Silicas

Details Silicas Silicas

C - Chemistry, Metallurgy

01

B

23/194

C01B 33/193 (2006.01) A61K 8/25 (2006.01) A61Q 11/00 (2006.01)

Patent

CA 1307647

R.3035 ABSTRACT Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m2/g, a weight mean particle size of 5 to 20 micron, a perspex abrasion value of 15 to 28, a mean pore diameter from 3 to 8 nm and a transmission of at least 70% in the Rl range from 1.444 to 1.460. * * * * *

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