申请人:MONSANTO COMPANY
公开号:EP0165227A2
公开(公告)日:1985-12-18
This invention relates to a process for encapsulation, and particularly to the production of small or minute capsules constituted by a skin or thin wall of polymeric material e.g., polyurea, polyamide, polysulfonamide, polyester, polycarbonate, or polyurethane, which involves first providing an aqueous solution (continuous phase liquid) containing an emulsifier which is a water soluble, alkylated polyvinyl pyrrolidone polymer which will form a stable oil-in-water emulsion under the process conditions described herein. A discontinuous (immiscible or organic) phase liquid containing a water-immiscible material which is the material to be encapsulated, plus a first shell wall component; is dispersed in the aqueous liquid to form an oil-in-water emulsion. The second shell wall component is added to the oil-in-water emulsion whereupon the first shell wall component reacts with the second shell wall component to form a solid polycondensate shell wall about the material to be encapsulated. The capsules formed may be directly used as in the form of an aqueous suspension.
本发明涉及一种封装工艺,特别是由聚合材料(如聚脲、聚酰胺、聚磺酰胺、聚酯、聚碳酸酯或聚氨酯)的表皮或薄壁构成的小型或微小胶囊的生产工艺,其中包括首先提供一种水溶液(连续相液体),该水溶液含有一种乳化剂,该乳化剂是一种水溶性的烷基化聚乙烯吡咯烷酮聚合物,在本文所述的工艺条件下将形成稳定的水包油乳液。一种不连续(不溶或有机)相液体含有一种不溶于水的材料,这种材料就是要封装的材料,再加上第一种壳壁成分;分散在水性液体中,形成水包油型乳液。将第二种壳壁组分加入水包油型乳液中,此时第一种壳壁组分与第二种壳壁组分发生反应,形成关于待封装材料的固体聚凝壳壁。形成的胶囊可直接以水悬浮液的形式使用。