New polyester polyurethanes, process for preparaing them, pseudolatices produced from the said polyester polyurethanes and their use in cosmetic compositions

A water-based cosmetic composition having film-forming properties, comprising as film-forming resin, a neutralized non crosslinked polyester polyurethane in the form of particles in an aqueous dispersion, said aqueous dispersion being present in a proportion ranging from 0.5 to 30% by weight relative to the total weight of the composition, the average diameter of the particles being between 5 and 300 nm, and said non crosslinked polyester polyurethane containing units corresponding to the following formulae (I) and (II):

• 12
• in which:
• R represents an alkylene or cycloalkylene radical or a bivalent aromatic radical having from 6 to 15 carbon atoms,
• n represents an integer such that the molecular weight of the recurring unit is between 400 and 5,000,
• R1 represents a bivalent radical selected from the group consisting of:
• (i) [Parenopenst]CH2[Parenclosest]m, m being an integer between 2 and 12, and
• (ii)
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• the movable bond being in the ortho, meta or para position,
• R2 represents a bivalent radical selected from the group consisting of:
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• R3 representing a hydrogen atom or a branched alkyl radical having from 1 to 3 carbon atoms,
• R4 representing a hydrogen atom or a linear or branched alkyl radical having from 1 to 4 carbon atoms,
• R5 representing a linear or branched alkyl radical having from 1 to 4 carbon atoms, and
• p being 0 or 1;
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• in which:
• R is as defined above for the unite of formula (I),
• A represents an alkylene radical having from 2 to 20 carbon atoms, substituted with a carboxylic or sulphonic acid function, or interrupted by a tertiary nitrogen atom,
• and wherein said carboxylic acid or sulphonic acid function is neutralized with a neutralizing agent selected from the group consisting of an inorganic base and an organic base, and said tertiary nitrogen atom is neutralized with a neutralizing agent selected from the group consisting of an inorganic acid and an organic acid, the degree of neutralization being between 20 and 100%,
• the mole ratio between the units (II) and units (I) being between 1:1 and 10:1.