Tire undertread

Patent metadata

Field	Value
Publication number	US-2019016178-A1
Application number	US-201616066513-A
Country	US
Kind code	A1
Filing date	Dec 29, 2016
Priority date	Dec 31, 2015
Publication date	Jan 17, 2019
Grant date	—

Abstract

Rubber compositions that are particularly suitable for the undertread for a tire tread, such rubber compositions including a functionalized polybutadiene rubber and a second rubber component such as a styrene butadiene copolymer, natural rubber, another polybutadiene or other diene rubber or combinations thereof. Such rubber compositions are reinforced with a carbon black reinforcing filler that may be characterized as a low-surface area, high structure carbon black having a nitrogen surface area of between 15 m 2 /g and 25 m 2 /g and a COAN of between 65 ml/100 g and 85 ml/100 g.

First claim

1 . A tread for a tire that comprises an undertread, the undertread formed from a rubber composition that is based upon a cross-linkable rubber composition, the cross-linkable composition comprising, per 100 parts by weight of rubber (phr):
at least 20 phr of a functionalized polybutadiene rubber having a functional group that is capable of interacting with carbon black; between 0 phr and 80 phr of a second rubber component; a low-surface area, high structure carbon black having a nitrogen surface area of between 15 m 2 /g and 25 m 2 /g and a COAN of between 65 ml/100 g and 85 ml/100 g; and a curing system.

2 . The tread of claim 1 , wherein the functionalized polybutadiene rubber is a tin coupled end-functionalized polybutadiene rubber.

3 . The tread of claim 2 , wherein the polybutadiene rubber is end-functionalized with an amine group.

4 . The tread of claim 1 , wherein the cross-linkable rubber composition comprises between 40 phr and 80 phr of the carbon black.

5 . The tread of claim 1 , wherein an OAN of the carbon black is between 100 ml/100 g and 150 ml/100 g.

6 . The tread of claim 5 , wherein an iodine number of the carbon black is between 10 mg/g and 25 mg/g.

7 . The tread of claim 6 , wherein the cross-linkable rubber composition comprises between 40 phr and 60 phr of the functionalized polybutadiene rubber.

8 . The tread of claim 1 , wherein the second rubber component is selected from polybutadienes (BR), polyisoprenes (IR), natural rubber (NR), butadiene copolymers, isoprene copolymers and mixtures of these elastomers.

9 . The tread of claim 8 , wherein the second rubber component is natural rubber.

10 . The tread of claim 3 , wherein the cross-linkable rubber composition comprises between 40 phr and 80 phr of the carbon black.

11 . The tread of claim 10 , wherein an OAN of the carbon black is between 100 ml/100 g and 150 ml/100 g.

12 . The tread of claim 11 , wherein an iodine number of the carbon black is between 10 mg/g and 25 mg/g.

13 . The tread of claim 12 , wherein the cross-linkable rubber composition comprises between 40 phr and 60 phr of the functionalized polybutadiene rubber.

14 . The tread of claim 13 , wherein the second rubber component is selected from polybutadienes (BR), polyisoprenes (IR), natural rubber (NR), butadiene copolymers, isoprene copolymers and mixtures of these elastomers.

15 . The tread of claim 14 , wherein the second rubber component is natural rubber.

Assignees

• Michelin & Cie

Inventors

• Stubblefield Raymond
• Piffard Olivier

Classifications

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K3/04

  Carbon · CPC title

• C08F2500/03

  Narrow molecular weight distribution, i.e. Mw/Mn < 3 · CPC title

• C08K3/08

  Metals · CPC title

• C08L9/06

  Copolymers with styrene · CPC title