High-cleaning, low abrasion, high brightness silica materials for dentrifices

Abstract

Unique abrasive materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial, particularly simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels. Such a result thus accords the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Furthermore, the produced abrasive materials also exhibit very high and desirable brightness properties that permit easy incorporation and utilization within dentifrices for aesthetic purposes. Encompassed within this invention is a unique method for making such gel / precipitated silica composite materials for such a purpose, particularly under high shear conditions, as well as the different materials within the structure ranges described above and dentifrices comprising such.

Description

FIELD OF THE INVENTION [0001] This invention relates to unique abrasive materials that are in situ generated compositions of precipitated silicas and silica gels. Such compositions exhibit different beneficial, particularly simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels. Such a result thus accords the user a dentifrice that effectively cleans tooth surfaces while controlling the amount of abrasion applied to the surfaces of the subject teeth. Furthermore, the produced abrasive materials also exhibit very high and desirable brightness properties that permit easy incorporation and utilization within dentifrices for aesthetic purposes. Encompassed within this invention is a unique method for making such gel / precipitated silica composite materials for such a purpose, particularly under high shear conditions, as well as the different materials within the structure ranges described above and dentifrices comprising such. BACKGROUND OF THE PRIOR AR...

AI Technical Summary

Benefits of technology

The present invention provides a method for producing a precipitated silica and gel silica composite material that can simultaneously and in situ produce targeted amounts of silica gels and precipitated silicas with controlled structure. This allows for the production of materials that exhibit excellent dentin abrasion and pellicle film cleaning properties in dentifrice formulations. The method involves the sequential steps of forming a silica gel composition, treating it under high shear conditions, and introducing an alkali silicate and acidulating agent to produce a precipitate / gel silica combination. The resulting composite material has high brightness and low abrasion levels, making it a desirable option for dentifrice producers. The invention also provides a new method for the production of such materials, which allows for proper ratios of the two silica materials to be made during production.

Problems solved by technology

As will be discussed in greater detail below, the physically mixed combination of such materials (i.e., not simultaneously produced within the same reaction) has been found to impart limited levels of such properties, namely the need to provide materials (particularly a precipitated silica component) that exhibits an extremely high, potentially deleterious dentin abrasion level in order to impart, at the same time, an acceptable high pellicle film cleaning level.

In such a manner, it has been found that although the pellicle film cleaning level is quite high, in fact the resultant dentin abrasion level is limited, thereby imparting an excellent cleaning material without also imparting too high an abrasion level to the target dental substrate.

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