JP2000119462A - Olefinic thermoplastic elastomer and preparation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide olefinic thermoplastic elastomers excellent in the balance of flexibility and tensile elongation at break and low temperature impact resistance, and a method for preparing the same. SOLUTION: Olefinic thermoplastic elastomers comprise a composition which is composed of (A) 10-50 wt.%, based on the entire composition, propylene homopolymer or copolymer component of propylene and other 2-8C α-olefins which has an isotacticity of not less than 85% and (B) 50-90 wt.%, based on the entire composition, copolymer component having, as the essential components, propylene and ethylene and composed of propylene and other 2-8C α-olefins with a xylene isolubles content at room temperature of from not less than 5 wt.% to less than 10 wt.%, based on the entire composition, a xylene soluble matter content at room temperature of from more than 40 wt.% to not more than 85 wt.%, based on the entire composition, and a content of the α-olefins other than propylene in the xylene soluble matter content at room temperature of not less than 40% and is prepared by the polymerization of component (B) after the polymerization of component (A).

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 excellent in balance between flexibility, tensile elongation at break and low-temperature impact resistance, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, a styrene-based, olefin-based, polyester-based, soft rubber-like material that does not require a vulcanizing step and has the same moldability as a thermoplastic resin.
Polyamide-based, polyurethane-based thermoplastic elastomers are attracting attention from the viewpoint of process rationalization and recycling,
It is widely used in the fields of automobile parts, home appliance parts, medical equipment parts, electric wires, and miscellaneous goods. Among them, crystalline propylene polymer resin and ethylene-propylene copolymer rubber or ethylene-propylene-non- Olefin-based thermoplastic elastomers composed of a mixture with olefin-based copolymer rubbers such as conjugated diene copolymer rubbers are attracting attention as economically advantageous materials because they are relatively inexpensive.

However, since this olefin-based thermoplastic elastomer is a mixture, it is easy for the rubber to be coarsely dispersed or unevenly dispersed, and therefore has a higher flexibility than other thermoplastic elastomers or conventional vulcanized rubber. In addition, there is a problem that the balance between elongation at break and tensile elongation at break and flexibility and low-temperature impact resistance are inferior.

On the other hand, in order to solve these problems, a method of producing a composition of a crystalline propylene polymer resin and an ethylene-propylene copolymer rubber by polymerization has been proposed. JP-A-3-20543
No. 9 discloses that (A) 10 to 60 parts by weight of a crystalline homopolymer or copolymer of propylene and (B) 10 to 10 parts by weight of a crystalline propylene-ethylene copolymer component insoluble in room temperature xylene.
40 parts by weight of (C) amorphous propylene soluble in room temperature xylene and having an ethylene content of 40 to 70% by weight.
An elastoplastic polypropylene composition produced by sequential polymerization comprising 30 to 60 parts by weight of an ethylene copolymer component,
JP-A-6-25367 discloses that (A) 10 to 50 parts by weight of a crystalline homopolymer or copolymer of propylene, and (B) a crystalline propylene-ethylene copolymer component 5 which is insoluble in xylene at room temperature. And (C) an amorphous propylene-ethylene copolymer component that is soluble in xylene at room temperature and has an ethylene content of less than 40% by weight.
Each elastoplastic polypropylene composition produced by sequential polymerization of parts by weight is described.

However, according to the study of the present inventors, regarding the former composition, when the room temperature xylene-insoluble crystalline propylene-ethylene copolymer component (B) is 10 to 40 parts by weight, flexibility is poor. Excellent balance of low-temperature impact resistance,
The balance between flexibility and elongation at break is inferior. On the other hand, in the latter composition, even if the component (B) of the crystalline xylene-insoluble crystalline propylene-ethylene copolymer component at room temperature is reduced to 5 to 20 parts by weight. When the ethylene content in the amorphous propylene-ethylene copolymer component of the room temperature xylene-soluble component (C) is less than 40% by weight, the balance between flexibility and tensile elongation at break is excellent. It was found that the balance between properties and low-temperature impact resistance was poor, and none of the compositions could improve the balance between flexibility and both tensile elongation at break and low-temperature impact resistance.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art. Therefore, the present invention has an excellent balance between flexibility, tensile elongation at break and low-temperature impact resistance. An object of the present invention is to provide an olefin-based thermoplastic elastomer and a method for producing the same.

[0007]

Means for Solving the Problems The present invention provides the following (A)
An olefinic thermoplastic elastomer comprising a component and a component produced by polymerizing the component (B) after the polymerization of the component (A), comprising the component (B). (A) an isotactic index of 85% or more,
Homopolymer of propylene or a copolymer component of propylene and another α-olefin having 2 to 8 carbon atoms; 10 to 50% by weight based on the whole composition (B) Propylene and ethylene are essential components A copolymer of propylene and another α-olefin having 2 to 8 carbon atoms, wherein the xylene insoluble content at room temperature is 5% by weight or more and less than 10% by weight with respect to the whole composition, and xylene at room temperature can be used. A copolymer component having a content of more than 40% by weight and not more than 85% by weight based on the whole composition, and having a content of α-olefins other than propylene in the room temperature xylene-soluble component of not less than 40% by weight; 50 to 90% by weight based on the whole composition

The present invention also relates to an olefin-based heat-generating composition comprising an organoaluminum compound and a solid component essentially comprising a titanium atom, a magnesium atom, a halogen atom, and an electron-donating compound. A method for producing a plastic elastomer.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION One of the components (A) constituting the olefin-based thermoplastic elastomer composition of the present invention is a propylene homopolymer or propylene having an isotactic index of 85% or more, It is composed of a copolymer with another α-olefin having 2 to 8 carbon atoms, and among them, a homopolymer of propylene is preferable, and the isotactic index is preferably 90% or more.

The component (A) usually comprises a crystalline component insoluble in xylene at room temperature and an amorphous component soluble in xylene at room temperature, and the former insoluble component substantially corresponds to the isotactic index. I do. When the isotactic index of the component (A) is less than the above range, the balance between flexibility and tensile elongation at break is poor as a thermoplastic elastomer of the composition.

Here, propylene and C 2 -C 8
Examples of other α-olefins in the copolymer with other α-olefins include ethylene, butene-1, 3
-Methylbutene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1 and the like. Among them, ethylene is preferable, and the propylene content in the copolymer is 85% by weight. It is preferable that this is the case.

The other component (B) constituting the composition of the olefinic thermoplastic elastomer of the present invention comprises propylene and ethylene as essential components, and propylene and another α-olefin having 2 to 8 carbon atoms. It consists of a copolymer with an olefin, and among them, a copolymer of propylene and ethylene is preferable.

Here, as the other α-olefin having 2 to 8 carbon atoms, the same as the above-mentioned component (A) can be used. The component (B) further includes 1,4
-Hexadiene, 5-methyl-1,5-hexadiene,
1,4-octadiene, cyclohexadiene, cyclooctadiene, dicyclopentadiene, 5-ethylidene-
Non-conjugated dienes such as 2-norbornene, 5-butylidene-2-norbornene and 2-isopropenyl-5-norbornene may be copolymerized in component (B) in an amount of 0.5 to 10% by weight. .

In the present invention, the copolymer of the component (B) comprises a crystalline component insoluble in xylene at room temperature and an amorphous component soluble in xylene at room temperature. 5% by weight or more based on the whole product 1
0 wt%, the room temperature xylene solubles are more than 40% by weight and 85% by weight or less based on the whole composition, and the content of α-olefins other than propylene in the room temperature xylene solubles is 40% by weight. % Is essential, and the xylene solubles at room temperature exceed 40% by weight with respect to the whole composition.
% By weight, and the content of α-olefins other than propylene in the xylene solubles at room temperature is 40 to 60% by weight.
Are each preferred.

If the room temperature xylene-insoluble content of the component (B) is less than the above range and the soluble content exceeds the above range, the molding processability of the thermoplastic elastomer of the composition will be inferior. When the soluble content is higher than the above range and the soluble content is lower than the above range, the balance between flexibility and tensile elongation at break is inferior. If the content of α-olefins other than propylene in the xylene-soluble matter at room temperature is less than the above range, the balance between flexibility and low-temperature impact resistance as a thermoplastic elastomer of the composition will be inferior. In this case, the balance between flexibility and tensile elongation at break tends to be inferior.

In the composition of the olefin thermoplastic elastomer of the present invention, the component (A) is 10 to 50% by weight, the component (B) is 50 to 90% by weight, and the component (A) is 30 to 50% by weight, wherein the component (B) is 50%
It is preferably in each case about 70% by weight.

If the component (A) is less than the above range and the component (B) is above the above range, the moldability of the composition as a thermoplastic elastomer is inferior. When the component (B) is less than the above range, it is difficult to obtain a composition having flexibility, and it is also difficult to improve the balance between flexibility and low-temperature impact resistance.

The olefinic thermoplastic elastomer of the present invention comprises a composition produced by polymerizing the component (A) after the polymerization of the component (A), and the catalyst used in the sequential polymerization is an organic compound. An aluminum compound;
It is composed of a titanium atom, a magnesium atom, a halogen atom, and a solid component essentially including an electron donating compound.

Here, as the organoaluminum compound, a compound represented by the general formula R ¹ _m AlX
_3-m (wherein, R ¹ is a hydrocarbon residue having 1 to 12 carbon atoms, X
Represents a halogen atom, and m is a number of 1 to 3. For example, trialkylaluminums such as trimethylaluminum and triethylaluminum, dialkylaluminum halides such as dimethylaluminum chloride and diethylaluminum chloride, alkylaluminum sesquichlorides such as methylaluminum sesquichloride and ethylaluminum sesquichloride, and methyl Examples thereof include alkylaluminum dihalides such as aluminum dichloride and ethylaluminum dichloride, and alkylaluminum hydrides such as diethylaluminum hydride.

Further, as a solid component essentially containing a titanium atom, a magnesium atom, a halogen atom, and an electron donating compound, a titanium compound which is also known in this kind of polymerization and which serves as a source of the titanium atom includes: General formula Ti (OR ² ) _4-n X _n (wherein R ² has 1 to 10 carbon atoms)
X represents a halogen atom, and n represents 0 to 4
Is the number of Among them, titanium tetrachloride, tetraethoxytitanium, tetrabutoxytitanium and the like are preferable, and as a magnesium compound serving as a source of a magnesium atom, for example, dialkylmagnesium, magnesium dihalide, Examples thereof include alkoxymagnesium and alkoxymagnesium halide, among which magnesium dihalide and the like are preferable. Incidentally, examples of the halogen atom include fluorine, chlorine, bromine and iodine. Among them, chlorine is preferable, and these are usually supplied from the titanium compound or the magnesium compound.
It may be supplied from other halogen sources such as aluminum halide, silicon halide and tungsten halide.

Examples of the electron donating compound include alcohols, phenols, ketones, aldehydes, carboxylic acids, oxygen-containing compounds such as organic acids or inorganic acids and derivatives thereof, ammonia, amines, nitriles, isocyanates and the like. Among them, nitrogen-containing compounds and the like, among which inorganic acid esters, organic acid esters, organic acid halides and the like are preferable,
Silicates, phthalates, cellosolve acetates, phthalic halides and the like are more preferred, and the compounds represented by the general formula R ³
R ⁴ _3-p Si (OR ⁵ ) _p (wherein R ³ has ³ to 2 carbon atoms)
0, preferably 4 to 10 branched aliphatic hydrocarbon residues,
Or a cyclic aliphatic hydrocarbon residue having 5 to 20 carbon atoms, preferably 6 to 10 carbon atoms, and R ⁴ is a branched or straight-chain aliphatic hydrocarbon residue having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms. R ⁵ represents an aliphatic hydrocarbon residue having 1 to 10, preferably 1 to 4 carbon atoms, and p is a number of 1 to 3. )), For example, t-butyl-methyl-dimethoxysilane, t-butyl-methyl-diethoxysilane, cyclohexyl-methyl-dimethoxysilane, cyclohexyl-methyl-diethoxysilane and the like are particularly preferable.

In the method for producing an olefinic thermoplastic elastomer of the present invention, in the first step, propylene or propylene and another α-olefin having 2 to 8 carbon atoms are supplied, and the temperature is increased in the presence of the catalyst. 50 to 150 ° C, preferably 50 to 100 ° C, partial pressure of propylene 0.5 to 4.5M
The propylene homopolymer or the propylene-α-olefin copolymer is polymerized under the conditions of Pa, preferably 1.0 to 3.5 MPa, to produce the component (A). And supplying propylene and ethylene or propylene and ethylene and an α-olefin having 4 to 8 carbon atoms in the presence of the catalyst at a temperature of 50 to 150 ° C., preferably 50 to 100 ° C .; Each pressure is 0.3 to 4.5 MPa, preferably 0.5 to 3.5 M
Under the condition of Pa, propylene-ethylene copolymer, or
The propylene-ethylene-α-olefin copolymer is polymerized to produce the component (B).

The polymerization at this time may be any of a batch system, a continuous system, and a semi-batch system. The first stage polymerization is preferably carried out in a gas phase or a liquid phase, particularly preferably in a gas phase. ,
Also, the second stage polymerization is preferably carried out in the gas phase,
The residence time at each stage is 0.5 to 10 hours, preferably 1 to 5 hours.

In order to impart fluidity by eliminating stickiness and the like to the powder particles of the composition produced by the above method, after the polymerization of the component (A) in the first step, the ( Before or during the polymerization of the component (B), an active hydrogen-containing compound is added to the solid component of the catalyst in an amount of 10 to titanium atoms.
It is preferably added in an amount of 0 to 1000 times the molar amount and 2 to 5 times the molar amount of the organic aluminum compound of the catalyst.

Here, the active hydrogen-containing compound includes, for example, water, alcohols, phenols, aldehydes, carboxylic acids, acid amides, ammonia, amines and the like.

The olefin-based thermoplastic elastomer of the present invention comprising the composition produced by the above-mentioned method is used in accordance with JIS.
230 ° C, load 21.18 according to K7210
The melt flow rate measured in N is 0.1-5 g / 10
The density measured by the underwater displacement method according to JIS K7112 is about 0.87 to 0.88 g / cm ³ , and the flexural modulus measured at a temperature of 23 ° C. according to JIS K7203 is 400 MPa or less. , For example, 100 to 36
0 MPa, tensile elongation at break measured at a temperature of 23 ° C. in accordance with JIS K7113 is 700% or more, and in an Izod impact test in accordance with JIS K7110, no break is shown even at a temperature of −40 ° C. Become.

The component (A) and the component (B) are essential components in the olefin-based thermoplastic elastomer of the present invention, but are usually compounded to impart processability and flexibility to the thermoplastic elastomer. A rubber softener to be used may be blended. The rubber softener is particularly preferably a mineral oil-based softener, which is generally a mixture of an aromatic ring, a naphthene ring, and a paraffin chain, wherein the number of carbon atoms in the paraffin chain is all carbon atoms. A paraffinic system which accounts for 50% or more of the total number of carbon atoms,
Naphthenes which occupy 40% to 40%, and aromatics whose aromatic rings account for 30% or more of the total number of carbon atoms are classified into paraffins. In the present invention, paraffins are particularly preferable.

The olefin-based thermoplastic elastomer of the present invention further comprises fillers such as various resins and rubbers, glass fibers, calcium carbonate, silica, talc, mica, clay and the like.
Antioxidants, light stabilizers, antistatic agents, flame retardants, dispersants,
Various additives such as a neutralizing agent and a slip agent, pigments such as carbon black, and the like may be blended as necessary.

In the presence of a crosslinking agent such as an organic peroxide and a crosslinking aid, the mixture is melted using a kneading device such as a mixing roll, a kneader, a Banbury mixer, a Brabender plastograph, or a single or twin screw extruder. By kneading, the thermoplastic elastomer obtained by partially cross-linking the component (B) can be obtained.

The olefin-based thermoplastic elastomer of the present invention can be obtained as a simple substance or as a laminate with other materials by various molding methods applied to the thermoplastic elastomer, such as extrusion molding, injection molding, and compression molding. It is shaped into a desired shape to obtain a molded body.

[0031]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention. The production examples of the olefin-based thermoplastic elastomer used in the following Examples and Comparative Examples are shown below.

Preparation of solid component catalyst 20 liters of dehydrated and deoxygenated n-heptane were introduced into a 50-liter tank equipped with a stirrer and purged with nitrogen. Then, 4 mol of magnesium chloride and tetrabutoxytitanium 8
After reacting at 95 ° C. for 2 hours with the introduction of a mole, the temperature was lowered to 40 ° C., and methylhydropolysiloxane (viscosity of 20
After 480 ml of centistokes were introduced and allowed to react for another 3 hours, the reaction solution was taken out and the resulting solid component was washed with n-heptane.

Subsequently, 15 liters of dehydrated and deoxygenated n-heptane were introduced into the tank using the tank equipped with a stirrer, and then 3 mol of the obtained solid component was introduced in terms of magnesium atom. A mixture obtained by adding 8 mol of silicon chloride to 25 ml of n-heptane was introduced at 30 ° C. over 30 minutes, the temperature was raised to 90 ° C., and the reaction was carried out for 1 hour. Was washed with n-heptane.

Subsequently, 5 liters of dehydrated and deoxygenated n-heptane were introduced into the tank using the tank equipped with a stirrer, and then the titanium-containing solid component 250 obtained above was added.
g, 750 g of 1,5-hexadiene, 130 ml of t-butyl-methyl-dimethoxysilane, 10 ml of divinyldimethylsilane, and 225 g of triethylaluminum were brought into contact with each other at 30 ° C. for 2 hours, and then the reaction solution was taken out. , N-heptane to obtain a solid component catalyst. The resulting solid component catalyst was 1,5
-The prepolymerization amount of hexadiene was 2.97 g per titanium-containing solid component.

Olefinic thermoplastic elastomer composition
In a first-stage reactor having an inner volume of 550 liters, a temperature of 70 ° C.
And propylene and a pressure of about 3.2 MPa.
Triethylaluminum and polymer formation rate is 30
kg / hour of the solid component catalyst was continuously supplied, and further, hydrogen as a molecular weight controlling agent was continuously supplied to carry out polymerization in a liquid phase (first stage polymerization). ).

Subsequently, the produced polymer is introduced into a second-stage reactor having an internal volume of 1900 liters via a propylene purge tank, and the produced polymer is produced at a temperature of 60 ° C. and a pressure of 3.0 MPa. A solid component catalyst that continuously supplies propylene and ethylene according to the composition ratio in the polymer, further continuously supplies hydrogen as a molecular weight controlling agent, and supplies an active hydrogen compound in the first stage. The polymerization was carried out in the gas phase by supplying 200 moles per mole of titanium atoms and 2.5 moles per mole of triethylaluminum, and the resulting polymer was continuously transferred to a vessel. Then, the reaction was stopped by introducing nitrogen gas containing water (second stage polymerization).

Examples 1 to 3 and Comparative Examples 1 to 3 With respect to the compositions of Examples and Comparative Examples produced by the above-described methods, the weight ratio of the component (A) to the whole composition was calculated by the following method. Component (A): the weight ratio of the xylene-insoluble and soluble components at room temperature to the entire composition, the isotactic index of component (A), the weight ratio of component (B) to the entire composition, and component (B) At room temperature xylene insolubles and solubles relative to the total composition in the composition, and α-
The content of olefin (ethylene) is measured respectively,
The results are shown in Table 1.

The component (A), the component (B), and each component
Of the xylene insoluble and soluble components at room temperature
Weight ratio (B) The weight ratio of the component (B)
(%). ] Was calculated from the weight of the obtained polymer composition and the weights of propylene and ethylene supplied in the second stage polymerization. From this, the weight ratio of the component (A) to the entire composition [this is defined as A (%). ]
It was calculated by “100-B”.

On the other hand, the polymer produced after the first stage polymerization was sampled, and 1 g of the polymer was placed in 300 ml of xylene in an oil bath, dissolved under stirring at a boiling point of xylene of 140 ° C., and after 1 hour, stirring was continued. While within 10 hours
After the temperature was lowered to 0 ° C., the mixture was transferred to a quenching oil bath, rapidly cooled to 23 ± 2 ° C. while stirring, and allowed to stand for 20 minutes or more. The precipitate was naturally filtered with filter paper, the filtrate was evaporated to dryness using an evaporator, further dried under reduced pressure at 120 ° C. for 2 hours, and then allowed to cool to room temperature, and its weight was measured. Weight ratio to the amount of the component (A) soluble in xylene soluble at room temperature [this is defined as a ₂ (%). ] Was calculated. In the same manner, the weight ratio of the xylene-soluble component at room temperature in the whole produced polymer composition [this is defined as A ₂ + B ₂ (%). ] Was measured and calculated.

From the above, it is possible to use xylene at room temperature in the component (A).
The weight ratio of the dissolved component to the whole composition [this is A_Two(%)
And ] To "a_Two× A ”and the component (A)
Ratio of room temperature xylene insolubles in the composition to the total composition
[This is A₁(%). ] To "A-A_TwoBy
And the weight percentage of the xylene-soluble component at room temperature in the component (B).
If [this is B_Two(%). ] To "(A_Two+ B_Two)
-A_TwoAt room temperature in component (B).
The weight ratio of the dissolved component to the whole composition [B ₁(%)
And ] To “BB_Two”
Was.

Isotactic Index of Component (A)
It was measured as a Soxhlet extraction residue with sn-heptane. (B) Ethylene Content in Room Temperature Xylene Soluble Content of Component Ethylene content in room temperature xylene soluble content of the polymer after the first stage polymerization [this is referred to as E _A2 (%). 〕,as well as,
Ethylene content in the soluble xylene at room temperature of the resulting polymer composition [this is defined as E _{A2 + B2} (%). ] Were respectively measured by infrared spectroscopy, and were calculated by the following equations. _{[E A2 + B2 -E A2 × (} A 2 / A 2 + B 2) ] / (B ₂ /
A ₂ + B ₂ )

With respect to the obtained composition, the melt flow rate and the density were measured by the following methods, and the results are shown in Table 1. Melt flow rate Based on JIS K7210, temperature 230 ° C, load 2
It was measured at 1.18N. The density was measured by an underwater displacement method in accordance with JIS K7112.

On the other hand, tetrakis [methylene-3- (3 ', 5'-di-t-)-tetrakis [methylene-3- (3', 5'-di-t-) was added to the powder particles of the olefin-based thermoplastic elastomer comprising the obtained composition as an antioxidant.
Butyl-4'-hydroxyphenyl) propionate]
Methane (“IRGANOX 1010” manufactured by Ciba-Geigy Japan) and tris (2,4-di-t-butylphenyl) phosphite (“IRGAFOS 168” manufactured by Ciba-Geigy Japan),
As a neutralizing agent, zinc stearate was added in an amount of 0.05 part by weight based on 100 parts by weight of the elastomer composition.
5)) and melted and kneaded at a set temperature of 200 ° C. to form pellets. Then, using an injection molding machine (“N-100” manufactured by Nippon Steel Works, Ltd.) with a mold clamping pressure of 100 t, the temperature below the hopper was 1
75 ° C, cylinder temperature 220 ° C, nozzle temperature 210
A test piece sample was injection-molded at a temperature of 40 ° C. and a mold temperature of 40 ° C., and the hardness, flexural modulus, tensile properties, and impact strength were measured by the following methods.

Hardness According to JIS K7215, type D durometer hardness was measured. The flexural modulus was measured at a temperature of 23 ° C. in accordance with JIS K7203. In accordance with JIS K7113, using a No. 2 type test piece,
At a temperature of 23 ° C. and a tensile speed of 50 mm / min, the tensile yield point strength, tensile break strength, and tensile break elongation were measured. Impact strength According to JIS K7110, temperature -30 ° C and -40
At, the notched Izod impact strength was measured.

[0045]

[Table 1]

[0046]

According to the present invention, it is possible to provide an olefin-based thermoplastic elastomer excellent in balance between flexibility, tensile elongation at break and low-temperature impact resistance, and a method for producing the same.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shigeo Mizukami 1 Tohocho, Yokkaichi-shi, Mie Mitsubishi Chemical Corporation Yokkaichi Office (72) Inventor Shiro Goto 3-chome, Shimodori, Kurashiki-shi, Okayama Pref. F-term in Mizushima Office (reference) 4J002 BB121 BB141 BB201 BN061 EC076 EH026 EH096 EH136 EX036 EZ006 FD206 GB01 GN00 GQ00 GQ01 4J028 AA01A AB01A AC06A BA00A BA01A BA01B BB00A CB01A CB01A CB01A CB01A CB01A CB01A CB01A CB01A EC02 ED01 ED02 FA04 GA14 4J100 AA02Q AA03P AA04Q AA07Q AA16Q AA17Q AA19Q AR16R AR18R AS11R AU21R CA01 CA04 CA05 DA40 FA09 FA10

Claims (7)

[Claims] 1. An olefin comprising the following components (A) and (B), and a composition produced by polymerizing the component (B) after the polymerization of the component (A). -Based thermoplastic elastomer. (A) an isotactic index of 85% or more,
Homopolymer of propylene or a copolymer component of propylene and another α-olefin having 2 to 8 carbon atoms; 10 to 50% by weight based on the whole composition (B) Propylene and ethylene are essential components A copolymer of propylene and another α-olefin having 2 to 8 carbon atoms, wherein the xylene insoluble content at room temperature is 5% by weight or more and less than 10% by weight with respect to the whole composition, and xylene at room temperature can be used. A copolymer component having a content of more than 40% by weight and not more than 85% by weight based on the whole composition, and having a content of α-olefins other than propylene in the room temperature xylene-soluble component of not less than 40% by weight; 50 to 90% by weight based on the whole composition 2. The olefinic thermoplastic elastomer according to claim 1, wherein the component (A) is a propylene homopolymer. 3. The thermoplastic olefin elastomer according to claim 1, wherein the component (B) is a copolymer of propylene and ethylene. 4. The content of α-olefins other than propylene in the xylene-soluble component at room temperature in the component (B) is from 40 to 40.
The olefin-based thermoplastic elastomer according to any one of claims 1 to 3, which is 60% by weight. 5. The composition according to claim 1, wherein the organic aluminum compound and a solid component containing titanium, magnesium, halogen and an electron donating compound as a catalyst are successively used. A method for producing an olefin-based thermoplastic elastomer, comprising polymerizing. 6. After the polymerization of the component (A), before or during the polymerization of the component (B), the active hydrogen-containing compound is used in an amount of 100 to 1000 times the molar amount of titanium atoms in the solid component of the catalyst. And 2 for the organoaluminum compound of the catalyst.
The method for producing an olefin-based thermoplastic elastomer according to claim 5, wherein the olefin-based thermoplastic elastomer is added in an amount of from about 5 to about 5 moles. 7. The production of the thermoplastic olefin elastomer according to claim 5, wherein the polymerization of the component (A) is carried out in a gas phase or a liquid phase, and the polymerization of the component (B) is carried out in a gas phase. Method.