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Radial-carcass tires formed by using specific cohesive, low-hysteresis compositions

a technology of composition and radial carcass, which is applied in the direction of special tyres, tyre beads, transportation and packaging, etc., can solve the problems of shortened tire life, large amount of heating, and the need to re-use the tire cover

Inactive Publication Date: 2009-12-03
MICHELIN RECH & TECH SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In order to eliminate or at the very least minimize as far as possible the risks of breaking of the elastomeric internal filler mixes, i.e., those devoid of reinforcements, it is desirable for these mixes to have high mechanical cohesion as well as hysteresis loss characteristics which are as low as possible at the operating temperature of the tire.
[0013]The Applicant has discovered that it is possible to obtain a balance between heating and improved cohesion and excellent resistance to the mechanical stresses with high deformation by the use of an elastomeric internal filler composition:

Problems solved by technology

The life of the tire is shortened due to the appearance of damage within a rubber profiled filling member, for example a break, which may then spread as far as the inner or outer surface of the tire, with the result that the tire cover must be discarded and replaced.
Such deformation causes a great amount of heating which is harmful to the life of said compositions because, at operating temperatures which are frequently above 100° C., the mechanical properties and the reinforcement degrade over time by thermochemical and / or the thermo-oxidizing aging, with the consequence that the compositions become less resistant to mechanical stress.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043]The object of this example is to compare natural rubber compositions which are reinforced with silica, as a majority filler, compared with control compositions based on a majority of carbon black. These compositions are set forth in Table 1. They comprise, in the case of test 1, a composition according to the invention having a majority of silica and of carbon black, with the covering agent for the silica being Si116 (hexadecyltrimethoxysilane, from Degussa) and, in the case of test 2, a composition of the invention having a majority of silica and of carbon black, with polydimethylsiloxane of a molecular weight close to 400 (PDMS) as covering agent for the silica. The compositions used in tests 3 and 4 are controls representing the known prior art. The composition of test 3 contains a majority of carbon black and of silica bonded to the elastomer with the bonding agent X50S from Degussa and that of test 4 is composition based on N330. All these compositions are sulphur-vulcani...

example 2

[0053]The object of this example is to compare compositions reinforced with silica as majority filler by varying the nature of the bonding and covering agents. In this example, the vulcanization system is adjusted so that the moduli of elongation at 100% are sufficiently close to draw reliable conclusions as to the effects of the parameters studied. The compositions according to the invention are set forth in Table 3. They comprise, in the case of tests 5, 6 and 7, compositions having silica as sole filler, in an amount of 30 phr with, respectively, a coupling agent X50S (test 5), a polyethylene glycol covering agent of a molecular weight of 4000 (test 6) and another polydimethylsiloxane covering agent (test 7). In the case of tests 8 to 12, the reinforcing filler is formed by a blend of silica and 5 phr of N330. The object of this example is to compare compositions reinforced with silica as majority filler by varying the nature of the bonding agents and covering agents, the vulcani...

example 3

[0060]The object of this example is to compare compositions reinforced with silica as sole or majority filler, where the elastomeric matrix is based on natural rubber, either pure or in a blend with another diene elastomer or based on synthetic polyisoprene having a large number of cis-1,4 bonds. These compositions are set forth in Table 5. They comprise, in the case of tests 13, 14 and 15, natural rubber filled with increasing amounts of filler. In the cases of tests 16 and 17, the natural rubber of test 15 is replaced by a blend of natural rubber with another minority diene elastomer or a cis-1,4 polybutadiene (cis-1,4 BR), obtained with a titanium-based catalyst, and a solution SBR of Mooney ML (1+4) of 54, of Tg −48° C., having a 1,2 bond content of 24% and a 16.5% styrene content. In the case of test 19, the natural rubber with 30 parts of silica filler of test 18 is replaced by a synthetic polyisoprene having a large number of cis-1,4 bonds. In the case of test 20, which is no...

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Abstract

The subject of the present invention is the use of cohesive, low-hysteresis compositions comprising small amounts of reinforcing fillers to produce profiled filing members arranged in the bottom zone of tires in order to improve the life thereof.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of application Ser. No. 09 / 501,408, filed Feb. 10, 2000, which claims priority under 35 U.S.C. § 119 from French Patent Application, No. 99 / 01766, filed Feb. 11, 1999, the disclosures of both of which are incorporated by reference herein in their entirety.SPECIFICATION[0002]The present invention relates to the use of rubber compositions intended for the manufacture of tires as elastomeric internal filling compositions, also referred to as “cushion mixes”, in the bottom zone of a tire.[0003]Radial-carcass tires for motor vehicles bearing heavy loads at greater or lesser speeds, in particular those for heavy vehicles, have a framework formed of reinforcements or plies of metal wires coated with elastomers. Such tires comprise in the bottom zone, one or more bead wires and a carcass reinforcement extending from one bead wire to the other and, at the crown, a crown reinforcement comprising two or more crown p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60C15/00B60C1/00B60C9/18B60C15/06C08K3/04C08K3/22C08K3/36C08K9/02C08K9/04C08L7/00C08L9/00C08L21/00
CPCB60C1/00B60C1/0025B60C9/18Y10T152/10846C08L21/00Y10T152/10855B60C15/06
Inventor SERRE, FREDERIC
Owner MICHELIN RECH & TECH SA
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