Precipitated silica

Details Precipitated silica Precipitated silica

C - Chemistry, Metallurgy

01

B

C01B 33/18 (2006.01) C01B 33/193 (2006.01) C09C 1/28 (2006.01) C09C 1/30 (2006.01) C09C 3/00 (2006.01) C09D 7/00 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2255456

Precipitated silica which has the following physico-chemical parameters: BET surface area (DIN 66131) in m2/g 400 - 600 DBP index (DIN 53601) in g/100 g 300 - 360 Compacted density (DIN 53194) in g/l 70 - 140 Grindometer value (ISO 1524) in µm 15 - 50 Size distribution index I < 1.0 measured with a Malvern intrument Size distribution index I = Image It is prepared by milling a precipitated silica in a classifier mill or a fluidised bed counter-flow mill. A polyethylene wax emulsion may be added before the milling procedure. The precipitated silica then has the following physico-chemical parameters: BET surface area (DIN 66131) in m2/g 351 - 600 DBP index (DIN 53601) as a % 300 - 360 Carbon content as a % 1 - 8 Compacted density (DIN 53194) in g/l 70 - 140 Grindometer value (ISO 1524) in µm 15 - 50 Size distribution index I < 1.0 The precipitated silicas may be used as matting agents in lacquer systems.

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