Precipitated silica

Details Precipitated silica Precipitated silica

C - Chemistry, Metallurgy

01

B

23/191, 400/7224

C01B 33/113 (2006.01) C08K 3/36 (2006.01) C09C 1/30 (2006.01)

Patent

CA 1117734

ABSTRACT OF THE DISCLOSURE The invention provides a hydrophobic precipitated silica, characterized by the following data - BET surface area according to DIN 66131, 110 ? 40 sqm/g; average size of the pri- mary particles as determined by EM photographs, 15 - 22 nm; loss on drying according to DIN 55921 after 2 hours at 105°C., <2.5%; loss on ignition (relative to the substance dried for 2 hours at 105°C) according to DIN 55921, 5.5 ? 1.5%; pH value (in a 5% aqueous-methanolic suspension) according to DIN 53200, 7.5 ? 1.0; conductivity (in a 4% aqueous-methanolic suspension) < 600 µS; bulk density of the non-ventilated material according to DIN 53194, 130 ? 40 g/litre; wettability with water, <0.1; carbon content, 2.5 ? 0.6%; water absorption at 30°C and 30% RH, 1.2 ? 0.4%; at 30°C and 70% RH, 1.5 ? 0.5%. The precipitated silica is useful as a reinforcing filler in elastomeric materials including seal- ing and cable compositions.

304984

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