Polyurethane Dispersions Derived from Polycarbonatediols and a Carboxylic Polycaprolactonediol

Aqueous polyurethane dispersions derived from various polycarbonatediols, a carboxylic polycaprolactonediol, PLACCEL205BA, and isophorone diisocyanate (IPDI) were prepared. The effect of dispersing procedure on the molecular weight was investigated. It was found that a modified dispersing procedure gave polyurethane dispersions with higher molecular weight and better tensile strength. Comparing with polyurethane dispersions derived from dimethylolpropionic acid (DMPA), PLACCEL205BA gave polyurethane dispersions with finer particle size indicating that PLACCEL205BA imparted better dispersibility. It was also found that the chemical structure of the polycarbonatediols affected the tensile properties significantly.