Silicic acid preparation

Details Silicic acid preparation Silicic acid preparation

C - Chemistry, Metallurgy

01

B

23/192, 6/212, 4

C01B 33/12 (2006.01) C01B 33/193 (2006.01) C08K 3/34 (2006.01) C08K 3/36 (2006.01) C08L 83/04 (2006.01) C09C 1/30 (2006.01)

Patent

CA 1109640

ABSTRACT OF THE DISCLOSURE The present invention provides a hydrophobized silicic acid having the following characteristics BET surface area acc. to DIN 66 131 m2/g 110 ? 30 Mean size of primary particles from EM records nm 15 - 22 Loss on drying acc. to DIN 55 921 after 2 hrs at 105° C % <2.5 Loss on ignition (referred to substance dried 2 hrs at 105°C) acc. to DIN 55 921 % 5.5? 1.5 pH value (in 5 % aqueous dispersion) acc. to DIN 53 200 7 ? 1 Conductivity (in 4% aqueous dispersion) µS <600 Tamped density of deaerated substance acc. to DIN 53 194 g/l 50 ? 20 Water wetability <0.05 Carbon content % 2.5 ? 0.6 Water intake at 30° C and 30 % rel.hum. % 1.2 ? 0.4 at 30° C and 70 % % 1.5 ? 0.5 DBP intake % 260 ? 30 Such a precipitate is useful as a reinforcing filler in hardenable elastomeric forming materials.

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