US 7,396,870 B2Granted

Composition for a tire tread and process for its preparation

AssigneeMichelin Recherche et Technique S.A.

InventorsPierre Robert, Jean-Michel Favrot, Philippe Laubry, Fanny Barbotin

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Abstract

The present invention relates to a cross-linkable or cross-linked rubber composition having improved hysteresis properties in the cross-linked state which is useful for the manufacture of treads for tires. The rubber composition of the present invention comprises at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, and a reinforcing inorganic filler. The present invention further relates to a process for preparing such a cross-linkable or cross-linked rubber composition as well as to a tire having reduced rolling resistance and a tread for a tire where the tread comprises the rubber composition of the present invention.

Claims18

Dependent claims

A cross-linkable or cross-linked rubber composition usable to constitute a tread for a tire, wherein said composition comprises:

(a) a reinforcing filler comprising a reinforcing inorganic filler, wherein the mass fraction of said reinforcing inorganic filler in said reinforcing filler is greater than 50%;
(b) at least one diene elastomer having a molar ratio of units originating from conjugated dienes which is greater than 30% and comprising carboxylic acid functions along its chain, wherein said diene elastomer comprising carboxylic acid functions along its chain is obtained, in emulsion, by a copolymerization process including adding to an emulsifying solution a co-monomer comprising an unsaturated aliphatic carboxylic acid, such that said at least one diene elastomer comprises unsaturated aliphatic carboxylic acid function along its chain;
(c) a reinforcing inorganic filler/diene elastomer coupling agent;
and
(d) a sulphur-based cross-linking system.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/858,204Filed 2 Jun 2004 · division
Priority: FR 00 0659722 May 2000
Published: US 2004/0220315 A14 Nov 2004
Granted: 8 Jul 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

C08K 3/36
Silicon-containing compounds: silica
B60C 1/0016
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the tread
C08C 19/26
Chemical modification of rubber: incorporating metal atoms into the molecule
C08C 19/42
Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule: reacting with metals or…

Family

PCT/EP01/05802Parent of this continuation · filed 21 May 2001
Application10/303,112Parent of this division · filed 22 Nov 2002
US 2004/0220315 A1Pre-grant publication · published 4 Nov 2004
US 6,815,487 B2Parent of this division
Application10/303,112Parent of this continuation
US 2003/0195288 A1Published application
US 7,396,870 B2This patent

From the US filing history. Foreign family members aren’t listed.