Patent ID: 7037582

Claim:
A method for encapsulating a core component comprising paraffin compounds that can undergo phase transition, including the steps of: A dissolving the core component in a first solvent to form a first solution, said first solvent being non-reactive to the core component and includes first monomers to form a first polymer, and the core component being insoluble in the first polymer; B dispersing the first solution throughout a non-reactive medium that is immiscible with the first solution, to form a dispersion of droplets of the first solution; C forming an outer second polymer wall at the surface of said droplets of the first solution before the first polymer is formed by adding a second monomer to said dispersion with simultaneous mild stirring, such that the inner first polymer wall is formed inside the outer second polymer wall and cross-links with the outer second polymer wall, and the core component is encapsulated in a double layer microcapsule characterized in that the first monomer includes at least two organic compounds, one organic compound having two isocyanate groups and is soluble in said paraffin compound; and a further organic compound is a polypropylene glycol with an average molecular weight higher than 400.