| 摘要 |
PURPOSE:To obtain a stable dispersion without receiving the influence of a water soluble high-molecular compound by performing efficient encapsulation, in a method for coating the water soluble high-molecular compound after adsorption with a radical polymer, by performing adsorbing treatment in two stages while a temp. is changed. CONSTITUTION:An inorg. particles is suspended in water and the almost lower limit critical temp. of a water soluble high-molecular compound having a lower limit critical consolute temp. for adsorbing said particle is held. On the other hand, an aqueous solution of the aforementioned high-molecular compound is prepared and the concn. thereof is set so that a concn. after said compound is added to the inorg. particles suspension is a saturation adsorption equlibrium concn. or more. This aqueous solution is held to the same temp. as the aforementioned inorg. particle suspension while the inorg. particle suspension is added to the aqueous solution to perform first stage adsorbing treatment under stirring. Subsequently, by raising the temp. of the resulting system under stirring, an adsorbing layer of the water soluble high-molecular compound is formed to the inorg. particle. A radical polymerizable monomer, an initiator, if necessary, an emulsifier are added to the obtained particle suspension and emulsion polymerization is performed to obtain an encapsulated particle. |
