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Elastomer Composition, Method for Producing Same, and Pneumatic Tire Using Same

a technology of elastomer composition and composition, which is applied in the direction of tyre parts, vehicle components, special tyres, etc., can solve the problems of thermal plastic resin, limited amount of rubber which could be compounded, and inability to shape, etc., to achieve low gas permeability and high dynamic durability

Inactive Publication Date: 2008-12-25
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an elastomer composition that is flexible and has low temperature durability. This is achieved by dispersing a large amount of elastomer component in a matrix of thermoplastic resin. The elastomer composition can be used for the production of pneumatic tires and other flexible elastic bodies. The method for producing the elastomer composition involves mixing and shaping the thermoplastic resin, elastomer component, and plasticizer in a specific ratio and then removing the plasticizer through evaporation, extraction, or migration. The resulting elastomer composition has the properties of the thermoplastic resin, such as heat resistance, low gas permeability, chemical resistance, and high dynamic durability.

Problems solved by technology

However, when a large amount of rubber is compounded, the thermoplastic resin serving as the continuous phase and the elastomer component serving as the dispersed phase invert in phase, and, therefore, the thermoplastic elastomer composition thus prepared does not exhibit the fluidity of the thermoplastic resin and the shaping becomes impossible.
Therefore, there have been limits to the amount of rubber which could be compounded.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0030]Examples will now be used to further illustrate the present invention, but the present invention is by no means limited in scope by these Examples.

example 8

[0032]In the formulation shown in Table I, the elastomer and the cross-linking agent were mixed in an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare an elastomer composition, which was then pelletized by a rubber pelletizer (Moriyama Manufacturing Co., Ltd.). Into the resin pellets, a plasticizer for resin (butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.) was added to about 30% by weight, based upon the weight of the resin and kneaded by a twin-screw kneader (made by Japan Steel Works), then the plasticizer-containing resin obtained and the elastomer pellets were kneaded again by a twin-screw-type kneader (made by Japan Steel Works) to prepare pellets of a plasticizer-containing elastomer composition, which was (dynamically vulcanized. The pellets prepared were formed into a sheet by a T-die molding machine, which was then dried in a vacuum oven at 180° C. for 30 hours to evaporate off the plasticizer, whe...

example 9

[0033]In the formulation shown in Table I, the elastomer and the cross-linking agent were mixed in an internal-type Banbury mixer (made by Kobe Steel Corporation) at 100° C. for 2 minutes to prepare an elastomer composition, which was the pelletized by a rubber pelletizer (Moriyama Manufacturing Co., Ltd.). Into the resin pellets, a plasticizer for resin (butyl benzene sulfonamide BM-4 made by Daihachi Chemical Industry Co., Ltd.) was added to about 30% by weight, based upon the weight of the resin and kneaded by a twin-screw kneader (made by Japan Steel Works), then the plasticizer-containing resin obtained and the elastomer pellets were kneaded again by a twin-screw kneader (made by Japan Steel Works) to prepare pellets of a plasticizer-containing elastomer composition, which was dynamically vulcanized. The pellets prepared were formed into a sheet by a T-die molding machine, which was then sandwiched between 2 mm sheets of a rubber compound having the following composition and th...

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PUM

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Abstract

An elastomer composition, having an excellent flexibility and low temperature durability, a method for producing the same and a pneumatic tire using the same are provided.An elastomer composition (C) comprising a matrix of a thermoplastic resin (A), in which a dispersed phase of an elastomer component (B) is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component (B) satisfy the following formula (I):Φd / Φm>ηd / ηm  (I)wherein Φd and ηd, respectively, indicate a volume ratio and a melt viscosity of the elastomer component (B), and Φm and ηm, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A)), a method for producing the same and a pneumatic tire using the same.

Description

TECHNICAL FIELD[0001]The present invention relates to an elastomer composition, a method for producing the same and a pneumatic tire using the same. More specifically, it relates to an elastomer composition having an excellent flexibility and low temperature durability, while maintaining the characteristics of the resin, a method for producing the same and a pneumatic tire using the same.BACKGROUND ART[0002]A thermoplastic elastomer composition comprising a matrix (i.e., a continuous phase) of a thermoplastic resin, in which a rubber is finely dispersed (i.e., a dispersed phase) is known. It is known in the art that an island-in-sea structure, in which the rubber is surrounded with the resin, is formed under the conditions satisfying the formula (IV) explained later (e.g., see Japanese Patent Publication (A) No. 2000-159936). To obtain a rubbery elastomer from a composition obtained in a state where a thermoplastic resin forms a matrix, it is necessary to increase the amount of rubb...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60C5/14C08L19/00
CPCB60C1/0008C08J3/005C08K3/22C08K5/0016C08K5/0025C08K5/09C08L2205/22C08L21/00C08L23/22C08L23/283C08L77/00C08L77/02C08L77/06C08L9/00C08L2666/14C08L2666/08C08L2666/04C08L9/06
Inventor HARA, YUICHI
Owner THE YOKOHAMA RUBBER CO LTD
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