Patent ID: 8378060

Claim:
A composition of the formulae: MZAORS n R 1 F 1 m OAZ 1 M 1 , wherein O and S have their normal meaning of oxygen and sulfur; n is at least 2 and not more than 8; F 1 is of the formula —OAORS n R 1 — m is at least 1; Z and Z 1 are amino; or Z is amino and Z 1 is oxy; or Z is oxy and Z 1 is amino; M and M 1 are the same or different and are hydrogen or an organic substituent; R and R 1 are the same or different and are organic divalent radicals, each having from 2 to 20 carbon atoms; and A is the residue of a dicarboxylic acid of from 2 to 40 carbon atoms.