Tire for heavy goods vehicle

Patent metadata

Field	Value
Publication number	US-2021155039-A1
Application number	US-201816624723-A
Country	US
Kind code	A1
Filing date	Jun 21, 2018
Priority date	Jun 22, 2017
Publication date	May 27, 2021
Grant date	—

Abstract

The tire has a radial carcass reinforcement intended to equip vehicles carrying heavy loads and running at sustained speed. The tire comprises a crown reinforcement, itself capped radially with a tread joined to two beads via two sidewalls. The tread comprises at least two radially superposed layers of polymeric compound, a radially outer first layer that comes into contact with the ground and a radially inner second layer. The second layer has a composition based on at least a diene elastomer, a reinforcing filler comprising predominantly a filler covered at least partially by silica, an agent for coupling the filler with the elastomer and a crosslinking system. The dispersion of the filler in the elastomeric matrix has a Z value greater than or equal to 70.

First claim

What is claimed is:

1 ) A tire having a radial carcass reinforcement intended to equip vehicles carrying heavy loads and running at sustained speed, comprising a crown reinforcement, itself capped radially with a tread joined to two beads via two sidewalls, said tread comprising at least two radially superposed layers of polymeric compound, a radially outer first layer that comes into contact with the ground and a radially inner second layer, wherein the second layer has a composition based on at least a diene elastomer, a reinforcing filler comprising predominantly a filler covered at least partially by silica, an agent for coupling the filler with the elastomer and a crosslinking system, the dispersion of the filler in the elastomeric matrix having a Z value greater than or equal to 70.

2 ) The tire according to claim 1 , in which the tread comprises a third layer radially on the inside of the second layer, the third layer having a composition identical to or different from that of the second layer.

3 ) The tire according to claim 1 , in which the filler covered at least partially by silica constitutes at least 60% by weight of the total reinforcing filler of the composition.

4 ) The tire according to claim 1 , in which the filler covered at least partially by silica constitutes at least 80% by weight of the total reinforcing filler of the composition.

5 ) The tire according to claim 1 , in which the filler covered at least partially by silica is selected from carbon black, metal hydroxides, especially magnesium or aluminium hydroxides, and crosslinked polymer particles.

6 ) The tire according to claim 5 , in which the filler covered at least partially by silica consists of carbon black.

7 ) The tire according to claim 1 , in which the filler covered at least partially by silica is used with a content ranging from 25 to 90 phr in the composition.

8 ) The tire according to claim 1 , in which the filler covered at least partially by silica is used in a blend with carbon black in the composition.

9 ) The tire according to claim 1 , in which the filler covered at least partially by silica is used in a blend with silica in the composition.

10 ) The tire according to claim 8 , in which the total content of reinforcing filler of the composition varies from 30 to 75 phr, the content of carbon black or of silica varying from 1 to 30 phr.

11 ) The tire according to claim 1 , in which the diene elastomer of the composition is selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers and mixtures of these elastomers.

12 ) The tire according to claim 11 , in which the diene elastomer is a natural rubber.

13 ) The tire according to claim 1 , which comprises less than 15 phr of plasticizing agents, preferably less than 5 phr.

Assignees

• Michelin & Cie

Inventors

• Goncalves Olivier
• Kallungal Abdul Jaleel Muhamed Jesbeer
• Vallat Perrine

Classifications

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K3/36 Primary

  Silica · CPC title

• C08K3/04

  Carbon · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title