Precipitated silica materials exhibiting high compatibility...

Details Precipitated silica materials exhibiting high compatibility... Precipitated silica materials exhibiting high compatibility...

2006-12-27

2008-10-21

Kishore, Gollamudi (Department: 1612)

Drug, bio-affecting and body treating compositions

Dentifrices

C424S687000, C423S220000, C423S419100

Reexamination Certificate

active

07438895

ABSTRACT:
Precipitated silica comprising porous silica particles having a cumulative surface area for all pores having diameters greater than 500 Å of less than 6 m2/g, as measured by mercury intrusion, and a percentage cetylpyridinium chloride (% CPC) Compatibility of greater than about 85%. 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 including the introduction of sodium sulfate powder during different process steps in order to enhance such a compatibility with CPC are provided.

REFERENCES:
patent: 2004/0161390 (2004-08-01), Gallis et al.

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