US 7,253,225 B2Granted

Rubber composition for a tire tread

AssigneeMichelin Recherche et Technique S.A.

InventorsGerard Labauze, Didier Vasseur

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Abstract

The invention relates to a cross-linked rubber composition for a tire tread having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240, wherein the composition comprises greater than 25 phr and up to 100 phr, of one or more diene elastomers each having a temperature Tg of between −75° C. and −40° C., less than 75 phr and down to 0 phr, of one or more diene elastomers each having a temperature Tg of between −110° C. and −75° C., from 5 phr to 35 phr, of at least one hydrocarbon plasticizing resin miscible in said elastomer(s), said resin having a Tg of between 10° C. and 150° C. and a molecular weight Mn of between 400 and 2000 g/mol, and from 5 phr to 35 phr of at least one synthetic or natural plasticizing compound which comprises at least one glycerol fatty acid triester, wherein an aggregate constituted by the fatty acid(s) comprises oleic acid in a mass fraction equal to or greater than 60%.

Claims37

Dependent claims

A tire tread comprising a cross-linked rubber composition having a Shore A hardness greater than 45 and less than 57, measured in accordance with Standard ASTM D 2240 of 1997, said composition comprising:

greater than 25 phr and up to 100 phr, of one or more diene elastomers each having a glass transition temperature Tg between −75° C. and −40° C.,
less than 75 phr and down to 0 phr, of one or more diene elastomers each having a glass transition temperature Tg between −110° C. and −75° C.,
from 5 phr to 35 phr, of at least one hydrocarbon plasticizing resin miscible in said diene elastomer(s), and said resin having a glass transition temperature Tg between 10° C. and 150° C. and a number-average molecular weight between 400 g/mol and 2000 g/mol, and
from 5 phr to 35 phr, of natural plasticizing compound, comprising at least one glycerol fatty acid triester, wherein the at least one glycerol fatty acid triester is sunflower vegetable oil having a Tg between −100° C. and −70° C., and wherein oleic acid represents in a mass fraction at least 60% of the total of fatty acid(s).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 11/071,500Filed 3 Mar 2005 · continuation
Priority: FR 02 109504 Sep 2002
Published: US 2005/0148713 A17 Jul 2005
Granted: 7 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

C08L 9/00
Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
B60C 1/0016
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the tread
C08K 5/0016
Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59: plasticisers
C08K 5/103
Of monocarboxylic acids: with polyalcohols