Dentifrice

Details Dentifrice Dentifrice

A - Human Necessities

61

K

167/320.7

A61K 8/25 (2006.01) A61Q 11/00 (2006.01)

Patent

CA 1182050

ABSTRACT OF THE DISCLOSURE The present invention provides dentifrices having im- proved storage life with regard to rheology and abrasiveness and containing as cleaning agents for the first time bifunctional pre- cipitated silicas (acting as thickeners and abrasives). These precipitated silicas are characterized by the following physico- chemical characteristic data: Bowl mill Micronizer BET surface area sqm/g 15-110 15-110 Tamped powder density g/l 150-750 90-650 Secondary particle size dis- tribution curve as determin- ed by the Coulter counter Fig. 1 Fig. 2 "ALPINE" retained on sieve >63 µm % by weight <1.5 <0.1 Cu abrasion in a 10% glycer- ine dispersion mg 5-30 5-30 Bright reference value A % 86-96 90-96 Viscosity in a 30% glycer- ine-water dispersion (1:1) Brookfield RTV Sp 5 mPas 30000-60000 30000-60000 From 0.5 to 5% by weight of polyethylene glycol or 2 to 14% by weight of a precipitated silica, which has a viscosity of at least 30000 mPas in a 15% glycerine-water dispersion, can be added additionally to the dentifrices. Pyrogenic silicas can also be used with good results for regulating the viscosity.

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