JP2000038494A - Tube material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tube material excellent in thermal stability, mechanical strengths, tear strength, resistance to gas permeation resistance to vapor permeation or the like by using a specific block copolymer. SOLUTION: This tube material comprises an isobutylene-based block copolymer composed of (A) a polymer block consisting essentially of isobutylene, and (B) a polymer block composed of a monomer component (preferably consisting essentially of an aromatic vinyl monomer, especially styrene or the like) not consisting essentially of the isobutylene. The isobutylene-based block copolymer is preferably composed of 5-80 wt.% monomer of the component B and 95-20 wt.% component A, and preferably has 30,000-500,000 number average molecular weight. As a result, the tube material excellent in various characteristics, capable of being used in a wide temperature range, and facilitating the recycle thereof can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water vapor permeation resistance,
The present invention relates to a tube material which is excellent in various properties such as gas permeation resistance and heat resistance, can be used in a wide temperature range, and is easy to recycle.

[0002]

2. Description of the Related Art In recent years, various tube materials have been developed in the fields of automobiles, medical and pharmaceutical fields, and food fields. Such tube materials include, for example, mechanical strength, heat resistance,
Physical properties such as weather resistance, chemical resistance, water vapor transmission resistance, and gas transmission resistance are required, and excellent flexibility and workability are required. Heretofore, as tube materials, vinyl chloride-based materials, silicon-based materials, and the like have been known, but all of these materials have some disadvantages and are not always satisfactory. For example, a vinyl chloride tube has a problem that the plasticizer bleeds and a problem that its durability is low. Silicone tubes have excellent performance such as durability and chemical resistance,
There were problems that the mechanical strength (particularly the tear strength) was low and the price was high. Recently, a tube material composed of a styrene block copolymer represented by a styrene-ethylenebutylene-styrene copolymer or a styrene-isoprene-styrene copolymer has been developed. These are excellent in mechanical strength, flexibility and recyclability, but have a problem that weather resistance and heat stability are low. There is also a problem that the water vapor transmission resistance and the gas transmission resistance are not sufficient. Against this background, there is a need for the development of new tube materials, especially in the automotive field, civil engineering and construction fields, where the tube material may be exposed to vibration, and therefore has excellent wear resistance. The development of tube materials is desired. In addition, in the fields of medicine, medical treatment, and food, development of a tube material having excellent moisture barrier properties and gas barrier properties has been demanded from the viewpoint of preservation of medicines and foods.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide a heat resistant stability, a mechanical strength, a tear strength, a gas permeation resistance and a water vapor permeation resistance which are higher than those of conventional styrene block copolymers. An object of the present invention is to provide a tube material having excellent heat resistance, wear resistance and flexibility.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, a tube material made of a specific block copolymer can overcome the above-mentioned problems. The present invention has been found to be excellent in various properties such as water vapor permeability, gas permeability resistance, heat resistance, tear strength, abrasion resistance, flexibility, etc., can be used in a wide temperature range, and is easy to recycle. Was completed. That is, the present invention provides a tube material comprising an isobutylene-based block copolymer formed from a polymer block containing isobutylene as a main component and a polymer block containing a monomer component not containing isobutylene as a main component. is there.

[0005] The isobutylene-based block copolymer comprises:
A polymer block composed of a monomer component containing no isobutylene as a main component-a polymer block composed mainly of isobutylene-a triblock body having a structure of a polymer block composed of a monomer component containing no isobutylene as a main component, isobutylene A polymer block composed of a monomer component not containing a main component-a diblock having a structure of a polymer block containing isobutylene as a main component, a polymer block consisting of a monomer component containing no isobutylene as a main component and isobutylene. It is preferably a star-shaped block having three or more arms composed of a polymer block as a main component, or a mixture thereof.

[0006] The component ratio in the isobutylene-based block copolymer is 5 to 80% by weight of a monomer not containing isobutylene as a main component and 95 to 20% by weight of a monomer containing isobutylene as a main component. More preferably, the former comprises 15 to 40% by weight and the latter comprises 85 to 60% by weight.

The number average molecular weight of the isobutylene block copolymer is preferably from 30,000 to 500,000, more preferably from 50,000 to 400,000.

The monomer not containing isobutylene as a main component preferably contains an aromatic vinyl monomer as a main component.
Styrene is common, but for applications requiring heat resistance, α-methylstyrene, p-methylstyrene,
It preferably contains at least one selected from the group consisting of vinylnaphthalene derivatives and indene derivatives.

[0009] As an example of the above, it can also consist of α-methylstyrene and / or a mixture of indene and styrene.

[0010] The tube material may further contain a filler, and if necessary, at least one selected from the group consisting of a polyolefin-based resin, a process oil, a filler and a stabilizer.

The tube material can be suitably used as any of tube materials for automobile parts, tube materials for medicines and medical care, tube materials for food, and tube materials for civil engineering and construction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The present invention relates to a tube material comprising an isobutylene-based block copolymer formed from a polymer block containing isobutylene as a main component and a polymer block containing a monomer component not containing isobutylene as a main component.

The isobutylene-based block copolymer of the present invention is not particularly limited as long as it has a polymer block containing isobutylene as a main component and a polymer block containing a monomer component not containing isobutylene as a main component. However, for example, any of block copolymers, diblock copolymers, triblock copolymers, and multiblock copolymers having a linear, branched, or star-like structure can be selected. As a preferable block copolymer, from the viewpoint of physical properties balance, a polymer block composed of a monomer component not containing isobutylene as a main component-a polymer block containing isobutylene as a main component-a monomer block containing no isobutylene as a main component Triblock copolymer consisting of a polymer block consisting of, a polymer block consisting of a monomer component not containing isobutylene as a main component-diblock copolymer consisting of a polymer block containing isobutylene as a main component, isobutylene as a main component And a star block copolymer having three or more arms composed of a polymer block composed of a monomer component not containing and a polymer block composed mainly of isobutylene. These can be used alone or in combination of two or more in order to obtain desired physical properties and moldability.

The monomer component not containing isobutylene as a main component of the present invention means a monomer component having an isobutylene content of 30% by weight or less. The content of isobutylene in the monomer component containing no isobutylene as a main component is preferably 10% by weight or less, more preferably 3% by weight or less.

The monomer other than isobutylene in the monomer component containing no isobutylene as a main component of the present invention is not particularly limited as long as it is a cationically polymerizable monomer component. Monomers such as vinyls, dienes, vinyl ethers, silanes, vinyl carbazole, β-pinene, acenaphthylene and the like can be exemplified. These are used alone or in combination of two or more.

Examples of the aliphatic olefin monomer include ethylene, propylene, 1-butene, 2-methyl-1-butene, 3-methyl-1-butene, pentene, hexene, cyclohexene, and 4-methyl-1-pentene. , Vinylcyclohexane, octene, norbornene and the like.

The aromatic vinyl monomers include styrene, o-, m- or p-methylstyrene, α-methylstyrene, β-methylstyrene, 2,6-dimethylstyrene, 2,4-dimethylstyrene, α-methyl-o-methylstyrene, α-methyl-m-methylstyrene, α-methyl-p-methylstyrene, β-methyl-o-methylstyrene, β-methyl-m-methylstyrene, β-methyl-p -Methylstyrene, 2,4,6-trimethylstyrene, α-methyl-2,6-dimethylstyrene, α-methyl-2,4-dimethylstyrene, β-methyl-2,6-
Dimethylstyrene, β-methyl-2,4-dimethylstyrene, o-, m- or p-chlorostyrene, 2,6-dichlorostyrene, 2,4-dichlorostyrene, α-chloro-o-chlorostyrene, α- Chloro-m-chlorostyrene, α-chloro-p-chlorostyrene, β-chloro-
o-chlorostyrene, β-chloro-m-chlorostyrene, β-chloro-p-chlorostyrene, 2,4,6-trichlorostyrene, α-chloro-2,6-dichlorostyrene, α-chloro-2,4 -Dichlorostyrene, β-chloro-2,6-dichlorostyrene, β-chloro-2,4
-Dichlorostyrene, o-, m- or pt-butylstyrene, o-, m- or p-methoxystyrene, o-,
m- or p-chloromethylstyrene, o-, m- or p
-Bromomethylstyrene, a styrene derivative substituted with a silyl group, indene, vinylnaphthalene and the like.

Examples of the diene monomer include butadiene, isoprene, hexadiene, cyclopentadiene, cyclohexadiene, dicyclopentadiene, divinylbenzene and ethylidene norbornene.

The vinyl ether monomers include methyl vinyl ether, ethyl vinyl ether, (n-, iso) propyl vinyl ether, (n-, sec-, te
rt-, iso) butyl vinyl ether, methylpropenyl ether, ethylpropenyl ether and the like.

Examples of the silane compound include vinyltrichlorosilane, vinylmethyldichlorosilane, vinyldimethylchlorosilane, vinyldimethylmethoxysilane, vinyltrimethylsilane, divinyldichlorosilane, divinyldimethoxysilane, divinyldimethylsilane, 1,3-
Examples thereof include divinyl-1,1,3,3-tetramethyldisiloxane, trivinylmethylsilane, γ-methacryloyloxypropyltrimethoxysilane, and γ-methacryloyloxypropylmethyldimethoxysilane.
The monomer component not containing isobutylene as a main component of the present invention,
From the balance of physical properties and polymerization characteristics, it is preferable that the monomer component is mainly composed of an aromatic vinyl monomer.
Further, styrene, α-
1 selected from the group consisting of methylstyrene, p-methylstyrene, vinylnaphthalene derivatives and indene derivatives
It is preferable to use at least one kind of monomer, and it is particularly preferable to use styrene, α-methylstyrene, indene, or a mixture thereof in terms of cost.

The monomer component of the present invention containing isobutylene as a main component may or may not contain a monomer other than isobutylene. The monomer other than isobutylene is not particularly limited as long as it is a monomer capable of cationic polymerization, and examples thereof include the above-mentioned monomers.

The ratio of the polymer block containing isobutylene as a main component and the polymer block containing a monomer component not containing isobutylene as a main component is not particularly limited.
From the viewpoint of various physical properties, it is preferable that the polymer block composed of a monomer component not containing isobutylene as a main component is 5 to 80% by weight, and the polymer block containing isobutylene as a main component is 95 to 20% by weight. 15 to 40% by weight of a polymer block composed of a monomer component containing no isomer as a main component, and 8% of a polymer block containing isobutylene as a main component.
Particularly preferred is 5 to 60% by weight.

The number average molecular weight of the isobutylene block copolymer is not particularly limited, but is preferably 30,000 to 500,000, and 50,000 from the viewpoints of fluidity, processability, physical properties and the like. It is particularly preferred that it is ~ 400,000. If the number average molecular weight of the isobutylene-based block copolymer is lower than the above range, the mechanical properties are not sufficiently exhibited, while if it exceeds the above range, it is disadvantageous in terms of fluidity and processability. .

Regarding the method for producing the block copolymer,
Although not particularly limited, for example, it is obtained by polymerizing a monomer containing isobutylene as a main component and a monomer not containing isobutylene as a main component in the presence of a compound represented by the following general formula (I). Be

[0025]

Embedded image

(Wherein, a plurality of R ^{1 s} are the same or different and each represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 6 carbon atoms. R ² is a monovalent or polyvalent aromatic hydrocarbon group. Or 1
Represents a monovalent or polyvalent aliphatic hydrocarbon group. X represents a halogen atom, an alkoxyl group having 1 to 6 carbon atoms, or an acyloxyl group having 1 to 6 carbon atoms. n represents an integer of 1 to 6. When a plurality of Xs are present, they may be the same or different. As specific examples of the compound represented by the general formula (I),
(1-chloro-1-methylethyl) benzene, 1,4-
Bis (1-chloro-1-methylethyl) benzene, 1,
3-bis (1-chloro-1-methylethyl) benzene,
1,3,5-tris (1-chloro-1-methylethyl)
Benzene and 1,3-bis (1-chloro-1-methylethyl) -5- (tert-butyl) benzene are exemplified. Bis (1-chloro-1-methylethyl) benzene is also called bis (α-chloroisopropyl) benzene, bis (2-chloro-2-propyl) benzene, or dicumyl chloride.

Among them, in terms of reactivity and availability,
Bis (1-chloro-1-methylethyl) benzene is particularly preferred.

In the present invention, first, a monomer having isobutylene as a main component is polymerized in the presence of the compound represented by the general formula (I), and an isobutylene having a substituent (X) at a terminal is obtained. After synthesizing a system polymer, isolating and purifying it, polymerizing a monomer not containing isobutylene as a main component,
A block copolymer can also be synthesized.

Further, if necessary, a Lewis acid catalyst may coexist. Such a Lewis acid may be any as long as it can be used for cationic polymerization, and TiCl ₄ , T
iBr ₄ , BCl ₃ , BF ₃ , BF ₃ .OEt ₂ , SnCl ₄ , Sb
Cl ₅ , SbF ₅ , WCl ₆ , TaCl ₅ , VCl ₅ , FeCl ₃ ,
Metal halides such as ZnBr ₂ , AlCl ₃ and AlBr ₃ ; and organic metal halides such as Et ₂ AlCl and EtAlCl ₂ can be suitably used. Above all, considering the ability as a catalyst and the industrial availability, TiC
I ₄ , BCl ₃ , and SnCl ₄ are preferred. In the present invention, the Lewis acid is usually used in a range of 0.1 to 100 times by mole to the compound represented by the above general formula (I), and a preferable use amount is 0.3 to 50 times by mole. Range.

Further, if necessary, an electron donor component may be present. In the present invention, the electron donor component has a donor number of 15 to 60. Conventionally known ones can be widely used. Preferred electron donor components include, for example, pyridines, amines, amides, sulfoxides, and metal compounds having an oxygen atom bonded to a metal atom.

Further, the reaction can be carried out in a solvent, if necessary. Such a solvent is not particularly limited as long as it does not substantially inhibit cationic polymerization, and any solvent can be used. Specifically, halogenated hydrocarbons such as methyl chloride, dichloromethane, n-propyl chloride, n-butyl chloride, and chlorobenzene; alkylbenzenes such as benzene, toluene, xylene, ethylbenzene, propylbenzene, and butylbenzene; ethane, propane, Linear aliphatic hydrocarbons such as butane, pentane, hexane, heptane, octane, nonane, and decane; 2-methylpropane, 2-methylbutane,
Branched aliphatic hydrocarbons such as 3,3-trimethylpentane and 2,2,5-trimethylhexane; cycloaliphatic hydrocarbons such as cyclohexane, methylcyclohexane and ethylcyclohexane; petroleum fractions were hydrogenated and refined Paraffin oil and the like can be mentioned.

These solvents may be used alone or in combination of two or more in consideration of the balance between the polymerization characteristics of the monomers constituting the block copolymer and the solubility of the resulting polymer.

The amount of each component used can be appropriately designed depending on the characteristics of the target polymer. First, the molecular weight of the obtained polymer can be determined by the molar equivalent relationship between the isobutylene-based monomer and a cationic polymerizable monomer different from isobutylene and the compound represented by the general formula (1).
Usually, the number average molecular weight of the obtained block copolymer is 20,
It is set to be about 000 to 500,000.

In the production method of the present invention, in conducting actual polymerization, each component is mixed under cooling, for example, at a temperature of -100 ° C. or more and less than 0 ° C. In order to balance the energy cost with the stability of the polymerization, a particularly preferred temperature range is -80C to -30C.

When a block copolymer is produced, a Lewis acid, a compound represented by the general formula (I), an electron donor component,
The method and order of addition of the monomer components and the like are not particularly limited, but preferred methods include, for example,
(A) a step of polymerizing a monomer containing isobutylene as a main component in the presence of an initiator system comprising a compound represented by the general formula (I) and a Lewis acid, and an electron donor component; A method comprising a step of adding a monomer not containing isobutylene as a main component to the reaction system and polymerizing the same is exemplified. On this occasion,
After the step (A), the polymer may be once isolated and purified, or the step (B) may be carried out without isolation.

The tube material of the present invention may be composed of the isobutylene-based block copolymer alone,
It may have a multilayer structure in combination with other tube materials.

The tube material of the present invention may contain additives as needed as long as the performance is not impaired.

Examples of the additives include stabilizers such as antioxidants and ultraviolet absorbers, lubricants, plasticizers, dyes, pigments, flame retardants, fillers, reinforcing materials, tackifiers, and other auxiliaries. Can be In particular, various fillers and reinforcing materials can be used for the purpose of improving the performance such as the strength of the tube material.

Examples of fillers and reinforcing materials include glass fiber, carbon black, flake graphite, carbon fiber, calcium sulfate, calcium carbonate, calcium silicate, alumina, silica, titanium oxide, talc, mica and the like. Examples of the stabilizer include antioxidants such as hindered phenols, phosphate esters, and amines, and ultraviolet absorbers such as benzothiazole, benzotriazole, and benzophenone. As a tackifier,
Known materials such as polybutene resin, rosin resin (rosin, rosin ester or hydrogenated rosin), phenol resin, terpene phenol resin, xylene resin, aliphatic petroleum resin, terpene resin, and cumarone resin can be used.
Further, the tube material of the present invention can be used by adding at least one selected from the group consisting of a polyolefin-based resin and, if necessary, a process oil, a filler and a stabilizer. Here, as the polyolefin resin, α-olefin homopolymer, random copolymer,
Block copolymers and their mixtures, or random copolymers of α-olefins and other unsaturated monomers, block copolymers, graft copolymers and the oxidized, halogenated or sulfonated versions of these polymers One or two things
More than one species can be used in combination. Specifically, polyethylene, ethylene-propylene copolymer, ethylene-propylene-non-conjugated diene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate Copolymer, ethylene-vinyl alcohol copolymer, ethylene-ethyl acrylate copolymer, polyethylene resin such as chlorinated polyethylene, polypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer,
Examples thereof include polypropylene resins such as chlorinated polypropylene, polybutene, polyisobutylene, polymethylpentene, and (co) polymers of cyclic olefins. Among these, a polyethylene resin, a polypropylene resin, or a mixture thereof can be preferably used from the viewpoint of cost and balance of physical properties of the thermoplastic resin. As the filler, those described above can be suitably used. The process oil used in the present invention is not particularly limited, but usually, a liquid or liquid material at room temperature is suitably used. Specific examples include process oils for various rubbers or resins, such as mineral oils, vegetable oils, and synthetic oils. Mineral oils include naphthenic and paraffinic process oils, and vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut oil, wood wax, and pine. Examples of the synthetic system include oil and olive oil, and polybutene and low molecular weight polybutadiene. Among these,
A paraffin-based process oil or polybutene is preferably used in terms of compatibility and physical property balance. These can be used in appropriate combination of two or more kinds in order to obtain desired physical properties. The tube material of the present invention can be prepared by a known method. For example, the isobutylene-based block copolymer and various compounding agents can be mixed with a tumbler, a mixer, a blender, or the like, and kneaded with a screw extruder, a roll, or the like.

The tube material obtained in the present invention can be formed by a known method, for example, a method such as injection molding, extrusion molding, compression molding, or calendar molding.

The tube material obtained by the present invention can be used in, but not limited to, the automotive field, the medical / medical field, the food field, and the civil engineering / construction field.

[0042]

The present invention will be described more specifically with reference to the following examples. It should be noted that the present invention is not limited in any way by these embodiments, and can be appropriately changed and implemented without changing the gist thereof. The molecular weight of the block copolymer and the properties of the tube material were measured by the following methods.

(1) Molecular weight GPC system manufactured by Waters (column: Shodex K-804 (polystyrene gel) manufactured by Showa Denko KK, mobile phase: chloroform). The number average molecular weight is expressed in terms of polystyrene.

(2) Heat Stability A test piece was prepared by compression molding, and this test piece was
It was left in a hot air oven set at 20 ° C. After 7 days, the test piece was taken out, and the state of deterioration was visually observed. Heat stability ：: No change Heat stability △: Slight coloration, deformation of test piece is observed Heat stability X: Coloring, deformation is remarkable (3) Mechanical strength JIS No. 3 dumbbell test piece was prepared by compression molding. . According to JIS K6251, a tensile speed of 500 mm /
The breaking strength was measured in sec.

(4) Tear Strength According to JIS K6252, an angle-shaped test piece with no cut was prepared, and the tear strength was measured.

(5) Water Vapor Permeability Coefficient A sample of about 1 mm thickness was prepared by compression molding,
According to SZ 0208, the permeability coefficient of oxygen at 40 ° C. and 90% RH was measured.

(6) Oxygen Permeability Coefficient A sample of about 1 mm thickness was prepared by compression molding,
The permeability coefficient of oxygen at 23 ° C. was measured according to SK 7126.

(7) Abrasion resistance Measured by the Akron abrasion test B method according to JIS: K6264. The tilt angle is 15 degrees, weight 2.57kgf,
The measurement was performed at a rotation speed of 75 rpm.

(8) Hardness The hardness was measured using a type A durometer according to JIS: K6253.

(9) Volume resistivity The volume resistivity of the sample was measured according to JIS: K7194.

[Production Example 1] (Production Example of Isobutylene Block Copolymer) In a 10 L reaction vessel equipped with a stirrer, 2166 m of methylcyclohexane (dried with molecular sieves) was placed.
L, methylene chloride (dried with molecular sieves) 1,634 mL, p-dicumyl chloride 1.756
g was added. After cooling the reaction vessel to −70 ° C., 0.75 mL of α-picoline (2-methylpyridine) and 633 mL of isobutylene were added. 30m titanium tetrachloride
L was added to start polymerization, and the mixture was reacted at -70 ° C for 1.5 hours while stirring the solution. Then, styrene 2 was added to the reaction solution.
After adding 70 mL and continuing the reaction for further 20 minutes, a large amount of methanol was added to stop the reaction. After removing the solvent and the like from the reaction solution, the polymer was dissolved in toluene and washed twice with water. This toluene solution was added to an acetone-methanol mixture to precipitate a polymer, and the obtained polymer was vacuum-dried at 60 ° C. for 24 hours to obtain an isobutylene-based block copolymer (hereinafter abbreviated as SIBS).

GPC analysis of the obtained isobutylene-based block copolymer (SIBS) revealed a number average molecular weight of 102,000 and a molecular weight distribution of 1.15.
The styrene content was 29% by weight.

(Example 1) A test piece was prepared by compression molding using the isobutylene-based block copolymer obtained in Production Example 1, and heat stability, mechanical properties, tear strength, water vapor permeability coefficient, oxygen permeability The coefficient was measured. Table 1 shows the results.

Comparative Example 1 A commercially available styrene-ethylenebutylene block copolymer (SEBS, Kr.
aton G1650) was dissolved in toluene and purified by dropping in isopropyl alcohol, and the heat resistance, mechanical properties, tear strength, water vapor permeability coefficient, and oxygen permeability coefficient were evaluated. Table 1 shows the results.

Example 2 A tube material was produced using the following raw materials. 100 parts by weight of the isobutylene-based block copolymer (SIBS) obtained in Production Example 1, polypropylene (propylene-ethylene block copolymer, Grand Polypro J705, manufactured by Grand Polymer) 50
100 parts by weight, paraffin-based process oil (Diana Process PW-380, manufactured by Idemitsu Kosan), antioxidant (Irganox 1010, manufactured by Ciba Geigy)
Five parts by weight were melt-kneaded using a Labo Plastomill (manufactured by Toyo Seiki) set at 170 ° C. A tube was prepared by compression molding the obtained composition, and various physical properties were evaluated.
Table 1 shows the evaluation results.

[0056]

[Table 1]

As is clear from Table 1, the tube materials obtained in the examples are excellent in heat stability, mechanical properties, tear strength, water vapor permeability, gas permeability, and flexibility. You can see that there is.

Using the tube material obtained in Example 2,
Tube by extrusion (outside diameter 8mm, inside diameter 6mm, thickness 1
mm). The extrudability was good and a uniform tube was obtained. Further, the obtained tube was flexible, and when a water flow test was performed, no leakage or the like was observed.

(Example 3) Using the polymer obtained in Production Example 1, a composition having the composition shown in Table 2 was prepared, and mechanical strength, tear strength, hardness, water vapor permeability, oxygen permeability, and resistance to oxygen were obtained. Abrasion and volume resistivity were measured. Table 3 shows the results.

Comparative Example 2 Commercially available styrene-ethylenebutylene block copolymer (SEBS, Kr manufactured by Shell Chemical Co., Ltd.)
atonG1650), a composition having the composition shown in Table 2 was prepared, and the same evaluation as in Example 3 was performed. Table 3 shows the results.

[0061]

[Table 2]

[0062]

[Table 3]

As is evident from Table 3, the blends using the polymers obtained in the production examples are excellent in balance between strength and flexibility, excellent in tear strength, excellent in moisture and gas barrier properties, and excellent in abrasion resistance. And the volume resistivity is large.

[0064]

According to the present invention, excellent properties such as heat stability, mechanical strength, tear strength, gas permeation resistance, water vapor permeation resistance, abrasion resistance, flexibility, and the like, and can be used in a wide temperature range. Thus, a tube material that can be easily recycled can be obtained.

Claims (16)

[Claims] 1. A tube material comprising an isobutylene-based block copolymer formed from a polymer block containing isobutylene as a main component and a polymer block containing a monomer component not containing isobutylene as a main component. 2. An isobutylene-based block copolymer is a polymer block composed of a monomer component containing no isobutylene as a main component.
Triblock having a structure of a polymer block composed of a monomer component not containing isobutylene as a main component, a polymer block composed of a monomer component containing no isobutylene as a main component-structure of a polymer block containing isobutylene as a main component Or a star-shaped block having three or more arms composed of a polymer block composed of a monomer component not containing isobutylene as a main component and a polymer block containing isobutylene as a main component, or a mixture thereof. Claim 1
Tube material as described. 3. The isobutylene-based block copolymer is a block copolymer composed of 5 to 80% by weight of a monomer not containing isobutylene as a main component and 95 to 20% by weight of a monomer containing isobutylene as a main component. The tubing of claim 1. 4. An isobutylene-based block copolymer comprising 15 to 40% by weight of a monomer not containing isobutylene as a main component,
The tube material according to claim 1, which is a block copolymer comprising 85 to 60% by weight of a monomer having isobutylene as a main component. 5. The tube material according to claim 1, wherein the number-average molecular weight of the isobutylene-based block copolymer is from 30,000 to 500,000. 6. The tube material according to claim 1, wherein the number-average molecular weight of the isobutylene-based block copolymer is from 50,000 to 400,000. 7. The tube material according to claim 1, wherein the monomer containing no isobutylene as a main component mainly contains an aromatic vinyl monomer. 8. The tubing material according to claim 1, wherein the monomer having no isobutylene as a main component is styrene. 9. A monomer not containing isobutylene as a main component,
The tube material according to claim 1, comprising at least one selected from the group consisting of α-methylstyrene, p-methylstyrene, vinylnaphthalene derivatives and indene derivatives. 10. The tube material according to claim 1, wherein the monomer containing no isobutylene as a main component comprises α-methylstyrene and / or a mixture of indene and styrene. 11. The tube material according to claim 1, further comprising a filler. 12. The tubing material according to claim 1, further comprising at least one selected from the group consisting of a polyolefin resin and, if necessary, a process oil, a filler and a stabilizer. 13. The tubing material according to claim 1, wherein the tubing material is an automobile part tubing material. 14. The tubing material according to claim 1, wherein the tubing material is a medical / medical tubing material. 15. The tube material according to claim 1, wherein the tube material is a food tube material. 16. The tube material according to claim 1, wherein the tube material is a tube material for civil engineering and construction.