Hollow silica particles, compositions comprising them, and...

A - Human Necessities – 61 – K

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A61K 8/25 (2006.01) C01B 33/18 (2006.01)

Patent

CA 2618067

Methods for making and compositions comprising hollow silica particle are disclosed, said particles made from a composition comprising a silicon- containing compound selected from the group consisting of tetraalkoxysilanes, trialkyloxysilanes and derivatives thereof, dialkoxysilanes and derivatives thereof, alkoxysilanes and derivatives thereof, silicone oligomers, oligomeric silsesquioxanes and silicone polymers distributed over a polymer template core that is eliminated from the particle. The particles of the present invention have a substantially uniform particle size and exhibit low permeability to liquids.

L'invention concerne des méthodes pour fabriquer des compositions comprenant des particules de silice creuses, et des compositions ainsi fabriquées. Les particules de l'invention sont constituées d'une composition comprenant une composé contenant du silicium sélectionné dans le groupe comprenant: des tétraalkoxysilanes, des trialkyloxysilanes et des dérivés de ceux-ci, des dialkoxysilanes et des dérivés de ceux-ci, des alkoxysilanes et des dérivés de ceux-ci, des oligomères de silicone, des silsesquioxanes oligomères et des polymères de silicone distribués sur un noyau de modèle de polymère qui est éliminé à partir des particules. Les particules de l'invention présentent une taille particulaire sensiblement uniforme et présentent une faible perméabilité aux liquides.

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