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...
Patent
1997-01-16
1999-06-29
Truong, Duc
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...
524492, 524571, 525 55, 525 99, 525316, 521134, 528376, C08J 340, C08K 304
Patent
active
059169567
ABSTRACT:
In a multi-stage process for producing a substantially unvulcanized elastomer composition, a masterbatch is produced by thermomechanical working in a first or other early stage of the multi-stage process. The masterbatch comprises sulfur crosslinkable hydrocarbon elastomer in which is substantially dispersed, particulate fillers, for example carbon black or silicon-treated carbon black, modified carbon black and/or silica and sulfur crosslinking agent effective to crosslink the hydrocarbon elastomer and selected from sulfur donors and sulfur. The filler and sulfur crosslinking agent can be mixed together as a pre-blend prior to being added to the elastomer. The substantially unvulcanized elastomer is then produced in one or more later stages of the multi-stage process, involving further theromechanical working of the masterbatch. A curative additive comprising accelerator, and optionally additional sulfur crosslinking agent, is added and dispersed in the elastomer in the last stage of the multistage process. In accordance with another aspect, oil is added to the elastomer subsequent to addition and substantial dispersion of the filler and sulfur crosslinking agent. The substantially unvulcanized elastomer composition can be cured or vulcanized to form tire tread and other commercial products. Significant improvement in performance characteristics is achieved by preferred embodiments, including good abrasion resistance and low hysteresis measured, for example, as tan .delta..sub.max at 70.degree. C.
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Brown Trevor Alan
Dickinson Ralph E.
Wang Meng-Jiao
Cabot Corporation
Truong Duc
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