Patent ID: 6440397
Filing Date: 2002-08-27
Classification: A61K,A61Q

Abstract:
A silica abrasive composition comprising(a) silica gel (i) having a median particle size below about 7 microns, (ii) a pH of from about 6 to about 11, and (iii) a hardness defined by a powder RDA of 100 to 200, and a PCR of 100 to about 150 when said silica (a) is formulated by itself into a dentifrice paste; and (b) silica gel or precipitated silica having a median particle size of about 7 microns or greater and having a hardness defined by a powder RDA of about 50 to 180, and a PCR of about 80 to 105 when said silica (b) is formulated in a dentifrice paste; further wherein the weight ratio of (b) to (a) is at least 1:1.