Patent ID: 7226616
Filing Date: 2007-06-05
Classification: A61K,A61P,C08G

Abstract:
1. A block copolymer having the formula: wherein X is —C(═O)—(CH 2 ) 2 —(C═O)—O—CH 2 CH 2 —Y or —C(═O)CHR 1 Y; wherein R 1 is H, a methyl, benzyl, 2-methylpropyl or 1-methylpropyl group; Y is —NH 3 + , —NRH 2 + , —NR 2 H + , or —NR 3 + wherein R is a methyl, ethyl or 2-hydroxyethyl group; and z denotes an integer from 0 to 6; M represents an anion; A is a biocompatible hydrophilic polymer; B is a biodegradable hydrophobic polymer; and L represents a linker selected from the group consisting of —O—, —NH—, —S— and —COO—.