Patent ID: 6211249
Filing Date: 2001-04-03
Classification: A61L,A61P,C08G

Abstract:
A polymeric composition comprising diisocyanate coupled AB diblocks, where A is a polyester unit obtained by polymerizing monomers selected from the group consisting of lactic acid, lactide, glycolic acid, glycolide, .beta.-propiolactone, .epsilon.-caprolactone, .delta.-glutarolactone, .delta.-valerolactone, .beta.-butyrolactone, pivalolactone, .alpha.,.alpha.-diethylpropiolactone, ethylene carbonate, trimethylene carbonate, .gamma.-butyrolactone, cyclic esters of .alpha.-hydroxybutyric acid, .alpha.-hydroxyvaleric acid, .alpha.-hydroxyisovaleric acid, .alpha.-hydroxycaproic acid, .alpha.-hydroxy-.alpha.-ethylbutyric acid, .alpha.-hydroxyisocaproic acid, .alpha.-hydroxy-.alpha.-methyl valeric acid, .alpha.-hydroxyheptanoic acid, .alpha.-hydroxysteanric acid, .alpha.-hydroxylignoceric acid, and mixtures, thereof and B is obtained by reacting a polyalkylene oxide end-capped with a non-reactive group selected from the group consisting of alkyl aryl, aralkyl, substituted alkyl, substituted aryl and substituted aralkyl, said polyalkylene oxide initiating the polymerization of said monomers to form said polyester unit, said AB diblock being further diisocyanate coupled to produce di-diblock polymers.