Silicas

Details Silicas Silicas

1990-10-29

1991-07-30

Chaudhuri, Olik

Drug, bio-affecting and body treating compositions

Dentifrices

A61K 716

Patent

active

050358790

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 m.sup.2 /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 R1 range from 1.444 to 1.460.

REFERENCES:
patent: 3977893 (1976-08-01), Wason
patent: 4294894 (1981-10-01), Vellucci
patent: 4612189 (1986-09-01), Oyobe et al.

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