Silicone acrylate and trifluoroethyl methacrylate polymer, preparation and use thereof in cosmetics

A linear, branched or crosslinked anionic polyelectrolyte resulting from the polymerization, for 100% by weight:

• a) of a proportion by weight of greater than or equal to 70% and less than or equal to 98.5% of monomer units resulting from a monomer comprising a strong acid functional group which is free or partially or completely salified;
• b) of a proportion by weight of greater than or equal to 0.5% and less than or equal to 10%,
• either of a monomer of formula (Ia):
• R—(CH2)3—Si(CH3)2—[O—Si(CH3)2—]nO—Si(CH3)2—(CH2)3—R (Ia),
• in which:
• R represents the monovalent radical:
• —(O—CH2—CH2—)x[O—CH2—CH(CH3)—]yO—C(═O)—CH═CH2,
• in which x and y represent, independently of one another, an integer of greater than or equal to 0 and less than or equal to 40, it being understood that the sum x+y is greater than 0 and less than 50;
• and
• n represents an integer of greater than or equal to 0 and less than or equal to 45,
• said monomer of formula (Ia) having a molecular weight of greater than or equal to 1500 and less than or equal to 7000;
• or of a monomer of formula (Ib):
• Si(CH3)3—[O—Si(CH3)2—]m[O—Si(CH3)[(CH2)3—R]—]pO—Si(CH2)3 (Ib),
• in which:
• R represents a monovalent radical of formula:
• —(O—CH2—CH2—)x[O—CH2—CH(CH3)—]yO—C(═O)—CH═CH2,
• in which x and y represent, independently of one another, an integer of greater than or equal to 0 and less than or equal to 40, it being understood that the sum x+y is greater than 0 and less than 50;
• m represents an integer of greater than or equal to 1 and less than or equal to 7, and
• p represents, independently of m, an integer of greater than or equal to 1 and less than 20;
• said monomer of formula (Ib) having a molecular weight of greater than or equal to 1000 and less than or equal to 4000;
• c) of a proportion by weight of greater than or equal to 1% and less than or equal to 20% of a monomer of formula (II):
• CH2═C(R1)—C(═O)—O—(CH2)n—CF3
• in which formula (I) the R1 radical represents a hydrogen atom or a methyl radical and n represents an integer equal to 1, 2 or 3;
• d) optionally of a proportion by weight of greater than 0% and less than or equal to 5% of monomer units resulting from a monomer of formula (III):
• R2—C(═O)—O—[(CH2—CH(R4)—O]m—R3 (III),
• in which formula (II) m represents a number greater than or equal to 0 and less than or equal to 50, R2 represents an unsaturated monovalent aliphatic radical comprising from 2 to 4 carbon atoms, R4 represents a hydrogen atom, a methyl radical or an ethyl radical and R3 represents a saturated or unsaturated, linear or branched, aliphatic hydrocarbon radical comprising from 8 to 30 carbon atoms, and
• e) optionally of a proportion by weight of greater than 0% and less than or equal to 5% of at least one diethylenic or polyethylenic crosslinking monomer.