JPS6248758A - Highly elastic hyrogenated block copolymer composition - Google Patents

Abstract

PURPOSE:The titled composition having improved processing properties, possibility of recycling use, rubber elasticity at high temperature, etc., comprising a specific hydrogenated block copolymer, polystyrene resin, nonaromatic softener for rubber and polyphenylene ether resin. CONSTITUTION:A composition consisting of (A) 100pts.wt. hydrogenated block copolymer obtained by hydrogenating a copolymer comprising of a polymer block having two or more vinyl aromatic compounds (preferably styrene) as a main component and a polymer block having one or more conjugated diene compound (preferably butadiene or isoprene) as a main component, (B) 5-100pts. wt. polystyrene resin, (C) 10-300pts.wt. nonaromatic softener for rubber, (D) a polyphenylene ether resin comprising a bond unit shown by the formula (R1-R4 are H, halogen or hydrocarbon group), having 0.15-0.7 reduced viscosity in a ratio of the component A/D=90/10-30/70(weight ratio) and, if necessary, (E) 5-100pts.wt. polyolefin resin.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a highly elastic hydrogenated material that is highly flexible and can be used as a material for various molded products having excellent high-temperature compression set, mechanical strength, and moldability. The present invention relates to a block copolymer composition.

(Prior art) In recent years, thermoplastic nystomers, which are rubber-like soft materials that require a vulcanization process and have moldability similar to thermoplastic resins, have been used for automobile parts, home appliances, electric wire coatings, and medical applications. It is useful in the fields of parts, miscellaneous goods, footwear, etc. Among such thermoplastic elastomers, there are some elastomeric compositions using hydrogenated derivatives of vinyl aromatic compound-conjugated diene compound block copolymers (hereinafter abbreviated as hydrogenated block copolymers). proposals have been made. For example, JP-A-50-14742, JP-A-52
No. 65551 and JP-A No. 58-206644 disclose an elastomeric composition in which a hydrogenated block copolymer is blended with a hydrocarbon oil and an olefin polymer.
Furthermore, JP-A-59-6236 and JP-A-59-16
No. 1613 discloses an elastomeric composition obtained by blending a hydrogenated block copolymer with a hydrocarbon oil, an olefin polymer, and an inorganic filler, and partially crosslinking it in the presence of an organic peroxide and a crosslinking aid. Proposals have been made to improve the rubber elasticity (compression set) of elastomeric compositions at high temperatures.

Furthermore, in JP-A-54-889<S[], JP-A-59-100159, and JP-A-57-56941, hydrogenated block copolymers and polyphenylene ether are essential components, polyolefin resins, Compositions of hydrogenated block copolymers comprising polystyrene resins are disclosed. However, these proposals are aimed at modifying resin compositions, and the resulting compositions are thermoplastic resins.

The thermoplastic elastomer described above did not have the rubber elasticity of an elastomeric composition.

(Problems to be Solved by the Invention) Although the elastomeric composition of the hydrogenated block copolymer obtained by the above-mentioned prior art proposal has excellent rubber elasticity (compression set) at 70°C, Its elasticity is poor at over 70%, and it does not reach the level of compression set at high temperatures that is conventionally required for vulcanized rubber applications.
Although it has ease of molding, the rubber elasticity at high temperatures is currently still in the insufficient range, and this has been taken for granted.

(Means for Solving the Problems) The present invention was made to solve the problems that were difficult to solve with the above-mentioned conventional elastomer molding materials.
In particular, it was created based on the need for a molding material that can satisfy the previously unattainable properties of processability as a thermoplastic elastomer, recyclability, and rubber elasticity at high temperatures (compression set at 10D'O). The present inventors have discovered that this desire can be satisfactorily achieved by a specific elastomeric composition, and have further discovered that the composition is a practically useful composition.

That is, the present invention provides a block copolymer comprising (1) (al) a polymer block A mainly composed of at least two vinyl aromatic compounds and a polymer block B mainly composed of at least one conjugated diene compound; Hydrogenated block copolymer a obtained by hydrogenating the copolymer 10D7a parts (1) l Polystyrene resin 5 to 100 parts by weight t weight Softener for non-aromatic DEM 10 to 3001 parts (here, R1, R2, R3, and R4 are each
(selected from the group consisting of hydrogen, halogen, and hydrocarbon groups) and has a reduced viscosity (0.5 N/dt chloroform solution, measured at 60°C) in the range of 0.15 to 0.70. Polyphenylene ether resin d, which is a polymer and/or copolymer, has a/eL
= 90/10 to 30/70 (weight ratio) Highly elastic hydrogenated block copolymer composition fdl
s (dl and tel polyolefin resin
A high modulus hydrogenated block copolymer composition comprising 5 to 100 parts by weight is provided.

The present invention will be described in detail below.

The hydrogenated block copolymer used as the fal component in the present invention consists of a polymer block A mainly composed of at least two vinyl aromatic compounds and a polymer block B mainly composed of at least one conjugated diene compound. It is obtained by hydrogenating a block copolymer consisting of, for example, A-B-A% B-A-B-A, (A-B gas S1, A
It is a hydrogenated vinyl aromatic compound-conjugated diene compound block copolymer having a structure such as -B-A-B-A. This hydrogenated block copolymer contains 5 to 60% by weight of a vinyl aromatic compound, preferably 10 to 50% by weight.
In addition, referring to the block structure, the polymer block A mainly composed of a vinyl aromatic compound is a vinyl aromatic compound polymer block or a vinyl aromatic compound containing more than 50% by weight, preferably 70% by weight or more. It has a structure of a copolymer block of a vinyl aromatic compound and a hydrogenated conjugated diene compound, and furthermore, a polymer block B mainly composed of a hydrogenated conjugated diene compound, A hydrogenated conjugated diene compound polymer block, or a copolymer of a hydrogenated conjugated diene compound and a vinyl aromatic compound containing more than 50% by weight and preferably 70% by weight or more of a hydrogenated conjugated diene compound. It has a block structure.

In addition, polymer block A mainly composed of these vinyl aromatic compounds and polymer block B mainly composed of hydrogenated conjugated diene compounds contain hydrogenated conjugated diene in the molecular chain of each polymer block. The distribution of compounds or vinyl aromatic compounds is random, tapered r (
The monomer component may increase or decrease along the molecular chain), partially block-like, or any combination thereof; When there are two or more polymer blocks each containing a conjugated diene compound as a main component, each polymer block may have the same structure (or may have different structures).

As the vinyl aromatic compound constituting the hydrogenated block copolymer, one or more types can be selected from, for example, styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene, etc. Among them, styrene is preferable.

Further, as the conjugated diene compound before hydrogenation constituting the hydrogenated conjugated diene compound, for example, one or two types from butadiene, imprene, 1,3-pentadiene, 2,6-cymethylto-3-butadiene, etc. The above are selected, among which butadiene, isoprene and combinations thereof are preferred. The microstructure of a polymer block mainly composed of a conjugated diene compound before being hydrogenated can be arbitrarily selected; for example, in a polybutadiene block, the 1,2-microstructure is
0 to 50 inches, preferably 25 to 45 inches.

Further, the number average molecular weight of the hydrogenated block copolymer used in the present invention having the above structure is 5,000 to LOOO,0.
00, preferably i o, o o o ~ 800.000
, more preferably in the range of 30,000 to 500.000, and the ratio (W/un) of molecular weight distribution [weight average molecular weight CMW) to number average molecular weight (Mn): l is 10
It is as follows. Further, the molecular structure of the hydrogenated block copolymer may be linear, 12-branched, radial, or any combination thereof.

These block copolymers may be produced by any method as long as they have the structure described above. For example,
According to the method described in Japanese Patent No. 3798, a vinyl aromatic compound-conjugated diene compound block copolymer is synthesized in an inert solvent using a lithium-muth catalyst, etc. Publication No. 704, Special Publication No. 43-66
The hydrogenated Zoloku copolymer used in the present invention is synthesized by adding hydrogen in an inert solvent in the presence of a hydrogenation catalyst by the method described in JP-A-66 or JP-A-59-133203. can do.

At that time, at least 80 atoms of the aliphatic double bonds based on the conjugated diene compound of the vinyl aromatic compound-conjugated diene compound block copolymer are hydrogenated, and the polymer block mainly composed of the conjugated diene compound is transformed into an olefin. The compound can be converted into a polymer block. In addition, aromatic and group double bond hydrogens based on vinyl aromatic compounds copolymerized in polymer block A, which is entirely composed of vinyl aromatic compounds, and, if necessary, polymer block B, which is composed mainly of conjugated diene compounds. Although there is no particular restriction on the addition rate, it is preferable that the hydrogenation rate is 20% or less. The amount of unhydrogenated aliphatic double bonds contained in the hydrogenated block copolymer can be easily determined using an infrared spectrophotometer, nuclear magnetic resonance apparatus, or the like.

Next, the polystyrene resin used as the fl)l component of the present invention is an essential component for improving the processability of the resulting composition, and is preferably obtained by a known radical polymerization method or ionic polymerization method. The number average molecular weight is 5,000 to 50 [ ], [300, preferably 1
It can be selected from the range of 0,000 to 200,000, and the molecular weight distribution [weight average molecular weight (ηW) and number average molecular weight (n)
(Mw/n)) is preferably 5 or less.

The amount of component +1)l can be suitably selected within the range of 5 to 100 parts by weight per 100 parts by weight of component (a). If the amount exceeds 100 parts by weight, the resulting elastomeric composition will have too much hardness and will lose its flexibility.
Not only is it impossible to obtain a product with a rubbery feel, but the rubber elasticity (compression set) at high temperatures is extremely poor, which is undesirable.
Furthermore, if the amount is less than 5 parts by weight, the processability will not be improved, which is not preferable.

The rubber softener used as the tel component in the present invention is:
It is an essential component for making the resulting composition into a flexible rubber-like composition, and non-aromatic mineral oil or liquid or low molecular weight synthetic softeners are suitable. Among these, mineral oil-based oils, commonly called process oils or extender oils, are used to soften, increase volume, and improve processability of rubber.
Softeners for gums are a mixture of aromatic rings, naphthenic rings, and paraffin chains, and those in which the number of carbon atoms in the paraffin chains accounts for 50% or more of the total carbon are called paraffinic softeners. Mineral oil-based rubber softeners used as component IQ) of the present invention are naphthenic when the carbon number is 60 to 45, and aromatic when the aromatic carbon number is more than 30%. Among the above categories, naphthenic and paraffinic ones are preferred, and aromatic ones with an aromatic carbon number of 60% or more are unfavorable in terms of dispersibility and solubility in the composition with the above component (al). The properties of these non-aromatic rubber softeners are 67.8°C.
The kinematic viscosity is 20 to 500cst, the pour point is -10
~-15°C and a flash point of 170-300°C.

As the synthetic softener, polydetene, low molecular weight polybutadiene, etc. can be used, but the above-mentioned mineral oil-based softeners for rubber give better results.

The blending amount of the softener in component CL is 10 to 30,031 parts, preferably 1 to 30,031 parts per 100 parts by weight of component AL.
This is the department in charge of 0-25 ON. If the amount exceeds 3002 parts, the softener tends to bleed out, and the final product may become sticky, and the mechanical properties will also deteriorate and become slippery. If the amount is less than 1o, the resulting composition becomes close to a resin composition, increases in hardness, loses flexibility, and is also unfavorable from the economic point of view.

Next, the polyphenylene ether resin used as component T (11) of the present invention is an essential component for improving the a: compression set of the resulting composition, (here, R1, R
2, R3 and R4 are each selected from the group consisting of hydrogen halogen and hydrocarbon group, and are homopolymers and/or copolymers consisting of 0.2, R3 and R4, which may be the same or different from each other; The reduced viscosity measured at 30°C in a 5 g/dt chloroform solution is in the range of 0.15 to 0.70, more preferably 0.20 to 0.
．． A range of 60 is used. As this polyphenylene ether resin, a known one can be used for '''C. Specific examples include poly 2,6-dimethyl-1,4-phenylene ether, 2-methyl-6ethyl-1,4-phenylene ether, 2,61' phenyl to 1,4-phenylene ether, 2-methyl-6-phenylate 4-phenylene ether, 2,6-cyclo-1,4-phenylene ether, etc., and 2,6-dimethyl Polyphenylene ether copolymers such as copolymers of phenol and other phenols (such as 2,3,6-dimethylphenol and 2-methyl-6-butylphenol) may also be mentioned. Among them, poly(2,6- Cymethyl-1・4
-phenylene) ether, a copolymer of 2,6-dimethylphenol and 2,6,6-drimethylphenol is preferred, and poly(2,6-dimethyl-1,4-phenylene) ether is more preferred.

In the case of poly(2,6-dimethyl-1,4-phenylene ether), its reduced viscosity (0,59/dl-.

Chloroform solution, measured at 60°C): a, 15-0.
A range of 70 is preferable, more preferably 0.60.
~0.60.

The blending amount of the component dl can be suitably selected in the range of 90/1 [1 to 30/70]. If the weight ratio is less than 30/70, the hardness of the resulting elastomeric composition will be too high, resulting in a loss of flexibility and a resinous composition, making it impossible to obtain a product with a rubbery feel. , the rubber elasticity [compression set (100°C x 22 hours)] at high temperatures is poor, which is undesirable.In addition, in formulations where the weight ratio value exceeds 90/10, the effect of adding polyphenylene ether is Rubber elasticity (
No improvement in compression set (compression set) was observed, which is unfavorable.

Next, the polyolefin resin used as the (θ) component of the present invention is effective in improving the processability and/or heat resistance of the resulting composition, such as polyethylene, isotactic polypropylene, propylene and other small amounts. copolymers of α-olefins, such as propylene-ethylene copolymer, propylene-1-hexene copolymer, gloscin-4-methyl-1-pentene copolymer, and poly4-methyl-1-pentene, Examples include polybutene-1. When using isotactic polypropylene or its copolymer as the polyolefin resin, MFR (ASTM-D-1238-L conditions, 23
0'C) is 0.1 to 50.9/10 minutes,
5 to 30 g/11] minutes can be suitably used.

The blending amount of component +81 is 5 to 100 parts by weight, preferably 10 to 70 parts by weight, per 100 parts by weight of the component (at).If the blending amount exceeds 100 parts by weight, the hardness of the resulting elastomeric composition Not only does it become too high and the flexibility is lost, making it impossible to obtain a product with a rubbery feel, but
Rubber elasticity (compression set) at high temperatures is extremely deteriorated, which is undesirable (.In addition, when less than 5 parts by weight is added, the polyolefin resin exhibits processability equivalent to that of the composition of the present invention without being added. do.

In addition to the above-mentioned lal to (el) components, the composition of the present invention may further contain an inorganic filler (8) as required. Not only does it have the benefit of measuring, but it also has the advantage of adding a cumulative effect to quality improvement (compression set, etc.).Inorganic fillers include, for example, calcium carbonate, carbon black, talc, clay, and magnesium hydroxide. , mica, synthetic barium, natural silicic acid, synthetic silicic acid (white carbon), titanium oxide, etc. Channel black, furnace black, etc. can be used for carbon filling. Among these inorganic fillers, talc, carbonic acid Calcium and furnace black are economically advantageous and preferable.Also, it is possible to add a conductive filler to impart conductivity; for example, conductive carbon such as Ketjenblack may be used. .

The amount of the inorganic filler to be blended can be suitably selected within the range of 1 to 600 parts by weight based on 100 parts by weight of the hydrogenated block copolymer of component al.

The highly elastic elastomeric composition of the present invention can be obtained by combining the above-mentioned components. 1 Flame retardant, L fiber, capo.

Fibers, antioxidants, heat stabilizers, ultraviolet absorbers, hindered amine light stabilizers, and colorants can be added.

As a method for compounding the highly elastic elastomeric composition of the present invention, methods used in the production of ordinary resin compositions or rubber compositions can be adopted, such as a single screw extruder, a twin screw extruder, a Banbury mixer, etc. 5. Composite composition can be performed using a melting mixer such as a heating roll, a Brabender, or various kneaders.

At this time, there is no restriction on the order in which each component is added; for example, all the components may be premixed using a mixer such as a Henschel mixer or Brengu, and then melted and compounded using the above kneading machine, or any components may be premixed and used as a masterbatch. The O addition method is adopted, such as melting and compounding, and then adding the remaining components to melt and compound.
can.

The composite composition of the present invention can be molded using a commonly used thermoplastic resin molding machine, and various molding methods such as injection molding, extrusion molding, blow molding, and calendar molding can be applied. It is possible.

(Effects of the Invention) The composition obtained by the present invention has excellent flexibility, heat resistance, mechanical strength, and rubber elasticity at high temperatures, and has excellent moldability and
Because of its excellent paintability and electrical insulation properties, it can be used in various electrical wire coatings (using its high rubber elasticity).
It can be suitably molded and used for insulation, sheaths), home appliance parts, automobile parts, and various industrial parts. Specific applications include various gaskets, flexible tubes, hose coverings, sea urchin strips, flexible bumpers, side bumpers, moldings, filler panels, lamp housings, wire cable coverings, air intake hoses, cushion panels, etc. @ (Examples) The present invention will be explained in more detail by Examples, but the present invention is not limited to these Examples.

In addition, in these Examples and Comparative Examples, the test methods used for various evaluations are as follows.

(1) Hardness [-] JIS-K-6301, A type (2) Tensile strength Ckll/crIL] and tensile elongation [chi] JIS-K-6301, using a 2-thickness injection sheet as the sample, and testing. The piece is size 6.

(3) Compression set [chi] JIS-6301, 25% deformation at 70°C and 100°C for 22 hours.

In addition, the ingredients blended are as follows.

(1) <Component (a-1)> Has a hydrogenated polybutadiene-polystyrene-hydrogenated polydetadiene-boristyrene structure,
Bound styrene content 36%, number average molecular weight 128,000,
Molecular weight distribution 1.04, 1.2 of polybutadiene before hydrogenation
A hydrogenated block copolymer with a bond amount of 62% and a hydrogenation rate of 99% was synthesized using a T1 hydrogenation catalyst described in JP-A-59-133203, and was used as component (a-1). .

Component (a-2)> Polystyrene-hydrogenated polybutadiene-polystyrene structure, bound styrene 28%, number average molecular weight 194.00, D% molecular weight distribution 1.08, 1% of polybutadiene before hydrogenation・2 bonds are 27, hydrogenation rate is 99%
The hydrogenated block copolymer was synthesized using a hydrogenation catalyst described in JP-A-59-133203, and was used as component (a-2).

<Component (a-3)> has a hydrogenated polybutadiene-polystyrene-hydrogenated polydetagene-boristyrene structure,
A hydrogenated Zoloku copolymer with a bound styrene content of 22%, a number average molecular weight of 81,000, a molecular weight distribution of 1.03, a 1/2 bond content of polybutadiene before hydrogenation of 66%, and a hydrogenation rate of 99% was produced in JP-A-Sho. Component (a-3) was synthesized using a Ti-based hydrogenation catalyst described in Japanese Patent No. 59-133203.

Component (a-4)> (Polystyrene-hydrogenated polybutadiene-S)
A hydrogenated block having the structure i, a bound styrene content of 60%, a number average molecular weight of 393,000, a molecular weight distribution of 1.58, a 1,2 bond concentration of polybutadiene before hydrogenation of 60%, and a hydrogenation rate of 99%. A copolymer was synthesized using a Ti-based hydrogenation catalyst described in JP-A-59-133203, and the component (a-
4).

Component (a-5)> Shell Chemical KRATON-G 1651 Component (a-6)> Shell Chemical KRATON-01650 (2)
Ingredients (bl Asahi Kasei Co., Ltd. Rip Styron 685 (number average molecular weight 78.00
0) (3) Component (c) Diana process oil PW-380 manufactured by Idemitsu Kosan [paraffinic, kinematic viscosity s 381.6 cst (40°C
), 30. i cst (100°C), average molecular weight 74
6. Ring analysis; CN-27%, CP = 73%] (4)
<Component ((L-1)> As polyphenylene ether resin, reduced viscosity of poly(2°6-dimethyl-1,4-phenylene) ether;
0.37.0.68> was synthesized and used as component (d-1).

<Component (d-2)> % 2,6-dimethylphenol/2,3,6- from 2,6-dimethylphenol containing 5% of 2,6,6-dimethylphenol as a polyphenylene ether resin
Dolimethylphenol copolymer (reduced viscosity 0.53)
was synthesized and used as component (d-2).

(5) Component (θ1 Polypropylene resin manufactured by Asahi Kasei Co., Ltd., M-1300CMPR
(230°C) 4 g/10 minutes] Examples 1 to 5 As hydrogenated block copolymers, components (a-1), (a-
2), (a-4), and (a-5), and using component (a-1) with a reduced viscosity of 0.37 as polyphenylene ether, the components shown in Table 1 were mixed in a Henschel mixer, and 3 (Melting and kneading was carried out in a twin-screw extruder with a diameter of lll+m at a temperature of 26 mm to obtain a smooth elastomeric pellet with a good surface texture. Using this pellet, an injection molded product was evaluated, and the results are shown in Table 1. I posted it.

From these results, it is clear that the composition of the present invention has a compression set of 50% or less at 100°C and is excellent in rubber elasticity at high temperatures. Furthermore, the surface texture of the injection molded products of these compositions was excellent in gloss and no stickiness was observed.

Comparative Examples 1 to 4 Hydrogenated block copolymers (a-1), (a-2),
Using (a-5) and component (a-1) with a reduced viscosity of 0.37 as polyphenylene ether, each component shown in Table 2 was composited in the same manner as in Examples 1 to 5, and further molded. It was evaluated. The results are listed in Table 2.

These results revealed that compositions outside the scope of the present invention had excellent compression set at 70°C, but had extremely poor compression set at 100°C and were inferior in rubber elasticity at high temperatures. .

(Leaving space below) Examples 6 to 9 Comparative Examples 5 and 6 Using (a-3) and (a-6) as hydrogenated block copolymers, and using component (d-2) as polyphenylene ether, Table 3 The components shown in the following were composited in the same manner as in Examples 1 to 5, and then injection molded and evaluated. The results are listed in Table 6.

From this result, it is recognized that the compression set of the composition of the present invention is improved even when a polyphenylene ether copolymer is used. Moreover, although Comparative Example 5.6, which is outside the scope of the present invention, has deteriorated compression set at 70°C, Examples 6 to 9, which are compositions of the present invention, have deteriorated compression set at 70°C. The composition has greatly improved distortion and compression set at 100°C, and has excellent rubber elasticity at high temperatures.

(Extra margin) Example 10 Polyphenylene ether with a reduced viscosity of 68 (d-
1) Except for using the ingredients, the same composition as in Example 1 was blended, melt-kneaded under the same conditions, and further injection molded to obtain a test piece. Physical property evaluation revealed that the hydrogenated block copolymer had excellent elasticity, with hardness of 55, tensile strength of 100 kg/F2, elongation of 710%, 70°C compression set of 26 cm, and 100°C compression set of 65%. Obtained.

When the tensile strength of this test piece was further measured at 70°C, it was 66 kg/α2, indicating excellent heat resistance.

Special applicant Asahi Kasei Kogyo Co., Ltd. Procedural amendment type (voluntary) February 6, 1985 Director General of the Patent Office Michibe Uga 1, Indication of case Patent application No. 18742 of 1985
5 No. 2, Name of the invention 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka (003)
Makoto Seiko, President and Representative Director of Asahi Kasei Industries, Ltd.

, / This / 4 "Detailed Description of the Invention" column 5 of the specification to be amended Contents of the amendment 1. Add the following sentence next to line 12 on page 31 of the specification.

"Example 11 Polystyrene-poly(styrene/butadiene: 10/9
0% by weight)-poly(styrene/butadiene=10790
weight%) - poly(styrene/butadiene = 10/90 weight 1-polystyrene), and the poly(styrene/butadiene = 10/90 weight %)
Fully bonded styrene with 223 tapered bronzes in which styrene gradually increases in the portion (butadiene = 10790% by weight) [3
7%, block styrene amount 30%.

Number average molecular weight 171,000, molecular weight distribution 1.08.1
．． A block copolymer with a 2-bond content of 38% was used as a base, and a hydrogenation reaction was further performed using a Ti-based hydrogenation catalyst described in JP-A-59-133203 to obtain a hydrogenated block with a hydrogenation rate of 99%. A copolymer was obtained.

Except for using this hydrogenated block copolymer, the same composition as in Example 1 was used, and the same mixed wire and injection molding were performed and evaluated. Hardness: 60, tensile strength: 78 Kf/lfl, elongation: 580%, compression Permanent deformation (100℃X22HR8)42
A composition having the following properties was obtained. "that's all

Claims (2)

[Claims] (1) (a) Hydrogenating a block copolymer consisting of a polymer block A mainly composed of at least two vinyl aromatic compounds and a polymer block B mainly composed of at least one conjugated diene compound. Hydrogenated block copolymer a obtained by 100 parts by weight (b) Polystyrene resin 5 to
100 parts by weight (c) Softener for non-aromatic rubber 10-3
00 parts by weight (d) Bonding units ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (Here, R_1, R_2, R_3, and R_4 are each selected from the group consisting of hydrogen, halogen, and hydrocarbon group) ), reduced viscosity (0.5g/
dl chloroform solution, measured at 30°C) is 0.15 to 0.
Polyphenylene ether resin d, which is a homopolymer and/or copolymer in the range of 70, has a/
Highly elastic hydrogenated block copolymer composition consisting of d=90/10 to 30/70 (weight ratio) (2) (a) Hydrogenating a block copolymer consisting of a polymer block A mainly composed of at least two vinyl aromatic compounds and a polymer block B mainly composed of at least one conjugated diene compound. Hydrogenated block copolymer a obtained by 100 parts by weight (b) Polystyrene resin 5 to
100 parts by weight (c) Softener for non-aromatic rubber 10-3
00 parts by weight (d) Bonding unit ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (Here, R_1, R_2, R_3 and R_4 are each selected from the group consisting of hydrogen, halogen, and hydrocarbon group) It consists of reduced viscosity (0.5g/d
l chloroform solution, measured at 30°C) is 0.15 to 0.7
Polyphenylene ether resin d, which is a homopolymer and/or copolymer, is in the range of 0 to a/d
=90/10 to 30/70 (weight ratio) (e) Highly elastic hydrogenated block copolymer composition comprising 5 to 100 parts by weight of polyolefin resin