Water Dispersible Sulfo-Polyester Resins with Controlled Nano-Sized Particles

Water dispersible polyester resins derived from dimethyl terephthalate, dimethyl 5-sulfoisophthalate sodium salt, 1,2-propane diol and diethylene glycol were prepared. ADesign of Experiment (DOE) was explored by varying the concentration of the ionic 5-sulfo-isophthalate sodium salt and diethylene glycol at various molecular weights and found tocorrelate with particle size dispersion of the sulfonated resins in water. An empirical model for the resin glass transition was also obtained through experimental design.