NOVEL POLYMERS WITH HYDROXYL ACID BLOCKS

摘要

The present invention relates to the preparation of modified polymers by incorporating a compositional modifier into a polymer to produce the modified polymer. More particularly, the invention relates the preparation of condensation type copolyesters or copolyamides by joint short length polyester or polyester oligomers or short length polyamide or polyamide oligomers with a modifier which contains hydroxyl acids blocks.

主权项

1. A polymer comprising non-degradable blocks and degradable blocks, wherein said polymer has the structure of Formula (Ia): wherein p, q and r are positive integers, t≧2 m is 1, and n is zero; and R, R1, R2, R3, R4 and R″ are independently selected in each structural unit from the group consisting of H, substituted alkyl, and unsubstituted alkyl.