Method of continuous production of microcapsules
AssigneeFuji Photo Film Co., Ltd.
InventorsHideo Nagano, Yoshihito Hodosawa, Hirokazu Saitoh
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Abstract
An oily liquid and an aqueous liquid as prepared at a temperature of 80.degree. C. are continuously emulsified at a temperature of 50.degree. C. or higher to give an emulsion, then a liquid comprising a polyamine and a concentration adjusting water of 50.degree. C. or higher is added to the emulsion and mixed in a static mixer, the emulsion mix is continuously flown into an encapsulation device from the bottom to the top thereof, and microcapsules are obtained by overflowing after a retention time of 60 minutes on average.
Claims1
A method of continuous production of microcapsules comprising mixing a polyisocyanate with an oily liquid containing a capsule core substance, emulsifying and dispersing the mixture liquid in an aqueous liquid containing an emulsifier to form an emulsion and reaction the emulsion with a polyamine to form microcapsules each having a polyurethane-urea resin wall at the liquid-drop interface;
- the method further comprising continuously emulsifying the mixture liquid of said oily liquid and the aqueous liquid at a temperature higher than 50.degree. C., then adding a polyamine and hot water both of a temperature higher than 50.degree. C. to said emulsion and thereafter subjecting the emulsion to a wall forming treatment;
- wherein said adding of said polyamine and hot water is effected by continuously adding and mixing thereof to a pipe line containing said emulsified liquid and thereafter effecting the wall forming treatment;
- and wherein the method additionally comprises overflowing the emulsion to which said polyamine and water have been continuously added by continuously feeding said emulsion from the bottom of an encapsulating device to the top thereof to continuously effect the wall forming treatment.
Dependencies are inferred from the claim text.