Patent ID: 8021652

Claim:
A micellar composition comprising a branched polylactic acid derivative of formula (I) for forming micelles in an aqueous solution with a pH of 4 or more: I—(R—X) n (1) Wherein, R is —[R 1 ] k —[R 2 ] m —, wherein R 1 is —C(═O)—CHZ—O—, R 2 is selected from the group consisting of —C(═O)—CHY—O—, —C(═O)—CH 2 CH 2 CH 2 CH 2 CH 2 —O— and —C(═O)—CH 2 —O—CH 2 CH 2 —O—, wherein each of Z and Y is selected from the group consisting of hydrogen, methyl, and phenyl, k is an integer of 1-30, m is an integer of 0-30; X is —C(═O)—(CH 2 ) a —C(═O)—O-M, wherein a is an integer of 0-10, M is selected from the group consisting of hydrogen, sodium, potassium, and lithium; I is a diol or a polyol having 3-12 hydroxy groups; n is the same as the number of hydroxy groups that I has, and wherein I is selected from the group consisting of ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, glycerol, erythritol, threitol, pentaerythritol, xylitol, adonitol, sorbitol, mannitol, disaccharide and trisaccharide, and wherein the branched polylactic acid derivative has a number average molecular weight of 1,000-18,000 Dalton.