JP2000038460A - Sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheet material comprising an isobutylenic block copolymer formed from a polymer block containing isobutylene as a main component, etc., and having excellent heat-resistant stability, mechanical strengths, tear strength, gas impermeability, steam impermeability, abrasion resistance, flexibility, electric insulation, etc. SOLUTION: This sheet material comprises an isobutylenic block copolymer formed from a polymer block containing isobutylene as a main component preferably in an amount of 95-20 wt.% and a polymer block not containing the isobutylene as a main component preferably in an amount of 5-80 wt.%. The isobutylenic block copolymer preferably comprises a triblock copolymer comprising a polymer block produced from one or more monomers not containing the isobutylene as a main component, a polymer block containing isobutylene as a main component and a polymer block not containing the isobutylene as a main component, and preferably has a number-average mol.wt. of 30,000-500,000.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to heat resistance, mechanical strength, tear strength, gas permeation resistance, water vapor permeation resistance,
The present invention relates to a sheet material which is excellent in various properties such as abrasion resistance, flexibility and electric insulation, can be used in a wide temperature range, and is easy to recycle.

[0002]

2. Description of the Related Art Various sheet materials represented by waterproof sheets in the field of civil engineering and construction, packaging sheets in the field of food, and the like have been developed.

[0003] Such sheet materials include, for example, mechanical strength, tear strength, heat resistance, weather resistance, heat resistance, chemical resistance, water vapor transmission resistance, gas transmission resistance, vibration absorption, insulation and the like. It is required to have good physical properties and excellent flexibility, workability, adhesiveness and the like. Until now, vulcanized rubbers, non-vulcanized rubbers, vinyl chlorides, polyethylenes and the like have been known as sheet materials, all of which have some drawbacks and can always be sufficiently satisfied. Not something. For example, a vulcanized rubber sheet has a problem in bonding strength, and a non-vulcanized rubber sheet such as an ethylene-vinyl acetate copolymer has a problem of low mechanical strength. Further, the vinyl chloride sheet has a problem that the plasticizer bleeds, and the polyethylene sheet has a problem that flexibility is low and workability is poor. Against this background, there is a need for the development of new sheet materials, especially in the automotive field, civil engineering and construction fields, where sheet materials may be exposed to vibration.
Development of a sheet material having excellent wear resistance is desired. Further, in the fields of medicine, medical treatment, and food, development of sheet materials having excellent gas barrier properties has been demanded from the viewpoint of preservability of drugs, foods, and the like. In addition, civil engineering and construction,
In the fields of medicine and medical treatment, the food field, and the electric and electronic fields, development of a sheet material having excellent moisture barrier properties is desired from the viewpoint of moisture proofing and waterproofing. In the electric and electronic fields, development of a sheet material having excellent electric insulation is desired.

[0004]

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 sheet material having excellent heat resistance, abrasion resistance, flexibility, and electrical insulation.

[0005]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, a sheet material comprising a specific block copolymer can overcome the above-mentioned problems. Excellent in heat resistance, mechanical strength, tear strength, gas permeability resistance, water vapor permeability resistance, abrasion resistance, flexibility, electrical insulation, etc., can be used in a wide temperature range, and is easy to recycle. Thus, the present invention has been completed. That is, the present invention provides a sheet 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.

[0006] 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.

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.

[0008] 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.

[0010] As an example of the above, it can also consist of a mixture of α-methylstyrene and / or indene and styrene.

The sheet material may further contain a filler, and may contain at least one selected from the group consisting of a polyolefin resin and, if necessary, a process oil, a filler and a stabilizer.

Specifically, the sheet material is suitably used as any of sheet materials for civil engineering and construction, sheet material for automobile parts, sheet material for medicine and medical treatment, sheet material for food, and sheet material for electric and electronic parts. Can be.

[0013]

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 refers to 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 the 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.

Examples of the aromatic vinyl monomer 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 is preferably a monomer component containing an aromatic vinyl monomer as a main component in view of the balance between physical properties and polymerization characteristics. Further, as the aromatic vinyl monomer, it is preferable to use one or more monomers selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, vinylnaphthalene derivatives and indene derivatives. From the viewpoint of cost, it is particularly preferable to use styrene, α-methylstyrene, indene or a mixture thereof.

The monomer component containing isobutylene as the main component of the present invention represents a monomer component containing 50% by weight or more, preferably 80% by weight or more, more preferably 90% by weight or more of isobutylene. It may or may not contain other monomers. 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 proportion 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 viewpoint 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, mechanical properties may not be sufficiently exhibited, while if it exceeds the above range, it is disadvantageous in terms of fluidity and processability. It is.

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

[0027]

Embedded image (Wherein, a plurality of R ¹ are the same or different, .R ² representing a monovalent hydrocarbon group having a hydrogen atom or 1 to 6 carbon atoms, 1
Represents a monovalent or polyvalent aromatic hydrocarbon group or 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 these, 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 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 be present. 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 mol with respect to the compound represented by the above general formula (I), but a preferable use amount is 0.3 to 50 times by mol. Range.

Further, if necessary, an electron donor component may be present in the polymerization system. 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 polymerization 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, methyl chloride,
Halogenated hydrocarbons such as dichloromethane, n-propyl chloride, n-butyl chloride and chlorobenzene;
Alkylbenzenes such as benzene, toluene, xylene, ethylbenzene, propylbenzene, and butylbenzene; ethane, propane, butane, pentane, hexane,
Linear aliphatic hydrocarbons such as heptane, octane, nonane, and decane; 2-methylpropane, 2-methylbutane,
Branched aliphatic hydrocarbons such as 2,3,3-trimethylpentane and 2,2,5-trimethylhexane; cycloaliphatic hydrocarbons such as cyclohexane, methylcyclohexane and ethylcyclohexane; hydrogenated petroleum fractions Refined paraffin oil and the like can be mentioned.

These solvents are 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 can be appropriately designed depending on the characteristics of the target polymer. First, the molecular weight of the obtained polymer can be determined from 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 (I).
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 the 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 sheet material of the present invention may be composed of the above isobutylene-based block copolymer alone, or may be composed of a multilayer structure in combination with another sheet material.

[0038] The sheet 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 performance such as strength of the sheet material.

Examples of the filler and reinforcing material include glass fiber, carbon black, flake graphite, carbon fiber, calcium sulfate, calcium carbonate, calcium silicate, alumina, silica, titanium oxide, talc, and mica. 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 sheet material of the present invention can be used by adding a polyolefin-based resin and, if necessary, a process oil, a filler, or a stabilizer.

Here, as the polyolefin resin,
α-olefin homopolymers, random copolymers, block copolymers and mixtures thereof, or random copolymers, block copolymers and graft copolymers of α-olefins with other unsaturated monomers And oxidation of these polymers,
Halogenated or sulfonated compounds can be used alone or in combination of two or more. 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, polypropylene resin such as chlorinated polypropylene, Examples thereof include polybutene, polyisobutylene, polymethylpentene, and a (co) polymer of a cyclic olefin. 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 preferably 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, pine oil, olive oil and the like, and examples of the synthetic system include 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 sheet 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 sheet material obtained in the present invention can be formed by a known method, for example, injection molding, extrusion molding, compression molding, calender molding or the like.

The sheet material obtained by the present invention can be used in, but not limited to, the fields of civil engineering and construction, the field of automobiles, the field of medicine and medical care, the field of foods, and the field of electricity and electronics.

[0046]

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 sheet 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 molded article to be a test piece was prepared by compression molding, and the test piece was left in a hot air oven set at 120 ° C. 7
After a day, 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 In accordance with JIS K 6252, an angle-shaped test piece with no cut was prepared, and the tear strength was measured.

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

(7) Abrasion resistance The Akron abrasion test B was measured according to JIS K6264. Tilt angle is 15 degrees, weight 2.57kg
f, measured at a rotation speed of 75 rpm.

(8) Hardness 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). The obtained isobutylene-based block copolymer (SI
GPC analysis of BS) revealed that the number average molecular weight was 1
02,000, molecular weight distribution was 1.15. The styrene content was 29% by weight.

(Example 1) Using the isobutylene-based block copolymer obtained in Production Example 1, 1-2
A sheet having a thickness of mm was prepared, and the heat resistance, mechanical properties, tear strength, water vapor permeability coefficient, and oxygen permeability coefficient were measured. Table 1 shows the results.

Comparative Example 1 Commercially available styrene-ethylene butylene 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 sheet material was manufactured using the following raw materials. 100 parts by weight of the isobutylene-based block copolymer (SIBS) obtained in Production Example 1, 50 parts by weight of polypropylene (propylene-ethylene block copolymer, Grand Polypro J705, manufactured by Grand Polymer), paraffin-based process oil (Diana Process) PW-380, manufactured by Idemitsu Kosan) 100 parts by weight, antioxidant (Irganox 1010, manufactured by Ciba-Geigy) 0.5
The parts by weight were melt-kneaded using a Labo Plastomill (manufactured by Toyo Seiki) set at 170 ° C. The obtained composition was compression molded to form a sheet, and various physical properties were evaluated. Table 1 shows the evaluation results.

[0059]

[Table 1] As is clear from Table 1, the sheet materials obtained in the examples are excellent in heat stability, mechanical properties, and tear strength, and are excellent in water vapor permeability, gas permeability, and flexibility. .

(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 water were obtained. Abrasion and volume resistivity were measured. Table 3 shows the results.

Comparative Example 2 Commercially available styrene-ethylene butylene block copolymer (SEBS, Kr.
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.

[0062]

[Table 2]

[0063]

[Table 3] As is clear from Table 3, the blend using the polymer obtained in the production example is excellent in balance between strength and flexibility, excellent in tear strength, moisture and gas barrier properties, excellent in abrasion resistance, and It can be seen that the volume resistivity is large.

[0064]

According to the present invention, various characteristics such as heat stability, mechanical strength, tear strength, gas permeability, water vapor permeability, abrasion resistance, flexibility, electric insulation, etc. are excellent and a wide temperature range. A sheet material that can be used in a range and is easy to recycle can be obtained.

Claims (17)

[Claims] 1. A sheet 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. A polymer block comprising a monomer component not containing isobutylene as a main component, wherein the isobutylene-based block copolymer is a polymer block containing 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
The sheet material described in the above. 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 sheet material according to 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 sheet material according to claim 1, which is a block copolymer comprising 85 to 60% by weight of a monomer containing isobutylene as a main component. 5. The sheet material according to claim 1, wherein the number average molecular weight of the isobutylene block copolymer is from 30,000 to 500,000. 6. The sheet 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 sheet material according to claim 1, wherein the monomer containing no isobutylene as a main component contains an aromatic vinyl monomer as a main component. 8. The sheet material according to claim 1, wherein the monomer containing no isobutylene as a main component is styrene. 9. A monomer not containing isobutylene as a main component,
The sheet material according to claim 1, wherein the sheet material comprises at least one selected from the group consisting of α-methylstyrene, p-methylstyrene, a vinylnaphthalene derivative, and an indene derivative. 10. The sheet 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 sheet material according to claim 1, further comprising a filler. 12. The sheet 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 sheet material according to claim 1, wherein the sheet material is a sheet material for civil engineering or construction. 14. The sheet material according to claim 1, wherein the sheet material is a sheet material for an automobile part. 15. The sheet material according to claim 1, wherein the sheet material is a medical / medical sheet material. 16. The sheet material according to claim 1, wherein the sheet material is a food sheet material. 17. The sheet material according to claim 1, wherein the sheet material is a sheet material for electric / electronic parts.