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United States Patent 7,332,150 Silber , et al. February 19, 2008

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Abrasive component for a cleaning agent in a cleaning product intended for use on delicate surfaces, especially on teeth

KerrHawe S.A. (Bioggio, CH)

Summary

A material is proposed as an essential abrasive component for cleaning agents in cleaning products for delicate surfaces which is essentially composed of platelets. These platelets are preferably shaped without sharp points, i.e. their circumference is similar to a polygon whose corners do not show angles that are in the majority smaller than 30o and greater than 330o. Glass flakes are for example such a material. The abrasive component of the invention may for example be used for the manufacture of toothpastes and prophylaxis pastes that are efficient but nevertheless not harmful to teeth.

Thus, the abrasive component of the invention distinguishes itself by being essentially composed of approximately plate-shaped particles whose sizes vary as little as possible and/or which have a periphery showing only few sharp points: Their shape thus approximates that of a polygon whose corners do not exhibit angles greater than 33o nor smaller than 30o. It is necessary that the edges are absolutely straight, they are, however, preferably straight.

The abrasive material according to the invention may be included in the cleaning agent in a cleaning product. In the context of the description, as a cleaning agent, it is understood the totality of components, which show a cleaning action, of a cleaning product, i. e. beside abrasive materials also surfactants etc. As an abrasive component of a cleaning agent, the totality of materials is understood which show abrasive action and are included in the abrasive component.

Having recognized the advantage of the plate shape, the application has found appropriate synthetic materials. Glass flakes proved best suited. They are a synthetically manufactured material whose properties are essentially adjustable and controllable.

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FIG. 1 is a micrograph of glass flakes used as an abrasive component according to an embodiment of the present invention.

Formulation Example 1 – Toothpaste

Component Proportion (weight %) Aqueous liquid containing water and 35 to 95% glycerol, sorbitol, disaccharide syrup, etc. Sweetening agent 0.1 to 0.5% Organic thickening agent 0 to 3% Polyethylene glycol 0 to 6% Preserving agent, fluoride compounds, 0.5 to 12% Coloring agents and flavoring agents, pigments Tenside mixture of sodium laurylsulfate, 2 to 5% sodium laurylsarcosinate and a sodium tauride Glass flakes RCF-160 0.01 to 60% Pyrogenic silicic acid, hydrophilic 1 to 3% Total 100%

Formulation Example 2 – Prophylaxis Paste

Component Proportion (weight %) Flavoring agent 2 Cetyl alcohol 3 Emulsifier (Emulgin R040, Henkel, 3 Germany) Coloring agent (red iron oxide) 1.7 Sodium fluoride 2.8 Glass flakes (RCF-160) 40 Polyethylene glycol (Macrogol 400) 43 Sweetening agent (Aspartame®) 1 Titanium dioxide 2 Gel forming agent (Tego Carbomer 1.5 141, Goldschmidt AG, Germany) Total 100

Laboratory Needs:

Formulation: Pyrex glass beakers , heat insulated gloves, safety goggles, pH indicator paper or probe, spatulas, storage jars, aluminum foil and untreated virgin hair tresses.

Laboratory Equipment: A mechanical agitator with support and fastener, mixing blades to fit inside the diameter of the glass beaker, thermometer and hot plate with temperature control, top load balance with auto calibration and tare.

A mechanical agitator Mixing blades Thermometer and hot plate top load balance

Viscometer pH Meter

Warning: Read the material safety data sheets, MSDS, of all formulation ingredients to determine special handling precautions. Prepare this formulation in a well ventilated laboratory:

 This formulation may require handling heated or corrosive liquids and severe burning may occur.  Do not breath fumes  Wear gloves and goggles

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This document was prepared by Formula Scan. Its reproduction in any type of form or format is strictly prohibited without the written consent of Formula Scan