Polymer containing monomer units of chemically modified polyaspartic acids or their salts and process for preparing the same

摘要

A polymer containing the following monomer unit (I) and/or (II): <IMAGE> (I) <IMAGE> (II) and a process for preparing the polymer which comprises, in ring opening reaction of the polysuccinimide, opening the ring of polysuccinimide by using an amino acid ester having an extremely high reactivity in place of an alpha -amino acid having an extremely low reactivity. The polymer is characterized by having no irritation to organisms (e.g., eyes and skin), and for example, the polymer is useful in the industrial fields of fields of medical supplies, health, beauty and sanitary aids, quasi-pharmaceuticals, and the like.