, a dimethylamino group, a diethylamino group, etc., examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc., and examples of the C1-C9 alkyleneoxy group 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. However, the total number of carbon atoms of R and R’ is 9 or less.)

[0076] As the group represented by the general formula (II), preferably, H-(CH2CH2O)2-, H-(CH2CH2O)3-, H-(CH2CH2O)4-, CH3-(CH2CH2O)2-, CH3-(CH2CH2O)3-, CH3-(CH2CH2O)4-, C2H5-(CH2CH2O)2-, C2H5-(CH2CH2O)3-, C3H7-(CH2CH2O)2-, C3H7-(CH2CH2O)3-, H-(CH(CH3)CH2O)2-, H-(CH(CH3)CH2O)3-, CH3-(CH(CH3)CH2O)2- or C2H5-(CH(CH3)CH2O)2-.

[0077] As the nucleating agent (E) represented by the general formula (I), for example, it is a compound represented by the following structural formula etc. Note that the following is an example where M1 and M2 are calcium, but sodium and others are also included.

Chemical formula

Chemical formula

Chemical formula

[0078] As the nucleating agent (E), preferably, it is 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 a calcium salt of 1,2-cyclohexanedicarboxylic acid represented by the following structural formula.

Chemical formula

[0079] The nucleating agent (E) may be used by mixing it with a dispersant in order to improve its dispersibility in the polypropylene resin composition. Examples of the dispersant include fatty acids, alkyl esters of fatty acids, metal salts of fatty acids, alcohols having 10 to 30 carbon atoms, polyhydric alcohols, and their esters. As the fatty acid, preferably, it is 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 an alkaline earth metal. Examples of the alkali metal include sodium, potassium, and lithium, and examples of the alkaline earth metal include calcium, magnesium, zinc, etc. Also, examples of the polyhydric alcohol and its esters include glycerin, ethylene glycol, propylene glycol, pentaerythritol, dipentaerythritol, tripentaerythritol, sorbitol, and its esters. Among them, the metal salt of the fatty acid is preferably used.

[0080] The form of the nucleating agent (E) is preferably particulate. As the particle size of the nucleating agent (E), the average particle size determined by the laser diffraction particle size distribution measurement method is 0.01 to 10 μm, preferably 0.01 to 5 μm, and more preferably 0.01 to 3 μm. Incidentally, the laser diffraction particle size distribution measurement method is a method of measuring the particle size distribution using a laser diffraction particle size distribution measuring device (HELOS (trade name) manufactured by Sympatec).

[0081] Examples of the production method of the nucleating agent (E) include the methods described in JP-T-2004-525227 and JP-T-2009-504842. Also, regarding calcium 1,2-cyclohexanedicarboxylate, Hyperform HPN-20E (registered trademark, calcium 1,2-cyclohexanedicarboxylate content: 66% by weight) can be obtained from Milliken Chemical and Milliken Japan Co., Ltd.

[0082] The most preferred nucleating agent (E) is as follows. (Registered trademark) Hyperform HPN-68L (manufactured by Milliken Japan Co., Ltd.) Chemical name of the main component: Disodium =(1R,2R,3S,4S)-bicyclo[2.2.1]heptane-2,3-dicarboxylate (containing 80% by weight) Chemical structural formula of the main component: as follows [Chemical formula]

[0083] The content of the nucleating agent (E) in the polypropylene resin composition is preferably 0.01% by weight or more and 0.5% by weight or less, with the total amount of the above (A), (B-1), (B-2), (C) and (D) being 100% by weight.

[0084] Lubricant (F) The polypropylene resin composition may further contain a lubricant (F). In the present invention, as the lubricant (F), those conventionally known in the art can be appropriately used. The lubricant (F) is preferably a fatty acid amide (F-1); a silicone-based lubricant (F-2) such as silicone oil and silicone gum; a fatty acid metal salt; a higher alcohol, and more preferably a fatty acid amide (F-1) and a silicone-based lubricant (F-2). The polypropylene resin composition may contain only one kind of the lubricant (F) or two or more kinds thereof. As the fatty acid residue of the fatty acid amide (F-1), residues derived from saturated and unsaturated fatty acids having about 5 to 30 carbon atoms can be mentioned. The fatty acid amide is preferably a compound represented by RCONH2 (wherein R represents an alkyl group 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 palmitoamide, n-oleyl erucamide, and dimers thereof. These lubricants are preferable for improving the stickiness during use peculiar to the case of using a random polypropylene-based polymer. Among them, erucic acid amide is particularly preferable. The polypropylene-based resin composition may contain only one kind of the fatty acid amide (F-1) or may contain two or more kinds. Examples of commercially available products include Diamid Y manufactured by Nippon Chemical Industry Co., Ltd., Armide HT-P manufactured by Lion Akzo Co., Ltd., Neutron manufactured by Nippon Seika Co., Ltd., Diamid KN manufactured by Nippon Chemical Industry Co., Ltd., Neutron S manufactured by Nippon Seika Co., Ltd., and the like. The content of the fatty acid amide (F-1) in the polypropylene-based resin composition is preferably 0.1% by weight or more and 1.0% by weight or less, with the total amount of the above (A), (B-1), (B-2), (C) and (D) being 100% by weight.

[0085] Preferable examples of the silicone-based lubricant (F-2) include silicone oil, high molecular weight silicone (silicone gum), silicone powder, and the like. Preferable examples of the silicone oil include dimethyl silicone oil, phenylmethyl silicone oil, alkyl silicone oil, fluorosilicone oil, tetramethyltetraphenyltrisiloxane, modified silicone oil, and the like. As the high molecular weight silicone (silicone gum), those having a weight average molecular weight of 100,000 or more are usually used. By using such high molecular weight silicone (silicone gum), it can entangle with the molecules of the constituent materials and maintain the surface state over a long period of time. The weight average molecular weight of the silicone gum is preferably from 100,000 to 800,000, more preferably from 450,000 to 650,000. Further, as the high molecular weight silicone (silicone gum), non-crosslinkable ones are preferable. The polypropylene resin composition may contain only one kind of silicone-based lubricant (F-2), or may contain two or more kinds. The content of the silicone-based lubricant (F-2) in the polypropylene resin composition is preferably 0.5% by weight or more and 3.0% by weight or less, more preferably 1.0% by weight or more and 1.5% by weight or less, based on the total amount of the above (A), (B-1), (B-2), (C) and (D) being 100% by weight.

[0086] Other additives In addition, the polypropylene resin composition may contain known additives. Examples of the additives include neutralizing agents, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, antiblocking agents, processing aids, organic peroxides, colorants (inorganic pigments, organic pigments, pigment dispersants, etc.), foaming agents, foaming nuclei, plasticizers, flame retardants, crosslinking agents, crosslinking aids, brightening agents, antibacterial agents, light diffusing agents, inorganic fillers, anti-scratch agents, etc. The polypropylene resin composition may contain only one kind of these additives, or may contain two or more kinds. Among them, neutralizing agents, antioxidants, ultraviolet absorbers, light stabilizers, and colorants are preferably used. As the polypropylene resin composition, preferably, in addition to the above components, a polypropylene resin composition containing only at least one kind selected from the group consisting of organic peroxides, neutralizing agents, antioxidants, ultraviolet absorbers, light stabilizers, and colorants can be mentioned.

[0087] Examples of the neutralizing agent include metal salts of higher fatty acids (metal soaps), hydrotalcites, oxides or hydroxides of alkaline earth metals, etc. The polypropylene resin composition may contain only one kind of the neutralizing agent, or may contain two or more kinds.

[0088] As the higher fatty acid constituting the metal salt of higher fatty acid (metal soap), for example, those having 10 to 30 carbon atoms are preferable, and more preferably, those having 12 to 18 carbon atoms. As the metal salt, for example, calcium salt, sodium salt, magnesium salt, lithium salt, aluminum salt, zinc salt are preferable, and more preferably, calcium salt or zinc salt. Preferably, it is calcium salt or zinc salt of stearic acid.

[0089] The hydrotalcites may be natural minerals or synthetic products, and their crystal structure, crystal particle size, water content, etc. may be determined as appropriate. Further, if necessary, the hydrotalcites may be surface-treated.

[0090] Among the hydrotalcites, preferably, it is the hydrotalcite represented by the following formula. Mg Y Al2(OH) 2Y+4 CO3·mH2O (In the formula, Y is Y≥4, and m is a positive number.) Further, as the hydrotalcites, more preferably, it is the following hydrotalcite. 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)

[0091] The oxides or hydroxides of alkaline earth metals are the oxides or hydroxides of metal atoms in Group 2 of the periodic table, and examples include calcium oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, etc. Calcium hydroxide is preferred.

[0092] The compounding amount of the neutralizing agent is, for example, 0.001 to 0.5 parts by weight with respect to 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D). Preferably it is 0.005 to 0.2 parts by weight, more preferably 0.01 to 0.2 parts by weight.

[0093] Examples of the antioxidant include phenolic antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, hydroxylamine-based antioxidants, metal deactivators, etc. Preferably, they are phenolic antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants.

[0094] Examples of the phenolic antioxidant include, for example, 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-tetraoxaspiro[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-diethylene bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], tocopherols, etc.

[0095] Preferably, from the viewpoint of the hue stability of the polypropylene-based resin composition, it is 3,9-bis[2-{3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5·5]undecane.

[0096] The compounding amount of the phenolic antioxidant is 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 part by weight, based on 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D).

[0097] Examples of the phosphorus-based antioxidant include tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, 2,4,8,10-tetra-t-butyl-6-[3-(3-methyl-4-hydroxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine, etc., from the viewpoint of the processing stability of the polypropylene-based resin composition.

[0098] The compounding amount of the phosphorus-based antioxidant is 0.01 to 2 parts by weight, preferably 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 part by weight, based on 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D).

[0099] Examples of the sulfur-based antioxidant include dimyristyl 3,3'-thiodipropionate, neopentanetetrayl tetrakis(3-laurylthiopropionate), bis[2-methyl-4-(3-n-alkyl(C12~C14)thiopropionyloxy)-5-t-butylphenyl]sulfide, from the viewpoint of the heat aging resistance of the polypropylene-based resin composition. Here, C12 represents 12 carbon atoms and C14 represents 14 carbon atoms.

[0100] The compounding quantity of the sulfur-based antioxidant is 0.01 to 2 parts by weight with respect to 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D). Preferably it is 0.01 to 1 part by weight, and more preferably it is 0.01 to 0.5 part by weight.

[0101] Examples of the ultraviolet absorber 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, 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, 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, 2-[2’-hydroxy-3’,5’-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole and the like.

[0102] Preferably, since a resin composition excellent in hue can be obtained, it is 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, behenyl 3,5-di-t-butyl-4-hydroxybenzoate.

[0103] The compounding amount of the ultraviolet absorber is generally, typically, 0.01 to 2 parts by weight with respect to 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D). Preferably it is 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 part by weight.

[0104] As the light stabilizer, either a low molecular weight type 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, the reaction product of bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) decanedioate, 1,1-dimethylethyl hydroperoxide and octane, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, an ester mixture of 2,2,6,6-tetramethyl-4-piperidinol and a higher fatty acid, 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, The polycondensate 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}}], The polycondensate 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-(4,6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)-triazin-2-yl)-4,7-diazadecane-1,10-diamine, Examples include the mixture of {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, etc.

[0105] Preferably, since a resin composition excellent in light stability can be obtained, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) decanedioate and the reaction product of 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, bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) decanedioate and the reaction product of 1,1-dimethylethyl hydroperoxide and octane, the polycondensate 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}}].

[0106] The compounding amount of the light stabilizer is generally, typically, 0.01 to 2 parts by weight with respect to 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D). Preferably it is 0.01 to 1 part by weight, and more preferably 0.01 to 0.5 part by weight.

[0107] Examples of the colorant include inorganic pigments and organic pigments. Examples of the inorganic pigment 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 Prussian blue. Examples of the organic pigment 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 may contain two or more types. In addition, 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 is, for example, 0.001 to 10 parts by weight, preferably 0.005 to 5 parts by weight, and more preferably 0.01 to 3 parts by weight, based on 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (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 is, for example, 0.001 to 5 parts by weight, preferably 0.005 to 1 part by weight, and more preferably 0.01 to 1 part by weight, based on 100 parts by weight of the resin composition containing the components (A), (B-1), (B-2), (C) and (D).

[0108] The polypropylene resin composition may contain resins and rubbers other than the components (A), (B-1), (B-2), (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 resins, ethylene / vinyl alcohol copolymer resin, fluororesins, polyacetal, grafted polyphenylene ether resin and polyphenylene sulfide resin, polyurethane, polyamide, polyester resins (e.g., polyethylene terephthalate, polybutylene terephthalate), polycarbonate, polysulfone, polyetheretherketone, polyethersulfone, thermoplastic resins such as aromatic polyester resins, epoxy resins, diallyl phthalate prepolymers, silicone resins, silicone rubbers, polybutadiene, 1,2-polybutadiene, polyisoprene, styrene / butadiene copolymer, butadiene / acrylonitrile copolymer, epichlorohydrin rubber, acrylic rubber, natural rubber, etc. can be mentioned.

[0109] In addition, the polypropylene-based resin composition may contain a polymer produced by polymerizing a plant-derived monomer extracted from a bio-based raw material. For example, PLA resin (polylactic acid) etc. can be mentioned.

[0110] The polypropylene-based resin composition, the additives added thereto, other resins, rubbers, etc. can be melt-mixed at 180°C or higher, preferably 180 - 300°C, more preferably 180 - 250°C by a known method, and for melt-kneading, for example, a melt extruder, a Banbury mixer, etc. can be used.

[0111] As methods for blending the nucleating agent (E) with the components (A), (B-1), (B-2), (C), (D), etc., the following methods (1) to (3) can be exemplified. (1) A method of mixing a necessary amount of a nucleating agent (E) into a mixture comprising the necessary amounts of the components (A), (B-1), (B-2), (C), (D), etc., (2) A process (process (1)) of producing a masterbatch by mixing 100 parts by weight of any one of the components (A), (B-1), (B-2) or 100 parts by weight of a mixture comprising the components (A), (B-1), (B-2), (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 the nucleating agent (E), and a process (process (2)) of mixing the masterbatch with a mixture containing the components (A), (B-1), (B-2), (C) and (D), etc., (3) A process (process (3)) of mixing 100 parts by weight of the above 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 the nucleating agent (E) to obtain a mixture, a process (process (4)) of solidifying the mixture into granules to obtain granules, and a process (process (5)) of mixing a predetermined amount of the granules with a mixture comprising the necessary amounts of the components (A), (B-1), (B-2), (C) and (D), etc., Among them, the method (2) using a masterbatch can produce a polypropylene-based resin composition having an extremely excellent balance between tensile strength and impact resistance. The above "necessary amount" means an amount corresponding to the amount defined in the present invention, and the above "predetermined amount" means an amount such that the amount of the components in the resulting final mixture satisfies the amount defined in the present invention.

[0112] Examples of the melt-kneading apparatus used in the method for producing a polypropylene-based resin composition include known melt-kneading apparatuses. For example, single-screw extruders, co-rotating twin-screw extruders (such as ZSK (registered trademark) manufactured by Werner & Pfleiderer, TEM (registered trademark) manufactured by Toshiba Machine Co., Ltd., TEX (registered trademark) manufactured by Japan Steel Works, Ltd., KZW (registered trademark) manufactured by TechnoBelle Co., Ltd., etc.), and counter-rotating twin-screw extruders (such as CMP (registered trademark), TEX (registered trademark) manufactured by Japan Steel Works, Ltd., FCM (registered trademark), NCM (registered trademark), LCM (registered trademark) manufactured by Kobe Steel, Ltd., etc.).

[0113] Examples of the shape of the polypropylene-based resin composition include strand shape, sheet shape, flat plate shape, pellet shape obtained by cutting strands to an appropriate length, etc. From the perspective of the production stability of the resulting molded article, the shape is preferably pellet shape with a length of 1 to 50 mm for molding the polypropylene-based resin composition.

[0114] The molded article is a molded article obtained by molding a polypropylene-based resin composition by various molding methods, and the shape, size, etc. of the molded article may be determined as appropriate.

[0115] Examples of the manufacturing method of the molded article include injection molding method, press molding method, vacuum molding method, foam molding method, extrusion molding method, etc. that are usually industrially used. Also, depending on the purpose, molding methods such as laminating with resins of the same type as the polypropylene-based resin composition or other resins, co-extrusion molding methods, etc. may be mentioned.

[0116] Preferably, the molded article is an injection molded article manufactured by an injection molding method. Examples of the injection molding method include general injection molding method, injection foam molding method, supercritical injection foam molding method, ultra-high speed injection molding method, injection compression molding method, gas assist injection molding method, sandwich molding method, sandwich foam molding method, insert / outset molding method, etc.

[0117] Examples of the uses of the molded article include automotive materials, home appliance materials, monitor materials, OA equipment materials, medical materials, drain pans, toiletries materials, bottles, containers, sheets, films, building materials, etc. Preferably, they are automotive materials and home appliance materials, and more preferably, automotive materials.

[0118] Examples of automotive materials include, for example, interior parts such as door trims, pillars, instrument panels, consoles, rocker panels, armrests, door panels, spare tire covers, etc., and exterior parts such as bumpers, spoilers, fenders, side steps, etc., as well as other parts such as air intake ducts, coolant reserve tanks, fender liners, fans, under deflectors, etc., and integral molded parts such as front end panels, etc.

[0119] Examples of home appliance materials include, for example, 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, materials for air purifiers, etc.

Examples

[0120] Hereinafter, the present invention will be described in more detail with reference to Examples / Comparative Examples. It should be noted that the technical scope of the present invention is not limited by these Examples in any sense.

[0121] (1) Component (A) (Heterophagic propylene polymerization material) Component A (the following component (A-1) or component (A-2)) was produced by polymerizing a propylene homopolymer in the first polymerization step and an ethylene-propylene copolymer in the second polymerization step in the presence of a polymerization catalyst obtained by the method described in Example 1 of JP-A-2004-182981.

[0122] Component (A-1) Propylene-(propylene-ethylene) polymerization material MFR (measured at a temperature of 230°C and a load of 2.16 kgf): 138 g / 10 min Limiting viscosity number ([η]I) of the propylene homopolymer component: 0.78 dl / g Content of the propylene-ethylene copolymer component: 10.0% by weight Ethylene content of the propylene-ethylene copolymer component: 31% by weight Limiting viscosity number ([η]II) of propylene-ethylene copolymer component: 5.1 dl / g Melting point: 162 °C

[0123] Component (A-2) Propylene-(propylene-ethylene) polymerization material MFR (measured at 230 °C, 2.16 kgf load): 90 g / 10 min Limiting viscosity number ([η]I) of propylene homopolymer component: 0.79 dl / g Content of propylene-ethylene copolymer component: 11.0 wt% Ethylene content of propylene-ethylene copolymer component: 32 wt% Limiting viscosity number ([η]II) of propylene-ethylene copolymer component: 7.0 dl / g Melting point: 162 °C

[0124] (2-1) Component (B-1) (ethylene-α-olefin copolymer) (B-1-1) Ethylene-butene random copolymer Product name: Toughmer DF7350 (manufactured by Mitsui Chemicals, Inc.) Density: 0.870 (g / cm 3 ) MFR (190 °C, 2.16 kg load): 35 g / 10 min

[0125] (B-1-2) Ethylene-octene random copolymer Product name: ENGAGE EG8137 (manufactured by The Dow Chemical Company Japan Ltd.) Density: 0.870 (g / cm 3 ) MFR (190 °C, 2.16 kg load): 13 g / 10 min

[0126] (2-2) Component (B-2) (ethylene-α-olefin copolymer) (B-2-1) Ethylene-butene random copolymer Product name: ENGAGE EG7387 (manufactured by The Dow Chemical Company Japan Ltd.) Density: 0.872 (g / cm 3 ) MFR (190 °C, 2.16 kg load): 0.5 g / 10 min

[0127] (B-2-2) Ethylene-octene random copolymer Product name: ENGAGE EG8150 (manufactured by Dow Chemical Japan Co., Ltd.) Density: 0.868 (g / cm 3 ) MFR (190 °C, load 2.16 kg): 0.5 g / 10 min

[0128] (3) Component (C) (glass fiber) Glass fiber (chopped strand), Product name: TP480 (manufactured by Nippon Electric Glass Co., Ltd.)

[0129] (4) Component (D) (acid-modified polyolefin) Maleic anhydride-modified PP Product name: MPA101 (manufactured by Sumitomo Chemical Co., Ltd.)

[0130] (5) Component (E) (nucleating agent) Disodium = mixture mainly composed of (1R,2R,3S,4S)-bicyclo[2.2.1]heptane-2,3-dicarboxylate (main component: containing 80% by weight) Trade name: Hyperform HPN-68L (manufactured by Milliken Japan Co., Ltd.)

[0131] (6) Component (F) (lubricant) (F-1) Fatty acid amide Product name: Neutron-S (manufactured by Nippon Seika Co., Ltd.) Chemical name: erucic acid amide (F-2) Silicone-based lubricant A lubricant masterbatch (F'-2) containing a silicone-based lubricant was used. (F'-2) Silicone-based lubricant masterbatch Product name: TEGOMER (registered trademark) Antiscratch100 (content of organically modified siloxane compound in masterbatch is about 50% by mass) (manufactured by Evonik Industries AG)

[0132] (7) Organic peroxide masterbatch (G) An organic peroxide masterbatch containing 8% by mass of bis(tert-butylperoxyisopropyl)benzene and 92% by mass of polypropylene

[0133] (8) Pigment masterbatch (H) Carbon black-containing (content: 51%)

[0134] The physical properties were measured according to the test methods shown below. (1) Melt flow rate (MFR, unit: g / 10 min) It was measured at a load of 2.16 kg according to the method specified in JIS-K-6758. The MFR of component (A) and the polypropylene-based resin composition was measured at a temperature of 230°C, and the MFR of components (B-1) and (B-2) was measured at a temperature of 190°C (JIS-K-7210).

[0135] (2) 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 points of concentrations of 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 determined by the extrapolation method of extrapolating the concentration to zero. The calculation method of the intrinsic viscosity by the extrapolation method is described, for example, on page 491 of "Polymer Solutions, Polymer Experimental Chemistry 11" (published by Kyoritsu Shuppan Co., Ltd. in 1982).

[0136] (3) Measurement and calculation of the ratios of the propylene homopolymer component and the propylene-ethylene random copolymer component, and the intrinsic viscosities ([η]I, [η]II) From the intrinsic viscosity ([η]I) of the propylene homopolymer component obtained in the previous polymerization step, the intrinsic viscosity ([η]Total) of the final polymer (total of the propylene homopolymer component and the propylene-ethylene random copolymer component) measured by the above method after the subsequent polymerization step, and the content (weight ratio) of the propylene-ethylene random copolymer component contained in the final polymer, the intrinsic viscosity ([η]II) of the propylene-ethylene random copolymer component polymerized in the subsequent step was calculated and obtained from the following formula. [η]II = ([η]Total - [η]I × XI) / XII [η]Total: Intrinsic viscosity of the final polymer after the post-stage polymerization process (dl / g) [η]I: Intrinsic viscosity of the polymer powder withdrawn from the polymerization tank after the pre-stage polymerization process (dl / g) XI: Weight ratio of the components polymerized in the pre-stage process XII: Weight ratio of the components polymerized in the post-stage process

[0137] Here, XI and XII can be determined from the material balance during polymerization.

[0138] Note that XII may also be calculated using the following formula by measuring the heat of fusion of Polymer I and the heat of fusion of the heterophasic propylene polymerization material. XII = 1 - (ΔHf)T / (ΔHf)P (ΔHf)T: Heat of fusion of the heterophasic propylene polymerization material (J / g) (ΔHf)P: Heat of fusion of Polymer I (J / g)

[0139] (4) Ethylene content in the 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 of the entire propylene polymer composition (mass%) (C2’)II: Ethylene content of the ethylene-α-olefin copolymer (mass%)

[0140] (5) Charpy impact test (unit: kJ / m 2 ) An injection molding machine: Model M70 (clamping force: 70 tons, cylinder diameter: 32 mm) manufactured by Meiki Seisakusho Co., Ltd. was used. Injection molding was carried out under the conditions of a molding temperature of 197 °C and a mold cooling temperature of 38 °C. A test piece with an ISO mold cavity shape, Type A was produced, and the test piece was processed to 10 mm (width) × 80 mm (length) × 4 mm (thickness) and notch processed, and measured at a temperature of 23 °C according to JIS K7111.

[0141] (6) Scratch resistance Scratch (unit: %) An injection molding machine, SE180D type manufactured by Sumitomo Heavy Industries, Ltd. was used. Injection molding was carried out under the conditions of a molding temperature of 220 °C and a mold cooling temperature of 50 °C. A rectangular parallelepiped test piece with a length of 400 mm, a width of 100 mm, and a thickness of 3 mm (having a 400 mm × 100 mm surface with a rib pattern (rib surface) and a 400 mm × 100 mm back mirror surface (mirror surface)) was produced. Using a Scratch4 scratch tester manufactured by Surface Machine System, a friction element (shape: R5, width: 12 mm) was rubbed against the rib surface of the test piece 105 times under the conditions of a load of 29 N and a speed of 28 cm / second to measure the gloss, and the change rate from the gloss before scratching was determined. The smaller the change rate, the better the scratch resistance. The gloss was measured for the glossiness (incident angle: 60 degrees, specular gloss value) using a micro-gloss manufactured by BYK-Gardner.

[0142] (7) Scratch resistance Knife scratch (visual inspection) An injection molding machine, SE180D type manufactured by Sumitomo Heavy Industries, Ltd. was used. Injection molding was carried out under the conditions of a molding temperature of 220 °C and a mold cooling temperature of 50 °C. A rectangular parallelepiped test piece with a length of 400 mm, a width of 100 mm, and a thickness of 3 mm (having a 400 mm × 100 mm surface with a rib pattern (rib surface) and a 400 mm × 100 mm back mirror surface (mirror surface)) was produced. Using a Taber scratch tester manufactured by Toyo Seiki Seisakusho, a knife blade was scratched on the rib surface of the test piece with a load of 100 g and visually evaluated. Those with whitened scratches were marked as ×, and those without whitening were marked as 〇. The ones without whitening are more excellent in scratch resistance.

[0143] (8) Crystallization time (unit: seconds) Measurement was carried out using "Diamond DSC" (differential scanning calorimeter) manufactured by PerkinElmer Japan Co., Ltd. Specifically, pellets of the polypropylene-based resin composition were compression-molded into a film (100 μm) using a compression molding machine to prepare a measurement sample. Approximately 10 mg of the prepared sample was set in the DSC, and once the temperature was raised to 220°C and left in the state of 220°C for 5 minutes, the sample was completely dissolved. Then, it was rapidly cooled to 125°C under the condition of a rate of 300°C / min and the temperature was maintained until the heat quantity curve ended. The crystallization time was determined as the required time (seconds) until the maximum value (peak top) of the obtained heat quantity curve was reached. Note that the shorter the required time, the shorter the time to reach crystallization. It was considered that the shorter this crystallization time, the shorter the cooling time during molding processing and the better the molding processability.

[0144] (8) Warpage (unit: mm) Using a SE130DU type injection molding machine manufactured by Sumitomo Heavy Industries, Ltd., injection molding was carried out under the conditions of a molding temperature of 220°C and a mold cooling temperature of 40°C to prepare a disk test piece with a diameter of 200 mm and a thickness of 1 mm. The end of the test piece was held so as not to be grounded, and the height difference between the lowest value and the highest value at the end of the test piece was measured. It was considered that the smaller this height difference, the smaller the warpage and the better the quality.

[0145] (9) Melting point (unit: °C) Measurement was carried out using "Diamond DSC" (differential scanning calorimeter) manufactured by PerkinElmer Japan Co., Ltd. Specifically, pellets of the polypropylene-based resin composition were compression-molded into a film (100 μm) using a compression molding machine to prepare a measurement sample. Approximately 10 mg of the prepared sample was set in the DSC, and once the temperature was raised to 230°C and left in the state of 230°C for 5 minutes, the sample was completely dissolved. Then, it was cooled to 40°C under the condition of a rate of 5°C / min and left in the state of 40°C for 5 minutes. Then, it was heated to 230°C under the condition of a rate of 5°C / min, and the temperature at which the lowest value of the heat quantity curve during heating was taken was determined as the melting point.

[0146] [Example 1] [Production of Polypropylene-Based Resin Composition] 41 parts by mass of component (A-1), 21 parts by mass of component (B-1-1), 15 parts by mass of component (B-2-1), 21 parts by mass of component (C), 2 parts by mass of component (D), 0.05 parts by mass of component (E), 0.4 parts by mass of component (F), 0.35 parts by mass of component (G) and 3 parts by mass of component (H) were uniformly premixed, and then melt-kneaded by 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 obtained propylene resin composition are shown in Table 1 below.

[0147] [Examples 2 to 5 and Comparative Examples 1 to 2] Each component was changed to the amounts described in Table 1 to produce a polypropylene-based resin composition. The physical properties of the obtained polypropylene-based resin composition are shown in Table 1 below.

[0148] [Table 1]

[0149] Table 1 shows that the polypropylene-based resin compositions of Comparative Examples 1 to 2 are inferior (low) in Charpy impact strength. Furthermore, Table 1 shows that the polypropylene-based resin composition of Comparative Example 1 is inferior (has a high warpage value) in warpage.

Industrial Applicability

[0150] The polypropylene-based resin composition of the present invention has excellent properties such as being able to obtain a molded article with high impact strength and little warpage while maintaining excellent scratch resistance, and is therefore particularly preferably used as a material for injection molding. It is suitable for use in various applications such as various interior and exterior automotive parts such as instrument panels, glove boxes, trims, housings, pillars, bumpers, fenders, back doors, etc., various parts of household electrical appliances, various parts of housing equipment, various industrial parts, and various building materials parts, and has high applicability in various fields of industries such as the transportation machinery industry, the electric and electronic industry, and the construction industry.

Claims

1. A heterophasic propylene polymerization material (A) having a melt flow rate measured at 230 °C under a load of 2.16 kgf in accordance with JIS-K-6758 of 70 g / 10 min or more and 300 g / 10 min or less is 20% by weight or more and 50% by weight or less, An ethylene-α-olefin copolymer (B-1) having a melt flow rate measured at 190 °C under a load of 2.16 kgf in accordance with JIS-K-7210 of 2 g / 10 min or more and 100 g / 10 min or less is 15% by weight or more and 40% by weight or less, An ethylene-α-olefin copolymer (B-2) having a melt flow rate measured at 190 °C under a load of 2.16 kgf in accordance with JIS-K-7210 of 1 g / 10 min or less is 10% by weight or more and 20% by weight or less, Glass fiber (C) is 20% by weight or more and 40% by weight or less, A polypropylene-based resin composition containing 0.1% by weight or more and 5% by weight or less of an acid-modified polyolefin (D) (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

2. The polypropylene-based resin composition according to Claim 1, further comprising a lubricant (F).

3. The polypropylene-based resin composition according to Claim 2, wherein the lubricant (F) contains a fatty acid amide (F-1).

4. The polypropylene-based resin composition according to Claim 3, wherein the content of the fatty acid amide (F-1) is 0.1% by weight or more and 1.0% by weight or less (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

5. The polypropylene-based resin composition according to any one of Claims 2 to 4, wherein the lubricant (F) contains a silicone-based lubricant (F-2).

6. The polypropylene-based resin composition according to Claim 5, wherein the content of the silicone-based lubricant (F-2) is 0.5% by weight or more and 3.0% by weight or less (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

7. The polypropylene-based resin composition according to any one of Claims 1 to 6, further comprising a nucleating agent (E).

8. The polypropylene-based resin composition according to Claim 7, wherein the content of the nucleating agent (E) is 0.01% by weight or more and 0.5% by weight or less (however, the total amount of (A), (B-1), (B-2), (C) and (D) is 100% by weight).

9. A molded article comprising the polypropylene-based resin composition according to any one of Claims 1 to 8.

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