PROBLEM TO BE SOLVED: To provide a sustained-release biodegradable coating agent comprising a polylactic acid-based resin having self-emulsification function of forming stable aqueous dispersion without adding an emulsifier, and a body with the sustained-release biodegradable coat, because: it is convenient that when a polylactic acid-based biodegradable resin to be used as a coating agent is able to form an aqueous dispersion, the biodegradable coated body can be readily obtained by a method comprising dissolving or dispersing the component to be coated into the aqueous dispersion, and then spraying the aqueous dispersion itself to vaporize moisture into a particle form, or the like and it is preferable that when the polylactic acid-based biodegradable resin is self-emulsifiable one that can form aqueous dispersion without adding a surfactant, there occurs no release of surfactants in the environment during the biodegrading process so as to reduce environmental load.SOLUTION: This sustained-release biodegradable coating agent comprises a copolymer polyurethane resin having a polylactic acid segment and a sulfonate group-containing segment in the molecule. The body with the sustained-release biodegradable coat is obtained by coating a component to be coated with the coating agent.COPYRIGHT: (C)2013,JPO&INPIT【課題】 被覆剤として用いるポリ乳酸系生分解性樹脂が水分散体を形成することができるものであると、被被覆成分を水分散体に溶解または分散させ、ついで水分散体自体を噴霧し水分を蒸散させて粒子状とする等の方法によって、容易に生分解性被覆体を得ることができ、好都合である。しかも、ポリ乳酸系生分解性樹脂が界面活性剤の添加なしに水分散体を形成することができる自己乳化性のものであると、生分解の過程で界面活性剤を環境中に放出することがなく、より環境負荷が少なくなり、好ましい。【解決手段】 ポリ乳酸セグメントとスルホン酸塩基含有セグメントを分子中に有する共重合ポリウレタン樹脂からなる徐放性生分解性被覆剤、該被覆剤によって、被被覆成分を被覆した徐放性生分解性被覆体。【選択図】 なし
