Tire with tread of rubber and carbon black with silica...

Details Tire with tread of rubber and carbon black with silica... Tire with tread of rubber and carbon black with silica...

2008-04-01

2008-04-01

Sanders, Kriellion A (Department: 1796)

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...

C524S495000, C524S858000, C524S862000, C524S865000, C525S105000, C528S025000

Reexamination Certificate

active

07351763

ABSTRACT:
A tire is provided having a circumferential tread of a diene-based rubber composition reinforced with a silica-containing carbon black which contains domains of silica on its surface prepared by extended reactive mixing of said silica-containing carbon black with a coupling agent together with at least one elastomer. Said silica-containing carbon black is a carbon black which contains silica domains on its surface and said silica contains hydroxyl groups (e.g. silanol groups) on its surface, wherein said silica domains cover at least 50 percent of the carbon black surface. Said coupling agent is a bis(3-triethoxysilylpropyl) polysulfide having an average of from 2 to 4, alternately a more limited average of from 2 to 3 or from 2 to 2.6, connecting sulfur atoms in its polysulfidic bridge. In one aspect of the invention, it is preferred that said coupling agent is exclusive of a bis(3-trialkoxysilylalkyl) polysulfide having an average of greater than 3.5 sulfur atoms in its polysulfidic bridge.

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Rubber World, Apr. 2, 2002, p. 43.

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