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Hydrophobic-core microcapsules and their formation

  • US 9,233,394 B2
  • Filed: 08/13/2010
  • Issued: 01/12/2016
  • Est. Priority Date: 09/19/2005
  • Status: Active Grant
First Claim
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1. A method of forming hydrophobic-core microcapsules comprising:

  • forming a hydrophobic phase including a pre-polymer or monomer, a cross-linking agent, at least one active substance, wherein said at least one active substance is a corrosion indicator, a corrosion inhibitor, or combination thereof, an optional co-solvent, and a hydrophobic substance;

    forming a hydrophilic phase;

    mixing the hydrophobic phase with the hydrophilic phase to create and disperse droplets of the hydrophobic phase within the hydrophilic phase to form an emulsion;

    initiating a reaction at an interface of the hydrophilic phase and the hydrophobic phase to form a solid shell encapsulating the hydrophobic phase forming hydrophobic-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 hydrophobic phase, wherein said alkali has a pH above about 8.

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