Silicon for toothpaste compositions compatible with metal...

C - Chemistry – Metallurgy – 01 – B

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167/320.7

C01B 33/193 (2006.01) A61K 8/25 (2006.01) A61Q 11/00 (2006.01) C01B 33/154 (2006.01)

Patent

CA 2015921

The invention relates to a silica compatible with metal cations: zinc, tin, strontium and others. The silica of the invention is particularly well suited to the preparation of toothpaste compositions containing the said cations. One preparation process consists in reacting a silicate with an acid, producing a silica suspension or gel. An initial curing is carried out at a pH of greater than or equal to 6 and less than or equal to 8.5, followed by a second curing at a pH of less than or equal to 5Ø The silica is separated and submitted to hot-water washing until an aqueous suspension is produced, the pH of which measured on a suspension at 20% SiO2 is determined by the following equation: pH = d - c log (D). It is then dried. In the equation, c is a constant less than or equal to 1.0; d is a constant less than or equal to 8.5. (D) represents the electrical conductivity of the aqueous silica suspension expressed in microsiemens/cm.

PRECIS DE LA DIVULGATION L'invention concerne une silice compatible avec les cations métalliques: zinc, étain, strontium et autres. La silice de l'invention convient particulièrement bien à la préparation de compositions pour dentifrice contenant lesdits cations. Un procédé de préparation consiste à faire réagir un silicate avec un acide conduisant ainsi à une suspension ou un gel de silice. On effectue un premier mûrissement à un pH: 5 ? pH ? 8.5, puis un deuxième mûrissement à un pH ? 5,0. On sépare la silice;; on la soumet à un lavage à l'eau chaude jusqu'à ce que le procédé conduise à une suspension aqueuse dont le pH mesuré sur une suspension à 20% de SiO2 réponde à l'équation suivante:-pH = d - c log (D), puis on sèche. Dans l'équation c est une constante inférieure ou égale à 1,0. d est une constante inférieure ou égale à 8,5. (D) représente la conductivité électrique de la suspension aqueuse de silice exprimée en microsiemens.cm.

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