JP2012153272A - Laminated rubber, method for manufacturing the same, rubber laminate that uses the laminated rubber, tread that uses the laminated rubber or the rubber laminate, side rubber and tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide laminated rubber that is difficult to receive the limitation of materials and can make the tire satisfy both the rolling resistance and the wear resistance, a method for manufacturing the same, a rubber laminate using the laminated rubber, a tread using the laminated rubber or the rubber laminate, side rubber and the tire.SOLUTION: There is provided a laminated rubber made by laminating three or more rubber layers of thickness 10-500 μm each, and a method for manufacturing the laminated rubber by laminating the rubber layers to three or more, and making the obtained layers into thin layers in the direction laminating the layers to make the thickness of each rubber layer 10-500 μm. There are provided the rubber laminate including a plurality of repeating units assuming a laminated rubber as a repeating unit, the tread containing the laminated rubber or the rubber laminate, and the tire using the laminated rubber or the rubber laminate, or the tire including the tread.

Description

  The present invention applies a pearl shell structure, a laminated rubber capable of achieving both rolling resistance and wear resistance on a tire, a method for producing the same, a rubber laminate using the laminated rubber, and the laminated rubber or With respect to treads, side rubbers, and tires using the rubber laminate, in particular, laminated rubbers that can achieve both rolling resistance and wear resistance in the tire, and can achieve both crack resistance and crack resistance of the side rubber. Further, the present invention relates to a rubber laminate using the laminated rubber, a tread, a side rubber, and a tire using the laminated rubber or the rubber laminated body.

  Biomimetic materials science (Biomimetic Materials Science) has been actively researched to imitate and effectively use biological functions, and is being developed for industrial use. For example, the pearl shell starts with the recognition that it is a sophisticated nanomaterial with suppleness and structural anisotropy made of 0.5 μm calcium carbonate sheet (95%) and several nm protein sheet (5%). Academic and technical fields. This time, we applied a pearl shell structure to laminated rubber, especially tire tread rubber, that is, a micro-thick rubber laminated structure that mimics a pearl shell structure in which micro-sized rubbers with different elastic moduli are integrated (hereinafter, To create a laminated rubber or other structure having an appropriate structure called “rubber pearl shell structure” to achieve both the rolling resistance and wear resistance of the tire and the crack resistance and crack resistance of the side rubber. An attempt was made to develop a possible laminated rubber and a method for producing the same, a rubber laminate using the laminated rubber, and a tread, a side rubber, and a tire using the laminated rubber or the rubber laminate.

  Although there is no conventional technique with a similar idea in particular, as a technique for changing the elastic modulus with a macro-sized thickness, only a tread surface is cured to improve WET performance (see Patent Document 1), a plurality of elastic modulus Tires (see Patent Document 2) arranged with different slopes of rubber (see Patent Document 2), tires with a high elastic modulus in the outermost layer of the tread (see Patent Document 3), and tires with a low tan δ in the outermost layer of the tread (see Patent Document 4) It is disclosed.

JP 2008-7959 A International Publication No. 2008/096786 JP 2007-307776 A JP 2007-280369 A

  However, in the conventional tire technology in which the elastic modulus is changed by the thickness of the macro size, the approach based on the raw material itself is mostly used to achieve both rolling resistance and wear resistance (see Patent Documents 1 to 4). And, due to material limitations, it was difficult to achieve both rolling resistance and wear resistance.

  The present invention has been made in view of the above-described problems, and is a laminated rubber that is not easily restricted by materials and that can achieve both rolling resistance and wear resistance on a tire, a method for producing the same, and a rubber using the laminated rubber It is an object to provide a laminate, and a tread, a side rubber, and a tire using the laminate rubber or the rubber laminate.

  As a result of diligent studies to solve the above-mentioned problems, the present inventors achieve both rolling resistance and wear resistance on a tire by laminating rubber layers having different elastic moduli and different thicknesses (gauges). The present inventors have found that a laminated rubber capable of being obtained is obtained, and have completed the present invention.

  That is, the laminated rubber of the present invention is characterized in that three or more rubber layers having a thickness of 10 μm to 500 μm are stacked.

  The rubber laminate of the present invention is characterized in that the laminated rubber is used as a repeating unit and a plurality of repeating units are included.

  The rubber laminate of the present invention preferably has a plurality of rubber layers having the same elastic modulus among the rubber layers in the laminated rubber, more preferably has a plurality of rubber layers having the same rubber type, and is the lowest. The ratio of the elastic modulus of the elastic rubber layer: the elastic modulus of the most elastic rubber layer is preferably 1: 2 to 1:30.

  In the rubber laminate of the present invention, it is preferable that the rubber layer in the laminated rubber is laminated in the extending direction of the rubber laminated body or in a direction perpendicular to the extending direction.

  In the rubber laminate of the present invention, the rubber layer in the laminated rubber is preferably laminated in a direction perpendicular to the extending direction of the rubber laminate.

  The tread of the present invention preferably includes the laminated rubber or the rubber laminated body, and is preferably composed of the laminated rubber or the rubber laminated body. In the tread, only the rubber laminated body includes the tread. It is more preferable that the whole is constituted.

  The side rubber of the present invention preferably includes the laminated rubber or the rubber laminate.

The tire of the present invention preferably uses the laminated rubber or the rubber laminate, and preferably includes the tread.
In the tire according to the present invention, the lamination direction of the laminated rubber is a tire width direction, the lamination direction of the laminated rubber included in the rubber laminate is the tire width direction, and the lamination direction of the laminated rubber included in the tread. Is preferably the tire width direction, and the lamination direction of the laminated rubber is the tire radial direction, the lamination direction of the laminated rubber of the rubber laminate is the tire radial direction, and the lamination of the tread. The rubber lamination direction is preferably the tire radial direction.

  In the method for producing a laminated rubber according to the present invention, three or more rubber layers are stacked, and the obtained layered rubber is thinned so that the thickness of each rubber layer is 10 μm to 500 μm in the layer stacking direction. It is preferable.

  According to the present invention, a rubber pearl shell structure, that is, a rubber layer having a different elastic modulus and a micro-sized thickness (gauge) is laminated, so that it is not easily restricted by the material. Can be provided, a rubber laminate using the laminated rubber, a tread, a side rubber, and a tire using the laminated rubber or the rubber laminated body.

It is a schematic diagram explaining the effect of the tread using the laminated rubber of this invention. (A) It is a partial expanded sectional view of the formation of an initial stage fracture nucleus of a conventional tread, and a progress field. (B-1) It is a partial expanded sectional view which shows the outline | summary (one aspect that the lamination direction of lamination | stacking rubber | gum is a tire width direction) of the formation suppression of the initial stage fracture nucleus and progress suppression effect of this invention tread. (B-2) It is a partial expanded sectional view which shows the outline | summary (one aspect that the lamination | stacking direction of laminated rubber is a tire radial direction) of the formation suppression effect and progress suppression effect of the initial tread of this invention tread. It is a schematic diagram which shows the one aspect | mode according to the manufacturing method of this invention. It is a schematic diagram explaining the lamination direction of laminated rubber. (A-1) It is a schematic diagram explaining the lamination direction (horizontal direction) of a rectangular parallelepiped laminated rubber. (A-2) It is a schematic diagram explaining the lamination direction (vertical direction) of a rectangular parallelepiped laminated rubber. (B-1) It is a schematic diagram explaining the lamination direction (cylindrical body width direction) of cylindrical body laminated rubber. (B-2) It is a schematic diagram explaining the lamination direction (cylindrical body radial direction) of cylindrical body laminated rubber. It is a figure which shows that the laminated rubber in a side rubber (side wall) was laminated | stacked on the tire width direction (perpendicular | vertical direction with the extending direction of a rubber laminated body). It is a figure which shows that the laminated rubber in a side rubber (side wall) was laminated | stacked on the tire radial direction (extension direction of a rubber laminated body).

Hereinafter, the present invention will be described in detail.
[Laminated rubber]
The laminated rubber of the present invention is characterized in that three or more rubber layers having a thickness of 10 μm to 500 μm are stacked. Laminated rubber with three or more layers of rubber layers with a thickness of 10 μm to 500 μm constitutes a micro-thick rubber pearl shell structure that mimics the pearl shell structure, and has high performance that is not easily restricted by the material. This is because laminated rubber can be created.

(Rubber layer)
The rubber layer of the present invention has a thickness (gauge) of 10 μm to 500 μm. There is no restriction | limiting in particular as a material of a layer. This is because it has processability such as compression malleability and vulcanizability that can be reduced to a thickness (gauge) of 10 μm to 500 μm. Further, as shown in FIG. 1, by adjusting the elastic modulus together with the thickness, the formation of initial fracture nuclei (Y ₁ ) that is greatly involved in wear can be more effectively suppressed, and the rolling resistance can be further reduced.
In order to effectively exhibit the excellent performance and characteristics of the rubber pearl shell structure, it is essential that the rubber layers constituting the rubber layer are co-vulcanized. Here, the co-vulcanization means that the rubber layer has a firm cross-linked bond having a sulfur-sulfur bond of vulcanization.

(Rubber layer thickness)
The thickness of the rubber layer of the present invention means the thickness of the rubber layer in the laminated rubber (thickness of one layer), and is called “gauge” in the technical term of the tire technical field. Normal macro-sized thickness (gauge can be measured with an optical microscope, etc., but the rubber layer of the present invention has a thickness of 10 μm to 500 μm, and is measured using an apparatus capable of measuring a microstructure such as an electron microscope or a scanning probe microscope. It is preferable.
The thickness of the rubber layer of the present invention is 10 μm to 500 μm, more preferably 50 μm to 200 μm. If it is less than 10 μm, it is difficult to form a uniform thickness, and if it exceeds 500 μm, the friction resistance is lowered. This effectively suppresses the formation of initial fracture nuclei (Y ₁ ) that greatly contribute to wear, as shown in FIG. 1, by the thickness (gauge) of the rubber layer thinned to the initial fracture occurrence distance. Because it can.

(Elastic modulus of rubber layer)
The “elastic modulus” of the rubber layer of the present invention is measured using an ordinary stress-strain measuring device while the elastic modulus of the macro structure is measured, while the elastic modulus of a single rubber layer of micro size is measured by micro size. It is measured using a stress-strain measuring device specialized for the above. It is preferable to measure using a device capable of measuring the stress and strain of a microstructure such as a stress-strain measuring device equipped with a microsize measurement attachment or a scanning probe microscope such as an atomic force microscope (AFM).
Among the rubber layers, it is preferable to have a plurality of rubber layers having the same elastic modulus, and it is preferable to have a plurality of rubber layers having the same rubber type.
Furthermore, the ratio of the elastic modulus of the lowest elastic rubber layer to the elastic modulus of the highest elastic rubber layer is more preferably 1: 2 to 1:30. If it is less than 1: 2, the wear resistance is not improved, and if it is more than 1:30, a uniform laminated structure is not formed. Breaking nucleus (Y ₁₎ formation suppressing the destruction nucleus (Y ₁₎ progress is for the effective alleviation of (see FIG. 1 (a)), i.e., the larger of two or more different micro-sized modulus By laminating rubber layers, the progress of fracture nuclei (Y ₁ ) generated on the surface of the laminated rubber or inside the laminated rubber can be relaxed between rubber layers with different elastic moduli, and the development of fracture nuclei (Y ₁ ) is suppressed. (See FIGS. 1 (b-1) and (b-2)), and by laminating micro-sized rubber layers having different elastic moduli, the hysteresis loss of the laminated rubber can be reduced. It is.

(Lamination direction of laminated rubber)
As shown in FIG. 3, the “lamination direction” of the laminated rubber (1) of the present invention refers to the direction in which the rubber layers (3) constituting the laminated rubber (1) are stacked, specifically, the rubber layer. This refers to the direction (AA ′) perpendicular to the layer surface direction (BB ′, CC ′) of (3).
For example, in the rectangular parallelepiped laminated rubber (1) shown in FIG. 3 (a-1), the lamination direction of the laminated rubber (1) is the depth direction (BB ′) and the height direction of the layer surface (2) ( CC ′) is a direction (horizontal direction) indicated by AA ′ perpendicularly. In addition, in the rectangular parallelepiped laminated rubber (1) shown in FIG. 3 (a-2), the laminated rubber (1) is laminated in the depth direction (BB ′) and the horizontal direction (C) of the layer surface (2). -C ') is a direction (vertical direction) indicated by AA' perpendicularly.
FIGS. 3B-1 and 3B-2 show the case where the laminated rubber (1) forms a donut shape or a cylindrical body such as a tire. In FIG.3 (b-1), the lamination | stacking direction of laminated rubber (1) intersects perpendicularly with the depth direction (BB ') and height direction (CC') of a layer surface (2). Is the width direction of the cylindrical body (in the tire, “tire width direction”). Moreover, in FIG.3 (b-2), the lamination | stacking direction of laminated rubber (1) intersects perpendicularly with the circumferential direction (BB ') and width direction (CC') of rubber layer surface (2). It is the radial direction of the cylindrical body indicated by −A ′ (“tire radial direction” in the case of a tire).
The lamination direction (AA ′) of the laminated rubber (1) is preferably the vertical direction or the width direction of the cylindrical body, and “tire width direction” in the tire (FIG. 3 (b-1)). reference). For example, when used in a tire tread, the laminated rubber (1) laminated microscopically mitigates the impact force generated by the push-up of the microprotrusions (X) on the road surface, and the initial fracture nucleus (Y ₁ ) of wear. This is because the formation and progress of the film are effectively suppressed (see FIG. 1B-1). Further, the laminating direction (AA ′) of the laminated rubber (1) is preferably the horizontal direction or the radial direction of the cylindrical body, or “tire radial direction” in the case of the tire (FIG. 3B-b). 2)). For example, when used in a tire tread, the laminated rubber (1) laminated microscopically reduces the impact force generated by the microprotrusions (X) on the road surface, thereby forming the initial fracture nuclei (Y ₁ ) of wear and This is because the progress is effectively suppressed (see FIG. 1B-2).

(Rubber component)
The rubber component used in the laminated rubber of the present invention is not particularly limited, and can include, for example, natural rubber (NR) and synthetic rubber. Specific synthetic rubbers include polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), ethylene-propylene-diene rubber (EPDM), chloroprene rubber (CR), isobutylene isoprene. Examples thereof include rubber (IIR), halogenated butyl rubber, acrylonitrile-butadiene rubber (NBR), and the like. Further, as the rubber component, any of unmodified rubber and modified rubber may be used.

(Combination agent)
The rubber composition used in the laminated rubber or rubber laminate of the present invention contains, in addition to the above rubber components, compounding agents commonly used in the rubber industry, such as fillers, anti-aging agents, softeners, and silane couplings. An agent, stearic acid, zinc white, vulcanization accelerator, vulcanizing agent, and the like can be appropriately selected and blended within a range that does not impair the object of the present invention. As these compounding agents, commercially available products can be suitably used. The rubber composition used in the laminated rubber or rubber laminate of the present invention is produced by blending the rubber component with various compounding agents appropriately selected as necessary, kneading, heating, extruding, etc. Can do.

(Method for producing laminated rubber)
In the method for producing a laminated rubber according to the present invention (see FIG. 2), three or more rubber layers are stacked, and the obtained layered rubber is laminated in the layer stacking direction so that each rubber layer has a thickness of 10 μm to 500 μm. It is preferable to make it thinner.
Further, in a more generalized manufacturing method, the layer stack height of the rubber layer in the x step comprising setting the number of steps repeat end comprising: a natural number, the argument of steps consisting of natural number x, the n _x from a natural number, t rubber layer n _x sheets of thickness in the x step the _x, when a thin layer of the laminated body in the x step consisting of several positive than the alpha _x 1, x-th unit step, the rubber layer N _x layers, the x-th layer stacking process for forming the x-th layer stack having a thickness t _x , and the x-th layer stack is thinned to obtain the x-th laminated rubber having a total thickness of t _x · α _x The x-th layered rubber that has passed the inspection, comprising an x-th thinning step, an x-th confirmation step for inspecting the x-th layered rubber with an electron microscope, and increasing the process argument from x to x + 1 As the starting rubber layer, repeat the x + 1 unit process from the x + 1th lamination process to the x + 1th confirmation process, It is preferable to carry out repeatedly until the number reaches 1 to a.

Specifically, for example, a first layer stacking process in which ten 1 mm thick rubber sheets are stacked to form a 10 mm thick first layer stack, the first layer stack is thinned to a total thickness of 1 mm. A first thinning step for forming a first laminated rubber, a first confirmation step for inspecting the first laminated rubber with an electron microscope, five first laminated rubbers that pass the inspection, and a second layer having a thickness of 5 mm. A second layer stacking step for forming a body, a second layer stacking step for thinning the second layer stack to form a second laminated rubber having a total thickness of 1 mm, and inspecting the second laminated rubber with an electron microscope It is preferable to include a second confirmation step (this is a = 2, n ₁ = 10, t ₁ = 10 mm, α ₁ = 1/10, n ₂ = 5, t ₂ = 5 mm, α ₂ = 1 / 5).
By using the thinning processability (extensibility, compressibility) of the rubber layer, it is possible to suitably manufacture laminated rubber with a rubber layer of a predetermined thickness (gauge) by repeating the layering process and the thinning process. it can.

(Rubber laminate)
The rubber laminate of the present invention is characterized in that the laminated rubber is a repeating unit and a plurality of repeating units are included. By having a plurality of such repeating units, a micro rubber pearl shell structure imitating the pearl shell structure will be constructed more finely, and a high-performance rubber laminate that is not easily restricted by the material can be produced. It is.
Moreover, the manufacturing method of the said rubber laminated body is performed by laminating | stacking and integrating the said some laminated rubber. The layer surface of the laminated rubber is in an unvulcanized state or semi-vulcanized state, and is preferably vulcanized and integrated, and when further incorporated in a tread, a tire or the like, the layer surface is unvulcanized or semi-vulcanized. It is preferable that a plurality of the laminated rubbers in a state are integrated with the layer surface remaining in an unvulcanized state or a semi-vulcanized state.

(Repeated unit of laminated rubber)
The rubber laminate of the present invention preferably includes the above laminated rubber as a repeating unit and a plurality of the repeating units.

(tread)
The tread of the present invention preferably includes the laminated rubber or the rubber laminated body (the laminated body may be a part of the tread), and preferably includes the laminated rubber or the rubber laminated body (the laminated layer). The body may be the whole tread). More preferably, the entire tread is composed of only the rubber laminate. Since the rubber pearl structure described below is employed, when used in a tire, both rolling resistance and wear resistance as a tire can be achieved at a high level.

(Abrasion mechanism)
As shown in FIG. 1 (a), when attention is paid to the wear mechanism of a tire traveling in the vehicle traveling direction Z, particularly its tread (T), input from the road surface by the micro-projections (X) of the road surface and the like. A fracture nucleus (Y ₁ ) is formed on the surface of the receiving tread. As the fracture nuclei (Y ₁ ) progress, the rubber is detached. The wear progresses due to this rubber detachment. According to this wear mechanism, it has been seen that suppressing the formation of initial fracture nuclei (Y ₁ ) is effective in improving wear resistance.

(Performance improvement mechanism by rubber pearl shell structure)
Therefore, as shown in FIGS. 1 (b-1) and (b-2), a rubber pearl shell structure, that is, two or more kinds of rubber layers (2) having greatly different elastic moduli are laminated, and each rubber layer By using laminated rubber (1) with a structure that reduces the thickness (gauge) to the initial fracture occurrence distance, the progress of fracture nuclei (Y ₁ ) generated by the input from the road surface is changed between rubbers with different elastic moduli. It has been found that the development of fracture nuclei (Y ₁ ) can be suppressed and the wear resistance can be effectively improved.
Further, by laminating rubber layers (2) having different elastic moduli, it is possible to reduce the total hysteresis loss of the tread (T) including the laminated rubber, and to reduce the rolling resistance as a tire. I found.

(tire)
The tire of the present invention preferably uses the laminated rubber or the rubber laminated body. This is because rolling resistance and wear resistance as a tire can be achieved at a high level. The tire of the present invention is not particularly limited except that the laminated rubber or the rubber laminated body is used for any of the tire members, and can be produced according to a conventional method. Moreover, it is preferable that the tire of the present invention includes the tread. This is because rolling resistance and wear resistance as a tire can be achieved at a higher level. Moreover, as gas with which this tire is filled, inert gas, such as nitrogen, argon, helium other than normal or the air which adjusted oxygen partial pressure, can be used.
As understood from the above-mentioned wear mechanism, the lamination direction of the laminated rubber or the laminated rubber of the rubber laminate is preferably the tire width direction. In this case, the tire is in contact with the micro projections on the road surface and is microscopic. When subjected to push-up force, the formation of initial fracture nuclei (Y ₁ ) and the development of fracture nuclei (Y ₁ ) are effectively suppressed by the micro rubber pearl shell structure laminated in the tire width direction. (See FIG. 1). Further, the lamination direction of the laminated rubber or the laminated rubber of the rubber laminate is preferably the tire radial direction. In this case, the laminated rubber is laminated in the tire radial direction when the tire is in contact with the micro projections on the road surface. This is because the micro rubber pearl shell structure effectively suppresses the formation of the initial fracture nuclei (Y ₁ ) of wear and the development of fracture nuclei (Y ₁ ) (see FIG. 1). For this reason, the tire can achieve both rolling resistance and wear resistance at a high level.
Further, the side rubber configuration shown in FIG. 4 (lamination in the tire width direction (direction perpendicular to the extending direction of the rubber laminate)) is the side rubber configuration shown in FIG. 5 (tire radial direction (extending direction of the rubber laminate)). It is superior in crack resistance to the laminate of

  Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. .

EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples.
[Examples 1 to 4]

[Production method]
Next, a laminated rubber according to the present invention was manufactured, a tire using the laminated rubber was prototyped, and performance evaluation was performed, which will be described below.
A first laminated body forming step of forming a first laminated body having a thickness of 10 mm or 5 mm by laminating 10 rubber sheets having a thickness of 1 mm or 0.5 mm, a total thickness of 1 mm by thinning the first laminated body Alternatively, a first laminated rubber having a thickness of 0.5 mm (a thickness of one layer is set to 100 μm or 50 μm), and a laminated body forming process and a thinning process using this thinning processability By repeating the above, a laminated rubber having a rubber layer having a predetermined thickness was produced, and a tire of 195 / 65R15 size was produced as a tread rubber having a multilayer structure of the laminated rubber.
Here, for Examples 1 and 2, the stacking direction was the tire width direction, and for Examples 3 and 4, the stacking direction was the tire radial direction.

The specimens of Examples 1 to 4 have a first rubber having an internal loss (tan δ) of 0.47 and a storage elastic modulus (E ′) of 1.91 × 10 ⁷ , and an internal loss (tan δ) of 0. 0.081 and the second rubber having a storage elastic modulus (E ′) of 5.75 × 10 ⁶ is laminated alternately.

[Comparative Example 1]
The test body of Comparative Example 1 has a single-layer structure of the first rubber having an internal loss (tan δ) of 0.47 and a storage elastic modulus (E ′) of 1.91 × 10 ⁷ .

The following items were evaluated for these specimens.

[Evaluation method]
(Dynamic loss factor (tan δ))
Using a viscoelastic spectrometer manufactured by Toyo Seiki Co., Ltd., measuring the dynamic loss factor (tan δ) at room temperature (25 ° C) under the condition of 5% elongation and dynamic strain of 1% and frequency of 52Hz. did.

(Rolling resistance)
In Examples and Comparative Examples in which tires (195 / 65R15) having a tread portion formed based on each rubber composition were produced, a rotating drum having an outer diameter of 1707.6 mm having a steel smooth surface and a width of 350 mm was used, and 4500 N (460 kg). It was measured and evaluated with the lameness when rotated at a speed of 80 km / h under the action of a load of. The larger the measured value, the smaller the rolling resistance (low fuel consumption), and the index was displayed with Comparative Example 1 as 100.

(Abrasion resistance)
In each tire, a Lambone-type friction tester (manufactured by Ueshima Seisakusho Co., Ltd.) was used, and the slip rate was expressed as an amount of wear of 25%, and the measurement temperature was room temperature. The larger the index, the better the wear resistance, and the index was displayed with Comparative Example 1 as 100.

[Inspection method]
(Confirmation of laminated structure by microscope)
The laminated structure was confirmed using a scanning electron microscope (SEM) manufactured by Keyence Corporation.

(Elastic modulus measurement)
Using a viscoelasticity spectrometer (dynamic viscoelasticity measuring machine) manufactured by Toyo Seiki Co., Ltd., the dynamic elastic modulus (E ′) is calculated at room temperature (25 ° C.) under the conditions of dynamic strain 1% and frequency 52 Hz. It was measured.

  From the results shown in Table 1, the test specimens having the rubber pearl shell structure micro-sized rubber laminated structures of Examples 1 to 4 are more resistant to rolling than the conventional specimens having no rubber pearl shell structure. In addition, it can be seen that the wear resistance is greatly improved, and both rolling resistance and wear resistance are compatible.

  Laminated rubber capable of achieving both rolling resistance and wear resistance in a tire by applying a rubber pearl shell structure, a method for producing the same, a rubber laminate using the laminated rubber, and the laminated rubber or the rubber It has become possible to provide a tread and a tire using the laminate.

1. Laminated rubber 2. Rubber layer Layer surface T of rubber layer Tread X Micro protrusion Y Formation area of initial fracture nucleus and its progress area Y ₁ Initial fracture nucleus and its progressed fracture nucleus Z Vehicle traveling direction AA 'Laminating direction of laminated rubber BB' Rubber layer One in the layer surface direction of CC1 One in the layer surface direction of the rubber layer

Claims (16)

  A laminated rubber, wherein three or more rubber layers having a thickness of 10 μm to 500 μm are stacked.   A rubber laminate comprising the laminated rubber according to claim 1 as a repeating unit and a plurality of repeating units.   The rubber laminate according to claim 2, wherein among the rubber layers in the laminated rubber, a plurality of rubber layers having the same elastic modulus are provided.   The rubber laminate according to claim 3, wherein among the rubber layers in the laminated rubber, a plurality of rubber layers having the same rubber type are included.   The ratio of the elastic modulus of the rubber layer having the lowest elasticity to the elastic modulus of the rubber layer having the highest elasticity among the rubber layers in the laminated rubber is 1: 2 to 1:30. 5. The rubber laminate according to any one of 4 above.   The rubber laminate according to any one of claims 2 to 5, wherein a rubber layer in the laminated rubber is laminated in an extending direction of the rubber laminate or a direction perpendicular to the extending direction.   The rubber laminate according to claim 6, wherein the rubber layer in the laminated rubber is laminated in a direction perpendicular to an extending direction of the rubber laminate.   A tread comprising the laminated rubber according to claim 1 or the rubber laminate according to any one of claims 2 to 7.   A tread comprising the laminated rubber according to claim 1 or the rubber laminate according to any one of claims 2 to 7.   9. The tread according to claim 8, wherein the entire tread is composed of only the rubber laminate according to claim 2.   A side rubber comprising the laminated rubber according to claim 1 or the rubber laminate according to any one of claims 2 to 7.   A tire comprising the laminated rubber according to claim 1 or the rubber laminate according to any one of claims 2 to 7.   A tire comprising the tread according to claim 8.   The lamination direction of the laminated rubber according to claim 1 is a tire width direction, and the lamination direction of the laminated rubber of the rubber laminate according to any one of claims 2 to 7 is a tire width direction. The tire according to claim 12 or 13, wherein the lamination direction of the laminated rubber which the tread according to any of 8 to 10 has is a tire width direction.   The lamination direction of the laminated rubber according to claim 1 is a tire radial direction, and the lamination direction of the laminated rubber of the rubber laminate according to any one of claims 2 to 7 is a tire radial direction. 14. The tire according to claim 12, wherein a lamination direction of the laminated rubber included in the tread according to any one of 8 to 10 is a tire radial direction. Three or more rubber layers are stacked,
A method for producing a laminated rubber, wherein the obtained layered rubber is thinned so that the thickness of each rubber layer is 10 μm to 500 μm in the layer stacking direction.

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