JP2021142847A - tire - Google Patents

Abstract

To provide a tire capable of reducing environmental load and enhancing tire performance.SOLUTION: A tire 1 comprises: a carcass 14 extending in a toroidal shape between a pair of bead parts 11; belt layers 15a and 15b disposed on the tire radial direction outer side of a crown part of the carcass; and a belt reinforcing layer 16 disposed on the tire radial direction outer side of the belt layers. The tire has an organic fiber cord coated by an adhesive composition including polyphenol and aldehyde, and when a tire width direction region where a width in a tire width direction around a tire equator surface CL is 2/3 of a length between ground contact ends is a center region R1, and the tire width direction region between the ground contact ends on the tire width direction outer side from the center region is a shoulder region R2, a tensile elastic modulus of the belt reinforcing layer in the center region is larger than a tensile elastic modulus of the belt reinforcing layer in the shoulder region.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tire.

In recent years, it has been known that an adhesive composition containing no resorcin and formalin can be used in a tire in consideration of the environmental load (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-255153

On the other hand, tires are still required to be further improved in tire performance such as fuel efficiency. Therefore, there is room for further improvement in tire performance even in a tire considering an environmental load as described in Patent Document 1.

An object of the present invention made in view of such circumstances is to provide a tire having a reduced environmental load and improved tire performance.

The tire according to the present invention has a carcass extending in a toroid shape between a pair of bead portions, a belt layer arranged on the tire radial outer side of the crown portion of the carcus, and a tire radial outer side of the belt layer. A tire comprising an arranged belt reinforcing layer, said tire having an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes, centered on the equatorial plane of the tire. The tire width direction region in which the width in the tire width direction is two-thirds of the length between the ground contact ends is defined as the center region, and the tire width direction region between the ground contact ends outside the center region in the tire width direction is defined as the shoulder region. When, the tensile elasticity of the belt reinforcing layer in the center region is larger than the tensile elasticity of the belt reinforcing layer in the shoulder region.
According to such a configuration, it is possible to reduce the environmental load of the tire and improve the tire performance.

In the tire according to the present invention, it is preferable that the winding tension of the belt reinforcing layer in the center region is larger than the winding tension of the belt reinforcing layer in the shoulder region. According to such a configuration, tire performance such as fuel efficiency of the tire can be easily improved.

In the tire according to the present invention, it is preferable that the number of cords driven in the belt reinforcing layer in the center region is larger than the number of cords driven in the belt reinforcing layer in the shoulder region. According to such a configuration, tire performance such as fuel efficiency of the tire can be easily improved.

In the tire according to the present invention, it is preferable that the heat shrinkage rate of the cord of the belt reinforcing layer in the center region is larger than the heat shrinkage rate of the cord of the belt reinforcing layer in the shoulder region. According to such a configuration, tire performance such as fuel efficiency of the tire can be easily improved.

In the tire according to the present invention, the belt reinforcing layer preferably contains the organic fiber cord. According to such a configuration, the environmental load of the tire can be easily reduced.

In the tire according to the present invention, the polyphenols preferably have three or more hydroxyl groups. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the aldehydes are preferably aldehydes having an aromatic ring. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the aldehydes preferably have two or more aldehyde groups. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the total content of the polyphenols and the aldehydes is preferably 3 to 30% by mass. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the adhesive composition preferably contains an isocyanate compound. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the isocyanate compound is preferably a (blocked) isocyanate group-containing aromatic compound. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire can be improved.

In the tire according to the present invention, the adhesive composition preferably contains a rubber latex. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire to the rubber member can be improved.

In the tire according to the present invention, the rubber latex is natural rubber (NR), polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), ethylene-propylene-diene rubber (EPDM). , Chloroprene rubber (CR), butyl halide rubber, acryloni little-butadiene rubber (NBR) and vinylpyridine-styrene-butadiene copolymer rubber (Vp) are preferably at least one selected from the group. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire to the rubber member can be improved.

According to the present invention, it is possible to provide a tire having a reduced environmental load and improved tire performance.

It is a tire width direction sectional view of the tire which concerns on one Embodiment of this invention.

Hereinafter, a tire according to an embodiment of the present invention will be described with reference to the drawings. The same reference numerals are given to common members and parts in each figure.

Hereinafter, unless otherwise specified, the positional relationship of each element shall be measured in a reference state in which the tire is attached to the rim of the wheel, which is the applicable rim, the specified internal pressure is applied, and no load is applied. In addition, the width of the ground contact surface in contact with the road surface in the tire width direction when the tire is attached to the rim of the wheel, which is the applicable rim, is filled with the specified internal pressure, and the maximum load is applied, is called the tire ground contact width. Both ends of the ground contact surface in the tire width direction are referred to as ground contact ends. Hereinafter, the lumen of the tire will be filled with air and will be described as being mounted on a vehicle such as an automobile.

In the present specification, the "applicable rim" is an industrial standard effective in the area where the tire is produced and used. In Japan, JATMA (Japan Automobile Tire Association) JATMA YEAR BOOK, and in Europe, ETRTO (The European). STANDARDS MANUAL of Tire and Rim Technical Organization), YEAR BOOK of TRA (The Tire and Rim Association, Inc.) in the United States, etc. In the case of Measuring Rim, TRA's YEAR BOOK, Design Rim), but in the case of a size not described in these industrial standards, it means a rim with a width corresponding to the bead width of the tire. "Applicable rims" include sizes that may be included in the above-mentioned industrial standards in the future in addition to the current size. As an example of the "size described in the future", the size described as "FUTURE DEVELOPMENTS" in the ETRTO 2013 edition can be mentioned.

In the present specification, the "specified internal pressure" refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size and ply rating described in the above-mentioned industrial standards such as JATMA YEAR BOOK. In the case of a size not described in the above-mentioned industrial standards, it means the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle equipped with tires. Further, in the present specification, the "maximum load" means a load corresponding to the maximum load capacity of a tire of an applicable size described in the above-mentioned industrial standard, or a size not described in the above-mentioned industrial standard. Means the load corresponding to the maximum load capacity specified for each vehicle equipped with tires.

FIG. 1 shows a cross-sectional view in the tire width direction in which the tire 1 according to the embodiment of the present invention is cut along the tire width direction. In the present specification, the tire width direction means a direction parallel to the rotation axis of the tire 1. The tire radial direction means a direction orthogonal to the rotation axis of the tire 1. The tire circumferential direction is the direction in which the tire rotates about the rotation axis of the tire 1. In the present embodiment, the tire 1 will be described as having a configuration symmetrical with respect to the tire equatorial plane CL. However, the tire 1 may be configured to be asymmetric with respect to the tire equatorial plane CL.

In the present specification, the side close to the rotation axis of the tire 1 along the tire radial direction is referred to as "inside in the tire radial direction", and the side far from the rotation axis of the tire 1 along the tire radial direction is referred to as "outside in the tire radial direction". It is called. On the other hand, the side close to the tire equatorial plane CL along the tire width direction is referred to as "inside in the tire width direction", and the side far from the tire equatorial plane CL along the tire width direction is referred to as "outside in the tire width direction".

As shown in FIG. 1, the tire 1 has a pair of bead portions 11, a pair of sidewall portions 12, and a tread portion 13. The sidewall portion 12 extends between the tread portion 13 and the bead portion 11. The sidewall portion 12 is located outside the bead portion 11 in the tire radial direction.

In the present specification, the tread portion 13 has a tread surface that comes into contact with the road surface. Of the ground contact surface of the tread portion 13 of the tread portion 13, the tire width direction region in which the width in the tire width direction is 2/3 of the length between the ground contact ends E is called the center region R1 and is called the center region. Each of the tire width direction regions between the ground contact ends E outside the tire width direction from R1 is referred to as a shoulder region R2.

The pair of bead portions 11 have a bead core 11a and a bead filler 11b, respectively. As shown in a partially enlarged view in FIG. 1, the bead core 11a includes a plurality of bead wires 11c whose perimeter is covered with rubber. In this embodiment, the bead wire 11c is made of, for example, a steel cord. However, the bead wire 11c may be composed of an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes. The details of the adhesive composition and the organic fiber cord used in this embodiment will be described later. The cord forming the bead wire 11c can be formed of, for example, a monofilament or a stranded wire. The bead filler 11b is made of rubber or the like and is located outside the bead core 11a in the tire radial direction. In the present embodiment, the bead filler 11b has a thickness decreasing toward the outer side in the tire radial direction. However, the tire 1 may have a structure in which the bead filler 11b is not provided. The bead portion 11 is configured to be in contact with the rim on the inner side in the tire radial direction and the outer side in the tire width direction when the tire 1 is mounted on the rim.

Tire 1 has a carcass 14. The carcass 14 extends in a toroid shape between a pair of bead portions (bead core 11a in the illustrated example) to form a tire skeleton. The end side of the carcass 14 is locked to the bead core 11a. Specifically, the carcass 14 has a carcass main body portion 14a arranged between the bead cores 11a and a carcass folded portion 14b that is folded around the bead core 11a from the inside in the tire width direction to the outside in the tire width direction. ing. The length of the carcass folding portion 14b can be arbitrary. Further, the carcass 14 may have a structure that does not have the carcass folding portion 14b, or a structure in which the carcass folding portion 14b is wound around the bead core 11a.

The carcass 14 is composed of one or more carcass layers. In the present embodiment, the carcass 14 is composed of one carcass layer, but may be composed of two or more carcass layers laminated in the tire radial direction on the tire equatorial plane CL. As shown partially enlarged in FIG. 1, the carcass layer includes one or more carcass cords 14c and a coated rubber 14r covering the carcass cords 14c. In the present embodiment, the carcass cord 14c is arranged so as to extend in the tire width direction at the tread portion 13. That is, in the present embodiment, the carcass 14 has a radial structure. However, the carcass 14 may have a bias structure.

The carcass cord 14c constituting the carcass layer of the carcass 14 is an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes. The details of the adhesive composition and the organic fiber cord used in this embodiment will be described later. The carcass cord 14c can be formed of, for example, a monofilament or a stranded wire.

The tire 1 has a belt 15 that reinforces the tread portion 13. The belt 15 is arranged on the outer side of the crown region of the carcass 14 in the tire radial direction. In the present embodiment, the belt 15 is provided in the tread portion 13 so as to cover the carcass 14. However, the belt 15 may be provided over the tread portion 13 and a part of the sidewall portion 12.

The belt 15 is composed of one or more belt layers laminated in the tire radial direction on the tire equatorial plane CL. In the present embodiment, the belt 15 is composed of two belt layers 15a and 15b laminated in the tire radial direction on the tire equatorial plane CL. However, the belt 15 may be composed of one layer or three or more belt layers.

As shown in a partially enlarged manner in FIG. 1, each of the belt layers 15a and 15b includes one or more belt cords 15c and a covering rubber 15r covering the belt cords 15c. In the present embodiment, in each of the belt layers 15a and 15b, a plurality of belt cords 15c are arranged so as to form a predetermined angle with respect to the tire circumferential direction. The belt 15 is an intersecting belt in which the belt cord 15c of the belt layer 15a and the belt cord 15c of the belt layer 15b are laminated so as to intersect each other with the tire equatorial plane CL interposed therebetween.

In the present embodiment, the belt cord 15c constituting the belt layers 15a and 15b of the belt 15 is composed of, for example, a steel cord. However, the belt cord 15c may be composed of an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes. The details of the adhesive composition and the organic fiber cord used in this embodiment will be described later. The belt cord 15c can be formed of, for example, a monofilament or a stranded wire.

The tire 1 has one or more belt reinforcing layers 16 that reinforce the belt 15. The belt reinforcing layer 16 is arranged on the outer side of the belt 15 in the tire radial direction. In the present embodiment, the belt reinforcing layer 16 is configured to cover the entire width of the belt 15 in the tire width direction at the tread portion 13. However, the belt reinforcing layer 16 may be provided over the tread portion 13 and a part of the sidewall portion 12. In the illustrated example, the tire width direction end of the belt reinforcing layer 16 is substantially the same as the tire width direction position of the ground contact end E, but it may be inside or outside in the tire width direction. In the present embodiment, the tire 1 has one belt reinforcing layer 16. However, the tire 1 may have two or more belt reinforcing layers 16 laminated in the tire radial direction on the tire equatorial plane CL.

As shown in a partially enlarged manner in FIG. 1, the belt reinforcing layer 16 includes one or more cords 16a and a coated rubber 16r that covers the cords 16a. In the present embodiment, in the belt reinforcing layer 16, a plurality of cords 16a are arranged substantially parallel to the tire circumferential direction.

The cord 16a constituting the belt reinforcing layer 16 is an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes. The details of the adhesive composition and the organic fiber cord used in this embodiment will be described later. The cord 16a can be formed of, for example, a monofilament or a stranded wire.

The tensile elastic modulus of the belt reinforcing layer 16 in the center region R1 is larger than the tensile elastic modulus of the belt reinforcing layer 16 in the shoulder region R2.

In the present embodiment, the tensile elastic modulus E1 of the belt reinforcing layer 16 in the center region R1 is not particularly limited, but is preferably 0.5 to 13 (GPa / mm), for example. The tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2 is not particularly limited, but is preferably 0.3 to 10 (GPa / mm) in a range smaller than the tensile elastic modulus E1. Further, the ratio of the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2 to the tensile elastic modulus E1 of the belt reinforcing layer 16 in the center region R1 (tensile elastic modulus E2 / tensile elastic modulus E1) is arbitrarily less than 1. It may be defined. By reducing the ratio of the tensile elastic modulus E2 to the tensile elastic modulus E1, the fuel efficiency of the tire 1 is improved. On the other hand, by increasing the ratio of the tensile elastic modulus E2 to the tensile elastic modulus E1, the straight running stability and high-speed durability of the tire 1 are improved. From the viewpoint of improving the straight-line stability and high-speed durability of the tire 1 in addition to improving the fuel efficiency of the tire 1, the ratio of the tensile elastic modulus E2 to the tensile elastic modulus E2 is, for example, 1 / 1.1 to 1 /. It is preferably 3 and more preferably 1 / 1.5 to 1 / 2.0.

The tensile elastic modulus of the belt reinforcing layer 16 is measured by, for example, the following method. First, remove the belt reinforcement layer from the unused, brand-new pneumatic tire without damaging the cord. At this time, carefully remove excess rubber adhering to the cord of the belt reinforcing layer with scissors or the like. Further, a tensile load-elongation curve is drawn at room temperature (25 ° C. ± 2 ° C.) at an autograph (Shimadzu Corporation) according to JIS (L1017). The load axis of this load-elongation curve is converted to a value divided by the total number of detexes (dtex) of the code before tension, and rewritten as a stress-elongation curve. Subsequently, a tangent line is drawn at the load point of 7.94 mN / dtex (0.9 g / d) in this curve diagram, and the slope of the tangent line is obtained. The value obtained by multiplying this value (the slope) by (0.981 × the specific gravity of the organic fiber) is the tensile elastic modulus of the cord referred to here.

The elastic modulus of the cords pulled out from an arbitrary location of the belt reinforcing layer 16 in the center region R1 is multiplied by the number of cords existing in the protective layer of the center region R1 and divided by the width of the center region R1. It is defined as the tensile elastic modulus (GPa / mm). Similarly, the elastic modulus of the cord pulled out from an arbitrary place of the belt reinforcing layer 16 in the shoulder region R2 is multiplied by the number of cords existing in the protective layer of the shoulder region R2, and the value divided by the width of the shoulder region R2 is pulled. The elastic modulus is defined as (GPa / mm).

In order to make the tensile elastic modulus of the center region R1 of the belt reinforcing layer 16 larger than the tensile elastic modulus of the shoulder region R2, the belt reinforcing layer 16 may have the following configuration.

For example, the winding tension of the belt reinforcing layer 16 in the center region R1 may be larger than the winding tension of the belt reinforcing layer 16 in the shoulder region R2.

In the present embodiment, the winding tension T1 of the belt reinforcing layer 16 in the center region R1 is not particularly limited, but is preferably 10 to 20 N / cord, for example. The winding tension T2 of the belt reinforcing layer 16 in the shoulder region R2 is not particularly limited, but is preferably 3 to 7 N / cord in a range smaller than the winding tension T1. Further, the ratio of the winding tension T2 of the belt reinforcing layer 16 in the shoulder region R2 to the winding tension T1 of the belt reinforcing layer 16 in the center region R1 (winding tension T2 / winding tension T1) is arbitrarily determined to be less than 1. May be good. Since the winding tension of the belt reinforcing layer 16 is larger in a part or all of the center region R1 than in all or a part of the shoulder region R2, the tensile elasticity of the belt reinforcing layer 16 in the center region R1 is increased. The coefficient E1 can be made larger than the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2.

The winding tension of the belt reinforcing layer 16 is measured, for example, by converting what was measured with a commercially available tension meter into a number per cord.

The number of cords 16a of the belt reinforcing layer 16 in the center region R1 may be larger than the number of cords 16a of the belt reinforcing layer 16 in the shoulder region R2.

In the present embodiment, the number N1 of the cords 16a of the belt reinforcing layer 16 in the center region R1 is not particularly limited, but is preferably 50 to 80/50 mm, for example. The number of driven cords 16a of the belt reinforcing layer 16 in the shoulder region R2 is not particularly limited, but is preferably 25 to 50/50 mm in a range smaller than the number of driven cords N1. Further, the ratio of the number of driven cords 16a of the belt reinforcing layer 16 in the shoulder region R2 to the number of driven cords 16a of the belt reinforcing layer 16 in the center region R1 (number of driven N2 / number of driven N1) is less than 1. It may be arbitrarily determined. The ratio of the number of driving N2 to the number of driving N1 is preferably, for example, 0.5 to 0.9, and more preferably 0.7 to 0.8. In addition, in a part or all of the center area R1, the number of cords 16a of the belt reinforcing layer 16 is larger than that of all or part of the shoulder area R2, so that the belt reinforcing layer 16 in the center area R1 is driven. The tensile elastic modulus E1 of the above can be made larger than the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2.

The heat shrinkage rate of the cord 16a of the belt reinforcing layer 16 in the center region R1 may be larger than the heat shrinkage rate of the cord 16a of the belt reinforcing layer 16 in the shoulder region R2.

In the present embodiment, the heat shrinkage rate H1 of the cord 16a of the belt reinforcing layer 16 in the center region R1 is not particularly limited, but is preferably 3 to 8%, for example. The heat shrinkage rate H2 of the cord 16a of the belt reinforcing layer 16 in the shoulder region R2 is not particularly limited, but is preferably 2 to 5% in a range smaller than the heat shrinkage rate H1. Further, the ratio of the heat shrinkage rate H2 of the cord 16a of the belt reinforcing layer 16 in the shoulder region R2 to the heat shrinkage rate H1 of the cord 16a of the belt reinforcing layer 16 in the center region R1 (heat shrinkage rate H2 / heat shrinkage rate H1) is It may be arbitrarily determined by less than 1. The ratio of the heat shrinkage rate H2 to the heat shrinkage rate H1 is preferably 0.5 to 0.8, for example. In addition, in a part or all of the center region R1, the heat shrinkage rate of the cord 16a of the belt reinforcing layer 16 is larger than that of all or part of the shoulder region R2, so that the belt reinforcing layer in the center region R1. The tensile elastic modulus E1 of 16 can be made larger than the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2.

The heat shrinkage rate of the cord 16a is, for example, the dip reaction of the cord 16a after the dip treatment, in accordance with JIS L1017 (B method), a load of 50 g is applied, and the temperature is 177 ° C. for 2 minutes in the oven. It can be obtained by performing dry heat treatment and measuring the cord length before and after the heat treatment.

The number of layers of the belt reinforcing layer 16 in the center region R1 may be larger than the number of layers of the belt reinforcing layer 16 in the shoulder region R2. In such a case, the number of layers of the belt reinforcing layer 16 in the entire area of the center region R1 may be larger than the number of layers of the belt reinforcing layer 16 in the shoulder region R2, or the belt reinforcing layer may be formed in a part of the center region R1. The number of layers 16 may be larger than the number of layers of the belt reinforcing layer 16 in the shoulder region R2.

The configuration for making the tensile elastic modulus E1 of the belt reinforcing layer 16 in the center region R1 larger than the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2 is not limited to the above-mentioned example. For example, the tensile elastic modulus E1 can be changed by changing at least one of the cord diameter, Young's modulus, material, etc. of the cord 16a of the belt reinforcing layer 16 in the center region R1 and the cord 16a of the belt reinforcing layer 16 in the shoulder region R2. May be larger than the tensile elastic modulus E2. That is, for example, the tensile elastic modulus E1 of the belt reinforcing layer 16 in the center region R1 is shouldered by adjusting at least one of the winding tension, the number of driven pieces, the heat shrinkage rate, the number of layers, the cord diameter, the Young's modulus, and the material. The tensile elastic modulus E2 of the belt reinforcing layer 16 in the region R2 can be made larger. By adjusting these, the tensile elastic modulus in the entire center region R1 can be sufficiently made larger than the tensile elastic modulus in the entire shoulder region R2, so that the end of the belt reinforcing layer 16 in the tire width direction is the ground contact end E. It may be more inside in the tire width direction.

As described above, by making the tensile elastic modulus E1 of the belt reinforcing layer 16 in the center region R1 larger than the tensile elastic modulus E2 of the belt reinforcing layer 16 in the shoulder region R2, the rectangular ratio of the tire 1 when the vehicle is running is increased. (The contact length of the shoulder region R2 / the contact length of the center region R1), and the fuel efficiency of the tire 1 is improved.

The tire 1 has an inner liner 17. The inner liner 17 is arranged so as to cover the inner wall surface of the tire 1. The inner liner 17 may be composed of a plurality of inner liner layers laminated in the tire radial direction on the tire equatorial plane CL. In the present embodiment, the inner liner 17 is made of, for example, a butyl rubber having low air permeability. However, the inner liner 17 is not limited to the butyl rubber, and may be composed of other rubber compositions, resins, or elastomers.

In the above-described configuration of the tire 1, the carcass cord 14c, the belt cord 15c, and the cord 16a of the belt reinforcing layer 16 are described as organic fiber cords coated with an adhesive composition containing polyphenols and aldehydes. bottom. However, the tire 1 is not limited to the above-described configuration, and may have a configuration having the organic fiber cord as any one or more cords of the tire members. For example, the tire 1 may be configured to have the organic fiber cord as at least one of the carcass cord 14c, the belt cord 15c, the cord 16a of the belt reinforcing layer 16, and the cords of other tire members. Even when the above-mentioned organic fiber cord is used as any of the tire members, the environmental load on the tire 1 can be reduced because resorcin is not contained.

(Adhesive composition)
Hereinafter, an adhesive composition coated on a cord such as an organic fiber cord used in the tire 1 according to the present invention will be described. The adhesive composition according to the present invention contains polyphenols and aldehydes. In the tire 1, the adhesive composition for coating the cord used for the carcass 14, the belt 15, the belt reinforcing layer 16, and the like is composed of one containing specific polyphenols and aldehydes, thereby making it environmentally friendly. Good adhesiveness can be achieved even when resorcin is not used in consideration of the load.

(Polyphenols)
The adhesive composition contains polyphenols as a resin component. By including polyphenols in the adhesive composition, the adhesiveness of the resin composition can be enhanced. Here, the polyphenols are water-soluble polyphenols, and are not limited as long as they are polyphenols other than resorcin (resorcinol). In polyphenols, the number of aromatic rings or the number of hydroxyl groups may be appropriately selected.

From the viewpoint of achieving better adhesiveness, polyphenols preferably have two or more hydroxyl groups, and more preferably have three or more hydroxyl groups. By containing three or more hydroxyl groups, the polyphenol or the condensate of the polyphenol is water-soluble in the adhesive composition liquid containing water. As a result, the polyphenols can be uniformly distributed in the adhesive composition, so that more excellent adhesiveness can be realized. Further, when the polyphenols are polyphenols containing a plurality of (two or more) aromatic rings, two or three hydroxyl groups are present at the ortho, meta or para positions in those aromatic rings, respectively.

モリン（２’，４’，３，５，７−ペンタヒドロキシフラボン）：

フロログルシド（２，４，６，３，’５’−ビフェニルペントール）：

Examples of the above-mentioned polyphenols having three or more hydroxyl groups include the following polyphenols.
Phloroglucinol:

Morin (2', 4', 3,5,7-pentahydroxyflavon):

Fluorogluside (2,4,6,3,'5'-biphenylpentol):

(Aldehydes)
The adhesive composition contains aldehydes as a resin component in addition to the above-mentioned polyphenols. By containing aldehydes in the adhesive composition, high adhesiveness can be realized together with the above-mentioned polyphenols. Here, the aldehydes are not particularly limited and may be appropriately selected depending on the required performance. In the present invention, the aldehydes also include derivatives of aldehydes originating from the aldehydes.

Examples of aldehydes include monoaldehydes such as formaldehyde, acetaldehyde, butylaldehyde, achlorine, propionaldehyde, chloral, butylaldehyde, caproaldehyde, and allylaldehyde, or glioxal, malonaldehyde, succinaldehyde, glutaaldehyde, and adipo. Examples thereof include aliphatic dialdehydes such as aldehydes, aldehydes having an aromatic ring, and dialdehyde starch. These aldehydes may be used alone or in combination of two or more.

The aldehydes preferably contain aldehydes having an aromatic ring. This is because better adhesiveness can be obtained. Aldehydes preferably do not contain formaldehyde. In the present invention, the absence of formaldehyde means that, for example, the mass content of formaldehyde based on the total mass of aldehydes is less than 0.5% by mass.

Aldehydes having an aromatic ring are aromatic aldehydes containing at least one aromatic ring and having at least one aldehyde group in one molecule. Aldehydes having an aromatic ring can form a relatively inexpensive resin that has a low impact on the environment and has excellent mechanical strength, electrical insulation, acid resistance, water resistance, heat resistance, and the like. can.

Aldehydes having an aromatic ring preferably have two or more aldehyde groups from the viewpoint of achieving better adhesiveness. By cross-linking and condensing aldehydes with a plurality of aldehyde groups, the degree of cross-linking of the thermosetting resin can be increased, so that the adhesiveness can be further enhanced. Furthermore, when aldehydes have two or more aldehyde groups, it is more preferable that two or more aldehyde groups are present in one aromatic ring. Each aldehyde group can be present at the ortho, meta or para position in one aromatic ring.

Examples of such aldehydes include 1,2-benzenedicarboxardhide, 1,3-benzenedicarboxardhide, 1,4-benzenedicarbaldehyde 1,4-benzenedicarbaldehyde, and 2-hydroxybenzene. Examples thereof include -1,3,5-tricarbaldehyde, and a mixture of these compounds.

Among these, from the viewpoint of achieving better adhesiveness, it is preferable to use at least 1,4-benzenedicarbaldehyde as the aldehydes having an aromatic ring.

（式中、Ｘは、Ｏを含み；Ｒは、−Ｈまたは−ＣＨＯを示す。） Aldehydes having an aromatic ring include not only those having a benzene ring but also heteroaromatic compounds. Examples of aldehydes that are heteroaromatic compounds include aldehydes having a furan ring as shown below.

(In the formula, X comprises O; R represents -H or -CHO.)

（記式中、Ｒは、−Ｈまたは−ＣＨＯ；Ｒ１、Ｒ２及びＲ３は、それぞれ、アルキル、アリール、アリールアルキル、アルキルアリール又はシクロアルキル基を示す。） Examples of the aldehydes having a furan ring include the following compounds.

(In the notation, R stands for -H or -CHO; R1, R2 and R3 represent alkyl, aryl, arylalkyl, alkylaryl or cycloalkyl groups, respectively.)

In the adhesive composition, polyphenols and aldehydes are condensed, and the mass ratio of polyphenols to aldehydes having an aromatic ring (content of aldehydes having an aromatic ring / content of polyphenols) is , 0.1 or more and 3 or less, and more preferably 0.25 or more and 2.5 or less. This is because the hardness and adhesiveness of the resin, which is the product of the condensation reaction occurring between the polyphenols and the aldehydes having an aromatic ring, become more suitable.

The total content of polyphenols and aldehydes having an aromatic ring in the adhesive composition is preferably 3 to 30% by mass, more preferably 5 to 25% by mass. This is because better adhesiveness can be ensured without deteriorating workability and the like. The mass ratio and total content of polyphenols and aldehydes having an aromatic ring are the mass (solid content ratio) of the dried product.

(Isocyanate compound)
The adhesive composition preferably further contains an isocyanate compound in addition to the above-mentioned polyphenols and aldehydes. The synergistic effect with polyphenols and aldehydes can greatly enhance the adhesiveness of the adhesive composition.

Here, the isocyanate compound is a compound having an action of promoting adhesion to a resin material (for example, a phenol / aldehyde resin obtained by condensing polyphenols and aldehydes) which is an adherend of an adhesive composition. It is a compound having an isocyanate group as a polar functional group.

The isocyanate compound is not particularly limited, but is preferably a (blocked) isocyanate group-containing aromatic compound from the viewpoint of further improving the adhesiveness. When the adhesive composition according to the present invention contains an isocyanate compound, (blocked) isocyanate group-containing aromatics are distributed at positions near the interface between the adherend fiber and the adhesive composition, and an adhesion promoting effect is obtained. Be done. Due to this effect, the adhesion of the adhesive composition to the organic cord can be further enhanced.

The (blocked) isocyanate group-containing aromatic compound is an aromatic compound having a (blocked) isocyanate group. "(Blocked) isocyanate group" means a blocked isocyanate group or an isocyanate group, and in addition to the isocyanate group, a blocked isocyanate group generated by reacting with a blocking agent for the isocyanate group, and a blocking agent for the isocyanate group. It contains an unreacted isocyanate group, an isocyanate group generated by dissociating a blocking agent for a blocked isocyanate group, and the like.

Further, the (blocked) isocyanate group-containing aromatic compound preferably contains a molecular structure in which aromatics are bonded by an alkylene chain, and more preferably contains a molecular structure in which aromatics are methylene-bonded. Examples of the molecular structure in which aromatics are bonded by an alkylene chain include a molecular structure found in diphenylmethane diisocyanate, polyphenylene polymethylene polyisocyanate, or a condensate of phenols and formaldehyde.

The (blocked) isocyanate group-containing aromatic compound includes, for example, a compound containing an aromatic polyisocyanate and a heat-dissociable blocking agent, and a component obtained by blocking diphenylmethane diisocyanate or an aromatic polyisocyanate with a heat-dissociable blocking agent. Examples thereof include water-dispersible compounds and aqueous urethane compounds.

Preferable examples of the compound containing an aromatic polyisocyanate and a heat dissociative blocking agent include a blocked isocyanate compound containing diphenylmethane diisocyanate and a known isocyanate blocking agent. Diphenylmethane diisocyanate or polymethylene polyphenyl polyisocyanate is blocked with a known blocking agent that blocks isocyanate groups as an aqueous dispersible compound containing a component obtained by blocking diphenylmethane diisocyanate or aromatic polyisocyanate with a heat dissociable blocking agent. Examples of the reaction product. Specifically, commercially available blocked products such as Elastron BN69 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Erastron BN77 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) or Meicanate TP-10 (manufactured by Meisei Kagaku Kogyo Co., Ltd.) Polyisocyanate compounds can be used.

The aqueous urethane compound includes an organic polyisocyanate compound (α) having a molecular structure in which aromatics are bonded by an alkylene chain, preferably a molecular structure in which aromatics are bonded to methylene, and a compound having a plurality of active hydrogens (β). ) And a heat-dissociable blocking agent (γ) for an isocyanate group. Due to its flexible molecular structure, the aqueous urethane compound (F) not only acts as an adhesive improver, but also acts as a flexible cross-linking agent to suppress the fluidization of the adhesive at high temperatures. "Aqueous" means water-soluble or water-dispersible. "Water-soluble" does not necessarily mean completely water-soluble, but means that it is partially water-soluble or does not phase-separate in the aqueous solution of the adhesive composition of the present invention.

（式中、Ａは芳香族類がアルキレン鎖で結合された分子構造を含有する有機ポリイソシアネート化合物（α）の活性水素が脱離した残基を示し、Ｙはイソシアネート基に対する熱解離性ブロック化剤（γ）の活性水素が脱離した残基を示し、Ｚは化合物（δ）の活性水素が脱離した残基を示し、Ｘは複数の活性水素を有する化合物（β）の活性水素が脱離した残基であり、ｎは２〜４の整数であり、ｐ＋ｍは２〜４の整数（ｍ≧０．２５）である。）で表される水性ウレタン化合物が好ましい。 Here, as the aqueous urethane compound (F), for example, the following general formula (I):

(In the formula, A indicates a residue from which the active hydrogen of the organic polyisocyanate compound (α) containing a molecular structure in which aromatics are bonded by an alkylene chain is eliminated, and Y indicates a thermally dissociable block to the isocyanate group. The active hydrogen of the agent (γ) indicates the desorbed residue, Z indicates the residue of the compound (δ) desorbed, and X indicates the active hydrogen of the compound (β) having a plurality of active hydrogens. An aqueous urethane compound represented by a desorbed residue, n being an integer of 2 to 4 and p + m being an integer of 2 to 4 (m ≧ 0.25) is preferable.

Examples of the organic polyisocyanate compound (α) containing a molecular structure in which aromatics are bonded by an alkylene chain include methylenediphenylpolyisocyanate and polymethylenepolyphenylpolyisocyanate. The compound (β) having a plurality of active hydrogens is preferably a compound having 2 to 4 active hydrogens and having an average molecular weight of 5,000 or less. Such compounds (β) include (i) polyhydric alcohols having 2 to 4 hydroxyl groups, (ii) polyhydric amines having 2 to 4 primary and / or secondary amino groups, (ii). iii) Amino alcohols having 2 to 4 primary and / or secondary amino groups and hydroxyl groups, (iv) Polyester polyols having 2 to 4 hydroxyl groups, (v) 2 to 4 hydroxyl groups Polybutadiene polyols having, and copolymers of them with other vinyl monomers, (vi) polychloroprene polyols having 2 to 4 hydroxyl groups, and copolymers of them with other vinyl monomers, (vii). ) Polyether polyols having 2 to 4 hydroxyl groups, which are alkylene oxide heavy adducts of C2 to C4 of polyhydric amines, polyhydric phenols and amino alcohols, and C2 to C4 of polyhydric alcohols of C3 or higher. Examples thereof include alkylene oxide heavy adducts of C2 to C4, alkylene oxide copolymers of C2 to C4, and alkylene oxide polymers of C3 to C4.

The thermally dissociable blocking agent (γ) for the isocyanate group is a compound capable of liberating the isocyanate group by heat treatment, and examples thereof include known isocyanate blocking agents.

Compound (δ) is a compound having at least one active hydrogen and anionic and / or nonionic hydrophilic groups. Examples of the compound having at least one active hydrogen and an anionic hydrophilic group include aminosulfonic acids such as taurine, N-methyltaurine, N-butyltaurine and sulfanilic acid, and aminocarboxylic acids such as glycine and alanine. Can be mentioned. On the other hand, as a compound having at least one active hydrogen and a nonionic hydrophilic group, for example, compounds having a hydrophilic polyether chain can be mentioned.

The content of the isocyanate compound in the adhesive composition of the present invention is not particularly limited, but is preferably in the range of 5 to 65% by mass, preferably 10 to 65% by mass, from the viewpoint of ensuring more reliable and excellent adhesiveness. It is more preferably 45% by mass. The content of the isocyanate compound is the mass (solid content ratio) of the dried product.

(Rubber latex)
The adhesive composition of the present invention may substantially further contain rubber latex in addition to the polyphenols, aldehydes and isocyanate compounds described above. Thereby, the adhesive composition can further enhance the adhesiveness with the rubber member.

Here, the rubber latex is not particularly limited, and in addition to natural rubber (NR), polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), and ethylene-propylene-diene rubber. Synthetic rubbers such as (EPDM), chloroprene rubber (CR), butyl halide rubber, acryloni little-butadiene rubber (NBR), or vinylpyridine-styrene-butadiene copolymer rubber (Vp) can be mentioned. These rubber components may be used alone or in a blend of a plurality of types.

The rubber latex is preferably mixed with phenols and aldehydes before blending with the isocyanate compound. The content of the rubber latex in the adhesive composition of the present invention is preferably 20 to 70% by mass, more preferably 25 to 60% by mass.

The method for producing the adhesive composition for organic fiber cords is not particularly limited, but for example, a method of mixing and aging raw materials such as polyphenols, aldehydes, and rubber latex, or a method of mixing polyphenols and aldehydes. After aging by mixing with, a method of further adding rubber latex and aging can be mentioned. When the raw material contains an isocyanate compound, the production method may be a method of adding a rubber latex, aging, and then adding the isocyanate compound. The composition and content of the polycyclic aromatic hydrocarbons, aldehydes, rubber latex and isocyanate compound are the same as those described in the above-mentioned adhesive composition of the present invention.

(Organic fiber cord)
The tire 1 according to the present invention has an organic fiber cord coated with an adhesive composition. The organic fiber cord coated with the adhesive composition is adhered to a rubber member such as a coated rubber to form a rubber-organic fiber cord composite. Since the obtained rubber-organic fiber cord composite uses the adhesive composition according to the present invention, the load on the environment is small.

Here, in the tire of the present invention, the rubber-organic fiber cord composite can be used as, for example, a carcass 14, a belt 15, a belt reinforcing layer 16, or the like. Among these, the rubber-organic fiber cord composite is preferably used for the carcass 14 and / or the belt reinforcing layer 16. This is because the organic fiber cord coated with the adhesive composition can reduce the load on the environment and more effectively exhibit the excellent adhesiveness between the organic fiber and the rubber member.

In the rubber-organic fiber cord composite, the adhesive composition may cover at least a part of the organic fiber cord, but from the viewpoint of further improving the adhesiveness between the rubber and the organic fiber cord, the present invention It is preferable that the adhesive composition of the present invention is coated on the entire surface of the organic fiber cord.

The material of the organic fiber cord is not particularly limited and may be appropriately selected depending on the intended use. As the material of the organic fiber cord, for example, an aliphatic polyamide fiber cord such as polyester, 6-nylon, 6,6-nylon, or 4,6-nylon, a polyketone fiber cord, or an aromatic polyamide such as paraphenylene terephthalamide. A synthetic resin fiber material typified by a fiber cord may be used.

The form of the organic fiber cord is not particularly limited, and a monofilament or an organic fiber cord obtained by twisting a plurality of single fiber filaments may be used. In this case, the average diameter of the single fiber filament is preferably 2 μm or more, more preferably 15 μm or more, and preferably 50 μm or less from the viewpoint of providing sufficiently high reinforcing property to the rubber article. .. Further, the organic fiber cord may be in the shape of a bamboo blind.

The organic fiber cord may be a hybrid cord formed by twisting filaments made of two types of organic fibers from the viewpoint of achieving both low-speed and high-temperature steering stability and high-speed durability at a high level.

Further, from the viewpoint of further improving high-speed durability, the hybrid cord preferably has a heat shrinkage stress (cN / dtex) at 177 ° C. of 0.20 cN / dtex or more, preferably 0.25 to 0.40 cN / dtex. It is more preferable that it is within the range.

Further, from the viewpoint of further improving the steering stability at low speed and high temperature, the hybrid cord preferably has a tensile elastic modulus of 60 cN / dtex or less at 1% strain at 25 ° C., particularly 35 to 50 cN / dtex. , The tensile elastic modulus at 3% strain at 25 ° C. is preferably 30 cN / dtex or more, particularly 45 to 70 cN / dtex.

The two types of organic fibers used in the hybrid cord are not particularly limited, but examples of the highly rigid organic fibers include rayon and lyocell, and examples of the organic fibers having a high heat shrinkage rate include polyester, for example, polyethylene. Examples thereof include terephthalate (PET), polyethylene naphthalate (PEN), polytrimethylene terephthalate (PTT), nylon, polyketone (PK) and the like. More preferably, a combination of rayon or lyocell and nylon can be used as the two types of organic fibers used in the hybrid cord.

As a method of adjusting the heat shrinkage stress and the tensile elastic modulus of the hybrid cord using the above-mentioned organic fiber, a method of controlling the tension at the time of dipping treatment can be mentioned. For example, the value of the heat shrinkage stress of the cord can be increased by performing the dip process while applying high tension. That is, although each organic fiber has a unique range of physical characteristics, by controlling the dip treatment conditions, the physical properties can be adjusted within that range to obtain a hybrid cord having desired physical properties.

The organic fiber cord can be formed, for example, with a monofilament or a stranded wire. When the organic fiber cord is a stranded wire, it is preferable that the organic fiber cord is composed of only warp yarns, that is, yarns substantially parallel to the extending direction of the cord. As a result, it is possible to suppress a decrease in fatigue resistance due to the rubbing of the fibers between the warp and the weft, as compared with the case where the organic fiber cord is composed of the warp and the weft.

As described above, the tire 1 according to the embodiment of the present invention is arranged between the carcass 14 extending in a toroid shape between the pair of bead portions 11 and the crown portion of the carcass 14 on the outer side in the tire radial direction. A tire including a belt layer 15a or 15b and a belt reinforcing layer 16 arranged outside the belt layer 15a or 15b in the tire radial direction. The tire 1 has an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes, and the width in the tire width direction around the tire equatorial plane CL is 2 / of the length between the ground contact ends E. When the tire width direction region of No. 3 is the center region R1 and the tire width direction region between the ground contact ends E outside the center region R1 in the tire width direction is the shoulder region R2, the tensile elastic modulus of the belt reinforcing layer 16 in the center region R1. The ratio is characterized by being larger than the tensile elastic modulus of the belt reinforcing layer 16 in the shoulder region R2. According to the tire 1 having such a configuration, the adhesive composition does not contain resorcin and formalin, the environmental load can be reduced, and the tire performance such as fuel efficiency can be improved.

In the tire 1 according to the embodiment of the present invention, the winding tension of the belt reinforcing layer 16 in the center region R1 is preferably larger than the winding tension of the belt reinforcing layer 16 in the shoulder region R2. According to such a configuration, tire performance such as low fuel consumption of tire 1 can be easily improved.

In the tire 1 according to the embodiment of the present invention, the number of driven cords 16a of the belt reinforcing layer 16 in the center region R1 is preferably larger than the number of driven cords 16a of the belt reinforcing layer 16 in the shoulder region R2. According to such a configuration, tire performance such as low fuel consumption of tire 1 can be easily improved.

In the tire 1 according to the embodiment of the present invention, the heat shrinkage rate of the cord 16a of the belt reinforcing layer 16 in the center region R1 is larger than the heat shrinkage rate of the cord 16a of the belt reinforcing layer 16 in the shoulder region R2. preferable. According to such a configuration, tire performance such as low fuel consumption of tire 1 can be easily improved.

In the tire 1 according to the embodiment of the present invention, the belt reinforcing layer 16 preferably contains an organic fiber cord. According to such a configuration, the environmental load of the tire 1 can be easily reduced.

In the tire 1 according to the embodiment of the present invention, the polyphenols preferably have three or more hydroxyl groups. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the aldehydes are preferably aldehydes having an aromatic ring. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the aldehydes preferably have two or more aldehyde groups. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the total content of polyphenols and aldehydes is preferably 3 to 30% by mass. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the adhesive composition preferably contains an isocyanate compound. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the isocyanate compound is preferably a (blocked) isocyanate group-containing aromatic compound. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 can be improved.

In the tire 1 according to the embodiment of the present invention, the adhesive composition preferably contains a rubber latex. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 to the rubber member can be improved.

In the tire 1 according to the embodiment of the present invention, the rubber latex is natural rubber (NR), polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), ethylene-propylene-. At least one selected from the group consisting of diene rubber (EPDM), chloroprene rubber (CR), butyl halide rubber, acryloni little-butadiene rubber (NBR) and vinyl pyridine-styrene-butadiene copolymer rubber (Vp). Is preferable. According to such a configuration, the adhesiveness of the adhesive composition contained in the tire 1 to the rubber member can be improved.

Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present invention. Therefore, it should be noted that these modifications and modifications are within the scope of the present invention. For example, the configurations or functions included in each embodiment or each embodiment can be rearranged so as not to be logically inconsistent. Further, the configurations or functions included in each embodiment can be used in combination with other embodiments or other examples, and a plurality of configurations or functions can be combined into one, divided into one, or one. It is possible to omit the part.

For example, in the present specification, a vehicle is described as being an automobile. However, in addition to automobiles such as passenger cars, trucks, buses, and two-wheeled vehicles, vehicles such as agricultural vehicles such as tractors, construction or construction vehicles such as dump trucks, bicycles, and wheelchairs can be moved by tire 1. It may be any vehicle.

Further, for example, in the present specification, the tire 1 has been described as being filled with air. For example, the tire 1 can be filled with a gas such as nitrogen. Further, for example, the tire 1 can be filled with an arbitrary fluid including not only a gas but also a liquid, a gel-like substance, a powder or granular material, or the like.

Further, for example, in the present specification, the tire 1 has been described as being a tubeless tire provided with an inner liner 17. However, for example, the tire 1 may be a tube type tire including a tube.

Further, for example, although the vulcanization method for the tire 1 is not described in the present specification, the tire 1 vulcanizes an unvulcanized tire by filling a vulcanized bladder with a high-temperature and high-pressure medium such as steam. Or it may be produced by vulcanizing an unvulcanized tire by heating the vulcanization medium in the vulcanization bladder with an electric heater.

1: Tire, 11: Bead part, 11a: Bead core, 11b: Bead filler, 11c: Bead wire, 12: Sidewall part, 13: Tread part, 14: Carcus, 14a: Carcus body part, 14b: Carcus folded part, 14c: Carcass cord, 14r: Coated rubber, 15: Belt, 15a, 15b: Belt layer, 15c: Belt cord, 15r: Coated rubber, 16: Belt reinforcement layer, 16a: Cord, 16r: Coated rubber, 17: Inner liner, CL : Tire equatorial plane, E: Ground edge, R1: Center area, R2: Shoulder area

Claims (13)

A toroid-like carcass extending between a pair of beads,
A belt layer arranged on the outer side of the crown portion of the carcass in the tire radial direction, and
A belt reinforcing layer arranged on the outer side of the belt layer in the tire radial direction,
It is a tire equipped with
The tire has an organic fiber cord coated with an adhesive composition containing polyphenols and aldehydes.
The center region is a region in the tire width direction in which the width in the tire width direction around the equatorial plane of the tire is two-thirds of the length between the ground contact ends, and the tire width direction between the ground contact ends outside the center region in the tire width direction. When the area is the shoulder area,
A tire characterized in that the tensile elastic modulus of the belt reinforcing layer in the center region is larger than the tensile elastic modulus of the belt reinforcing layer in the shoulder region. The tire according to claim 1, wherein the winding tension of the belt reinforcing layer in the center region is larger than the winding tension of the belt reinforcing layer in the shoulder region. The tire according to claim 1 or 2, wherein the number of driven cords of the belt reinforcing layer in the center region is larger than the number of driven cords of the belt reinforcing layer in the shoulder region. The tire according to any one of claims 1 to 3, wherein the heat shrinkage rate of the cord of the belt reinforcing layer in the center region is larger than the heat shrinkage rate of the cord of the belt reinforcing layer in the shoulder region. The tire according to any one of claims 1 to 4, wherein the belt reinforcing layer includes the organic fiber cord. The tire according to any one of claims 1 to 5, wherein the polyphenols have three or more hydroxyl groups. The tire according to any one of claims 1 to 6, wherein the aldehydes are aldehydes having an aromatic ring. The tire according to claim 7, wherein the aldehydes have two or more aldehyde groups. The tire according to any one of claims 1 to 8, wherein the total content of the polyphenols and the aldehydes is 3 to 30% by mass. The tire according to any one of claims 1 to 9, wherein the adhesive composition contains an isocyanate compound. The tire according to claim 10, wherein the isocyanate compound is a (blocked) isocyanate group-containing aromatic compound. The tire according to any one of claims 1 to 11, wherein the adhesive composition contains a rubber latex. The rubber latex includes natural rubber (NR), polyisoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), ethylene-propylene-diene rubber (EPDM), chloroprene rubber (CR), and the like. The tire according to claim 12, which is at least one selected from the group consisting of butyl halide rubber, acryloni little-butadiene rubber (NBR) and vinyl pyridine-styrene-butadiene copolymer rubber (Vp).

Images