JP2009221349A - Propylene based resin composition and its molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propylene based resin composition capable of making a molded article excellent in impact-resistance and heat-resistance, and its molded article. <P>SOLUTION: The propylene based resin composition contains 1-97 mass% of a propylene based polymer (A), 1-97 mass% of a polylactic acid based resin (B), 1-80 mass% of a modified filler (C) treated by a silane compound, and 1-97 mass% of a modifying agent (D). (Provided that the total of respective contents of the propylene based polymer (A), the polylactic acid based resin (B), the modified filler (C) and the modifying agent (D)is made to 100 mass%). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a propylene-based resin composition and a molded body thereof.

In recent years, the use of polylactic acid-based resins synthesized using plants as raw materials has been studied in consideration of the impact on the global environment.
For example, Japanese Patent Application Laid-Open No. 2007-145912 (Patent Document 1) describes a lactic acid resin composition characterized by containing a lactic acid resin, a propylene resin, and an inorganic filler.
JP 2007-145912 A

However, further improvement is required for the impact resistance and heat resistance of the lactic acid resin composition described in Patent Document 1.
Under such circumstances, an object of the present invention is to provide a propylene-based resin composition capable of producing a molded article with impact resistance and heat resistance, and a molded article thereof.

As a result of intensive studies, the present inventors have found that the present invention can solve the above problems, and have completed this.
That is, the present invention relates to a modified filler (C) treated with a silane compound and a propylene-based polymer (A) of 1% by mass to 97% by mass and a polylactic acid-based resin (B) of 1% by mass to 97% by mass. ) 1% by mass or more and 80% by mass or less, and a modifier (D) 1% by mass or more and 97% by mass or less. (However, the total content of the propylene polymer (A), the polylactic acid resin (B), the modified filler (C), and the modifier (D) is 100% by mass.)

  ADVANTAGE OF THE INVENTION According to this invention, the propylene-type resin composition which can make the molded object excellent in impact resistance and heat resistance, and its molded object can be obtained.

The propylene-based resin composition according to the present invention contains a predetermined amount of a propylene-based polymer, a polylactic acid-based resin, and a predetermined filler. This will be described in detail below.
[Propylene polymer (A)]
The propylene polymer used for the propylene resin composition of the present invention (hereinafter also referred to as component (A)) has a monomer unit derived from propylene, and is a propylene homopolymer (hereinafter referred to as component (A-). 1)), and at least one propylene-based polymer selected from the group consisting of propylene-ethylene copolymers (hereinafter also referred to as component (A-2)) is used.
As propylene-ethylene copolymer (component (A-2)), propylene-ethylene random copolymer (hereinafter also referred to as component (A-2-1)), propylene-ethylene block copolymer (hereinafter referred to as component) (Also referred to as (A-2-2)). This propylene-ethylene block copolymer (component (A-2-2)) is a copolymer comprising a propylene homopolymer component and a propylene-ethylene random copolymer component.
The propylene polymer (component (A)) is preferably a propylene homopolymer (component (A-1)) or a propylene-ethylene block copolymer (component (A) from the viewpoint of rigidity, heat resistance or hardness. -2-2)).

The isotactic pentad fraction measured by ¹³ C-NMR of the propylene homopolymer (component (A-1)) is preferably 0.95 or more, more preferably 0.98 or more. The isotactic pentad fraction of the propylene homopolymer component of the propylene-ethylene block copolymer (component (A-2)) measured by ¹³ C-NMR is preferably 0.95 or more, more preferably 0. .98 or more.

The isotactic pentad fraction is defined as A.I. Zambelli et al., Macromolecules, 6, 925 (1973), that is, isotactic linkage with pentad units in a propylene polymer molecular chain measured by ¹³ C-NMR, in other words propylene monomer units. The fraction of propylene monomer units at the center of five consecutive meso-bonded chains (however, the assignment of NMR absorption peaks is determined based on subsequently published Macromolecules, 8, 687 (1975)). . Specifically, the ratio of the mmmm peak area to the absorption peak area of the methyl carbon region measured by ¹³ C-NMR spectrum is the isotactic pentad fraction. NPL reference material CRM No. of NATIONAL PHYSICAL LABORATORY measured by this method. The isotactic pentad fraction of M19-14 Polypropylene PP / MWD / 2 was 0.944.

Intrinsic viscosity ([η] _P ) of propylene homopolymer (component (A-1)) measured in a tetralin solvent at 135 ° C., propylene homopolymer of block copolymer (component (A-2)) Intrinsic viscosity ([η] _P ) measured in a tetralin solvent at 135 ° C. of the component, Intrinsic viscosity measured in a tetralin solvent at 135 ° C. of the random copolymer (component (A-2-1)) [[ η]) is preferably 0.7 dl / g or more and 5 dl / g or less, more preferably 0.8 dl / g or more and 4 dl / g or less, respectively.

  Also, propylene homopolymer (component (A-1)), propylene homopolymer component of block copolymer (component (A-2-2)), random copolymer (component (A-2-1)) The molecular weight distribution (Q value, Mw / Mn) measured by gel permeation chromatography (GPC) is preferably 3 or more and 7 or less, respectively.

  The ethylene content contained in the propylene-ethylene random copolymer component of the block copolymer (component (A-2-2)) is 20% by mass to 65% by mass, preferably 25% by mass to 50%. It is not more than mass% (however, the total amount of propylene-ethylene random copolymer component is 100 mass%).

The intrinsic viscosity ([η] _EP ) measured in a 135 ° C. tetralin solvent of the propylene-ethylene random copolymer component of the block copolymer (component (A-2-2)) is preferably 1. 5 dl / g or more and 12 dl / g or less, more preferably 2 dl / g or more and 8 dl / g or less.

  The content of the propylene-ethylene random copolymer component constituting the block copolymer (component (A-2-2)) is 10% by mass to 60% by mass, preferably 10% by mass to 40% by mass. % Or less.

  The melt flow rate (MFR) of the propylene homopolymer (component (A-1)) is preferably from 0.1 g / 10 min to 400 g / 10 min, more preferably from 1 g / 10 min to 300 g / min. 10 minutes or less. However, the measurement temperature is 230 ° C. and the load is 2.16 kg.

  The melt flow rate (MFR) of the propylene-ethylene copolymer (component (A-2)) is preferably 0.1 g / 10 min or more and 200 g / 10 min or less, more preferably 1 g / 10 min or more. 150 g / 10 min or less. However, the measurement temperature is 230 ° C. and the load is 2.16 kg.

As a method of producing a propylene polymer (component (A)), a method of homopolymerizing propylene using a Ziegler-Natta type catalyst or a metallocene catalyst, or one or more olefins selected from olefins other than propylene and Examples thereof include a method of copolymerizing with propylene. The Ziegler-Natta type catalyst includes a catalyst system using a combination of a titanium-containing solid transition metal component and an organometallic component. Examples of the metallocene catalyst include a catalyst system using a combination of a transition metal compound of Group 4 to Group 6 having at least one cyclopentadienyl skeleton and a promoter component.
Examples of the polymerization method include a slurry polymerization method, a gas phase polymerization method, a bulk polymerization method, a solution polymerization method, and a polymerization method combining these. The polymerization method may be either batch type or continuous type, and may be one-stage polymerization or multi-stage polymerization. Moreover, as a propylene polymer (component (A)), you may use a commercially available propylene polymer.

[Polylactic acid resin (B)]
The polylactic acid resin used in the propylene resin composition of the present invention (hereinafter also referred to as component (B)) is a polylactic acid having a repeating unit derived from L lactic acid and / or a repeating unit derived from D lactic acid ( Hereinafter, it is simply referred to as polylactic acid) or a copolymer of this polylactic acid and other plant-derived polyester resins. The component (B) may contain other plant-derived polyester resins as necessary.
Examples of other plant-derived monomers copolymerizable with lactic acid include hydroxycarboxylic acids such as glycolic acid, aliphatic polyhydric alcohols such as butanediol, and aliphatic polycarboxylic acids such as succinic acid. The polylactic acid-based resin (component (B)) is obtained by a method of directly dehydrating polycondensation of lactic acid and / or other plant-derived monomers, or a cyclic dimer of lactic acid and / or hydroxycarboxylic acid (for example, lactide, glycolide, ε- Caprolactone) can be produced by a ring-opening polymerization method.

The content of the repeating unit derived from L-lactic acid or D-lactic acid contained in the above-mentioned “polylactic acid” and “polylactic acid segment in the copolymer of polylactic acid and other plant-derived polyester resin” enhances heat resistance. From the viewpoint, it is preferably 80 mol% or more, more preferably 90 mol% or more, and further preferably 95 mol% or more.
The weight average molecular weight (Mw) of the polylactic acid resin (component (B)) is preferably 10,000 or more and 1,000,000 or less, more preferably 50,000 or more and 500,000 or less. The molecular weight distribution (Q value, Mw / Mn) is preferably 1 or more and 4 or less. The molecular weight and molecular weight distribution are measured by gel permeation chromatography (GPC) using standard polystyrene as the molecular weight standard substance.

[Modified filler (C)]
The modified filler (hereinafter also referred to as component (C)) used in the propylene-based resin composition of the present invention refers to a filler treated with a silane compound. By using this modified filler, it is possible to produce a molded article having excellent impact resistance and heat resistance.
Examples of the silane compound include aminosilane compounds and epoxysilane compounds. Among these, it is preferable to use an epoxysilane compound.

  Examples of the filler used in the modified filler (C) include glass fibers, glass beads, glass flakes, talc, mica, montmorillonite, and clay, and talc is preferable.

  The average particle size of the filler used in the modified filler (C) is 0.01 μm or more and 50 μm or less, preferably 0.1 μm or more and 30 μm or less, more preferably 0.1 μm or more and 5 μm or less. By setting the average particle size to 0.01 μm or more, the modified filler (C) can be finely dispersed in the propylene-based resin composition of the present invention, and the impact resistance of the resulting molded body is improved. It becomes possible. Moreover, by making an average particle diameter 50 micrometers or less, it becomes possible to fully exhibit the reinforcement effect of a modified filler (C), and to improve the impact resistance of the molded object obtained. Here, the average particle size of the filler is a 50% equivalent particle size obtained from an integral distribution curve of a sieving method measured by suspending in a dispersion medium such as water or alcohol using a centrifugal sedimentation type particle size distribution measuring device. It means D50.

  The modified filler (C) is obtained by mixing the filler and the silane compound. As the modified filler (C), commercially available products such as trade names CHC-13S-05, CHC-13S-10E (all of which are manufactured by Hayashi Kasei Co., Ltd.) may be used.

[Modifier (D)]
The resin composition according to the present invention further contains a modifying agent (D) (hereinafter also referred to as component (D)) that can be agglomerated or covalently grafted onto the surface of the modified filler (C).
The modifier is not particularly limited as long as it is a compound that can be aggregated or covalently grafted onto the surface of the modified filler as described above. For example, when a modified filler surface-treated with an aminosilane compound is contained, a polyolefin or higher fatty acid having an (anhydrous) carboxyl group is preferably used, and contains a modified filler surface-treated with an epoxysilane compound. In this case, in addition to the above compounds, polyolefins having an amine group, aliphatic alcohols, aliphatic amines and the like are preferably used. These may be used alone or in combination of two or more.

  Examples of the polyolefin having (anhydrous) carboxyl group include (anhydrous) maleic acid grafted polypropylene and (anhydrous) maleic acid grafted ethylene-butene copolymer. Examples of the higher fatty acid include aliphatic carboxylic acids having 10 to 20 carbon atoms such as lauric acid, myristic acid, pentadecylic acid, palmitic acid, stearic acid, oleic acid, and linoleic acid. Examples of the polyolefin having an amine group include aminoethyl grafted polypropylene (meth) acrylate, aminopropyl grafted (meth) acrylate grafted ethylene-propylene-butene terpolymer, and the like. Examples of the aliphatic alcohol include C10-20 aliphatic alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and linoleyl alcohol. Examples of the aliphatic amine include aliphatic amines having 10 to 20 carbon atoms such as laurylamine, myristylamine, cetylamine, stearylamine, oleylamine, and linoleylamine. Among these, from the viewpoint of compatibility with polypropylene as a matrix resin, it is preferable to use (anhydrous) maleic acid grafted polypropylene. These can be used alone or in combination of two or more.

  The weight average molecular weight (Mw) of the (anhydrous) carboxyl group-containing polyolefin and amine group-containing polyolefin is preferably 1,000 or more and 1,000,000 or less. The weight average molecular weight (Mw) of (anhydrous) maleic acid grafted polypropylene is preferably 1,000 or more and 1,000,000 or less, and more preferably 5,000 or more and 500,000 or less from the viewpoint of reactivity and moldability.

(Anhydrous) maleic acid grafted polypropylene is obtained by adding (anhydrous) maleic acid and an organic peroxide as a radical generator to a propylene polymer, and melt-kneading, but a commercially available product may be used.
Examples of commercially available (anhydrous) maleic acid grafted polypropylene include Umex 1010 (trade name, manufactured by Sanyo Chemical Co., Ltd.).
From the viewpoint of obtaining sufficient adhesive strength without reducing the amount of (anhydrous) maleic acid grafted to the propylene polymer, the (anhydrous) maleic acid content is 100% by mass of the propylene polymer. It is 0.01 mass% or more, Preferably it is 0.1 mass% or more.

[Other ingredients]
In the present invention, in addition to the above components, other additional components may be added as necessary. Examples include compatibilizers, antioxidants, weather resistance improvers, nucleating agents, flame retardants, plasticizers, lubricants, antistatic agents, various colorants, organic fillers, elastomers and other resins.

Examples of the compatibilizer include a copolymer having a monomer unit derived from ethylene and a monomer unit derived from a monomer having an epoxy group, and a compound having an epoxy group.
Examples of the monomer having an epoxy group include α, β-unsaturated glycidyl ethers such as α, β-unsaturated glycidyl esters such as glycidyl methacrylate and glycidyl acrylate, allyl glycidyl ether, and 2-methylallyl glycidyl ether. Preferably, glycidyl methacrylate is mentioned.
In addition, examples of the compound having an epoxy group include glycidyl methacrylate-ethylene copolymer, glycidyl methacrylate-acrylonitrile-styrene copolymer, and glycidyl methacrylate-propylene copolymer.

In addition to the copolymer obtained by the above polymerization, a monomer having an epoxy group in polyethylene, polypropylene, polystyrene, ethylene-α-olefin copolymer, hydrogenated and non-hydrogenated styrene-conjugated diene, and the like. It is also possible to use a solution grafted by solution or melt kneading.
Of the copolymer and graft, a copolymer is more preferable in that the addition amount of the monomer having an epoxy group can be increased.

  In the polymer of the compound containing an epoxy group, the content of the monomer unit derived from the monomer having an epoxy group is 0.01% by mass or more and 30% by mass or less, more preferably 0.1% by mass. % To 20% by mass. However, the content of all monomer units in the ethylene-based polymer having an epoxy group is 100% by mass. In addition, content of the monomer unit derived from the monomer which has an epoxy group is measured by an infrared method.

  The melt flow rate (MFR) of the polymer of the compound containing an epoxy group is 0.1 g / 10 min or more and 300 g / 10 min or less, preferably 0.5 g / 10 min or more and 80 g / 10 min or less. However, the measurement temperature is 190 ° C. and the load is 2.16 kg.

  A known method is used as a method for producing a polymer of a compound containing an epoxy group. For example, a method of copolymerizing a monomer having an epoxy group with ethylene and, if necessary, another monomer by a high pressure radical polymerization method, a solution polymerization method, an emulsion polymerization method, or the like, Examples thereof include a method of graft polymerization of a monomer having a hydrogen atom.

  An elastomer means a rubber-like elastic body. The elastomer includes a rubber having a crosslinking point in the molecule and a thermoplastic elastomer in which the molecule is constrained by a molecular group of a hard layer in the molecule. In particular, elastomers are defined as having physical properties such that the melt flow rate measured at 190 ° C. is 0.1 g / 10 min or more and 3.0 g / 10 min or less.

  The elastomer is not particularly limited, but is a polyolefin-based elastomer (for example, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-α-olefin copolymer, ethylene-propylene-nonconjugated diene copolymer), fat Group polyester elastomers (for example, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polybutylene succinate carbonate), various acrylic rubbers, ethylene-acrylic acid copolymers and alkali metal salts thereof (so-called ionomers), ethylene -Acrylic acid elastomers such as glycidyl methacrylate copolymer and ethylene-alkyl acrylate copolymer (for example, ethylene-ethyl acrylate copolymer, ethylene -Butyl acrylate copolymer), acid-modified ethylene-propylene copolymer, diene rubber (eg, polybutadiene, polyisoprene, polychloroprene), copolymer of diene and vinyl monomer (eg, styrene-butadiene random copolymer) , Styrene-butadiene-styrene block copolymer) and the like.

  Examples of the α-olefin used for the ethylene-propylene-α-olefin copolymer include α-olefins having 4 to 20 carbon atoms. Examples of the α-olefin having 4 to 20 carbon atoms include linear α-olefins and branched α-olefins. Examples of the linear α-olefin include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1 -Tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nanodecene, 1-eicocene and the like. Examples of the branched α-olefin include 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-hexene and the like.

  As content of the component (A), the component (B), the component (C), and the component (D) used in the propylene-based resin composition of the present invention, the component (A), the component (B), the component (C ) And the total amount of component (D) is 100% by mass, the content of component (A) is 1% by mass to 97% by mass, and the content of component (B) is 1% by mass to 97%. The content of the component (C) is 1% by mass or more and 80% by mass or less, and the content of the component (D) is 1% by mass or more and 97% by mass or less. And from a viewpoint of the heat resistance and impact resistance of the obtained molded body, the content of the component (A) is preferably 10% by mass or more and 60% by mass or less, and the content of the component (B) is 10% by mass or more. It is 60 mass% or less, content of a component (C) is 20 mass% or more and 50 mass% or less, and content of a component (D) is 10 mass% or more and 60 mass% or less. A propylene resin composition having a component (C) content of 50% by mass or more and 80% by mass or less is preferably used as a filler master batch after being added to a propylene resin composition or other resin and diluted.

Moreover, you may add the said other additional component as needed. For example, when an elastomer is used as an additional component, the amount added is preferably 1 part by mass or more and 50 parts by mass with respect to 100 parts by mass of the total amount of the components (A) to (D). For example, when a compatibilizing agent is used as an additional component, it is 0.1 to 30 parts by mass with respect to 100 parts by mass of the total amount of the components (A) to (D). preferable.
The melt flow rate (MFR) of the propylene-based resin composition of the present invention is preferably 1 g / 10 min or more and 400 g / 10 min or less, more preferably 10 g / 10 min or more and 200 g / 10 min or less.

  As a manufacturing method of the propylene-type resin composition of this invention, the method of melt-kneading a component (A), a component (B), a component (C), and a component (D) by a well-known method is mentioned. The blending order and melt-kneading order of each component at the time of melt-kneading are arbitrary. The kneading temperature is preferably 180 ° C. or higher and 240 ° C. or lower.

  Examples of the method for producing a molded body comprising the propylene-based resin composition of the present invention include molding methods such as injection molding, extrusion molding, rotational molding, vacuum molding, foam molding, and blow molding. . Since the propylene-based resin composition of the present invention is excellent in impact resistance and heat resistance, it is used for industrial fields such as automobiles and home appliances.

Hereinafter, the present invention will be described in detail based on examples. The physical properties were evaluated by the following methods.
(1) Melt flow rate (MFR, unit: g / 10 minutes)
According to JIS K7210, the test temperature was 230 ° C. and the test load was 21.18 N.

(3) Impact resistance (Izod, unit: kJ / m ² )
It was measured with an Izod impact tester according to the method defined in JIS K7110. Impact resistance (Izod) was evaluated using a 3.2 mm thick V-notched test piece formed by injection molding. The measurement temperature was 23 ° C.

(4) Deflection temperature under load (HDT, unit: ° C)
The measurement was performed according to the method defined in JIS K7207. A test piece formed by injection molding with a width of 13 mm and a thickness of 6.4 mm was used, and the load was 0.45 MPa.

The materials used in the examples are as follows.
Component (A) Propylene polymer (A-1) “Noblen X101” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 40 g / 10 min)
(A-2) “Nobrene WPX5343” manufactured by Sumitomo Chemical Co., Ltd. (propylene-ethylene block copolymer, MFR (230 ° C.) = 50 g / 10 min)

Component (B) Polylactic acid-based resin (B-1) “Terramac TE-2000” manufactured by Unitika Ltd. (polylactic acid resin, MFR (230 ° C.) = 40 g / 10 minutes)

Component (C) Modified filler surface-treated with a silane compound (C-1) Modified talc “CHC-13S-10E” manufactured by Hayashi Kasei Co., Ltd. (modified by surface treatment with 1.0 mass% epoxysilane compound) Talc, average particle size = 2.7 μm)
(C-2) Unmodified talc “JR46” manufactured by Hayashi Kasei Co., Ltd. (talc, average particle size = 2.7 μm)

Component (D) Modifier (D-1) 100 parts by mass of propylene homopolymer (MFR (230 ° C.) = 0.5 g / 10 min) manufactured by Sumitomo Chemical Co., Ltd., 100 parts by mass of maleic anhydride, and radical generator After mixing together 0.16 parts by mass of “PARKADOX 14 / 40C” manufactured by Kayaku Akzo Co., Ltd. and 0.54 parts by mass of “PARCADOX 24FL” manufactured by the company, 90 mmφ twin-screw kneading extruder (manufactured by Nippon Placon Co., Ltd.) ), The cylinder temperature was set to 250 ° C., and (anhydrous) maleic acid grafted polypropylene was produced at an extrusion rate of 50 kg / hr and a screw rotation speed of 200 rpm. The grafting amount of maleic anhydride was 0.4% by mass with the total amount of (anhydrous) maleic acid grafted polypropylene being 100% by mass, and MFR (230 ° C.) was 100 g / 10 min.

Component (E) Elastomer (E-1) “Engage 8842” manufactured by Dow Chemical Co., Ltd. (ethylene-octene copolymer, MFR (190 ° C.) = 1.0 g / 10 min, specific gravity = 0.857 g / cm ³ )

Component (F) Polymer of Compound Containing Epoxy Group (F-1) “Bond First E” manufactured by Sumitomo Chemical Co., Ltd. (ethylene-glycidyl methacrylate copolymer, MFR (190 ° C.) = 3 g / 10 min, glycidyl Monomer unit content derived from methacrylate = 12% by mass)

[Example 1]
(Resin composition)
The resin composition according to the present invention was produced by the following method.
First, propylene homopolymer (A-1), propylene-ethylene block copolymer (A-) from an upstream inlet provided upstream of a cylinder of a 50 mmφ twin-screw kneading extruder (TEM 50A manufactured by Toshiba Machine Co., Ltd.). 2) A polylactic acid resin (B-1) and a polymer (F-1) of a compound containing an epoxy group as a compatibilizer were charged in the composition shown in Table 1.
Next, from the downstream inlet provided downstream of the upstream inlet, the modified filler (C-1), (anhydrous) maleic acid grafted polypropylene (D-1), and elastomer (E-1) And the composition described in Table 1. The cylinder temperature was set to 190 ° C., and a resin composition was produced under the conditions of an extrusion rate of 50 kg / hr and a screw rotation speed of 200 rpm.

(Injection molding)
Test pieces for evaluating physical properties were produced under the following injection molding conditions. Using the Sycap110 / 50 type injection molding machine manufactured by Sumitomo Heavy Industries, Ltd., the resin composition obtained above was molded at a molding temperature of 200 ° C., a mold cooling temperature of 35 ° C., an injection time of 25 seconds, and a cooling time of 25 seconds. Injection molding was performed. The impact resistance and the deflection temperature under load of the obtained injection molded product were measured. The results are shown in Table 1.

[Comparative Example 1]
From the upstream inlet provided upstream of the cylinder of the twin-screw kneading extruder, a propylene homopolymer (A-1), a propylene-ethylene block copolymer (A-2), and a polylactic acid resin (B -1), a polymer of an epoxy group-containing compound (F-1), and an unmodified filler (C-2) from a downstream inlet provided downstream of the upstream inlet. A resin composition and an injection-molded article were produced in the same procedure as in Example 1 with the composition shown in Table 1 and elastomer (E-1). The obtained injection molded body was measured for bending rigidity and deflection temperature under load. The results are shown in Table 1.

[Comparative Example 2]
From the upstream inlet provided upstream of the cylinder of the twin-screw kneading extruder, a propylene homopolymer (A-1), a propylene-ethylene block copolymer (A-2), and a polylactic acid resin (B -1), a polymer (F-1) of a compound containing an epoxy group, a modified filler (C-1), and an elastomer from a downstream inlet provided downstream of the upstream inlet A resin composition and an injection-molded article were produced in the same procedure as in Example 1 with the composition shown in Table 1 (E-1). The bending rigidity and the deflection temperature under load of the obtained injection molded body were measured. The results are shown in Table 1.

[Comparative Example 3]
A compound containing an propylene-ethylene block copolymer (A-2), a polylactic acid resin (B-1), and an epoxy group from an upstream inlet provided upstream of the cylinder of the twin-screw kneading extruder Table 1 shows the modified filler (C-1) and the elastomer (E-1) from the polymer (F-1) and the downstream inlet provided downstream of the upstream inlet. A resin composition and an injection molded article were produced in the same procedure as in Example 1 with the described composition. The bending rigidity and the deflection temperature under load of the obtained injection molded body were measured. The results are shown in Table 1.

Claims (4)

1% by mass or more and 97% by mass or less of the propylene polymer (A),
1% by mass or more and 97% by mass or less of polylactic acid resin (B),
1% by mass or more and 80% by mass or less of a modified filler (C) treated with a silane compound;
Denaturant (D) 1% by mass to 97% by mass,
A propylene-based resin composition. (However, the total content of the propylene polymer (A), the polylactic acid resin (B), the modified filler (C), and the modifier (D) is 100% by mass.)   The propylene-based resin composition according to claim 1, wherein the modified filler (C) is a filler treated with an aminosilane compound and / or an epoxysilane compound.   The modifying agent (D) is at least one selected from the group consisting of (anhydrous) carboxyl group-containing polyolefin, higher fatty acid, amine group-containing polyolefin, aliphatic alcohol, and aliphatic amine. 2. The propylene-based resin composition according to 2.   The molded object which consists of a propylene-type resin composition in any one of Claim 1 to 3.