Product based on inorganic or organic lamellar particles, containing a melanotic pigment, process for preparing it and its use in cosmetics
AssigneeL'oreal
InventorsHerve Andrean, Alex Junino
Life of this patent
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Abstract
The invention relates to a product in powder form consisting of organic or inorganic particles having a lamellar structure, having a size of less than 50 microns and containing at least one synthetic melanotic pigment formed in situ by oxidation of an indole compound, and to its use for the protection of the human epidermis, in make-up products and for dyeing hair.
Claims23
A product in the form of a powder consisting of organic or inorganic particles having a lamellar structure and a size less than 50 microns, said particles containing at least one synthetic melanotic pigment formed in situ by oxidation of an indole compound, wherein said indole compound has the formula ##STR2## wherein R.sub.1 and R.sub.3, each independently, represent hydrogen or C.sub.1 -C.sub.4 alkyl;
- R.sub.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, carboxyl or (C.sub.1 -C.sub.4) alkoxycarbonyl;
- R.sub.4 and R.sub.7, each independently, represent hydrogen, hydroxyl, C.sub.1 -C.sub.4 alkyl, amino, (C.sub.1 -C.sub.4) alkoxy, (C.sub.2 -C.sub.14) acyloxy or (C.sub.2 -C.sub.4) acylamino;
- R.sub.5 represents hydrogen, hydroxyl, (C.sub.1 -C.sub.4) alkoxy, (C.sub.1 -C.sub.4) alkyl, halogen, amino, (C.sub.2 -C.sub.4) acyloxy, (C.sub.2 -C.sub.4) acylamino or trimethylsilyloxy;
- R.sub.6 represents hydrogen, hydroxyl, (C.sub.1 -C.sub.4) alkoxy, amino, (C.sub.2 -C.sub.4) acyloxy, (C.sub.2 -C.sub.4) acylamino, trimethylsilyloxy or hydroxy (C.sub.2 -C.sub.4) alkylamino;
- or R.sub.5 and R.sub.6, together with the carbon atoms to which they are attached, form a methylenedioxy ring optionally substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or a carbonyldioxy ring;
- at least one of R.sub.4 to R.sub.7 represents OZ or NHR and at most one of R.sub.4 to R.sub.7 represents NHR;
- and
- at most two of R.sub.4 to R.sub.7 represent OZ, said OZ groups being in the 5- and 6- positions when Z represents hydrogen, and at least one of R.sub.4 to R.sub.7 represents hydrogen and, in this case, if only one of R.sub.4 to R.sub.7 represents hydrogen, only one of R.sub.4 to R.sub.7 represents NHR or OZ, the remainder representing C.sub.1 -C.sub.4 alkyl;
- and wherein R in said NHR represents hydrogen, C.sub.2 -C.sub.4 acyl or C.sub.2 -C.sub.4 hydroxyalkyl and Z in said OZ represents hydrogen, C.sub.2 -C.sub.14 acyl, C.sub.1 -C.sub.4 alkyl or trimethylsilyl;
- or a corresponding salt of said indole compound of formula I.
A cosmetic composition comprising in a cosmetically acceptable medium a product in the form of a powder consisting of organic or inorganic particles having a lamellar structure and a size less than 50 microns, said particles containing at least one synthetic melanotic pigment formed in situ by oxidation of an indole compound, said product being present in an amount ranging from 0.1 to 35 percent by weight based on the total weight of said composition.
Dependencies are inferred from the claim text.