Cosmetic composition comprising a polyhydroxyalkanoate in an oily medium

A composition comprising:

• a) a polyhydroxyalkanoate copolymer comprising the following polymeric units A, B and C:
• —[—O—CH(R1)-CH2-CO—]— unit A
• —[—O—CH(R2)-CH2-CO—]— unit B
• —[—O—CH(R3)-CH2-CO—]— unit C
• in which:
• R1 denotes a linear alkyl radical having from 5 to 9 carbon atoms;
• R2 denotes a linear alkyl radical having a carbon number corresponding to the number of carbon atoms of the R1 radical −2;
• R3 denotes a linear alkyl radical having a carbon number corresponding to the number of carbon atoms of the R1 radical −4;
• the molar percentage of unit A being greater than the molar percentage of unit B and greater than the molar percentage of unit C;
• b) an oily medium comprising a non-silicone oil chosen from:
• ester oils, carbonate oils,
• branched nonpolar hydrocarbon oils having from 8 to 14 carbon atoms, as a mixture with a monoalcohol having from 2 to 6 carbon atoms according to a monoalcohol/branched nonpolar hydrocarbon oil ratio by weight ranging from 1/99 to 10/90;
• and
• when the polymer is such that the R1 alkyl group has from 6 to 9 carbon atoms, the non-silicone oil is also chosen from nonpolar hydrocarbon oils having from 8 to 14 carbon atoms in the absence of monoalcohol having from 2 to 6 carbon atoms;
• when the polymer is such that the R1 alkyl group comprises 9 carbon atoms, the non-silicone oil is also chosen from hydrogenated polyisobutylenes.