Patent ID: 7919572

Claim:
Polyamino acid comprising aspartic residues and/or glutamic residues, wherein said polyamino acid has general formula (I) below: in which: R1 is selected from the group consisting of: H, a linear C2 to C10 acyl group, a branched C3 to C10 acyl group, and pyroglutamate; R2 is selected from the group consisting of: H, a linear C2 to C10 alkyl group, a branched C3 to C10 alkyl, benzyl and a C- terminal “amino acid” unit; R3 is H, or R3 + is a cationic entity selected from the group consisting of: metal cations, sodium cation, potassium cation, calcium cation, magnesium cation, cations based on amine, cations based on oligoamine, cations based on polyamine, polyethylenimine, cations based on amino acid(s), cations based on lysine, cations based on arginine, polylysine and oligolysine; the n B groups are independently: in which: each R4 is selected from the group consisting of: methyl, isopropyl, isobutyl, sec-butyl and benzyl; each R5 is a hydrophobic group, excluding alpha-tocopheryloxy, wherein the hydrophobic group is an alcohol precursor selected from the group consisting of octanol, dodecanol, tetradecanol, hexadecanol, octa-decanol, oleyl alcohol and cholesterol; and 1 equals 1; A is —CH 2 — or —CH 2 CH 2 —; the molar grafting rate n/(n+m) is 0.5 to 100 mol %; and n+m varies from 3 to 1000.