Poly high purity amphiphilic block copolymer and a method of manufacturing the same , including the hydrophobic polymer block of (- hydroxy acid )

摘要

Poly (.alpha.-hydroxy acid) of high purity amphiphilic block copolymer including a hydrophobic polymer block, and discloses a method of making the same. The method of producing high purity amphiphilic block copolymer including a hydrophobic polymer block of a poly (.alpha.-hydroxy acid), in the polymerization of amphiphilic block copolymers, .alpha.-hydroxy acid, its lactone monomers, involves the removal of the oligomer and organometallic catalysts.