WO2014017486A1 - インナーライナー用積層体およびそれを用いたタイヤ - Google Patents
インナーライナー用積層体およびそれを用いたタイヤ Download PDFInfo
- Publication number
- WO2014017486A1 WO2014017486A1 PCT/JP2013/069919 JP2013069919W WO2014017486A1 WO 2014017486 A1 WO2014017486 A1 WO 2014017486A1 JP 2013069919 W JP2013069919 W JP 2013069919W WO 2014017486 A1 WO2014017486 A1 WO 2014017486A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laminate
- inner liner
- rubber
- tire
- layer
- Prior art date
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Images
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- B32B2307/7244—Oxygen barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7246—Water vapor barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7248—Odour barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2405/00—Adhesive articles, e.g. adhesive tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
-
- 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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
- B60C2005/145—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre made of laminated layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31826—Of natural rubber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31924—Including polyene monomers
Definitions
- the present invention relates to a laminate for an inner liner (hereinafter, also simply referred to as “laminate”) and a tire using the same, and more particularly, to an laminate for an inner liner using a resin material and improvement of a tire using the laminate. .
- a rubber composition mainly composed of butyl rubber, halogenated butyl rubber or the like has been used for an inner liner disposed on the inner surface of a tire as an air barrier layer for maintaining the internal pressure of the tire.
- rubber compositions mainly composed of these butyl rubbers have low gas barrier properties, when using such a rubber composition for an inner liner, it is necessary to increase the thickness of the inner liner to a certain extent. It was an obstacle when trying to make it easier.
- Patent Document 1 discloses a technique for ensuring adhesiveness between adjacent rubber layers by providing adhesive layers made of an adhesive resin on both surfaces of a gas barrier layer made of a resin.
- the adhesive layer made of resin can ensure sufficient adhesion with the gas barrier layer, but the adhesion with the adjacent rubber layer is not sufficient, and the inner liner may be displaced during molding and vulcanization. There was room for it.
- an object of the present invention is to solve the above problems and to provide a laminated body for an inner liner using a resin film, and can sufficiently secure the adhesion between an adjacent member such as a carcass and the resin film. It is providing the laminated body for inner liners, and a tire using the same.
- the present inventors have found that the above problem can be solved by using a laminate in which a rubber layer made of a predetermined compound is disposed on both sides of a gas barrier layer made of a resin material.
- the present invention has been completed.
- the laminate for an inner liner of the present invention is disposed on both surfaces of a gas barrier layer made of a thermoplastic resin or a resin material made of a mixture of a thermoplastic resin and a thermoplastic elastomer, and the gas barrier layer.
- a laminated body for an inner liner comprising a rubber layer, The rubber layer contains at least a diene elastomer, the diene elastomer is modified with a compound containing a functional group having an affinity for the resin material, and at least one of the rubber layers is It contains a crosslinking agent.
- the compound preferably has any one of oxygen, nitrogen, and silicon, and the functional group is an epoxy group, a maleic anhydride group, an amino group, a carboxylic acid group, or a silicon-containing functional group. It is also preferable to select from among them.
- the resin material is preferably made of an ethylene-vinyl alcohol copolymer (EVOH).
- EVOH ethylene-vinyl alcohol copolymer
- the diene elastomer contains natural rubber.
- the rubber layer can be made of the same or different rubber composition.
- the rubber layer has the same tack value measured by a probe tack test according to JIS Z0237, or a layer located on the tire inner surface side when disposed on the tire inner surface. It is preferable that is smaller.
- the said crosslinking agent is sulfur or a peroxide, More preferably, it is sulfur.
- the thickness of each rubber layer is preferably in the range of 1 to 1000 ⁇ m, more preferably 1 to 500 ⁇ m, and even more preferably 5 to 200 ⁇ m.
- the tire of the present invention is characterized by using the laminate for an inner liner of the present invention.
- the present invention by adopting the above-described configuration, it is possible to realize a laminated body for an inner liner that can sufficiently ensure adhesion between an adjacent member such as a carcass and a resin film, and an inner The joint portion (splice portion) of the liner can be firmly bonded. As a result, it has become possible to obtain a tire having sufficient durability while meeting the demand for weight reduction.
- FIG. 1 the typical sectional drawing of the laminated body for inner liners of this invention is shown.
- the laminate for an inner liner of the present invention comprises a gas barrier layer 1 and rubber layers 2A and 2B disposed on both sides thereof.
- the gas barrier layer 1 is made of a thermoplastic resin or a resin material made of a mixture of a thermoplastic resin and a thermoplastic elastomer, and the rubber layers 2A and 2B are compatible with this resin material. It is important that it contains at least a diene elastomer modified with a compound containing a functional group having at least one of the rubber layers 2A and 2B and contains a crosslinking agent. That is, the gas barrier layer 1 made of a resin material ensures the gas barrier properties necessary for the inner liner, and the rubber layers 2A and 2B containing the specific diene elastomer are disposed as adhesive layers on both sides thereof.
- the rubber layers 2A and 2B are made to contain a diene elastomer modified with a compound containing a functional group having an affinity for the resin material constituting the gas barrier layer 1, so that the rubber Adhesiveness between the layers 2A and 2B and the gas barrier layer 1 can be ensured.
- the diene elastomer contained in the rubber layers 2A and 2B is co-crosslinked with the coating rubber constituting the carcass layer, in the present invention, the adhesiveness between the rubber layers 2A and 2B and the carcass layer 1 is determined. Can also be secured.
- the rubber layers 2A and 2B are disposed on both surfaces of the gas barrier layer 1, the rubber layers come into contact with each other at the overlap portion when the inner liner is wound in the tire circumferential direction at the time of tire molding. As a result, stronger adhesion is possible. Moreover, since both sides of the gas barrier layer 1 are covered with the rubber layers 2A and 2B, the gas barrier layer 1 is not directly exposed to air, and therefore, an effect of suppressing the moisture absorption of the gas barrier layer 1 can also be obtained. Moreover, deterioration of the gas barrier layer 1 due to sunlight can be suppressed.
- the gas barrier layer 1 is composed of a film or sheet made of a resin material.
- a resin material include thermoplastic resins such as polyamide resins, polyvinylidene chloride resins, polyester resins, ethylene-vinyl alcohol copolymer (EVOH) resins, and the like.
- EVOH ethylene-vinyl alcohol copolymer
- a mixture of a resin and a thermoplastic elastomer can be mentioned.
- the coefficient of oxygen permeation at 20 ° C. and 65% RH is less than 7.0 ⁇ 10 ⁇ 10 cm 3 ⁇ cm / cm 2 ⁇ sec ⁇ cmHg. What has it is suitable because it is excellent in gas barrier properties.
- a film or sheet made of a modified or unmodified EVOH resin can be suitably used as the gas barrier layer 1.
- Such a film or sheet can be produced by, for example, extrusion molding.
- the ethylene content is 25 to 50 mol%.
- the lower limit of the ethylene content of EVOH is preferably 30 mol% or more, and more preferably 35 mol% or more.
- the upper limit of the ethylene content of EVOH is 48 mol% or less, and more preferably 45 mol% or less.
- the ethylene content of EVOH is less than 25 mol%, the flex resistance, fatigue resistance and melt moldability may be deteriorated.
- the ethylene content exceeds 50 mol%, the desired content may be obtained. There is a risk that gas barrier properties may not be obtained.
- the saponification degree of EVOH is preferably 90% or more, more preferably 95% or more, still more preferably 98% or more, and most preferably 99% or more.
- the saponification degree of EVOH is less than 90%, the gas barrier property and the thermal stability during the formation of the inner liner may be insufficient.
- EVOH preferably has a melt flow rate (MFR) of 0.1 to 30 g / 10 min at 190 ° C. under a load of 2160 g, more preferably 0.3 to 25 g / 10 min.
- MFR melt flow rate
- EVOH having a melting point near 190 ° C. or 190 ° C. or higher MFR is measured at a temperature equal to or higher than the melting point under a load of 2160 g.
- a value obtained by plotting and extrapolating to 190 ° C. falls within the above range is regarded as a suitable EVOH.
- the thickness of the gas barrier layer 1 is preferably in the range of 1 to 500 ⁇ m, particularly 5 to 200 ⁇ m. If the thickness of the gas barrier layer 1 is too thin, sufficient gas barrier properties may not be obtained. On the other hand, if the thickness of the gas barrier layer 1 is too thick, the weight reduction of the tire is hindered, the bending resistance and fatigue resistance of the gas barrier layer 1 are lowered, and the bending deformation is likely to cause breakage and cracking. Since the generated cracks are easily extended, the internal pressure retention may be lowered when the vehicle is run while being incorporated in a tire.
- the gas barrier layer 1 is not limited to a single film or sheet, and is a laminated film or laminated sheet having a multilayer structure comprising two or more layers, preferably 10 or more layers, for example, 7 to 2050 layers. You may be comprised from.
- the laminated film or laminated sheet is not limited to the case where a film or sheet made of the same kind of resin material is used as long as adhesion between the laminated layers is ensured, but the film or sheet made of a different resin material.
- a film or sheet made of different thermoplastic resins in particular, a film or sheet made of thermoplastic elastomer may be laminated on each other.
- the rubber layers 2A and 2B contain at least a diene elastomer modified with a compound containing a functional group having an affinity with the resin material constituting the gas barrier layer 1.
- Such compounds include those having any of oxygen, nitrogen and silicon, and specific functional groups include epoxy groups, maleic anhydride groups, amino groups, carboxylic acid groups and silanes. And silicon-containing functional groups such as groups.
- the diene elastomer examples include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene rubber (NBR), and chloroprene rubber. (CR) etc. are mentioned.
- NR natural rubber
- IR isoprene rubber
- BR butadiene rubber
- SBR styrene-butadiene copolymer rubber
- NBR acrylonitrile-butadiene rubber
- chloroprene rubber etc.
- NR, BR, and SBR are preferable as the diene elastomer, and more preferably, at least NR is included.
- One of these diene elastomers may be used alone, or two or more thereof may be used in combination. In the present invention, it is particularly preferable to use natural rubber modified with an epoxy group for the rubber layer.
- At least one of the rubber layers 2A and 2B needs to contain a cross-linking agent, so that the rubber layer can be cured by vulcanization.
- a cross-linking agent such as peroxide or sulfur can be used from the viewpoint of adjusting the cross-linking speed and the elastic modulus.
- isocyanate as a crosslinking agent, and the effect of preventing adhesion to the bladder can be obtained by blending the isocyanate into the rubber layer and slightly crosslinking the rubber layer.
- isocyanate There are four types of isocyanate: (1) adduct type, (2) burette type, (3) prepolymer type, and (4) isocyanurate, and any of them may be used in the present invention.
- the rubber layers 2A and 2B can be blended with a crosslinking accelerator or a crosslinking acceleration assistant.
- the crosslinking accelerator include diphenylguanidine (DPG), tetramethylthiuram disulfide (TMTD), tetramethylthiuram monosulfide (TMTM), 2-mercaptobenzothiazole zinc salt (ZnBDC), 2-mercaptobenzothiazole (MBT), 2 -Benzothiazolyl disulfide (MBTS), N-cyclohexyl-2-benzothiazole sulfenamide (CBS), Nt-butyl-2-benzothiazole sulfenamide (BBS) and the like.
- the crosslinking acceleration aid include zinc white (zinc oxide).
- a filler may be contained in the rubber layers 2A and 2B.
- the filler include carbon black and silica.
- the rubber layers 2A and 2B may be made of the same rubber composition or different rubber compositions.
- the tack values measured by the probe tack test according to JIS Z0237 of the rubber layers 2A and 2B are the same, or on the tire inner surface side when disposed on the tire inner surface.
- the located layer is preferably smaller. This is to prevent the rubber layer from coming into close contact with the bladder or the like during tire molding.
- the thicknesses of the rubber layers 2A and 2B are each preferably 1 to 1000 ⁇ m, particularly 1 to 500 ⁇ m, more preferably 5 to 400 ⁇ m, and particularly preferably 5 to 200 ⁇ m. If the rubber layer is too thin, sufficient adhesive strength cannot be obtained, and the processing is complicated. On the other hand, if the rubber layer is too thick, the weight of the tire increases.
- the laminated body for an inner liner of the present invention is formed by sequentially laminating the rubber layer 2A, the gas barrier layer 1 and the rubber layer 2B with at least one release sheet and winding the roll on a roll. By cutting with a desired length, the tire can be easily produced.
- a general-purpose sheet can be used, and is not particularly limited. Specifically, for example, in addition to a polyethylene terephthalate (PET) film for release, a polyethylene (PE) sheet or cotton is used. A sheet or the like can also be used.
- Laminates cut to a desired length are rolled into a cylindrical shape on a tire molding drum and then joined together by overlapping the ends, or formed into a cylindrical shape with the required dimensions in advance. It can use for manufacture of a tire by arrange
- FIG. 2 shows a cross-sectional side view of an example of the tire of the present invention in the width direction.
- the illustrated tire has a tread portion 11 and a pair of sidewall portions 12 and bead portions 13 that are continuous on both sides thereof, and extends in a toroidal shape between bead cores 14 embedded in the pair of bead portions 13 respectively.
- the carcass 15 composed of one carcass ply that reinforces each of these parts is used as a skeleton.
- a belt layer 16 composed of two belts is disposed on the outer side of the crown portion of the carcass 15 in the tire radial direction, and an inner liner 17 is disposed on the inner surface of the tire inside the carcass 15.
- the laminate of the present invention is used as the inner liner 17, thereby making the tire lighter without causing problems such as displacement of the inner liner. It has become possible.
- the configuration other than the inner liner can be appropriately set according to a conventional method, and is not particularly limited.
- EVOH ethylene-vinyl alcohol copolymer having an ethylene content of 44 mol% and a saponification degree of 99.9% (190 ° C., MFR under a load of 2160 g: 5.5 g / 10 min) is placed in a pressure reaction vessel. 2 parts by mass and 8 parts by mass of N-methyl-2-pyrrolidone were charged and stirred at 120 ° C. for 2 hours to completely dissolve EVOH. To this, 0.4 part by mass of epoxypropane as an epoxy compound was added and then heated at 160 ° C. for 4 hours. After the heating, it was precipitated in 100 parts by mass of distilled water, and N-methyl-2-pyrrolidone and unreacted epoxypropane were sufficiently washed with a large amount of distilled water to obtain modified EVOH.
- the obtained modified EVOH was made finer to a particle size of about 2 mm with a pulverizer, it was sufficiently washed again with a large amount of distilled water. The washed particles were vacuum-dried at room temperature for 8 hours, and then melted at 200 ° C. using a twin-screw extruder to be pelletized.
- the obtained modified EVOH had a Young's modulus at 23 ° C. of 1300 MPa.
- the Young's modulus at 23 ° C. of the modified EVOH was measured by the following method.
- the ethylene content and the saponification degree of EVOH were obtained by 1 H-NMR measurement using deuterated dimethyl sulfoxide as a solvent (using “JNM-GX-500 type” manufactured by JEOL Ltd.). It is a value calculated from The melt flow rate (MFR) of EVOH was determined by filling a sample into a cylinder having an inner diameter of 9.55 mm and a length of 162 mm of a melt indexer L244 (manufactured by Takara Kogyo Co., Ltd.), melting at 190 ° C., A load was uniformly applied using a plunger of 2160 g and a diameter of 9.48 mm, and the amount of resin extruded per unit time (g / 10 minutes) from an orifice of 2.1 mm in diameter provided at the center of the cylinder was obtained.
- MFR melt flow rate
- melt flow rate MFR
- a total of 7 layers of multilayer films (film 1) in which 3 layers of modified EVOH (each 2 ⁇ m) and 4 layers (5 ⁇ m each) of thermoplastic polyurethane (TPU) (Kuramylon, Kuraray Co., Ltd.) were alternately laminated, Made by coextrusion.
- the resulting multilayer film was irradiated with an electron beam (acceleration voltage 200 kV, irradiation amount 100 kGy) to increase the strength of the film.
- a rubber composition (rubber layer 1) containing an epoxy group-modified natural rubber shown in Table 1 below was prepared, dissolved in a toluene solution, and formed by coating to form a 50 ⁇ m thick adhesive layer (rubber sheet). was disposed on both sides of the multilayer film to produce an inner liner of Example 1.
- Example 2 (Synthesis of flexible resin) A maleic anhydride-modified hydrogenated styrene-ethylene-butadiene-styrene block copolymer was synthesized by a known method and pelletized. The obtained maleic anhydride-modified hydrogenated styrene-ethylene-butadiene-styrene block copolymer had a Young's modulus at 23 ° C. of 3 MPa, a styrene content of 20%, and a maleic anhydride amount of 0.3 meq / g. The Young's modulus was measured by the same method as that for the modified EVOH.
- the modified EVOH and the flexible resin were kneaded with a twin screw extruder to prepare a resin composition.
- the content of the flexible resin in the resin composition was 20% by mass.
- the average particle diameter of the flexible resin in the resin composition was 1.2 ⁇ m when the sample of the obtained resin composition was frozen and then cut with a microtome and measured with a transmission electron microscope. .
- the Young's modulus at ⁇ 20 ° C. of this resin composition was measured in the same manner as in the method for measuring the Young's modulus of the modified EVOH, except that the set temperature was changed to ⁇ 20 ° C., and it was 750 MPa.
- thermoplastic polyurethane (Kuraray Co., Ltd. Kuramylon 3190)
- a multilayer film (film 2, TPU) under the following coextrusion molding conditions using a two-kind five-layer coextrusion device
- Extruder specifications for each resin Thermoplastic polyurethane: 25mm ⁇ extruder P25-18AC (Osaka Seiki Machine Co., Ltd.), Resin composition (C): 20 mm ⁇ extruder lab machine ME type CO-EXT (manufactured by Toyo Seiki Co., Ltd.), T-die specification: 500mm width, 2 types, 5 layers (manufactured by Plastic Engineering Laboratory Co., Ltd.) Cooling roll temperature: 50 ° C Pickup speed: 4m / min
- An adhesive layer (rubber sheet) having a thickness of 500 ⁇ m obtained by thinning the rubber composition (rubber layer 1) used in Example 1 with a roll is disposed on both surfaces of the multilayer film (film 2).
- An inner liner was prepared.
- Examples 3 to 9 and Comparative Example 1 The type of multilayer film, the type and thickness of the rubber composition used for the rubber sheet placed on both sides of the multilayer film were the same as in Example 1 except that they were changed as shown in Tables 2 and 3 below.
- the inner liners of Examples 3 to 9 and Comparative Example 1 were produced.
- each test inner liner was measured.
- tires having a tire size of 195 / 65R15 were prepared using each test inner liner, and evaluated for the presence or absence of a bladder during tire vulcanization (peeling due to adhesion of the inner liner to the bladder).
- each test tire was attached to a rim of size 6JJ to form a tire wheel, and was run on an indoor drum tester at 80 km / h by applying an air pressure of 160 kPa (relative pressure) and a tire load of 4.0 kN. And the presence or absence of peeling of the inner liner after the drum durability test was evaluated.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Tires In General (AREA)
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Abstract
Description
前記ゴム層が少なくともジエン系エラストマーを含有し、該ジエン系エラストマーが、前記樹脂材料と親和性を有する官能基を含む化合物で変性されてなり、かつ、該ゴム層のうちの少なくとも1層が、架橋剤を含有することを特徴とするものである。
図1に、本発明のインナーライナー用積層体の模式的断面図を示す。図示するように、本発明のインナーライナー用積層体は、ガスバリア層1と、その両面にそれぞれ配置されたゴム層2A,2Bとからなる。
<実施例1>
まず、加圧反応槽に、エチレン含量44モル%、ケン化度99.9%のエチレン-ビニルアルコール共重合体(EVOH)(190℃、2160g荷重下でのMFR:5.5g/10分)2質量部およびN-メチル-2-ピロリドン8質量部を仕込み、120℃で2時間加熱撹拌して、EVOHを完全に溶解させた。これに、エポキシ化合物としてのエポキシプロパン0.4質量部を添加後、160℃で4時間加熱した。加熱終了後、蒸留水100質量部に析出させ、多量の蒸留水で充分にN-メチル-2-ピロリドンおよび未反応のエポキシプロパンを洗浄し、変性EVOHを得た。
得られたペレットを用い、東洋精機(株)製の二軸押出機によって、下記押出条件で製膜し、厚さ20μmの単層フィルムを作製した。次に、このフィルムを用いて、幅15mmの短冊状の試験片を作製し、23℃、50%RHの条件下で恒温室内に1週間放置した後、(株)島津製作所製のオートグラフ[AG-A500型]を用いて、チャック間隔50mm、引張速度50mm/分の条件で、23℃、50%RHにおけるS-Sカーブ(応力-歪み曲線)を測定し、S-Sカーブの初期傾きからヤング率を求めた。
シリンダー、ダイ温度設定:C1/C2/C3/ダイ=200/200/200/200(℃)
(柔軟樹脂の合成)
無水マレイン酸変性水素添加スチレン-エチレン-ブタジエン-スチレンブロック共重合体を公知の方法により合成し、ペレット化した。得られた無水マレイン酸変性水素添加スチレン-エチレン-ブタジエン-スチレンブロック共重合体は、23℃におけるヤング率が3MPa、スチレン含量が20%、無水マレイン酸量が0.3meq/gであった。なお、ヤング率は、上記変性EVOHと同様の方法で測定した。
上記変性EVOHおよび柔軟樹脂を二軸押出機で混練し、樹脂組成物を調製した。ここで、樹脂組成物中の柔軟樹脂の含有率は20質量%であった。また、樹脂組成物中の柔軟樹脂の平均粒径は、得られた樹脂組成物の試料を凍結した後、この試料をミクロトームにより切片にして透過電子顕微鏡で測定したところ、1.2μmであった。さらに、設定温度を-20℃に変更した以外は、上記変性EVOHのヤング率の測定方法と同様にして、この樹脂組成物の-20℃におけるヤング率を測定したところ、750MPaであった。
各樹脂の押出機仕様:
熱可塑性ポリウレタン:25mmφ押出機P25-18AC(大阪精機工作(株)製),
樹脂組成物(C):20mmφ押出機ラボ機ME型CO-EXT(東洋精機(株)製),
Tダイ仕様:500mm幅2種5層用((株)プラスチック工学研究所製)
冷却ロールの温度:50℃
引き取り速度:4m/分
多層フィルムの種類、多層フィルムの両側に配置するゴムシートに用いるゴム組成物の種類および厚みを、それぞれ下記の表2,3中に示すように変えた以外は実施例1等と同様にして、実施例3~9および比較例1のインナーライナーを作製した。
2A,2B ゴム層
11 トレッド部
12 サイドウォール部
13 ビード部
14 ビードコア
15 カーカス
16 ベルト層
17 インナーライナー
Claims (14)
- 熱可塑性樹脂からなるか、または、熱可塑性樹脂と熱可塑性エラストマーとの混合物からなる樹脂材料よりなるガスバリア層と、該ガスバリア層の両面にそれぞれ配置されたゴム層とからなるインナーライナー用積層体であって、
前記ゴム層が少なくともジエン系エラストマーを含有し、該ジエン系エラストマーが、前記樹脂材料と親和性を有する官能基を含む化合物で変性されてなり、かつ、該ゴム層のうちの少なくとも1層が、架橋剤を含有することを特徴とするインナーライナー用積層体。 - 前記化合物が、酸素、窒素およびケイ素のうちのいずれかを有する請求項1記載のインナーライナー用積層体。
- 前記官能基が、エポキシ基、無水マレイン酸基、アミノ基、カルボン酸基および含ケイ素官能基のうちから選択される請求項1記載のインナーライナー用積層体。
- 前記樹脂材料が、エチレン-ビニルアルコール共重合体からなる請求項1記載のインナーライナー用積層体。
- 前記ジエン系エラストマーが天然ゴムを含有する請求項1記載のインナーライナー用積層体。
- 前記ゴム層のうち、タイヤ内面に配置された際にタイヤ内面側に位置する層が、架橋剤を含有する請求項1記載のインナーライナー用積層体。
- 前記ゴム層が、同種または異種のゴム組成物よりなる請求項1記載のインナーライナー用積層体。
- 前記ゴム層の、JIS Z0237に準拠するプローブタック試験により測定されるタックの値が、同一か、または、タイヤ内面に配置された際にタイヤ内面側に位置する層のほうが小さい請求項1記載のインナーライナー用積層体。
- 前記架橋剤が硫黄またはパーオキサイドである請求項1記載のインナーライナー用積層体。
- 前記架橋剤が硫黄である請求項9記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、1~1000μmの範囲である請求項1記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、1~500μmの範囲である請求項11記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、5~200μmの範囲である請求項12記載のインナーライナー用積層体。
- 請求項1記載のインナーライナー用積層体を用いたことを特徴とするタイヤ。
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EP13823256.6A EP2878457A4 (en) | 2012-07-27 | 2013-07-23 | LAMINATE FOR INTERNAL COATING AND TIRE USING THE SAME |
CN201380039775.3A CN104507707B (zh) | 2012-07-27 | 2013-07-23 | 气密层用层压体和使用其的轮胎 |
US14/416,331 US20150183270A1 (en) | 2012-07-27 | 2013-07-23 | Laminate for inner liner, and tyre using same |
JP2014526938A JP6338248B2 (ja) | 2012-07-27 | 2013-07-23 | インナーライナー用積層体およびそれを用いたタイヤ |
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JP2012-166917 | 2012-07-27 | ||
JP2012166917 | 2012-07-27 |
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PCT/JP2013/069919 WO2014017486A1 (ja) | 2012-07-27 | 2013-07-23 | インナーライナー用積層体およびそれを用いたタイヤ |
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US (1) | US20150183270A1 (ja) |
EP (1) | EP2878457A4 (ja) |
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CN (1) | CN104507707B (ja) |
WO (1) | WO2014017486A1 (ja) |
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WO2019004666A1 (ko) * | 2017-06-30 | 2019-01-03 | 코오롱인더스트리 주식회사 | 경량화된 고무 보강재, 그 제조방법 및 이를 포함하는 타이어 |
WO2021060309A1 (ja) * | 2019-09-24 | 2021-04-01 | 株式会社クラレ | 多層構造体、成形体及び成形体の製造方法 |
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MX2017003314A (es) * | 2014-09-12 | 2017-06-23 | Nike Innovate Cv | Membranas y usos de las mismas. |
CN105584072B (zh) * | 2015-12-21 | 2018-03-06 | 双钱集团(江苏)轮胎有限公司 | 一种新型的工程胎内衬层宽复合贴合方法 |
JP6814207B2 (ja) * | 2016-05-31 | 2021-01-13 | 株式会社クラレ | 積層体、多層構造体及びそれらの製造方法 |
JP2017214002A (ja) * | 2016-05-31 | 2017-12-07 | 株式会社ブリヂストン | 空気入りタイヤのインナーライナー、空気入りタイヤ及び空気入りタイヤの製造方法 |
WO2018112179A1 (en) * | 2016-12-15 | 2018-06-21 | Bridgestone Americas Tire Operations, Llc | Sealant layer with barrier, tire containing same, and related processes |
EP3554815A4 (en) | 2016-12-15 | 2020-09-02 | Bridgestone Americas Tire Operations, LLC | TIRE CONTAINING A SEALANT AND RELATED PROCESSES |
WO2021060308A1 (ja) * | 2019-09-24 | 2021-04-01 | 株式会社クラレ | 積層体 |
CN112895665B (zh) * | 2019-12-04 | 2022-09-06 | 北京橡胶工业研究设计院有限公司 | 高阻隔层叠体及其使用该层叠体的充气轮胎 |
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EP2878457A1 (en) | 2015-06-03 |
JP6338248B2 (ja) | 2018-06-06 |
CN104507707B (zh) | 2018-05-25 |
JPWO2014017486A1 (ja) | 2016-07-11 |
EP2878457A4 (en) | 2015-12-23 |
US20150183270A1 (en) | 2015-07-02 |
CN104507707A (zh) | 2015-04-08 |
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