Patent ID: 6287604
Filing Date: 2001-09-11
Classification: A61K,C08G,Y10S,Y10T

Abstract:
A particulate carrier for delivery of biologically active materials to a host, said carrier comprising a polymer having a molecular weight of about 5,000 to about 40,000 daltons and having the general formula: ##STR3##wherein:R.sub.1, R.sub.2 and R.sub.5 are selected independently and are selected from H, linear or branched alkyl groups;R.sub.3 and R.sub.4 are H;R.sub.8 is selected from H, an amine protecting group, a spacer molecule or a biologically active species;X is selected from an O or S group; andx and y are integers such that at least 95% of the polymer is comprised of .alpha.-hydroxy acid residues.