Cosmetic or pharmaceutical compositions comprising homopolymers and salts thereof

A moisturizer and/or emollient for a substance chosen from skin, mucous membranes and keratin fibres, comprising at least one material chosen from homopolymers and salts thereof of formula (I):

• 12
• in which:
• X is chosen from —O—, —S— and —NR, wherein R is chosen from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals,
• R1 is chosen from:
• (i) hydrogen,
• (ii) linear and branched, saturated and unsaturated C1-C40 hydrocarbon-based radicals, optionally substituted with at least one group chosen from hydroxyl and —NR′R″, wherein R′ and R″ are chosen, independently of each other, from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals;
• the C1-C40 hydrocarbon-based radicals being optionally interrupted with at least one hetero atom chosen from N, O and Si,
• (iii) a radical chosen from
• 13
• in which:
• m is 1, 2, 3, 4 or 5;
• s is an integer between 0 and 4 inclusive;
• R2 is chosen from hydrogen, —NH2, —OH, —SH, —CHOHCH3, —CONH2,
• 14
• —C6H5 and —C6H5pOH,
• n is an average number of repeating units of greater than 1 such that the weight average molecular weight of the at least one material is between 200 and 200 000, inclusive.

A method for improving the moisturizing of and/or preventing from drying out a substance chosen from skin, mucous membranes and keratin fibres, comprising,

• applying to the substance, a product chosen from make-up products for caring for, treating, cleansing and protecting the skin of the face and the body, haircare compositions, antisun compositions, artificial tanning compositions and after-sun care compositions, the product comprising at least one material chosen from homopolymers and salts thereof of formula (I):
• 18
• in which:
• X is chosen from —O—, —S— and —NR, wherein R is chosen from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals,
• R1 is chosen from:
• (i) hydrogen,
• (ii) linear and branched, saturated and unsaturated C1-C40 hydrocarbon-based radicals, optionally substituted with at least one group chosen from hydroxyl and —NR′R″, wherein R′ and R″ are chosen, independently of each other, from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals;
• the C1-C40 hydrocarbon-based radicals being optionally interrupted with at least one hetero atom chosen from N, O and Si,
• (iii) a radical chosen from
• 19
• in which:
• m is 1, 2, 3, 4 or 5;
• s is an integer between 0 and 4 inclusive;
• R2 is chosen from hydrogen, —NH2, —OH, —SH, —CHOHCH3, —CONH2,
• 20
• —C6H5pOH,
• n is an average number of repeating units of greater than 1 such that the weight average molecular weight of the at least one material is between 200 and 200 000, inclusive.

A method for the cosmetic treatment of a substance chosen from skin, mucous membranes and keratin fibres, comprising:

• applying to the substance a moisturizer and/or emollient comprising at least one material chosen from homopolymers and salts thereof of formula (I):
• 21
• in which:
• X is chosen from —O—, —S— and —NR, wherein R is chosen from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals,
• R1 is chosen from:
• (i) hydrogen,
• (ii) linear and branched, saturated and unsaturated C1-C40 hydrocarbon-based radicals, optionally substituted with at least one group chosen from hydroxyl and —NR′R″, wherein R′ and R″ are chosen, independently of each other, from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals;
• the C1-C40 hydrocarbon-based radicals being optionally interrupted with at least one hetero atom chosen from N, O and Si,
• (iii) a radical chosen from
• 22
• in which:
• m is 1, 2, 3, 4 or 5;
• s is an integer between 0 and 4 inclusive;
• R2 is chosen from hydrogen, —NH2, —OH, —SH, —CHOHCH3, —CONH2,
• 23
• —C6H5and —C6H5POH,
• n is an average number of repeating units of greater than 1 and such that the weight average molecular weight of the at least one material is between 200 and 200 000, inclusive.

A cosmetic or pharmaceutical composition for improving the moisturization of the skin, mucous membranes and/or keratin fibres, the cosmetic or pharmaceutical composition comprising at least one material chosen from homopolymers and salts thereof of formula (I):

• 24
• in which:
• X is chosen from —O—, —S— and —NR, wherein R is chosen from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals,
• R1 is chosen from:
• (i) hydrogen,
• (ii) linear and branched, saturated and unsaturated C1-C40 hydrocarbon-based radicals, optionally substituted with at least one group chosen from hydroxyl and —NR′R″, wherein R′ and R″ are chosen, independently of each other, from hydrogen and linear and branched, saturated and unsaturated C1-C6 hydrocarbon-based radicals;
• the C1-C40 hydrocarbon-based radicals being optionally interrupted with at least one hetero atom chosen from N, O and Si,
• (iii) a radical chosen from
• 25
• in which:
• m is 1, 2, 3, 4 or 5;
• s is an integer between 0 and 4 inclusive;
• R2 is chosen from hydrogen, —NH2, —OH, —SH, —CHOHCH3, —CONH2,
• 26
• —C6H5 and —C6H5pOH,
• n is an average number of repeating units of greater than 1 such that the weight average molecular weight of the at least one material is between 200 and 200 000, inclusive.