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US 3,939,262 AGranted
Dentifrices
AssigneeMonsanto Company
InventorKeun Y. Kim
Life of this patent
Estimating the term…
Abstract
Dental creams, particularly translucent dental creams, containing finely divided synthetic amorphous silica polishing agents, such polishing agents have an average refractive index of from about 1.410 to 1.440.
Claims6
A translucent dental cream comprising
- 1. a solid phase comprising about 95 to 100% by weight, based on the total weight of the solid phase, as a polishing agent a synthetic amorphous silica prepared by exchanging hydrogen for the alkali metal ion of a particulate alkali metal silicate having an SiO.sub.2 /M.sub.2 O ratio of from about 1.6 to about 3.75 and containing 10 to 25% by weight of water, said polishing agent having an average refractive index of from about 1.410 to 1.440 and an average particle diameter of from about 1 to about 30 microns, and
- 2. a liquid phase comprising water and a polyhydric alcohol humectant, the refractive index of said liquid phase being essentially the same as the refractive index of said solid phase.
A translucent dental cream comprising
- 1. a solid phase consisting essentially of from about 95 to about 100% by weight, based on the total weight of the solid phase of a finely divided synthetic amorphous silica polishing agent prepared by exchanging hydrogen for the alkali metal ion of a particulate alkali metal silicate having an SiO.sub.2 /M.sub.2 O ratio of from about 1.6 to about 3.75 and containing 10 to 25% by weight of water, said polishing agent having an average refractive index from about 1.420 to 1.435 and an average particle diameter from about 3 to about 20 microns, and
- 2. a liquid phase consisting essentially of water and a polyhydric alcohol humectant, the ratio of said humectant in said water being such that the refractive index of said liquid phase essentially matches the refractive index of said solid phase.
Dependencies are inferred from the claim text.