Heavy vehicle treads/undertread
View Patent ↗Heavy vehicle tire treads and/or undertread constituted at least in part from a rubber composition comprising between 80 and 100 phr of a natural rubber and between 0 and 20 phr of a synthetic polyisoprene rubber, a reinforcement filler comprising a) between 30 and 50 phr of a highly dispersible silica and b) a carbon black in an amount of between (0.75)C phr and (1.25)C phr as determined by the equation C=−0.8Si+44.3, wherein Si is the amount of the highly dispersible silica, a silane coupling agent and a sulfur curing system comprising between 1.5 and 3 phr of free sulfur and between (0.9)A phr and (L 1)A phr of a sulfenamide accelerator, wherein A is determined by a formula that is a function of the sulfur quantity and the silica weight fraction of the total reinforcement filler.
1. A heavy vehicle tire having a tread and an undertread, the tread, the undertread or both being constituted at least in part from a material based upon a rubber composition, the rubber composition comprising, per 100 parts by weight of rubber:
between 80 and 100 phr of a natural rubber;
between 0 and 20 phr of a synthetic polyisoprene rubber;
a reinforcement filler comprising a) a highly dispersible silica in an amount of between 30 and 45 phr and b) a carbon black in an amount of between (0.75)C phr and (1.25)C phr as determined by the equation
C=− 0.8Si+44.3,
wherein Si is the amount (phr) of the highly dispersible silica;
a silane coupling agent; and
a sulfur curing system comprising between 1.5 and 3 phr of free sulfur and between (0.9)A phr and (1.1)A phr of a sulfenamide accelerator, wherein A is determined by the formula
A =(0.0059S -1.45 +0.0045Y)(MW),
wherein S is the quantity (phr) of the free sulfur, Y is a weight fraction of the silica reinforcement filler based on the total weight of the reinforcement filler and MW is a molecular weight of the sulfenamide accelerator.
2. The heavy vehicle tire of claim 1 , wherein the rubber composition comprises 100 phr of the natural rubber and 0 phr of the synthetic polyisoprene rubber.
3. The heavy vehicle tire of claim 1 , wherein the rubber composition comprises 100 phr of the natural rubber and the synthetic polyisoprene rubber.
4. The heavy vehicle tire of claim 1 , wherein the sulfenamide accelerator is CBS.
5. The heavy vehicle tire of claim 1 , wherein the reinforcement filler comprises between 30 and 45 phr of the highly dispersible silica.
6. The heavy vehicle tire of claim 1 , wherein the sulfur curing system comprises between 1.6 and 2.8 phr of free sulfur.
7. The heavy vehicle tire of claim 1 , wherein the sulfur curing system comprises between 0.97A and 1.03A phr of the sulfenamide accelerator.
8. The heavy vehicle tire of claim 1 , wherein the carbon black is added in an amount of between 0.9C and 1.1C phr of carbon black.
9. A heavy vehicle tire tread constituted at least in part from a material based upon a rubber composition, the rubber composition comprising, per 100 parts by weight of rubber:
between 80 and 100 phr of a natural rubber;
between 0 and 20 phr of a synthetic polyisoprene rubber;
a reinforcement filler comprising a) a highly dispersible silica in an amount of between 30 and 45 phr and b) a carbon black in an amount of between (0.75)C phr and (1.25)C phr as determined by the equation
C=− 0.8Si+44.3,
wherein Si is the amount (phr) of the highly dispersible silica;
a silane coupling agent; and
a sulfur curing system comprising between 1.5 and 3 phr of free sulfur and between (0.9)A phr and (1.1)A phr of a sulfenamide accelerator, wherein A is determined by the formula
A =(0.0059S −1.45 +0.0045Y)(MW),
wherein S is the quantity (phr) of the free sulfur, Y is a weight fraction of the silica reinforcement filler based on the total weight of the reinforcement filler and MW is a molecular weight of the sulfenamide accelerator.
10. The heavy vehicle tire tread of claim 9 , wherein the rubber composition comprises 100 phr of the natural rubber and 0 phr of the synthetic polyisoprene rubber.
11. The heavy vehicle tire tread of claim 9 , wherein the rubber composition comprises 100 phr of the natural rubber and the synthetic polyisoprene rubber.
12. The heavy vehicle tire tread of claim 9 , wherein the sulfenamide accelerator is CBS.
13. The heavy vehicle tire tread of claim 9 , wherein the reinforcement filler comprises between 30 and 45 phr of the highly dispersible silica.
14. The heavy vehicle tire tread of claim 9 , wherein the sulfur curing system comprises between 1.6 and 2.8 phr of free sulfur.
15. The heavy vehicle tire tread of claim 9 , wherein the sulfur curing system comprises between 0.97A and 1.03A phr of the sulfenamide accelerator.
16. The heavy vehicle tire tread of claim 9 , wherein the carbon black is added in an amount of between 0.97C and 1.03C phr of carbon black.
17. The heavy vehicle tire tread of claim 9 , wherein the tire tread is a tread band for bonding to a buffed tire during a re-tread process.
18. A heavy vehicle tire having a tread and an undertread, the tread being constituted at least in part from a material based upon a rubber composition, the rubber composition comprising, per 100 parts by weight of rubber:
between 80 and 100 phr of a natural rubber;
between 0 and 20 phr of a synthetic polyisoprene rubber;
a reinforcement filler comprising a) a highly dispersible silica in an amount of between 30 and 45 phr and b) a carbon black in an amount of between (0.75)C phr and (1.25)C phr as determined by the equation
C=− 0.8Si+44.3,
wherein Si is the amount (phr) of the highly dispersible silica;
a silane coupling agent; and
a sulfur curing system comprising between 1.5 and 3 phr of free sulfur and between (0.9)A phr and (1.1)A phr of a sulfenamide accelerator, wherein A is determined by the formula
A =(0.0059S −1.45 +0.0045Y)(MW),
wherein S is the quantity (phr) of the free sulfur, Y is a weight fraction of the silica reinforcement filler based on the total weight of the reinforcement filler and MW is a molecular weight of the sulfenamide accelerator.