nched, saturated and unsaturated C1-C14 hydrocarbon groups; wherein at least one of R9 and Rio is not hydrogen; [ 0008 9 ] R7 is a non hydro lyzable functional group providing a cosmetic effect, and [ 000 90 ] R8 is a non hydrolyzable functional group bearing at least one function chosen from: amines, carboxylic acids and salts thereof, sulfonic acids and salts thereof, polyols such as glycol, pol