Patent ID: 9714396
Date: 2017-07-25
CPC Classifications: A61K,A61L,A61Q,B01J,C11B,C11D

Claim:
1. A method of making dual melamine resin/(meth)acrylate polymer walled microcapsules from a first water phase composition comprising a melamine resin forming composition and a second water phase composition comprising a (meth)acrylate polymer forming composition wherein the method comprises: (i) forming an oil-in-water emulsion wherein the oil phase comprises the core material to be encapsulated and one of the first or second aqueous phase compositions, (ii) subjecting the oil-in-water emulsion to conditions for effecting polymerization of the wall forming material contained in the selected aqueous phase composition, (iii) maintaining the reaction mix under such conditions as will effect the encapsulation of the oil phase in a polymer shell formed of the wall forming composition of the selected aqueous phase composition until the shell wall thickness of the microcapsules is such that monomer of either aqueous phase composition is unable to penetrate the shell wall; (iv) adding the other aqueous phase composition to the reaction mix or isolating the microcapsules so formed and adding them to the other aqueous phase, and subjecting the so formed mixture to such conditions as will effect polymerization of the wall forming material of the subsequently added/other aqueous phase composition, and (v) maintaining the reaction mix under such conditions as will effect deposition and polymerization of the wall forming material of the subsequently added aqueous phase composition until the desired wall thickness is attained.