Rubber composition for tire and tire using the same

A rubber composition and tire technology, applied to special tires, tire parts, tire edges, etc., can solve the problems of increased tire weight, non-disclosure, and deterioration of operational responsiveness, and achieve excellent crack growth resistance and separation resistance Excellent performance and excellent durability

Inactive Publication Date: 2012-10-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the insulating rubber layer has the same formulation as the ply, it does not have sufficient elongation at break (EB%), durability, adhesion, and rubber hardness. Up to one bead, there are problems such as increase in tire weight and deterioration of handling responsiveness
[0009] Patent Document 1 discloses a pneumatic tire that can improve driving stability while suppressing a rise in resonance frequency in the circumferential direction and deterioration of road noise by making the front end of the bead apex into a thin-plate wing. Research on prevention of separation between bead apex and ply
[0010] Although Patent Document 2 discloses a rubber composition used as a topping for covering carcass cords, and Patent Document 3 discloses a rubber composition used as a breaker / interply strip layer, there is no disclosure of a combination of Patent Document 2 and The rubber composition described in 3 is suitable for the bead apex / interply rubber layer

Method used

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  • Rubber composition for tire and tire using the same
  • Rubber composition for tire and tire using the same
  • Rubber composition for tire and tire using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～22 and comparative example 1～14

[0170] In the formulation content shown in Table 1 and Table 2, various chemicals except insoluble sulfur and vulcanization accelerator were kneaded with a Banbury mixer. The resulting kneaded product was discharged at 180°C, to which insoluble sulfur and a vulcanization accelerator were added, kneaded in an open roll, and discharged at 105°C, whereby an unvulcanized rubber composition was obtained. Test pieces were prepared by vulcanizing the unvulcanized rubber composition at 170° C. for 12 minutes, and the following tests were performed using the obtained test pieces. Furthermore, the above-mentioned unvulcanized rubber composition was molded with a single rubber extruder into image 3 The shape of the apex strip shown (average thickness: 1.0mm, h1: 60, h2: 15 for the apex strip 13, h1: 60, h2: 15 for the apex strip 14) should be attached to other tire components Combined into an unvulcanized tire, press vulcanized at 150° C. for 35 minutes to manufacture test tires (size:...

Embodiment 23 and 24

[0172] In order to make the unvulcanized rubber composition Figure 5 (Example 23) and Figure 9 The bead apex of the two-layer structure shown in (Example 24) was produced in the same manner as in the above-mentioned Example 1, except that the unvulcanized rubber composition of the bead apex formulation was molded with a double-two-layer extruder. The test tires were subjected to the tests shown below.

[0173]

[0174] The prepared test piece was cut into width 4mm, length 40mm, and thickness 2mm, and measured the complex modulus of elasticity (E * ) and loss tangent (tanδ) viscoelastic properties. The measurement conditions were: initial strain 10%, dynamic strain 2%, vibration frequency 10 Hz, temperature 70°C. E. * The value of α is 4 to 8 MPa, showing excellent driving stability and separation resistance (strain dispersibility). In addition, the smaller the value of tan δ, the better the low heat build-up property.

[0175]

[0176] According to JIS K6251, a tens...

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Abstract

The invention provides a rubber composition which will not reduce driving stability and operation responsiveness, and can improve separability-resistant performance. The rubber composition is used for tire bead triangle rubber or a rubber layer between tire cord layers. The invention also provides a tire using the rubber composition. With respect to 100 parts by weight of diene series rubber component, the rubber composition also includes (A) 1.5-2.9 parts by weight of sulphur, (B) 1-4 parts by weight of at least one of modified resorcinol resin, cresol resin and modified cresol resin, (C) 0.7-3 parts by weight of partial condensation compound of hexamethylol melamine five methyl ether or partial condensation compound of hexa-methoxyl hydroxymethyl melamine, (D) 5-30 parts by weight of silicon dioxide, and (E) 10-55 parts by weight of carbon black whose nitrogen adsorption ratio surface area is 38-125m2/g.

Description

technical field [0001] The present invention relates to a rubber composition for a rubber layer provided between a bead apex and a ply, and a tire having a rubber layer using the rubber composition. Background technique [0002] In recent years, there has been an increasing demand for technology that can reduce the size and weight of tires used in passenger car tires for heavy electric vehicles, hybrid vehicles, and fuel cell vehicles. One of the causes of the decrease in tire durability can be exemplified by the separation of the bead apex and the carcass. The cause of the separation can be, for example, a phenomenon in which strain (distortion) generated along with deformation of the bead portion due to running is concentrated at a specific position (strain concentration), resulting in the phenomenon that the strain concentration and subsequent The resulting heat is prone to separation at specific locations. The position where separation is likely to occur can be exempli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/00C08L9/06C08L15/00C08L61/14C08L61/08C08K13/02C08K3/06C08K5/3492C08K3/36C08K3/04B60C1/00B60C15/06
CPCB60C15/0603C08K3/04C08K3/06C08K3/36C08K5/34922C08K2201/006C08L7/00C08L9/00C08L9/06C08L61/06C08L61/14
Inventor 宫崎达也
Owner SUMITOMO RUBBER IND LTD
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