| 摘要 |
A process for preparing rubber compositions comprised of a (a) 100 parts rubber material including 65-100 parts of cis-polyisoprene and optionally at least one additional high unsaturation rubber, (b) 40-70 parts Carbon Black and (c) conventional vulcanization and processing additives. The composition is mixed in two consecutive stages, in the first stage all the carbon black is mixed with at least 50 parts of the cis-polyisoprene, and in the second stage the remaining polyisoprene and any optional additional rubber is added to the mix. This method of mixing material has been observed to produce a rubber composition having enhanced tear and adhesion properties as compared with conventional processes where the rubber is mixed with the carbon black in one mixing stage. Thus, the invention is also directed to the resulting rubber composition and to a composite of such composition containing a filament reinforcement.
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