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Pneumatic tire and crosslinked rubber composition

A technology of pneumatic tires and composites, applied in special tires, tire parts, tire treads/tread patterns, etc., can solve the problems of not describing the density, etc., and achieve the effect of excellent wear resistance

Active Publication Date: 2018-07-31
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description in Patent Document 2 of analyzing the density of a sample material or an analysis material in a state to which external energy is applied, such as a stretched state.

Method used

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  • Pneumatic tire and crosslinked rubber composition
  • Pneumatic tire and crosslinked rubber composition
  • Pneumatic tire and crosslinked rubber composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13 and comparative example 1～3

[0158] According to the compounding recipe shown in Tables 1 and 2, the various chemicals shown in Step X were mixed in a 1.7 L Banbury internal mixer at a discharge temperature of 100° C. for 5.0 minutes (Step X). Subsequently, knead the kneaded product obtained in step X and the various chemicals shown in step Y with a 1.7L Banbury internal mixer at a temperature not lower than 140°C for 30 seconds, and Mix for a further 3 minutes at discharge temperature (step Y). Then, the kneaded product obtained in step Y and the various chemicals shown in step F were kneaded at about 80° C. for 3 minutes with an open roll to obtain an unvulcanized rubber composition (step F). The resulting unvulcanized rubber composition is extruded into a tread form using an extruder having a specific shape of an extrusion nozzle, and the extrudate is laminated with other tire components to form an unvulcanized tire, which is then heated at 170°C. Press vulcanization for 12 minutes to produce a test t...

Embodiment 14 to 16

[0174] The chemicals shown in Step X were mixed with a 1.7 L Banbury internal mixer (Step X) according to the compounding recipe and discharge temperature and time shown in Table 3. Subsequently, the kneaded product obtained in step X and the chemicals shown in step Y were kneaded with a 1.7L Banbury mixer at the discharge temperature and time shown in Table 3, and the mixture was mixed at a discharge temperature of 150°C. Mix for a further 3 minutes (step Y). Then, at the discharge temperature and time (step F) shown in Table 3, the kneaded product obtained in step Y and the chemicals shown in step F were kneaded with an open roll to obtain an unvulcanized rubber composition. The resulting unvulcanized rubber composition is extruded into a tread form using an extruder having a specific shape of an extrusion nozzle, and the extrudate is laminated with other tire components to form an unvulcanized tire, which is then heated at 170°C. Press vulcanization for 12 minutes to produ...

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Abstract

The pneumatic tire is characterized by the provision of: bead cores provided to a left-right pair of bead sections; a carcass ply that extends to both bead sections from a crown section through two side wall sections and that is anchored to the bead cores; an inner liner arranged further inward in the radial direction of the tire than the carcass ply; and tread that has a hardness of 65 or more, that is provided further outward in the radial direction of the tire than the carcass ply, in which the volume of a low-density region when stretched at an applied stress of 1.5 MPa is 35% or more, andin which the volume of voids when stretched at an applied stress of 3.0 MPa is 7.5% or less. Also provided is a crosslinked rubber composition that has a hardness of 65 or more, in which the volume of a low-density region when stretched at an applied stress of 1.5 MPa is 35% or more, and in which the volume of voids when stretched at an applied stress of 3.0 MPa is 7.5% or less. The crosslinked rubber composition has excellent wear resistance.

Description

technical field [0001] The present invention relates to pneumatic tires and crosslinked rubber compositions. Background technique [0002] It is known that crosslinked rubber compositions generally used for tire treads have excellent handling stability as their hardness becomes higher (for example, Patent Document 1 and the like). In addition, it is known that as the rigidity of the tread portion of the tire becomes higher, the automobile can turn with a small rudder angle, and thus the lateral force applied to the tread portion decreases, thereby improving the performance of the tire. fracture and abrasion resistance. [0003] However, high hardness does not necessarily lead to excellent fracture resistance and wear resistance, and there are exceptions. In other words, there is sometimes a phenomenon that, although the hardness of the crosslinked rubber composition is high, it is found that good results cannot be obtained by measuring the abrasion resistance of the crossl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00B60C1/00C08L9/00
CPCB60C11/00B60C1/00C08L9/00B60C1/0016B60C2011/0016C08L9/06C08L2205/025C08L2205/03
Inventor 间下亮岸本浩通北乡亮太
Owner SUMITOMO RUBBER IND LTD