Patent ID: 9227221
Filing Date: 2016-01-05
CPC Classification: B01J,B05D,C04B,C08K,C09B,C09D

Claim Text:
1. A method of forming hydrophilic-core microcapsules comprising: forming a single hydrophilic phase including at least one pre-polymer or monomer, a cross-linking agent, at least one active substance, an optional co-solvent, and water; forming a single hydrophobic phase including a hydrophobic substance and optionally at least one surfactant in the absence of any pre-polymer or monomer and in the absence of any cross-linking agent; mixing the hydrophobic phase with the hydrophilic phase to create and disperse droplets of the hydrophilic phase within the hydrophobic phase to form an emulsion; and initiating a reaction at an interface of the hydrophilic phase and the hydrophobic phase to form a solid shell encapsulating the hydrophilic phase forming hydrophilic-core microcapsules, wherein said solid shell includes a shell wall comprising a compound having one or more chemical bonds that are broken down when contacted with an alkali produced during a corrosion reaction causing the release of the hydrophilic phase, wherein said alkali has a pH above about 8.