JP6007622B2 - Thermoplastic elastomer resin composition - Google Patents

Description

  The present invention relates to a low-hardness thermoplastic elastomer resin composition that is excellent in heat-fusibility with polar and non-polar resins in insert molding and that could not be achieved with a thermoplastic polyester elastomer alone.

  Thermoplastic polyester elastomers with crystalline aromatic polyester units as hard segments and aliphatic polyether units as soft segments have the characteristics of rubber elasticity, high heat resistance, low temperature characteristics, oil resistance, chemical resistance In addition, it is an elastomer having excellent mechanical properties and good injection molding. However, in the case of a polyester elastomer having such a crystalline aromatic polyester unit as a hard segment, a resin composition having a surface hardness of 70 A or less cannot be injection-molded because the crystallization speed is slow, and the surface hardness of 70 A or less has been hitherto. Could not be expanded to applications that require

  As a means for softening such a thermoplastic polyester elastomer, a composition comprising a block made of a polymer of styrene or a derivative thereof and an isoprene homopolymer, or a block copolymer of isoprene and butadiene and a polyester elastomer (for example, Patent Document 1), a composition comprising a hydrogenated derivative of a styrene butadiene block copolymer and a polyester elastomer (for example, Patent Document 2), and further a composition in which a plasticizer is added to the above composition (for example, Patent Documents 3 to 7) Is already known.

Japanese Patent Laid-Open No. 3-100045 JP-A-1-193352 JP-A-2-043251 JP-A-3-109458 JP-A-8-277359 JP-A-8-72204 JP-A-9-12487

In the conventional proposals shown above, a flexible resin composition can be obtained as compared with conventional polyester block copolymers, but there is a limit to the flexibility that can be achieved with these techniques. When trying to obtain a more flexible material, mold sticking due to a flexible component occurs and the injection moldability is remarkably deteriorated, the heat resistance and mechanical properties are greatly deteriorated, or surface peeling due to insufficient compatibility. In addition, since the plasticizer bleeds out, the mold stains become severe, and the appearance of the molded product is greatly impaired, there are various problems in actual use.
Further, the conventional composition has a high melt viscosity and lacks fluidity, so that it is not suitable for a thin-walled molded product, and the injection moldability is deteriorated. For this reason, the plasticizer improves the fluidity, but a large amount of addition is necessary. However, the bleedout of the plasticizer becomes violent, and further, the problem that the adhesiveness with a different kind of resin greatly decreases occurs.

  The object of the present invention is to solve the above-mentioned problems in the prior art, and not only is excellent in flexibility, heat resistance and mechanical properties, but also has good melt fluidity and release properties. An object of the present invention is to provide a molded product having excellent surface appearance of the molded product by having excellent injection moldability, no surface peeling of the molded product, and no bleeding out. In addition, it is not only excellent in adhesion with polycarbonate resin, ABS resin, PBT resin, AES resin, ASA resin, which is a hard material that is easily bonded to polyester thermoplastic elastomer, but also crystalline olefin resin It is also possible to bond with.

  As a result of intensive studies to solve the above problems, the present inventors have found that a low molecular weight polymer and a high molecular weight of a hydrogenated styrene elastomer are compared with a polyester elastomer that is excellent in mechanical strength and heat resistance. Combined with a polymer and further blended with an ester plasticizer, it retains flexibility and good moldability, which is not found in general-purpose polyester elastomers. Since it has a sea-island structure as a morphology, it has been found that both polymer characteristics are maintained in a well-balanced manner and the above-mentioned problems are solved, and the present invention has been achieved.

That is, the present invention relates to a high-melting-point crystalline polymer segment (a) comprising a polyester unit obtained from an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol having a molecular weight of 300 or less, and a low-melting-point polymer segment (b ) Is a polyester block copolymer (A) having a melt speed η _A of 100 to 200 Pa · s when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C., 30 to 70 parts by mass, shear 55-15 parts by mass of hydrogenated styrene / conjugated diene block copolymer (B-1) having a melt viscosity η _B-1 of 1200-2700 Pa · s when the rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C. styrene shear rate γ is 60 sec ^-1, the melt viscosity eta _B-2 at a resin temperature of 210 ° C. is 3000 Pa · s or more, 1 to 10 parts by mass of hydrogenated product (B-2) of diene block copolymer, 0 to 10 parts by mass of styrene / conjugated diene block copolymer (C-1) modified with maleic acid, and glycidyl modified A total of 100 parts by mass of (A), (B-1), (B-2), (C-1), and (C-2) including 1 to 10 parts by mass of the olefin copolymer (C-2). Is a thermoplastic elastomer resin composition containing 1 to 25 parts by mass of an ester type plasticizer (D).

  The present invention is flexible and rich in elasticity, excellent in injection moldability, has high mechanical properties, reduces bleed materials at low and high temperatures, has a good appearance of the molded product, and has polarity and insert molding. Provided is a thermoplastic elastomer resin composition that is also excellent in heat-fusibility with a nonpolar resin. The thermoplastic elastomer resin composition of the present invention is excellent in adhesiveness with a polycarbonate resin, ABS resin, PBT resin, AES resin, and ASA resin, which are hard materials to which a polyester-based thermoplastic elastomer is easily bonded. In addition, since it is possible to bond with a crystalline olefin resin, it is possible to provide a composite molded body composed of various two-color molding combinations without limiting the resin material.

  The high melting point crystalline polymer segment (a) of the polyester block copolymer (A) used in the present invention is mainly formed from an aromatic dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof. Specific examples of the aromatic dicarboxylic acid that is polyester include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, and the like.

  Specific examples of the diol include aliphatic diols having a molecular weight of 300 or less, such as 1.4-butanediol, ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, and neopentyl glycol.

  These dicarboxylic acids, their derivatives, diols and their derivatives may be used in combination of two or more. Preferred high melting crystalline polymer segments are polybutylene terephthalate units derived from terephthalic acid or dimethyl terephthalate and 1,4-butanediol.

  The low melting point polymer segment (b) of the polyester block copolymer (A) used in the present invention is an aliphatic polyether or an aliphatic polyester. Specific examples of the aliphatic polyether include polyoxyethylene glycol, polyoxypropylene glycol, polyoxytrimethylene glycol, polyoxytetramethylene glycol, polyoxyhexamethylene glycol and the like. A specific example of the aliphatic polyester is poly (ε-caprolactone). As the low melting point polymer segment (b), an aliphatic polyether is preferable, and polyoxytetramethylene glycol is particularly preferable.

The copolymerization amount of the low melting point polymer segment (b) of the polyester block copolymer (A) used in the present invention is preferably 50 to 90% by weight, more preferably 60 to 80% by weight.
The polyester block copolymer (A) used in the present invention preferably occupies 70% by weight or more, preferably 80% by weight or more in the high-melting crystalline polymer segment (a) and the low-melting polymer segment (b). More preferably, it occupies 90% by weight or more. The high melting point crystalline polymer segment (a) and the low melting point polymer segment (b) may be 100% by weight.

The polyester block copolymer (A) used in the present invention has a melt viscosity η _A of 100 to 200 Pa · s when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C. As described below, since it is important for controlling the morphology to provide a difference in the viscosity ratio with the component (B-1), the melt viscosity η _A of the polyester block copolymer (A) is within this range. There must be. The melt viscosity η _A of the polyester block copolymer (A) is preferably 120 to 200 Pa · s, and more preferably 140 to 200 Pa · s.

  The polyester block copolymer (A) used in the present invention can be produced by a known method. Specific examples thereof include a lower alcohol diester of an aromatic dicarboxylic acid, an excessive amount of an aliphatic diol, and a low melting point. Examples thereof include a method of subjecting a polymer segment component to a transesterification reaction in the presence of a catalyst and polycondensing the resulting reaction product.

  In the thermoplastic elastomer resin composition of the present invention, the hydrogenated product (B-1) and the component (B-2) of the styrene / conjugated diene block copolymer having the above characteristics are heavy components mainly composed of an aromatic vinyl compound. It is a hydrogenated product of a block copolymer comprising at least two polymer blocks A and at least one polymer block B mainly composed of a conjugated diene compound. For example, it is a hydrogenated product of a block copolymer of an aromatic vinyl compound-conjugated diene compound having a structure such as ABA, BABA, ABBABA, or the like.

  The polymer block A mainly composed of an aromatic vinyl compound may be a polymer composed only of an aromatic vinyl compound or a copolymer of an aromatic vinyl compound and less than 50% by mass of a conjugated diene compound. The polymer block B mainly composed of a conjugated diene compound may be a polymer composed only of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound of less than 50% by mass.

Examples of the aromatic vinyl compound include styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene and the like, and these may be used alone or in combination of two or more. Among these, styrene is preferable from the viewpoint of thermal fusion with a polyester resin. Examples of the optional conjugated diene compound in the polymer block A include butadiene, isoprene, 1,3-pentadiene, and 2,3-dimethyl-1,3-butadiene. May be used. Among these, butadiene and isoprene are preferable from the viewpoint of heat-fusibility to the polyester resin. More preferred is isoprene.
In the present invention, the aromatic vinyl compound content is preferably 35% by mass or less, more preferably 30% by mass or less, in the block copolymer, from the viewpoint of heat fusion strength with respect to the polyester resin that is the adherend. Yes, as a preferred lower limit, it is 1% by mass or more, more preferably 5% by mass or more. Further, from the viewpoint of heat fusion strength with respect to the polyester resin as the adherend, the polymer block A is mainly composed of styrene, and the styrene content is preferably 35% by mass or less, more preferably in the block copolymer. Is preferably 30% by mass or less, and a preferable lower limit is 1% by mass or more, more preferably 5% by mass or more.

  The components (B-1) and (B-2) are hydrogenated products, and the hydrogenation rate is preferably 50% or more, more preferably 90% or more in terms of heat-fusibility to the polyester resin. is there.

The melt viscosity η _B-1 of the component (B-1) is preferably 1200 to 2600 Pa · s, more preferably 1400 to 2500 Pa · s, and the melt viscosity η _B-2 of the component (B-2) is Preferably it is 3000-5000 Pa.s, More preferably, it is 3500-4000 Pa.s. Moreover, the polyester block copolymer (A) of the melt viscosity eta _A and the styrene-conjugated diene block copolymer hydrogenated product of (B-1) the ratio of the melt viscosity _{η B-1 (η B-} 1 / η A ) Is preferably 7-15, more preferably 7-10. By making a difference in the viscosity ratio in this way, the compatibility is further improved and the morphology can be controlled. The molecular structure of the styrene / conjugated diene block copolymer may be linear, branched, radial, or any combination thereof. Preferably it is linear.

  As the components (B-1) and (B-2), styrene-ethylene-butylene-styrene block copolymer (SEBS), which is a hydrogenated product of styrene-butadiene-styrene block copolymer (SBS), styrene -Hydrogenated product of styrene-ethylene / propylene-styrene block copolymer (SEPS), hydrogenated product of isoprene-styrene block copolymer (SIS), hydrogenated product of styrene-butadiene / isoprene-styrene block copolymer (SBIS) Styrene-ethylene / ethylene / propylene / styrene block copolymer (SEEPS), styrene / butadiene / butylene / styrene block copolymer (partially hydrogenated styrene / butadiene / styrene block copolymer, SBBS), etc. Can do. In view of the effects of the present invention, the components (B-1) and (B-2) are preferably hydrogenated, and SEPS, SEEPS, and SEBS are preferred, and particularly preferably, in terms of heat-fusibility to the polyester resin. SEBS.

The maleic acid-modified styrene / conjugated diene block copolymer (C-1) and glycidyl-modified olefin copolymer (C-2) used in the present invention are a polyester block copolymer and a styrene / conjugated diene block. Used to improve the compatibility of the copolymer hydrogenation. In consideration of the color, it is preferable to use the component (C-2) alone or the component (C-1) and the component (C-2) in combination.
The component (C-1) is preferably a hydrogenated product of a maleic acid-modified styrene / conjugated diene block copolymer. Examples of hydrogenated styrene / conjugated diene block copolymers include styrene-ethylene / butylene-styrene block copolymers (SEBS), which are hydrogenated styrene-butadiene-styrene block copolymers (SBS), and styrene- Hydrogenated product of isoprene-styrene block copolymer (SIS), hydrogenated product of styrene-ethylene / propylene-styrene block copolymer (SEPS), styrene-butadiene / isoprene-styrene block copolymer (SBIS) Some styrene-ethylene / ethylene / propylene / styrene block copolymers (SEEPS), styrene / butadiene / butylene / styrene block copolymers (partially hydrogenated styrene / butadiene / styrene block copolymers, SBBS), and the like. it can. Maleic acid-modified styrene-ethylene-butylene-styrene block copolymer (SEBS) is preferred.

  The component (C-2) is a copolymer containing olefins such as ethylene and propylene and a glycidyl-modified monomer as constituent components. Examples of the glycidyl-modified monomer include glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, and glycidyl ether of hydroxyalkyl (meth) acrylate. In addition, acrylic acid, methacrylic acid, esters thereof, and the like may be copolymerized.

  In the present invention, the hydrogenated product (B-1) of the styrene / conjugated diene block copolymer is 55 to 70 parts by mass, preferably 40 to 60 parts by mass with respect to the polyester block copolymer (A). 15 parts by mass, preferably 45 to 25 parts by mass, 1 to 10 parts by mass, preferably 5 to 10 parts by mass of the hydrogenated product (B-2) of the styrene / conjugated diene block copolymer, and modified with maleic acid. 0-10 parts by mass of the styrene / conjugated diene block copolymer (C-1), preferably 5-10 parts by mass, and 1-10 parts by mass of the glycidyl-modified olefin copolymer (C-2), Preferably 5-10 mass parts is mix | blended. Outside the above blending range, the flexibility, heat resistance, moldability, heat-fusibility, appearance and the like of the resin composition become insufficient, which is not preferable.

  Specific examples of the ester type plasticizer (D) used in the present invention include phthalates such as dioctyl phthalate, dibutyl phthalate, diethyl phthalate, butyl benzyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, diundecyl phthalate, and diisononyl phthalate. Acid ester plasticizer, trimellitic acid octyl ester, trimellitic acid isononyl ester, trimellitic acid ester plasticizer such as trimellitic acid isodecyl ester, pyromellitic acid ester plasticizer such as pyromellitic acid octyl ester, Diethylene glycol dibenzoate, neopentyl glycol dibenzoate, propylene glycol dibenzoate, pentaerythritol tetrabenzoate, triethylene glycol dibenzo Over DOO, polyethylene glycol dibenzoate, benzoate plasticizers such as trimethylolethane benzoate. Among these, trimellitic acid ester plasticizers are desirable from the viewpoint of suppressing bleeding out and reducing mold contamination.

  In the thermoplastic elastomer resin composition of the present invention, the ester plasticizer (D) includes the component (A), the component (B-1), the component (B-2), the component (C-1), And 1-25 mass parts with respect to a total of 100 mass parts of the said (C-2) component, Preferably 10-20 mass parts is mix | blended. When the blending amount of the component (D) is less than the above range, improvement in flexibility is not sufficient, and when the blending amount of the component (D) exceeds the above range, bleeding out occurs, which is not preferable.

Furthermore, various additives can be mix | blended with the thermoplastic elastomer resin composition of this invention, or each component which comprises this according to the objective. Additives include known hindered phenol-based, sulfur-based, phosphorus-based, amine-based antioxidants, hindered amine-based, triazole-based, benzophenone-based, benzoate-based, nickel-based, salicyl-based light stabilizers, antistatic agents, etc. Agents, lubricants, molecular modifiers such as peroxides, epoxy compounds, isocyanate compounds, compounds having reactive groups such as carbodiimide compounds, metal deactivators, organic and inorganic nucleating agents, neutralizing agents, control agents Acid agents, antibacterial agents, fluorescent brighteners, fillers, flame retardants, flame retardant aids, organic and inorganic pigments, and the like can be added.
These arbitrary components can be used in the range of 30% by mass or less in the thermoplastic elastomer resin composition. More preferably, it is 20 mass% or less, More preferably, it is 10 mass% or less.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. In addition, the measuring method of the material and evaluation item which were used in the Example is as follows. Unless otherwise indicated, parts and% in the examples are based on mass.

1. Hardness Surface hardness A was measured according to JIS K6253.

2. Bleed-out property 4. Several 2 mm-thick flat plates obtained in the above were superposed and aged in a temperature atmosphere of 0, 23, and 60 ° C. for 30 days, and the surface of the molded product was visually observed to confirm the presence or absence of a bleed-out product. Here, the bleed out is a phenomenon in which a part of the composition in the composition oozes out on the surface of the molded product, and was evaluated according to the following criteria.
○: No change in surface appearance ×: The surface appearance is totally cloudy

3. Measurement of Melt Index (MI Value) Mass of the molten sample that passed through the orifice for a fixed time under a load of 2160 g after heating the sample at 200 ° C. for 5 minutes using a melt indexer according to JIS K7210: 1999 Was measured. This was converted to the number of grams per 10 minutes to obtain the melt index.

4). Injection moldability (release property)
The injection moldability was evaluated by actually molding a 100 × 100 × 2 mmt flat plate. The flat plate was molded by using an injection molding machine (Toshiba Machine Co., Ltd., IS80), forming a flat plate at a cylinder temperature of 200 ° C., a mold temperature of 35 ° C., and a cooling time of 25 seconds. The following criteria were used to evaluate whether there was any problem in the filling and appearance of the molded product and whether or not there was sticking to the mold.
○: No sticking to the mold ×: The entire flat plate sticks to the mold

5. Surface layer peeling In the above-described injection moldability evaluation, it was visually confirmed whether surface layer peeling occurred on the surface of the molded product and in the vicinity of the gate.
○: No peeling of the molded product gate part ×: There is peeling of the molded product gate part

6). Mold Contamination Property In the above-described injection moldability evaluation, mold contamination when a flat plate was molded by 50 shots was visually confirmed.
○: No mold transfer ×: Mold transfer

7). Two-color moldability A composite molded body in which a thermoplastic elastomer resin composition layer and a hard resin layer are heat-sealed. As a manufacturing method thereof, a core material (hard resin) is a flat plate 100 mm square and 1 mm thick in advance. Then, half of the flat plate was masked with tape, and then this flat plate was mounted in a cavity of 100 mm square depth 2 mm, and a skin material (thermoplastic elastomer resin composition) was injection molded. Using a strip-shaped test piece having a width of 25 mm, a length of 100 mm, and a thickness of 2 mm punched from the composite injection molded body obtained from this, a 180 ° C peel peel test was carried out at a tensile rate of 20 mm / min to obtain a skin material layer / The fusion bond peel strength of the core material layer was measured. Here, as the hard resin of the core material, polycarbonate (PC) resin (Iupilon S3000 manufactured by Mitsubishi Engineer Plastics), ABS resin (3001G manufactured by Ube Industries), PMMA resin (Acrypet manufactured by Mitsubishi Rayon Co., Ltd.) VH001), PET resin (Toyobo Co., Ltd. Viropet EMC500) and PP resin (Prime Polymer J-3000G) were used.

(Examples 1-10, Comparative Examples 1-9)
The pre-dried components were weighed according to the blending ratio (mass ratio) shown in Table 1, and melt kneaded at a cylinder temperature of 200 ° C. and a screw rotation speed of 100 rpm with a twin screw extruder (Ikegai Iron Works, PCM30). After extruding into a water bath in a strand shape and cooling, pellets of the resin composition were obtained. The obtained resin composition was subjected to evaluation by molding various test pieces for test using an injection molding machine (Toshiba Machine Co., Ltd., IS80) at a cylinder temperature of 200 ° C. and a mold temperature of 35 ° C. The evaluation results are shown in Table 1.

Each component of Table 1 is as follows. The melt viscosity is a value measured with a capillary rheometer (manufactured by Toyo Seiki Co., Ltd.).
* 1) Component Ai: A polyester / polyether block copolymer having a terephthalic acid / 1,4-butanediol / polyoxytetramethylene glycol (PTMG; number average molecular weight 2000) of 100/78/22 mol% was produced. . Surface hardness 84A, melt viscosity η _A-1 : 182 Pa · s
* 2) Component A-ii: A polyester / polyether block copolymer having a terephthalic acid / 1,4-butanediol / polyoxytetramethylene glycol (PTMG; number average molecular weight 2000) of 100/78/22 mol% was produced. . Surface hardness 84A Melt viscosity η _A-2 : 503 Pa · s
Although it has the same composition as component A-i, the viscosity is increased by extending the polymerization time.
* 3) Component A-iii: A polyester / polyether block copolymer having a terephthalic acid / 1,4-butanediol / polyoxytetramethylene glycol (PTMG; number average molecular weight 2000) of 100/78/22 mol% was produced. . Surface hardness 84A Melt viscosity η _A-2 : 146 Pa · s
Although it has the same composition as component A-i, the viscosity is lowered by shortening the polymerization time.
* 4) Component B-1-i: Tuftec H1221; Thermoplastic elastomer of hydrogenated styrene / ethylene / butadiene block copolymer (manufactured by Asahi Kasei Chemicals Co., Ltd.) Surface hardness A42 Melt viscosity η _B-1 : 1566 Pa · s
* 5) Component B-2: N504; Hydrogenated styrene / ethylene / butadiene block copolymer thermoplastic elastomer (manufactured by Asahi Kasei Chemicals Corporation) Surface hardness A79 Melt viscosity ηB-2: 3500 Pa · s
* 6) Component B-1-ii: Tuftec H1272; Thermoplastic elastomer of hydrogenated styrene-ethylene-butadiene block copolymer (manufactured by Asahi Kasei Chemicals Corporation) Surface hardness A35 Melt viscosity η _B-1 : 2430 Pa · s
* 7) Component B-1-iii: HYBRAR7311: Hydrogenated styrene / isoprene / styrene block copolymer thermoplastic elastomer (manufactured by Kuraray Co., Ltd.) Surface hardness A41 Melt viscosity η _B-2 : 3550 Pa · s
* 8) Component C-1: Tuftec M1943: Maleic anhydride-modified hydrogenated styrene / butadiene / styrene copolymer Surface hardness 67A
* 9) Component C-2: BF-7L: Glycidyl-modified ethylene / methyl acrylate copolymer Surface hardness 18D
* 10) Component Di: Plasticizer Paraffinic oil Diana process oil PW-90 (manufactured by Idemitsu Kosan Co., Ltd.)
* 11) Component D-ii: Plasticizer Trimellitic acid ester Trimex T-08 (manufactured by Kao Corporation)

As is apparent from Examples 1 to 10, the resin composition of the present invention comprises a polyester block copolymer (A) component and a styrene / conjugated diene block copolymer hydrogenated product (B-1), (B- 2) Combining maleic acid-modified styrene / conjugated diene block copolymer (C-1), glycidyl-modified olefin copolymer (C-2), and ester plasticizer (D) component Is flexible and elastic, has excellent injection molding properties, high mechanical properties, reduces bleed materials at low temperatures and warming, and has excellent heat fusion properties with different resins in insert molding. A plastic elastomer resin composition could be obtained.
In Comparative Examples 1 and 2, since the melt viscosity of the component (A) was high and the compatibility was insufficient, the releasability was poor and surface peeling occurred. In Comparative Example 3, since a large amount of the component (B-1) was added, tackiness was generated and the moldability was inferior. In Comparative Example 4, since the amount of component (B-1) added was too small, the flexibility was insufficient. In Comparative Example 5, a large amount of the component (B-2) is added, and due to the high molecular weight, its own domain is very large and affects the two-color moldability. In Comparative Example 6, since the component (B-1) was poorly compatible with the component A, compounding was impossible. In Comparative Example 7, since the plasticizer (Di) was used, the result of severe mold contamination during molding was obtained. In Comparative Example 8, the component (B-2) was not contained, and the plasticizer from the low temperature to the normal temperature could not be retained and bleeded out. In Comparative Example 9, a large amount of the plasticizer (D) component was added, causing a problem of bleeding out.

By this invention, it is flexible and elastic, excellent in injection moldability, has high mechanical properties, reduces bleed materials at low temperature and warming, and is excellent in heat fusion with different resins by insert molding. A thermoplastic elastomer resin composition can be provided. For this reason, a molded product having an excellent appearance without surface layer peeling or bleed-out is obtained by injection molding or the like, including an automobile inner layer skin material and a member that requires tactile sensation. And since it is highly heat-fusible with a hard resin, it is possible to provide a composite molded body that requires cushioning and tactile sensations.

Claims (3)

The main constituents are an aromatic dicarboxylic acid or an ester-forming derivative thereof, a high-melting crystalline polymer segment (a) comprising a polyester unit obtained from an aliphatic diol having a molecular weight of 300 or less, and a low-melting polymer segment (b). 30 to 70 parts by mass of a polyester block copolymer (A) having a melt viscosity η _A of 100 to 200 Pa · s when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C.
55-15 mass of hydrogenated product (B-1) of styrene / conjugated diene block copolymer having a melt viscosity η _B-1 of 1200 to 2700 Pa · s when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C. Part,
1 to 10 parts by mass of hydrogenated styrene / conjugated diene block copolymer (B-2) having a melt viscosity η _B-2 of 3000 Pa · s or more when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C. ,
0-10 parts by mass of maleic acid-modified styrene / conjugated diene block copolymer (C-1),
And 1 to 10 parts by mass of a glycidyl-modified olefin copolymer (C-2),
(A), (B-1), (B-2), (C-1), and ester plasticizer (D) 1 to 25 parts by mass with respect to 100 parts by mass in total. A thermoplastic elastomer resin composition characterized by being blended.   The high-melting crystalline polymer segment (a) of the polyester block copolymer (A) comprises a polybutylene terephthalate unit derived from terephthalic acid or dimethyl terephthalate and 1,4-butanediol, and comprises a low-melting polymer segment. The thermoplastic elastomer resin composition according to claim 1, wherein (b) comprises an aliphatic polyether unit. The melt viscosity η _A of the polyester block copolymer (A) when the shear rate γ is 60 sec ⁻¹ and the resin temperature is 210 ° C., and the melt viscosity of the hydrogenated product (B-1) of the styrene / conjugated diene block copolymer. eta _B-1 ratio _{(η B-1 / η a} ) a thermoplastic elastomer resin composition according to claim 1 or 2, characterized in that 7 to 15.