Patent ID: 6111008
Filing Date: 2000-08-29
Classification: B60C,C08K

Abstract:
A tire having a tread of a rubber composition comprised of, based upon 100 phr of elastomer(s), (A) 100 phr of at least one diene-based elastomer, (B) about 35 to about 110 phr of reinforcing filler composed of about 15 to about 25 phr of carbon black and correspondingly about 20 to about 85 phr of precipitated silica and (C) a silica coupler having a moiety reactive with silanol groups on the surface of said silica and another moiety interactive with at least one of said diene-based elastomers; characterized in that said carbon black consists of at least 30 phr of a first carbon black characterized by having a DBP adsorption value in a range of about 280 to about 600 cm.sup.3 /100 g and an Iodine adsorption value in a range of about 550 to about 1200 g/kg and not more than 8 phr of a second carbon black characterized by DBP adsorption value in a range of about 100 to about 150 cm.sup.3 /100 g and an Iodine adsorption value in a range of about 40 to about 150 g/kg, and further characterized in that said second carbon black is a carrier for the silica coupler; where the silica coupler is a liquid bis(trialkoxysilylalkyl) polysulfide having an average of about 2 to 5 sulfur atoms in its polysulfidic bridge.