High cleaning silica gel dental abrasive, dentifrices...

Details High cleaning silica gel dental abrasive, dentifrices... High cleaning silica gel dental abrasive, dentifrices...

2005-05-24

2005-05-24

Krass, Frederick F. (Department: 1614)

Drug, bio-affecting and body treating compositions

Dentifrices

C423S335000, C423S338000, C423S339000, C516S102000, C516S111000, C051S308000

Reexamination Certificate

active

06896876

ABSTRACT:
A silica gel abrasive having good cleaning and low abrasion is prepared by combining at least two silica gels before adjusting the pH of the abrasive to a pH in the range of 3-6. One of the gels is washed at relatively lower temperature compared to the wash temperature of a second gel. The two gels are then milled and dried to a median particle size in the range of 5 to 12 microns. The volatiles content of the gel combination is in the range of 20-40% by weight. The resulting mixtures have low abrasion as measured by Einlehner, e.g., in the range of 0.5 to 3 when measured using a brass screen. A dentifrice composition comprising 10 to 25% of the abrasive has a PCR of at least 80 and can obtain PCR's greater than 100.

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patent: 6416744 (2002-07-01), Robinson et al.
patent: WO 9951196 (1999-10-01), None

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