KR20130103425A - Film for tire inner-liner and preparation method thereof, pneumatic tire, and preparation method of pneumatic tire - Google Patents

Abstract

PURPOSE: A film for a tire innerliner is provided to have excellent and uniform physical properties in all directions when applied to a tire and to have excellent durability and fatigue resistance in a tire manufacturing process and driving of a vehicle. CONSTITUTION: A film for a tire innerliner includes a biaxially elongated substrate film which is elongated in a first direction by 5-50 % and not elongated in a second direction vertical to the first direction; and an adhesive layer formed on at least one side of the substrate film. The first direction is parallel to the axis direction of a tire molding drum. The strength ratio of the first direction to the second direction of the substrate film is 1.1:1-2:1. The first direction is the transverse direction of the substrate film, and the second direction is the machine direction of the substrate film. [Reference numerals] (1) Tread; (2) Shoulder; (3) Side wall; (4) Cap ply; (5) Belt; (6) Body ply; (7) Inner liner; (8) Apex; (9) Bead

Description

FILM FOR TIRE INNER-LINER AND PREPARATION METHOD THEREOF, PNEUMATIC TIRE, AND PREPARATION METHOD OF PNEUMATIC TIRE}

The present invention relates to a film for a tire inner liner, a method for manufacturing a tire inner liner film, a pneumatic tire and a pneumatic tire manufacturing method, and more specifically, when applied to a tire, it can exhibit uniform and excellent physical properties in all directions. And a tire inner liner film capable of securing excellent durability and fatigue resistance even in a tire manufacturing process or an automobile driving process, a method of manufacturing the tire inner liner film, a pneumatic tire to which the tire inner liner film is applied, and the A pneumatic tire manufacturing method using a film for tire innerliner.

The tires support the load of the vehicle, alleviate the impact from the road surface, and transmit the driving or braking force of the vehicle to the ground. In general, a tire is a composite of fiber / steel / rubber and generally has a structure as shown in FIG. 1.

Tread (1): This part is to be in contact with the road surface to provide the necessary frictional force for braking and driving, to have good abrasion resistance, to withstand external shocks, and to generate little heat.

Body Ply (or Carcass) (6): A layer of cord inside the tire, which must support loads, withstand impacts, and be resistant to fatigue during rolling.

Belt (5): Located between the body plies, consisting of steel wires in most cases to mitigate external shocks and maintain a wide tread ground to provide excellent driving stability.

Side Wall (3): refers to the rubber layer between the lower part of the shoulder (2) from the bead (9) and serves to protect the body ply (6) inside.

Inner Liner (7): Located on the inside of the tire instead of the tube, it prevents air leakage to enable pneumatic tires.

BEAD (9): A square or hexagonal wire bundle with rubber coating on the wire that rests and secures the tire to the rim.

CAP PLY (4): A special cord paper placed on the belt of some passenger radial tires that minimizes belt movement when driving.

APEX (8): A triangular rubber filler used to minimize the dispersion of beads, to mitigate external impacts, to protect the beads, and to prevent the ingress of air during molding.

Recently, tube-less tires in which high pressure air of about 30 to 40 psi is injected without the use of a tube are commonly used. To this end, a highly airtight inner liner is disposed in the carcass inner layer.

Previously, tire innerliners were used, with rubber components such as butyl rubber or halo butyl rubber, which had relatively low air permeability, and had to increase the rubber content or the thickness of the inner liner in order to obtain sufficient airtightness. . However, when the content of the rubber component and the tire thickness increase, there is a problem in that the total tire weight increases and fuel economy of the vehicle decreases.

In addition, the rubber components have relatively low heat resistance, such that air pockets are formed between the inner rubber and the inner liner of the carcass layer or the inner liner of the carcass layer during the vulcanization process of the tire, or the driving of the car, where repeated deformation occurs at high temperature conditions. There was a problem in changing form or physical properties. In addition, in order to couple the rubber components to the tire curker layer, a vulcanizing agent or a vulcanizing process had to be applied, and it was difficult to secure sufficient adhesive force.

Accordingly, various methods have been proposed to reduce fuel consumption by reducing the thickness and weight of the inner liner, and to reduce the shape and physical properties of the inner liner generated during the molding or driving process of the tire. However, any previously known method has had a limit in maintaining excellent air permeability and tire formability while sufficiently reducing the thickness and weight of the innerliner. In addition, the inner liner obtained by the previously known method has a problem in that the properties of the inner liner itself deteriorate in the manufacturing process of the tire in which the high temperature repetitive molding is performed or the repeated process of deformation, There were many problems.

The present invention is to provide a film for a tire innerliner that can exhibit uniform and excellent physical properties in all directions when applied to the tire, and can ensure excellent durability and fatigue resistance even in the tire manufacturing process or automobile driving process.

Moreover, this invention is providing the manufacturing method of the said film for tire innerliners.

In addition, the present invention is to provide a pneumatic tire produced using the film for the tire inner liner.

Moreover, this invention is providing the pneumatic tire manufacturing method using the film for tire innerliner obtained by the manufacturing method of the said film for tire innerliner.

The present invention is a uniaxially stretched base film which is stretched 5% to 50% in a first direction and is in an unstretched state in a second direction perpendicular to the first direction; And an adhesive layer formed on at least one surface of the base film, wherein the first direction is set in parallel with the axial direction of the tire building drum for pneumatic tire manufacturing, and the strong ratio between the first direction and the second direction of the base film is It provides a film for tire innerliner which is 1.1: 1 to 2: 1.

In addition, the present invention comprises the steps of melting and extruding the raw material for the base film to form a base film; Stretching the base film in a transverse direction (TD; 5% to 50%); And forming an adhesive layer on at least one surface of the base film, wherein the strength ratio of the machine film (MD) and the transverse direction (TD) of the base film is 1: 1.1 to 1: 2. Provided are a method for producing an inner liner film.

In addition, the present invention provides a pneumatic tire manufactured using the film for the tire inner liner.

In addition, the present invention is a tire inner liner film obtained by the method for producing a tire inner liner film, the radial direction (TD: Transverse Direction) of the film in the tie when forming the tire radial direction (Radial Direction) width of the tire Direction, and the step of mounting on the tire building drum to be horizontal to the axial direction of the tire building drum.

Hereinafter, a method for manufacturing a tire inner liner film, a method for manufacturing a tire inner liner film, a pneumatic tire, and a pneumatic tire manufacturing method according to a specific embodiment of the present invention will be described in detail.

According to one embodiment of the invention, the stretched 5% to 50% in the first direction, the uniaxially stretched base film in an unstretched state in a second direction perpendicular to the first direction; And an adhesive layer formed on at least one surface of the base film, wherein the first direction is set in parallel with the axial direction of the tire building drum for pneumatic tire manufacturing, and the strong ratio between the first direction and the second direction of the base film is Films for tire innerliners of from 1.1: 1 to 2: 1 may be provided.

 The tire inner liner film produced by stretching 5% to 50% in the transverse direction (TD; Transverse Direction) of the film in the manufacturing process of the base film of the tire inner liner film is a transverse direction (TD; Transverse Direction) of the base film. ) Is applied to the radial direction in the tire, and the machine direction of the base film is applied to the circumferential direction in the tire. When applied to tires and tires, in all directions, in particular, the difference in physical properties and shapes between the radial direction and the circumferential direction of the tire may be insignificant, resulting in uniform and excellent physical properties. Also excellent durability and fatigue resistance can be secured.

In the tire forming and manufacturing process, the inner liner is deformed in various processes such as tire forming and vulcanization by air injection, and in particular, the radial direction and the circumferential direction of the pneumatic tire shown in FIG. Circumferential Direction is particularly large in the degree of deformation. In general, the strain rate in the circumferential direction of the tire is much higher than the radial direction of the tire. As a result, there is a large difference in orientation due to the deformation caused by the tire manufacturing process. It causes uneven physical properties and causes relatively weak physical properties. As the external stress is concentrated in the weak part of such physical properties, phenomena such as damage or destruction of the inner liner may occur, and it may be difficult to secure durability and fatigue resistance required for the tire.

Tire innerliner film according to an embodiment of the present invention is applied to the radial direction of the tire (Radiical Direction), a portion of the orientation or stretching to a certain degree, by applying the unstretched portion in the circumferential direction (Circumferential Direction) The physical properties of the tire innerliner can be solved because the problem of physical property unevenness caused by the unevenness of the alignment caused by the difference in the degree of deformation in the radial direction and the circumferential direction of the tire generated during the tire manufacturing process can be solved. It can be expressed uniformly in all directions, thereby eliminating the fragile parts that can be destroyed by external stress, thereby ensuring the durability and fatigue resistance required for the tire.

The 'unstretched' is a state in which the stretching is not substantially generated in the manufacturing process of the film for the inner liner for the tire, or the orientation is not generated or the shape of the film is not substantially changed in the film produced due to the slight degree of stretching. it means.

The 'first direction' of the base film means a direction parallel to the axial direction of the forming drum when the film for tire innerliner is actually applied and placed (or laminated or wound) on the forming drum for manufacturing a tire, It may be a transverse direction (TD) perpendicular to the direction in which the base film is formed in the process of manufacturing the film for tire innerliner to be described later.

The 'second direction' refers to a direction perpendicular to the first direction, and may be a longitudinal direction (MD; Machine Direction) which is a direction in which a base film is formed in the process of manufacturing the tire innerliner film described later. In tires it is applied in the circumferential direction.

In the previously known tire inner liner film and tire manufacturing process, the base liner film for inner liner surrounds the forming drum in the machine direction (MD), which is the direction in which the film exits the die in the manufacturing direction, or the final state of the roll state. By surrounding the forming drum in the wound direction of the product, the transverse direction of the base film (TD) was placed in parallel with the axis of the forming drum and applied in the radial direction of the tire.

By the way, the film for the tire inner liner as described above may be formed in a certain orientation in the longitudinal direction (MD; Machine Direction) of the base film through the extrusion and coating process. Specifically, if the longitudinal direction (MD; Machine Direction) of the base film is applied to the circumferential direction of the tire when the tire is manufactured using the previous inner liner film of the base film is formed a certain level of orientation Machine direction (MD) is the expansion and deformation occurs at high temperatures during tire production in a state surrounding the forming drum. Depending on such expansion and deformation at high temperatures, crystallization may occur due to excessive orientation in the base film, and thus the film may easily be brittle, and the film may be torn or broken depending on the degree of such orientation. In tires, the difference in physical properties between the circumferential direction and the radial direction is significantly increased, resulting in uneven thickness and physical properties of the inner liner.

In contrast, when the inner liner expands or deforms on a tire forming drum at a high temperature condition, stretching occurs mainly in the circumferential direction of the tire, and stretching does not occur significantly in the radial direction of the tire. In consideration of this, the film for tire innerliner according to the embodiment of the present invention is a tire forming drum for transverse direction (TD; transverse direction) of the film applied in the radial direction of the tire. Since it is 5% to 50% stretched in the first direction parallel to the axial direction of, the problem caused by the difference in the alignment between the circumferential direction and the radial direction occurring in the tire manufacturing process Can be eliminated, uniform thickness and physical properties in all directions within the finished tire, elasticity That did not significantly decrease can be prevented, such as phenomenon that crystals animated or tear in a predetermined direction in the film. That is, the tire inner liner film may secure durability or fatigue resistance required in a tire manufacturing process or a vehicle driving process.

Specifically, the strength ratio of the first direction and the second direction of the base film may be 1.1: 1 to 2: 1, preferably 1.2: 1 to 1.6: 1. The strength ratio between the transverse direction (TD) of the film and the longitudinal direction (MD) of the film depends on the degree of stretching of the transverse direction (TD) of the film. An inner liner having no thickness or physical property difference may be formed, and mechanical properties, durability, and fatigue resistance required in a tire manufacturing process or a vehicle driving process may be secured.

When the base film is applied as a tire inner liner, the first direction of the base film, that is, the transverse direction (TD) of the base film is applied to the radial direction of the tire, and the length of the first direction of the base film. May vary depending on the size of the tire and the forming drum applied, for example, may be 1000 mm or less, preferably 300 mm to 800 mm.

In addition, the second direction of the base film, that is, the machine direction (MD) of the base film is applied to the circumferential direction of the tire, and the length of the second direction also varies depending on the size of the tire and the forming drum. It may be, for example, may be 1000mm or more, preferably 1000mm to 2000mm.

On the other hand, the component of the base film may be used a butyl rubber, synthetic rubber, polyamide-based resin and the like previously known. However, in order for the tire innerliner film to realize excellent airtightness even with a thin thickness, to reduce the weight of the tire, improve automobile fuel efficiency, and have excellent moldability and mechanical properties, the base film may be formed of polyamide-based segments and polyether ( copolymers including poly-ether-based segments; Or a polymer comprising a polyamide based segment and a polymer comprising a polyether based segment.

And, more preferably, the content of the polyether segment of the copolymer or the content of the polymer including the polyether segment is 5 to 50% by weight, or 15 to 15% of the total weight of the base film. 45 wt% Lt; / RTI > .

Since the base film contains a copolymer of the polyamide-based segment and the polyether-based segment, it can be distinguished from the film for the tire innerliner of the past, which is composed of the rubber-based component or the thermoplastic resin component as the main component of the substrate. It may have features that do not require additional vulcanizer.

On the other hand, the characteristic of the film for tire innerliner seems to be due to the use of the base film obtained by including the polyether type segment which provides elastomeric property with the said polyamide type segment in the range. The polyamide-based segment exhibits excellent airtightness due to its inherent molecular chain properties, for example, about 10 to 20 times the airtightness compared to butyl rubber generally used in tires at the same thickness, and not very high modulus compared to other resins. Characteristics.

In addition, the polyether-based segment together with the polyamide-based segment is 5 to 50% by weight, or 15 to 45% by weight based on the total weight of the base film. Since it is used, the film for tire innerliner may have a low modulus property or a relatively small load generated under a specific stretching condition, and the physical properties of the film may not change significantly even after a specific heat treatment process, and the crystallization of polyamide components may be performed. Due to the structural change can be suppressed can be improved durability against tire deformation.

In addition, even when the base film includes a mixture of a polymer including a polyamide-based segment and a polymer including a polyether-based segment, the above-described airtightness and modulus may be exhibited.

Accordingly, the innerliner film may be stretched or deformed to conform to the shape of the tire even when a very small force is applied when the tire is molded, which enables the development of excellent moldability of the tire.

The polyamide-based segment refers to a repeating unit including an amide group (-CONH-), and may be formed from a polyamide-based resin or a precursor thereof that participates in a polymerization reaction.

Since the polyamide-based segment has sufficient heat resistance and chemical stability, it is possible to prevent the innerliner film from being deformed or modified when exposed to high temperature conditions or chemicals such as additives applied during tire manufacturing. In addition, the polyamide-based segment may have a relatively high reactivity with respect to an adhesive (for example, resorcinol-formalin-latex (RFL) -based adhesive) as the polyamide segment is copolymerized with the polyether segment. The adhesive film can be easily adhered to the carcass part.

Specifically, the polyamide-based segment, nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66 copolymers, nylon 6/66/610 copolymer, nylon MXD6 , Nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer, methoxymethylated 6-nylon, methoxymethylated 6-610-nylon and 612-nylon methoxy It may be a main repeating unit included in one polyamide-based resin selected from the group consisting of oxymethylate. For example, the main repeating unit of nylon 6 is known in the formula (1) R ₁ is alkylene having 5 carbon atoms, the main repeating unit of other polyamide-based resin is also known to those skilled in the art.

The polyamide-based segment may include a repeating unit represented by the following formula (1) or (2).

[Formula 1]

In Formula 1, R ₁ may be a straight or branched chain alkylene group having 1 to 20 carbon atoms or a straight or branched chain arylalkylene group having 7 to 20 carbon atoms.

(2)

In Formula 2, R ₂ is a linear or branched alkylene group having 1 to 20 carbon atoms, R ₃ is a straight or branched alkylene group having 1 to 20 carbon atoms or a straight or branched arylalkyl having 7 to 20 carbon atoms. It may be a Rengi.

As used herein, an "alkylene group" means a divalent functional group derived from an alkyl group, and an "arylalkylene group" means a divalent functional group derived from an alkyl group to which an aryl group is introduced. do.

Meanwhile, the polyether segment refers to a repeating unit including an alkyl oxide ('Akyl-O-' group), and may be formed from a polyether resin or a precursor thereof that participates in a polymerization reaction.

The polyether-based segment can suppress the growth of large crystals in the tire innerliner film or prevent the film from being easily broken during the tire manufacturing process or the vehicle driving process. In addition, the polyether-based segment can lower the load generated during the modulus or stretching of the tire inner liner film, and thus can be stretched or deformed to conform to the shape of the tire even when a very small force is applied during tire forming. So that the tire can be easily molded. In addition, the polyether-based segment can suppress the increase in the rigidity of the film at low temperatures and prevent crystallization at high temperatures, and can prevent damage or tearing of the inner liner film due to repeated deformation, etc. By improving the resilience to the deformation of the liner to suppress the occurrence of wrinkles of the film due to permanent deformation it can improve the durability of the tire or innerliner.

The polyether segment may be a main repeating unit that may be included in a polyalkylene glycol resin or a derivative thereof. In this case, the polyalkylene glycol derivative may have an amine group, a carboxyl group, or an isocyanate group at the terminal of the polyalkylene glycol resin. It may be a derivative substituted with, preferably substituted with an amine group. Preferably, the polyether segment is one selected from the group consisting of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyoxyethylene diamine, polyoxypropylene diamine, polyoxytetramethylene diamine, and copolymers thereof. It may be a main repeating unit included in the polyether resin.

Specifically, the polyether segment may include a repeating unit of Formula 5 below.

[Chemical Formula 5]

In Formula 5, R ₅ may be a linear or branched alkylene group having 1 to 10 carbon atoms, n may be an integer of 1 to 100. In addition, R ₆ and R ₇ may be the same as or different from each other, and may be a direct bond, -O-, -NH-, -COO- or -CONH-, respectively.

Meanwhile, the above-described copolymer may include polyamide-based segments and polyether-based segments in a weight ratio of 7: 3 to 3: 7, or 6: 4 to 3: 7. have.

In addition, the mixing weight ratio of the polymer including the polyamide-based segment and the polymer including the polyether-based segment may be 7: 3 to 3: 7 weight, or 6: 4 to 3: 7.

On the other hand, the base film of the tire inner liner film may further include a polyamide-based resin in order to improve mechanical properties or airtightness. Such polyamide-based resin may be present on the film in a mixed state or copolymerized state with the copolymer of the polyamide-based segment and the polyether-based segment described above. As shown in the manufacturing method described below, the polyamide-based resin may be included in the tire innerliner film by being melted and extruded after being mixed with a copolymer of the polyamide-based segment and the polyether-based segment.

The polyamide-based resin that may be further included may be used to improve the mechanical properties of the film for the tire inner liner, for example, heat resistance or chemical stability, and airtightness, but the tire inner liner manufactured when the amount used is too large The characteristic of the film for resin can be reduced. In particular, even when the polyamide-based resin is additionally used, the content of the polyether-based segment in the film should be maintained at 5 to 50% by weight. Accordingly, the polyamide-based resin and the polyamide-based segment And the sum of the amounts of other additives and the like should be 50 to 95% by weight.

The additionally available polyamide-based resin is not particularly limited, and in order to increase the compatibility with the copolymer, it is preferable to use a polyamide-based resin including the same or similar repeating units as the polyamide-based segment. .

The polyamide based resin may have a relative viscosity (96% sulfuric acid solution) of 3.0 to 4.0, preferably 3.2 to 3.7. If the viscosity of the polyamide-based resin is less than 3.0, sufficient elongation may not be secured due to toughness deterioration, and thus damage may occur during tire manufacturing or driving of a vehicle, and the airtightness that the base film layer should have as a film for tire innerliner or It may be difficult to secure physical properties such as moldability. In addition, when the viscosity of the polyamide-based resin is more than 4.0, the modulus or viscosity of the base film layer to be produced may be unnecessarily high, and it may be difficult for the tire innerliner to have proper moldability or elasticity.

The relative viscosity of the polyamide-based resin refers to the relative viscosity measured using a 96% sulfuric acid solution at room temperature. Specifically, a sample of a certain polyamide-based resin (for example, 0.025 g of specimen) is dissolved in 96% sulfuric acid solution at different concentrations to prepare two or more measurement solutions (for example, a polyamide-based resin specimen). Dissolve in 96% sulfuric acid to make concentrations of 0.25 g / dL, 0.10 g / dL, and 0.05 g / dL, and make three measuring solutions), and the relative viscosity of the measuring solution using a viscosity tube at 25 ° C. , The ratio of the average passage time of the measurement solution to the viscosity tube passage time of 96% sulfuric acid solution can be obtained.

Examples of the polyamide based resin include polyamide based resins such as copolymers of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 6/66 / 610 copolymers, nylon MXD6, nylon 6T, nylon 6 / 6T copolymers, nylon 66 / PP copolymers and nylon 66 / PPS copolymers; Or their N-alkoxyalkylates, for example methoxymethylate of 6-nylon, methoxymethylate of 6-610-nylon or methoxymethylate of 612-nylon, nylon 6, nylon 66, nylon Preference is given to using 46, nylon 11, nylon 12, nylon 610 or nylon 612.

In addition, the base film may include the polyamide-based resin and the copolymer or mixture in a weight ratio of 7: 3 to 3: 7, or 6: 4 to 3: 7.

The base film layer may have a thickness of 30 to 300 ㎛, preferably 40 to 250 ㎛, more preferably 40 to 200 ㎛. Accordingly, the film for tire innerliner of one embodiment of the invention has a thinner thickness than previously known, but may have a low air permeability, for example, an oxygen permeability of 200 cc / (m 2 · 24hr · atm) or less. have.

The tire inner liner film may further include an adhesive layer formed on at least one surface of the base film and including a resorcinol-formalin-latex (RFL) adhesive. The adhesive layer including the resorcinol-formalin-latex (RFL) -based adhesive has excellent adhesion and adhesion retention performance to the base film layer and the tire carcass layer, and thus may occur during manufacturing or driving of the tire. By preventing the breakage of the interface between the inner liner film and the carcass layer caused by heat or repeated deformation, the inner liner film can have sufficient fatigue resistance.

The main properties of the adhesive layer described above appear to be due to the inclusion of certain resorcinol-formalin-latex (RFL) based adhesives having a specific composition. Previously, adhesives for tire innerliners have been used, such as rubber type tie gums, and thus require additional vulcanization.

In contrast, the adhesive layer includes a resorcinol-formalin-latex (RFL) -based adhesive having a specific composition, and has high reactivity and adhesion to the base film, and is compressed under high temperature heating conditions without increasing the thickness. The base film and the tire carcass layer may be firmly bonded. Accordingly, it is possible to reduce the weight of the tire and to improve the fuel efficiency of the automobile, and to prevent the phenomenon of separating the carcass layer and the inner liner layer or the base film and the adhesive layer even during repeated deformation in the tire manufacturing process or the automobile driving process. Can be.

In addition, since the adhesive layer may exhibit high fatigue resistance against physical and chemical deformations that may be applied during tire manufacturing or driving, the adhesive force may be applied even during the manufacturing process under high temperature conditions or during the driving of a vehicle in which mechanical deformation is applied for a long time. The degradation of other physical properties can be minimized.

In addition, the resorcinol-formalin-latex (RFL) -based adhesive is capable of crosslinking between latex and rubber, thereby exhibiting adhesive performance. Chemical bonding between the metirol end of the lesosinol-formalin polymer and the base film is possible. Accordingly, when the above-mentioned resorcinol-formalin-latex (RFL) -based adhesive is applied to a base film, a film for a tire innerliner having a sufficient adhesive property and high elastic properties can be provided.

The resorcinol-formalin-latex (RFL) -based adhesive may be 2 to 32% by weight, preferably 10 to 20% by weight and latex 68 to 98% by weight, preferably 80 to 80%, of a condensate of resorcinol and formaldehyde. 90 weight percent.

The condensate of resorcinol and formaldehyde may be obtained by mixing the resorcinol and formaldehyde in a molar ratio of 1: 0.3 to 1: 3.0, preferably 1: 0.5 to 1: 2.5, and then condensation reaction. In addition, the condensate of the resorcinol and formaldehyde may be included in more than 2% by weight relative to the total amount of the adhesive layer in terms of chemical reaction for excellent adhesion, and may be included in less than 32% by weight in order to secure proper fatigue resistance properties. have.

The latex may be one or a mixture of two or more selected from the group consisting of natural rubber latex, styrene / butadiene rubber latex, acrylonitrile / butadiene rubber latex, chloroprene rubber latex, and styrene / butadiene / vinylpyridine rubber latex. The latex may be included in more than 68% by weight relative to the total amount of the adhesive layer for the flexibility of the material and the effective crosslinking reaction with the rubber, it is included in 98% by weight or less for the chemical reaction with the base film and the rigidity of the adhesive layer.

In addition, the adhesive layer may further include one or more additives such as a surface tension modifier, a heat resistant agent, an antifoaming agent, and a filler, together with a condensate and latex of resorcinol and formaldehyde. At this time, the surface tension modifier of the additive is applied for the uniform coating of the adhesive layer, but may cause a problem of the adhesive strength decrease when excessively added, 2 wt% or less or 0.0001 to 2 wt%, preferably based on the total adhesive layer 1.0 wt% or less, or 0.0001 to 0.5 wt%. At this time, the surface tension modifiers sulfonate anionic surfactant, sulfate ester salt anionic surfactant, carboxylate anionic surfactant, phosphate ester salt anionic surfactant, fluorine-based surfactant, silicone-based surfactant and polysiloxane-based surfactant It may be one or more selected from the group consisting of.

The adhesive layer may have a thickness of 0.1 μm to 20 μm, preferably 0.1 μm to 10 μm, more preferably 0.2 μm to 7 μm, even more preferably 0.3 μm to 5 μm, and one of the base films It can be formed on the surface or on both surfaces. If the thickness of the adhesive layer is too thin, the adhesive layer itself may be thinner when the tire is inflated, the crosslinking adhesive force between the carcass layer and the base film may be lowered, and stress may be concentrated on a part of the adhesive layer, thereby reducing fatigue characteristics. In addition, when the adhesive layer is too thick, interfacial separation may occur in the adhesive layer, thereby reducing fatigue characteristics. And, in order to adhere the inner liner film to the carcass layer of the tire, it is common to form an adhesive layer on one surface of the base film, but in the case of applying a multilayer inner liner film or the inner liner film wrapping the bead part, etc. And it is preferable to form an adhesive layer on both sides of the base film when rubber and adhesion on both sides according to the structural design.

On the other hand, according to another embodiment of the invention, melting and extruding the raw material for the base film to form a base film; Stretching the base film in a transverse direction by 5% to 50%; And forming an adhesive layer on at least one surface of the base film, wherein the tire innerliner having a strong ratio of the machine direction (MD) and the transverse direction (MD) of the base film is 1: 1.1 to 1: 2. The manufacturing method of the film for may be provided.

The inventors of the present invention, the tire innerliner film produced by stretching 5% to 50% in the transverse direction (TD; Transverse Direction) of the film in the manufacturing process of the base film, in all directions, especially when applied to the tire manufacturing process and tire The difference in physical properties and shape between the radial direction and the circumferential direction of the tire is insignificant, resulting in uniform and excellent physical properties, and excellent durability and fatigue resistance can be ensured even during tire manufacturing or automobile driving. Experiments confirmed that it can be completed the invention. Specifically, the strength ratio of the transverse direction (TD) and the longitudinal direction (MD) of the base film may be 1.1: 1 to 2: 1, preferably 1.2: 1 to 1.6: 1.

Machine direction (MD) of the base film means a direction in which the base film is formed in the manufacturing process of the film for the tire inner liner, the transverse direction (TD) of the base film is the longitudinal direction It means a vertical direction.

The result of melting and extruding the raw material for the base film may have a width of 500mm or more in the transverse direction.

The stretching of the base film in a transverse direction of 5% to 50% may be performed at 80 ° C to 250 ° C, preferably 100 to 200 ° C.

In addition, the order in which the stretching of the base film by 5% to 50% in the transverse direction and the step of forming an adhesive layer on at least one surface of the base film are not particularly limited. The adhesive layer forming step may be preferred, but the two steps may be performed through a single process or step for easier stretching and processing efficiency.

Stretching the base film in a transverse direction (TD) by 5% to 50% may be simultaneously performed in forming an adhesive layer on the base film, and after the adhesive is coated, a hydraulic or mechanical grip device (Grip) It may include the step of stretching in the transverse direction (TD) of the base film while passing through a heat treatment oven of 80 ℃ to 250 ℃ installed on the track rail.

In addition, the method for producing a tire innerliner film, the step of heat-treating the base film at a temperature of 100 to 180 ℃ before the stretching step; Or after the stretching step may further comprise the step of heat-treating the 5% to 50% stretched base film at a temperature of 100 to 180 ℃.

Specifically, the stretching in the transverse direction (TD) may be made in the entire section in the heat treatment oven, but in terms of stretching uniformity, preferably, the length of the entire heat treatment oven is divided into three sections, and the section for preheating the film in the first section. It is preferable to use, and to continuously stretch the film in the transverse direction in two sections in two sections, and to complete the heat treatment reaction of the shape fixing of the film and the adhesive layer in three sections. At this time, the adhesive coating and the stretching residence time in the heat treatment oven is preferably completed within 3 minutes in consideration of processability and thermal aging of the film, it is also possible to repeat the adhesive layer coating and transverse stretching as necessary.

On the other hand, the raw material for the base film may be a butyl rubber, synthetic rubber, polyamide-based resin and the like previously known. However, in order for the tire innerliner film to realize excellent airtightness even with a thin thickness, to reduce the weight of the tire, improve automobile fuel efficiency, and have excellent moldability and mechanical properties, the base film may be formed of polyamide-based segments and polyether ( copolymer (i) comprising a poly-ether based segment, or a resin mixture (ii) between a polymer comprising a polyamide based segment and a polymer comprising a polyether based segment.

And, more preferably, the content of the polyether segment of the copolymer or the content of the polymer including the polyether segment is 5 to 50% by weight, or 15 to 15% of the total weight of the base film. 45 wt% Lt; / RTI >

Specifically, the forming of the base film may include forming a film having a thickness of 30 μm to 300 μm by melting and extruding the copolymer or mixture described above at 230 to 300 ° C.

Extrusion die for melting and extruding the mixture may be used without any limitation as long as it is known that it can be used for extrusion of a polymer resin, but may be more uniform in thickness of the base film or viscosity through uniformity of residence time in the die. It is preferable to use a T-type die for uniformity of properties.

In the forming of the base film layer, the mixture may be melted and extruded to form a base film having a thickness of 30 to 300 μm. Control of the thickness of the substrate film to be produced can be made by adjusting the extrusion conditions, for example, the extruder discharge amount or the speed of the casting roll (cooling roll).

In addition, in the method for producing a film for tire innerliner, a portion of an extrusion die corresponding to a position at which a non-uniform thickness appears by continuously measuring the thickness of the base film manufactured by the above-described steps, and feeding back a measurement result. For example, the film having a more uniform thickness can be obtained by reducing the deviation of the base film manufactured by adjusting the lip gap adjusting bolt of T-Die. In addition, the adjustment of the thickness measurement-feedback-extrusion die of such films can be configured by using an automated system such as an Auto Die system or the like.

In the step of forming the base film, except for the specific steps and conditions described above, extrusion processing conditions of the film commonly used in the production of the polymer film, for example, screw diameter, screw rotational speed, or line speed, etc. Can be selected and used appropriately.

On the other hand, the method for producing a film for tire innerliner may further comprise the step of solidifying the base film formed by melting and extruding in the cooling unit maintained at a temperature of 5 to 40 ℃, preferably 10 to 30 ℃. have.

The base film layer formed by melting and extruding may be provided on a film having a more uniform thickness by being solidified in a cooling unit maintained at a temperature of 5 to 40 ° C. The substrate film layer obtained by melting and extruding may be grounded or adhered to the cooling unit maintained at the appropriate temperature so that the stretching may not occur substantially, and the substrate film layer may be provided as an unstretched film. In detail, the solidifying step may be performed by using an air knife, an air nozzle, an electrostatic charge device (Pinning device), or a combination thereof, on a cooling roll having the base film layer formed by melting and extruding at a temperature of 5 to 40 ° C. It may include the step of uniformly contact.

In the solidifying step, the base film layer formed by melting and extruding by using an air knife, an air nozzle, an electrostatic pinning device or a combination thereof is brought into close contact with a cooling roll. It is possible to prevent phenomena such as blowing in the air or cooling partially unevenly, so that a film having a more uniform thickness can be formed, and some areas of the film that are relatively thick or thin as compared to the surrounding part are substantially It may not be formed as.

The raw material for the base film may further include a polyamide-based resin, preferably the raw material for the base film is 7: 3 to 3: 7, or 6 to the polyamide-based resin and the copolymer or the resin mixture It may be included in a weight ratio of 4: 4 to 3: 7.

As described above, the copolymer may include a polyamide-based segment and a polyether-based segment in a weight ratio of 7: 3 to 3: 7, or 6: 4 to 3: 7. Can be. The resin mixture may include a polymer including the polyamide-based segment and a polymer including the polyether-based segment in a weight ratio of 7: 3 to 3: 7, or 6: 4 to 3: 7. have.

A copolymer comprising the polyamide resin, the polyamide segment and the polyether segment, or a polymer including the polyamide segment and a polymer including the polyether segment. Details regarding the compounding have been described above.

On the other hand, the tire innerliner film production method, the adhesive layer forming step of applying a resorcinol-formalin-latex (RFL) -based adhesive to a thickness of 0.1 to 20 ㎛ on at least one surface of the base film layer It may further comprise the step.

The forming of the adhesive layer may be performed by coating a resorcinol-formalin-latex (RFL) adhesive on one or both surfaces of the formed base film, and then drying the adhesive layer. May have a thickness of preferably 0.1 to 10 μm. The resorcinol-formalin-latex (RFL) -based adhesive may comprise 2 to 32% by weight of condensate of resorcinol and formaldehyde and 68 to 98% by weight of latex, preferably 80 to 90% by weight. That is, the forming of the adhesive layer may include 2 to 30 wt% of a condensate of resorcinol and formaldehyde on at least one surface of the base film layer; And applying (coating) an adhesive including latex 68 to 98 wt% to a thickness of 0.1 to 20 μm.

More specific information regarding the resorcinol-formalin-latex (RFL) adhesive of the specific composition is as described above.

The coating or coating method or apparatus conventionally used for the application of the adhesive may be used without any limitation, but may be a knife coating method, a bar coating method, a gravure coating method or a spray method, or a dipping method. Can be used. However, it is preferable to use a knife coating method, a gravure coating method, or a bar coating method in terms of uniform application and coating of the adhesive.

After the adhesive layer is formed on one or both surfaces of the base film, the drying and the adhesive reaction may be simultaneously performed, but may be divided into the heat treatment reaction step after the drying step in consideration of the reactive side of the adhesive, and the adhesive layer. In order to apply a thickness or a multi-stage adhesive, the adhesive layer formation and drying and reaction steps may be applied several times. In addition, after the adhesive is applied to the base film, the heat treatment may be performed by solidifying and reacting under heat treatment conditions at about 30 seconds to 3 minutes at 100 to 150 ° C.

On the other hand, according to another embodiment of the invention, there can be provided a pneumatic tire manufactured using the above film for a tire inner liner.

A uniaxially stretched base film stretched 5% to 50% in a first direction and unstretched in a second direction; And an adhesive layer formed on at least one surface of the base film, wherein the first direction is parallel to an axial direction of a tire forming drum for manufacturing pneumatic tires and applied in a radial direction of a tire. When the tire inner liner film having a strong ratio of 1.1: 1 to 2: 1 in the first direction and the second direction of the base film is used, it can exhibit uniform and excellent physical properties in all directions when applied to the tire, and the tire Excellent durability and fatigue resistance can be secured even during the manufacturing process or driving process.

Specifically, the tire inner liner film may not show a large orientation in a certain direction during a tire manufacturing process, and may exhibit uniform thickness and physical properties in all directions in the finished tire, and elasticity does not significantly decrease. As a result, it is possible to prevent a phenomenon such as crystal formation or tearing in a predetermined direction in the film.

In addition, in the film for tire innerliner, the strength of the first direction of the base film applied in the radial direction corresponding to the width direction of the tire and the second direction applied in the circumferential direction of the tire. Since the ratio is 1.1: 1 to 2: 1, preferably 1.2: 1 to 1.6: 1, an inner liner may be formed in the tire to be manufactured without any difference in thickness or physical properties in a specific direction. The mechanical properties, durability and fatigue resistance required in the driving process of the car can be secured.

On the other hand, according to another embodiment of the invention, the tire inner liner film obtained by the above-described method for producing a tire inner liner film in the transverse direction (Transverse Direction) of the base film is horizontal in the width direction of the tire forming drum There may be provided a pneumatic tire manufacturing method comprising the step of raising on a tire building drum.

The pneumatic tire manufacturing method may use any method, condition, and apparatus used in a conventional pneumatic tire manufacturing process without any limitation, except that the release film is removed from the above-described tire manufacturing laminate.

Specifically, the pneumatic tire manufacturing method, the step of laminating a body fly layer on the inner liner film on the tire forming drum; Attaching a bead wire to an end of the body ply layer in a width direction of the forming drum; Forming a belt portion on the tire building drum raised body fly layer; Forming a cap ply on the belt portion; And forming a rubber layer for forming a tread portion, a shoulder portion, and a sidewall portion on the formed belt portion.

According to the present invention, when applied to a tire can exhibit a uniform and excellent physical properties in all directions, and the tire inner liner film and the tire inner liner that can ensure excellent durability and fatigue resistance in the tire manufacturing process or automobile driving process The manufacturing method of the film for pneumatics, the pneumatic tire which apply | coated the said tire inner liner film, and the pneumatic tire manufacturing method using the said tire inner liner film can be provided.

1 schematically shows the structure of a tire.
Fig. 2 shows the radial direction and the circumferential direction in the pneumatic tire.

The invention is explained in more detail in the following examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

[ Example : tire For inner liner  Film and Pneumatic  Manufacture of tires]

< Example 1 >

(1) Production of base film

35% by weight of a nylon 6 resin having a relative viscosity of 96% in sulfuric acid 3.3 and 65% by weight of a copolymer resin having an absolute weight average molecular weight of 145,000 (containing 50% by weight of a polyamide repeating unit and 50% by weight of a polyether repeating unit) And the supplied mixture was extruded at a temperature of 260 DEG C through a T-die (Die Gap - 1.0 mm) having a width of 2000 mm to maintain a uniform molten resin flow. Then, the extruded resultant was cooled and solidified with a film knife having a uniform thickness (average thickness: 100 μm) using an air knife on the surface of a cooling roll controlled at 25 ° C.

(2) application of adhesive and stretching in TD direction

Resorcinol and formaldehyde were mixed in a molar ratio of 1: 2, and then condensation reaction was carried out to obtain a condensate of resorcinol and formaldehyde. 12% by weight of the condensate of resorcinol and formaldehyde and 88% by weight of styrene / butadiene-1,3 / vinylpyridine latex were mixed to obtain a resorcinol-formalin-latex (RFL) adhesive having a concentration of 20%.

Then, this resorcinol-formalin-latex (RFL) -based adhesive was coated on the base film to a thickness of 1 um using a gravure coater.

Subsequent to the coating process, the adhesive-coated base film was stretched in the transverse direction (TD) in a hot air oven including a crawler rail provided with a mechanical grip. Specifically, the hot air oven was composed of three sections, the temperature in the first section is set to 110 ℃, the temperature in the second section is set to 130 ℃, the temperature in the third section is 150 ℃ In the second section of the hot air oven, the base film was stretched 20% in the transverse direction (TD) using a mechanical grip.

And, by adjusting the speed of the wind (Winder) winding the base film coated with the adhesive layer, the time the base film stays in the hot air oven for about 60 seconds to maintain the heat treatment reaction and transverse direction (TD) stretching of the adhesive layer Completed.

< Example 2  >

A film for tire innerliner was prepared in the same manner as in Example 1 except that the processes of (1) and (2) were different.

(1) The temperature in the first section of the hot air oven was set to 100 ° C, the temperature in the second section was set to 130 ° C, and the temperature in the third section was set to 140 ° C. In the second section, the base film was stretched 40% in the transverse direction (TD) using a mechanical grip.

(2) By adjusting the speed of the wind (Winder) winding the base film coated with the adhesive layer, maintaining the time that the base film stays in the hot air oven for about 120 seconds, and the heat treatment reaction and transverse direction (TD) stretching of the adhesive layer Was completed.

< Example 3  >

A film for tire innerliner was prepared in the same manner as in Example 1, except that the processes of (1) to (3) were different.

(1) The die gap [Die Gap] of the T-type die was 0.7 mm.

(2) The temperature in the first section of the hot air oven was set to 120 ° C., the temperature in the second section was set to 120 ° C., and the temperature in the third section was set to 150 ° C. In the first section and the second section, the base film was stretched by 5% in the transverse direction (TD) by using mechanical grips, respectively, to extend the total 10%.

(3) By adjusting the speed of the wind (Winder) winding the base film coated with the adhesive layer, the time the base film stays in the hot air oven for about 120 seconds to maintain the heat treatment reaction and transverse direction (TD) stretching of the adhesive layer Was completed.

< Example 4  >

A film for tire innerliner was prepared in the same manner as in Example 1, except that the processes of (1) to (3) were different.

(1) The die gap [Die Gap] of the T-type die was 0.7 mm.

(2) The temperature in the first section of the hot air oven was set to 110 ° C, the temperature in the second section was set to 130 ° C, and the temperature in the third section was set to 140 ° C. In the first to third sections, the base film was stretched by 5% in the transverse direction (TD) by using mechanical grips, respectively, to extend the total 15%.

(3) By adjusting the speed of the wind (Winder) winding the base film coated with the adhesive layer, maintaining the time that the base film stays in the hot air oven for about 150 seconds, and the heat treatment reaction and transverse direction (TD) stretching of the adhesive layer Was completed.

< Example 5 >

(1) Production of base film

In the same manner as in Example 1, a base film [average thickness: 100 μm] having a uniform thickness was obtained.

(2) application of adhesives and TD In the direction Stretching

One) TD In the direction Stretching

The base film obtained above was stretched in the transverse direction (TD) in the 1st hot-air oven containing the track rail provided with a mechanical grip. The first hot air oven was composed of three sections, the first to third sections were all set to 110 ℃, the second section was stretched 20% in the transverse direction of the base film, stretched in the third section The base film was stabilized. At this time, the time the base film stays in the first hot air oven was maintained at about 30 seconds.

2) Glue application

On the base film obtained in the first stretching step, a resorcinol-formalin-latex (RFL) -based adhesive was coated to a thickness of 1 um using a gravure coater in the same manner as in Example 1.

The heat treatment reaction of the adhesive layer was completed by drying and heat-treating the base film coated with the RFL-based adhesive in a second hot air oven including an endless rail provided with a mechanical grip.

The second hot air oven was composed of three sections, the temperature in the first section was set to 130 ° C, the temperature in the second section was set to 140 ° C, and the temperature in the third section was set to 150 ° C. It was. Then, by adjusting the speed of the wind (Winder) winding the base film coated with the adhesive layer, the base film was maintained in the second hot air oven for about 30 seconds to complete the heat treatment reaction of the adhesive layer.

< Example 6 >

Tire innerliner in the same manner as in Example 1, except that a compound containing 50% by weight of polyamide-based polymer and 50% by weight of polyether-based polymer was used instead of the copolymer resin having an absolute weight average molecular weight of 145,000. The film for manufacture was manufactured.

< Example 7 : Pneumatic  Manufacturing of Tires>

Using the tire innerliner film obtained in Examples 1 to 6, the transverse direction (TD) of the base film is such that the radial direction of the tie is parallel to the axial direction of the tire forming drum. The tire building drum was placed on the tire building drum in the width direction and the horizontal direction.

Then, a body ply layer is laminated on the tire inner liner film, a bead wire is attached to an end of the forming drum width direction of the body ply layer, a belt part is formed on the body ply layer, and the belt part A cap ply part was formed on the rubber layer, and a rubber layer was formed on the formed belt part to manufacture a green tire.

The green tire thus prepared was put in a mold to produce tires of the 205R / 75R15 standard through vulcanization for 160 degrees 30 minutes. At this time, 1300De '/ 2ply HMLS tire cord was used as the cord included in the body fly, steel cord was used as the belt, and N66 840De' / 2ply product was used as the cap fly.

[ Comparative example : tire For inner liner  Preparation of film]

< Comparative Example 1  >

After the adhesive coating in Example 1, the film for tire innerliner was prepared in the same manner as in Example 1 except that the stretching process of the base film in the transverse direction (TD) was omitted.

< Comparative Example 2  >

A film for tire innerliner was prepared in the same manner as in Example 1 except that 60% stretching was performed in the lateral direction of the base film in the second section of the hot air oven.

< Comparative Example 3  >

A film for tire innerliner was prepared in the same manner as in Example 1 except that 3% of stretching was performed in the transverse direction of the base film in the second section of the hot air oven.

< Comparative Example 4 : Pneumatic  Manufacturing of Tires>

The pneumatic tire was manufactured like the manufacturing method of Example 7 using the film for tire innerliners obtained by the said Comparative Examples 1-3.

[ Experimental Example ]

1. Tire Innerliner  Measurement of film properties

(1) Strength ratio measurement in longitudinal direction (MD) and transverse direction (TD) of tire inner liner film

After leaving the tire inner liner films obtained in the above Examples and Comparative Examples for 24 hours at a temperature of 23 ° C. and a relative humidity of 50% for 24 hours, a specimen having a length of 30 mm and a width of 30 mm was prepared.

In the Tensile test machine (Instron, Tensile test machine) to measure the tensile strength of 300mm / min 10 times the strength of the specimen (MD; Machine Direction) and transverse direction (TD), The average value of eight values except the maximum value and the minimum value among the measured values was obtained. The strength ratio was determined by the measured ratios of the strength of the machine direction (MD) and the transverse direction (TD).

(2) tires Innerliner  Oxygen Permeability Experiment of Film

Oxygen permeability of the tire innerliner films obtained in the above Examples and Comparative Examples was measured by using an Oxygen Permeation Analyzer (Model 8000, manufactured by Illinois Instruments) in a 25 ° C., 60 RH% atmosphere by the method of ASTM D 3895.

2. Measurement of tire properties

(1) durability measurement

The durability of the tires obtained in Example 7 and Comparative Example 4 was experimentally evaluated by increasing the load using the FMVSS139 tire durability measurement method. This durability measurement was carried out in two ways: the endurance test to increase the load by the step load method and the high speed test to increase the speed, the measurement result for the tire using the inner liner film of Comparative Example 1 was set to 100, The measurement result about the tire using the innerliner film of Examples 1-6 and Comparative Examples 2-3 was evaluated.

(2) Air pressure holding performance measurement

Tires prepared by applying the tire inner liner films of the above Examples and Comparative Examples were compared and evaluated by measuring the IPR Internal Pressure Retention for 90 days under a pressure of 101.3 kPa at 21 ° C. using ASTM F1112-06. . At this time, it can be recognized that the case where the IPR value is low is high air retention.

(3) tire manufacturing processability

After the final manufacture of the tires obtained in Example 7 and Comparative Example 4, it was checked whether defects, tears, or cracks occurred inside, and evaluated tire manufacturing processability.

In Example 7 and Comparative Example 4, 100 tires were manufactured by applying the innerliner films of Examples 1 to 6 and Comparative Examples 1 to 3, respectively, and the inside of the manufactured tire was visually observed, and defects therein. The yield of the normal product was obtained by checking the number of normal products without any at all.

The results obtained in the above experimental example are shown in Table 1 below.

Heavy rain
(TD / MD) Oxygen permeability cc / (㎡ · 24hr · atm) Durability measurement
Endurance Test (%) Durability measurement
High Speed Test (%) Air pressure holding performance (IPR) [% / 3month] Tire manufacturing processability
(%) Example 1 1.54 76 183 178 2.1 100 Example 2 1.86 63 203 206 1.3 100 Example 3 1.15 93 156 148 2.6 99.7 Example 4 1.31 82 176 178 1.8 100 Example 5 1.72 70 192 193 1.2 100 Example 6 1.55 78 180 170 2.3 100 Comparative Example 1 0.83 103 100 100 15 15.2 Comparative Example 2 2.31 58 38 50 58 25.1 Comparative Example 3 1.02 98 103 102 5.5 33.2

As shown in Table 1, the tire innerliner film of Examples 1 to 6 is confirmed that the ratio of the strength in the transverse direction (TD) to the strength in the longitudinal direction (MD) has a 1.31 to 1.86, such a tire The inner liner film has proper oxygen permeability and air pressure retention performance, and can secure excellent durability when applied to an actual tire, and the tire manufacturing processability is also superior to that of the inner liner film of the comparative example.

On the contrary, when the inner liner fills of Comparative Examples 1 and 3 were used, the difference in the orientation between the circumferential direction and the radial direction of the tire occurred in the tire manufacturing process, resulting in a large thickness of the inner liner film. It was confirmed that tire durability, pneumatic pressure holding performance and manufacturing processability were deteriorated by causing deviation and partial physical property unevenness.

And when the inner liner peel of the comparative example 2 is used, the adhesive layer on a base film will be destroyed at the time of extending | stretching in the lateral direction of a base film, and the adhesive force with a carcass layer will fall, and durability, air pressure holding performance, and tire manufacturing processability will fall significantly. The point was confirmed.

Claims (25)

A uniaxially stretched base film stretched 5% to 50% in a first direction and unstretched in a second direction perpendicular to the first direction; And an adhesive layer formed on at least one surface of the base film.
The first direction is set in parallel with the axial direction of the tire building drum for pneumatic tire production,
The film for tire innerliners whose strong ratio in the 1st direction and the 2nd direction of the said base film is 1.1: 1-2: 1.
The method of claim 1,
A film for tire innerliners in which the first direction is the same as the transverse direction (TD; transverse direction) of the base film, and the second direction is the same as the machine direction (MD) of the base film.
The method of claim 1,
The film for tire innerliners whose length of a said 1st direction of the said base film is 1000 mm or less.
The method of claim 1,
The film for tire innerliner, wherein the base film has a thickness of 30 to 300 ㎛.
The method of claim 1,
A copolymer in which the base film comprises a polyamide segment and a polyether segment; Or a mixture of a polymer comprising a polyamide based segment and a polymer comprising a polyether based segment,
The content of the polyether-based segment of the copolymer or the content of the polymer containing the polyether-based segment is 5 to 50% by weight of the total weight of the base film, the tire innerliner film.
The method of claim 5,
The polyamide-based segment is a film for tire innerliner comprising a repeating unit of the following formula (1) or (2):
[Chemical Formula 1]

In Formula 1, R ₁ is a linear or branched alkylene group having 1 to 20 carbon atoms or a straight or branched arylalkylene group having 7 to 20 carbon atoms,
(2)

In Formula 2, R ₂ is a linear or branched alkylene group having 1 to 20 carbon atoms, R ₃ is a straight or branched alkylene group having 1 to 20 carbon atoms or a straight or branched arylalkyl having 7 to 20 carbon atoms. It's Rengi.
The method of claim 5,
The polyether-based segment is a tire innerliner film comprising a repeating unit of Formula 3 below:
(3)

In Formula 3,
R ₅ is a linear or branched alkylene group having 1 to 10 carbon atoms, n is an integer of 1 to 100,
R ₆ and R ₇ may be the same as or different from each other, and are a direct bond, -O-, -NH-, -COO- or -CONH-, respectively.
The method of claim 5,
The copolymer is a tire innerliner film comprising a polyamide-based segment and a polyether-based segment in a weight ratio of 7: 3 to 3: 7.
The method of claim 5,
A film for tire innerliner having a mixed weight ratio of the polymer including the polyamide-based segment and the polymer including the polyether-based segment is 7: 3 to 3: 7.
The method of claim 5,
The base film is a tire inner liner film further comprises a polyamide-based resin having a relative viscosity (96% solution of sulfuric acid) of 3.0 to 4.0.
The method of claim 10,
The film for tire innerliner, wherein the base film comprises the polyamide-based resin and the copolymer or mixture in a weight ratio of 7: 3 to 3: 7.
The method of claim 1,
The adhesive layer is a tire innerliner film comprising a resorcinol-formalin-latex (RFL) adhesive.
The method of claim 12,
The film for tire innerliner whose thickness of the said contact bonding layer is 0.1-20 micrometers.
Melting and extruding the raw material for the base film to form a base film;
Stretching the base film in a transverse direction by 5% to 50%; And
Forming an adhesive layer on at least one surface of the base film,
The manufacturing method of the film for tire innerliners whose strong ratio of the machine direction (MD) and the transverse direction (MD) of the said base film is 1: 1.1-1: 2.
15. The method of claim 14,
The manufacturing method of the film for tire innerliners which the result of which the said raw material for base films melted and extruded has a length of 500 mm or more in a transverse direction.
15. The method of claim 14,
A method for producing a film for tire innerliner, wherein the stretching of the base film in a transverse direction by 5% to 50% is performed at a temperature of 100 to 180 ° C.
15. The method of claim 14,
Heat-treating the base film at a temperature of 100 to 180 ° C. before the stretching step; or
After the stretching step further comprises the step of heat-treating the 5% to 50% stretched base film at a temperature of 100 to 180 ℃, manufacturing method for a film for tire innerliner.
15. The method of claim 14,
Forming the base film may comprise i) a copolymer comprising the polyamide based segment and a polyether based segment, or ii) a polymer comprising the polyamide segment and a polymer comprising the polyether segment Melting and extruding the raw material for the base film including the resin mixture at 230 to 300 ° C. to form a film having a thickness of 30 μm to 300 μm,
Method for producing a film for tire innerliner, the content of the polyether-based segment of the copolymer or the content of the polymer comprising the poly-ether-based segment is 5 to 50% by weight of the total weight of the base film. .
The method of claim 18,
The raw material for the base film is a method for producing a film for tire innerliner further comprising a polyamide-based resin.
The method of claim 19,
The raw material for the base film is a method for producing a film for tire innerliner comprising the polyamide-based resin and the copolymer or resin mixture in a weight ratio of 7: 3 to 3: 7.
19. The method of claim 18,
The copolymer includes a polyamide-based segment and a polyether-based segment in a weight ratio of 7: 3 to 3: 7,
The resin mixture comprises a polymer comprising the polyamide-based segment and a polymer comprising a polyether-based segment in a weight ratio of 7: 3 to 3: 7, a method for producing a film for tire innerliner.
15. The method of claim 14,
The adhesive layer comprises a resorcinol-formalin-latex (RFL) -based adhesive, the method of producing a film for tire innerliner having a thickness of 0.1 ㎛ to 20 ㎛.
A pneumatic tire manufactured using the film for tire inner liner of claim 1.
A pneumatic tire manufacturing method comprising the step of placing a film for tire innerliner obtained by the manufacturing method of claim 14 on a tire forming drum such that a transverse direction (TD) of the film is parallel to the axial direction of the tire forming drum. .
25. The method of claim 24,
Laminating a body ply layer on the film for inner liner on the tire building drum;
Attaching a bead wire to an end of the body ply layer in a width direction of the forming drum;
Forming a belt portion on the tire building drum raised body fly layer;
Forming a cap ply on the belt portion; And
And forming a rubber layer for forming a tread portion, a shoulder portion, and a sidewall portion on the formed belt portion.

Images