Silanized silica

Details Silanized silica Silanized silica

C - Chemistry, Metallurgy

01

B

C01B 33/18 (2006.01) C08K 3/36 (2006.01) C08K 9/06 (2006.01) C09C 1/30 (2006.01) C09C 3/12 (2006.01) C09D 7/00 (2006.01) C09G 1/00 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2203726

The present invention provides a silanized pyrogenically- produced silica with the following physico-chemical properties: Specific surface area m2/g 80 - 400 Primary particle size nm 7 - 40 Tamped density g/l 50 - 300 pH value 3 - 10 Carbon content % 0.1 - 15 DBP number % < 200. The invention also provides a method of producing the above silanized pyrogenically-produced silica, comprising spraying pyrogenically-produced silica in a mixing container under intensive mixing, first with water or dilute acid and then with hexamethyldisilazane, mixing for 15 to 30 minutes, and tempering at a temperature of 100 to 400°C for a period of 1 to 6 h.

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