Tire for a civil-engineering vehicle

Patent metadata

Field	Value
Publication number	US-2020254815-A1
Application number	US-201816625581-A
Country	US
Kind code	A1
Filing date	Jun 21, 2018
Priority date	Jun 22, 2017
Publication date	Aug 13, 2020
Grant date	—

Abstract

A tire for a heavy vehicle of civil engineering type, intended to be fitted onto a rim, is provided. The nominal diameter of the tire is at least equal to 25 inches. The tire comprises a tread having a radial thickness HT at least equal to 30 mm. The tread has a composition based on at least one diene elastomer, a reinforcing filler predominantly comprising a filler at least partially covered with silica, an agent for coupling the filler to the east one diene elastomer and a crosslinking system. The dispersion of the filler in the elastomeric matrix has a Z score of greater than or equal to 70.

First claim

1 . A tire for a heavy vehicle of civil engineering type, the nominal diameter of the tire being at least equal to 25 inches, the tire comprising: a tread having a radial thickness HT at least equal to 30 mm, and the tread having a composition based on at least one diene elastomer, a reinforcing filler predominantly comprising a filler at least partially covered with silica, an agent for coupling the filler to the at least one diene elastomer and a crosslinking system, and the dispersion of the filler in the elastomeric matrix has a Z score of greater than or equal to 70.

2 . A tire according to claim 1 , in which the composition constitutes the whole of the tread.

3 . A tire according to claim 1 , in which the tread comprises at least one first radially exterior layer which comes into contact with the ground and a second radially interior layer, the composition constituting at least of the two layers.

4 . A tire according to claim 1 , in which the tread comprises a first radially exterior layer which comes into contact with the ground, a second radially interior layer and a third layer radially interior to the second layer, the composition constituting at least of the three layers.

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

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

7 . A tire according to claim 1 , in which the filler at least partially covered with silica is chosen from carbon black, metal hydroxides, and crosslinked polymer particles.

8 . A tire according to claim 7 , in which the filler covered at least partially by silica consists of carbon black.

9 . A tire according to claim 1 , in which the filler at least partially covered with silica is used with a content varying from 25 to 90 phr in the composition.

10 . A tire according to claim 1 , in which the filler at least partially covered with silica is used as a blend with carbon black in the composition.

11 . A tire according to claim 1 , in which the filler at least partially covered with silica is used as a blend with silica in the composition.

12 . A tire according to claim 10 , in which the total content of reinforcing filler of the composition varies from 30 to 75 phr, the content of carbon black varying from 1 to 30 phr.

13 . A 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.

14 . A tire according to claim 13 , in which the diene elastomer is a natural rubber.

15 . A tire according to claim 1 , which comprises less than 15 phr of plasticizing agents.

16 . A tire according to claim 1 , in which the filler at least partially covered with silica constitutes at least 95% by weight of the total reinforcing filler of the composition.

17 . A tire according to claim 11 , in which the total content of reinforcing filler of the composition varies from 30 to 75 phr, the content of silica varying from 1 to 30 phr.

18 . A tire according to claim 1 , which comprises less than 15 phr of plasticizing agents.

Assignees

• Michelin & Cie

Inventors

• Goncalves Olivier
• Olagnon Jean-François

Classifications

• B60C2200/065

  for construction vehicles · CPC title

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• B60C11/005

  with cap and base layers · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title