Amorphous silicas suitable for transparent toothpastes

Details Amorphous silicas suitable for transparent toothpastes Amorphous silicas suitable for transparent toothpastes

C - Chemistry, Metallurgy

01

B

C01B 33/193 (2006.01) A61K 8/25 (2006.01) A61Q 11/00 (2006.01) A61K 7/16 (1995.01)

Patent

CA 2146997

Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surfact area of 10 to 90 m2/g, a weight mean particle size of 5 to 15 micron, and a plastics abrasion value of 16 to 26 a transmission of at least 70 % in the RI range from 1.430 to 1.443 and an oil absorbtion in the range from about 70 to about 150 cm3/ 100 g.

On peut préparer par précipitation des silices amorphes convenant pour une utilisation comme abrasif dans des pâtes dentifrices transparentes. Ces silices se distinguent par le fait qu'elles ont une surface BET de 10 à 90 m2/g,une granulométrie moyenne allant de 5 à 15 microns, une valeur d'abrasion de plastique de 16 à 26, une transmission d'au moins 70 % dans la plage des indices de réfraction allant de 1,430 à 1,443 et une absorption d'huile dans la plage allant d'environ 70 à 150 cm3/100 g.

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