<；P>；PROBLEM TO BE SOLVED: To obtain a sustained-release agent for a functional water-soluble material which can prevent a functional water-soluble material from being discharged early by having sufficient strength to resist to water flows and agitation and by securing a sufficient carrying amount of the functional water-soluble material. <；P>；SOLUTION: The sustained-release agent for the water-soluble material comprising a water-insoluble resin, a structural material, and the functional water-soluble material, consisting of a resin composition in which these materials are mutually distributed are manufactured wherein the content ratio of the functional water-soluble material in the resin composition is 20-90 wt.%, and at least either one of the structural material or the water-insoluble resin is hydrophilic. <；P>；COPYRIGHT: (C)2006,JPO&NCIPI
