Patent ID: 6053226
Filing Date: 2000-04-25
Classification: B60C,C08K,Y10S

Abstract:
A method of preparing a rubber composition which comprises, based upon 100 phr of elastomer(s), blending ingredients comprised of (A) 100 phr of at least one diene-based elastomer, (B) about 35 to about 110 phr of reinforcing filler comprised of about 25 to about 100 phr of precipitated silica and correspondingly about 10 to about 25 total phr of carbon black, and (C) about 2 to about 20 phr of pre-formed composite of specified material and specified carbon black, wherein said specified material is a liquid or semi-liquid material having a softening point of less than 120.degree. C. selected from the group consisting of:A. microcrystalline wax,B. silica coupling agent,C. antidegradant, andD. vulcanization accelerator;wherein said silica coupling agent has a moiety reactive with silanol groups on the surface of said silica and another moiety interactive with said elastomer(s); wherein the weight ratio of said specified material to said carbon black of said pre-formed composite is in a range of about 0.5/1 to about 3/1; and wherein said carbon black of said pre-formed composite has a DBP adsorption value in a range of about 280 to about 600 cm.sup.3 /100 g and a BET value in a range of about 550 to about 1200 m.sup.2 /g; and wherein said pre-formed composite is prepared by coating said specified material onto the surface of said carbon black.