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Elastomer reinforcement cord

An elastomer and cord technology, applied in the reinforcement layer, transportation and packaging, coating and other directions of pneumatic tires, can solve the problem of steel cord rust and other problems, and achieve the effect of improving durability

Inactive Publication Date: 2021-06-15
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such steel cords, for example, when the tire suffers trauma and damages that reach the steel cords occur, water or the like in the external environment may infiltrate into the gaps between the steel wires constituting the steel cords and cause the steel cords to rust

Method used

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  • Elastomer reinforcement cord
  • Elastomer reinforcement cord
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] The present invention will now be illustrated in more detail by way of examples.

[0058] An unvulcanized cord having a (3+9) structure in the steel part was made by twisting a steel wire having a diameter of 0.34 mm and a resin wire. The resin yarn is obtained by mixing HIMILAN 1702 (manufactured by Dow-Mitsui Polychemicals Co., Ltd.) as an ionomer and TUFTEC M1943 (manufactured by Asahi Kasei Co., Ltd.) as a maleic anhydride-modified SEBS at a ratio of 8:2 Made of polymer material (softening point: 95°C). This polymer material has a durometer hardness of 70 specified in JIS K 6253 (2012) at 50°C. By changing the diameter of the resin filaments to be used and thereby changing the filling rate of the polymer material, unvulcanized cords having various filling rates are obtained.

[0059] The unvulcanized cords thus obtained were each coated with a coating rubber to produce cord-rubber composites, and these composites were vulcanized at 145° C. for 40 minute. In the ...

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Abstract

Provided is an elastomer reinforcement cord for which the problem of stress concentration at an interface between an elastomer and a metal cord has been resolved to improve durability. The elastomer reinforcement cord comprises metal filaments (1a and 1b) and a polymer material 3 having a melting point or softening point of 80 DEG C or more and 160 DEG C or less. Where a region outside the metal filaments within a region that has a core (11) and at least one sheath layer (12) and is surrounded by lines connecting the centers of the metal filaments constituting the outermost sheath layer in a cross section in the direction orthogonal to the axial direction after vulcanization is taken as a gap region, the gap region includes the polymer material, and the filling ratio, which is the proportion of the area of the polymer material, is more than 120% where the area of the gap region is 100%.

Description

technical field [0001] The present invention relates to an elastomer-reinforced cord (hereinafter, also simply referred to as "cord"). More specifically, the present invention relates to elastomeric reinforcing cords that can be preferably used as reinforcing materials for elastomeric articles such as tyres. Background technique [0002] Traditionally, steel cords obtained by twisting steel wires together have been used as reinforcement in the belts of tires. However, in such steel cords, for example, when the tire suffers trauma and damages that reach the steel cords occur, water or the like in the external environment may infiltrate into the gaps between the steel wires constituting the steel cords and cause the steel cords to rust. Therefore, gaps are formed inside the steel cord, so that rubber penetrates into the steel cord when vulcanized, thereby blocking the path of water. Under such circumstances, Patent Document 1 proposes a composite cord by twisting a sheath c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06B60C9/00
CPCD07B1/062D07B1/0626D07B1/0633D07B1/167D07B2201/2029D07B2201/2046D07B2201/2073D07B2207/4059D07B2401/2025D07B2401/204B60C9/0007B60C2009/0092B60C9/005B60C9/0042D02G3/48D07B2201/2044D07B2801/60D07B1/0693D07B2201/1016D07B2201/104D07B2201/2009D07B2201/201D07B2205/2075D07B2205/3025
Inventor 雫孝久
Owner BRIDGESTONE CORP