Silica-rubber mixtures having improved hardness

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...

Reexamination Certificate

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C524S493000

Reexamination Certificate

active

07432321

ABSTRACT:
A method for increasing the hardness of silica/rubber mixtures includes blending with the mixture at least one silane and a hardness-increasing amount of at least one member selected from the group consisting of thixotropic fumed silica, precipitated silica and an MQ resin, wherein Q is SiO4/2, M is R1R2R3SiO1/2, and R1,R2,and R3are the same or different functional or non-functional organic groups, carbon black, a thermoplastic resin or a thermosetting resin.

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