Patent ID: 7012138

Claim:
An ester of a polysaccharide which is chiral in the acyl moiety of the ester and which is obtained by reacting, in a basic solvent, at least one polysaccharide and at least one acid or acid derivative of formula (I): in which X corresponds to a hydroxyl or to a halogen, Ra represents an aryl, aralkyl, aralkenyl, alkylaryl or alkenylaryl radical, a 6-methoxy-2-naphthalenyl, chlorophenyl, dimethylphenyl or thiophenyl group and R 1 represents a linear C 1 –C 20 -alkyl-radical, a branched C 1 –C 20 alkyl-radical or a cyclic C 3 –C 20 -alkyl-radical, with the proviso that when R 1 is —CH 3 then Ra is not a phenyl, the acyl units attached to said polysaccharide being not all of identical chirality.