ULTRAFINE MINERAL POWDER COMPRISING MELANIC PIGMENTS, PROCESS FOR ITS PREPARATION AND ITS USE IN COSMETICS

摘要

abbreviated descriptionthe invention relates to a powder consisting ofinert mineral particles having a particle size less than.more than 20 microns, comprising on the surface anmelanistic pigment produced by the oxidation of at least oneindole dye of the formula:(i)in which:r1 represents a hydrogen atom, a group ofthe lower alkyl group or a sir9r10r11.r2 and r3 are identical or different, represent.hydrogen atom, lower alkyl group, or a.of a carboxyl group, a group alcoxycarbonyleless than or coosir9r10r11 group.r4 and r5 are same or different one.hydrogen atom, alkyl group, or a linear time.c1 - c20 on a formyl group, an acyl groupin c2 to c20 linear or branched, alcenoyle in a groupc3 - c20 linear or branched, a sir9r10r11 group.a group of - p (o) (or6) 2, as a group, or r4 r6oso2and r5, in conjunction with the oxygen atoms ofthey are attached, form a ring containing possible.a carbonyl group and a methylene groupoptionally substituted, or a thiocarbonyl groupa group:or;r6 and r7 represents a hydrogen atom or alower alkyl group, r8 represents a collectionlower alkoxy, dialkylamino group or a mono - or.r9, r10 and r11, identical or different, representlinear and branched alkyl groups or lower.one of its salts with mineral acids or additionor organic alkali salts, alkaline earth orthe corresponding amines. the powder according to the invention isdesigned to be used for colouringhair and make-up, hair and skin.