JP2019178282A - Thermoplastic elastomer composition - Google Patents

Abstract

To provide a thermoplastic elastomer excellent in deformation recoverability, flexibility, and heat resistance and suitable for a sofa, a seat, a cushion material, a mat material, and the like.SOLUTION: A thermoplastic elastomer resin composition contains 30-95 pts.wt. of an ethylene/α-olefin copolymer (A) having a density of 890-920 kg/mand a weight average molecular weight measured by GPC of 40,000-100,000, 4.99-69.99 pts.wt. of a thermoplastic polyurethane (B) having a JIS A hardness of 60-95 and a 100% modulus of 2-12 MPa, and 0.01-5 pts.wt. of a reactive compatibilizer (C) having an acid anhydride group (the total of (A), (B) and (C) is 100 pts.wt.).SELECTED DRAWING: None

Description

  The present invention relates to a thermoplastic elastomer excellent in heat resistance and deformation recovery, and in particular, has a heat resistance capable of maintaining a shape even under a temperature condition of 45 ° C. or more, and is continuously deformed by a continuous load. Then, it is related with the thermoplastic elastomer resin composition which has a deformation | transformation recovery property when a load is removed.

  In recent years, a thermoplastic elastomer material that is a soft material having rubber elasticity, which does not require a vulcanization process and can be processed and recycled in the same manner as a thermoplastic resin, has become pillows, mattresses and other bedding, automobile parts, and home appliances. Widely used in fields such as parts, wire coating, medical parts, miscellaneous goods, and footwear. Among such thermoplastic elastomer materials, olefinic thermoplastic elastomers composed of polyolefin resins are widely used because of their excellent deformation recovery properties.

  The ethylene / α-olefin copolymer is extrudable and has excellent rubber elasticity and deformation recovery. Therefore, the ethylene / α-olefin copolymer has excellent durability in applications that are relatively repeatedly compressed, such as cushion materials, cushions, and mats. Useful for improving. In general, an ethylene / α-olefin copolymer is a useful elastomer having better deformation recovery and flexibility as the density is lower, but it is difficult to achieve both heat resistance and deformation recovery.

  In order to solve this problem, for example, in Patent Document 1, a specific ethylenically unsaturated silane compound is grafted to a specific ethylene copolymer. It takes a long time of one week in a room where water is sprayed in the form of mist, which is inferior in productivity, and is excellent in deformation recovery and heat resistance due to cross-linking treatment, but inferior in recyclability Met.

JP 2013-181117 A

  The present invention relates to a thermoplastic elastomer resin composition excellent in heat resistance and deformation recovery, and in particular, has heat resistance capable of maintaining a shape even under a temperature condition of 45 ° C. or more, and continuously with a continuous load. It is intended to provide a thermoplastic elastomer resin composition having a deformation recovery property when the load is removed after being deformed.

As a result of intensive studies to solve the above problems, the present invention has been completed. That is, according to the present invention, 30 to 95 parts by weight of an ethylene / α-olefin copolymer (A) having a density of 890 to 920 kg / m ³ and a weight average molecular weight measured by GPC of 40,000 to 100,000, and JIS A. A polyurethane having a hardness in the range of 60 to 95 (B) of 4.99 to 69.99 parts by weight and a reactive compatibilizer having no hydroxyl group (C) of 0.01 to 5 parts by weight ((A), The total of (B) and (C) relates to a thermoplastic elastomer resin composition containing 100 parts by weight.

  Hereinafter, the present invention will be described in detail.

The thermoplastic elastomer resin composition of the present invention include ethylene · alpha-olefin copolymer having a weight average molecular weight which density is measured by 890~920kg ^/ m 3, GPC is in the range of 40,000 to 100,000 (A) 30 ~ 95 parts by weight, thermoplastic polyurethane (B) 4.99 to 69.99 parts by weight and reactive compatibilizer (C) having no hydroxyl group 0.01 to 5 parts by weight ((A), (B) and ( The total of C) includes 100 parts by weight).

  The ethylene / α-olefin copolymer (A) constituting the thermoplastic elastomer resin composition of the present invention is obtained by copolymerizing ethylene and an α-olefin having 3 or more carbon atoms. Here, examples of the α-olefin having 3 or more carbon atoms include propylene, butene-1, pentene-1, hexene-1, 4-methyl-1-pentene, heptene-1, octene-1, nonene-1, and decene. -1, undecene-1, dodecene-1, tridecene-1, tetradecene-1, pentadecene-1, hexadecene-1, heptadecene-1, octadecene-1, nonadecene-1, eicosene-1, etc., preferably butene -1, pentene-1, hexene-1, 4-methyl-1-pentene, heptene-1, octene-1, nonene-1, decene-1, undecene-1, dodecene-1, tridecene-1, tetradecene-1 , Pentadecene-1, hexadecene-1, heptadecene-1, octadecene-1, nonadecene-1, and eicosene-1. Two or more of these can also be used, and these α-olefins are usually copolymerized in an amount of 1 to 40% by weight. This copolymer can be obtained by copolymerizing ethylene and an α-olefin using a catalyst system having a specific metallocene compound and an organometallic compound as basic components.

The density of the ethylene / α-olefin copolymer (A) is 890 to 920 kg / m ³ . It is preferably 915 kg / m ³ or less, more preferably 0.913 kg / m ³ or less. The lower limit of the density is 890 kg / m ³ or more and preferably 900 kg / m ³ or more from the viewpoint of heat resistance. When the density exceeds 920 kg / cm ³ , the hysteresis loss rate increases and the elastic properties are impaired, which is not preferable. When the density is smaller than 890 kg / m ³ , the hysteresis loss is decreased, but the heat resistance is impaired, which is not preferable.

  The thermoplastic polyurethane (B) constituting the thermoplastic elastomer resin composition of the present invention has a JIS A hardness in the range of 60 to 95, and is subject to any restrictions as long as it belongs to the category of thermoplastic polyurethane. It is possible to use without. For example, adipate-based thermoplastic polyurethane, polyether-based thermoplastic polyurethane, polycaprolactone-based thermoplastic polyurethane, polycarbonate-based thermoplastic polyurethane, polyester-based thermoplastic polyurethane, acrylic-based thermoplastic polyurethane, phenol-based thermoplastic polyurethane, epoxy-based thermoplastic polyurethane , Polybutadiene-based thermoplastic polyurethane, etc. Among them, adipic acid-based thermoplastic polyurethane using adipic acid ester in the soft segment, polyether-based thermoplastic polyurethane using polyether, Polycaprolactam-based thermoplastic polyurethanes and polycarbonate-based thermoplastic polyurethanes using polycaprolactam are preferred. The esters of adipic San'netsu thermoplastic polyurethane with ethylene glycol and / or butylene glycol more preferred.

  The thermoplastic polyurethane (B) has a JIS A hardness of 50 to 95, preferably 55 to 90. When the JIS A hardness is less than 50, the rubber-like properties are impaired, which is not preferable. When it exceeds 95, the flexibility is impaired, which is not preferable.

  The 100% modulus of the thermoplastic polyurethane (B) is preferably in the range of 2 to 12 MPa, more preferably in the range of 2.5 to 10 MPa. When the 100% modulus is 2 or more, the rubbery properties are not impaired, and when it is 12 MPa or less, the flexibility is not impaired, which is preferable.

  As such a thermoplastic polyurethane, for example, (trade name) Miractolan E180 (manufactured by Japan Miractolan Co., Ltd.), (trade name) Miractolan E385 (manufactured by Japan Miractolan Co., Ltd.), (trade name) Miractolan E585 (Nihon Miractolan ( Etc.) can also be obtained as commercial products.

The reactive compatibilizer (C) constituting the thermoplastic elastomer resin composition of the present invention is limited as long as it is a polymer having a functional group capable of reacting with a terminal hydroxyl group of a polyol contained in the thermoplastic polyurethane. is not. Examples of the functional group capable of reacting with the terminal hydroxyl group of the polyol contained in the thermoplastic polyurethane include a carboxylic acid group, a dicarboxylic acid group or an acid anhydride group thereof, a carboxylic acid group, a carboxylic acid ester group, an acyloxy group, an epoxy group, and an amino group. Groups and the like. Specific examples include the following polymers (i) to (iv).
(I) A graft copolymer of a vinyl monomer having a functional group selected from the group consisting of a carboxylic acid group, a dicarboxylic acid group or an anhydride thereof, a carboxylic acid group, a carboxylic acid ester group, and an acyloxy group and polyethylene (ii) A copolymer of vinyl monomer and ethylene having a functional group selected from the group consisting of a carboxylic acid group, a dicarboxylic acid group or an anhydride thereof, a carboxylic acid group, a carboxylic acid ester group and an acyloxy group (iii) an epoxy group (Iv) a polymer having an amino group (i) a functional group selected from the group consisting of a carboxylic acid group, a dicarboxylic acid group or an anhydride thereof, a carboxylic acid group, a carboxylic acid ester group, and an acyloxy group As a graft copolymer of a vinyl monomer having polyethylene and polyethylene, anhydrous Examples thereof include oleic acid-modified polyethylene, which can be produced by a known polymerization method.

  Examples of maleic anhydride-modified polyethylene include (trade name) Umex 2000 (maleic anhydride-modified polyethylene, acid value: 30 mg KOH / g, weight average molecular weight: 20000, modification ratio: 5% by weight) (Sanyo Chemical Co., Ltd.) Can be purchased as a commercial product.

  (Ii) Copolymers of vinyl monomers and ethylene having a functional group selected from the group consisting of carboxylic acid groups, dicarboxylic acid groups or their anhydrides, carboxylic acid groups, carboxylic acid ester groups, and acyloxy groups are known. It can be produced by a polymerization method.

  (Iii) An ethylene polymer having an epoxy group includes an ethylene glycidyl methacrylate copolymer, and (v) an ethylene polymer having an amino group includes polyethyleneimine.

  The component ratio of the ethylene / α-olefin copolymer (A) is 30 to 95 parts by weight, preferably 40 to 90 parts by weight. If the component ratio of the ethylene / α-olefin copolymer (A) exceeds 95 parts by weight, the effect of improving deformation recovery is small, and if it is less than 30 parts by weight, the moldability is impaired.

  The component ratio of the thermoplastic polyurethane elastomer (B) is 4.99 to 69.99 parts by weight, preferably 4.99 to 50 parts by weight. If the component ratio of the thermoplastic polyurethane elastomer (B) exceeds 69.99 parts by weight, moldability is impaired, and if it is less than 4.99 parts by weight, the effect of improving the hysteresis loss rate is small. It is not preferable.

  The component ratio of the compatibilizer (C) is 0.01 to 5 parts by weight, preferably 0.1 parts by weight or more. If the component ratio of the compatibilizer (C) exceeds 5 parts by weight, the moldability is impaired, and it is not preferable, and if it is less than 0.01 part by weight, the effect of improving the hysteresis loss rate is small, which is not preferable. By blending the compatibilizing agent, the compatibility between the ethylene / α-olefin copolymer and the thermoplastic polyurethane is improved, the hysteresis loss is reduced, and the elastic property is improved.

  The hysteresis loss rate at 23 ° C. of the thermoplastic elastomer resin composition of the present invention is preferably 30% or less, and more preferably 28% or less. When the hysteresis loss rate is 30% or less, the elastic property is excellent.

  The strain recovery rate at 45 ° C. of the thermoplastic elastomer resin composition of the present invention is preferably 70% or more, and more preferably 75% or more. When the strain recovery rate is 70% or more, the deformation of the molded product is small.

  Since the bending elastic modulus of the obtained thermoplastic elastomer composition is in the range of 30 MPa to 110 MPa, the cushioning property is excellent, which is preferable.

  According to JIS K 7210 of the thermoplastic elastomer resin composition, the melt flow rate (MFR) measured at 190 ° C. and a load of 21.18 N is preferably 0.1 to 10 g / 10 minutes because of excellent moldability.

  The melting point of the thermoplastic elastomer resin composition of the present invention is preferably 80 ° C. or higher at which heat resistance can be maintained, and more preferably 85 ° C. or higher because the heat durability is improved. If necessary, polymer modifiers such as styrene isoprene copolymers, styrene butadiene copolymers, and hydrogenated copolymers thereof can be blended as polybutadiene, polyisoprene, and styrene-based thermoplastic elastomers. Furthermore, phthalate ester-based, trimellitic acid ester-based, fatty acid-based, epoxy-based, adipic acid ester-based, polyester-based plasticizers, known hindered phenol-based, sulfur-based, phosphorus-based, amine-based antioxidants, Hindered amine, triazole, benzophenone, benzoate, nickel, salicyl and other light stabilizers, antistatic agents, epoxy compounds, isocyanate compounds, compounds having reactive groups such as carbodiimide compounds, metal deactivators Organic and inorganic nucleating agents, neutralizing agents, antacids, antibacterial agents, fluorescent brighteners, fillers, flame retardants, flame retardant aids, organic and inorganic pigments can be added.

  The thermoplastic elastomer resin composition of the present invention is excellent in deformation recovery, and has heat resistance capable of maintaining its shape even in an environment where the temperature tends to increase due to summer or body temperature.

  Although there is no restriction | limiting in particular in the shaping | molding method of a thermoplastic elastomer resin composition, and an application, It is used for the use for which a deformation | transformation recoverability is calculated | required when it removes a load, after making it deform | transform continuously by the continuous load.

  For example, by injection molding or extrusion molding, a flat body, rod shape, spiral shape, or a molded body having an irregular or hollow cross section is applied to a use similar to a buffer spring, or applied to a support such as a cushion. Cases. As an example, a three-dimensional network structure in which a continuous linear body composed of a plurality of strands obtained by extrusion is twisted into a three-dimensional random loop, and at least a part of contact portions of the plurality of loops is fused. And a structure made of a fiber assembly exemplified in Japanese Patent Application Laid-Open No. 2012-112072, Japanese Patent Application Laid-Open No. 5-163657, and the like.

  According to the present invention, a thermoplastic elastomer composition having excellent heat resistance and deformation recovery properties, and excellent heat resistance and deformation recovery properties can be obtained.

  The thermoplastic elastomer composition according to the present invention has excellent strain recovery properties, such as office chairs, furniture, sofas, bed pads, mattresses, vehicle seats such as trains, automobiles, motorcycles, strollers, and child seats, floor mats and collisions. In addition, it is possible to provide a resin suitable for a cushion material used for an impact absorbing mat or the like such as a pinching prevention member. In particular, it has become possible to provide a resin composition suitable for cushioning materials such as office chairs, furniture, sofas, bed pads, mattresses, etc., which are prone to heat up due to summer or body temperature.

Next, the present invention will be described with reference to specific examples, but the present invention is not limited thereto. In addition, evaluation of the characteristic value in an Example is as follows.
(1) Density Using a MI meter with a hood, a sample extruded at 190 ° C. under a 5 kg load was slowly cooled in the hood for 5 minutes, and then measured with a 23 ° C. density gradient tube.
(2) GPC
GPC in the present invention is measured under the following conditions.
[Apparatus] HLC-8121GPC / HT manufactured by Tosoh Corporation
[Measurement conditions] Column: TSKgel GMHHR-H (20) HT × 3, eluent: trichlorobenzene + antioxidant (BHT 0.05%), flow rate: 1.0 ml / min, sample concentration: 1.0 mg / ml , Injection amount: 0.3 ml, column temperature: 140 ° C., detector: HLC-8121GPC / HT
(3) MFR
According to JIS K7210, measurement was performed at a temperature of 190 ° C. and a load of 21.18 N.
(4) Strain recovery rate Using a 50-ton compression molding machine (AWFA-50, manufactured by Kondo), a 1 mm sheet was produced under conditions of a temperature of 200 ° C and a cooling temperature of 10 ° C. A strip having a width of 10 mm and a length of 100 mm was cut out from the obtained sheet and marked with a pre-test distance of 50 mm. Using a tensile tester (RTG-1210, manufactured by Orientec Co., Ltd.), it was fixed to a gripping tool having a distance of 50 mm under an atmosphere of 45 ° C., deformed to 75 mm at a tensile speed of 50 mm / min, and held for 60 minutes. Thereafter, the test piece was instantaneously removed from the gripping tool, allowed to stand for 10 minutes in an atmosphere at a temperature of 23 ° C., the distance of the mark was measured using a caliper, and the strain recovery rate was determined by the following formula.

Strain recovery rate = distance before test / distance after test × 100
(5) Hysteresis loss rate A 1 mm sheet was produced using a 50-ton compression molding machine (AWFA-50, manufactured by Shinfuji) at a temperature of 200 ° C and a cooling temperature of 10 ° C. A strip with a width of 10 mm and a length of 100 mm is cut out from the obtained sheet, fixed to a gripping tool with a distance of 50 mm, pulled to 25% at a speed of 50 mm / min, and zeroed at the same speed without a hold time. Return to

  Hysteresis loss is obtained according to the following formula, assuming that the tensile energy (EC) indicated by the stress curve at the time of tensile deformation and the tensile energy (EC ′) indicated by the stress curve at the time of deforcement.

Hysteresis loss (%) = (EC−EC ′) / EC × 100
WC = ∫PdT (area when deformed from 0% to 25%)
WC '= ∫PdT (area when deformed from 25% to 0%)
For simplicity, it can be calculated by data analysis using a personal computer. (Average value of n = 5)
(6) Bending elastic modulus Bending elastic modulus Based on JIS-K6922-2, it measured under the conditions of 64 mm between spans and a bending speed of 2 mm / min using a multipurpose test piece injection-molded under predetermined conditions.

Production Example 1
[Preparation of modified clay compound]
29.7 g of N, N-dimethyl-octadecylamine and 10 mL of 37% hydrochloric acid were added to 500 mL of deionized water to prepare an N, N-dimethyl-octadecylammonium hydrochloride aqueous solution. 100 g of montmorillonite having an average particle size of 7.8 μm (prepared by pulverizing Kunipia F (manufactured by Kunimine Kogyo Co., Ltd.) with a jet pulverizer was added to the hydrochloride aqueous solution and allowed to react for 6 hours. After completion of the reaction, the reaction solution was filtered, and the resulting cake was dried under reduced pressure for 6 hours to obtain 120 g of a modified clay compound. The amount of organic cation introduced was 1.0 mmol / g.
[Preparation of catalyst]
In a 20 L stainless steel container under a nitrogen atmosphere, 3.3 L of heptane, hexane solution of triethylaluminum (TEAL) (diluted at 20 wt%) is 1.125 mol (0.9 L) per aluminum atom, and [Preparation of Modified Clay Compound] 38 g of the prepared modified clay compound was added and stirred for 1 hour. Thereto was added 1.25 mmol of diphenylmethylene (4-phenyl-1-indenyl) (2,7-di-t-butyl-9-fluorenyl) zirconium dichloride synthesized according to Production Example 1 and stirred for 12 hours. A catalyst was prepared by adding 5.8 L of an aliphatic saturated hydrocarbon solvent (IP solvent 2835 (manufactured by Idemitsu Petrochemical Co., Ltd.)) to the obtained suspension system (zirconium concentration 0.125 mmol / L).
[polymerization]
Polymerization was carried out using a tank reactor. Ethylene and hexene-1 was pressed into the reactor continuously, the total pressure 950kgf / cm ^2, 72mol% ethylene concentrations, and hexene-1 concentration was set to be 28 mol%. The reactor was then stirred at 1500 rpm.

Then, the prepared catalyst was continuously supplied to the reactor, and polymerization was performed so that the average temperature was maintained at 240 ° C. As a result, an ethylene / hexene-1 copolymer having a density of 905 kg / m ³ and MFR of 12 g / 10 min was obtained.

Production Example 2
Polymerization was carried out in the same manner as in Production Example 1 except that the polymerization was carried out so that the ethylene concentration was 73 mol%, the hexene-1 concentration was 27 mol%, and the average temperature was maintained at 220 ° C. As a result, an ethylene / hexene-1 copolymer having a density of 905 kg / m ³ and an MFR of 2.0 g / 10 min was obtained.

Production Example 3
Polymerization was carried out in the same manner as in Production Example 1 except that the polymerization was carried out so that the ethylene concentration was 76 mol%, the hexene-1 concentration was 24 mol%, and the average temperature was maintained at 240 ° C. As a result, an ethylene / hexene-1 copolymer having a density of 915 kg / m ³ and MFR of 12 g / 10 min was obtained.

Production Example 4
Polymerization was carried out in the same manner as in Production Example 1 except that the polymerization was carried out so that the ethylene concentration was 79 mol%, the hexene-1 concentration was 21 mol%, and the average temperature was maintained at 240 ° C. As a result, an ethylene / hexene-1 copolymer having a density of 925 kg / m ³ and an MFR of 4.0 g / 10 min was obtained.

Example 1
As the ethylene / α-olefin copolymer (A), 79.5 parts by weight of an ethylene / hexene-1 copolymer (A-1) polymerized in Production Example 1 having a density of 905 kg / m ³ and MFR of 12 g / 10 min and adipate -Based thermoplastic polyurethane elastomer (B-1) (trade name: Miractolan E180, JIS A hardness 80) and a compatibilizer containing maleic anhydride group-containing modified polyethylene (acid value: 30 mgKOH / g, weight average molecular weight: 20000) , Modification ratio: 5% by weight) 0.5 parts by weight was blended and melt kneaded using a twin screw extruder (manufactured by Toyo Seiki Co., Ltd.) at a screw rotation speed of 20 rpm and a barrel set temperature of 200 ° C. A thermoplastic elastomer resin composition was obtained.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 78% and a hysteresis loss rate of 28%, and was excellent in heat resistance and recoverability.

Example 2
Ethylene / α-olefin copolymer (A-1) (density 905 kg / m ³ MFR = 12) 55 parts by weight and ether-based thermoplastic polyurethane elastomer (B-2) (trade name: Milactolan E380, JISA hardness 80) 40 5 parts by weight of maleic anhydride group-containing modified polyethylene (acid value: 30 mgKOH / g, weight average molecular weight: 20000, modification ratio: 5% by weight) is blended with parts by weight and the compatibilizing agent, and heated in the same manner as in Example 1. A plastic elastomer resin composition was obtained.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 82% and a hysteresis loss rate of 24%, and was excellent in heat resistance and recoverability.

Example 3
As an ethylene / α-olefin copolymer (A), 79 parts by weight of an ethylene / hexene-1 copolymer (A-2) polymerized in Production Example 2 with a density of 905 kg / m ³ and an MFR of 2.0 g / 10 min and ether -Based thermoplastic polyurethane elastomer (B-3) (trade name: milactolan E395, JISA hardness 95) and maleic anhydride group-containing modified polyethylene (acid value: 30 mgKOH / g, weight average molecular weight: 20000, modification ratio: 5 wt%) 1 part by weight was blended, and a thermoplastic elastomer resin composition was obtained in the same manner as in Example 1.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 80% and a hysteresis loss rate of 25%, and was excellent in heat resistance and recoverability.

Example 4
As an ethylene / α-olefin copolymer, 67 parts by weight of an ethylene / hexene-1 copolymer (A-3) polymerized in Production Example 3 with a density of 915 kg / m ³ and MFR of 4.0 g / 10 min and an adipate thermoplastic 30 parts by weight of polyurethane elastomer (B-1) and 3 parts by weight of compatibilizer C were blended, and a thermoplastic elastomer resin composition was obtained in the same manner as in Example 1.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 78% and a hysteresis loss rate of 29%, and was excellent in heat resistance and recoverability.

Comparative Example 1
A sample was prepared in the same manner as in Example 1, except that the thermoplastic polyurethane was not blended and the ethylene / α-olefin copolymer (A-1) was 100 parts by weight. The strain recovery rate of the ethylene / α-olefin copolymer (A-1) was 68%, the hysteresis loss rate was 33%, and the heat resistance and deformation recovery properties were poor.

Comparative Example 2
80 parts by weight of the ethylene / α-olefin copolymer (A-1) and 20 parts by weight of the adipate thermoplastic polyurethane (B-1) are blended, and the thermoplastic elastomer resin composition is prepared in the same manner as in Example 1. Obtained.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 65% and a hysteresis loss rate of 39%, and had a high hysteresis loss rate and poor deformation recovery.

Comparative Example 3
As the ethylene-alpha-olefin copolymer, density 925 kg ^/ m 3 was polymerized in Preparation Example 4, MFR4.0g / 10 min ethylene-hexene-1 copolymer (A-4) 75 parts by weight of an ether-based heat Blended with 20 parts by weight of plastic polyurethane (B-3), blended with 5 parts by weight of maleic anhydride group-containing modified polyethylene (acid value: 30 mg KOH / g, weight average molecular weight: 20000, modification ratio: 5% by weight) A thermoplastic elastomer resin composition was obtained in the same manner as in Example 1.

  The obtained thermoplastic elastomer resin composition had a strain recovery rate of 67% and a hysteresis loss rate of 31%, and was inferior in heat resistance and deformation recovery properties.

Claims (5)

30 to 95 parts by weight of ethylene / α-olefin copolymer (A) having a density of 890 to 920 kg / m ³ and a weight average molecular weight measured by GPC of 40,000 to 100,000, and a JIS A hardness of 60 to 95 to 5.9 to 69.99 parts by weight of thermoplastic polyurethane (B) and 0.01 to 5 parts by weight of reactive compatibilizer (C) ((A), (B) and (C) A thermoplastic elastomer resin composition containing 100 parts by weight in total. The thermoplastic elastomer composition according to claim 1, wherein the reactive compatibilizer is maleic anhydride-modified polyethylene.   The thermoplastic elastomer composition according to claim 1 or 2, wherein a melt flow rate measured at 190 ° C and a load of 21.18 N is in a range of 0.1 to 10 g / 10 minutes.   The thermoplastic elastomer composition according to any one of claims 1 to 3, wherein a hysteresis loss rate at 23 ° C is 30% or less and a deformation recovery rate at 45 ° C is 70% or more.   The thermoplastic elastomer composition according to any one of claims 1 to 4, which has a flexural modulus in a range of 30 to 110 MPa.