JP2000044691A - Production of thermoplastic elastomer composition and thermoplastic elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable production process for a thermoplastic elastomer composition that has desired performances, for example, excellent rubber elasticity, good oil retention, small permanent compression set and the like by means of a twin screw kneader in high productivity. SOLUTION: In the production of a thermoplastic elastomer composition by kneading a thermoplastic polymer containing at least 1 wt.% of a thermoplastic elastomer and oil by means of a twin screw kneader, the thermoplastic polymer is brought into contact with at least a part of the oil, then kneaded in the twin screw kneader whereby the objective thermoplastic elastomer composition is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing a thermoplastic elastomer composition and a thermoplastic elastomer composition. More specifically, the present invention provides a thermoplastic elastomer composition having desired performance, such as excellent rubber elasticity, good oil holding properties, and small compression set, with good productivity using a twin-screw kneader. The present invention relates to a method for producing the composition in a stable manner, and a thermoplastic elastomer composition having the above performance obtained by the production method.

[0002]

2. Description of the Related Art Thermoplastic elastomers are materials having both the properties of rubber and the workability of resins, and are classified into styrene, olefin, vinyl chloride, polyurethane, polyester, polyamide, and fluorine. system,
Silicones and the like are known. Among them, styrene-based and olefin-based elastomers are typical, and they are used for various purposes, such as automobile parts, OA equipment, home appliances, sports equipment, footwear and shoe soles, vibration-proof materials, sound-proof materials, miscellaneous goods, and electric wires.・ It is used as a covering material for cables. Such a thermoplastic elastomer is used alone depending on the application, or used in combination with a thermoplastic resin,
Alternatively, a softener such as oil is blended and used for the purpose of lowering the hardness.

As described above, when other components such as a thermoplastic resin and oil are blended with a thermoplastic elastomer, generally, a single-screw kneader, a twin-screw kneader, a roll, a Banbury mixer, a Brabender, and a kneader are used. And melt kneading using a kneader such as a high shear mixer. Among these kneaders, the twin-screw kneader provides superior mixing and dispersion compared to the single-shaft kneader, ensures transport promotion, and does not change the kneading efficiency depending on the type and conditions of the resin. It has advantages such as low local retention, small drive motor capacity, and high energy efficiency, and has been awarded for general thermoplastic resin kneading.
By the way, when kneading oil or resin to the thermoplastic elastomer compound, in order to achieve a sufficient dispersion state,
The ratio of the kneading zone to the total length of the screw of the kneader may be increased, or a twin-screw kneader having a large ratio (L / D) between the screw length (L) and the cylinder diameter (D) of the twin-screw kneader may be used. The length of the kneading zone itself may be increased. However, unfavorable situations such as a large shear force being applied to the polymer in the kneading zone, cutting of the polymer molecules, lowering the rubber elasticity of the compound, and failing to obtain a thermoplastic elastomer composition having desired physical properties. And the screw shape and screw configuration are limited, and the screw rotation speed and the amount of extrusion per time must be suppressed.

[0004]

SUMMARY OF THE INVENTION Under such circumstances, the present invention provides a thermoplastic elastomer, particularly a styrene-based thermoplastic elastomer and oil, or a mixture of the elastomer, thermoplastic resin and oil using a twin-screw kneader. Even when kneaded, the thermoplastic elastomer composition having desired properties, such as the elastomer molecules being not cut, having excellent rubber elasticity, having good oil retaining properties, and having a small compression set, even when kneaded. It is an object of the present invention to provide a method for producing a product stably with good productivity.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, a thermoplastic polymer containing at least 1% by weight of a thermoplastic elastomer, preferably a styrene-based thermoplastic elastomer. It has been found that the object can be achieved by bringing the compound into contact with at least a part of the oil to be blended in advance and kneading the compound in a twin-screw kneader. The present invention has been completed based on such findings. That is, the present invention produces a thermoplastic elastomer composition by kneading a thermoplastic elastomer, preferably a thermoplastic polymer compound containing at least 1% by weight of a styrene-based thermoplastic elastomer, and an oil with a biaxial kneader. In providing a method for producing a thermoplastic elastomer composition, characterized in that the thermoplastic polymer compound is brought into contact with at least a part of oil to be blended, and then kneaded in a biaxial kneader. is there. The present invention also provides a thermoplastic elastomer composition produced by the above method.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing a thermoplastic elastomer composition of the present invention, a thermoplastic polymer compound containing at least 1% by weight of a thermoplastic elastomer, an oil,
That is, thermoplastic elastomer and oil, or thermoplastic elastomer 1% by weight or more and thermoplastic resin 99% by weight
The following mixtures and oils are used: As the thermoplastic elastomer, a styrene-based thermoplastic elastomer is preferable, and the styrene-based thermoplastic elastomer is
The copolymer elastomer is composed of at least one polymer block mainly composed of a vinyl aromatic compound and at least one polymer block mainly composed of a conjugated diene compound. Examples of the styrene-based thermoplastic elastomer include, for example, a block copolymer of a crystalline polyethylene obtained by hydrogenating a block copolymer of polybutadiene and a butadiene-styrene random copolymer and an ethylene / butylene-styrene random copolymer. Coalescing,

A block copolymer of polybutadiene and polystyrene, a block copolymer of polyisoprene and polystyrene, or a block copolymer of polybutadiene or an ethylene-butadiene random copolymer and polystyrene are obtained by hydrogenation. For example, a diblock copolymer of crystalline polyethylene and polystyrene, a triblock copolymer of styrene-ethylene / butylene-styrene (SEBS), and a triblock copolymer of styrene-ethylene / propylene-styrene (SEP)
S), among others, styrene-ethylene / butylene-styrene block copolymer or styrene-ethylene / propylene-styrene block copolymer. As these styrene-based thermoplastic elastomers, those having a number average molecular weight of 30,000 or more are preferable. In particular, at least one of a polymer block mainly containing a vinyl aromatic compound and a polymer mainly containing a conjugated diene compound are mentioned. A hydrogenated block copolymer obtained by hydrogenating a block copolymer composed of at least one of the united blocks and having a number average molecular weight of 30,000 or more is preferred. The upper limit of the number average molecular weight is not particularly limited, but is usually about 400,000.

That is, at least one (one segment) of a polymer block mainly composed of a vinyl aromatic compound
And those obtained by hydrogenating a block copolymer consisting of at least one polymer block mainly composed of a conjugated diene compound, but preferably at least two polymer blocks mainly composed of a vinyl aromatic compound, A block copolymer having at least one polymer block mainly composed of a conjugated diene compound (for example, styrene-butadiene-styrene block copolymer, styrene-isoprene-
A hydrogenated block copolymer obtained by hydrogenating a styrene block copolymer or the like is more preferred. Also, as a hydrogenated block copolymer similar to this hydrogenated block copolymer,
At least one of a polymer block mainly composed of a modified vinyl aromatic compound to which a molecular unit containing a carboxylic acid group or a maleic anhydride group or a derivative group thereof is bonded, and at least one of a polymer block mainly composed of a conjugated diene compound. A hydrogenated block copolymer obtained by hydrogenating one block copolymer is also preferable.

The content of the amorphous styrene block in the block copolymer is 10 to 70% by weight, preferably 15% by weight.
It is desirable that the amount is in the range of -60% by weight. The glass transition temperature (Tg) of the amorphous styrene block is 60 ° C.
The temperature is preferably 80 ° C. or higher. As the polymer of the portion connecting the amorphous styrene blocks at both ends, an amorphous polymer is also preferable, for example, an ethylene-butylene copolymer, a butadiene polymer,
Examples thereof include isoprene polymers, and these blocks or random copolymers may be used. In the present invention, the thermoplastic elastomer may be used alone, or two or more kinds may be used in combination. In the method of the present invention, if desired, a thermoplastic resin can be used to improve various properties of the thermoplastic elastomer composition. Examples of the thermoplastic resin include, for example, an object of improving compression set. A polyphenylene ether resin or a polyolefin-based resin or a polystyrene-based resin is used for the purpose of improving workability and heat resistance.

The polyphenylene ether resin is a homopolymer composed of a repeating unit represented by the following general formula or a copolymer containing the repeating unit.

[0011]

Embedded image

(In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a halogen atom or a hydrocarbon group.) As the polyphenylene ether resin, known ones can be used. Specifically, poly (2,6-dimethyl-
1,4-phenylene ether), poly (2-methyl-6)
-Ethyl-1,4-phenylene ether), poly (2,
6-diphenyl-1,4-phenylene ether), poly (2-methyl-6-phenyl-1,4-phenylene ether), poly (2,6-dichloro-1,4-phenylene ether) and the like. Further, 2,6-dimethylphenol and monovalent phenols (for example, 2,3,6-
Polyphenylene ether copolymers such as copolymers with trimethylphenol and 2-methyl-6-butylphenol) can also be used. Among them, poly (2,6-
Dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable, and poly (2,6-dimethyl-1,4-phenylene ether) is more preferable. Is preferred.

Examples of the polyolefin resin include polyethylene, isotactic polypropylene, and a copolymer of propylene with a small amount of other α-olefin (for example, propylene-ethylene copolymer, propylene / 4-methyl- 1-pentene copolymer), poly (4-
Methyl-1-pentene), polybutene-1 and the like. When using isotactic polypropylene or its copolymer as the polyolefin resin,
Its MFR (JIS K7210) is 0.1 to 50 g / 1
Those having a range of 0 minute, particularly 0.5 to 30 g / 10 minutes can be suitably used.

Further, as the polystyrene-based resin, any one obtained by a radical polymerization method or an ionic polymerization method can be suitably used as long as it is obtained by a known production method. The number average molecular weight of the polystyrene resin is preferably 5,000 to 500,000, more preferably 1,000.
The molecular weight distribution can be selected from the range of 0 to 200,000, and the molecular weight distribution [the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (Mw / Mn)] is preferably 5 or less. Examples of the polystyrene resin include polystyrene, a styrene-butadiene block copolymer having a styrene unit content of 60% by weight or more, rubber-reinforced polystyrene, poly-α-methylstyrene, polypt-butylstyrene, and the like. In the present invention, these thermoplastic resins may be used alone or in combination of two or more, and the blending amount is 99% by weight or less based on the total amount of the thermoplastic polymer compound, It is preferably at most 70% by weight. In the present invention, a polyolefin resin is particularly preferable as the thermoplastic resin.

On the other hand, the oil used in the method of the present invention is used to lower the hardness of the thermoplastic elastomer composition, and may be any of those conventionally used as softeners for plastics and rubber. Can be selected and used. As this oil,
For example, it can be appropriately selected from various softening agents for rubber or resin such as mineral oil, vegetable oil, and synthetic oil. Here, mineral oils include naphthenic and paraffinic process oils, and vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, and the like.
Nakiko oil, peanut oil, wood wax, pine oil, olive oil, and the like. Among them, one or two or more selected from non-aromatic oils, especially mineral oil-based paraffinic oils, naphthenic oils or synthetic polyisobutylene-based oils, having a weight average molecular weight of 300 or more, especially Those which are 450-5000 are preferred. It is preferable that the compounding amount of the oil is appropriately selected according to the molecular weight of the thermoplastic elastomer and the type and amount of the thermoplastic resin added to the elastomer.

In the method of the present invention, the thermoplastic elastomer is blended in a ratio of 0 to 50 parts by weight of the polyolefin resin and 1 to 4000 parts by weight of the oil with respect to 100 parts by weight of the styrene thermoplastic elastomer. It is preferred to produce If the amount of the polyolefin resin exceeds 50 parts by weight, the hardness of the thermoplastic elastomer composition becomes too high, which is not preferable. If the amount of the oil is less than 1 part by weight, a sufficiently low hardness cannot be achieved,
The flexibility of the thermoplastic elastomer composition may be insufficient, and if it exceeds 4000 parts by weight, the oil tends to bleed and the mechanical strength of the thermoplastic elastomer composition is reduced. In consideration of lowering the hardness of the thermoplastic elastomer composition, mechanical strength, prevention of bleeding of the oil, and the like, a more preferable blending amount of the oil is in the range of 1 to 1,000 parts by weight, particularly 1 to 500 parts by weight. In the production method of the present invention, using a twin-screw kneader,
A thermoplastic elastomer composition is produced by kneading a thermoplastic polymer compound containing at least 1% by weight of the thermoplastic elastomer and an oil. At this time, molecules of the thermoplastic elastomer are cut in a kneading zone. In order to prevent this, it is necessary to bring the thermoplastic polymer compound into contact with at least a part of the oil to be blended, and then to knead the mixture in a twin-screw kneader.

That is, it is important that the thermoplastic polymer compound is brought into contact with at least a part of the oil to be blended before reaching the kneading zone of the twin-screw kneader.
Without contacting the oil before reaching the kneading zone, for example, when the oil is side-fed from the middle of the twin-screw kneader and the thermoplastic polymer compound and the oil are contacted and kneaded in the kneading zone, The molecules of the thermoplastic elastomer in the molecular compound are cleaved, the molecular weight is reduced, and one having desired performance cannot be obtained, and the object of the present invention cannot be achieved.

Prior to reaching the kneading zone, the thermoplastic polymer compound and the oil are brought into contact with each other by the following methods: (1) a part of the oil to be previously blended with the thermoplastic elastomer and the optional thermoplastic resin; After mixing the whole with a known mixer, feed this from the polymer inlet of the twin-screw kneader, if there is any remaining oil,
A method in which this oil is fed from a polymer inlet or a side feed port, or (2) a part or all of an oil to be blended with a mixture of a thermoplastic elastomer and a thermoplastic resin used as required, is mixed with a twin-screw kneader. A method in which the oil is fed from the polymer inlet at the same time as the remaining oil, if any, is fed from the side feed port. Known mixers used in the method (1) include, for example, V
Mold blender, ribbon blender, Henschel mixer and the like. The kneading temperature is appropriately selected depending on the type of the thermoplastic elastomer used and the type of the thermoplastic resin used as desired, for example, when using a styrene-based thermoplastic elastomer and a polyolefin-based resin, usually 150 to 150. 250 ° C, preferably 1
It is selected in the range of 80 to 230 ° C.

The twin-screw kneader used in the present invention preferably has a ratio L / D of the total screw length (L) to the cylinder diameter (D) of 30 or more, particularly preferably in the range of 50 to 70. preferable. When L / D is less than 30, dispersion may be poor. Further, the ratio of the length of the kneading zone to the entire length of the screw is preferably 30% or more, particularly preferably in the range of 40 to 70%. If this ratio is less than 30%, kneading becomes insufficient, and a thermoplastic elastomer composition having desired physical properties may not be obtained. Further, in this twin-screw kneader, the two screws may have the same rotation direction (biaxial in the same direction) or may have different rotation directions (biaxial in different directions).
Furthermore, the rotation speed of the screw is not particularly limited, and can be appropriately selected according to various situations.

In the present invention, in addition to the above components, clay, diatomaceous earth, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide,
Flaky inorganic additives such as mica, graphite, aluminum hydroxide, etc., various metal powders, wood chips, glass powders, ceramic powders, granular or powdered solid fillers such as polymer or powder, other various natural or Artificial short fibers and long fibers (for example, straw, wool, glass fiber, metal fiber, various other polymer fibers, and the like) can be blended. The weight can be reduced by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, or an organic hollow filler made of polyvinylidene fluoride, a polyvinylidene fluoride copolymer, or the like. Further, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents, and it is also possible to mechanically mix gas during mixing or the like.

Further, if necessary, a flame retardant, an antibacterial agent,
Hindered amine light stabilizer, ultraviolet absorber, antioxidant, colorant, silicone oil, silicone polymer,
Various tackifiers (tack fire) such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, and rosin derivative; various adhesive elastomers such as Rheostomer B (trade name: manufactured by Riken Vinyl Co., Ltd.); Trade name: Kuraray Co., Ltd., a block copolymer in which polystyrene blocks are linked to both ends of a vinyl-polyisoprene block), Norex (trade name: Nippon Zeon, polynorbornene obtained by ring-opening polymerization of norbornene) Other thermoplastic resins can be used in combination. The silicone polymer preferably has a weight average molecular weight of 10,000 or more, preferably 100,000 or more. The silicone polymer improves the surface tackiness of a molded article using the composition. As the silicone polymer, a general-purpose thermoplastic polymer such as polyethylene, polypropylene, or polystyrene, which is blended at a high concentration, can be used in order to improve handleability. In particular, the blended product with polypropylene has good workability and physical properties. As such a material, for example, a commercially available silicone concentrate BY27 series general-purpose type commercially available from Toray Dow Corning Silicone Co., Ltd. may be used.

The surface condition of the molded article can be improved by blending the silicone polymer. However, the miscibility of the silicone polymer with the copolymer composed of the vinyl aromatic compound block and the conjugated diene compound block can be improved. Is not always good. This can easily be imagined from the fact that the chemical composition of each polymer is significantly different. Therefore, the silicone polymer may be separated depending on the content of the blend and the molding conditions of the molded article. At this time, a graft polymer obtained by chemically bonding a silicone polymer to a polymer having relatively good miscibility with a copolymer composed of a vinyl aromatic compound block and a conjugated diene compound block, for example, a polyolefin resin is used. This can improve the condition. As such a material, for example, a material commercially available as a BY27 series graft type from Toray Dow Corning Silicone Co., Ltd. may be used.

There are no particular restrictions on the timing of blending these additives, and they may be blended at any stage. For example, a part or all of this additive component is added when a thermoplastic polymer compound containing a thermoplastic elastomer and an oil are mixed in advance by a mixer, and if there is any remaining additive component, it is biaxially kneaded. May be introduced from a polymer inlet or a side feed port of the kneader, or a part or all of the added components are fed from a polymer inlet of a twin-screw kneader, and if there are any remaining added components, these are added. You may feed from the side feed opening. Depending on the type of the thermoplastic elastomer used, it is also possible to add a crosslinking agent such as an organic peroxide or a crosslinking assistant to partially crosslink. Here, as a cross-linking agent that can be added for partial cross-linking, an organic peroxide is preferably mentioned, and specifically, for example, 2,5-dimethyl-2,5
-Di (t-butylperoxy) -hexane; 2,5-dimethyl-2,5-di (benzoylperoxy) -hexane; t-butylperoxybenzoate; dicumyl peroxide; t-butylcumyl peroxide; Diisopropylbenzohydroperoxide; 1,3-bis- (t-butylperoxyisopropyl) -benzene;
Benzoyl peroxide; 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane and the like, and useful crosslinking aids include, for example, divinylbenzene, trimethylolpropane triacrylate , Ethylene dimethacrylate, diallyl phthalate, quinone dioxime, phenylene bismaleimide, polyethylene glycol dimethacrylate, and unsaturated silane compounds. These organic peroxides and crosslinking aids can be used arbitrarily to adjust the degree of crosslinking in the range of 0.1 to 5 parts by weight, when the whole composition is 100 parts by weight. These organic peroxides and crosslinking assistants may be used in combination of two or more, if necessary. When an unsaturated silane compound is used as a crosslinking aid, crosslinking can be further advanced by contact with moisture in the presence of a silanol condensation catalyst. In this manner, the thermoplastic elastomer composition having desired performances, such as the molecules of the thermoplastic elastomer being not cut, having excellent rubber elasticity, having good oil retaining properties, and having a small compression set, are obtained. It can be obtained with good productivity and stability.

The present invention also provides a thermoplastic elastomer composition produced by the above-mentioned method. Since this composition has the above-mentioned excellent performance, it can be used in various applications, especially footwear and shoes. It is suitably used as a bottom, a vibration insulator, and the like. Examples of the use of the vibration damping material include, for example, audio equipment, information-related equipment, information transmission equipment, game-related equipment, and the like. Specific examples of the audio equipment include portable CD players and car insulators for car CDs; microphone holders for vibration isolation of home video, boombox, karaoke, various handy microphones, etc .; cone edges of speakers; boombox tape holders; Holders for mini disks for digital cameras; optical disk holders for digital video disks, etc .; information-related devices include insulators for hard disk drives; insulators for various motors such as HDD spindle motors and stepping motors; insulators for floppy disk drives; CD-ROM insulators; optical disk holders such as MOs, etc .;
S and other small high-performance microphone holders and speaker holders; microphones for wireless devices; disk holders for portable electronic notebooks and the like; game-related devices include CD-ROM insulators for home-use game devices; Microphone holder; speaker cone, etc. Other application fields include various word processors, personal computer printers, small and medium-sized handy type printing devices, various name print devices, etc. CD-RO used for measuring instruments
M insulator; various packings, gaskets, seals (especially gaskets for information equipment and gaskets for storage devices), shock absorbers, cushioning materials, and the like.

[0025]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The physical properties of the obtained thermoplastic elastomer composition were measured in the following manner. (1) Hardness The hardness of rubber measured by a JIS A type hardness meter specified in JIS K6301. (2) Tb (rupture strength) The tensile strength at break of rubber measured by a JIS A type hardness meter specified in JIS K6301. (3) Eb (elongation at break) Tensile elongation at break of rubber measured by a JIS A type hardness meter specified in JIS K6301. (4) C.I. S. (Compression permanent set) The compression set of rubber at 70 ° C. for 22 hours measured by a JIS A-type hardness tester specified in JIS K6301.

Examples 1 to 4 and Comparative Examples 1 and 2 Twin-screw kneader [Toshiba Machine Co., Ltd., TEM58BS type, ratio L / D of screw length (L) to cylinder diameter (D) = 62.
5. Ratio of length of kneading zone to total screw length = 6
2%] and a styrene-based elastomer A [SEP having a number average molecular weight of 100,000 and a styrene unit content of 30% by weight]
S], a styrene-based elastomer B [number-average molecular weight of 50,000,
SEBS having a styrene unit content of 30% by weight], polypropylene [Melt flow rate (MFR) measured by JIS K6758: 50 g / 10 min], and weight average molecular weight of 75
By kneading the paraffinic oil of No. 0 at the mixing ratio, oil supply method and kneading temperature shown in Table 1,
A thermoplastic elastomer composition was produced. Table 1 shows the state and physical properties of this composition.

[0027]

[Table 1]

[Note] 1) Styrene-based elastomer A: number average molecular weight 100,000
SEPS having a styrene unit content of 30% by weight 2) Styrene-based elastomer B: SEBS having a number average molecular weight of 50,000 and a styrene unit content of 30% by weight 3) Polypropylene: Melt flow rate (MFR) 5
0 g / 10 min 4) Oil: paraffinic oil having a weight average molecular weight of 750 5) Supply method of oil Premix: A method in which a polymer and an oil are brought into contact in advance and the oil is contained in polymer pellets or polymer powder. Simultaneous supply from the polymer supply port: A method in which oil is supplied directly to the supply port that supplies the polymer to the twin-screw kneader. Side feed: A method in which a polymer is first supplied to a twin-screw kneader, and after melt-kneading is started, oil is supplied from the middle of the twin-screw kneader.

[0029]

According to the present invention, a thermoplastic elastomer, in particular, a styrene-based thermoplastic elastomer and an oil, or a mixture of the elastomer, a thermoplastic resin and an oil using a twin-screw kneader, is used to obtain the elastomer. Molecule is not cut, excellent rubber elasticity,
A thermoplastic elastomer composition having desired properties, such as good oil retention and small compression set, can be stably manufactured with good productivity. Since the thermoplastic elastomer composition obtained by the method of the present invention has the above-mentioned excellent performance, it can be used in various applications, especially footwear and shoe soles, or audio equipment, information-related equipment, information transmission equipment, and game-related equipment. , And is suitably used as an anti-vibration material for other devices.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 21:00) (C08L 101/00 53:00 23:02) B29K 101: 12 F term (Reference) 4F070 AA12 AA17 AA18 AA40 AC94 AE02 FA06 FA09 FB06 FC05 4F201 AA03 AA13A AA45 AA49 BC01 BC02 BC12 BC37 BK13 BK26 BK40 4J002 AE053 BB032 BB122 BB142 BB172 BC031 BN141 BP011 BP031 FD010

Claims (9)

[Claims] 1. A method for producing a thermoplastic elastomer composition by kneading a thermoplastic polymer compound containing at least 1% by weight of a thermoplastic elastomer and oil with a biaxial kneader, wherein the thermoplastic polymer compound and the oil are mixed. A method for producing a thermoplastic elastomer composition, comprising bringing at least a part of oil to be blended into contact, and thereafter kneading in a twin-screw kneader. 2. Before reaching the kneading zone of the twin-screw kneader,
The method for producing a thermoplastic elastomer composition according to claim 1, wherein the thermoplastic polymer compound is brought into contact with at least a part of oil to be blended. 3. The method for producing a thermoplastic elastomer composition according to claim 1, wherein the twin screw kneader has a ratio L / D of the total screw length (L) to the cylinder diameter (D) of 30 or more. . 4. The method for producing a thermoplastic elastomer composition according to claim 1, wherein the ratio of the length of the kneading zone to the total length of the screw is 30% or more in the twin-screw kneader. 5. The method for producing a thermoplastic elastomer composition according to claim 1, wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer. 6. The method for producing a thermoplastic elastomer composition according to claim 5, wherein the styrene-based thermoplastic elastomer has a number average molecular weight of 30,000 or more. 7. The method for producing a thermoplastic elastomer composition according to claim 1, wherein the oil is a non-aromatic oil having a weight average molecular weight of 300 or more. 8. A thermoplastic elastomer composition comprising 0 to 50 parts by weight of a polyolefin resin and 1 to 4000 parts by weight of oil per 100 parts by weight of a styrene thermoplastic elastomer.
The method for producing a thermoplastic elastomer composition according to claim 5, 6 or 7, which comprises parts by weight. 9. A thermoplastic elastomer composition obtained by the production method according to claim 1.