JPH07149999A - Thermoplastic elastomer composition and injection-molded product thereof - Google Patents

Abstract

PURPOSE:To provide a thermoplastic elastomer composition which is improved in rubber elasticity, flexibility, thermal resistance, ozone resistance and injection moldability, rarely suffers from paraffin oil bleeding, and has characteristics similar to those of vulcanized rubber. CONSTITUTION:A thermoplastic elastomer composition comprises 100 pts.wt. in total of components A and B and 5-140 pts.wt. of component C, where component A is a hydrogenated product of a styrene-conjugated diene block copolymer (40-80wt.%), component B is paraffin oil (60-20wt.%), and component C is a crystalline 1-butene resin. An injection-molded article is prepared from this thermoplastic elastomer composition.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is excellent in rubber elasticity, flexibility, heat resistance, ozone resistance and injection moldability, has little bleeding of paraffinic oil, and has properties close to those of vulcanized rubber. The thermoplastic elastomer having (hereinafter, "TP
E ". ) A composition and an injection-molded article comprising the same.

[0002]

2. Description of the Related Art In recent years, TPE, which is a soft material having rubber elasticity that does not require a vulcanization process and has moldability similar to that of thermoplastic resin, has been used in automobile parts, home electric appliance parts, medical equipment parts, food equipment parts. It is used in various fields such as electric wires, electric goods, and sundries, and is attracting attention. As such TPE, various constituent component-based TPEs such as olefin-based, urethane-based, polyester-based, and styrene-based are currently developed and commercially available.

However, in terms of quality, these TPEs have not reached the level of widely used vulcanized rubber. For example, olefinic TPE is relatively cheap,
Although it has excellent heat resistance and weather resistance, it is inferior in flexibility and even the most flexible one is JIS-A hardness (JIS-K6301).
Of about 55, which is still too hard as compared with JIS-A hardness of 45 or more of the vulcanized rubber. Similarly, polyester-based TPE and urethane-based TPE are the most flexible ones on the market and have a JIS-A hardness of 70.
However, it is not suitable for the use of vulcanized rubber.
In addition, styrene-based TPEs such as styrene / butadiene / styrene block copolymer (SBS) and styrene / isoprene / styrene block copolymer (SIS) are
Although it has excellent flexibility as compared with PE, it has problems in heat aging resistance (heat stability), weather resistance, ozone resistance, etc. because it has a double bond in the polymer.

As a styrenic elastomer in which double bonds in the polymer are reduced or eliminated, heat resistance, weather resistance and ozone resistance obtained by hydrogenating a block copolymer of styrene and a conjugated diene are improved. There is a derivative, styrene-based TPE used as a molding material by mixing this with polypropylene resin, oil, inorganic filler, etc.
It has excellent flexibility and molding processability compared to PE, but it is still inferior in rubber elasticity and heat resistance to vulcanized rubber, and at the same time, oil bleeding is a drawback. . This is particularly remarkable in injection molded articles.

[0005]

DISCLOSURE OF THE INVENTION The object of the present invention is to provide rubber elasticity and heat resistance close to vulcanized rubber without impairing the excellent flexibility, weather resistance, ozone resistance and injection moldability of styrene-based TPE. Another object of the present invention is to provide a styrene-based TPE having scratch resistance and less bleeding of paraffin-based oil, and an injection-molded article made of the styrene-based TPE.

[0006]

[Means for Solving the Problems]

[Summary of the Invention] The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, each of paraffinic oil and crystalline butene-1 resin was added to the hydrogenated product of the styrene / conjugated diene block copolymer. The present invention has been completed by finding that the above object can be achieved by mixing a specific amount.

That is, the present invention provides a total of 100 parts by weight of 40 to 80% by weight of hydrogenated styrene / conjugated diene block copolymer (component A) and 60 to 20% by weight of paraffinic oil (component B), And a crystalline butene-1 resin (ingredient C) in an amount of 5 to 140 parts by weight.

Another aspect of the present invention is that "styrene.
Hydrogenated product of conjugated diene block copolymer (component A) 4
0-80% by weight and paraffinic oil (component B) 60
To 20% by weight in total of 100 parts by weight, and 5 to 140 parts by weight of the crystalline butene-1 resin (component C), an injection molded article composed of a TPE composition ".

Usually, in a TPE based on a hydrogenated product of a styrene / conjugated diene block copolymer, polypropylene is generally added for the purpose of adjusting hardness and molding processability, but in the present invention, , Crystalline butene-1
One of the features is that a specific amount of resin is blended. The melting point of crystalline butene-1 resin is around 130 ° C, while the melting point of polypropylene is as high as around 160 ° C. In addition, since the flexural modulus of polypropylene is higher than that of polypropylene, it has hitherto been considered that addition of polypropylene can provide TPE having heat resistance and rubber elasticity. However,
The present inventors have found that by using a crystalline butene-1 resin in combination with paraffinic oil instead of polypropylene, T
The rubber elasticity and heat resistance of PE can be greatly improved,
Moreover, they have found that the bleeding of paraffin oil in the TPE injection molded product can be reduced.
I must say this is something other than nothing.

[Detailed Description of the Invention] [1] Constituents (Component A) Hydrogenated Product of Styrene / Conjugated Diene Block Copolymer The hydrogenated product of the styrene / conjugated diene block copolymer used in the present invention includes: For example, hydrogenated styrene / butadiene block copolymer (styrene / ethylene / butylene / styrene copolymer (hereinafter abbreviated as “SEBS”)), hydrogenated styrene / isoprene block copolymer (styrene / styrene An ethylene / propylene / styrene copolymer (hereinafter abbreviated as “SEPS”) or a mixture thereof can be preferably used.

The hydrogenated products of these styrene / conjugated diene block copolymers have a weight average molecular weight of 10,000 to 10,000.
800,000, preferably 30,000 to 500,0
00, particularly preferably 100,000 to 400,000
Is preferable from the viewpoint of heat resistance and injection moldability,
The styrene content is 5 to 50% by weight, preferably 1
It is preferably 0 to 45% by weight and has a hydrogenation rate of 95% or more from the viewpoint of weather resistance.

Here, the "weight average molecular weight" is a polystyrene equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions. (Conditions) Equipment: 150C ALC / GPC (MILL
Column: AD80M / S (manufactured by Showa Denko KK) Column: 3 Solvents: o-dichlorobenzene Temperature: 140 ° C Flow rate: 1 ml / min Injection volume: 200 μl Concentration: 2 ml (antioxidant 2,6-di- t-butyl-p
-Added 0.2% by weight of phenol. FOXBO for concentration detection
Wavelength 3. by IR spectrophotometer MIRAN 1A made by RO company.
Measured at 42 μm. )

As a method for producing a hydrogenated product of these styrene / conjugated diene block copolymers, for example, the method described in Japanese Patent Publication No. 40-23798 can be used to prepare styrene in an inert solvent using a lithium catalyst or the like. A conjugated diene block copolymer was synthesized and then described in, for example, JP-B-42-8704, JP-B-43-6636, JP-A-59-133203, and JP-A-60-79005. Depending on the method, a method of hydrogenating in the presence of a hydrogenation catalyst in an inert solvent can be mentioned.

(Component B) Paraffinic Oil The paraffinic oil used in the present invention has a kinematic viscosity at 40 ° C. of 20 to 800 cst, preferably 50 to 600 c.
st, pour point is 0 to -40 ° C, preferably 0 to -30
Oils having a temperature of 200 ° C. and a flash point (COC) of 200 to 400 ° C., preferably 250 to 350 ° C. are suitably used.
The oil is generally a mixture of three members of an aromatic ring, a naphthene ring and a paraffin ring, and the paraffin chain carbon number occupies 50% of the total carbon number of the paraffin oil and the naphthene ring carbon number of 30 to 30. Those having 45% are called naphthenic oils, and those having an aromatic carbon number of more than 30% are called aromatic oils. If an oil other than the paraffinic oil is used, the remarkable effect of the present invention cannot be obtained.

(Component C) Crystalline Butene-1 Resin The crystalline butene-1 resin used in the present invention is synthesized from butene-1 monomer which may contain a small amount (20% by weight or less) of other comonomer such as ethylene. With the crystalline resin
Density is 0.890 to 0.925 g / cm ³ , preferably 0.8
93 to 0.923 g / cm ³ , particularly preferably 0.900 to
0.920 g / cm ³ ; MFR (190 ° C., 2.16 kg load) 0.01 to 1,000 g / 10 min, preferably 0.1 to
50 g / 10 minutes; crystallinity of 30% or more, preferably 3
0-70%; weight average molecular weight 10,000-3,000
50,000, preferably 50,000 to 2,500,0
00 is preferably used.

(Other Ingredients) Optional Ingredients In addition to the above-mentioned essential ingredients, other optional ingredients may be added to the TPE composition of the present invention in accordance with various purposes within a range that does not significantly impair the effects of the present invention. Examples of optional components include antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizing agents, lubricants, lubricants, antifogging agents, antiblocking agents, slip agents, dispersants, colorants, and hardeners. Various additives such as flame retardants, antistatic agents, conductivity-imparting agents, cross-linking agents, metal deactivators, molecular weight regulators, antibacterial agents, optical brighteners, thermoplastic resins other than essential components, elastomers, fillers. And the like, and any of these may be used alone or in combination. Here, as the thermoplastic resin other than the essential components, for example, polyethylene,
Examples thereof include ethylene / vinyl acetate copolymers, ethylene / acrylic acid ester copolymers, polyphenylene ethers, polyamides, polyesters, polyoxymethylene, and polymethylmethacrylate. In terms of high temperature compression set, it is preferable not to use polypropylene or polystyrene resin. Further, as the elastomer as an optional component, for example, ethylene / propylene copolymer rubber (EPM),
Ethylene / propylene / non-conjugated diene copolymer rubber (E
PDM), ethylene / butene copolymer rubber, ethylene /
Ethylene elastomers such as propylene / butene copolymer rubber; styrene elastomers such as styrene-butadiene copolymer rubber and styrene-isoprene copolymer rubber; and polybutadiene. Further, as the filler, there are glass fiber, hollow glass sphere, carbon fiber, talc, calcium carbonate, mica, potassium titanate fiber and the like.

[Compounding amount ratio] The blending ratio of the above essential components used in the present invention is as follows. That is, styrene
Hydrogenated product of conjugated diene block copolymer (component A) 4
0 to 80% by weight, preferably 40 to 70% by weight, particularly preferably 40 to 60% by weight and paraffinic oil (component B) 60 to 20% by weight, preferably 60 to 34% by weight, particularly preferably 60 to 40% by weight. The crystalline butene-1 resin (component C) is added to 5 to 140 parts by weight, preferably 8 to 120 parts by weight, particularly preferably 1 to 100 parts by weight in total.
It is mixed in a proportion of 0 to 100 parts by weight.

When the amount of the component A is too small (that is, the amount of the component B is too large), the rubber elasticity and heat resistance of TPE are inferior and the paraffinic oil easily bleeds.
If the amount is too large (that is, the amount of component B is too small), the flexibility and injection moldability of TPE are unsatisfactory. Particularly, when the component B is not blended, the injection moldability is extremely poor, and only TPE having poor rubber elasticity, flexibility and heat resistance can be obtained. On the other hand, if the component C is too small, the injection moldability of the TPE will be poor, while if the component C is too large, the flexibility of the TPE will be lost.

[Production of TPE Composition] The TPE composition of the present invention can be produced by a usual method of mechanically melt-kneading the above components. As the melt kneader, for example, a single-screw or twin-screw extruder, a Brabender plastograph, a Banbury mixer, a kneader blender, a roll and the like can be used. The TPE composition obtained has a JIS-A hardness of preferably 20 to 98, particularly preferably 30 to 95.

The TPE composition is subjected to molding such as injection molding (insert molding, two-color molding, sandwich molding, gas injection molding), extrusion molding, blow molding and the like to be processed into a molded body. Among the molded products, the effect of the present invention is remarkably exhibited particularly in the injection molded product. Applications include industrial parts such as automobile parts and home appliances parts, food packaging materials, medical instruments, medical equipment parts, furniture parts, daily necessities, etc.

[0021]

EXAMPLES Raw materials used in Examples and Comparative Examples,
And the evaluation method is as shown below. <1> Raw materials

TPE-1 : J composed of the following components
IS-A hardness 74 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 40 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil; 60 parts by weight Density 0.908 g / cm ³ , MFR (190 ° C, 2.16 kg load) 4.0 g / 10 minutes, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness (ASTM -D2240) 50 polybutene-1 (polybutylene); 43 parts by weight

TPE-2 : J composed of the following components
IS-A hardness 89 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 40 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil; 60 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 minutes, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 100 parts by weight

TPE-3 : J consisting of the following components
IS-A hardness 47 TPE. SEBS with a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 45 parts by weight 40 ° C. kinematic viscosity 381.6 cst, pour point -15 ° C., flash point 300 ° C., weight average molecular weight 746, ring analysis 0% paraffinic Oil: 55 parts by weight Density 0.908 g / cm ³ , MFR 1.0 g / 10 min, crystallinity 45%, weight average molecular weight 570,000, Shore D hardness 50 polybutene-1; 11 parts by weight

TPE-4 : J consisting of the following components
IS-A hardness 78 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 60 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil: 40 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 min, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 43 parts by weight

TPE-5 : J consisting of the following components
IS-A hardness 70 TPE. SEPS having a weight average molecular weight of 238,000 and a styrene content of 35% by weight; 40 parts by weight, 40 ° C., a kinematic viscosity of 381.6 cst, a pour point of -15 ° C., a flash point of 300 ° C., a weight average molecular weight of 746, and a ring analysis of 0% paraffinic. Oil: 60 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 min, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 43 parts by weight

TPE-6 : J consisting of the following components
IS-A hardness 77 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 40 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil: 60 parts by weight Ethylene content 12% by weight, flexural modulus (JIS-K7203) 4,300 kg / cm ² , MFR (230 ° C, 2.16 kg load) 6 g / 10 min propylene-ethylene block copolymer 43 parts by weight

TPE-7 : J consisting of the following components
IS-A hardness 25 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 40 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil; 60 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 minutes, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 3 parts by weight

TPE-8 : J consisting of the following components
IS-A hardness 98 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 40 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil: 60 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 minutes, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 900 parts by weight

TPE-9 : J consisting of the following components
IS-A hardness 60 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 30 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil; 70 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 min, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 43 parts by weight

TPE-10 : J consisting of the following components
IS-A hardness 90 TPE. SEBS having a weight average molecular weight of 246,000 and a styrene content of 33% by weight; 90 parts by weight, 40 ° C kinematic viscosity of 381.6 cst, pour point of -15 ° C, flash point of 300 ° C, weight average molecular weight of 746, paraffin type of ring analysis of 0% Oil: 10 parts by weight Density 0.908 g / cm ³ , MFR 4.0 g / 10 min, crystallinity 45%, weight average molecular weight 330,000, Shore D hardness 50 polybutene-1; 130 parts by weight

<2> Evaluation Method All of the measurement samples used in the following evaluation methods are in-line screw type small injection molding machines (IS
90B) injection pressure 500kg / cm ² , injection temperature 2
120mm × 80m molded at 10 ℃ and mold temperature of 40 ℃
It was obtained by lateral punching of a m × 2 mm thick sheet. (1) JIS-A hardness (-): JIS-K6301 ( 2) MFR (g / 10 min): JIS-K6758 (230 ℃ , 2.16kg load) (3) 100% stress (kg / cm ^2): JIS-K6301 (4) Compression set (%): JIS-K6301 (70 ° C × 22 hours and 100 ° C × 22 hours) (5) Paraffin oil bleed: After allowing the sample to stand at room temperature for 30 days The presence or absence of stickiness on the surface was visually evaluated. (6) Injection moldability: evaluated as good when there is no short shot during molding of the measurement sample sheet and when there is no significant visual defect such as flow mark on the sheet.

<3> Examples and Comparative Examples 0.1 parts by weight of a phenolic antioxidant (trade name "Irganox 1010") was further added to 100 parts by weight of the total composition shown in Tables 1 and 2. Then, it was melt-kneaded at a temperature of 190 ° C. by a twin-screw extruder having L / D33 and a cylinder diameter of 45 mm to obtain TPE composition pellets. The pellets were injection-molded as described above to obtain a sheet, which was subjected to the above evaluation. The evaluation results are shown in Tables 1 and 2.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

According to the present invention, TPE having excellent rubber elasticity, flexibility, heat resistance, ozone resistance and injection moldability, less bleeding of paraffinic oil, and having properties close to vulcanized rubber. Remarkable effects such as obtaining a composition and an injection-molded article thereof are exhibited.

[Procedure amendment]

[Submission date] May 31, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Usually, in a TPE based on a hydrogenated product of a styrene / conjugated diene block copolymer, polypropylene is generally added for the purpose of adjusting hardness and molding processability, but in the present invention, , Crystalline butene-1
One of the features is that a specific amount of resin is blended. The melting point of crystalline butene-1 resin is around 130 ° C, while the melting point of polypropylene is as high as around 160 ° C. In addition, since the flexural modulus of polypropylene is higher than that of polypropylene, it has hitherto been considered that addition of polypropylene can provide TPE having heat resistance and rubber elasticity. However,
The present inventors have found that by using a crystalline butene-1 resin in combination with paraffinic oil instead of polypropylene, T
The rubber elasticity and heat resistance of PE can be greatly improved,
Moreover, they have found that the bleeding of paraffin oil in the TPE injection molded product can be reduced.
I must say that this is completely unexpected.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Here, the "weight average molecular weight" is a polystyrene equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions. (Conditions) Equipment: 150C ALC / GPC (MILL
Column: AD80M / S (manufactured by Showa Denko KK) Column: 3 Solvents: o-dichlorobenzene Temperature: 140 ° C Flow rate: 1 ml / min Injection volume: 200 μl Concentration: 2 mg / ml (antioxidant 2,6- 0.2% by weight of di-t-butyl-p-phenol was added, and the concentration was detected as FO.
Measured with an infrared spectrophotometer MIRAN 1A manufactured by XBORO at a wavelength of 3.42 μm. )

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

(Component B) Paraffinic Oil The paraffinic oil used in the present invention has a kinematic viscosity at 40 ° C. of 20 to 800 cst, preferably 50 to 600 c.
st, pour point is 0 to -40 ° C, preferably 0 to -30
Oils having a temperature of 200 ° C. and a flash point (COC) of 200 to 400 ° C., preferably 250 to 350 ° C. are suitably used.
The oil is generally a mixture of three members of an aromatic ring, a naphthene ring and a paraffin ring, and a paraffin chain carbon number occupies 50% or more of the total carbon number of a paraffin oil and a naphthene ring carbon number of 30. Those having a carbon content of up to 45% are called naphthenic oils, and those having an aromatic carbon number of more than 30% are called aromatic oils, and are distinguished from each other. If an oil other than the paraffinic oil is used, the remarkable effect of the present invention cannot be obtained.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

(Component C) Crystalline Butene-1 Resin The crystalline butene-1 resin used in the present invention is a butene-1 monomer which may contain a small amount (20% by weight or less) of other comonomer such as ethylene and propylene. A crystalline resin synthesized from, having a density of 0.890 to 0.925 g / cm ³ , preferably 0.893 to 0.923 g / cm ³ , and preferably 0.9.
900 to 0.920 g / cm ³ ; MFR (190 ° C., 2.1
6 kg load) is 0.01 to 1,000 g / 10 minutes, preferably 0.1 to 500 g / 10 minutes; crystallinity is 30% or more, preferably 30 to 70%; weight average molecular weight is 10,000.
~ 3,000,000, preferably 50,000-2,
Those of 500,000 are preferably used.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

(Other Ingredients) Optional Ingredients In addition to the above-mentioned essential ingredients, other optional ingredients may be added to the TPE composition of the present invention in accordance with various purposes within a range that does not significantly impair the effects of the present invention. Examples of optional components include antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizing agents, lubricants, lubricants, antifogging agents, antiblocking agents, slip agents, dispersants, colorants, and hardeners. Various additives such as flame retardants, antistatic agents, conductivity-imparting agents, cross-linking agents, metal deactivators, molecular weight regulators, antibacterial agents, optical brighteners, thermoplastic resins other than essential components, elastomers, fillers. And the like, and any of these may be used alone or in combination. Here, as the thermoplastic resin other than the essential components, for example, polyethylene,
Examples thereof include ethylene / vinyl acetate copolymers, ethylene / acrylic acid ester copolymers, polyphenylene ethers, polyamides, polyesters, polyoxymethylene, and polymethylmethacrylate. In terms of high temperature compression set, it is preferable not to use polypropylene or polystyrene resin. Further, as the elastomer as an optional component, for example, ethylene / propylene copolymer rubber (EPM),
Ethylene / propylene / non-conjugated diene copolymer rubber (E
PDM), ethylene / butene copolymer rubber, ethylene /
Ethylene elastomers such as propylene / butene copolymer rubber; ethylene elastomers such as styrene / butadiene copolymer rubber and styrene / isoprene copolymer rubber; and polybutadiene. Further, as the filler, there are glass fiber, hollow glass sphere, carbon fiber, talc, calcium carbonate, mica, potassium titanate fiber and the like.

Claims (8)

[Claims] 1. A total of 100 parts by weight of a hydrogenated product of styrene / conjugated diene block copolymer (component A) 40 to 80% by weight and paraffin oil (component B) 60 to 20% by weight, and crystalline butene. -1 Resin (Component C) 5-1
A thermoplastic elastomer composition comprising 40 parts by weight. 2. The composition according to claim 1, wherein the conjugated diene is butadiene or isoprene. 3. A paraffinic oil having a kinematic viscosity of 2 at 40.degree.
0-800 cst, pour point 0--40 ° C and flash point 20
The composition according to claim 1, which is an oil of 0 to 400 ° C. 4. The crystalline butene-1 resin has a density of 0.890.
~ 0.925g / cm ³The resin according to claim 1, which is
Composition. 5. The composition according to claim 1 or 4, wherein the crystalline butene-1 resin is a resin having a weight average molecular weight of 10,000 to 3,000,000. 6. A total of 100 parts by weight of a hydrogenated product of styrene / conjugated diene block copolymer (component A) 40 to 80% by weight and paraffinic oil (component B) 60 to 20% by weight, and crystalline butene. -1 Resin (Component C) 5-1
An injection-molded article composed of a thermoplastic elastomer composition, characterized by comprising 40 parts by weight. 7. The paraffinic oil has a kinematic viscosity of 2 at 40.degree.
0-800 cst, pour point 0--40 ° C and flash point 20
The injection-molded article according to claim 6, which is an oil of 0 to 400 ° C. 8. The injection-molded article according to claim 6, wherein the crystalline butene-1 resin is a resin having a weight average molecular weight of 10,000 to 3,000,000.