Transparent dentifrices
AssigneeJ. M. Huber Corporation
InventorsRajeev B. Karpe, Sunil S. Nadkarni, Ramanathan Ramakrishnan, John A. Kostinko
Life of this patent
Estimating the term…
Abstract
An abrasive, amorphous precipitated silica is provided that provides excellent abrasive performance, but also has a relatively high degree of transmittance, and an index of refraction that is sufficiently low to allow it to be a component of a transparent toothpaste composition having a relatively high concentration of water. The amorphous precipitated silica composition has a refractive index of less than about 1.4387, a light transmittance of greater than about 48%; and a Brass Einlehner abrasion value of greater than about 5 mg loss/100,000 rev. A dentifrice having a haze value of less than about 70 may be prepared using this abrasive, amorphous silica.
Claims6
A transparent dentifrice comprising:
- about 13 wt % to about 20 wt % water;
- an abrasive, precipitated silica having:
- a refractive index of less than about 1.4387;
- a light transmittance of greater than about 48%;
- and
- a Brass Einlehner abrasion value of greater than about 5 mg loss/100,000 rev.;
- wherein the dentifrice has:
- a haze value of less than about 70;
- a refractive index of less than about 1.442;
- and
- an RDA of about 50 to 150.
A dentifrice comprising:
- a) a premix consisting essentially of a non-silica thickening agent, deionized water, and a humetctant selected form the group consisting of glycerin, sorbitol, and polyethylene glycol;
- wherein the premix has a refractive index of less than 1.442;
- and
- b) about 0.01 wt % to about 10 wt % abrasive, precipitated silica, having:
- a refractive index of less than about 1.4387;
- a light transmittance of greater than about 481%;
- and
- a Brass Einlehner abrasion value of greater than about 5 mg loss/100,000 rev;
- wherein the dentifrice has an RDA of greater than about 50, a refractive index of less than about 1.442;
- and a haze value of less than about 70.
A method of preparing a dentifrice comprising the steps of:
- a) preparing a premix, the premix containing no silica and having a refractive index of less than about 1.442;
- and
- b) mixing the premix with an abrasive, precipitated silica, having;
- a refractive index of less than) about 1.4387;
- a light transmittance of greater than about 48%;
- and
- a Brass Einlehner abrasion value of greater than about 5 mg loss/100,000 rev., to form a dentifrice having an RDA of greater than about 50, a refractive index of less than about 1.442, and a haze value of less than about 70.
Dependencies are inferred from the claim text.