Diffusing particles based on organogelling xerogel fibers,...

A - Human Necessities – 61 – K

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A61K 8/60 (2006.01) A61K 8/11 (2006.01) A61Q 1/00 (2006.01) A61Q 19/08 (2006.01)

Patent

CA 2624421

The invention concerns particles consisting essentially of fibers of an organogelling substance in the form of xerogel (dry gel), the fibers being essentially oriented in a common direction and randomly aligned around the longest fiber. The organogelling substance is preferably 1,3: 2,4-di-O-benzylidene-D-sorbitol. Said particles, which are in the form of spindles, have interesting optical properties; they have a total light transmittance higher than 0.80, with a diffuse transmittance higher than the specular transmittance. The invention also concerns a method for preparing said particles by solvent evaporation process, by solvent diffusion/evaporation process or by shearing process. The invention finally concerns active particles consisting of said particles whereon is immobilized a dermocosmetically active principle, a dermocosmetic composition comprising said particles or said active particles and a cosmetic treatment method which consists in applying on the skin said dermocosmetic composition.

L'invention a pour objet des particules essentiellement constituées de fibres d'une substance organogélifiante sous forme de xérogel (gel sec), les fibres étant essentiellement orientées dans une même direction et alignées aléatoirement autour de la fibre la plus longue. La substance organogélifiante est de préférence le 1,3: 2,4-di-O-benzylidène-D-sorbitol. Ces particules, qui sont sous la forme de fuseaux, présentent des propriétés optiques intéressantes; elles ont un facteur de transmission totale de la lumière supérieure à 0,80, avec un facteur de transmission diffuse supérieur au facteur de transmission spéculaire. L'invention a également pour objet un procédé de préparation de ces particules par la technique d'évaporation de solvant, par la technique de diffusion/évaporation de solvant ou par un procédé avec cisaillement. L'invention concerne enfin des particules actives constituées de ces particules sur lesquelles un principe dermo-cosmétiquement actif est immobilisé, une composition dermo-cosmétique comprenant ces particules ou ces particules actives et une méthode de traitement cosmétique consistant à appliquer sur la peau cette composition dermo-cosmétique.

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