| 摘要 |
PURPOSE:To obtain a capsule extremely narrow in particle size distribution, by a method wherein a hydrophobic liquid containing polyvalent isocyanate is emulsified and dispersed in a hydrophilic solution of an unsaturated monocarboxylic acid type copolymer and a coating film is formed to each formed liquid particle to coat the same. CONSTITUTION:Unsaturated monocarboxylic acid type monomers such as acrylic acid, metharylic acid or the like are subjected to copolymerization in a combined form to prepare 20-98mol% copolymer which is in turn contained in a hydrophilic medium used in producing a capsule to prepare a hydrophilic solution. On the other hand, polyvalent isocyanate such as m-phenylene dissocyanate is added to a hydrophobic liquid such as cotton seed oil or hydrogenated terphenyl in a ratio of 0.02-60:1. In the next step, the aforementioned hydrophobic liquid is emulsified and dispersed in the unsaturated monocarboxylic copolymer-containing hydrophilic solution and polyvalent isocyanate is polymerized at the interface of a liquid droplet to form a synthetic high molecular film which is in turn applied to the surface of the hydrophobic liquid. |
