Cosmetics containing thermally-inhibited starches

A - Human Necessities – 61 – K

Patent

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Details

A61K 8/73 (2006.01) A61K 8/97 (2006.01) A61Q 1/10 (2006.01) A61Q 5/00 (2006.01) A61Q 19/00 (2006.01)

Patent

CA 2210160

Thermally-inhibited starches and flours are used in cosmetic compositions such as skin and hair care products as emulsifiers, thickeners, and aesthetic control agents. The starch or flour is inhibited by dehydrating the starch or flour to anhydrous or substantially anhydrous and then heat treating the dehydrated starch or flour for a time and at a temperature sufficient to inhibit the starch or flour and improve its viscosity stability when dispersed in water. The dehydration may be a thermal or a non-thermal dehydration (e.g., by alcohol extraction or freeze-drying). Preferably, the pH of the starch or flour is adjusted to a neutral or above (e.g., pH 8-9.5) prior to the dehydration and heat treatment.

Des amidons et des farines inhibés thermiquement sont utilisés dans des compositions cosmétiques, telles que des produits de soin pour la peau et les cheveux, comme émulsifiants, épaississants et agents de modification esthétique. L'amidon ou farine est inhibé par déshydratation jusqu'à ce qu'il devienne anhydre ou pratiquement anhydre, puis un traitement thermique de l'amidon ou farine déshydraté est effectué sur une durée et à une température suffisantes pour inhiber celui-ci et améliorer la stabilité de sa viscosité lorsqu'il est dispersé dans l'eau. La déshydratation peut être thermique ou non thermique (p.ex., par extraction d'alcool ou lyophilisation). De préférence, le pH de l'amidon ou farine est ajusté à un niveau neutre ou supérieur (p.ex., un pH compris entre 8 et 9,5) avant la déshydratation et le traitement thermique.

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