Polyanhydrides and methods of making same

A process for producing a narrow-polydisperse polyanhydride, the process comprising melt polycondensation of a dicarboxylic acid and a hydroxy-alkanoic acid in the presence of an amount of acetic anhydride not exceeding a mole equivalent thereof per each free carboxylic acid group and in absence of a solvent, wherein the process excludes formation of poly(dicarboxylic acid).

A polyanhydride prepared by melt condensation of a dicarboxylic acid and a hydroxyl-alkanoic acid with a mole equivalent or less of acetic anhydride per carboxylic acid group, the polyanhydride being a narrow-polydispersed polymer.

A polyanhydride of the form —(SA-RA)n-, wherein SA is sebacic acid and RA is ricinoleic acid, and wherein n is an integer between 10 and 100, prepared by melt condensation of SA and RA with a mole equivalent or less of acetic anhydride per carboxylic acid group, the polyanhydride being a narrow-polydispersed polymer.

A process for producing a narrow-polydisperse polyanhydride of the form -(SA-RA)n-, wherein SA is sebacic acid and RA is ricinoleic acid, and wherein n is an integer between 10 and 100, the process comprising melt polycondensation of RA and SA in presence of an amount of acetic anhydride not exceeding a mole equivalent thereof per each free carboxylic acid group and in absence of a solvent, wherein the process excludes formation of poly(sebacic acid).