Spherical ionomer particles and production thereof

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

167/325, 117/48.

C04B 28/28 (2006.01) A61K 6/083 (2006.01) A61L 24/00 (2006.01) A61L 24/12 (2006.01)

Patent

CA 2337533

The invention relates to spherical or approximately spherical ionomer particles, comprising an inner area and an outer area which contains silicon ions. The cations of said outer area comprise a) at least one element which can occupy lattice sites of the silicon in silicate compounds, producing a negative excess of charge and b) at least one element which is selected from the elements of the first and second main groups and those that can appear in a divalent form and which can compensate for the negative excess of charge. Suitable methods for producing the inventive particles are all those methods for producing spherical or approximately spherical particles from a suspension, dispersion, emulsion or similar and separating them from the surrounding solvent. Aerosol methods and especially, spray drying of suitable solutions, gels, sols or dispersions/suspensions can also be used. The inventive ionomer particles are especially suitable for use with acid- containing matrices as cements which can be used advantageously in dentistry for example.

L'invention concerne des particules sphériques ou approximativement sphériques d'ionomère comprenant une zone interne et une zone externe contenant des ions de silicium dont les cations contiennent (a) au moins un élément qui, dans les composés à silicate, peut occuper des places du réseau du silicium en générant une charge négative excessive; et (b) au moins un élément qui est choisi parmi les éléments du premier et du deuxième groupe principal ainsi que les éléments de forme bivalente, et qui peut compenser l'excédent de charge négative. Pour produire ces particules, on peut utiliser tous les procédés permettant de produire des particules sphériques ou approximativement sphériques à partir d'une suspension, d'une dispersion, d'une émulsion ou équivalent et de les séparer du solvant environnant. On peut également utiliser les procédés d'aérosols, notamment le séchage par pulvérisation de solutions adéquates, de gels, de sols ou de dispersions/suspensions. Les particules d'ionomère selon l'invention peuvent être utilisées notamment avec des matrices acidifères telles que les ciments avantageusement utilisés, par exemple, en dentisterie.

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