Propylene resin composition

Abstract

The present invention provides a propylene resin composition which is capable of producing a molded body that has a large tensile fracture strain.　The present invention specifically provides a propylene resin composition which contains a propylene polymer, a metal deactivator, and a hindered amine light stabilizer. The ratio of the weight of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more.

Description

Propylene resin composition

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

[0002] Molded articles containing (produced from) propylene resin compositions are used as automotive materials, home appliance materials, container and packaging materials, etc.

[0003] JP 2014-196379 A

[0004] In recent years, molded articles used in automobile materials, home appliance materials, container and packaging materials, etc., are required to have a high tensile breaking strain.

[0005] Therefore, an object of the present invention is to provide a propylene resin composition from which a molded article having a large tensile breaking strain can be produced.Another object of the present invention is to provide a molded article having a large tensile breaking strain.

[0006] The present invention relates to, but is not limited to, the following. [Invention A1] A propylene resin composition containing a propylene polymer, a metal deactivator, and a hindered amine light stabilizer, wherein the ratio by weight of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more. [Invention A2] The propylene resin composition according to Invention A1, wherein the ratio by weight of the hindered amine light stabilizer to the weight of the metal deactivator is 50 or less. [Invention A3] The propylene resin composition according to Invention A1 or A2, wherein the propylene polymer comprises a heterophasic propylene polymer material. [Invention A4] The propylene resin composition according to any one of Inventions A1 to A3, wherein the weight ratio of the metal deactivator is 10 ppm by weight to 1,000 ppm by weight, relative to 100 parts by weight of the total weight of the propylene resin composition. [Invention A5] The propylene resin composition according to any one of Inventions A1 to A4, wherein the weight ratio of the hindered amine light stabilizer is 200 ppm by weight to 10,000 ppm by weight, relative to 100 parts by weight of the total weight of the propylene resin composition. [Invention A6] The propylene resin composition according to any one of Inventions A1 to A5, wherein the weight ratio of the propylene polymer is 50 parts by weight or more, relative to 100 parts by weight of the total weight of the propylene resin composition. [Invention A7] The propylene resin composition according to any one of Inventions A1 to A6, wherein the melt flow rate (measured under conditions of a temperature of 230°C and a load of 2.16 kgf) of the propylene resin composition is 0.1 g / 10 min or more. [Invention A8] The propylene resin composition according to any one of Inventions A1 to A7, wherein the melt flow rate (measured under conditions of a temperature of 230°C and a load of 2.16 kgf) of the propylene polymer is 0.1 g / 10 min or more. [Invention A9] The propylene resin composition according to any one of Inventions A1 to A8, further comprising an ethylene-α-olefin copolymer. [Invention A10] The propylene resin composition according to Invention A9, wherein the weight ratio of the ethylene-α-olefin copolymer is 1 part by weight to 40 parts by weight per 100 parts by weight of the total weight of the propylene resin composition. [Invention A11] The propylene resin composition according to any one of Inventions A1 to A10, further comprising an inorganic filler.[Invention A12] The propylene resin composition according to Invention A11, wherein the weight ratio of the inorganic filler is 1 part by weight to 40 parts by weight per 100 parts by weight of the total weight of the propylene resin composition. [Invention A13] The propylene resin composition according to any one of Inventions A1 to A12, further comprising an ethylene-α-olefin copolymer and an inorganic filler. [Invention A14] A molded article comprising the propylene resin composition according to any one of Inventions A1 to A13.

[0007] Other aspects of the present invention are described below. [Invention B1] A propylene resin composition containing a propylene polymer, a metal deactivator having a triazole skeleton or a triazine skeleton, and a hindered amine light stabilizer having a 2,2,6,6-tetramethylpiperidine skeleton, wherein the propylene polymer is a heterophasic propylene polymer material, the weight ratio of the metal deactivator is 10 ppm by weight to 1,000 ppm by weight and the weight ratio of the hindered amine light stabilizer is 200 ppm by weight to 10,000 ppm by weight, relative to 100 parts by mass of the propylene polymer, and the weight ratio of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more. [Invention B2] The propylene resin composition according to Invention B1, wherein the weight ratio of the hindered amine light stabilizer to the weight of the metal deactivator is 50 or less. [Invention B3] The propylene resin composition according to Invention B1 or B2, wherein the weight ratio of the propylene polymer is 50 parts by weight or more per 100 parts by weight of the total weight of the propylene resin composition. [Invention B4] The propylene resin composition according to any one of Inventions B1 to B3, wherein the propylene resin composition has a melt flow rate (measured at a temperature of 230°C and a load of 2.16 kgf) of 0.1 g / 10 min or more. [Invention B5] The propylene resin composition according to any one of Inventions B1 to B4, wherein the propylene polymer has a melt flow rate (measured at a temperature of 230°C and a load of 2.16 kgf) of 0.1 g / 10 min or more. [Invention B6] The propylene resin composition according to any one of Inventions B1 to B5, further comprising an ethylene-α-olefin copolymer. [Invention B7] The propylene resin composition according to Invention B6, wherein the weight ratio of the ethylene-α-olefin copolymer is 1 to 40 parts by weight per 100 parts by weight of the total weight of the propylene resin composition. [Invention B8] The propylene resin composition according to any one of Inventions B1 to B7, further comprising an inorganic filler. [Invention B9] The propylene resin composition according to Invention B8, wherein the weight ratio of the inorganic filler is 1 to 40 parts by weight per 100 parts by weight of the total weight of the propylene resin composition.[Invention B10] The propylene resin composition according to any one of Inventions B1 to B9, further comprising an ethylene-α-olefin copolymer and an inorganic filler. [Invention B11] A molded article comprising the propylene resin composition according to any one of Inventions B1 to B10.

[0008] According to the present invention, it is possible to provide a molded article having a large tensile breaking strain and a propylene resin composition which is a raw material thereof.

[0009] Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the specific embodiments shown below.

[0010] Explanation of Terms Before describing the embodiments of the present invention, commonly used terms will be explained.

[0011] In this specification, the term "monomer unit" refers to a structural unit (residue) derived from a monomer contained in a polymer obtained by polymerizing a monomer.

[0012] As used herein, the term "α-olefin" refers to an olefin containing a carbon atom chain of three or more carbon atoms having a terminal (α-position) carbon-carbon double bond.

[0013] In this specification, the "intrinsic viscosity (unit: dL / g)" (also referred to as [η]) is a value measured at a temperature of 135°C using tetralin as a solvent by the following method.

[0014] Specifically, the intrinsic viscosity can be determined by an "extrapolation method" in which reduced viscosities are measured at multiple concentrations using an Ubbelohde viscometer, the reduced viscosities are plotted against the concentrations, and the concentration is extrapolated to zero. For example, the measurement is performed according to the method described in the Examples.

[0015] In this specification, "melt flow rate (MFR)" means "melt mass flow rate" and is a melt flow rate measured in accordance with JIS K7210-1:2014 and K7210-2:2014 under conditions of a temperature of 230°C and a load of 2.16 kgf.

[0016] In this specification, unless otherwise specified, "%" means "% by weight" and "parts" means "parts by weight".

[0017] The expression "lower limit to upper limit" expressing a numerical range means "greater than or equal to the lower limit, less than or equal to the upper limit," and the expression "upper limit to lower limit" means "less than or equal to the upper limit, greater than or equal to the lower limit." In other words, these expressions express a numerical range including the lower limit and the upper limit, but in one aspect, one or both of the upper limit and the lower limit may be excluded, that is, "lower limit to upper limit" may express "more than the lower limit and less than the upper limit," "more than or equal to the lower limit and less than the upper limit," or "more than the lower limit and less than the upper limit." Similarly, "greater than or equal to xxx" may express "more than xxx," and "less than xxx" may express "less than xxx."

[0018] Propylene Resin Composition The propylene resin composition according to the present invention is a propylene resin composition containing a propylene polymer, a metal deactivator, and a hindered amine light stabilizer, wherein the ratio by weight of the hindered amine light stabilizer to the weight of the metal deactivator is not less than 10. In one embodiment, the weight ratio of the metal deactivator is 10 parts by weight to 1,000 ppm by weight per 100 parts by weight of the total weight of the propylene resin composition.

[0019] Components that may be contained in the propylene resin composition of the present embodiment will be described below.

[0020] Propylene-Based Polymer (P) In this specification, a propylene-based polymer (also referred to as component P) is a polymer containing propylene units in an amount of more than 50% by weight based on the total amount of structural units (100% by weight). The amount of propylene units in the propylene-based polymer is usually 100% by weight or less.

[0021] Examples of propylene-based polymers include propylene homopolymers and propylene-based copolymers (copolymers obtained by polymerizing propylene and one or more other monomers copolymerizable with propylene in any combination in any ratio).

[0022] Propylene Homopolymer The intrinsic viscosity [η] of the propylene homopolymer is preferably 0.1 dL / g to 5 dL / g, more preferably 0.5 dL / g to 4 dL / g, and even more preferably 0.6 dL / g to 3 dL / g, from the viewpoint of improving the fluidity of the propylene resin composition when melted and the toughness of a molded article obtained by molding the propylene resin composition.

[0023] Propylene-based copolymer The propylene-based copolymer may be a random copolymer or a block copolymer. Examples of other monomers copolymerizable with propylene include olefins other than propylene (e.g., ethylene, olefins having 4 or more carbon atoms). The number of carbon atoms of the olefin may be 12 or less.

[0024] The olefin having 4 or more carbon atoms may be a linear olefin or a branched olefin. The olefin having 4 or more carbon atoms may be an olefin having a cyclic structure, such as an α-olefin having a cyclic structure such as vinylcyclopropane or vinylcyclobutane.

[0025] Examples of olefins other than propylene that can be copolymerized with propylene include α-olefins other than propylene (e.g., ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene). The olefins other than propylene that can be copolymerized with propylene are preferably ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene, and more preferably ethylene, 1-butene, 1-hexene, and 1-octene.

[0026] Propylene-Based Random Copolymer Examples of propylene-based random copolymers include a random copolymer containing propylene units and ethylene units (hereinafter also referred to as random polymer (1)); a random copolymer containing propylene units and α-olefin units having 4 or more carbon atoms (hereinafter also referred to as random polymer (2)); and a random copolymer containing propylene units, ethylene units, and α-olefin units having 4 or more carbon atoms (hereinafter also referred to as random polymer (3)).

[0027] The α-olefin having 4 or more carbon atoms that can constitute the propylene-based random copolymer is preferably an α-olefin having 4 to 10 carbon atoms. Examples of the α-olefin having 4 to 10 carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene, and 1-butene, 1-hexene, and 1-octene are preferred.

[0028] Examples of the random copolymer (2) include propylene-1-butene random copolymer, propylene-1-hexene random copolymer, propylene-1-octene random copolymer, and propylene-1-decene random copolymer.

[0029] Examples of the random copolymer (3) include propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer, and propylene-ethylene-1-decene copolymer.

[0030] The content of ethylene units in the random copolymer (1) is preferably 0.1 to 40% by weight.

[0031] The content of α-olefin units having 4 or more carbon atoms in the random copolymer (2) is preferably 0.1% by weight to 40% by weight, more preferably 0.1% by weight to 30% by weight, and even more preferably 2% by weight to 15% by weight.

[0032] The total content of ethylene units and α-olefin units having 4 or more carbon atoms in the random copolymer (3) is preferably 0.1% by weight to 40% by weight, more preferably 0.1% by weight to 30% by weight, and even more preferably 2% by weight to 15% by weight.

[0033] The content of propylene units in each of these random copolymers (1) to (3) is preferably 60% by weight to 99.9% by weight.

[0034] The propylene polymer (P) can be produced, for example, by the following polymerization method using a polymerization catalyst.

[0035] Examples of polymerization catalysts include Ziegler-type catalyst systems; Ziegler-Natta-type catalyst systems; catalyst systems containing a Group 4 transition metal compound having a cyclopentadienyl ring and an alkylaluminoxane; catalyst systems containing a Group 4 transition metal compound having a cyclopentadienyl ring, a compound that reacts with the metal compound to form an ionic complex, and an organoaluminum compound; and catalyst systems in which catalyst components (e.g., a Group 4 transition metal compound having a cyclopentadienyl ring, a compound that forms an ionic complex, an organoaluminum compound, etc.) are supported on inorganic particles (e.g., silica, clay minerals, etc.) and modified. Prepolymerization catalysts prepared by prepolymerizing monomers such as ethylene and α-olefins in the presence of such catalyst systems may also be used. Examples of Ziegler-Natta-type catalyst systems include catalyst systems that use a combination of a titanium-containing solid transition metal component and an organometallic component.

[0036] Examples of such catalyst systems include those described in JP-A-61-218606, JP-A-5-194685, JP-A-7-216017, JP-A-9-316147, and JP-A-10-212319, and an example of a catalyst system used to produce a heterophasic propylene polymer material described later is the catalyst system described in JP-A-2004-182981.

[0037] Examples of polymerization methods include bulk polymerization, solution polymerization, and gas-phase polymerization. Here, bulk polymerization refers to a method in which polymerization is carried out using an olefin that is liquid at the polymerization temperature as a medium. Solution polymerization refers to a method in which polymerization is carried out in an inert hydrocarbon solvent such as propane, butane, isobutane, pentane, hexane, heptane, or octane. Gas-phase polymerization refers to a method in which gaseous monomers are used as a medium and the gaseous monomers are polymerized in that medium.

[0038] Examples of the polymerization method include a batch system, a continuous system, and a combination thereof. The polymerization method may be a multi-stage system using a plurality of polymerization reactors connected in series.

[0039] Various conditions in the polymerization method (polymerization temperature, polymerization pressure, monomer concentration, catalyst input amount, polymerization time, etc.) can be appropriately determined depending on the desired propylene-based polymer.

[0040] In the production of a propylene polymer, the resulting propylene polymer may be maintained at a temperature at which impurities such as residual solvent and oligomers can volatilize and which is lower than the temperature at which the propylene polymer melts, thereby removing residual solvent contained in the resulting propylene polymer and ultralow molecular weight oligomers by-produced during the production. Examples of methods for removing impurities such as residual solvent and oligomers include the methods described in JP-A-55-75410 and JP-A-2565753.

[0041] The propylene resin composition of the present embodiment may contain two or more types of propylene polymers as the propylene polymer (P).

[0042] Examples of combinations containing two or more propylene polymers include a combination of two or more propylene homopolymers differing in weight average molecular weight, and a heterophasic propylene polymer material.

[0043] Here, the term "heterophasic propylene polymer material" refers to a material containing two or more types of propylene polymers, in which the two or more types of propylene polymers are not compatible with each other and form separate phases.

[0044] Examples of heterophasic propylene polymer materials include materials containing a combination of polymer (I) and polymer (II) below.

[0045] Here, polymer (I) is a polymer having propylene units in an amount of more than 80% by weight and not more than 100% by weight based on the amount of all constituent units. Polymer (I) may be a propylene homopolymer or a copolymer of propylene and other monomers. The total content of monomer units other than propylene units in polymer (I) is usually 0% by weight or more and less than 20% by weight, and may be 0% by weight or more, or may be 0.01% by weight or more, when the weight of polymer (I) is taken as 100% by weight. When polymer (I) is a copolymer, polymer (I) may be a random copolymer.

[0046] Examples of monomer units other than propylene units that may be contained in the polymer (I) include ethylene units and α-olefin units having 4 or more carbon atoms.

[0047] The α-olefin having 4 or more carbon atoms that can constitute the polymer (I) is preferably an α-olefin having 4 to 10 carbon atoms, more preferably 1-butene, 1-hexene, and 1-octene, and even more preferably 1-butene.

[0048] Examples of the polymer (I) include propylene homopolymer, propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, and propylene-ethylene-1-octene copolymer.

[0049] Among these, as the polymer (I), a propylene homopolymer, a propylene-ethylene copolymer, a propylene-1-butene copolymer, and a propylene-ethylene-1-butene copolymer are preferred, and from the viewpoint of improving the rigidity of a molded article obtained by molding the propylene resin composition, a propylene homopolymer is more preferred.

[0050] Furthermore, polymer (II) is a copolymer of propylene units and at least one monomer unit selected from the group consisting of ethylene units and α-olefin units having 4 or more carbon atoms. Polymer (II) is preferably a polymer containing propylene units in an amount of more than 0% by weight and not more than 90% by weight, more preferably more than 0% by weight and not more than 80% by weight, based on the amount of all constituent units. Polymer (II) may be a random copolymer or a block copolymer.

[0051] The total content of ethylene units and α-olefin units having 4 or more carbon atoms in polymer (II) is preferably 20% by weight to 80% by weight, and more preferably 20% by weight to 60% by weight, based on 100% by weight of polymer (II).

[0052] The α-olefin having 4 or more carbon atoms that can constitute polymer (II) is preferably an α-olefin having 4 to 10 carbon atoms, and examples thereof include the same as the examples of α-olefins that can constitute polymer (I) already described above.

[0053] Examples of polymer (II) include propylene-ethylene copolymer, propylene-ethylene-1-butene copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer, propylene-ethylene-1-decene copolymer, propylene-1-butene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, and propylene-1-decene copolymer. Polymer (II) is preferably a propylene-ethylene copolymer, a propylene-1-butene copolymer, or a propylene-ethylene-1-butene copolymer, and more preferably a propylene-ethylene copolymer.

[0054] The content of polymer (II) in the heterophasic propylene polymer material is preferably 1 to 50% by weight, more preferably 1 to 45% by weight, even more preferably 5 to 40% by weight, and particularly preferably 7 to 35% by weight, when the total weight of polymer (I) and polymer (II) is taken as 100% by weight.

[0055] The polymer (I) and the polymer (II) may each consist of only one type of polymer, or may contain two or more types of polymers.

[0056] Examples of heterophasic propylene polymer materials include those in which polymer (I) is a propylene homopolymer, a combination of a propylene homopolymer and a (propylene-ethylene) copolymer, a combination of a propylene homopolymer and a (propylene-ethylene-1-butene) copolymer, a combination of a propylene homopolymer and a (propylene-ethylene-1-hexene) copolymer, a combination of a propylene homopolymer and a (propylene-ethylene-1-octene) copolymer, a combination of a propylene homopolymer and a (propylene-1-butene) copolymer, a combination of a propylene homopolymer and a (propylene-1-hexene) copolymer, a combination of a propylene homopolymer and a (propylene-1-octene) copolymer, and a combination of a propylene homopolymer and a (propylene-1-decene) copolymer.

[0057] The heterophasic propylene polymer material may also be a combination in which the polymer (I) is a polymer containing propylene units and monomer units other than propylene units. If the type of polymer (I) is listed first and the type of polymer (II) is listed second, specific examples of such heterophasic propylene polymer materials include a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene-1-butene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene-1-hexene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene-1-octene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene-1-decene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-butene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-hexene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-octene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-octene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-hexene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-1-octene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene ... a combination of a (propylene-1-decene) copolymer and a (propylene-1-decene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-ethylene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-ethylene-1-butene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-ethylene-1-hexene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-ethylene-1-octene) copolymer, a combination of a (propylene-ethylene-1-butene) copolymer and a (propylene-ethylene-1-decene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-1-butene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-1-hexene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-1-octene) copolymer, a combination of a (propylene-1-butene) copolymer and a (propylene-1-decene) copolymer,Examples of the copolymer include a combination of a (propylene-1-hexene) copolymer and a (propylene-1-hexene) copolymer, a combination of a (propylene-1-hexene) copolymer and a (propylene-1-octene) copolymer, a combination of a (propylene-1-hexene) copolymer and a (propylene-1-decene) copolymer, a combination of a (propylene-1-octene) copolymer and a (propylene-1-octene) copolymer, and a combination of a (propylene-1-octene) copolymer and a (propylene-1-decene) copolymer.

[0058] Preferred heterophasic propylene polymer materials that can be contained in the propylene resin composition of the present embodiment include a combination of a propylene homopolymer and a (propylene-ethylene) copolymer, a combination of a propylene homopolymer and a (propylene-ethylene-1-butene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene) copolymer, a combination of a (propylene-ethylene) copolymer and a (propylene-ethylene-1-butene) copolymer, and a combination of a (propylene-1-butene) copolymer and a (propylene-1-butene) copolymer, and a combination of a propylene homopolymer and a (propylene-ethylene) copolymer is more preferred.

[0059] The heterophasic propylene polymer material can be produced by multi-stage polymerization comprising a first polymerization step of producing polymer (I) and a second polymerization step of further producing polymer (II) in the presence of polymer (I) produced in the first step. The polymerization can be carried out using a catalyst system exemplified as a catalyst system usable for producing the propylene polymer.

[0060] The propylene polymer (P) preferably contains at least one selected from the group consisting of propylene homopolymers and heterophasic propylene polymer materials, and more preferably a heterophasic propylene polymer material.

[0061] The propylene polymer (P) is １３The isotactic pentad fraction (also referred to as the [mmmm] fraction) measured by C-NMR is preferably 0.97 or more, more preferably 0.98 or more. The closer the isotactic pentad fraction of the propylene polymer is to 1, the higher the stereoregularity of the molecular structure of the propylene polymer and the higher the crystallinity of the propylene polymer. When the propylene polymer is a copolymer, the isotactic pentad fraction can be measured for the chain of propylene units in the copolymer.

[0062] The melt flow rate (MFR) of the propylene polymer (P), measured under conditions of a temperature of 230°C and a load of 2.16 kgf, is preferably 0.1 g / 10 min or more, more preferably 0.5 g / 10 min or more, and is preferably 500 g / 10 min or less, more preferably 400 g / 10 min or less, and is preferably 0.1 g / 10 min to 500 g / 10 min, from the viewpoint of improving the processability in molding of the propylene resin composition.

[0063] From the viewpoint of improving the fluidity and processability of the propylene resin composition, the intrinsic viscosity of the propylene polymer (P) of the present embodiment is usually less than 5 dL / g, 0.1 dL / g or more, preferably 0.5 dL / g or more, more preferably 0.7 dL / g or more and less than 4 dL / g, and even more preferably 0.8 dL / g or more and less than 3 dL / g.

[0064] In the present embodiment, the polystyrene-equivalent weight average molecular weight of the propylene polymer (P) is usually 100,000 to 1,000,000, and preferably 500,000 to 1,000,000, from the viewpoint of improving the appearance and elongation properties of the molded article.

[0065] The molecular weight distribution (Mw / Mn) of the propylene polymer (P) may be usually 10 or less, preferably 3 to 8, from the viewpoint of improving moldability and mechanical properties.

[0066] In the present specification, Mw represents weight-average molecular weight, Mn represents number-average molecular weight, and the molecular weight distribution can be measured by gel permeation chromatography (GPC) under the following conditions: Apparatus: HLC-8121 GPC / HT manufactured by Tosoh Corporation Separation column: Three GMHHR-H(S)HT manufactured by Tosoh Corporation Measurement temperature: 140°C Carrier: orthodichlorobenzene Flow rate: 1.0 mL / min Sample concentration: Approximately 1 mg / mL Sample injection amount: 400 μL Detector: Differential refractometry Calibration curve creation method: Standard polystyrene used for conversion

[0067] When the propylene polymer is a heterophasic propylene polymer material essentially composed of polymer (I) and polymer (II) formed by multistage polymerization, a portion of polymer (I) prepared in the first polymerization stage is extracted from the polymerization reactor, and its intrinsic viscosity (also referred to as [η]I) is determined. The intrinsic viscosity (also referred to as [η]Total) of the polymer finally obtained by the multistage polymerization is determined, and the intrinsic viscosity (also referred to as [η]II) of polymer (II) formed in the second polymerization stage can be calculated using these intrinsic viscosity values ​​and the content ratio of each polymer. The calculation procedure is as follows. XI and XII can be determined from the material balance during polymerization. [η]II = ([η]Total - [η]I × XI) / XII [η]Total: intrinsic viscosity of the final polymer (unit: dL / g) [η]I: intrinsic viscosity of polymer (I) (unit: dL / g) XI: weight ratio of polymer (I) to the final polymer XII: weight ratio of polymer (II) to the final polymer

[0068] The intrinsic viscosity [η]I of the polymer (I) is preferably 0.1 dL / g to 5 dL / g, more preferably 0.5 dL / g to 4 dL / g, and even more preferably 0.6 dL / g to 3 dL / g.

[0069] The intrinsic viscosity [η]II of the polymer (II) is preferably 1 dL / g to 10 dL / g, more preferably 1.5 dL / g to 9 dL / g, and even more preferably 2 dL / g to 8 dL / g.

[0070] The ratio of [η]II to [η]I ([η]II / [η]I) is preferably 1-20, more preferably 1-10.

[0071] The weight ratio XII of polymer (II) to the final polymer may be calculated from the following formula using the respective heats of crystalline fusion of polymer (I) and the final polymer: XII=1-(ΔHf)Total / (ΔHf)I, where (ΔHf)Total is the heat of fusion of the final polymer (polymer (I) and polymer (II)) (unit: cal / g), and (ΔHf)I is the heat of fusion of polymer (I) (unit: cal / g).

[0072] The molecular weight distribution (Mw / Mn) of the polymer (I) is preferably 1 or more and less than 10, more preferably 2 or more and less than 7, and even more preferably 3 or more and less than 5.

[0073] Metal Deactivator The propylene resin composition of the present invention contains a metal deactivator (also referred to as component D). A metal deactivator is a compound that has the function of chelating metal ions and prevents the progression of thermal oxidative degradation of polymeric materials caused by metals in environments where the polymeric materials come into contact with metals. Known metal deactivators can be used as component D. Examples include benzotriazole derivatives, compounds having one or more groups represented by —CO—NH— (e.g., oxalic acid derivatives, salicylic acid derivatives, hydrazide derivatives, hydroxybenzoic acid anilide derivatives), and sulfur-containing phosphites, as disclosed in “New Developments in Polymer Additives” (Nikkan Kogyo Shimbun, pp. 76-85) or JP-A-8-302331. These metal deactivators can be used alone or in combination of two or more. Although overlapping with the above, other examples include compounds containing a nitrogen-containing heteromonocyclic ring in the molecule, compounds containing a nitrogen-containing condensed heterocyclic ring in the molecule, compounds containing a phenolic hydroxyl group in the molecule, compounds containing a salicylic group in the molecule, hydrazones and bishydrazones of aliphatic and aromatic aldehydes, hydrazides of aliphatic and aromatic mono- and dicarboxylic acids, and bisacylated hydrazine derivatives.

[0074] Metal deactivators having a triazole or triazine skeleton are preferred.

[0075] Specific preferred examples of the metal deactivator include unsubstituted or alkyl-substituted benzotriazole, 2,4,6-triamino-1,3,5-triazine, 3,9-bis[2-(3,5-diamino-2,4,6-triazaphenyl)ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, ethylenediamine-tetraacetic acid, alkali metal salts of ethylenediamine-tetraacetic acid (Li, Na, K), N,N'-disalicylidene-ethylenediamine, ... N,N''-disalicylidene-1,2-propylenediamine, N,N''-disalicylidene-N'-methyl-dipropylenetriamine, 3-(N-salicyloyl)amino-1,2,4-triazole (ADEKA STAB CDA-1M), decamethylenedicarboxylic acid-bis(N'-salicyloylhydrazide), nickel-bis(1-phenyl-3-methyl-4-decanoyl-5-pyrazolate), 2-ethoxy-2'-ethyloxanilide, 5-t-butyl-2-ethoxy-2'-ethyloxanilide, N,N- Diethyl-N',N'-diphenyloxamide, N,N'-diethyl-N,N'-diphenyloxamide, oxalic acid-bis(benzylidenehydrazide), thiodipropionic acid-bis(benzylidenehydrazide), isophthalic acid-bis(2-phenoxypropionylhydrazide), bis(salicylidenehydrazine), N-salicylidene-N'-salicylidenehydrazone, 2',3-bis[[3-[3,5-di-t-butyl-4-hydroxyphenyl]propionyl]]propionyl propionohydrazide, trimethyl phosphate, tris[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butyl)phenyl-5-methyl]-phenyl phosphite, bis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-pentaerythritol-diphosphite, tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-1,6-Hexamethylene-bis(N-hydroxyethyl-N-methylsemicarbazide)-diphosphite, tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-1,10-decamethylene-di-carboxylic acid-di-hydroxyethylcarbonylhydrazide-diphosphite, tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-1,10-decamethylene-di-carboxylic acid-di-salicyloylhydrazide-diphosphite, tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-1,10-decamethylene-di-carboxylic acid-di-salicyloylhydrazide-diphosphite Examples of suitable hydroxybenzoates include tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-N,N'-bis(hydroxyethyl)oxamide diphosphite, tetrakis[2-t-butyl-4-thio(2'-methyl-4'-hydroxy-5'-t-butylphenyl)-5-methylphenyl]-N,N'-bis(hydroxyethyl)oxamide diphosphite, 2,2'-oxamide bis[ethyl 3-(3,5-t-butyl-4-hydroxyphenyl)propionate], N'1,N'12-bis(2-hydroxybenzoyl)dodecane dihydrazide, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-N'-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide, and melamine.

[0076] More preferred examples include 3-(N-salicyloyl)amino-1,2,4-triazole, trimethyl phosphate, N′1,N′12-bis(2-hydroxybenzoyl)dodecane dihydrazide, melamine, and 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-N′-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide.

[0077] Hindered Amine Light Stabilizer (H) The propylene resin composition of the present invention contains a hindered amine stabilizer (also referred to as component H). The hindered amine stabilizer is a compound having a 2,2,6,6-tetramethylpiperidine skeleton in the molecule, and is a light stabilizer that plays a role in capturing radicals generated by light (ultraviolet rays) in organic materials, polymeric materials, etc., and in preventing deterioration of organic materials and polymeric materials due to decomposition of hydroperoxides. Examples include low-molecular-weight and high-molecular-weight light stabilizers. Furthermore, the hindered amine light stabilizer (H) may be used alone or in combination of two or more types.

[0078] The low molecular weight light stabilizer is a light stabilizer having a molecular weight of less than 1000, and examples thereof include bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate (trade name: Tinuvin 770, molecular weight: 480), bis(N-methyl-2,2,6,6-tetramethyl-4-piperidyl)sebacate (trade name: Tinuvin 765, molecular weight: 508), tetrakis(2,2,6,6-tetra-methyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate (trade name: A Decastab LA-57, molecular weight: 792), tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate (trade name: Adekastab LA-52, molecular weight: 847), decanedioic acid bis(2,2,6,6-tetramethyl-1(octyloxy)-4-piperidyl) ester and a reaction product of 1,1-dimethylethyl hydroperoxide with octane (trade name: TINUVIN 123, molecular weight: 737), and the like.

[0079] The high molecular weight light stabilizer is a light stabilizer having a molecular weight of 1000 or more, and examples thereof include sterically hindered amine oligomers such as "N-(2,2,6,Copolymer of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)maleimide and α-olefin (C20-24) (trade name: UVINUL [registered trademark] 5050H, molecular weight: 3500), formaldehyde polycondensate, reaction product of {2,4,6-trichloro-1,3,5-triazine / [N,N'-bis(2,2,6,6-tetramethylpiperidin-4-yl)hexane-1,6-diyldiamine] / morpholine polymer} and formic acid (trade name: Cyasorb UV-3529, molecular weight: approximately 1700), copolymer of N,N'-bis(2,2,6,6-tetramethylpiperidin-4-yl)maleimide and α-olefin (C20-24) (trade name: UVINUL [registered trademark] 5050H, molecular weight: 3500), Polycondensation product of 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 (molecular weight: 2286, 90%), dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol (trade name: TINUVIN 622LD, molecular weight: about 3100-4000). 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 (ADK STAB LA-63, molecular weight: approximately 2000), poly[{(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl){(2,2,6,6-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl] (trade name: CHIMASORB119FL), 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 (ADK STAB LA-63, molecular weight: approximately 2000), poly[{(6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl){(2,2,6,6-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl}-1,2,3,4 butanetetracarboxylate] (ADK STAB LA-63, molecular weight: approximately 2000), methyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino}} (trade name: CHIMASORB 944LD, molecular weight 2000 to 3100), 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 (trade name: CHIMASORB 2020FDL, molecular weight: approximately 2600 to 3400)).

[0080] Ethylene-α-olefin copolymer (E) The propylene resin composition of the present embodiment may contain an ethylene-α-olefin copolymer (also referred to as component E 1 ).

[0081] In the ethylene-α-olefin copolymer (E), when the total weight of the ethylene-α-olefin copolymer is taken as 100% by weight, the sum of the content of monomer units derived from ethylene and the content of monomer units derived from an α-olefin having 4 or more carbon atoms may be 100% by weight.

[0082] 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 the α-olefins having 4 or more carbon atoms, 1-butene, 1-hexene, and 1-octene are preferred. The α-olefin may be an α-olefin having a cyclic structure, such as vinylcyclopropane or vinylcyclobutane.

[0083] Examples of the ethylene-α-olefin copolymer (E) include 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.

[0084] In the ethylene-α-olefin copolymer (E), the content of the monomer units derived from an α-olefin having 4 or more carbon atoms is preferably 1 to 49% by weight, more preferably 5 to 49% by weight, and even more preferably 24 to 49% by weight, based on the total weight of the ethylene-α-olefin copolymer (100% by weight).

[0085] The ethylene-α-olefin copolymer (E) preferably has an MFR (measured at 190°C under a load of 2.16 kgf) of 0.1 g / 10 min or more and 100 g / 10 min or less, more preferably 0.5 g / 10 min or more and 70 g / 10 min or less.

[0086] The density of the ethylene-α-olefin copolymer (E) is set to 0.850 g / cm from the viewpoint of improving the impact resistance of the molded article. ３ ~0.890g / cm ３ and preferably 0.850 g / cm ３ ~0.880g / cm ３ More preferably, it is 0.855 g / cm ３ ~0.870g / cm ３ It is more preferable that:

[0087] The ethylene-α-olefin copolymer (E) can be produced by polymerizing ethylene and an α-olefin having 4 or more carbon atoms using a polymerization catalyst.

[0088] Examples of the polymerization catalyst used for the production include homogeneous catalysts such as metallocene catalysts, and Ziegler-Natta catalysts.

[0089] Examples of homogeneous catalysts include catalysts consisting essentially of a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring and an alkylaluminoxane; catalysts containing a compound of a transition metal of Group 4 of the periodic table having a cyclopentadienyl ring, a compound that forms an ionic complex upon reaction with the transition metal compound, 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 mineral, etc.).

[0090] Examples of Ziegler-Natta catalysts include catalysts that combine a titanium-containing solid transition metal component with an organometallic component.

[0091] The ethylene-α-olefin copolymer (E) may be a commercially available product. Examples of commercially available ethylene-α-olefin copolymer (E) 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), SUMIKACENE (registered trademark), and ESPRENE SPO (registered trademark) manufactured by Sumitomo Chemical Co., Ltd.

[0092] Inorganic Filler (F) The propylene resin composition according to this embodiment may further contain an inorganic filler (also referred to as component F) from the viewpoint of improving mechanical properties, dimensional stability, and the like.

[0093] Examples of the inorganic filler (F) include (i) a fibrous inorganic filler and (ii) a non-fibrous inorganic filler. In this embodiment, two or more types of inorganic fillers (F) may be used in combination. This will be specifically described below.

[0094] (i) Fibrous Inorganic Filler In the present embodiment, the fibrous inorganic filler preferably has an average fiber diameter of 0.2 μm to 20 μm, an average fiber length of 5 μm to 200 μm, and an aspect ratio of 10 to 30. From the viewpoint of improving the rigidity of the molded body and improving the appearance of the molded body, it is more preferable that the average fiber diameter is 0.3 μm to 10 μm, the average fiber length is 7 μm to 150 μm, and the aspect ratio is 12 to 25.

[0095] The average fiber diameter and average fiber length of the fibrous inorganic filler are, for example, the average values ​​of the fiber diameter and fiber length measured by randomly selecting 50 or more fibers from an image of the fibrous inorganic filler obtained by an electron microscope, and the aspect ratio can be calculated using these average values.

[0096] Examples of fibrous inorganic fillers include fibrous magnesium oxysulfate, potassium titanate fiber, magnesium hydroxide fiber, aluminum borate fiber, calcium silicate fiber, calcium carbonate fiber, carbon fiber, glass fiber, and metal fiber. Of these, fibrous magnesium oxysulfate and calcium silicate fiber are preferred.

[0097] The fibrous inorganic filler can be used as it is. From the viewpoint of improving the interfacial adhesion and further improving the dispersibility, the fibrous inorganic filler may be further surface-treated with, for example, a silane coupling agent or a metal salt of a higher fatty acid before use.

[0098] Examples of higher fatty acid metal salts that can be used for the surface treatment include calcium stearate, magnesium stearate, and zinc stearate.

[0099] In this embodiment, examples of the form of the fibrous inorganic filler include powder, flake, and granule. In this embodiment, any of the above-mentioned forms of the fibrous inorganic filler may be used. Because of its good handleability, it is preferable to use a fibrous inorganic filler in the form of granules.

[0100] (ii) Non-fibrous inorganic filler Examples of non-fibrous inorganic fillers include talc, mica, calcium carbonate, barium sulfate, magnesium carbonate, clay, alumina, calcium sulfate, silica sand, carbon black, titanium oxide, magnesium hydroxide, molybdenum, diatomaceous earth, sericite, shirasu, calcium hydroxide, calcium sulfite, sodium sulfate, bentonite, graphite, etc. From the viewpoints of improving the impact strength and improving the appearance of the molded body, it is preferable to use talc.

[0101] The average particle size of the non-fibrous inorganic filler is preferably 15 μm or less, more preferably 10 μm or less. Here, the average particle size of the non-fibrous inorganic filler is determined based on volume-based particle size distribution measurement data measured by laser diffraction according to the method specified in JIS R1629, and means the particle size when the cumulative number of particles from the smallest particle size reaches 50% (50% equivalent particle size) in the particle size distribution measurement data. The particle size defined in this way is generally referred to as "50% equivalent particle size" and is expressed as "D50".

[0102] The non-fibrous inorganic filler can be used as it is. From the viewpoint of improving interfacial adhesion and dispersibility, the non-fibrous inorganic filler may be surface-treated with a silane coupling agent, a titanium coupling agent, or a surfactant before use.

[0103] Examples of surfactants that can be used for the surface treatment include higher fatty acids, higher fatty acid esters, higher fatty acid amides, and higher fatty acid salts.

[0104] The fibrous inorganic filler may be used as it is, or may be surface-treated with a silane coupling agent or a metal salt of a higher fatty acid in order to improve interfacial adhesion and dispersibility.

[0105] Other Additives (A) In order to improve properties—for example, to improve rigidity, impact resistance, heat aging resistance, or water resistance, and / or to increase the tensile breaking strain—the propylene resin composition of the present embodiment may contain, in addition to the components already described above, various other additives (also referred to as component A) as further optional components.

[0106] Examples of such optional additives include antioxidants, neutralizing agents, ultraviolet absorbers, lubricants, antistatic agents, colorants (e.g., inorganic pigments, organic pigments), flame retardants, elastomers, antiblocking agents, processing aids, organic peroxides, pigment dispersants, foaming agents, foam nucleating agents, plasticizers, crosslinking agents, crosslinking aids, brightness enhancers, antibacterial agents, light diffusing agents, and molecular weight modifiers.

[0107] The propylene resin composition of the present embodiment may contain one kind of these additives alone, or may contain two or more kinds of optional components in any combination at any ratio.

[0108] Among them, antioxidants, neutralizing agents, ultraviolet absorbers, and colorants are preferably used as the additive (A). Specific explanations are given below. The propylene resin composition of the present embodiment preferably includes, in addition to the above components, one or more selected from the group consisting of organic peroxides, neutralizing agents, antioxidants, ultraviolet absorbers, and colorants.

[0109] Examples of the antioxidant include phenol-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, and hydroxylamine-based antioxidants, and preferably phenol-based antioxidants, phosphorus-based antioxidants, or sulfur-based antioxidants.

[0110] Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol, tetrakis[methylene-3(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate]methane (Irganox 1010), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Irganox 1076), 3,9-bis[2-{3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1,1-dimethylethyl]-2,4,8,10- ...yloxy]methane (Irganox 1010), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Irganox 1 Suspiro[5.5]undecane, 1,3,5-tris-2[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxy]ethyl isocyanate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, pentaerythrityl-tetrakis[3-(3,5-di-te tert-butyl-4-hydroxyphenyl)propionate], triethylene glycol-N-bis-3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate, 1,6-hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2-thiobis-diethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-methylene-bis-(4-methyl-6-tert-butylphenol), 2,2'-methylene-bis-(4- ethyl-6-tert-butylphenol), 2,2'-methylene-bis-(4,6-di-tert-butylphenol), 2,2'-ethylidene-bis-(4,6-di-tert-butylphenol), 2,2'-butylidene-bis-(4-methyl-6-tert-butylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenol), 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate, 2,4-di-tert-amyl-6-(1-(3,Examples of tocopherols include α-tocopherol vitamin E. Preferred are 2,6-di-tert-butyl-4-methylphenol, tetrakis[methylene-3(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate]methane (Irganox 1010), 2,6-di-tert-butyl-4-methylphenol, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Irganox 1076), 3,9-bis[2-{3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}- 1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, or vitamin E, and more preferably tetrakis[methylene-3(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate]methane (Irganox 1010), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Irganox 1076), or vitamin E.

[0111] Examples of phosphorus-based antioxidants include tris(nonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168), distearyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-di-tert-butyl-6-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-diphenylene diphosphonite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)2-ethylhexyl phosphite, 2,2'-ethylidenebis(4,6-di-tert-butylphenyl)fluorophosphite, bis (2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, 2-(2,4,6-tri-tert-butylphenyl)-5-ethyl-5-butyl-1,3,2-oxaphosphorinane, 2,2',2''-nitrilo[triethyl-tris(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2,2'-diyl)phosphite, 2,4,8,10-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxybenzoyl)methyl]- Examples of suitable hydroxybenzoates include tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168) and 2,4,8,10-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine. Preferred are tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168) and 2,4,8,10-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepine.

[0112] Examples of sulfur-based antioxidants include dilauryl 3,3'-thiodipropionate, tridecyl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, laurylstearyl 3,3'-thiodipropionate, neopentanetetrayltetrakis(3-laurylthiopropionate), and bis[2-methyl-4-(3-n-alkyl(C12-C14)thiopropionyloxy)-5-tert-butylphenyl]sulfide, and preferably dilauryl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, or distearyl 3,3'-thiodipropionate.

[0113] Hydroxylamine compounds are compounds represented by the following general formula, which form nitroxyl radicals during the degradation reaction of polymeric materials due to heat and oxygen, thereby inhibiting thermal oxidative degradation of polymeric materials.

[0114] R of the hydroxylamine-based compound represented by the above general formula ４ and R ５ is a C12-30 alkyl group, and R ４ and R ５ The alkyl group is preferably a linear alkyl group or an alkyl group substituted with a cyclic alkyl group, more preferably an alkyl group having 12 to 22 carbon atoms, and more preferably a linear saturated alkyl group having 12 to 22 carbon atoms.

[0115] Examples of the linear saturated alkyl group include a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an eicosyl group, a heneicosyl group, a docosyl group, a tricosyl group, and a tetracosyl group, and preferably a tetradecyl group, a hexadecyl group, an octadecyl group, an eicosyl group, and a docosyl group.

[0116] Preferably, at least one selected from the group consisting of phenol-based antioxidants and phosphorus-based antioxidants is used. The above-mentioned various antioxidants may be used alone or in combination of two or more.

[0117] Examples of the neutralizing agent include calcium stearate, hydrotalcite, alkaline earth metal oxides, alkaline earth metal hydroxides, etc. These neutralizing agents may be used alone or in combination of two or more.

[0118] Examples of the ultraviolet absorber include a benzotriazole-based ultraviolet absorber, a tridiamine-based ultraviolet absorber, an anilide-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, etc. These neutralizing agents may be used alone or in combination of two or more.

[0119] Examples of colorants include inorganic pigments and organic pigments. Examples of inorganic pigments include carbon black, 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 quinacridone, polyazo yellow, anthraquinone yellow, polyazo red, azo lake yellow, perylene, phthalocyanine green, phthalocyanine blue, and isoindolinone yellow.

[0120] The propylene resin composition may contain other additives such as resins and rubbers in addition to the additives already described.

[0121] Examples of other additives (A) include 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 polyphenylene sulfide resin, Examples of suitable resins include thermoplastic resins such as 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; and PLA resin (polylactic acid) produced by polymerizing plant-derived monomers extracted from biomaterials.

[0122] At least one of the various components such as the propylene polymer, ethylene-α-olefin copolymer, and inorganic filler used as raw materials in the production of the propylene resin composition may be recycled.

[0123] Content of Each Component In the propylene resin composition of the present invention, the content of each component is not particularly limited, provided that the ratio by weight of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more. The ratio is preferably 13 or more, 15 or more, 18 or more, or 20 or more. The upper limit of the ratio is not particularly limited, and may be, for example, 200 or less, 150 or less, 100 or less, or 70 or less. All combinations of "any of the above lower limits to any of the above upper limits" are considered to be specified herein.

[0124] When the weight ratio of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more, the propylene resin composition of the present invention and a molded article containing the same (produced therefrom) have a large tensile break strain and / or low mold contamination. The large tensile break strain makes the molded article less likely to crack sharply, improving safety. The tensile break strain is measured, for example, according to the method described in the Examples. The low metal contamination can reduce the number of times the mold needs to be cleaned and / or can reduce the number of molds and extend the mold's life (usage cycle), thereby reducing the burden on the environment. The mold contamination can be measured, for example, according to the method described in the Examples.

[0125] The content of the propylene polymer (P) relative to 100 parts by weight of the propylene resin composition of the present invention is preferably 50 parts by weight or more, optionally 60 parts by weight or more, 70 parts by weight or more, 80 parts by weight or more, or 90 parts by weight or more, and may be about 100 parts by weight or less, 99 parts by weight or less, 50 to 95 parts by weight, or 60 to 95 parts by weight. When the propylene resin composition of the present invention contains another polymer as Component P, the total weight content of Component P and the other polymer relative to 100 parts by weight of the propylene resin composition may be as described above. The "other polymer" is preferably an ethylene-α-olefin copolymer (E).

[0126] When the propylene resin composition of the present invention contains an ethylene-α-olefin copolymer (E), the content of the ethylene-α-olefin copolymer (E) in the propylene resin composition is typically more than 0 parts by weight and not more than 40 parts by weight, preferably 1 part by weight or more and not more than 40 parts by weight, preferably 5 parts by weight or more and not more than 35 parts by weight, and more preferably 5 parts by weight or more and not more than 30 parts by weight, relative to the weight of component P. In one embodiment, the weight ratio of component E to the weight of component P is more than 0 parts by weight and not more than 40 parts by weight, preferably 1 part by weight or more and not more than 40 parts by weight, preferably 5 parts by weight or more and not more than 35 parts by weight, and more preferably 5 parts by weight or more and not more than 30 parts by weight. The above phrase "more than 0 parts by weight" may be replaced with "0 parts by weight or more." In this specification, "0 parts by weight or more" when used to describe the content of an optional component refers to both an embodiment in which the component is included and an embodiment in which the component is not included.

[0127] The content of the metal deactivator (D) relative to 100 parts by weight of the propylene polymer (P), 100 parts by weight of the total weight of the polymer components, or 100 parts by weight of the propylene resin composition is preferably 10 ppm by weight to 1,000 ppm by weight, more preferably 50 ppm by weight to 800 ppm by weight, and even more preferably 80 ppm by weight to 500 ppm by weight. In order to exert the metal deactivation effect, the content of component D is preferably equal to or greater than the above-mentioned lower limit. Furthermore, in order to avoid adversely affecting the hue of the propylene resin composition, the content of component D is preferably equal to or less than the above-mentioned upper limit.

[0128] The content of the hindered amine light stabilizer (H) relative to 100 parts by weight of the propylene polymer (P), 100 parts by weight of the total weight of the polymer components, or 100 parts by weight of the propylene resin composition is preferably 200 ppm by weight to 10,000 ppm by weight, more preferably 500 ppm by weight to 8,000 ppm by weight, and even more preferably 1,000 ppm by weight to 5,000 ppm by weight. In order for the resin composition of the present invention to have sufficient light resistance stability, the content of component H is preferably equal to or greater than the above-mentioned lower limit. Furthermore, in order to avoid bleed-out of component H to the surface of a molded article, surface whitening, smoke generation during molding, and mold contamination, the content of component H is preferably equal to or less than the above-mentioned upper limit.

[0129] When the polypropylene resin composition of the present invention contains an inorganic filler, the content of the inorganic filler (F) relative to 100 parts by weight of the propylene polymer (P), 100 parts by weight of the total weight of the polymer components, or 100 parts by weight of the propylene resin composition is usually more than 0 part by weight and not more than 40 parts by weight, preferably 1 part by weight or more and not more than 40 parts by weight, more preferably 5 parts by weight or more and not more than 35 parts by weight, and more preferably 5 parts by weight or more and not more than 30 parts by weight. The above-mentioned "more than 0 parts by weight" may be replaced with "0 parts by weight or more".

[0130] When the polypropylene resin composition of the present invention contains an antioxidant, the content of the antioxidant relative to 100 parts by weight of the propylene polymer (P) or 100 parts by weight of the total weight of the polymer components is preferably more than 0 parts by weight and 5 parts by weight, preferably 0.001 to 5 parts by weight, more preferably 0.01 to 3 parts by weight, even more preferably 0.05 to 2 parts by weight, and even more preferably 0.1 to 1 part by weight. The above phrase "more than 0 parts by weight" may be replaced with "0 parts by weight or more." In order to improve the rigidity, impact resistance, heat aging resistance, or water resistance and / or to increase the tensile break strain, the content of the antioxidant is preferably equal to or greater than the above-mentioned lower limit. Furthermore, in order to improve the appearance of the molded article, such as hue and gloss, the content of the antioxidant is preferably equal to or less than the above-mentioned upper limit. On the other hand, in order to reduce mold staining, the content ratio of the antioxidant may be 0 to 0.05 parts by weight, 0 to 0.01 parts by weight, 0 to 0.005 parts by weight, or 0 part by weight (i.e., not included). Mold staining is measured, for example, according to the method described in the Examples. Water resistance is measured, for example, according to the method described in the Examples.

[0131] The propylene resin composition of the present embodiment can be produced by melt-kneading the components described above. The temperature during melt-kneading may be 180°C or higher, 180°C to 300°C, or 180°C to 250°C.

[0132] Examples of melt-kneading devices used in melt-kneading for producing the propylene resin composition of the present embodiment include any suitable conventionally known Banbury mixer, single-screw extruder, twin-screw co-rotating extruder, and twin-screw counter-rotating extruder.

[0133] Specific examples of the melt kneading apparatus include ZSK (registered trademark) manufactured by Coperion, TEM (registered trademark) manufactured by Shibaura Machine Co., Ltd., TEX (registered trademark) manufactured by The Japan Steel Works, Ltd., KZW (registered trademark) manufactured by Technovel Co., Ltd., CMP (registered trademark) and TEX (registered trademark) manufactured by The Japan Steel Works, Ltd., and FCM (registered trademark), NCM (registered trademark), and LCM (registered trademark) manufactured by Kobe Steel, Ltd.

[0134] The order of kneading the raw materials is not particularly limited. For example, all the raw materials may be kneaded by being charged into a production apparatus at once, or some of the selected components may be kneaded and then the resulting kneaded mixture may be kneaded with other components.

[0135] The properties of the propylene resin composition of this embodiment are not particularly limited. The propylene resin composition of this embodiment can be in the form of, for example, a strand (filament), a sheet, a plate, or a pellet. The pellet shape can be produced, for example, by preparing a strand-shaped propylene resin composition and then cutting it to an appropriate length.

[0136] Molded Article The present invention also relates to a molded article obtained by molding the propylene resin composition. That is, the propylene resin composition of this embodiment can be suitably used as a material for forming a molded article. The molded article can be obtained by molding the propylene resin composition by various molding methods. The shape, size, etc. of the molded article may be determined appropriately.

[0137] The propylene resin composition of the present embodiment can be used as a material for molded articles such as automotive materials, home appliance materials, monitor materials, office equipment materials, medical materials, drain pans, toiletry materials, food packaging containers, bottles, containers, sheets, films, etc. The propylene resin composition of the present embodiment is difficult to be charged and can suppress, for example, the adhesion of dust and the like, and therefore can be preferably applied to materials for vehicle-related members, home appliance materials, and food packaging containers such as retort pouches and pouches that can be heated in a microwave oven.

[0138] The propylene resin composition of the present embodiment is particularly preferably used as a material for injection molding.

[0139] Hereinafter, an example of an injection-molded article produced using the propylene resin composition of the present embodiment as an injection-molding material will be described.

[0140] The injection-molded article is an article molded from the propylene resin composition of the present embodiment. Injection-molded articles generally have excellent dimensional stability.

[0141] The injection-molded article can be produced by any suitable conventional injection molding method, such as 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.

[0142] The molded article (such as an injection molded article) of this embodiment can be produced by the above method in any suitable shape and size depending on the application.

[0143] Examples of material applications for vehicle-related members that are injection molded articles include interior parts such as door trims, pillars, instrument panels, consoles, rocker panels, armrests, door panels, and spare tire covers; exterior parts such as bumpers, spoilers, fenders, and side steps; and 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.

[0144] 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.

[0145] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples.

[0146] In the examples and comparative examples, the following raw materials were used.

[0147] Component P: Propylene-Based Polymer As component P, the following propylene-based polymer P1 was prepared.

[0148] (P1) Heterophagic propylene polymer material A heterophasic propylene polymer material was produced by gas phase polymerization in the presence of a polymerization catalyst obtained by the method described in Example 1 of JP-A-2004-182981. The physical properties of the obtained component P1 are as follows:

[0149] Melt flow rate (MFR) (230°C, 2.16 kg load): 27.5 g / 10 min (a) Propylene homopolymer component (Polymer I) Intrinsic viscosity: 1.06 dL / g (b) Propylene-ethylene random copolymer component (Polymer II) Intrinsic viscosity: 2.8 dL / g Proportion of propylene-ethylene random copolymer component: 21.0 wt% Proportion of ethylene in Polymer II: 39.0 wt%

[0150] In component P1, the "content of ethylene in polymer II" refers to the content of monomer units derived from ethylene based on the total weight of polymer II.

[0151] Ethylene Content in Polymer II The ethylene content in Polymer II was determined from the C-NMR spectrum measured under the following conditions based on the report by Kakugo et al. (Macromolecules, 15, 1150-1152 (1982)). The C-NMR spectrum was measured under the following conditions using a sample prepared by uniformly dissolving about 200 mg of heterophasic propylene polymer material in 3 mL of ortho-dichlorobenzene in a test tube with a diameter of 10 mm. Measurement temperature: 135°C Pulse repetition time: 10 seconds Pulse width: 45° Number of accumulations: 2500

[0152] Intrinsic viscosity (unit: dL / g) The intrinsic viscosity is a value measured at a temperature of 135°C using tetralin as a solvent by the following method.

[0153] 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, where the concentration is extrapolated to zero. The method for calculating the intrinsic viscosity by extrapolation is described, for example, on page 491 of "Polymer Solutions, Polymer Experiments 11" (published by Kyoritsu Shuppan Co., Ltd. in 1982).

[0154] Component D: Metal Deactivator As component D, the following metal deactivator was prepared.

[0155] (D1) Adekastab CDA-1M: 3-(N-salicyloyl)amino-1,2,4-triazole, manufactured by ADEKA Corporation (D2) Adekastab CDA-1: 2-Hydroxy-N-1H-1,2,4-triazol-3-ylbenzamide, manufactured by ADEKA Corporation (D3) Adekastab ZS-19: melamine resin ((1,3,5-triazine-2,4,6-triamine)H), manufactured by ADEKA Corporation ２ C=O (formaldehyde), phenolic compounds, and organic compound complexes

[0156] Component H: Hindered Amine Light Stabilizer As component H, the following hindered amine light stabilizer was prepared.

[0157] (H1) Uvinul 5050H manufactured by BASF Japan Ltd. (H2) Adekastab LA-52 manufactured by ADEKA Corporation: tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)=1,2,3,4-butanetetracarboxylate (H3) SABOSTAB UV 119 manufactured by SABO S.p.A.: a mixture of the following: 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, polycondensate of dimethyl succinate and 1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine

[0158] Component A: Other Additives As component A, which is another optional and suitable component, the following components were prepared.

[0159] (A1) Irganox 1010 manufactured by BASF Japan Ltd. (A2) Irgfos 168 manufactured by BASF Japan Ltd.

[0160] Examples 1 to 8 and Comparative Examples 1 to 5

[0161] Preparation of Propylene Resin Composition The raw materials having the compositions shown in Tables 1 and 2 were uniformly pre-mixed in a Henschel mixer or a tumbler, and then melt-kneaded using a twin-screw kneading extruder (TEX44αII-49BW-3V, manufactured by The Japan Steel Works, Ltd.) to obtain pellet-shaped propylene resin compositions.

[0162] The melt-kneading conditions were a cylinder temperature of 210°C, a screw rotation speed of 200 rpm, a screen mesh of 40 mesh, 80 mesh, and 40 mesh, three of which were stacked, and an extrusion rate of 50 kg / hr. The evaluation results are shown in Tables 1 and 2.

[0163] Production of injection-molded articles for tensile breaking strain evaluation Pelletized propylene resin composition was injection-molded under the following conditions within the range specified in JIS K7152 to produce injection-molded articles for tensile breaking strain evaluation. The propylene resin composition melted in the injection molding machine was fed into the mold cavity from the gate by the injection molding machine. The measurement results are shown in Tables 1 and 2. Injection molding machine: Toyo Machinery & Metal Si30III (clamping force 30 tons, cylinder diameter 18 mm) Cylinder temperature: 200°C Mold temperature: 50°C Injection speed: 20 mm / sec Cooling time: 30 sec

[0164] Evaluation of mold contamination (mold contamination area) After drying the pellet-shaped propylene resin composition at 100°C for 1 hour, 60 shots were continuously injection molded under the following conditions, and the molded body was removed. After that, a transparent heat-resistant polyester film was attached to the inside of the mold, the mold was clamped, and the mold was removed after being held for 5 seconds. The area of ​​the mold contamination part transferred to the film (unit: mm ２ ) was measured using an image analyzer. The smaller the area of ​​the mold contamination, the less mold contamination there was. Injection molding machine: Toyo Machinery & Metal Si30III (mold clamping force 30 tons, cylinder diameter 18 mm) Cylinder temperature: 260°C Mold temperature: 50°C Injection speed: 40 mm / sec Cooling time: 10 sec

[0165] Evaluation of Color Difference Before and After Water Resistance Test The pelletized propylene resin composition was dried at 100°C for 1 hour and then injection molded under the following conditions to produce a plate-shaped molded product measuring 80 mm in length, 35 mm in width, and 2.0 mm in thickness: Injection molding machine: Toyo Machinery & Metals Si30III (clamping force: 30 tons, cylinder diameter: 18 mm) Cylinder temperature: 220°C Mold temperature: 50°C Injection speed: 20 mm / sec Cooling time: 30 sec

[0166] One of the obtained flat molded bodies was placed in a 0.5 L glass bottle, water was then poured into it, the lid was closed and the bottle was sealed. The molded body was then submerged and fixed in a thermostatic water bath adjusted to 60°C and left to stand for 1000 hours.

[0167] Then, the glass bottle was taken out of the thermostatic water bath, and the plate-shaped molded body was taken out, and the water on the surface was wiped off.

[0168] The central part of the surface of the plate-like molded product was measured using a color difference meter (BYK-mac, manufactured by BYK Corporation) with a measurement area of ​​Φ23 mm, illumination of 45 degrees, and a measurement angle of 45 degrees. The value before the water resistance test was used as a reference, and the value after the water resistance test was measured to determine the color difference ΔE*ab.

[0169] It can be seen from Tables 1 and 2 that the molded articles according to the examples have large tensile breaking strains. That is, it was confirmed that the propylene resin composition of the present invention can produce molded articles having large tensile breaking strains, and that the molded articles of the present invention have large tensile breaking strains.

Claims

1. A propylene resin composition comprising a propylene polymer, a metal deactivator, and a hindered amine light stabilizer, wherein the ratio of the weight of the hindered amine light stabilizer to the weight of the metal deactivator is 10 or more.

2. The propylene resin composition according to claim 1, wherein the ratio of the weight of said hindered amine light stabilizer to the weight of said metal deactivator is 50 or less.

3. The propylene resin composition of claim 1, wherein the propylene-based polymer comprises a heterophasic propylene polymer material.

4. The propylene resin composition according to claim 1, wherein the weight ratio of the metal deactivator is 10 ppm by weight to 1000 ppm by weight based on 100 parts by weight of the total weight of the propylene resin composition.

5. The propylene resin composition according to claim 1, wherein the weight ratio of said hindered amine light stabilizer is 200 ppm by weight to 10,000 ppm by weight based on 100 parts by weight of the total weight of said propylene resin composition.

6. The propylene resin composition according to claim 1, wherein the weight ratio of said propylene polymer is 50 parts by weight or more based on 100 parts by weight of the total weight of said propylene resin composition.

7. The propylene resin composition according to claim 1, wherein the melt flow rate of the propylene resin composition (measured under conditions of a temperature of 230° C. and a load of 2.16 kgf) is 0.1 g / 10 min or more.

8. The propylene resin composition according to claim 1, wherein the propylene polymer has a melt flow rate (measured under conditions of a temperature of 230° C. and a load of 2.16 kgf) of 0.1 g / 10 min or more.

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

10. The propylene resin composition according to claim 9, wherein the weight ratio of said ethylene-α-olefin copolymer is 1 to 40 parts by weight based on 100 parts by weight of the total weight of said propylene resin composition.

11. The propylene resin composition of claim 1, further comprising an inorganic filler.

12. The propylene resin composition according to claim 11, wherein the weight ratio of said inorganic filler is 1 to 40 parts by weight per 100 parts by weight of the total weight of said propylene resin composition.

13. The propylene resin composition of claim 1, further comprising an ethylene-α-olefin copolymer and an inorganic filler.

14. A molded article comprising the propylene resin composition according to any one of claims 1 to 13.

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