JP2010144047A - Propylenic resin composition and its molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propylenic resin composition which is good in the dispersion of a polylactic acid-based resin and is more excellent in impact resistance, and to provide a molded article using the same. <P>SOLUTION: The propylenic resin composition comprises 10 to 88 mass% of a propylenic polymer (A) having a melt flow rate of 0.1 to 17 g/10 min measured at 230°C, 10 to 88 mass% of a polylactic acid-based resin (B), 1 to 50 mass% of an epoxy group-containing ethylenic polymer (C), and 1 to 50 mass% of an elastomer compound (D) (wherein, the amounts of the propylenic polymer (A), the polylactic acid-based resin (B), the epoxy group-containing ethylenic polymer (C), and the elastomer compound (D) are each an amount based on the total amount of the four components). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a propylene-based resin composition and a molded body thereof. Specifically, it relates to a propylene resin composition containing a polylactic acid resin, an ethylene polymer containing an epoxy group, and predetermined elastomers, and a molded product 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, Patent Document 1 contains a polylactic acid-based resin, a polypropylene-based resin, and an epoxidized polyolefin for the purpose of providing a resin composition capable of providing a molded article excellent in impact strength and the like. The resin composition characterized by this is described.
Patent Document 2 discloses a crystalline polypropylene polymer, a polylactic acid resin, an ethylene polymer having an epoxy group, and an ethylene having the epoxy group as a resin composition excellent in tensile elongation at break, impact resistance and gloss. A resin composition containing an elastomer different from the polymer is described.

JP 2007-106843 A JP 2007-277444 A

However, further improvement is required for the impact resistance of the molded product obtained from the resin composition as described above.
Under such circumstances, an object of the present invention is to provide a propylene-based resin composition having good dispersibility of a polylactic acid-based resin and more excellent impact resistance, and a molded body using the same.

  The present inventors have found that it is possible to solve the problems of the present invention by adopting the following configuration, and have completed the present invention.

That is, the present invention relates to the following invention.
<1> 10 to 88% by mass of a propylene polymer (A) having a melt flow rate measured at 230 ° C. of 0.1 to 17 g / 10 min,
10 to 88% by mass of polylactic acid resin (B),
1 to 50% by mass of an ethylene polymer (C) containing an epoxy group;
The propylene-type resin composition containing 1-50 mass% of elastomers (D).
(However, the amounts of the propylene polymer (A), the polylactic acid resin (B), the ethylene polymer (C) containing the epoxy group, and the elastomers (D) are the total amount of these four components, respectively. To the amount.)
<2> The propylene polymer (A) is at least one propylene polymer selected from the group consisting of a propylene homopolymer (A-1) and a propylene-ethylene copolymer (A-2). The propylene-based resin composition according to <1>, wherein
<3> A molded article using the propylene-based resin composition according to <1> or <2>.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the propylene-type resin composition excellent in the dispersibility of polylactic acid-type resin, and more excellent in impact resistance, and a molded object consisting thereof.

  The propylene resin composition according to the present invention includes a propylene polymer (A) having a specific melt flow rate (MFR), a polylactic acid resin (B), an ethylene polymer (C) containing an epoxy group, And elastomers (D). This will be described in detail below.

[Propylene polymer (A)]
The propylene polymer used in the present invention (hereinafter also referred to as component (A)) has a monomer unit derived from propylene, and is a propylene homopolymer (hereinafter also referred to as component (A-1)). And the at least 1 sort (s) of propylene polymer chosen from the group which consists of a propylene-ethylene copolymer (henceforth a 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 from the viewpoint of rigidity, heat resistance or hardness of the molded product. (Component (A-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.
Propylene - propylene homopolymer component of the ethylene block copolymer (component (A-2-2)), an isotactic pentad fraction measured by ¹³ C-NMR is preferably 0.95 or more, more preferably Is 0.98 or more.

The isotactic pentad fraction is defined as A.I. The method described in Macromolecules, 6, 925 (1973) by Zambelli et al., Ie isotactic linkage in pentad units in a propylene polymer molecular chain as measured by ¹³ C-NMR, in other words propylene monomer units Is 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-2-2)) Intrinsic viscosity ([η] _P ) measured in a tetralin solvent at 135 ° C. of the polymer component, Intrinsic viscosity measured in a tetralin solvent at 135 ° C. of the random copolymer (component (A-2-1)) ([Η]) is preferably 0.7 to 5 dl / g, and more preferably 0.8 to 4 dl / g.

  Also, propylene homopolymer (component (A-1)), propylene homopolymer component of block copolymer (component (A-2-2)), random copolymer (component (A-2-1)) Molecular weight distribution measured by gel permeation chromatography (GPC) (Q value, (weight average molecular weight (Mw) / number average molecular weight (Mn)), hereinafter sometimes abbreviated as “Mw / Mn”) Preferably, it is 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 to 65% by mass, preferably 25 to 50% by mass (provided that The total amount of propylene-ethylene random copolymer component is 100% by 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. It is 5-12 dl / g, More preferably, it is 2-8 dl / g.

  Content of the propylene-ethylene random copolymer component which comprises the said block copolymer (component (A-2-2)) is 10-60 mass%, Preferably it is 10-40 mass%.

The melt flow rate (MFR) of the propylene polymer (component (A)) is 0.1 to 17 g / 10 minutes, preferably 1 to 10 g / 10 minutes. However, the melt flow rate here is measured under the conditions of a test load of 21.18 N and a test temperature of 230 ° C. by the method specified in JIS K 7210 (1995).
By setting the melt flow rate (MFR) of the component (A) to 0.1 g / 10 min or more, it is possible to facilitate injection molding of the propylene-based resin composition that is the final product. Further, by setting the melt flow rate (MFR) to 17 g / 10 min or less, it becomes possible to obtain a propylene-based composition having good impact resistance when formed into a molded body.

  In addition, the range of melt flow rate (MFR), that is, the propylene polymer (component (A)) of 0.1 to 17 g / 10 min is a propylene homopolymer (component) in the range of the melt flow rate (MFR). (A-1)) can be used alone or in admixture of two or more. Moreover, the propylene-ethylene copolymer (component (A-2)) within the range of the melt flow rate (MFR) can be used alone or in admixture of two or more.

As a method for 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-based resin (hereinafter also referred to as component (B)) contained in the propylene-based resin composition of the present invention is a resin comprising a polymer composed only of repeating units derived from L-lactic acid and / or D-lactic acid. , A resin comprising a copolymer comprising a repeating unit derived from L-lactic acid and / or D-lactic acid and a repeating unit derived from a monomer other than L-lactic acid and D-lactic acid, or L-lactic acid and / or D- A mixture of a polymer composed only of a repeating unit derived from lactic acid, a repeating unit derived from L-lactic acid and / or D-lactic acid, and a repeating unit derived from a monomer other than L-lactic acid and D-lactic acid It is resin which consists of. In addition, the repeating unit derived from L-lactic acid and the repeating unit derived from D-lactic acid may be referred to as an L-lactic acid-derived repeating unit and a D-lactic acid-derived repeating unit, respectively.

Examples of monomers other than L-lactic acid and D-lactic acid include hydroxycarboxylic acids such as glycolic acid, aliphatic polyhydric alcohols such as butanediol, and aliphatic polycarboxylic acids such as succinic acid. Polylactic acid resin (component (B))
A method of dehydrating polycondensation of lactic acid (L-lactic acid, D-lactic acid, or a mixture of L-lactic acid and D-lactic acid) and, if necessary, further other monomers,
A method of ring-opening polymerization of a cyclic dimer of lactic acid (ie, lactide),
Ring-opening polymerization of lactide and a cyclic bimolecular condensate of lactic acid and a hydroxycarboxylic acid other than lactic acid,
Cyclic bimolecular condensate of lactide and / or lactic acid and hydroxycarboxylic acid other than lactic acid, and if necessary, cyclic dimer of hydroxycarboxylic acid other than lactic acid (for example, glycolide) or cyclic ester derived from hydroxycarboxylic acid (For example, ε-caprolactone) can be produced by a ring-opening polymerization method.

When the polylactic acid-based resin (component (B)) contains a polymer containing both L-lactic acid-derived repeating units and D-lactic acid-derived repeating units, the polymer is used from the viewpoint of heat resistance of the propylene-based resin composition. The content of the repeating unit derived from L-lactic acid and / or the content of the repeating unit derived from D-lactic acid is preferably 80 mol% or more, more preferably 90 mol% or more, and still more preferably 95 mol%. That's it.
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 (Mw / Mn) of the polylactic acid resin (B) is preferably 1 or more and 4 or less. The symbol Mn represents the number average molecular weight. In addition, molecular weight Mw, Mn, and molecular weight distribution are measured by GPC using standard polystyrene as a molecular weight standard substance.

[Ethylene polymer containing epoxy group (C)]
The ethylene-based polymer containing an epoxy group used in the present invention (hereinafter also referred to as component (C)) is a copolymer having a monomer unit derived from ethylene. 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, it is glycidyl methacrylate.

  The component (C) may have a monomer unit derived from another monomer. Examples of the other monomer include methyl acrylate, ethyl acrylate, methyl methacrylate, Examples thereof include unsaturated carboxylic acid esters such as butyl acrylate, and unsaturated vinyl esters such as vinyl acetate and vinyl propionate.

  Moreover, in a component (C), content of the monomer unit derived from the monomer which has an epoxy group is 0.01-30 mass%, More preferably, it is 0.1-20 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 component (C) is 0.1 g / 10 min to 300 g / 10 min, preferably 0.5 g / 10 min to 80 g / 10 min. The melt flow rate here is measured under the conditions of a test load of 21.18 N and a test temperature of 190 ° C. by the method defined in JIS K 7210 (1995).

  As a method for producing the component (C), a known method is used. For example, by a high-pressure radical polymerization method, a solution polymerization method, an emulsion polymerization method, etc., a monomer having an epoxy group, ethylene, and the like may be used. And a method of copolymerizing a monomer having an epoxy group with an ethylene resin.

[Elastomers (D)]
Examples of elastomers (hereinafter also referred to as component (D)) used in the present invention include natural rubber, polybutadiene rubber, polyisoprene rubber, butyl rubber, amorphous or low-crystalline ethylene elastomer, propylene elastomer, Examples thereof include butadiene-styrene elastomer, butadiene-acrylonitrile elastomer, hydrogenated or non-hydrogenated styrene-conjugated diene block elastomer, polyester rubber, acrylic rubber, and silicon rubber. These may be used alone or in combination. Among these, it is preferable to use an ethylene-based elastomer.

The ethylene-based elastomer is an elastomer containing a monomer unit derived from ethylene as a main component, for example, an ethylene homopolymer, an ethylene-α-olefin copolymer, an ethylene-ethylenically unsaturated ester copolymer. Etc. Moreover, the copolymer of polyunsaturated compounds, such as a conjugated diene and a nonconjugated diene, and ethylene and an alpha olefin can also be mentioned. These may be used alone or in combination.
Such an ethylene-based polymer is preferably an ethylene-α-olefin copolymer that is a copolymer of ethylene and one or more α-olefins. The α-olefin is preferably an α-olefin having 3 to 12 carbon atoms. Specifically, for example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 4-methyl-1-pentene, 4 -Methyl-1-hexene, vinylcyclohexane, vinylcyclohexene, styrene, norbornene, butadiene, isoprene and the like.

  The ethylene-based elastomer and propylene-based elastomer may be amorphous or low crystalline. Here, “amorphous” means that a crystal melting peak having a heat of fusion of 1 J / g or more is not observed from −100 ° C. to 200 ° C. by differential scanning calorimetry (DSC). The term “low crystallinity” means that a crystal melting peak having a heat of fusion of 1 to 30 J / g is observed from −100 ° C. to 200 ° C. by differential scanning calorimetry (DSC).

  Examples of hydrogenated and non-hydrogenated styrene-conjugated diene block elastomers include styrene-isoprene copolymers, styrene-isoprene-styrene copolymers, styrene-ethylene-butene-styrene copolymers, and styrene-butadiene copolymers. And styrene-butadiene-styrene copolymer.

The melt flow rate (MFR) of the elastomers (component (D)) is preferably 0.1 g / 10 min to 100 g / 10 min from the viewpoint of the mechanical strength of the obtained molded product. More preferably, it is 0.3 g / 10 minutes-50 g / 10 minutes, Most preferably, they are 0.5 g / 10 minutes-40 g / 10 minutes. For example, the melt flow rate (MFR) of the ethylene-α-olefin copolymer is preferably 0.1 g / 10 min or more, and is 100 g / 10 min or less from the viewpoint of the mechanical strength of the obtained molded product. More preferably, it is 0.3 g / 10 minutes-50 g / 10 minutes, Most preferably, they are 0.5 g / 10 minutes-40 g / 10 minutes.
The melt flow rate here is measured under the conditions of a test load of 21.18 N and a test temperature of 190 ° C. by the method specified in JIS K 7210 (1995).

Density elastomers (component (D)), from the viewpoint of the mechanical strength of the molded article obtained are 850 kg / m ³ or more ~910kg / m ^3, more preferably at 855kg / m ³ ~900kg / m ³ is there. For example, in the case of the density of the ethylene-α-olefin copolymer, it is preferably 850 kg / m ³ or more, and preferably 910 kg / m ³ or less from the viewpoint of increasing the tensile elongation at break. More preferably from ^{855kg / m 3 ~900kg / m 3} .
The density here is measured without annealing by the method defined in JIS K 6760-1981.

  The molecular weight distribution (Mw / Mn) of the elastomers (component (D)) is preferably 1.8 to 3.5, more preferably 1.8 to 2 from the viewpoint of mechanical strength of the obtained molded product. .5, and most preferably 1.8 to 2.2. For example, the molecular weight distribution of the ethylene-α-olefin copolymer is preferably 1.8 to 3.5, more preferably 1.8 to 2.5, and most preferably 1.8 to 2.2. It is. The degree of biodegradation of elastomers (component (D)) measured in accordance with the method specified in JIS K6953 is less than 60% in the period (180 days) specified in the test method.

  The melting temperature of the elastomers (component (D)) is preferably 110 ° C. or less, more preferably 100 ° C. or less, from the viewpoint of the mechanical strength of the resulting molded article. The amount of heat of fusion of the ethylene elastomer is preferably 110 J / g or less, more preferably 100 J / g or less, from the viewpoint of increasing the tensile elongation at break. For example, the melting temperature of the ethylene-α-olefin copolymer is 110 ° C. or lower, more preferably 100 ° C. or lower. The amount of heat of fusion of the ethylene-α-olefin copolymer is preferably 110 J / g or less, more preferably 100 J / g or less.

As a method for producing the elastomer (component (D)), a known polymerization method using a known olefin polymerization catalyst is used.
For example, in the case of an ethylene-α-olefin copolymer, a solution polymerization method, a slurry polymerization method, a high-pressure ion polymerization method, a gas phase polymerization method using a Ziegler-Natta catalyst, a complex catalyst such as a metallocene complex or a nonmetallocene complex In addition, it is preferable to produce by a bulk polymerization method, a solution polymerization method or the like using a radical initiator. Among them, it is preferable to use a polymerization method using a Ziegler-Natta catalyst or a complex catalyst, and it is preferable to use a method of producing in the presence of a metallocene catalyst.

The melt flow rate (MFR) of the elastomers (component (D)) can be appropriately adjusted by adjusting the degree of polymerization when the component (D) is produced by polymerization. Further, the density of the component (D), it is possible to adjust the 850kg / m ³ ~910kg / m ³ by appropriately adjusting the ratio of the raw material monomer used in the polymerization. Further, the molecular weight distribution of the component (D) can be adjusted by appropriately adjusting the type of the catalyst and the polymerization conditions during the polymerization.

  Propylene polymer (component (A)), polylactic acid resin (component (B)), ethylene polymer containing epoxy group (component (C)), and elastomer used in the propylene resin composition of the present invention As the content of the class (component (D)), the content of the component (A) is 10 to 88% by mass and the content of the component (B) is 10 to 88% as the total amount of these four components. It is mass%, content of a component (C) is 1-50 mass%, and content of a component (D) is 1-50 mass%. And from a viewpoint of improving rigidity and improving the appearance of a molded product, the content of the component (A) is preferably 30 to 70% by mass, and the content of the component (B) is 10 to 50% by mass, Content of a component (C) is 2-30 mass%, and content of a component (D) is 2-30 mass%.

  As a manufacturing method of the propylene-type resin composition of this invention, the method of melt-kneading component (A), (B), (C) and (D) is mentioned. The order of blending the components and the order of melt kneading during melt kneading are arbitrary. The kneading temperature is preferably 180 to 240 ° C.

  In the present invention, in addition to the above components (A), (B), (C) and (D), other additional components may be added as necessary within the range not impairing the object of the present invention. . Examples thereof include antioxidants, weather resistance improvers, nucleating agents, flame retardants, plasticizers, lubricants, antistatic agents, various colorants, organic fillers, inorganic fillers, and other resins.

  Examples of the inorganic filler include glass fiber, carbon fiber, metal fiber, glass bead, mica, calcium carbonate, titanium oxide, zinc oxide, potassium titanate whisker, talc, kaolinite, bentonite, smectite, sepiolite, wollastonite. Montmorillonite, clay, allophane, imogolite, fibrous magnesium oxysulfate, barium sulfate, glass flakes, carbon black and the like.

  As an average particle diameter of inorganic fillers other than fibrous form, it is 0.01-500 micrometers, Preferably it is 0.1-100 micrometers, More preferably, it is 0.1-20 micrometers. Here, the average particle diameter of the inorganic filler is equivalent to 50% 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 the particle diameter D50.

  The average fiber diameter of the fibrous inorganic filler is 0.001 to 50 μm, preferably 0.01 to 30 μm. The average fiber length in the composition is 0.01 to 10000 μm, preferably 0.1 to 1000 μm.

  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. . The obtained molded body has high impact resistance and is suitably used in 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.

(2) Izod impact strength (unit: kJ / m ² )
The measurement was performed according to the method defined in JIS K7110. A test piece molded by injection molding was used. The thickness of the test piece was 3.2 mm, and the Izod impact strength with a notch that was notched after molding was evaluated. The measurement temperature was 23 ° C.

The materials used in the examples are as follows.
Component (A): Propylene polymer (A1) “Noblen H501N” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 3 g / 10 min, isotactic pentad fraction [mmmm] = 0 975, [η] = 2.0, Mw / Mn = 5)
(A2) “Noblen W101” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 9 g / 10 min, isotactic pentad fraction [mmmm] = 0.975, [η] = 1. 6, Mw / Mn = 5)
(A3) “Nobrene Y101E1” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 15 g / 10 min, isotactic pentad fraction [mmmm] = 0.975, [η] = 1. 45, Mw / Mn = 5)
(A4) “Nobrene R101” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 20 g / 10 min, isotactic pentad fraction [mmmm] = 0.975, [η] = 1. 4, Mw / Mn = 5)
(A5) “Nobrene X101A” manufactured by Sumitomo Chemical Co., Ltd. (propylene homopolymer, MFR (230 ° C.) = 40 g / 10 min, isotactic pentad fraction [mmmm] = 0.975, [η] = 1. 25, Mw / Mn = 5)
Component (B): Polylactic acid resin (B1) “Terramac TE-2000” manufactured by Unitika Ltd. (polylactic acid resin, MFR (230 ° C.) = 40 g / 10 min, Mw = 120,000, Mw / Mn = 1. 8)
Component (C): Ethylene polymer containing epoxy group (C1) “Bond First E” manufactured by Sumitomo Chemical Co., Ltd. (ethylene-glycidyl methacrylate copolymer, MFR (190 ° C.) = 3 g / 10 min, glycidyl meta (Monomer unit content derived from acrylate = 12 mass%)
Component (D): Elastomers (D1) “Engage 8842” manufactured by Dow Chemical Co., Ltd. (ethylene-octene copolymer, MFR (190 ° C.) = 1.2 g / 10 min, density = 0.858 g / cm ³ )

[Example 1]
(Resin composition)
The resin composition according to the present invention was produced by the following method.
A propylene homopolymer (A1), a polylactic acid resin (B1), an ethylene-based polymer (C1) containing an epoxy group, and an elastomer (D1) with the composition shown in Table 1 and 50 mmΦ biaxial kneading Using an extruder (TEM 50 manufactured by Toshiba Machine Co., Ltd.), 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. The resin composition obtained above was injection 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 using a SYCAP 50 type injection molding machine manufactured by Sumitomo Heavy Industries, Ltd. Went. The MFR and Izod impact strength of the obtained injection molded product were measured. The results are shown in Table 1.

[Example 2]
A propylene homopolymer (A2), a polylactic acid resin (B1), an ethylene polymer (C1) containing an epoxy group, and an elastomer (D1) having the composition shown in Table 1 and the same as in Example 1 A resin composition and an injection-molded article were produced by the procedure described above. The MFR and Izod impact strength of the obtained injection molded product were measured. The results are also shown in Table 1.

[Example 3]
A propylene homopolymer (A3), a polylactic acid resin (B1), an ethylene-based polymer (C1) containing an epoxy group, and an elastomer (D1) having the composition shown in Table 1 and the same as in Example 1 A resin composition and an injection-molded article were produced by the procedure described above. The MFR and Izod impact strength of the obtained injection molded product were measured. The results are also shown in Table 1.

[Comparative Example 1]
A propylene homopolymer (A4), a polylactic acid resin (B1), an ethylene polymer (C1) containing an epoxy group, and an elastomer (D1) having the composition shown in Table 1 and the same as in Example 1 A resin composition and an injection-molded article were produced by the procedure described above. The MFR and Izod impact strength of the obtained injection molded product were measured. The results are also shown in Table 1.

[Comparative Example 2]
A propylene homopolymer (A5), a polylactic acid resin (B1), an ethylene polymer (C1) containing an epoxy group, and an elastomer (D1) having the composition shown in Table 1 and the same as in Example 1 A resin composition and an injection-molded article were produced by the procedure described above. The MFR and Izod impact strength of the obtained injection molded product were measured. The results are also shown in Table 1.

  The polypropylene resin composition containing the polylactic acid resin of the present invention is excellent in impact strength and can be used in the field of automobile interior and exterior parts.

Claims (3)

10 to 88% by mass of a propylene polymer (A) having a melt flow rate measured at 230 ° C. of 0.1 to 17 g / 10 min;
10 to 88% by mass of polylactic acid resin (B),
1 to 50% by mass of an ethylene polymer (C) containing an epoxy group;
The propylene-type resin composition containing 1-50 mass% of elastomers (D).
(However, the amounts of the propylene polymer (A), the polylactic acid resin (B), the ethylene polymer (C) containing the epoxy group, and the elastomers (D) are the total amount of these four components, respectively. To the amount.)   The propylene polymer (A) is at least one propylene polymer selected from the group consisting of a propylene homopolymer (A-1) and a propylene-ethylene copolymer (A-2). Item 2. The propylene-based resin composition according to Item 1.   The molded object which uses the propylene-type resin composition of Claim 1 or 2.