Precipitated silica product, dentifrices containing same,...

Details Precipitated silica product, dentifrices containing same,... Precipitated silica product, dentifrices containing same,...

2007-08-14

2007-08-14

Krass, Frederick (Department: 1614)

Drug, bio-affecting and body treating compositions

Dentifrices

Ammonia, amine, or derivative thereof

C424S049000, C424S052000, C516S082000, C516S113000, C423S335000, C423S339000, C051S308000

Reexamination Certificate

active

10677294

ABSTRACT:
Precipitated silica comprising porous silica particles having a cumulative surface area for all pores having diameters greater than 500 Å of less than 8 m2/g, as measured by mercury intrusion, and a percentage cetylpyridinium chloride (% CPC) Compatibility of greater than about 55%. The precipitated silica product is especially well-adapted for use in dentifrices containing cetylpyridinium chloride, which do not attach to the low surface area silica product in a meaningful level and thus remain available for antimicrobial action. Processes for making the silica product are also provided.

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