Solubilizing and/or dispersant compounds, preparation process and compositions containing them

A method for cosmetic and dermopharmaceutical treatment of keratinous materials, comprising applying to the keratinous materials a composition comprising as an active ingredient compounds selected from the group consisting of:

• (a) compounds of the formula ##STR21## wherein R.sub.1 and R.sub.2, which are identical or different, denote a methyl or ethyl radical;
• R.sub.3 denotes a methyl, ethyl or hydroxyethyl radical;
• A denotes a ##STR22## radical or ##STR23## R denotes a hydrogen atom or a methyl radical;
• X.sup.- denotes Cl.sup.-, Br.sup.-, I.sup.-, CH.sub.3 OSO.sub.3.sup.-, CH.sub.3 SO.sub.3.sup.-, CH.sub.3 -- --SO.sub.3.sup.- or C.sub.2 H.sub.5 OSO.sub.3.sup.- ;
• p and q, which are identical or different, denote integers such that 1.ltoreq.p.ltoreq.15, 0.ltoreq.q.ltoreq.13 and 2.ltoreq.p+q.ltoreq.20;
• n denotes an integer equal to 2 or 3;
• m denotes 0 or 1, and m+q.noteq.0;
• and
• (b) salts of such compounds obtained from neutralization by bases.

A method for solubilizing or dispersing aqueous and aqueous-alcoholic solutions, comprising adding to the aqueous or aqueous-alcoholic solution an effective amount of compounds selected from the group consisting of:

• (a) compounds of the formula ##STR24## in which:
• R.sub.1 and R.sub.2, which are identical or different, denote a methyl or ethyl radical;
• R.sub.3 denotes a methyl, ethyl or hydroxyethyl radical;
• A denotes a ##STR25## radical or ##STR26## R denotes a hydrogen atom or a methyl radical;
• X denotes Cl.sup.-, Br.sup.-, I.sup.-, CH.sub.3 OSO.sub.3.sup.-, CH.sub.3 SO.sub.3.sup.-, CH.sub.3 -- --SO.sub.3.sup.- or C.sub.2 H.sub.5 OSO.sub.3.sup.- ;
• p and q, which are identical or different, denote integers such that 1.ltoreq.p.ltoreq.15, 0.ltoreq.q.ltoreq.13 and 2.ltoreq.p+q.ltoreq.20;
• n denotes an integer equal to 2 or 3;
• m denotes 0 or 1, and m+q.noteq.0;
• and
• (b) salts of such compounds obtained from neutralization by bases.

A method for cosmetic treatment of hair, nails or skin, comprising the step of applying to the hair, nails or skin a composition selected from the group consisting of an aqueous composition and an aqueous-alcoholic composition, wherein the compositions further comprise as an active ingredient compounds selected from the group consisting of:

• (a) at least one compound of formula ##STR27## in which:
• R.sub.1 and R.sub.2, which are identical or different, denote a methyl or ethyl radical;
• R.sub.3 denotes a methyl, ethyl or hydroxyethyl radical;
• A denotes a ##STR28## radical or ##STR29## R denotes a hydrogen atom or a methyl radical;
• X.sup.- denotes Cl.sup.-, Br.sup.-, I.sup.-, CH.sub.3 OSO.sub.3.sup.-, CH.sub.3 SO.sub.3.sup.-, CH.sub.3 -- --SO.sub.3.sup.- or C.sub.2 H.sub.5 OSO.sub.3.sup.- ;
• p and q, which are identical or different, denote integers such that 1.ltoreq.p.ltoreq.15, 0.ltoreq.q.ltoreq.13 and 2.ltoreq.p+q.ltoreq.20;
• n denotes an integer equal to 2 or 3;
• m denotes 0 or 1, and m+q.noteq.0;
• and
• (b) salts of such compounds obtained from neutralization by bases.