申请人:CIBA-GEIGY AG
公开号:EP0551796A2
公开(公告)日:1993-07-21
This invention relates to a process for encapsulation and particularly for the preparation of microcapsules having a capsule wall of a solid polymeric substance enclosing a water-immiscible material, which process comprises preparing a solution of a first reactive component required to form the capsule wall in the water-immiscible material, then dispersing the mixture in an aqueous medium containing a surfactant which is a salt of a partial ester of a styrene-maleic anhydride copolymer, to form an oil-in-water emulsion, and subsequently adding a second reactive component required to form the capsule wall which is complementary to the first one and reacts with it under the mixing conditions, whereby a solid polymeric wall is formed about the dispersed water-immiscible material. The resulting stable aqueous suspension of microcapsules can either be used directly or after dilution with water, or the microcapsules can be separated from the aqueous phase.
本发明涉及一种封装工艺,特别是用于制备微胶囊的工艺,该微胶囊的囊壁由包覆水不混溶性材料的固体聚合物物质构成,该工艺包括制备在水不混溶性材料中形成囊壁所需的第一种活性成分的溶液、然后将混合物分散在含有表面活性剂的水介质中,表面活性剂是苯乙烯-马来酸酐共聚物部分酯的盐,以形成水包油型乳液,随后加入形成胶囊壁所需的第二种活性成分,第二种活性成分与第一种活性成分互补,并在混合条件下与第一种活性成分发生反应,从而在分散的不溶水材料周围形成固体聚合物壁。得到的稳定的微胶囊水悬浮液可以直接使用或用水稀释后使用,也可以将微胶囊从水相中分离出来。