Patent ID: 7736695

Claim:
A process for preparing process encapsulating an oil phase, the process comprising: dispersing an oil soluble amine modified polyfunctional polyvinyl monomer or oligomer and an oil soluble bi- or polyfunctional vinyl monomer or oligomer along with a free radical initiator and an organic acid and a core material into an internal phase oil; the organic acid selected from the group consisting of monoalkyl maleate, alkyl benzene sulfonic acid, and alkyldiphenyloxide sulfonic acid; a first heating step comprising, heating for a time and temperature sufficient to oligomerize or further oligomerize the amine modified polyfunctional polyvinyl monomer or oligomer and oil soluble bi- or polyfunctional vinyl monomer or oligomer forming a pre-polymer; adding to the internal phase oil a water phase in excess comprising a dispersion in water of a polyacrylic or polymethacrylic acid, a free radical initiator, and an emulsifying agent; emulsifying the oil phase into the water phase forming droplets of the oil phase dispersed in the water phase; a second heating step comprising, heating for a time and temperature sufficient to decompose the free radical initiator in the oil and water phases; thereby forming microcapsule wall material at the interface of the water and oil phases, the process encapsulating the oil phase droplets; and, a third heating step comprising heating to a temperature equal to or greater than the second heating step temperature for a time sufficient to polymerize the wall material.