JP2000169640A - Thermoplastic elastomer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermoplastic elastomer composition having excellent mechanical properties and having excellent abrasion resistance and dry touch feeling as well. SOLUTION: This thermoplastic elastomer composition which is partially or wholly crosslinked comprises a total of 100 pts.wt. of (A) 1-99 pts.wt. of a crosslinkable elastomer and (B) 1-99 pts.wt. of a thermoplastic resin and (C) 0.01-20 pts.wt. of a high-molecular weight polyorganosiloxane >=5,000 cSt in the dynamic viscosity at 25 deg.C specified in the JIS K-2410.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermoplastic elastomer composition comprising a crosslinkable elastomer containing a high molecular weight polyorganosiloxane having a specific viscosity and a thermoplastic resin. Further, the present invention relates to a thermoplastic elastomer composition having significantly improved abrasion resistance and excellent touch feeling without stickiness.

[0002]

2. Description of the Related Art Conventionally, automobile interior / exterior parts, home appliance parts, OA equipment supplies, sports goods, daily miscellaneous goods, etc.
For the purpose of improving the appearance and feel, imparting good design properties, good feel to directly touching parts, and functions such as anti-slip, a technique of using a soft elastomer molded article as an appearance part is frequently used.

[0003] Vulcanized rubber using ethylene-propylene-diene rubber (hereinafter referred to as EPDM) or styrene-butadiene rubber or the like, or soft vinyl chloride has been frequently used for the soft elastomer molded product. From the viewpoint of economic reasons and environmental problems caused by the production cost, studies on substitution of thermoplastic elastomers represented by styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, and the like have been actively conducted.

[0004] These thermoplastic elastomers are used in a wide variety of fields because they are excellent in moldability such as injection molding, extrusion molding, blow molding and the like, and are also excellent in flexibility and feel. Particularly, in the case of an olefin-based thermoplastic elastomer, a crosslinking reaction is performed while melt-kneading a crosslinkable olefin-based elastomer and a non-crosslinkable polyolefin-based resin such as polypropylene (hereinafter referred to as PP) in an extruder in the presence of a crosslinking agent. In recent years, olefin-based thermoplastic elastomers produced by so-called dynamic crosslinking have been actively studied for alternatives to conventional materials for automotive interior parts and the like, and have actually been adopted for many parts.

On the other hand, on the other hand, parts that directly touch the hand, such as grips, or external parts that always contact other parts, such as a bed, have a feeling of stickiness or damage when touched, or a large amount of wear. At present, there is a delay in substituting the above-mentioned soft vinyl chloride, which is relatively superior in characteristics such as feel, scratch resistance, and abrasion resistance.

[0006] In recent years, in order to solve the above-mentioned problems, a general-purpose low-viscosity silicone oil-added material has been developed as an olefin-based thermoplastic elastomer molding material particularly for an automobile interior material. By adding the low-viscosity silicone oil, the coefficient of friction on the surface of the molded article was reduced, and the scratch resistance seemed to be improved at first glance, but the improvement was insufficient, especially with respect to the wear resistance against repeated friction. . In addition, low viscosity silicone oil is not sufficiently effective to give a soft touch.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a significantly improved touch compared to the prior art, which is preferably used for interior and exterior parts of automobiles, home electric parts, OA equipment, sports goods, daily necessities and the like. Another object of the present invention is to provide a thermoplastic elastomer composition having improved scratch resistance and abrasion resistance.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above points, and as a result, have found that the following thermoplastic elastomer compositions can solve all of the above-mentioned problems, and have reached the present invention. Was. That is, the present invention provides (A) 1 to 99 parts by weight of a crosslinkable elastomer, and (B) thermoplastic resin 1 to 9
9 parts by weight [the total amount of (A) and (B) is 100 parts by weight],
And (C) a high molecular weight polyorganosiloxane 0.01 to
It is intended to provide a partially or completely crosslinked thermoplastic resin composition comprising 20 parts by weight.

Hereinafter, the present invention will be described in detail. The composition of the present invention is a partially or completely crosslinked thermoplastic resin composition comprising (A) a crosslinkable elastomer, (B) a thermoplastic resin, and (C) a high molecular weight polyorganosiloxane. Here, it is preferable that the rubber component (A) partially or completely crosslinked exists as an "island" in the "sea" of (B).

Hereinafter, each component of the present invention will be described in detail. [(A) Crosslinkable Elastomer] The (A) crosslinkable elastomer in the present invention includes, for example, polystyrene-based, polyolefin-based, polyester-based, polyurethane-based, 1,2-
It is a polybutadiene type or the like, and among them, a polyolefin type elastomer is particularly preferably used. Among them, particularly preferred are ethylene / α-olefin copolymers or ethylene / α-olefin / diene copolymers, for example, ethylene / α-olefin copolymers comprising ethylene and α-olefins having 3 to 20 carbon atoms, Alternatively, an ethylene / α-olefin / diene copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms and a diene component represented by dicyclopentadiene may be used. Among them, an ethylene / α-olefin copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms is more preferable.

The α-olefin having 3 to 20 carbon atoms includes, for example, propylene, butene-1, pentene-
1, hexene-1, 4-methylpentene-1, heptene-1, octene-1, nonene-1, decene-1, undecene-1, dodecene-1, and the like. Of these, hexene-1, 4-methylpentene-1 and octene-1 are preferred, and octene-1 is most preferred. Octene-1 has a small but excellent effect of imparting flexibility of the polymer itself, and the obtained copolymer has particularly excellent balance between mechanical strength and flexibility.

The polyolefin elastomer suitably used as the crosslinkable elastomer (A) of the present invention is preferably produced using a known metallocene catalyst.
In general, a metallocene-based catalyst is composed of a cyclopentadienyl derivative of a group IV metal such as titanium or zirconium and a co-catalyst, and is not only highly active as a polymerization catalyst but also obtains a heavy weight in comparison with a Ziegler-based catalyst. The molecular weight distribution of the union is narrow, and the comonomer in the copolymer has 3 to 2 carbon atoms.
It is characterized in that the distribution of α-olefins of 0 is uniform.

The polyolefin elastomer preferably used as the crosslinkable elastomer (A) of the present invention is αα
-The copolymerization ratio of the olefin is preferably 1 to 50% by weight, more preferably 10 to 40% by weight, and most preferably 20 to 40% by weight. When the copolymerization ratio of the α-olefin exceeds 50% by weight, the mechanical strength and heat resistance of the composition are greatly reduced. On the other hand, when it is less than 1% by weight, the hardness of the composition is high and flexibility as an elastomer material is reduced. It is not preferable because it lacks.

The density (d) of the crosslinkable elastomer (A) of the present invention is preferably in the range of 0.8 to 0.9 g / cm ³ . By using a crosslinkable elastomer having a density in this range, a thermoplastic elastomer composition having an excellent balance between mechanical strength and flexibility can be obtained.
It is desirable that the crosslinkable elastomer (A) of the present invention has a long-chain branch. The presence of the long-chain branch enables the density to be lower than the ratio (% by weight) of the copolymerized α-olefin without lowering the mechanical strength. Hardness and high strength elastomer can be obtained. As an olefin-based crosslinkable elastomer having a long-chain branch, US Pat.
And so on.

The above-mentioned polyolefin crosslinkable elastomer preferably has a DSC melting point peak at room temperature or higher. When it has a melting point peak, the form is stable in the temperature range below the melting point, the handleability is excellent, and there is no sticky feeling. Further, the melt flow rate of the crosslinkable elastomer (A) of the present invention is 0.01 to 100 g / 10
Min (190 ° C., 2.16 kg load) is preferably used, and more preferably 0.1 to 10 g / 10 min.

When the amount exceeds 100 g / 10 minutes, the crosslinking property of the thermoplastic elastomer composition is insufficient, and
If it is less than 1 g / 10 minutes, the fluidity deteriorates and the processability is adversely affected, which is not desirable. The component (A) used in the present invention may be a mixture of a plurality of types. In such a case, it is possible to further improve the workability. [(B) Thermoplastic resin] The thermoplastic resin (B) in the present invention is not particularly limited as long as it is compatible with or homogeneously dispersed with (A). For example, polystyrene (atactic and syndiotactic), polyphenylene ether, polyolefin, polyamide,
Polyester, polyphenylene sulfide, polycarbonate, polymethacrylate and the like can be used alone or in combination of two or more.
Among them, polyolefin resins are particularly preferable, and among them, polypropylene resins are most preferable.

Specific examples of the polypropylene resin most preferably used in the present invention include homo isotactic polypropylene, propylene and ethylene, butene-1,
And isotactic copolymer resins (including block and random) with other α-olefins such as pentene-1 and hexene-1. At least one or more thermoplastic resins (B) selected from these resins are used in a composition ratio of 1 to 99 parts by weight based on a total of 100 parts by weight of (A) and (B). Preferably it is 5 to 90 parts by weight, more preferably 15 to 80 parts by weight, most preferably 15 to 70 parts by weight. If the amount is less than 1 part by weight, the fluidity and processability of the composition are deteriorated. If the amount is more than 99 parts by weight, the flexibility of the composition is insufficient, and both are undesirable.

The melt flow rate of the thermoplastic resin (B) used in the present invention is 0.1 to 100 g / 1.
Those in the range of 0 minutes (230 ° C., 2.16 kg load) are preferably used. If it exceeds 100 g / 10 minutes, the heat resistance and mechanical strength of the thermoplastic elastomer composition will be insufficient, and if it is less than 0.1 g / 10 minutes, the fluidity will be poor and the moldability will be reduced, which is not desirable. . [(C) High-molecular-weight polyorganosiloxane] The (C) high-molecular-weight polyorganosiloxane in the present invention has a viscous syrupy to gum-like form, and has a kinematic viscosity (25 ° C.) specified in JIS-K2410 of 5,000 cm. It is an essential condition that it is equal to or more than Stokes (hereinafter, referred to as CS). When the kinematic viscosity of the component (C) exceeds 5000 CS, an excellent effect of improving abrasion resistance and touch feeling is exhibited.

Regarding the upper limit of the kinematic viscosity of (C), the range in which the viscosity can be actually measured is up to about several million CS.
Even if the (C) high molecular weight polyorganosiloxane in the region is used, it is possible to obtain a good composition according to the gist of the present invention. In addition, even if a gum-like (C) high molecular weight polyorganosiloxane in a region where viscosity cannot be measured is used, a favorable composition can be obtained, and therefore the upper limit is infinite.

The kinematic viscosity (25 ° C.) of the high molecular weight polyorganosiloxane (C) used in the present invention is 5000 CS
It is more preferably 10,000 CS or more, and most preferably 50,000 CS or more. The high molecular weight polyorganosiloxanes useful in the present invention are generally random polymers containing alkyl, vinyl and / or aryl substituted siloxane units, the structure of which is shown in Chemical Formula 1. Among them, polydimethylsiloxane in which R1 to R4 are all methyl groups is most preferable.

[0021]

Embedded image

(R1 to R4 are hydrocarbons having 1 to 10 carbon atoms and may be the same or different. N is an integer of 1 or more, and the kinematic viscosity at 25 ° C. varies within a range of 5000 CS or more. The amount of the high molecular weight polyorganosiloxane (C) used in the present invention is 100 parts by weight based on the total of (A) the crosslinkable elastomer and (B) the thermoplastic resin, which are the components of the thermoplastic elastomer composition of the present invention. And 0.01
-20 parts by weight. If the addition amount of (C) is less than 0.01 part by weight, the effect of addition is not sufficiently exhibited, and if it exceeds 20 parts by weight, the effect of abrasion resistance reaches a peak and the sticking by (C) itself is caused. Is not preferred. Above all, the preferable range of the addition amount is (A) + (B) 1
The amount is 0.1 to 20 parts by weight, more preferably 0.2 to 10 parts by weight, based on 00 parts by weight.

For the purpose of imparting other functions such as releasability, a polyorganosiloxane having a molecular weight of less than 5000 CS may be used in combination with the above-mentioned (C) high molecular weight polyorganosiloxane. It is preferable to add a softener to the thermoplastic elastomer composition of the present invention, if necessary, in order to impart flexibility and improve processability.

The softening agent is preferably a paraffinic or naphthenic process oil. The blending amount of the above-mentioned softener is not specified at all, but if a preferred blending amount is exemplified, 5-300 parts by weight, preferably 10-150 parts by weight, is added to 100 parts by weight of the thermoplastic elastomer composition of the present invention. It is common to use them. If the amount is less than 5 parts by weight, the effect of adding the process oil is not sufficiently exhibited, and if the amount exceeds 300 parts by weight, the composition cannot retain the oil sufficiently and oil bleeding to the surface of the molded article becomes remarkable. Is not desirable from the viewpoint of deterioration of

The thermoplastic elastomer composition provided by the present invention comprises (A) the crosslinkable elastomer described above,
By combining (B) a thermoplastic resin represented by a polypropylene-based polymer, (C) a high-molecular-weight polyorganosiloxane having a specific viscosity, and a process oil as the above-mentioned softener in a specific composition ratio, scratch resistance is obtained. The balance between appearance properties such as wearability, abrasion resistance, and feel, and all of mechanical strength, flexibility, and moldability is improved, and the composition can be preferably used as a molding material.

The thermoplastic elastomer composition of the present invention needs to partially or completely crosslink the composition. This makes it possible to further improve wear resistance, mechanical strength, heat resistance, and the like. In the present invention, means for partially or completely cross-linking the composition is not specified, but a method of cross-linking using a radical initiator such as an organic peroxide or a radical initiator and a cross-linking auxiliary is most recommended. You.

Here, specific examples of the radical initiator preferably used include 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane,
1,1-bis (t-hexylperoxy) -3,3,5
-Trimethylcyclohexane, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis (t-
Butylperoxy) cyclododecane, 1,1-bis (t
-Butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) octane, n-butyl-4,
Peroxy ketals such as 4-bis (t-butylperoxy) butane and n-butyl-4,4-bis (t-butylperoxy) valerate; di-t-butyl peroxide, dicumyl peroxide, t -Butylcumyl peroxide, α, α′-bis (t-butylperoxy-m
-Isopropyl) benzene, α, α'-bis (t-butylperoxy) diisopropylbenzene, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5 Dialkyl peroxides such as -bis (t-butylperoxy) hexine-3; acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexa Diacyl peroxides such as noyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and m-trioyl peroxide; t-butylperoxyacetate, t
-Butylperoxyisobutyrate, t-butylperoxy-2-ethylhexanoate, t-butylperoxylaurate, t-butylperoxybenzoate,
Di-t-butylperoxyisophthalate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, and cumylperoxyoctate Peroxyesters; and
Hydrogens such as t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 1,1,3,3-tetramethylbutyl peroxide Peroxides can be mentioned.

Among these compounds, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl- 2,5-Bis (t-butylperoxy) hexane and 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 are particularly preferably used.

These radical initiators are (A) 100
0.02 to 3 parts by weight, preferably 0.05 to 3 parts by weight
Used in an amount of １1 part by weight. If the amount is less than 0.02 parts by weight, the crosslinking reaction is insufficient. On the other hand, if the amount exceeds 3 parts by weight, the physical properties such as the mechanical strength of the elastomer composition level off and become meaningless. Further, as a crosslinking aid, divinylbenzene, triallyl isocyanurate,
Triallyl cyanurate, diacetone diacrylamide, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, ethylene glycol dimethacrylate,
Triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, diisopropenylbenzene, P- quinone dioxime, P, P ^'- dibenzoyl quinone dioxime, phenylmaleimide, allyl methacrylate, N, ^{N'-m-phenylene} bismaleimide, diallyl Phthalate, tetraallyloxyethane, 1,2
-Polybutadiene and the like are preferably used. These crosslinking aids may be used alone or in combination of two or more.

These crosslinking assistants are used in an amount of 0.1 to 5 parts by weight, preferably 0.5 to 2 parts by weight, per 100 parts by weight of the crosslinkable elastomer (A). If the amount is less than 0.1 part by weight, the crosslinking reaction is insufficient. If the amount exceeds 5 parts by weight, the physical properties such as the mechanical strength of the composition are not improved. The result remains and is not preferable in quality.

The thermoplastic resin (B), which is a component of the thermoplastic elastomer composition of the present invention, may be used in combination with another thermoplastic resin or a thermoplastic elastomer to such an extent that its characteristics are not impaired. Specifically, ethylene-vinyl ester copolymers such as high-density polyethylene, constant-density polyethylene, polybutene, polyisobutene, ethylene-vinyl acetate copolymer, and ethylene-unsaturated carboxylic acid esters such as ethylene-ethyl acrylate copolymer Copolymer, ethylene-vinyl alcohol copolymer, styrene-butadiene block copolymer and hydrogenated product thereof,
Block copolymers such as styrene-isoprene block copolymers and hydrogenated products thereof are preferably used.

In particular, the above-mentioned block copolymer has been commercialized. For example, as an example, it is marketed by Tuftec, Tufprene, which is marketed by Asahi Kasei Kogyo, Septon, Hibler, and shell chemicals which are marketed by Kuraray. Clayton G, Clayton D and the like. In the thermoplastic elastomer composition of the present invention, if further excellent stability is required, if necessary,
One or more stability improvers selected from ultraviolet absorbers, hindered amine light stabilizers, antioxidants, and light-shielding agents such as titanium oxide can be blended.

The addition amount of the above-mentioned stability improver is not limited at all in the present invention, but the recommended addition amount is 0.05 to 20 parts by weight based on 100 parts by weight of the total amount of (A) and (B).
Parts by weight, preferably 0.1 to 10 parts by weight, most preferably 0.5 to 5 parts by weight. Further, the thermoplastic elastomer composition of the present invention can contain an inorganic filler to such an extent that its characteristics are not impaired. Examples of the inorganic filler used here include calcium carbonate, magnesium carbonate, silica, carbon black, glass fiber, titanium oxide, clay, mica, talc, magnesium hydroxide, and aluminum hydroxide.

Other additives such as organic / inorganic pigments, flame retardants, metal fibers, organic fibers, anti-blocking agents represented by ethylene bisstearate, foaming agents, foam nucleating agents, antistatic agents, antibacterial agents Agents and the like are also preferably used. For the production of the thermoplastic elastomer composition of the present invention,
Ordinary thermoplastic resin composition, Banbury mixer used in the production of thermoplastic elastomer composition, kneader,
General methods such as a single screw extruder and a twin screw extruder can be employed. In particular, a twin-screw extruder is preferably used to achieve dynamic crosslinking efficiently. The twin-screw extruder uniformly and finely disperses the crosslinkable elastomer and the thermoplastic resin, and further adds another component to cause a crosslink reaction. Thus, the suitable thermoplastic elastomer composition of the present invention is continuously produced. More suitable for manufacturing.

The thermoplastic elastomer composition of the present invention comprises:
It can be manufactured through a processing step as described below. That is, the crosslinkable elastomer and the polypropylene-based resin are well mixed, and are charged into a hopper of an extruder. The radical initiator, the crosslinking aid and / or the high molecular weight polyorganosiloxane may be added together with the crosslinkable elastomer and the polypropylene resin from the beginning, or may be added in the middle of the extruder. The high molecular weight polyorganosiloxane and / or the process oil used as the softening agent may be added from the middle of the extruder, or may be added separately at the beginning and the middle. Further, a part of the crosslinkable elastomer and the polypropylene resin may be added in the middle of the extruder. When heated and melted and kneaded in an extruder, the crosslinkable elastomer and a radical initiator and a crosslinking aid cause a crosslinking reaction, and furthermore, a process oil and the like are added and melt-kneaded to form a crosslinking reaction and kneading dispersion. And let it go out of the extruder. Finally, pelletization is performed to obtain pellets of the preferred thermoplastic elastomer composition of the present invention.

As for the method of adding (C) the high molecular weight polyorganosiloxane, a method using a masterbatch which has been previously made highly concentrated using an arbitrary thermoplastic resin may be used in addition to the above specific examples. In this case, the thermoplastic resin used is preferably a resin of the same system as the component (B) of the present invention. The degree of crosslinking is defined as a measure of the crosslinkability of the composition. 0.5 g of the thermoplastic polymer composition of the present invention was added to xylene 20
Reflux in 0 ml for 4 hours. The solution is filtered through a filter paper for quantification, the residue on the filter paper is vacuum-dried, quantified, and calculated as a ratio (%) of the weight of the residue to the weight of the olefin-based elastomer in the composition.

The degree of crosslinking of the thermoplastic elastomer composition as a preferred composition of the present invention is desirably 30% or more.
If it is less than 30%, the crosslinking is insufficient, and the heat resistance such as compression set and the physical properties such as rebound resilience decrease, which is not preferable. With the thermoplastic elastomer composition of the present invention thus obtained, various molded articles can be suitably produced by an arbitrary molding method. Specifically, injection molding, extrusion molding, compression molding, hollow molding, two-color molding, insert molding,
It is suitably used in any molding method such as injection hollow molding, calendar molding, and foam molding.

[0038]

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In these examples and comparative examples, the test methods used for evaluating various physical properties are as follows. (1) Surface Hardness Four sheets having a thickness of 2 mm were piled up and evaluated according to ASTM D2240 using an A type in a 23 ° C. atmosphere. (2) Tensile breaking strength [MPa] Evaluated in a 23 ° C. atmosphere according to JIS K6251. (3) Tensile elongation at break [%] Evaluated in a 23 ° C. atmosphere according to JIS K6251. (4) Wear resistance Evaluation was performed using a Gakushin type wear tester. The evaluation conditions are as follows.

Temperature condition: 23 ° C. atmosphere Stroke: 120 mm Frequency: 1 reciprocation / 2 seconds Load: 1 kg Friction material: 100% cotton cloth Kanakin No. 3 (JIS L
0803)) Fold in three and attach. Contact area: 1 square cm. Evaluation is the number of times of friction reciprocation until disappearance of grain on the surface of molded article. (5) Feeling of touch (sensory test). The touch was evaluated for its dry feel (no stickiness) and whether or not a fingerprint mark was left on the surface of the molded article.

A: The feel is extremely good and smooth, and no fingerprint is left. ：: Fingerprint marks remain on the surface of the molded product, but no stickiness is felt. ×: Fingerprint marks remain, and there is a sticky feeling and a slimy feeling. The following components were used for each component used in Examples and Comparative Examples. (A) Crosslinkable Elastomer Ethylene / octene-1 copolymer-produced by a method using a metallocene catalyst. The ethylene / octene-1 composition ratio of the copolymer was 72 / weight ratio.
28.

Ethylene / octene-1 copolymer-Produced by a method using a usual Ziegler catalyst. The ethylene / octene-1 composition ratio of the copolymer was 72/28 by weight. It was produced by a method using an EPDM-metallocene catalyst. The composition ratio of ethylene / propylene / dicyclopentadiene in the copolymer is 72/24/4 by weight.

EPDM-produced by a method using a usual Ziegler catalyst. The composition ratio of ethylene / propylene / dicyclopentadiene in the copolymer is 72/24/4 by weight. (B) Thermoplastic resin Polypropylene-Nippon Polychem Co., Ltd., isotactic polypropylene homopolymer type Melt flow rate at 230 ° C., 2.16 kg load condition: 30 polypropylene-Nippon Polychem Co., Ltd., isotactic polypropylene ethylene (C) high molecular weight polyorganosiloxane silicone oil-manufactured by Shin-Etsu Chemical Co., Ltd., polydimethylsiloxane at 25 ° C specified by JIS-K2410. Kinematic viscosity: 10,000 CS Trade name: KF96H-10000CS Silicon oil-polydimethylsiloxane manufactured by Shin-Etsu Chemical Co., Ltd. Kinematic viscosity at 25 ° C specified by JIS-K2410: 60,000 CS Trade name: KF96H-60000C Silicon oil-Polydimethylsiloxane manufactured by Shin-Etsu Chemical Co., Ltd. Kinematic viscosity at 25 ° C specified by JIS-K2410: too large to be measured. Trade name: X-22-2101 (master batch with PP; 50%) (C ' ) Low molecular weight polyorganosiloxane silicone oil used in Comparative Example-Polydimethylsiloxane manufactured by Shin-Etsu Chemical Co., Ltd. Kinematic viscosity at 25 ° C specified by JIS-K2410: 10
0CS Trade name: KF96-100CS (D) Softener Paraffin oil Idemitsu Kosan Co., Ltd., Diana Process Oil PW-9
0 (E) Radical initiator 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane manufactured by NOF Corporation Perhexa 25B (F) Crosslinking assistant manufactured by Wako Pure Chemical Industries, Ltd. , Divinylbenzene (G) stabilizer A mixture of lactone-based, hindered-phenol-based, and phosphorus-based antioxidants manufactured by Ciba Specialty Chemicals Co., Ltd. Trade name: IRGANOX HP2411, FF

[0043]

Examples 1 to 13 and Comparative Examples 1 to 3 As an extruder, a twin screw extruder (40 mm) having an oil injection port at the center of the barrel was used.
φ, L / D = 47). As the screw, a double screw having a kneading portion before and after the injection port was used. After mixing at the composition ratios shown in Table 1, the mixture was introduced into a twin-screw extruder (cylinder temperature: 220 ° C.) to perform melt extrusion. However, for the composition using (D) paraffin oil, after mixing other than (D), the mixture is introduced into a twin-screw extruder (cylinder temperature 220 ° C.), and then a predetermined amount is injected from an injection port at the center of the extruder. (D) is injected by a pump,
Melt extrusion was performed.

From the elastomer composition thus obtained, a sheet having a thickness of 2 mm was prepared by compression molding at 200 ° C., and its mechanical properties were evaluated. A flat plate whose back is a mirror surface (MD:
15 cm, TD: 9 cm) was injection-molded at a cylinder temperature of 200 ° C., then cut out to a width of 2.5 cm, and n number 2
The abrasion resistance of the grained surface was evaluated by a gakushin abrasion tester. Further, a sensory test based on a feeling of touch was performed using the mirror surface on the back surface. The results are shown in Table 1.

[0045]

[Table 1]

As is clear from the results, it is understood that the thermoplastic elastomer composition of the present invention has excellent abrasion resistance and smooth feel while maintaining mechanical properties.

[0047]

Industrial Applicability The thermoplastic elastomer composition of the present invention has excellent mechanical strength, excellent abrasion resistance and a crisp feel, and has an instrument panel skin, an airbag cover, a handle, and a shift knob. Interior materials for automobiles represented by levers, window moldings, pedal pads, etc., as well as home appliances, sundries, daily necessities, sporting goods, building materials,
It can be widely used for applications such as sheets and films, and its industrial value is extremely high.

Continued on the front page F term (reference) 4J002 AC04W BB00W BB00X BB05W BB12X BB14X BB15W BB15X BC03X BC04W BG05X CF00W CF00X CG00X CH07X CK02W CL00X CN01X CP033 CP143 FD025

Claims (3)

[Claims] (A) 1 to 99 parts by weight of a crosslinkable elastomer, (B) 1 to 99 parts by weight of a thermoplastic resin [however, the total amount of (A) and (B) is 100 parts by weight], and (C)
The kinematic viscosity at 25 ° C. specified in JIS-K2410 is 50.
A partially or completely crosslinked thermoplastic elastomer composition comprising 0.01 to 20 parts by weight of a high molecular weight polyorganosiloxane having a molecular weight of not less than 00 centistokes. 2. A method according to claim 1, wherein the crosslinkable elastomer comprises ethylene and α-olefin having 3 to 20 carbon atoms.
The thermoplastic elastomer composition according to claim 1, wherein the thermoplastic elastomer composition is a polyolefin resin, and the thermoplastic resin (B) is a polyolefin resin. 3. The thermoplastic elastomer composition according to claim 1, wherein (A) the crosslinkable elastomer is produced using a metallocene catalyst.