Patent ID: 6573324
Filing Date: 2003-06-03
Classification: B60C,C08K

Abstract:
A tire which contains at least one component comprised of a rubber composition comprised of, based on 100 parts by weight (phr) of diene-based elastomer,(A) 100 phr of at least one hydrocarbon conjugated diene-based elastomer, (B) about 10 to about 120 phr of reinforcing filler comprised of (i) particulate, pre-hydrophobated precipitated silica aggregates, and optionally (ii) about 2 to about 100 phr of additional reinforcing filler selected from at least one of carbon black and additional synthetic amorphous silica, wherein said pre-hydrophobated precipitated silica is formed by treating silica in an aqueous colloidal form thereof with both an organomercaptosilane and an alkylsilane in a weight ratio of said organomercaptosilane to said alkylsilane in a range of from 10/90 to 90/10; wherein said alkylsilane is of the general Formula (I) Xnâ€”Siâ€”R4âˆ’nâ€ƒâ€ƒ(I) wherein R is an alkyl radical having from one to 18 carbon atoms, n is a value of from 1 to 3 and X is a radical selected from chlorine, bromine, and alkoxy radicals as (R1O)â€”, wherein R1 is an alkyl radical having from one to 3 carbon atoms, andwherein said organomercaptosilane is of the general formula (II): (X)n(R2O)3âˆ’nâ€”Siâ€”R3â€”SHâ€ƒâ€ƒ(II) wherein X is a radical selected from chlorine, bromine, and alkyl radicals having from one to 16 carbon atoms; wherein R2 is an alkyl radical having from one to 16 carbon atoms R3 is an alkylene radical having from one to 16 carbon atoms and n is a value from zero to 3, and wherein said rubber composition contains a coupling agent for said additional synthetic amorphous silica reinforcement filler.