ORGANOSILICON COMPOSITIONS CONTAINING PRECIPITATED SILICA WITH PARTICULAR REINFORCING PROPERTIES

摘要

Mechanically/thermally improved, filler reinforced organosilicic elastomers, e.g., organopolysiloxanes, are comprised of a reinforcing amount of precipitated silica particulates having the properties: -(i) BET surface area 190 to 340 m2/g -(ii) CTAB surface area 180 to 280 m2/g - -(iii) IMAGE 0.9 to 1.2 - -(iv) Residual sodium content 500 ppm -(v) pH 3.5 to 6.0 -(vi) Specific volume Vo 4.2 -(vii) Amount of particles of 0.05% - a size as will not pass - through a 45 mu mesh sieve -