Use of polymers for drug delivery

Patent Granted The present invention relates to compounds and compositions of formula I, which are unsymmetrical aromatic ether diacids, and polymers formed from the same. [R'--(Y).sub.p--O].sub.q--Ar--[O--(X).sub.r--R'].sub.s I The compounds are expected to be useful in a variety of medical and/or cosmetics applications. Polymers formed from the functionalized unsymmetrical aromatic ether diacids are expected to have controllable degradation profiles, enabling them to release an active component over a desired time range.