FIELD: rubber industry. SUBSTANCE: Rubber compound is prepared by mixing 100 wt parts of rubber and 10-300 wt parts of soot product having added organic group -Ar-(S)n-Ar′ wherein Ar and Ar' are arylene groups and n varies from 1 to 8, after which mix is additionally cured. Suited is also soot product with added group -Ar-(S)n-Ar″ wherein Ar is arylene group, Ar" aryl group, and n=1-8. EFFECT: increased rubber modulus and increased degree of linkage in rubber. 10 cl, 3 tbl, 9 ex
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