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Microcapsule having temperature-dependent permeability profile

  • US 5,120,349 A
  • Filed: 12/07/1990
  • Issued: 06/09/1992
  • Est. Priority Date: 12/07/1990
  • Status: Expired due to Fees
First Claim
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1. A microcapsule comprised of a crystallizable polymer, the crystallizable polymer being comprised such that it has a first permeability at a temperature below a first order phase transition temperature of the polymer and a second permeability at a temperature at or above the first order phase transition temperature, wherein the second permeability is at least three times that of the first permeability and wherein the permeability of the microcapsule can be repeatedly and reversibly changed between the first and second permeability by changing the temperature of the microcapsule above and below the first order transition temperature.

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