PROBLEM TO BE SOLVED: To provide the manufacturing method of a stable oil-in-water emulsion composition in which microparticles are uniformly dispersed.SOLUTION: In the manufacturing method of the oil-in-water emulsion composition, a mixture containing (A) a surfactant, (B) an oily component in a liquid state at 25°C and (C) water is formed into high pressure fluid, the high pressure fluid jetted from a jetting nozzle 11 is made to collide with a spherical hard body rotatably supported in a chamber for collision by a collision device 1 and emulsification is performed. In the collision device, a first jet nozzle 11 and a second jetting nozzle 12 are provided, to jet the fluid toward the hard body to make the jet stream collide against positions different from each other on the surface of the hard body. The jetting axis of the first jetting nozzle and that of the second jetting nozzle are directed to the positions eccentric with respect to the spherical center of the hard body, respectively.COPYRIGHT: (C)2010,JPO&INPIT【課題】微小粒子が均一に分散し、安定な水中油型乳化組成物を製造する方法の提供。【解決手段】(A)界面活性剤、(B)25℃で液状の油性成分及び(C)水を含有する混合物を高圧流体となし、衝突用チャンバ内に回転自在に支承された球状の硬質体に噴射ノズルから噴射される高圧噴流を衝突させる衝突装置により乳化させる水中油型乳化組成物の製造方法であって、前記硬質体に向けて流体を噴射して硬質体表面上の互いに異なる位置へ噴射流を衝突させる第1の噴射ノズルと第2の噴射ノズルとを備え、第1の噴射ノズルの噴射軸線と第2の噴射ノズルの噴射軸線とが、それぞれ前記硬質体の球心に対して偏心した位置に指向されている衝突装置を用いて乳化させる水中油型乳化組成物の製造方法。【選択図】図1
