초록

A process for encapsulating a partially water-miscible organic material within a polyurea or polyurethane shell is provided utilizing a water-soluble tertiary amine in the reaction dispersion. Microcapsules and methods of using microcapsules are also provided.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for encapsulating a partially water-miscible organic material within a polyurea or polyurethane shell, which process comprises:(a) providing an aqueous phase containing a surfactant;(b) dispersing in said aqueous phase a water-immiscible organic solvent in whi

[ What is claimed is:] [1.]1. A process for encapsulating a partially water-miscible organic material within a polyurea or polyurethane shell, which process comprises:(a) providing an aqueous phase containing a surfactant;(b) dispersing in said aqueous phase a water-immiscible organic solvent in which the partially water-miscible material to be encapsulated and a polyisocyanate are dissolved or dispersed, to form a dispersion of droplets of organic solvent in the continuous aqueous phase;(c) adding to the dispersion a water-soluble tertiary amine;(d) thereafter adding to the dispersion a polyfunctional compound containing functional groups selected from the group consisting of primary amine, secondary amine and hydroxy groups, whereby there is formed discrete capsules composed of the material encapsulated in a polyurea or polyurethane shell.