Drug – bio-affecting and body treating compositions – Dentifrices
Patent
1980-09-11
1982-08-24
Rose, Shep K.
Drug, bio-affecting and body treating compositions
Dentifrices
A61K 716
Patent
active
043460712
ABSTRACT:
Silicas that provide improved abrasive action when incorporated in dentifrice compositions can be prepared by dehydrating a silica hydrogel to a low water content and then reintroducing water to gel. The silica hydrogel is prepared by neutralizing a sodium silicate with an acid. This hydrogel is dried by any convenient method so that the gel contains about 15% water or less. This dried gel is rehydrated to about 30% or more. The rehydrated gel provides improved abrasion values over the prior art xerogels and hydrogels.
REFERENCES:
patent: 4153680 (1979-05-01), Seybert
Dent Anthony L.
Derolf M. Robert
Hertzenberg Elliot P.
Bobb J. S. Stephen
Philpitt Fred C.
Posner Ernest G.
PQ Corporation
Rose Shep K.
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