Patent ID: 9714397
Date: 2017-07-25
CPC Classifications: A61K,A61Q,B01F,B01J,C11B,C11D

Claim:
1. A method of making microcapsules whose shell wall comprises on one surface a first (meth)acrylate polymer and on its other surface a second (meth)acrylate polymer, said first (meth)acrylate polymer derived from an aqueous phase (meth)acrylate polymer wall forming composition and said second (meth)acrylic polymer derived from an oil phase (meth)acrylate polymer wall forming composition comprising a combination of (a) at least one oil soluble or dispersible amine (meth)acrylate, (b) at least one oil soluble or dispersible acidic (meth)acrylate or at least one oil soluble or dispersible simple acid or both, and (c) at least one oil soluble or dispersible multifunctional (meth)acrylate monomer or oligomer, and an intermediate region comprising an interpenetrating network and/or copolymer of the two wall forming compositions, said method comprising: (i) forming an oil-in-water or a water-in-oil emulsion of the two (meth)acrylate polymer wall forming compositions, (ii) subjecting the emulsion to conditions for concurrently, at last in part, polymerizing the wall forming materials of each of the oil phase and water phase, and (iii) allowing the reaction to continue until the microcapsules of desired wall thickness are attained.