Rubber composition for a colored tire

a technology of rubber composition and colored tires, applied in the field of rubber compositions for tires, can solve the problems of vulcanized rubber compositions of essentially unsaturated, likely to deteriorate more or less rapidly, antioxidants described,

Inactive Publication Date: 2001-12-27
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that, vulcanized rubber compositions of essentially unsaturated natural and synthetic diene rubbers, because of the presence of double bonds in their molecular chains, are likely to deteriorate more or less rapidly after prolonged exposure to the atmosphere, if they are not protected, as a result of known oxidation mechanisms.
However, the antioxidants described previously, which have been developed and optimized after many years of research into conventional black rubber compositions, are not suitable for protecting tire rubber compositions filled exclusively with white fillers, in particular silica or alumina, because such antioxidants, and in particular the TMQ or PPD derivatives referred to above, are not light-fast.
Under the action of UV radiation, they undergo an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0104] In the following examples, the rubber compositions are prepared by processing the diene elastomers according to known techniques, e.g., by thermomechanical working in a internal paddle mixer, followed by mixing on an external mixer.

[0105] By way of example, the procedure is as follows: the elastomer or the mixture of elastomers is introduced into an internal mixer, filled to 70%, the temperature of which is about 60.degree. C., then after a suitable kneading time, for example of the order of 1 minute, all the other ingredients are added with the exception of the vulcanization system; the thermomechanical kneading work is continued until a dropping temperature of 175.degree. C. The mixture thus obtained is recovered, then the vulcanization system is added on an external mixer (homo-finisher) at 30.degree. C. The vulcanization is effected at 150.degree. C. for 45 minutes.

[0106] In this test, seven red rubber compositions intended for the manufacture of tire treads are compared....

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Abstract

The invention concerns a white, light-colored tire rubber composition, devoid of carbon black, comprising at least a diene elastomer, a reinforcing white or colored filler, and an anti-photo-oxidizing system, wherein said protective system comprises (A) a 2,2'-methylene-bis-[4-alkyl (C1-C10)-6-alkyl(C1-C12)phenol]; (B) a dialkylthiodipropionate, the alkyl radicals thereof, which may be identical or different, are (C1-C20), radicals; (C) a 2-(2-hydroxyphenyl) benzotriazole; and (D) a "HALS" amine derived from 2,2,6,6-tetramethylpiperidine.

Description

BACKGROUND OF INVENTION[0001] The present invention relates to rubber compositions for tires, and also to the antidegradants intended to protect these compositions against atmospheric photo-oxidizing aging due to the combined action of oxygen and light.[0002] The inventiont relates more particularly to the anti-photo-oxidizing protection of white, clear or colored diene rubber compositions, which are devoid of carbon black, that are reinforced by at least one white or colored filler, in particular silica. Such compositions are sulphur-vulcanizable and form part of colored tires.[0003] It is known that, vulcanized rubber compositions of essentially unsaturated natural and synthetic diene rubbers, because of the presence of double bonds in their molecular chains, are likely to deteriorate more or less rapidly after prolonged exposure to the atmosphere, if they are not protected, as a result of known oxidation mechanisms. These complex mechanisms have been described, for example, in th...

Claims

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Application Information

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IPC IPC(8): C08K5/13C08K5/3435C08K5/3475B60C1/00C08K5/372C08L21/00
CPCC08K5/13C08K5/3435C08K5/3475C08K5/372C08L21/00
Inventor VASSEUR, DIDIER
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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