A series of aqueous polyurethane dispersion were prepared by the reaction of hydroxyl‐terminated poly(ethylene adipate), dimethylol propionic acid, 4,4′‐diphenylmethane diisocyanate, and ethylene glycol. Formation of the dispersion was achieved by phase inversion of an acetone solution of the polyurethane with water, utilizing carboxylate anion groups as the internal emulsifying sites. The amount of acetone added has a large effect on the particle diameter (0.08 μm to 8.61 μm) and particle size distribution of the polyurethane emulsion. The storage stability was evaluated in terms of particle size and particle size distribution. The aqueous emulsion obtained with no use of acetone was sufficiently stable in storage at least over six months.
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Chinwanitcharoen et al. (2004) studied this question.
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