| 摘要 |
PURPOSE:To obtain a microcapsule free from a macro-particle and having uniform particle size distribution, by a method wherein an oil-soluble metal compound, which forms an adsorbing layer insoluble in both of a hydrophilic liquid and a hydrophobic liquid to the interface of both liquids, is added to the hydrophobic liquid and encapsulated after emulsification. CONSTITUTION:An oil-soluble metal compound, especially, a metal compound having a mercapto group forming an adsorbing layer insoluble in a hydrophilic liquid and a hydrophobic liquid is added to the hydrophobic liquid and emulsified to be encapsulated. As the oil-soluble metal compound, a long chain polar compound containing a metal forming a certain kind of a complex at an interface is used. As a metal, an alkaline earth metal such as Mg and one forming one kind of an insoluble metal complex along with an emulsifier at the interface adsorbing layer of both of the hydrophilic liquid and the hydrophobic liquid such as Zn are proper. The use amount of the oil-soluble metal compound is 0.01-3%, pref., 0.02-2% on the basis of the hydrophobic liquid contained and, if 0.01% or less, uniform particle size distribution and the effect reducing the number of macro-particles are hard to obtain and, if 3% or more, the time required until an objective particle size is obtained becomes longer. |
