Patent ID: 8071214

Claim:
A population of low permeability microcapsule particles comprising an oil soluble or dispersible core material and a wall material at least partially surrounding the core material, the microcapsule wall material consisting of: the reaction product of a first composition in the presence of a second composition consisting of an anionic emulsifier, the first composition consisting of a reaction product of i) an oil soluble or dispersible amine selected from the group consisting of aminoalkylacrylate and aminoalkyl methacrylate with ii) a multifunctional acrylate or methacrylate monomer or oligomer, an oil soluble acid and an initiator, wherein the ratio of amine to the multifunctional acrylate or methacrylate is from 0.1:99.9 to 10:90, the anionic emulsifier consisting of a water soluble or water dispersible acrylic acid alkyl acid copolymer, an alkali or alkali salt, and optionally a water phase initiator, wherein the first composition initiator and/or the water phase initiator is an energy-activated initiator, whereby the reaction product of the first composition and second composition results in the formation of a population of microcapsules having a microcapsule wall of low permeance to the core material.