of the carboxylic ester is between 10 and 18 the organic solvent is not necessary because the polar phase change material can solve the lipophilic monomer and the hydrophilic monomer or pre polymer has the function of the surfactant the surfactant is excluded from the composition of the present invention the microcapsules produced by the composition and method provided in the present invention has hydrophilic shell therefore the microcapsule is dispersed in the water phase and the heating process which damages the microcapsules for removing the solvent is avoided two examples disclosed below is that the organic solvent is added to the composition of the present invention the examples illuminate that the microcapsules can be fabricated while the composition includes organic solvent and the hydrophilic monomer or pre polymer still can be used as a surfactant the outstanding potency of the waterborne polyurethane is more obvious a composition with waterborne polyurethane 48 grams water 300 grams isocyanurate of 1 6 hexamethylene diisocyanate 7 grams ethyl acetate 120 grams octadecanyl formate 217 grams and solid wax 17 grams is put in a reactor in which a water phase comprises waterborne polyurethane and water the oil phase comprises isocyanurate ethyl acetate octadecanyl formate and solid wax a homogenizer stirs the composition at 7000 rpm for 3 minutes after the stirring process the temperature.