IMPROVED SILICA PRODUCT FOR USE IN ELASTOMERS

摘要

A precipitated amorphous silica product particularly useful as a highly dispersible filler to elastomeric compounds, especially rubber passenger tire tread formulations. The invention has a CTAB specific surface area of about 10 m<2>/g to less than 140 m<2>/g; a multi-point BET surface area of about 50-225 m<2>/g; a 5 % pH value of about 5.0-8.5; a DBP oil absorption of about 160-310 cm<3>/100g; a linseed oil absorption of about 150-300 cm<3>/100g; a projected surface area of no greater than about 4000 nm<2>; and a pore volume ratio of pores ranging from 175 to 275 ANGSTROM in diameter to all pores less than 400 ANGSTROM in diameter of about 10 % to less than 50 %.