SUSTAINED-RELEASE THERMOPLASTIC POLYMER COMPOSITION AND PRODUCT COMPRISING THE SAME

摘要

[PROBLEMS] To provide a sustained-release polymer composition in which a liquid compound having poor compatibility with the polymer can be contained in a stable state in a high concentration and be gradually released over long and which can hence perform a long-lasting function. [MEANS FOR SOLVING PROBLEMS] The polymer composition comprises a polymer and a liquid compound having poor compatibility with the polymer. When the liquid compound is caused to be held in the polymer in a high concentration, a block copolymer having in the molecule a copolymerized polymer block unit having high compatibility with both of the matrix polymer and the liquid compound is incorporated and dispersed. As a result, the block copolymer serves like a surfactant to form an interface and the liquid compound is enclosed inside the interface to thereby form a liquid-in-solid polymer type emulsion.