Patent ID: 6686409
Filing Date: 2004-02-03
Classification: C01P,C08K,C09C,Y02T

Abstract:
An elastomeric composition comprising:at least one elastomer; an aggregate; and optionally a coupling agent wherein said aggregate comprises a carbon phase and a silicon-containing species phase, wherein said aggregate is characterized by at least one of the following characteristics: a) a difference between BET (N2) surface area and t-area of from about 2 to about 100 m2/g; b) a difference between BET (N2) surface area and t-area of from about 1 to about 50 m2/g after HF treatment; c) a ratio of from about 0.1 to about 10 based on 1) the difference in BET (N2) surface area between the aggregate after and before HF treatment to 2) weight percentages of silicon content in said aggregate without HF treatment; d) a weight average aggregate size measured by DCP after HF treatment is reduced by about 5% to about 40% compared to weight average aggregate size without HF treatment; e) a silica ash content in said aggregate of from about 0.05% to about 1% based on the weight of said aggregate after HF treatment and based on ash resulting from silicon-containing compound; and f) a BET surface area of silica ash in said aggregate of from about 200 m2/g to about 700 m2/g, wherein the silicon-containing species phase is present primarily at the surface of the aggregate.