JPH093276A - Resin composition - Google Patents

Abstract

PURPOSE: To obtain a resin composition remarkably improved in moldability and processability and capable of improving appearance of a sheet or film made therefrom by lowering melt viscosity while keeping a melt tension of a thermoplastic elastomer. CONSTITUTION: This composition consists of 100 pts.wt. of a thermoplastic elastomer of which main component is a polypropylene-based elastomer containing 33 to 99wt.% of a propylene-ethylene copolymer component and having <=4 a molecular weight disribution expressed as a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn), and 0.01 to 5 pts.wt. of metal soap prepared by reacting an aliphatic carboxylic acid with an oxide or hydroxide of a II group metal of the periodic table so that the reacting amount of the II group metal exceeds a theoretical amount. The composition has 400-1200Pa.s melt viscosity of the thermoplastic elastomer at 150s<-1> and >=1g melt tension of the thermoplastic elastomer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel thermoplastic resin composition. More specifically, a film or sheet (hereinafter collectively referred to as a film) having improved moldability by lowering the melt viscosity while maintaining the melt tension of the thermoplastic elastomer, and having the characteristics of the thermoplastic elastomer and having an extremely good appearance. The present invention provides a thermoplastic resin composition capable of being molded.

[0002]

2. Description of the Related Art Thermoplastic elastomers containing polypropylene-based elastomer as a main component (hereinafter also referred to as "thermoplastic elastomers") have properties such as tackiness when formed into a film and appropriate elasticity, so that they are used for industrial wrapping. It is expected to be used as an industrial film.

Conventionally, the above-mentioned thermoplastic elastomer is
It is generally known that it has a wide molecular weight distribution, but it has good molding processability and transparency immediately after molding, but with the passage of time, low molecular weight products bleed out on the surface of the film, which is a molded product, and its appearance Has a problem of aggravating.

Therefore, it has been studied to narrow the molecular weight distribution of the thermoplastic elastomer to eliminate the bleed-out of the low molecular weight product of the molded article.

However, when the molecular weight distribution is narrowed, the melt viscosity becomes high, so that the moldability is deteriorated, and when the film is processed, a defective appearance such as melt fracture or sharkskin occurs.

[0006] As a countermeasure against such a defective appearance, there is a method of performing the molding by raising the temperature during film forming and decreasing the melt viscosity, but deterioration of the resin and decrease of melt tension are observed during the molding process, and high speed is required. Not suitable for film formation.

A method of improving the flow at the time of molding by adding an olefin wax or a surfactant to the thermoplastic elastomer can be considered, but sufficient effect can be obtained for such a high viscosity resin. I can't.

[0008]

Therefore, it has been desired to develop a thermoplastic elastomer having improved moldability by lowering the melt viscosity while maintaining the melt tension of the thermoplastic elastomer.

[0009]

Means for Solving the Problems As a result of repeated studies to solve the above problems, the inventors of the present invention maintained the melt tension of a resin by adding a specific metal soap to a thermoplastic elastomer. As it was, they found that the melt viscosity was lowered to solve the above problems and the appearance of the molded article was improved, and the present invention was completed.

That is, in the present invention, the weight average molecular weight (Mw)
The molecular weight distribution represented by the ratio (Mw / Mn) to the number average molecular weight (Mn) is 4 or less, and the propylene-ethylene copolymer component is 30 to 99% by weight (hereinafter abbreviated as "wt%"). 100 parts by weight of a thermoplastic elastomer containing a polypropylene-based elastomer as a main component, and an aliphatic carboxylic acid and an oxide or hydroxide of a Group II metal of the Periodic Table are contained in a theoretical amount of the Group II metal. A thermoplastic resin composition comprising 0.01 to 5 parts by weight of a metal soap obtained by reacting in an excessive amount.

The thermoplastic elastomer used in the present invention has a molecular weight distribution represented by Mw / Mn of 4 or less and is mainly composed of a polypropylene elastomer containing 30 to 99 wt% of a propylene-ethylene copolymer component. is there.

That is, when the molecular weight distribution of the polypropylene-based elastomer exceeds 4, the amount of the low molecular weight portion is large, and the resulting thermoplastic resin composition has a poor appearance due to bleeding out of the low molecular weight portion after being formed into a film. Cause the problem of. The molecular weight distribution of the polypropylene-based elastomer may be 4 or less, but particularly 2.0 to 3.
The range of 5 is preferable.

When the proportion of the propylene-ethylene copolymer component of the polypropylene-based elastomer is less than 30 wt%, the resulting thermoplastic resin composition has increased rigidity and insufficient flexibility characteristics, and is molded into a film. In this case, there is a problem that the elasticity peculiar to the thermoplastic elastomer is impaired. Further, when the proportion of the propylene-ethylene copolymer component exceeds 99 wt%, the thermoplastic resin composition obtained has increased elasticity and insufficient flow characteristics, and has a molding processability when formed into a film. It has problems such as getting worse.

The proportion of the propylene-ethylene copolymer component of the polypropylene-based elastomer is, in particular, 50 to 50.
A range of 95 wt% is suitable.

In this case, the propylene polymer component of the obtained polymer is 1 to 70 wt%, preferably 3 to 60%.
wt%, more preferably 5 to 50 wt%, and the content of the propylene-ethylene random copolymer component is 90 to 20 mol% of the monomer unit based on polypropylene in the copolymer component, preferably 85 to 40 mol%, more preferably 85 to 50 and 10 to 80 mol% of the monomer unit based on ethylene, preferably 15 to 60 mol%, more preferably 15 to 50 mol%. .

In the present invention, the thermoplastic elastomer contains the above polypropylene-based elastomer as a main component, but may contain other resin components within a range that does not significantly affect the properties of the polypropylene-based elastomer. . As the resin component, for example,
High density polyethylene, low density polyethylene, copolymer of ethylene and C _{4 to} C ₁₀ α-olefin, ethylene vinyl acetate copolymer, polyethylene methacrylate polyethylene resin, polypropylene homocopolymer, polypropylene ethylene block copolymer Examples thereof include polymers or random copolymers, polypropylene-ethylene-butene-1 terpolymers, and styrene elastomers.
Further, the blending amount of these resin components is somewhat different depending on the kind of the resin component, but generally 20 wt% or less is appropriate with respect to the polypropylene elastomer.

In the present invention, the other characteristics of the thermoplastic elastomer containing the polypropylene elastomer as a main component are not particularly limited. Generally, 150
Melt viscosity at s ⁻¹ is 600 to 1400 Pa · s, preferably 500 to 1300 Pa · s, and melt tension is 1 g.
Above all, it is preferable that 1.5 to 7.0 g particularly constitutes the composition of the present invention in order to exhibit excellent properties as a material for film formation.

The method for producing the above-mentioned polypropylene elastomer used in the present invention is not particularly limited, but the following method is mentioned as a typical production method.

That is, the following components (A) and (B), or further (C) and / or (D) (A) titanium compound (B) organoaluminum compound (C) electron donor (D) general formula RI (however, R is an iodine atom, a C1-C7 alkyl group, or a phenyl group.)
0.1 to 500 g of propylene in the presence of an iodine compound represented by
-Preliminary polymerization is carried out to obtain a titanium compound to obtain a catalyst-containing prepolymer, and then 1-butene and propylene are polymerized in the presence of the catalyst-containing prepolymer to obtain a mixture of propylene and ethylene. This is a method in which random copolymerization of the mixture is sequentially performed to obtain a high-molecular weight powdery substance, and the powder is further decomposed with an organic peroxide so that the molecular weight distribution is adjusted to 4 or less.

Such a manufacturing method is disclosed in JP-A-5-32046.
As described in detail in Japanese Patent No. 8 and the like, in the present invention, the polypropylene-based elastomer produced by the method is preferably used.

In the present invention, the additive component to the thermoplastic elastomer is an aliphatic carboxylic acid and a periodic table element.
A metal soap obtained by reacting a Group II metal oxide or hydroxide with the Group II metal of the Periodic Table in excess of the theoretical amount. 05
It is a metal soap in a molar excess of 1 mol.

The fatty acid used as the raw material of the metal soap is at least one kind of unsaturated monocarboxylic acid having 12 to 30 carbon atoms, and has a side chain, a hydroxyl group, a ketone group, an aldehyde group, an epoxy group or the like in the structure. May be. Examples of the fatty acid having 12 or more carbon atoms include palmitic acid, stearic acid, oleic acid, erucic acid and the like.

Further, as the metal constituting the metal soap,
Specific examples include IIa alkaline earth metals and IIb zinc group metals, and Mg, Ca and Zn are preferable. A typical compound of this metal soap is magnesium 12-hydroxystearate.

The metal soap reaction conditions are that the temperature of the aliphatic carboxylic acid used is not lower than the melting point of the aliphatic carboxylic acid used, and the oxide or hydroxide of the Group II metal of the periodic table is the theoretical group II metal. It can be obtained by directly reacting by adding it in excess of the amount.

The metal content of the metal soap of the present invention is preferably excessive with respect to the aliphatic carboxylic acid. Metal soap with an excessive amount of metal oxide relative to the aliphatic carboxylic acid, when added to the resin compared to those without excessive metal content (normal metal soap), the appearance of the product is It will be good. This is because the metal soap itself becomes alkaline because the amount of metal is excessive with respect to the aliphatic carboxylic acid, and by adding this metal soap to the resin, the added base resin also becomes in an alkaline atmosphere, It is estimated that bleeding can be suppressed.

The amount of the metal soap added is 0.01 to 5 parts by weight based on 100 parts by weight of the thermoplastic elastomer. When the addition amount of the metal soap is less than 0.01 part by weight, the effect of improving the appearance of the film obtained by molding is not sufficiently exhibited. On the other hand, if the addition amount is more than 5 parts by weight, the metal soap bleeds out into the film obtained by molding, which is not preferable. Considering the improvement of molding processability and bleed-out, the content is preferably 0.03 to 3 parts by weight, more preferably 0.05 to 2 parts by weight.

The above-mentioned thermoplastic elastomer, metal soap and the like can be generally kneaded at a temperature not lower than the melting point of the resin using a known kneading apparatus. For example, using a screw extruder, Banbury mixer, mixing roll, etc., 160 to 330 ° C., preferably 170 to 300
A method of kneading at ℃ can be adopted. Further, the melt-kneading can be performed in a stream of an inert gas such as nitrogen gas. Incidentally, a known mixing device before melt kneading, for example,
Premixing can also be performed using a tumbler, a Henschel mixer, or the like.

The metal soap of the present invention is added directly to a resin,
Generally, the above kneading is performed and used, but it is also possible to use a high concentration masterbatch further containing 1 to 50 wt% of metal soap and mix it with a resin at the time of molding. The compounding amount in this case is, for example, resin 100
0.1 to 100 parts by weight, preferably 0.5 to 2 in a masterbatch having a metal soap content of 10 wt% based on parts by weight.
5 parts by weight.

The thermoplastic resin composition of the present invention further comprises an average molecular weight of 100 with respect to 100 parts by weight of the above metal soap.
1 to 100 parts by weight, preferably 500 to 8000 polyethylene glycol, preferably 1 to 100 parts by weight, preferably 3 to
It is more preferable to add 43 parts by weight to further improve the molding characteristics.

The thermoplastic resin composition of the present invention may be appropriately blended with known additives such as antioxidants, light stabilizers and antistatic agents.

Further, in addition to the above-mentioned respective components, an inorganic filler is added in an amount of 1 to 70 parts by weight, preferably 3 to 60 parts by weight, relative to 100 parts by weight of the thermoplastic elastomer, whereby rigidity and dimensional stability are improved. It is possible to improve the sex. As the inorganic filler, calcium carbonate, magnesium carbonate, magnesium sulfate, talc, clay, silica,
Known materials such as glass fiber, carbon fiber, potassium titanate whiskers, wollastonite and the like can be used without any limitation.

The resin composition of the present invention has the above composition.
Since the fluidity is improved while maintaining the melt tension, the melt viscosity at a shear rate of 150 s ^-1 is 400 to 1200P.
a · s, especially 400 to 1100 Pa · s, melt tension is 1
It is a thermoplastic elastomer excellent in molding processability, which can obtain g or more, particularly 1.5 g or more.

The melt viscosity and melt tension of the thermoplastic elastomer of the present invention were measured at 230 ° C.

[0034]

The resin composition of the present invention has a low melt viscosity,
Since the melt tension is high, the molding processability is good, and it can be used for various moldings such as extrusion molding such as T-die and inflation, modified molding, blow molding and the like. Examples of applications of products obtained by such a molding method include wrap films, shrink films, staple films, sealant films, sizing films, adhesive tapes, masking films, agricultural films, and medical films as film applications. As a sheet, stationery sheet, occlusal sheet, desk mat, agricultural sheet, etc.
Examples of molded articles include cosmetic boxes, cosmetic bags, packaging boxes, packaging bags, food containers, miscellaneous goods parts, hoses, tubes, toys, and the like.

[0035]

EXAMPLES The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

The measuring method used in the following examples will be described.

1) Measurement of molecular weight distribution The number average molecular weight (Mn), the weight average molecular weight (Mw) and the ratio of the molecular weight of 10,000 or less were measured by GPC (gel permeation chromatography). This was carried out at 135 ° C. using GPC-150C manufactured by Waters, using O-dichlorobenzene as a solvent. The column used was TS manufactured by Tosoh Corporation.
K gel GMH6-HT, gel size 10-15μ
It is. The calibration curve has a weight average molecular weight of 9 as a standard sample.
50, 2900, 10,000, 50,000, 49.8 million, 2.7 million,
It was created using 6.75 million polystyrene.

2) Method for measuring respective proportions of ethylene-based monomer units and propylene-based monomer units in propylene-ethylene random copolymer component and method for measuring polybutene component proportion ¹³ C-NMR spectrum charts are shown. It was calculated using.
That is, the respective proportions of the ethylene-based monomer units and the propylene-based monomer units in the propylene-ethylene random copolymer component were first described in page 1848 of Polymer (Polymer) Vol. 29 (1988). Method to determine the attribution of peaks, and then Macromolecules
The respective ratios of the monomer units based on ethylene and the monomer units based on propylene were calculated by the method described in Volume 10 (1977) p. 773. Then, the weight and proportion of the polybutene component were calculated from the integrated intensity ratio of the peak derived from methyl carbon in the monomer unit and the peak derived from methyl carbon in the polybutene component based on propylene.

3) Measurement of isotacticity of poly 1-butene Measurement by ¹³ C-NMR, Polymer Journal (Polymer J.) Vol. 16 (1984) 71
Based on pages 6-726.

4) Melt index The melt index was measured according to JIS K7210.

5) Measurement of melt viscosity 230 using Capirograph 1B manufactured by Toyo Seiki Co., Ltd.
The melt viscosity at 150 ° C. and 150 s ⁻¹ was measured.

6) Haze value Measured according to JIS K6714.

7) Measurement of melt tension 230 using a melt tension type II manufactured by Toyo Seiki Co., Ltd.
The measurement was carried out under conditions of ℃, extrusion speed 5 mm / min, and take-up speed 100 rpm.

Production Examples 1-1 to 1-4 (Preliminary Polymerization) A glass autoclave reactor having an internal volume of 1 liter equipped with a stirrer was sufficiently replaced with nitrogen gas, and then 400 ml of heptane was inserted. Keeping the temperature inside the reactor at 20 ° C., diethylene glycol dimethyl ether 0.18 mmol, ethyl iodide 22.7 mmo
1, diethyl aluminum chloride 18.5mmo
l, and titanium trichloride (TOS-
17 ") 22.7 mmol was added, and then propylene was continuously introduced into the reactor for 30 minutes so that the amount of propylene was 3 g per 1 g of titanium trichloride. The temperature during this period was kept at 20 ° C. After stopping the supply of propylene, the inside of the reactor was sufficiently replaced with nitrogen gas, and the obtained titanium-containing polypropylene was washed four times with purified heptane. As a result of the analysis, 2.9 g of propylene was polymerized per 1 g of titanium trichloride.

(Main Polymerization) Step 1: Polymerization of 1-butene A stainless steel autoclave reactor having an internal volume of 1 liter equipped with a stirrer was sufficiently replaced with nitrogen gas, and then 400 ml of heptane was inserted. The reactor temperature is 20
Keep at ℃, diethyl aluminum chloride 18.15
mmol, diethyl glycol dimethyl ether 0.1
8 mmol, 22.7 mmol of ethyl iodide, and 22.7 mmol of titanium-containing polypropylene obtained by prepolymerization as titanium trichloride were added, and 1-butene was continuously added for 2 hours so that the amount of 1-butene was 15 g per 1 g of titanium trichloride. It was introduced into the reactor. The temperature during this period was kept at 20 ° C. After the supply of 1-butene was stopped, the inside of the reactor was replaced with nitrogen gas to obtain a titanium-containing poly-1-butene polymer.
As a result of the analysis, 14 g of 1-butene was polymerized per 1 g of titanium trichloride.

Step 2: Polymerization of Propylene and Copolymerization of Propylene-Ethylene 1 liter of liquid propylene and 0.70 mmol of diethylaluminum chloride were added to a 2 liter autoclave subjected to nitrogen substitution, and the internal temperature of the autoclave was adjusted to 70 ° C. The temperature was raised. 0.087 mmol of titanium-containing poly-1-butene polymer was added as titanium trichloride, and propylene was polymerized at 70 ° C. for 60 minutes. During this time, hydrogen was not used. Then, the internal temperature of the autoclave is rapidly increased to 55
At the same time as the temperature was lowered to 0 ° C, a mixed solution of 0.50 mmol of ethyl aluminum sesquiethoxide (EtAl (OEt) ₂ ) and 0.014 mmol of methyl methacrylate was added, ethylene was supplied, and the ethylene gas concentration in the gas phase was adjusted to 7
Copolymerization of propylene and ethylene was carried out at 55 ° C. for 120 minutes so that the concentration became mol%. The ethylene gas concentration during this period was 7 mol% while confirming with a gas chromatograph.
Held. During this time, hydrogen was not used. After polymerization,
Unreacted monomer was purged to obtain a particulate polymer. No adhesion was observed in the polymerization tank or on the stirring blade.
The yield was 140 g, and the polymerization ratio of all polymers was 7370.
It was g-polymer / g-titanium trichloride.

Further, as a result of separately polymerizing only propylene, titanium trichloride 1 was obtained at 70 ° C. for 60 minutes.
1030 g of propylene was polymerized per g.
As a result, the polybutene component in the block copolymer was 0.
It can be seen that 19 wt% and polypropylene component are 14 wt%. The results are shown in Table 1.

Next, to the obtained polymer (30 kg), 1,3-bis- (t-butylperoxyisopropyl) benzene was added as an organic peroxide in a ratio shown in Table 2, and an antioxidant was added. Add 0.1 phr and mix for 1 minute with a Henschel mixer, then use a φ65 mm single screw extruder to
Melt-kneading was performed at 0 ° C. to obtain pellets.

Production Examples 2 and 3 In the polymerization of 1-butene of Production Example 1, the polymerization amount of 1-butene was 3 g and 50 g per 1 g of titanium trichloride, and the copolymerization of propylene and ethylene was carried out at an ethylene gas concentration of 1 g. The same operation as in Production Example 1 was performed except that the amounts were 3.5 mol% and 8 mol%, respectively. The results are shown in Table 1. Further, in the same manner as in Production Example 1, melt kneading was carried out with the amounts of organic peroxides shown in Table 2.

Production Example 4 Production of propylene in Production Example 1 was repeated except that propylene was polymerized at 60 ° C. for 10 minutes and propylene and ethylene were copolymerized so that the ethylene gas concentration was 12 mol%. The same operation as in Example 1 was performed. In a separate polymerization experiment, the polymerization rate of propylene at this time was 240 g-PP / g.
-TiCl. The results are shown in Table 1. Further, in the same manner as in Production Example 1, melt kneading was carried out with the amounts of organic peroxides shown in Table 2.

Comparative Production Example 1 After the same prepolymerization as in Production Example 1, the main polymerization was carried out as follows.

(Main Polymerization) After replacing a stainless steel autoclave reactor having an internal volume of 2 liter equipped with a stirrer with nitrogen gas, 1 liter of liquid propylene, 0.73 mmol of diethylaluminum chloride and diethylaluminum (2,6) -Di-t-butylphenoxide) to 0.
22 mmol was added and the temperature of the reaction vessel was raised to 55 ° C. After introducing hydrogen so that the hydrogen gas concentration in the gas phase would be 2 mol%, 0.09 mmol of the titanium-containing polymer obtained by preliminary polymerization as titanium trichloride was added under a nitrogen gas atmosphere. After homopolymerization of propylene at 55 ° C. for 30 minutes, 0.22 mol of diethylaluminum (2,6-di-t-butylphenoxide) and 0.02 of butyl acetate were used.
37 mmol was added, and then the introduction of ethylene was started, and ethylene gas was supplied so that the concentration of ethylene gas in the gas phase was 10 mol%, and propylene and ethylene were polymerized at 55 ° C. for 120 minutes. After the completion of the polymerization, unreacted propylene, ethylene and hydrogen were removed, and then treated with propylenoxide and water to obtain a propylene ethylene block copolymer. The results are shown in Tables 1 and 2.

[0053]

[Table 1]

[0054]

[Table 2]

Examples 1 and 2 Pellets of the propylene block copolymers obtained in Production Examples 1-2 and 2 and magnesium 12-hydroxystearate (magnesium content 5.8% by weight, melting point 228 ° C., Excess 0.44 mol MgO (Ein Shinsei E
MS-6) (* 1 in the table) was mixed in the ratio shown in Table 3, and then melt-kneaded with a φ50 mm extruder to obtain pellets. The pellets were heated at 230 ° C. and 150 using a capillograph.
The melt viscosity in [s ^-1 ] was measured. Also, φ40 mm
Cylinder temperature 230 ° C, roll temperature 4 with T-die extruder
A sheet having a thickness of 200 μm was prepared under the condition of 0 ° C., and the appearance of the obtained sheet was evaluated as good, as ○, slightly melt fracture occurred as Δ, and severe melt fracture was evaluated as ×. The haze of the sheet was measured. The results are shown in Table 3.

Examples 3 to 9 Pellets of the propylene block copolymer obtained in Production Examples 1-1 and 1-2 and Production Examples 2, 3 and 4 and magnesium 12-hydroxystearate (magnesium content: 5. Table 3 shows a masterbatch (AP-500P manufactured by Eishin Kasei) containing 8 wt%, 9 wt% of melting point 228 ° C., 0.44 mol of MgO in excess) and 1 wt% of polyethylene glycol having an average molecular weight of 4000 (* 2 in the table). The mixture was mixed and melt-kneaded at the ratio shown in, and the test was conducted in the same manner as in Example 1. The results are shown in Table 3.

Comparative Example 1 A test was conducted in the same manner as in Example 1 using only the propylene block copolymer pellets obtained in Production Example 1-2. The results are shown in Table 3.

Comparative Example 2 The pellets of the propylene block copolymer obtained in Production Example 1-2 and magnesium 12-hydroxystearate (* A in the table) containing no excess metal were mixed in the proportions shown in Table 3. And melt-kneading, and the test was conducted in the same manner as in Example 1. The results are shown in Table 3.

Comparative Example 3 Pellets of the propylene block copolymer obtained in Production Example 1-2 and magnesium stearate (* B in the table) were mixed and melt-kneaded in the proportions shown in Table 3 to give Example 1. The test was conducted in the same manner. The results are shown in Table 3.

Comparative Example 4 Pellets of the propylene block copolymer obtained in Production Example 1-2 and liquid paraffin having a molecular weight of 1000 (* in the table)
C) was mixed and melt-kneaded in the proportions shown in Table 3 to obtain Example 1
The test was performed in the same manner as described above. The results are shown in Table 3.

Comparative Example 5 The pellets of the propylene block copolymer obtained in Production Example 1-2 and polyethylene glycol having a molecular weight of 5000 (* D in the table) were mixed and melt-kneaded at a ratio shown in Table 3,
A test was performed in the same manner as in Example 1. The results are shown in Table 3.

Comparative Example 6 Pellets of the propylene block copolymer obtained in Production Example 1-3 and the same metal soap (* 1 in the table) as in Example 1 were used and mixed at the ratio shown in Table 3. Then, the mixture was melt-kneaded and tested in the same manner as in Example 1. The results are shown in Table 3.

Comparative Example 7 The pellets of the propylene block copolymer obtained in Production Example 1-4 and the same metal soap (* 1 in the table) as in Example 1 were used and mixed at the ratio shown in Table 3. Then, the mixture was melt-kneaded and tested in the same manner as in Example 1. The results are shown in Table 3.

Comparative Example 8 A test was conducted in the same manner as in Example 1 using only the propylene block copolymer obtained in Comparative Production Example 1.
The results are shown in Table 3.

[0065]

[Table 3]

Claims (2)

[Claims] 1. A molecular weight distribution represented by the ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) is 4 or less, and the propylene-ethylene copolymer component is 30 to 30%.
100 parts by weight of a thermoplastic elastomer containing 99% by weight of a polypropylene-based elastomer as a main component, and an aliphatic carboxylic acid and an oxide or hydroxide of a Group II metal of the Periodic Table are contained in the Group II metal of the Periodic Table. A thermoplastic resin composition comprising 0.01 to 5 parts by weight of a metal soap obtained by reacting so as to exceed the theoretical amount. 2. The thermoplastic resin composition according to claim ^1, wherein the melt viscosity at a shear rate of 150 s ⁻¹ is 400 to 1200 Pa · s and the melt tension is 1 g or more.