A method of making abrasive compositions, and more particularly, it
relates to a method of making precipitated silica abrasive compositions
having excellent cleaning performance and lower abrasiveness with
post-reactor sizing of the abrasive particles being performed directly
via wet comminution and centrifugation, optionally followed by hydraulic
chamber press filtering combined with vacuum dewatering and
de-agglomeration is provided. By targeting a specific particle size
range, it has been determined that higher pellicle film cleaning levels
may be achieved without also increasing the dentin abrasion properties of
the silica products themselves. As a result, dentifrices including such
classified abrasive silica products, exhibiting particularly desirable
cleaning benefits, can be provided for improved tooth polishing,
whitening, and the like, without deleteriously affecting the hard tooth
surfaces. Also encompassed within this invention also are products of
this selective process scheme and dentifrices containing such
particularly manufactured and classified silica products.