JPH10298363A - Thermoplastic elastomer resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an olefin thermoplastic elastomer resin composition excellent in flexibility and suitable for forming process which needs molten tensile strength. SOLUTION: This thermoplastic elastomer resin composition is composed of (A) 50-99 wt.% an olefin thermoplastic elastomer and (B) 50-1 wt.% a crosslinked body having the characteristics (d) shown below prepared by crosslinking an ethylene-α-olefin copolymer having the characteristics (a) to (c). (a) The carbon number of α-olefin: >=4 and <=20. (b) The content of α-olefin: >65 wt.% and >=95 wt.%. (c) Crystal melting peaks to be determined by a differential scanning calorimeter: not observed. (d) The ratio of melt flow rate(MFRa) before crosslinking to that (MFRb) after crosslinking: 1<MFRa/MFRb<=10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an olefin-based thermoplastic elastomer resin composition having excellent flexibility and moldability.

[0002]

2. Description of the Related Art Polypropylene (PP) is a matrix,
In recent years, demand for olefin-based thermoplastic elastomers (TPO) having a rubber as a dispersed phase has been rapidly growing due to advantages such as easy molding and recyclability. However, since TPO has a low melt tension, it is not suitable for calender molding, blow molding, film molding and the like, and its molding method has been limited.

[0003] In order to improve the melt tension of TPO,
A technique of adding branched low density polyethylene (LDPE) is often used. However, its modifying effect is small, and further improvement has been desired. Also, the addition of LDPE has a serious problem that the flexibility of the olefin-based thermoplastic elastomer is significantly impaired, and a molding modifier having excellent flexibility has been strongly desired.

[0004]

The object of the present invention is to provide an olefin-based thermoplastic elastomer resin composition which is excellent in flexibility and suitable for molding and processing requiring melt tension.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, completed the present invention. That is, the present invention relates to an olefin-based thermoplastic elastomer (A) of 50 to 99% by weight and the following (a) to
The present invention relates to a thermoplastic elastomer resin composition comprising 50 to 1% by weight of a crosslinked product (B) having the characteristic (d) obtained by crosslinking an ethylene / α-olefin copolymer having the characteristic (c). is there.

(A) carbon number of α-olefin: 4 or more 2
0 or less (b) α-olefin content: greater than 65% by weight and 9
5% by weight or less (c) Crystal melting peak by differential scanning calorimeter: not observed (d) Melt flow rate (MFRa) of ethylene / α-olefin copolymer elastomer before crosslinking and ethylene / α after crosslinking The ratio of the melt flow rate (MFRb) of the olefin-based copolymer elastomer is 1 <MF
Ra / MFRb ≦ 10.

The details will be described below.

The olefin-based thermoplastic elastomer (A) used in the present invention is not particularly limited, and a commercially available material may be used. It is generally known that the olefin-based thermoplastic elastomer is a composite material containing polypropylene and rubber as main components. (For example, C.I.
P. By Radder Thermoplastic El
astromers from Rubber-Plas
tic Blends, Ellis Horwood
(1990), N.M. R. Edited by Legge et al., Thermo
plasticElastomers, Hanser,
New York (1987), Yasushi Oyanagi New development of thermoplastic elastomers, Industrial Research Committee (1993), etc. As the polypropylene resin constituting the olefin thermoplastic elastomer, a propylene homopolymer and an ethylene content of 0.5 to 12 are used. Propylene / ethylene / α-olefin terpolymer having an ethylene content of 0.5 to 12% by weight and an α-olefin content of 0.5 to 20% by weight, ethylene content Is 1 to 60% by weight of impact polypropylene,
Examples thereof include crystalline polypropylene resins having a syndiotactic structure, and one or more of these are used.

Olefinic thermoplastic elastomer (A)
The rubber constituting ethylene, propylene rubber,
Ethylene / propylene / diene rubber, butyl rubber, chlorinated butyl rubber, natural rubber, isoprene rubber, chloroprene rubber, chlorinated polyethylene, butadiene rubber, styrene / butadiene rubber, acrylate copolymer rubber,
Silicone rubber, acrylonitrile butadiene rubber,
Examples thereof include urethane rubber, norbornene rubber, and ethylene / vinyl acetate copolymer, and one or more of these are used in combination.

The olefin-based thermoplastic elastomer (A) used in the present invention contains, as necessary, an organic or inorganic filler, a heat stabilizer, a softener, a lubricant, a crystal nucleating agent, polyethylene, polybutene and the like. You may. Also,
The production method is not limited, and it is produced by a dynamic crosslinking method, a simple blending method, a reactor method, or the like.

The method for producing the crosslinked product (B) of the ethylene / α-olefin copolymer used in the present invention is not particularly limited, and various catalysts such as a titanium catalyst, a vanadium catalyst or a metallocene catalyst may be used. Ethylene produced
The α-olefin copolymer is used after crosslinking. Among them, it is preferable to use a metallocene-based catalyst which can easily obtain a copolymer having a narrow composition distribution.

The crosslinked product (B) of the ethylene / α-olefin copolymer used in the present invention is represented by the following (a) to (c).
Obtained by crosslinking an ethylene / α-olefin copolymer having the following characteristics: The details of the characteristics (a) to (c) are described below.

(A) α-olefin having 4 or more carbon atoms 2
0 or less ethylene / α-olefin copolymer.
Examples of the α-olefin include 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene,
-Heptene, 1-octene, 1-nonene, 1-decene,
1-undecene, 1-dodecene, 1-tridecene, 1-
Tetradecene, 1-pentadecene, 1-hexadecene,
Examples thereof include 1-heptadecene, 1-octadecene, 1-nonadecene, and 1-eicosene, and one or more of these are used. Above all, 1-
Butene, 1-heptene, 1-hexene, 1-octene and the like are preferred. α-olefin is propylene,
If the carbon number is 21 or more, the thermoplastic elastomer obtained by blending with the olefin-based thermoplastic elastomer (A) after crosslinking may be unsuitable for molding requiring melt tension.

(B) The α-olefin content is more than 65% by weight and 95% by weight or less, preferably 70% by weight or more and 9% by weight or less.
5% by weight or less. α-olefin content is 65% by weight
If the content is less than or greater than 95% by weight, the thermoplastic elastomer obtained by blending with the olefinic thermoplastic elastomer (A) after crosslinking may be unsuitable for molding requiring melt tension.

(C) No crystal melting peak is observed by a differential scanning calorimeter (abbreviated as DSC). When an ethylene / α-olefin copolymer showing a crystal melting peak is used, a thermoplastic elastomer obtained by blending with an olefin thermoplastic elastomer (A) after crosslinking is unsuitable for molding requiring melt tension. There is fear.

The crosslinked product (B) of the ethylene / α-olefin copolymer has the following property (d).

(D) Melt flow rate (MFRa) of ethylene / α-olefin copolymer elastomer before crosslinking and melt flow rate (MFRb) of ethylene / α-olefin copolymer elastomer after crosslinking
Is 1 <MFRa / MFRb ≦ 10. Where M
If FRa / MFRb ≦ 1, there is a possibility that the molding is not suitable for molding requiring melt tension, and MFRa / MFRb> 10
If so, a gel may be generated. However, as the MFR, a value measured under the conditions of 190 ° C. and a load of 2.16 kgf is used.

A non-conjugated diene monomer may be copolymerized with the ethylene / α-olefin copolymer. Examples of the non-conjugated diene monomer include 1,4-pentadiene, 1,4-hexadiene, 4-methyl-1,5-heptadiene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, and 5-isobutylene. Propenyl-2
-Norbornene, 2,5-norbonadiene, 1,6-cyclooctadiene, 2-ethylene-2,5-norbonadiene, 2-isopropenyl-2,5-norbonadiene,
Dicyclopentadiene, 1,6-octadiene, 1,7
Esters of octadiene, tricyclopentadiene and dihydrodicyclopentadienyloxyethylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and the like, but are not limited thereto. Not something. One or two or more of these are used.

When a non-conjugated diene monomer is used,
It is desirable that the copolymerization amount is 0 or more and 50 or less, preferably 30 or less in iodine value. If the iodine value exceeds 50, the moldability of the obtained olefin-based thermoplastic elastomer resin composition may deteriorate. The iodine value can be measured by a known method (for example, “Rubber Test Method”, page 657, edited by The Japan Rubber Association, (196)
3)).

The ethylene / α-olefin copolymer has a number average molecular weight of 5,000 to 100,000 before crosslinking.
It is preferable that it is 0 or less because handling is easy.

The crosslinked ethylene / α-olefin copolymer (B) used in the present invention is obtained by crosslinking the ethylene / α-olefin copolymer with a peroxide or an electron beam.

In the case of crosslinking by adding a peroxide, the amount of the peroxide is not limited and may be appropriately determined in order to obtain the desired processability. From 20 ppm to 50,000 ppm, and preferably 20,000 ppm or less. If the content is less than 20 ppm, the thermoplastic elastomer obtained by blending with the olefin-based thermoplastic elastomer (A) may be unsuitable for molding requiring melt tension, and may be 50,000 pp.
If it exceeds m, the surface of the obtained thermoplastic elastomer may be extremely sticky.

As the peroxide used for crosslinking the ethylene / α-olefin copolymer, t-butyl peroxide, di (t-butyl) peroxide, t-butylperoxy-isopropyl carbonate, t-butyl Cumyl peroxide, t-butyl peroxybenzoate, dicumyl peroxide, cumene peroxide,
Benzoyl peroxide, cyclohexanone peroxide, diisopropylbenzene peroxide, 2,
5-dimethylhexane-2,5-diperoxide,
2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,2,5-dimethyl-2,5-di (t
-Butyl) peroxyhexane, n-butyl-4,4-
Bis (t-butylperoxy) hexane, 3,3,5-
Trimethylhexanoyl peroxide, 2,4-dichlorobenzoyl peroxide, p-chlorobenzoyl peroxide, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane,
2'-bis (t-butylperoxy) -p-diisopropylbenzene, 1,3-bis (t-butylperoxy-
Isopropyl) benzene and the like, and these may be used alone or in combination of two or more. It is also possible to use a crosslinking accelerator or a co-crosslinking agent in combination.

When the crosslinking of the ethylene / α-olefin copolymer is carried out by using an electron beam, it is desirable that the irradiation amount of the electron beam be 1 kGray or more and 100 kGray or less. If it is less than 1 kGray, the thermoplastic elastomer obtained by blending with the olefin-based thermoplastic elastomer (A) may be unsuitable for molding requiring melt tension, and if it exceeds 100 kGray, the obtained thermoplastic elastomer may be sticky. There is.

Olefinic thermoplastic elastomer (A)
(B) of ethylene and α-olefin copolymer
Is 50 / 50- by weight ratio of A / B.
99/1. If the blending ratio is out of this range, it may be unsuitable for molding processing requiring melt tension.

The thermoplastic elastomer resin composition of the present invention may further contain carbon black, calcium carbonate, mica, talc, silica, barium sulfate, calcium sulfate, kaolin, clay, pyroferrite, etc., if necessary.
Bentonite, sericanite, zeolite, nepheline sinite, attapulgite, wollastonite, ferrite, calcium silicate, magnesium carbonate, dolomite, antimony trioxide, titanium oxide, iron oxide, molybdenum disulfide, graphite, gypsum, glass beads, glass powder Inorganic fillers such as glass balloons, glass fibers, quartz and quartz glass, and organic or inorganic pigments can also be blended. Furthermore, crystal nucleating agents, clarifying agents, anti-blocking agents, release agents, antistatic agents, slip agents,
Anti-fogging agents, lubricants, heat stabilizers, UV stabilizers, light stabilizers, weathering stabilizers, foaming agents, fungicides, rust inhibitors, ion trapping agents, flame retardants, flame retardant assistants, etc. as required May be added.

It is also possible to blend other resins. In this case, a compatibilizer may be added as a further component. Such other resins include linear high-density polyethylene, linear low-density polyethylene, branched low-density polyethylene, ethylene-vinyl acetate copolymer (EV
A), ethylene / ethyl acrylate copolymer, poly (1-butene), polyamide, polyester, poly (4
-Methyl-1-pentene), styrene / isoprene / styrene block copolymer, styrene / ethylene butene /
Examples include a styrene block copolymer, a styrene / ethylene propylene / styrene block copolymer, and a styrene / butadiene / styrene block copolymer.

The crosslinked product (B) of the polyolefin-based thermoplastic elastomer (A) and the ethylene / α-olefin-based copolymer of the present invention can be blended by any method. In order to improve dispersibility, it is preferable to perform melt blending using a kneader, a roll, a Banbury mixer, a single screw or twin screw extruder, or the like. Further, crosslinking of the ethylene / α-olefin-based copolymer may be carried out by introducing a peroxide into the melt blend with the olefin-based thermoplastic elastomer (A).

The thermoplastic elastomer of the present invention is a material suitable for molding requiring a melt tension, such as film, vacuum, compressed air, blow, and calender.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples, but these are only illustrative and not restrictive. Various measurements and ethylene and α in the examples
-The synthesis of the olefin copolymer was carried out by the following method.

(Measurement of α-Olefin Content of Ethylene / α-Olefin Copolymer) Calculated by ¹³ C-NMR spectrum (JNM GX400 manufactured by JEOL Ltd.) using o-dichlorobenzene as a solvent at 100 MHz. .

(Measurement of Molecular Weight) Using o-dichlorobenzene as a solvent, the number average molecular weight was calculated in terms of polyethylene by gel permeation chromatography (150C type GPC manufactured by Millipore Co., Ltd.) at 140 ° C.

(Measurement of MFR) JIS K7210 (1
976) under the conditions of 190 ° C. and 2.16 kgf.

Synthesis Example 1 of Ethylene / α-Olefin Copolymer In a 5 liter autoclave, 1000 ml of toluene was added.
And 1-butene (500 ml) were added, and the temperature was raised to 40 ° C. Further, ethylene was introduced so that the total pressure became 8 kg / cm ² . Next, 10 m of toluene was placed in another reaction vessel.
1, methylaluminoxane 5 mmol, (dimethyl (t
-Butylamido) (tetramethyl-η5-cyclopentadienyl) silane) dichloride titanium (5 μmol) was added, and the mixture was stirred for 20 minutes and then introduced into an autoclave to start polymerization. This polymerization is carried out at a total pressure of 8k.
g / cm ² , and ethylene was continuously introduced.
Performed at 0 ° C. for 30 minutes.

After completion of the polymerization, the polymer was washed with a large amount of ethanol and dried at 60 ° C. for 12 hours under reduced pressure. As a result, ethylene 1- having a 1-butene content of 72% by weight was used.
44 g of a butene copolymer was obtained. Number average molecular weight 10800
0, density 0.864 g / cm ³ , MFRa 5.7 g / cm ³
It was 10 minutes, and no crystal melting peak was observed by DSC measurement.

Example 1 To the ethylene / 1-butene copolymer obtained in Synthesis Example 1 was added 5000 ppm of dicumyl peroxide and a hindered phenol-based stabilizer (trade name Irganox 1) as a heat stabilizer.
010, manufactured by Ciba-Geigy) and 1000 ppm of a phosphorus-based stabilizer (trade name: Irgafos 168, manufactured by Ciba-Geigy), and calcium stearate 5 as a lubricant.
000 ppm, and 20 mL at 60 rpm using a Labo Plastomill (manufactured by Toyo Seiki Seisakusho) having an inner volume of 30 ml.
The mixture was kneaded at 0 ° C. for 3 minutes to obtain a crosslinked product of an ethylene / 1-butene copolymer (MFRb = 2.0 g / 10 minutes). 3.75 g of this crosslinked product and 21.25 g of an olefin-based thermoplastic elastomer (trade name: Santoprene 101-64, manufactured by AES Japan Co., Ltd.) at 200 rpm at 60 rpm using a 30 cc labo plast mill at 5 rpm. Melt blended for minutes. Thereafter, the obtained thermoplastic elastomer resin composition was pressurized at 230 ° C. for 10 minutes using a press molding machine, and then cooled at 30 ° C. to obtain a molded product having a thickness of 1 mm. This press-formed product was finely cut to obtain a sample for measuring the melt tension.

Example 2 The ethylene / 1-butene copolymer obtained in Synthesis Example 1 was added to 25
Irradiation with an electron beam of kGray was performed to obtain a crosslinked product of an ethylene / 1-butene copolymer (MFRb = 1.9 g / 10
Minutes). 3.75 g of this crosslinked product was mixed with an olefinic thermoplastic elastomer (trade names Santoprene 101-64, A.I.
E. FIG. S. Japan, 21.25 g, hindered phenol-based stabilizer (trade name: Irganox 1010, manufactured by Ciba-Geigy), and phosphorus-based stabilizer (trade name: Irgafos 168, manufactured by Ciba-Geigy) are each 2000 pp
m, 5000 ppm of calcium stearate as lubricant
Was melt-blended for 5 minutes at 200 ° C. in a Labo Plastomill having an internal volume of 30 ml at 60 rpm. Thereafter, the obtained thermoplastic elastomer resin composition was pressurized at 230 ° C. for 10 minutes using a press molding machine, and then cooled at 30 ° C.
m was obtained. This press-formed product was finely cut to obtain a sample for measuring the melt tension.

Synthesis of ethylene / α-olefin copolymer
Example 2 600 ml of toluene was placed in a 5-liter autoclave.
And 900 ml of 1-hexene was added and the temperature was raised to 40 ° C. Sa
In addition, the total pressure is 4kg / cm^TwoLead ethylene to become
Entered. Next, 10 ml of toluene and methyl
Lualuminoxane 3 mmol, diphenylmethane (sic
Lopentadienyl-1-fluorenyl) zirconiumdi
3 μmol of chloride is added, and this mixed solution is added for 20 minutes.
After stirring, the mixture was introduced into an autoclave and polymerization was started.
Was. This polymerization has a total pressure of 4 kg / cm. ^TwoEtch to keep
Len was introduced continuously and run at 40 ° C. for 90 minutes.

After the completion of the polymerization, the polymer was washed with a large amount of ethanol and dried at 60 ° C. for 12 hours under reduced pressure. As a result, ethylene / 1 having a 1-hexene content of 78% by weight was used.
85 g of a hexene copolymer was obtained. Number average molecular weight 980
00, density 0.860 g / cm ³ , MFRa 6.2 g
/ 10 minutes, and no crystal melting peak could be observed by DSC measurement.

Example 3 In the same manner as in Example 1 except that the ethylene / 1-hexene copolymer obtained in Synthesis Example 2 was used instead of the ethylene / 1-butene copolymer used in Example 1. Then, a sample was obtained (MFRb of crosslinked product = 2.1 g / 10 min).

Example 4 In the same manner as in Example 2 except that the ethylene / 1-butene copolymer obtained in Synthesis Example 2 was used instead of the ethylene / 1-butene copolymer used in Example 2. Then, a sample was obtained (MFRb of crosslinked body = 2.0 g / 10 min).

Synthesis Example 3 of Ethylene / α-Olefin Copolymer Toluene, 2200 m
1, 5-ethylidene-2-norbornene 50 ml, 1-
Add 750 ml of hexene, and stir the internal temperature to 80
The temperature was raised to ° C. Further, ethylene was introduced so that the total pressure became 8 kg / cm ² . Next, 10 ml of toluene, 3 μmol of diphenylmethylene (cyclopentadienyl) (fluorenyl) hafnium dichloride synthesized by a known method, 3 mmol of triisobutylaluminum, and 3.6 μmol of dimethylanilinium pentafluorophenylborate were added to another reaction vessel. After stirring this mixed solution for 20 minutes, it was introduced into an autoclave and polymerization was started. This polymerization was carried out at 80 ° C. for 10 minutes while maintaining the total pressure at 8 kg / cm ² by continuously introducing ethylene.

After completion of the polymerization, the polymer was washed with a large amount of ethanol and dried at 80 ° C. under reduced pressure for 12 hours. As a result, the 1-hexene content was 45 mol%, and the iodine value was 1
5. 107 g of an ethylene / 1-hexene / 5-ethylidene-2 norbornene copolymer elastomer having an MFRa of 1.0 g / 10 min was obtained. No crystal melting peak was observed by DSC measurement.

Example 5 A method similar to that of Example 1 was used except that the ethylene / 1-butene copolymer obtained in Synthesis Example 3 was used instead of the ethylene / 1-butene copolymer used in Example 1. Performed to obtain a sample. (MFRb of crosslinked product = 0.15 g / 10 min) Comparative Example 1 Only the olefin-based thermoplastic elastomer used in Example 1 was used as a comparative sample.

Comparative Example 2 A sample was obtained in the same manner as in Example 2 except that the ethylene / 1-butene copolymer obtained in Synthesis Example 1 was used without crosslinking.

Comparative Example 3 Instead of the crosslinked ethylene / 1-butene copolymer used in Example 1, a branched low-density polyethylene (trade name: Petrocene 286, manufactured by Tosoh Corporation, MFR 1.5 g / 10
Min., 190 ° C., 2.16 kg load), and a sample was obtained in the same manner as in Example 2.

Comparative Example 4 Ethylene having a propylene content of 75% by weight was synthesized in the same manner as in Synthesis Example 1 except that 1-butene was replaced with propylene in place of the ethylene / 1-butene copolymer used in Example 1. A sample was obtained in the same manner as in Example 1 except that the propylene copolymer was used. The number average molecular weight of the ethylene / propylene copolymer used here was 64000, and DSC
Was not observed. (MFRa
/MFRb=1.8/0.8) Comparative Example 5 In place of the ethylene / 1-butene copolymer used in Example 2, the procedure was performed except that the ethylene / propylene copolymer used in Comparative Example 4 was used. A sample was obtained in the same manner as in Example 2.

Synthesis Example 4 of Ethylene / α-Olefin Copolymer 500 ml of toluene and 1000 ml of 1-butene were added to a 5-liter autoclave, and the temperature was raised to 40 ° C. Further, ethylene was introduced so that the total pressure became 4 kg / cm ² . Next, 10 m of toluene was placed in another reaction vessel.
1, 3 mmol of methylaluminoxane, 3 μmol of dimethylsilanediylbis (2-methylindenyl) zirconium dichloride synthesized by a known method,
After stirring this mixed solution for 20 minutes, it was introduced into an autoclave and polymerization was started. This polymerization has a total pressure of 4 kg /
cm ² , ethylene was continuously introduced at 40 ° C.
For 30 minutes.

After the completion of the polymerization, the polymer was washed with a large amount of ethanol and dried at 60 ° C. for 12 hours under reduced pressure. As a result, ethylene 1- having a 1-butene content of 96% by weight was used.
54 g of a butene copolymer was obtained. Number average molecular weight 7600
0, density 0.882 g / cm ³ , MFRa 5.5 g /
It was 10 minutes, and the crystal melting point measured as the main peak by DSC was 45 ° C.

Comparative Example 6 The procedure of Example 1 was repeated, except that the ethylene / 1-butene copolymer obtained in Synthesis Example 4 was used instead of the ethylene / 1-butene copolymer used in Example 1. A sample was obtained. (MF
Rb = 5.5 g / 10 min) Comparative Example 7 Ethylene with a 1-butene content of 53% by weight which was synthesized in the same manner as in Synthesis Example 2 except that 1-hexene was replaced with 1-butene.
A sample was obtained in the same manner as in Example 1 except that the 1-butene copolymer was used. The density of the ethylene / 1-butene copolymer used here was 0.859 g / cm ³ and the number average molecular weight was 60000, and no crystal melting peak by DSC was observed. (MFRa / MFRb = 6.0 / 2.
0) The samples obtained in Examples 1 to 5 and Comparative Examples 1 to 7 were evaluated by the following methods. Table 1 shows the results.

(Surface Hardness) Shore-A hardness was measured by stacking ten 1 mm thick plates. Measurement temperature is 23
° C and according to JIS K6301 (1975).

(Melt Tension) The melt tension, which is a measure of film, vacuum, compressed air, and blow moldability, was evaluated using a capillograph (manufactured by Toyo Seiki Seisaku-sho, Ltd.). Barrel temperature 190 ° C,
The inner diameter of the barrel is 9.55 mm, and the L / D of the die is 60/1.
The test was performed at a cylinder descending speed of 10 mm / min and a take-up speed of 1.5 m / min.

As can be seen from Table 1, since the thermoplastic elastomer resin composition of the present invention has a high melt tension, drawdown is greatly suppressed, and it becomes a material excellent in blow, film, vacuum and pressure forming properties. It is also a material with excellent flexibility. .

[0054]

As described above, the thermoplastic elastomer resin composition of the present invention is excellent in flexibility and moldability.

[0055]

[Table 1]

Claims (1)

[Claims] 1. An olefinic thermoplastic elastomer (A)
50 to 99% by weight of a crosslinked product (B) having the characteristic (d) obtained by crosslinking an ethylene / α-olefin copolymer having the following characteristics (a) to (c): 50 to 1% by weight (A) carbon number of α-olefin: 4 or more and 20 or less (b) α-olefin content: greater than 65% by weight and 9
5% by weight or less (c) Crystal melting peak by differential scanning calorimeter: not observed (d) Melt flow rate (MFRa) of ethylene / α-olefin copolymer before crosslinking and ethylene / α- after crosslinking The ratio of the melt flow rate (MFRb) of the olefin copolymer is 1 <MFRa / MFRb ≦ 10.