Patent ID: 7851549

Claim:
A process for preparing a curable polyester based emulsion comprising a resin having a desired particle size, the process comprising: selecting at least one of a desired particle size and variability of the desired particle size; forming a curable polyester based emulsion by phase inversion; and controlling a solvent ratio, neutralization ratio, and temperature of the phase inversion according to the transfer functions: Y=Z 1 ·{575−[(447.4)(SR)]−[(163.75)(NR)]+[(0.3285)(T)(SR)]}; and S=Z 2 ·{789−[(2.87)(T)]+[(256.9)(SR)]−[(586.4)(NR)]+[(2.27)(T)(NR)]−[(250.8)(SR)(NR)]}; wherein Y is the desired particle size (in nanometers), S is the variability of the desired particle size (in nanometers), SR is the solvent ratio, NR is the neutralization ratio, T is the temperature (in degrees Kelvin), and Z 1 and Z 2 independently represent error factors of about 0.8 to about 1.2.