JP2009155517A - Propylene-based resin composition and molded article of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propylene-based resin composition capable of obtaining a molded article improved in mechanical strength, shrinkage anisotropy, dimensional stability, appearance, etc., of the molded article, and the molded article of the same. <P>SOLUTION: In the resin composition containing a propylene-based resin, a polylactic acid-based resin, an ethylene-based polymer having an epoxy group and elastomers, the propylene-based polymer (A) contains a propylene-ethylene random copolymer, and the intrinsic viscosity ([η]<SB>EP</SB>) of the propylene-ethylene random copolymer measured in tetraline solvent at 135°C is set as 3.5 to 10 dl/g. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a propylene-based resin composition and a molded body thereof. Specifically, the present invention relates to a polylactic acid-based resin, a propylene-based resin composition containing an epoxy group, and a molded body comprising the same.

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 discloses a resin composition containing a polyolefin resin, polylactic acid, and an acid or epoxy group-containing polyolefin.
JP 2006-077063 A

However, further improvements are required for the mechanical strength of the molded body obtained from the resin composition as described above, the anisotropy of the shrinkage rate of the molded product, the dimensional stability, the appearance, and the like.
In view of the above problems, in the present invention, a propylene-based resin composition capable of obtaining a molded article having improved mechanical strength, anisotropy of the shrinkage of the molded article, dimensional stability, appearance, and the like, and the molded article thereof The purpose is to provide.

  The present inventors use a propylene resin having a predetermined configuration in a resin composition containing a propylene resin, a polylactic acid resin, and an ethylene polymer containing an epoxy group. It has been found that the problems of the invention can be solved, and the present invention has been completed. Specifically, the following are provided.

The present invention comprises 10 to 89% by mass of a propylene polymer (A), 10 to 89% by mass of a polylactic acid resin (B), 1 to 50% by mass of an ethylene polymer (C) containing an epoxy group, The propylene polymer (A) contains a propylene-ethylene random copolymer component, and a 135 ° C. tetralin solvent for the propylene-ethylene random copolymer component. A propylene resin composition having an intrinsic viscosity ([η] _EP ) measured in the range of 3.5 to 10 dl / g.
(However, the total content of the propylene resin (A), the polylactic acid resin (B), and the ethylene polymer (C) containing an epoxy group is 100% by mass.)

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the resin composition which the dispersibility of polylactic acid-type resin is favorable, and is excellent in mechanical strength, tensile elongation, the dimensional stability of a molded article, and an external appearance, and its molded object.

The propylene resin composition according to the present invention contains a propylene polymer having a predetermined configuration, a polylactic acid resin, and an ethylene polymer containing an epoxy group. 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)) is a propylene-ethylene copolymer (hereinafter also referred to as component (A-1)) having a monomer unit derived from propylene. contains.
As propylene-ethylene copolymer (component (A-1)), propylene-ethylene random copolymer (hereinafter also referred to as component (A-1-1)), propylene-ethylene block copolymer (hereinafter referred to as component). (Also referred to as (A-1-2)). This propylene-ethylene block copolymer (component (A-1-2)) is a copolymer comprising a propylene homopolymer component and a propylene-ethylene random copolymer component.

The isotactic pentad fraction of the propylene homopolymer component of the propylene-ethylene block copolymer (component (A-1)) 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. The method described in Macromolecules, 6, 925 (1973) by Zambelli et al., Ie isotactic linkage in the pentad unit in the propylene polymer molecular chain measured by ¹³ C-NMR, in other words propylene monomer unit 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 ) measured in a 135 ° C. tetralin solvent of the propylene homopolymer component of the propylene-ethylene copolymer (component (A-1)), 135 ° C. tetralin of the random copolymer The intrinsic viscosity ([η]) measured in the solvent is preferably 0.7 to 5 dl / g, and more preferably 0.8 to 4 dl / g. By setting it as 0.7 dl / g or more, it is possible to make the mechanical strength of the molded object obtained sufficient. In addition, by setting the intrinsic viscosity to 5 dl / g or less, it is possible to suppress the occurrence of a large flow mark or the like in the molded body and deterioration of the appearance.

  Further, a propylene homopolymer component of propylene-ethylene copolymer (component (A-1)), a molecular weight distribution (Q value, Mw / Mn) measured by gel permeation chromatography (GPC) of a random copolymer. ) Is preferably 3 or more and 7 or less, respectively. By setting it to 3 or more, it is possible to improve fluidity during molding. Moreover, it is possible to prevent that an external appearance deteriorates by setting it as 7 or less.

  The ethylene content contained in the propylene-ethylene random copolymer component of the propylene-ethylene copolymer (component (A-1)) is 20 to 65 mass%, preferably 25 to 50 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 propylene-ethylene copolymer (component (A-1)) is preferably 3. 5 to 10 dl / g, more preferably 4 to 7 dl / g.
If the intrinsic viscosity ([η] _EP ) is less than 3.5 dl / g, the tensile elongation, rigidity, and Izod impact strength are lowered, the anisotropy of the shrinkage rate of the molded product is increased, and the appearance is deteriorated. There are things to do. On the other hand, when the intrinsic viscosity ([η] _EP ) exceeds 10 dl / g, the tensile elongation may be reduced, or fish eyes may be generated on the surface of the molded product, thereby deteriorating the appearance.

  Content of the propylene-ethylene random copolymer component which comprises the said propylene-ethylene copolymer (component (A-1)) is 5-60 mass%, Preferably it is 10-40 mass%.

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

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 resin used in 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 simply referred to as polylactic acid). ), Or a copolymer of this polylactic acid and other plant-derived polyester resin. 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 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.

[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 ethylene-based polymer (C) having the epoxy group may have a monomer unit derived from another monomer. Examples of the other monomer include methyl acrylate, acrylic Examples thereof include unsaturated carboxylic acid esters such as ethyl acid, methyl methacrylate and butyl acrylate, and unsaturated vinyl esters such as vinyl acetate and vinyl propionate.

  In the ethylene polymer (C) having an epoxy group, the content of the monomer unit derived from the monomer having an epoxy group is 0.01 to 30% by mass, more preferably 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 ethylene-based polymer (C) having an epoxy group 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 ethylene-based polymer (C) having an epoxy group, a known method is used. For example, a monomer having an epoxy group and ethylene by a high-pressure radical polymerization method, a solution polymerization method, an emulsion polymerization method, or the like. And a method of copolymerizing with other monomers as necessary, a method of graft-polymerizing a monomer having an epoxy group to an ethylene-based resin, and the like.

[Elastomers (D)]
The propylene-based resin composition according to the present invention may contain elastomers (hereinafter also referred to as component (D)). Examples of the elastomers (D) include natural rubber, polybutadiene rubber, polyisoprene rubber, butyl rubber, ethylene-based elastomer, propylene-based elastomer, butadiene-styrene elastomer, butadiene-acrylonitrile elastomer, styrene-conjugated diene block elastomer, and polyester rubber. , Acrylic rubber, silicon rubber and the like. The ethylene elastomer and the propylene elastomer may be amorphous or low crystalline. Further, the styrene-conjugated diene block elastomer includes a hydrogenated styrene-conjugated diene block elastomer and a non-hydrogenated styrene-conjugated diene block elastomer. 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.
Among these, it is preferable to use 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 at −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-ethylenebutene-styrene copolymers, styrene-butadiene copolymers, Examples thereof include styrene-butadiene-styrene copolymers. Moreover, as a propylene-type elastomer, the propylene homopolymer of an attack tic structure, a propylene-butene-1 copolymer, etc. are mentioned.

The density of the ethylene-based elastomer, in view of enhancing the mechanical strength of the molded article obtained are 850 kg / m ³ or more ~910kg / m ^3, more preferably from ^{855kg / m 3 ~900kg / m 3} . 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 melt flow rate (MFR) of the ethylene-based elastomer is preferably 0.1 g / 10 min to 100 g / 10 min from the viewpoint of increasing the mechanical strength of the obtained molded product. More preferably, it is 0.3g / 10min-50g / 10min, More preferably, it is 0.5g / 10min-40g / 10min.
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 increasing the mechanical strength of the obtained molded product. . More preferably, it is 0.3g / 10min-50g / 10min, More preferably, it is 0.5g / 10min-40g / 10min.
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).

  The molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the ethylene-based elastomer is preferably 1.8 to 3.5, more preferably from the viewpoint of increasing the mechanical strength of the obtained molded body. Is 1.8 to 2.5, 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 melting temperature of the ethylene-based elastomer is preferably 110 ° C. or less, more preferably 100 ° C. or less, from the viewpoint of increasing the mechanical strength of the obtained 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 ethylene elastomer, a known polymerization method using a known olefin polymerization catalyst is used.
For example, in the case of ethylene-α-olefin copolymer, solution polymerization method, slurry polymerization method, high pressure ion polymerization method, gas phase polymerization method using Ziegler-Natta catalyst, complex catalyst such as metallocene complex and 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.

As content of each component used for the propylene-type resin composition of this invention, when the total amount of a component (A), a component (B), and a component (C) is 100 mass%, content of a component (A) The amount is 10 to 89% by mass, the content of component (B) is 10 to 89% by mass, and the content of component (C) is 1 to 50% by 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%.
Moreover, content of a component (D) is 1-50 mass% when the total amount of the said component (A)-(D) is 100 mass parts, and it is preferable that it is 2-30 mass%.
As a manufacturing method of the propylene-type resin composition of this invention, the method of melt-kneading a component (A), a component (B), and a component (C) 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 to 240 ° C.

  In the present invention, in addition to the above components, other additional components may be added as necessary. 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. Means a 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 propylene-based resin composition of the present invention is excellent in elongation, rigidity, impact strength, dimensional stability, and appearance, and thus is used for applications 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 load was 21.18N.
The temperature was measured at 230 ° C. for propylene-based resins and 190 ° C. for ethylene-based polymers and elastomers having an epoxy group.
(2) Monomer unit content derived from glycidyl methacrylate (unit: mass%)
A press sheet was prepared, and the absorbance of the characteristic absorption in the infrared absorption spectrum was corrected with the thickness, and the calibration curve method was used. In addition, as the glycidyl methacrylate characteristic absorption, a peak at 910 cm ⁻¹ was used.

(3) Intrinsic viscosity ([η], unit: dl / g)
Intrinsic viscosities were measured at three concentrations of 0.1, 0.2 and 0.5 g / dl using an Ubbelohde viscometer. The intrinsic viscosity is calculated by the calculation method described in “Polymer Solution, Polymer Experiments 11” (published by Kyoritsu Shuppan Co., Ltd.), page 491. That is, the reduced viscosity is plotted against the concentration, and the concentration is extrapolated to zero. Obtained by extrapolation. The propylene polymer was evaluated at a temperature of 135 ° C. using tetralin as a solvent.
(4) Molecular weight distribution (Q value)
It measured on the conditions shown below using the gel permeation chromatography (GPC).
GPC: Waters 150C type Column: Showa Denko Co., Ltd. Product name: Shodex 80 MA
Sample amount: 300 μl (polymer concentration 0.2 wt%)
Flow rate: 1 ml / min
Temperature: 135 ° C
Solvent: o-dichlorobenzene A standard curve of elution volume and molecular weight was prepared using standard polystyrene manufactured by Toyo Soda Co., Ltd. Using a calibration curve, the polystyrene-equivalent weight average molecular weight (Mw) and number average molecular weight (Mn) of the sample are obtained, and the Q value, that is, the weight average molecular weight / number average molecular weight (Mw / Mn) is obtained as a measure of the molecular weight distribution. It was.

(5) Differential scanning calorimetry (DSC)
A differential scanning calorimeter (DSC220C manufactured by Seiko Denshi Kogyo Co., Ltd .: input compensation DSC) was used for measurement under the following conditions. Indium was used as a standard material for measurement.
(I) About 5 mg of the sample was heated from room temperature to 200 ° C. at a rate of temperature increase of 30 ° C./min, and held for 5 minutes after completion of the temperature increase.
(Ii) Next, the temperature was decreased from 200 ° C. to −100 ° C. at a rate of temperature decrease of 10 ° C./min, and held for 5 minutes after the temperature decrease was completed.
(Iii) Next, the temperature was increased from −100 ° C. to 200 ° C. at a temperature increase rate of 10 ° C./min.

(6) Tensile elongation (unit:%)
The measurement was performed according to the method specified in ASTM D638. A test piece molded by injection molding was used. The thickness of the test piece was 3.2 mm, the tensile speed was 20 mm / min, and the elongation at break between the marked lines (50 mm) was evaluated. The measurement temperature was 23 ° C.

(7) Flexural rigidity (FM, unit: MPa)
The measurement was performed according to the method defined in JIS K7203. A test piece molded by injection molding was used. The thickness of the test piece was 3.2 mm, the bending load speed was 2.0 mm / min, and the bending stiffness (FM) was evaluated. The measurement temperature was 23 ° C.

(8) Izod impact strength (unit: kJ / m ² )
It measured according to the method prescribed | regulated to JISK7110 (1984). 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.

(9) Shrinkage The shrinkage is measured for 48 hours after molding, using a magnescale, measured in the flow direction (MD) and the direction perpendicular to the flow direction (TD), and contracted based on the mold dimensions. The rate was determined.
The molded article was measured using a flat plate of 100 mm × 400 mm × 2 mmt. The gate is installed at the center of the side surface of 100 mm, the direction of 400 mm is MD, and the direction of 100 mm side is TD.
Anisotropy was expressed in MD / TD. The closer the value is to 1, the smaller the anisotropy and the better the dimensional stability.

(10) Flow mark generation position (appearance)
Measurement was performed using a flat plate of 100 mm × 400 mm × 2 mmt. The distance from the gate position to the position where the flow mark was generated was measured. The longer the distance, the fewer the flow marks and the better the appearance. In this measurement method, when it is 200 mm or more, the appearance is good.

The materials used in the examples are as follows.
(A) Propylene polymer (component (A))
“Noblen AZ565” manufactured by Sumitomo Chemical Co., Ltd. (polypropylene block copolymer, MFR (230 ° C.) = 33 g / 10 min, intrinsic viscosity ([η] _EP ) is 5 dl / g)
(B) Polylactic acid resin (component (B))
“Terramac TE-4000” manufactured by Unitika Ltd.
(C) Ethylene polymer having an epoxy group (component (C))
“Bond First E” manufactured by Sumitomo Chemical Co., Ltd. (ethylene-glycidyl methacrylate copolymer, MFR (190 ° C.) = 3 g / 10 min, monomer unit content derived from glycidyl methacrylate = 12% by mass)
(D) Elastomers (component (D))
“Excellen FX CX5505” manufactured by Sumitomo Chemical Co., Ltd. (ethylene-1-butene copolymer, monomer unit content derived from 1-butene = 23 mass%, MFR (190 ° C.) = 16 g / 10 min, d = 880 kg / m ³ , weight average molecular weight (Mw) / number average molecular weight (Mn) ratio = 1.8, melting temperature = 53 ° C., heat of fusion = 51 J / g)
(E) Pigment As a pigment master batch, 3 parts by mass of a black pigment master batch (trade name PEM-8Y2320MB) manufactured by Sumika Color Co., Ltd. was used.

[Example 1]
The resin composition according to the present invention was produced by the following method.
Using a 50 mmφ twin-screw kneading extruder (TEM50A manufactured by Toshiba Machine Co., Ltd.) having a plurality of raw material inlets, kneading was carried out in the proportions and kneading methods shown in Table 1. The cylinder temperature was set to 190 ° C., pellets of the resin composition were obtained at an extrusion rate of 50 kg / hr and a screw rotation speed of 200 rpm.

Test pieces for evaluating physical properties were produced under the following injection molding conditions. The resin composition pellets obtained above were molded using a Saicap 110/50 type injection molding machine manufactured by Sumitomo Heavy Industries, Ltd., at a molding temperature of 200 ° C., a mold cooling temperature of 30 ° C., an injection time of 15 seconds, and a cooling time of 30 seconds. The injection molding was performed. The injection molded article thus obtained was measured for Izod impact strength, tensile elongation, and heat distortion temperature.
The dimension of the molded product and the test piece for measuring the flow mark were produced under the following conditions. A 100 mm × 400 mm × 2 mmt lithographic plate was molded using a SE180D injection molding machine manufactured by Sumitomo Heavy Industries, Ltd. under conditions of a molding temperature of 200 ° C., a mold temperature of 30 ° C., an injection time of 20 seconds, and a cooling time of 35 seconds.
The results are shown in Table 1.

Claims (3)

10 to 89% by mass of the propylene polymer (A),
10 to 89% by mass of polylactic acid resin (B),
1 to 50% by mass of an ethylene polymer (C) containing an epoxy group, and a propylene resin composition containing
The propylene polymer (A) contains a propylene-ethylene random copolymer component, and the intrinsic viscosity ([η] _EP ) of the propylene-ethylene random copolymer component measured in a 135 ° C. tetralin solvent. Is a propylene-type resin composition which is 3.5-10 dl / g.
(However, the total content of the propylene resin (A), the polylactic acid resin (B), and the ethylene polymer (C) containing an epoxy group is 100% by mass.)   The propylene-based resin composition according to claim 1, wherein the content of the propylene-ethylene random copolymer component in the propylene-based polymer (A) is 5 to 60% by mass.   The molded object formed by shape | molding the propylene-type resin composition of Claim 1 or 2.