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Rubber composition for tire and pneumatic tire made therefrom

A technology of rubber composition and pneumatic tires, which is applied in the direction of special tires, tire parts, microcapsule preparations, etc. It can solve the problems of reducing the viscosity of rubber formula and not generating enough expansion pressure, and achieves the reduction of tire weight, low heat generation, and Effect of reducing rolling resistance

Inactive Publication Date: 2006-05-03
THE YOKOHAMA RUBBER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a technology capable of providing swelling while maintaining desired hardness and viscoelasticity (see Japanese Patent Laid-Open No. 2002-127719A) has not been commercialized
[0005] When using thermally expandable microcapsule formulations, there are the following problems: existing acryloyl-based copolymers (which consist of nitrile-based monomers and (meth)acrylate-based monomers as main components ) thermally expandable microcapsules as a shell cannot generate sufficient expansion pressure in a rubber formulation with a hardness suitable for reinforcing the liner, and in order to obtain sufficient expansion, the viscosity of this rubber formulation has to be reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative Embodiment 1～2

[0028] In each formulation shown in Table I, ingredients other than the vulcanization accelerator, sulfur and heat-expandable microcapsules were mixed in a 1.8L internal mixer for 3 to 5 minutes and discharged when reaching 165±5°C to obtain the matrix material. The masterbatch was mixed with the vulcanization accelerator, sulfur, and heat-expandable microcapsules through an 8-inch open mill to obtain a rubber composition. The rubber composition thus obtained (unvulcanized) was vulcanized by flat pressing at 160° C. for 20 minutes in a mold of 15×15×0.2 cm to prepare expected samples (i.e., rubber sheets), which were then used to evaluate the expansion rate of the vulcanized rubber friction with ice. The results are shown in Table I.

[0029] contrast real

Example 1

contrast real

Example 2

Example 1

Example 2

Formula (parts by weight)

NR *1

BR *2

CB *3

ZnO *4

StA *5

6C *6

Oil *7 ...

Embodiment 3 and comparative Embodiment 3-5

[0047] For each formulation shown in Table II, the same procedure as in the above-mentioned Examples was carried out to obtain rubber compositions. Its physical properties after vulcanization (ie hardness and specific gravity) were measured by the following methods. The results are shown in Table II.

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PUM

PropertyMeasurementUnit
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Abstract

A rubber composition comprising 100 parts by weight of diene rubber and 0.5 to 25 parts by weight of a heat-expandable microcapsule containing a substance enclosed therein capable of being vaporized or expanded by heating to thereby generate gas Thermoplastic resin particles, wherein the shell of the heat-expandable microcapsule is composed of a thermoplastic resin obtained by polymerization of a monomer comprising: a nitrile monomer (I) as a main monomer, having an unsaturated double bond in its molecule A monomer (II) with a carboxyl group, a monomer (III) having two or more polymerizable double bonds, and optionally a copolymerizable monomer (IV) for adjusting swelling characteristics; and a combination of the rubber Pneumatic tires made of materials. The tire has reduced weight and has improved ice traction.

Description

technical field [0001] The present invention relates to a rubber composition, and more particularly to a rubber composition comprising a diene-based rubber having heat-expandable microcapsules mixed therein, which is suitable for use as a pneumatic tire having excellent ice friction, Especially as a tread and bead cover for pneumatic tires and as a reinforcing lining for run-flat tyres. Background technique [0002] It is known in the art that thermoplastic resin particles (hereinafter referred to as "heat-expandable microcapsules") containing substances capable of being vaporized or expanded by heating are mixed into diene-based rubber to obtain (See, eg, Japanese Patent Laid-Open No. 1998-316801A and Japanese Patent Laid-Open No. 1999-035736A). Such thermally expandable microcapsules are already available on the market. [0003] Conventional heat-expandable microcapsules are mainly composed of an acryl-based copolymer as a shell, wherein the copolymer has a nitrile-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00B01J13/14B60C1/00B60C15/06B60C17/00C08J9/32C08L21/00C08L33/02C08L33/18
CPCB60C1/00B60C15/06B60C17/00C08J9/32C08J2321/00C08L21/00C08L33/02C08L33/18C08L2666/04
Inventor 森麻树夫福富崇之城川隆杉山智明武田慎也增田俊明白壁由章
Owner THE YOKOHAMA RUBBER CO LTD