Degradable polymer network.

摘要

A degradable polymer network is obtained by adding from 0.2 to 10 parts by weight of a foaming agent to 100 parts by weight of a polylactic acid-base resin composition comprising from 80 to 100 % by weight of polyactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20 % by weight of a plasticizer, conducting melt-foaming extrusion of resulting mixture, and opening the foam cells in the extrudate by stretching. The high polymer network is characterized in suitable flexibility and hydrolyzability and thus useful as a material for absorbers of oils and body fluids, screens for sunlight, heat-isulating materials, filter media and packaging materials; and does not accumulate as industrial wast because of hydrolyzability in the natural environment, even though discarded after use.