Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
  • B60C1/0008—Compositions of the inner liner
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/005—Processes for mixing polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L21/00—Compositions of unspecified rubbers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
  • C08L9/06—Copolymers with styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0016—Plasticisers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/22—Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
  • C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
  • C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
  • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
  • C08L23/283—Halogenated homo- or copolymers of iso-olefins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Definitions

• the present invention relates to an elastomer composition, a method for producing the same and a pneumatic tire using the same. More specifically, it relates to an elastomer composition having an excellent flexibility and low temperature durability, while maintaining the characteristics of the resin, a method for producing the same and a pneumatic tire using the same.
• thermoplastic elastomer composition comprising a matrix (i.e., a continuous phase) of a thermoplastic resin, in which a rubber is finely dispersed (i.e., a dispersed phase) is known. It is known in the art that an island-in-sea structure, in which the rubber is surrounded with the resin, is formed under the conditions satisfying the formula (IV) explained later (e.g., see Japanese Patent Publication (A) No. 2000-159936). To obtain a rubbery elastomer from a composition obtained in a state where a thermoplastic resin forms a matrix, it is necessary to increase the amount of rubber as much as possible.
• thermoplastic resin serving as the continuous phase and the elastomer component serving as the dispersed phase invert in phase, and, therefore, the thermoplastic elastomer composition thus prepared does not exhibit the fluidity of the thermoplastic resin and the shaping becomes impossible. Therefore, there have been limits to the amount of rubber which could be compounded.
• an object of the present invention is to provide an elastomer composition (C) having a flexible and low temperature durability comprising a matrix of a relatively small amount of a thermoplastic resin (A), in which a relatively large amount of an elastomer component (B) is finely dispersed, a method for producing the same and a pneumatic tire using the same.
• an elastomer composition (C) comprising a matrix of a thermoplastic resin (A), in which a dispersed phase of an elastomer component (B) is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component (B) satisfy the following formula (I):
• ⁇ d and ⁇ d indicate a volume ratio and a melt viscosity of the elastomer component (B), and ⁇ m and ⁇ m, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A)) and a pneumatic tire using the same.
• thermoplastic resin (A) a thermoplastic resin (A)
• elastomer component (B) a plasticizer (D) in a ratio satisfying the following formulae (II) and (III):
• ⁇ d and ⁇ d respectively, indicate a volume ratio and a viscosity of the elastomer component (B)
• ⁇ m indicates a volume ratio of the thermoplastic resin (A)
• ⁇ l indicates a volume ratio of the plasticizer (D)
• ⁇ ml indicates a melt viscosity of a mixture of the thermoplastic resin (A) and the plasticizer (D);
• thermoplastic resin for example, it is possible to prepare an inner liner having a combination of heat resistance, low gas permeability, chemical resistance and high dynamic durability when using Nylon, as the thermoplastic resin, and using a butyl-based rubber as the elastomer. Due to similar characteristics, it is also possible to use the elastic body for hose inner liners, packing, etc.
• the inventors engaged in research to solve the above problems and, as a result, found that, by mixing and shaping a thermoplastic resin (A), an elastomer component (B) and a plasticizer (D) in a composition satisfying the above formula (II) to obtain an island-in-sea structure, where the resin (A) forms the sea and the elastomer (B) forms the islands. After the final shape is formed, a part of the composition is removed, it becomes possible to obtain an island-in-sea structure having a highly increased ratio of the elastomer more than the limit ordinarily obtainable, whereby a flexible elastic body due to the high amount of elastomer, while maintaining the characteristics of the matrix thermoplastic resin (A).
• thermoplastic elastomer composition comprised of a matrix of a thermoplastic resin component, in which an elastomer component is dispersed
• the following conditions are necessary. That is, when a volume ratio of the thermoplastic resin component forming the matrix (i.e., continuous phase) is ⁇ m, a viscosity at the time of melt mixing is ⁇ m, a volume ratio of the elastomer component forming the dispersed phase is ⁇ d, a viscosity under the same conditions is ⁇ d, it is necessary to mix the two components so that the value of
• thermoplastic resin component becomes the continuous phase (i.e., matrix) and the elastomer component becomes the dispersed phase (i.e., domain), and, therefore, molding becomes possible by the molding method of thermoplastic resins, but when a is 1 or more, the continuous phase and the dispersed phase are inverted, and, therefore, the thermoplastic elastomer composition thus prepared does not exhibit the fluidity of a thermoplastic resin and, therefore, molding by a molding machine for resin becomes possible.
• the present invention provides an elastomer composition, where it is maintained in such a state that a thermoplastic resin component (A) is a continuous phase (i.e., matrix) and an elastomer component (B) is a dispersed phase (i.e., domain), the volume ratio of the elastomer component (B) in the resin is increased to an extent which could not be realized in a conventional production method and a method for producing the same.
• a thermoplastic resin component (A) is a continuous phase (i.e., matrix)
• an elastomer component (B) is a dispersed phase (i.e., domain)
• thermoplastic resin component (A) in which an elastomer component (B) is present as a dispersed phase (i.e., domain), is formed.
• the plasticizer (D) is compounded into the thermoplastic resin component (A) as a pseudo resin component, together with the elastomer component (B), so as to satisfy the following conditions:
• ⁇ d and ⁇ d respectively, indicate a volume ratio and a viscosity of the elastomer component (B)
• ⁇ m indicates a volume ratio of the thermoplastic resin (A)
• ⁇ l indicates a volume ratio of the plasticizer (D)
• ⁇ ml indicates a melt viscosity of a mixture of the thermoplastic resin (A) and the plasticizer (D)).
• thermoplastic elastomer composition (E) comprising a thermoplastic resin component (A) including a plasticizer (D) forming a continuous phase (i.e., matrix) and an elastomer component (B) forming a dispersed phase (i.e., domain) is first produced.
• the formula (III) shows that, when the viscosity ratio ⁇ ml/ ⁇ d is made within a range of 0.8 to 1.2, it is possible to make the dispersed particles of the elastomer smaller. It is known in the art that, when the dispersed particles is made smaller, the durability is improved (See Japanese Patent Publication (A) No. 2000-159936).
• ⁇ 1/( ⁇ m+ ⁇ 1) is 0.05 to 0.6, more preferably 0.1 to 0.3.
• the elastomer composition (C) is produced by evaporating, extracting or migrating the plasticizer (D) from the composition (E). Note that this elastomer composition (C) loses its thermoplasticity.
• thermoplastic resin (A) usable for preparation of the elastomer composition (C) of the present invention one or more types of thermoplastic resins may be used.
• resin component polyamide-based resins (e.g., Nylon 6 (N6), Nylon 66 (N66), Nylon 46 (N46), Nylon 11 (N11), Nylon 12 (N12), Nylon 610 (N610), Nylon 612 (N612), Nylon 6/66 copolymer (N6/66), Nylon Jun.
• polyester-based resin e.g., aromatic polyesters such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET/PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polyoxyalkylene diimidic acid/polybutylene terephthalate copolymer), polynitrile-based resins (e.g., polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile/styrene copolymer (AS), methacrylonitrile/styrene copolymer, methacrylonitrile/styrene
• thermoplastic resin (A) forming the matrix of the elastomer composition fillers, reinforcing agents, processing aids, stabilizers, antioxidants, etc. generally used for improving the workability, dispersability, heat resistance, antioxidation ability, etc. may be compounded, if necessary.
• the elastomer component (B) usable for the preparation of the elastomer composition according to the present invention may be an elastomer composition comprising an elastomer component, in which the usual rubber compounding agents including the vulcanization compounding components have been compounded.
• it may be an elastomer composition comprising the elastomer component, in which the usual rubber compounding agents other than the vulcanization compounding components have been compounded.
• elastomer component natural rubber, synthetic polyisoprene rubber (IR), epoxylated natural rubber, styrene-butadiene rubber (SBR), polybutadiene rubber (BR), nitrile-butadiene rubber (NBR), hydrogenated NBR, hydrogenated SBR, or other such diene-based rubbers and their hydrogenated compounds; ethylene propylene rubber (EPDM, EPM), maleic acid-modified ethylene- ⁇ -olefin copolymer (M-PO), butyl rubber (IIR), isobutylene and aromatic vinyl or diene-based monomer copolymer, acryl rubber (ACM), ionomer, or other such olefin-based rubbers; Br-IIR, Cl-IIR, a bromide of isobutylene paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydrin rubber (CHC, CHR), chlorosulfonated polyethylene
• the elastomer component (B) forming the dispersed phase of the elastomer composition (C) according to the present invention may also be dynamically vulcanized.
• the vulcanization agent, vulcanization aid and vulcanization conditions (e.g., temperature and time) etc. in the case of dynamic vulcanization may be appropriately determined depending upon the composition of the elastomer component (B) added and is not particularly limited.
• As the vulcanization agent general rubber vulcanization agents (e.g., cross-linking agents) may be used.
• sulfur-based vulcanization agents powdered sulfurs, precipitated sulfurs, dispersible sulfurs, surface treated sulfurs, insoluble sulfurs, dimorpholine disulfides, alkylphenol sulfides, etc. may be mentioned.
• powdered sulfurs precipitated sulfurs, dispersible sulfurs, surface treated sulfurs, insoluble sulfurs, dimorpholine disulfides, alkylphenol sulfides, etc.
• elastomer component or polymer
• organic peroxide system vulcanization agent benzoyl peroxide, t-butylhydroperoxide, 2,4-dichlorobenzoyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethylhexane-2,5-di(peroxylbenzoate), etc. may be mentioned. For example, about 1 to 20 parts by weight may be used.
• phenol resin-based vulcanization agent a mixed cross-linking system containing a bromide of an alkylphenol resin, stannous chloride, chloroprene, or another halogen donor and an alkylphenol resin etc. may be illustrated. For example, about 1 to 20 parts by weight may be used.
• zinc white about 5 parts by weight
• magnesium oxide about 4 parts by weight
• litharge about 10 to 20 parts by weight
• p-quinone dioxime about 5 parts by weight
• p-dibenzoylquinine oxime about 10 to 20 parts by weight
• tetrachloro-p-benzoquinone poly-p-dinitrosobenzene
• poly-p-dinitrosobenzene about 2 to 10 parts by weight
• methylene dianiline about 0.2 to 10 parts by weight
• a vulcanization accelerator may also be added.
• an aldehyde-ammonia-based, guanidine-based, thiazole-based, sulfonamide-based, thiuram-based, dithio acid salt-based, thiourea-based, or other general vulcanization accelerators may be used in an amount of, for example, about 0.5 to 2 parts by weight.
• a general aid for rubber may be used together. For example, stearic acid, oleic acid, and their Zn salts (about 2 to 4 parts by weight) etc. may be used.
• the elastomer component (B) forming the dispersed phase may have suitably compounded, in addition to the above compounding agents, a softening agent, antioxidant, processing aid, etc. generally compounded for improving the dispersability, heat resistance, etc. if necessary.
• alkylbenzene sulfonamide As the plasticizer (D) usable in the method of production of the present invention, alkylbenzene sulfonamide, diallyl phthalate, dioctyl phthalate, dioctyl sebacate, dioctyl adipate, diisodecyl phthalate, butylbenzyl phthalate, tricresyl phosphate, trimellitic acid isononyl ester and other esters, methanol, ethanol, 2-propanol, and other alcohols, paraffin oil, naphthene oil, aromatic oil, and other petroleum-based oils etc. may be used, but from the viewpoints of a high boiling point and solubility with resins, alkylbenzene sulfonamide is preferable.
• the method for producing of an elastomer composition (C) comprising a matrix resin (A), in which an elastomer (B) is finely dispersed may, for example, be as follows: First, the elastomer and, if necessary, the compounding agents are compounded, in advance, using a general kneader, Banbury mixer, etc. until obtaining a homogeneous mixed state to prepare an elastomer component (B). At this time, the elastomer component (B) may have suitable amounts of carbon black, oil, or calcium carbonate or another filler added thereto.
• thermoplastic resin (A) forming the matrix, the plasticizer (D), and the antioxidant or other compounding agents compounded, if necessary, are charged into a twin-screw kneader etc. and kneaded to prepare a thermoplastic resin component (A) forming the matrix.
• the resin component (A) thus prepared and the elastomer component (B) are charged into a twin-screw extruder etc. for melt mixing.
• the vulcanization compounding agents may be added at the stage where sufficient mixing has been performed and further mixed to dynamically cross-link the elastomer component and obtain a thermoplastic elastomer composition (E).
• the various compounding agents may be added to the thermoplastic resin component (A) or elastomer component (B) by mixing, in advance, before the above twin-screw kneading, but may also be added during the above twin-screw kneading.
• the matrix resin, elastomer, various compounding agents and the plasticizer may be kneaded by a twin-screw kneader etc. all at once, but in that case, it is necessary to sufficiently knead the matrix resin and the plasticizer, then add the elastomer.
• the kneading of these elastomer component (B) and the matrix resin component (A) and the melt kneading of the elastomer composition should be conducted under the condition of a temperature, at which a thermoplastic resin melts, or more. Further, the shear rate at the time of kneading is preferably 500 to 7500 sec ⁇ 1 , while the kneading time is preferably about 30 seconds to 10 minutes.
• thermoplastic elastomer composition (E) thus obtained is then formed into a sheet, film or tube, using a T-type sheeting die, a straight or crosshead structure tubing die, a cylindrical die for inflation molding, etc. at the front end of a single-screw extruder, then a part or all of the plasticizer (D) is removed by evaporation with oven heating, by migration with laminating with rubber, etc, followed by heat pressing, or by extraction using a solvent such as methanol, etc. to thereby obtain the shaped articles of the elastomer composition (C).
• a solvent such as methanol
• thermoplastic elastomer composition (E) containing a plasticizer is adhered in a laminated state with rubber to, for example, the innermost layer of a tire or hose, the resultant assembly is formed into the final shape, then heat pressing is used to move the plasticizer (D) into the rubber so as to obtain a low permeability layer formed from the elastomer composition (C).
• This layer is composed of a resin as a matrix and rubber as a dispersed phase, with an extremely large amount of rubber and, therefor, becomes a flexible layer having a superior dynamic endurance like rubber, while maintaining the characteristics of the resin, for example, the low permeability, heat resistance and chemical resistance.
• the elastomer and cross-linking agent were mixed in an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare a compound, which was then pelletized by a rubber pelletizer (made by Moriyama Manufacturing Co., Ltd.).
• a plasticizer for resin i.e.
• the pellets thus prepared were formed into a sheet by a T-die molding machine, the plasticizer was removed by extraction using methanol, then the sheet was dried in a vacuum oven at 70° C. for 12 hours to completely remove the methanol, whereby a sheet of the elastomer composition was obtained.
• the elastomer and the cross-linking agent were mixed in an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare an elastomer composition, which was then pelletized by a rubber pelletizer (Moriyama Manufacturing Co., Ltd.).
• a plasticizer for resin (butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.) was added to about 30% by weight, based upon the weight of the resin and kneaded by a twin-screw kneader (made by Japan Steel Works), then the plasticizer-containing resin obtained and the elastomer pellets were kneaded again by a twin-screw-type kneader (made by Japan Steel Works) to prepare pellets of a plasticizer-containing elastomer composition, which was (dynamically vulcanized.
• the pellets prepared were formed into a sheet by a T-die molding machine, which was then dried in a vacuum oven at 180° C. for 30 hours to evaporate off the plasticizer, whereby a sheet of the elastomer composition was obtained.
• the elastomer and the cross-linking agent were mixed in an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare an elastomer composition, which was the pelletized by a rubber pelletizer (Moriyama Manufacturing Co., Ltd.).
• a plasticizer for resin (butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.) was added to about 30% by weight, based upon the weight of the resin and kneaded by a twin-screw kneader (made by Japan Steel Works), then the plasticizer-containing resin obtained and the elastomer pellets were kneaded again by a twin-screw kneader (made by Japan Steel Works) to prepare pellets of a plasticizer-containing elastomer composition, which was dynamically vulcanized.
• a plasticizer for resin butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.
• the pellets prepared were formed into a sheet by a T-die molding machine, which was then sandwiched between 2 mm sheets of a rubber compound having the following composition and then heat pressed at 180° C. for 15 minutes to evaporate the plasticizer, whereby the plasticizer is migrated to the rubber compound to thereby obtain a sheet of the elastomer composition.
• Air permeability According to JIS K 7126 “Test Method for Gas Permeability of Plastic Film and Sheet (Method A)”
• Test piece A film sample prepared in each Example was used
• Test temperature 30° C.
• M50 ( ⁇ 20° C.): Determined according to JIS K6251 at ⁇ 20° C.
• Constant strain test at ⁇ 20° C. A JIS No. 3 dumbbell was used to apply repeated strain of 40% by a constant strain tester (made by Ueshima Seisakusho Works) at ⁇ 20° C. or less. Samples with points of 70% breakage rates by a Weibull plot exceeding 1 million cycles were judged as passing.
• Plasticizer-containing Nylon 11 150 Pa ⁇ s
• Plasticizer-containing Nylon 6,66 200 Pa ⁇ s
• Each elastomer and the cross-linking agent were mixed by an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare a compound, which was then pelletized by a rubber pelletizer (made by Moriyama Seisakusho). Pellets of the compound and the pellets of the resin were kneaded by a twin screw kneader (made by Japan Steel Works). A part thereof was inverted in phase and could not be kneaded due to the fact that the rubber ratio is too high.
• the pellets prepared were formed into sheets by a T-die molding machine to obtain sheets of a thermoplastic elastomer composition. The sheets obtained were determined for physical properties as explained above. The results are shown in Table II.
• Each elastomer and cross-linking agent were mixed by an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare a compound, which was then pelletized by a rubber pelletizer (made by Moriyama Seisakusho).
• a plasticizer for resin (butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.) was added in an amount of about 30% by weight based upon the weight of the resin and kneaded by a twin-screw kneader (made by Japan Steel Works), then the plasticizer-containing resin obtained and the rubber pellets were kneaded again by a twin-screw kneader (made by Japan Steel Works) to prepare pellets of a plasticizer-containing elastomer composition.
• the pellets prepared were formed into sheets by a T-die molding machine to obtain sheets of a thermoplastic elastomer composition.
• the sheets obtained were measured for physical properties as explained above. The results are shown in Table III.
• Air leakage test The material described in each Example (thickness 0.15 mm) was used as an inner liner to prepare a 195/65/R15 size tire. The change in internal pressure at an initial air pressure of 250 KPa and a 25° C. atmosphere was measured over three months. The tire was compared with a tire using a standard inner liner of butyl rubber/natural rubber 80/20% by weight. A tire with at least the same retention rate of internal pressure was judged as passing, while one with less was judged as failing.
• thermoplastic resins it is possible to obtain a flexible elastic body, while maintaining the characteristics of the thermoplastic resins, and, therefore, for example, it is possible to prepare an inner liner having heat resistance, low gas permeability, chemical resistance and high dynamic durability and, due to similar properties, it is possible to use the same for other parts of pneumatic tires, hose inner tubes, packing, etc.

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