Tire tread reinforced with a silica of low specific surface...

Details Tire tread reinforced with a silica of low specific surface... Tire tread reinforced with a silica of low specific surface...

2007-11-27

2007-11-27

Cain, Edward J. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S492000, C524S495000

Reexamination Certificate

active

10745649

ABSTRACT:
A tire tread incorporating an elastomeric composition reinforced by an inorganic filler, based on at least:(i) a diene elastomer;(ii) as reinforcing inorganic filler, more than 80 phr of a silica of low specific surface area having the following characteristics:(a) a BET specific surface area of less than 130 m2/g;(b) an average particle size, dw, of between 30 and 300 nm;(iii) a coupling agent providing the bond between the reinforcing inorganic filler and the diene elastomer;(iv) a vulcanization system comprising sulfur, a vulcanization accelerator and between 0.5 and 1.5 phr of zinc as vulcanization activator.Preferably, this silica furthermore has a disagglomeration rate α greater than 5×103μm−1/min (measured in the ultrasound disagglomeration test). Compared with a conventional tread for “Green Tires” which is reinforced with a silica of higher specific surface area, the tread of the invention has an improved compromise of (wear resistance/rolling resistance/grip on wet ground) performances. The use of a very small amount of zinc makes it possible to overcome an increase in the induction delays during the vulcanization, when such a silica of low specific surface area is used.

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