Patent ID: 7851519

Claim:
A method of making a crosslinked polyester resin emulsion, comprising: solvent flashing a mixture of a polyester resin, an initiator, a solvent, and an emulsion medium, the solvent flashing comprising: mixing said polyester resin, said initiator, said solvent, said emulsion medium, and optionally a stabilizer to form a combined mixture; and heating the combined mixture at a temperature above a boiling point of said solvent but below a boiling point of said emulsion medium, wherein the crosslinked polyester resin has a degree of crosslinking of from about 0.1 percent to about 100 percent, the polyester resin is amorphous propoxylated bisphenol A fumarate resin, the solvent is ethyl acetate, and the initiator is 2,2′-Azobis(2,4-dimethyl)valeronitrile, which is substantially unreactive at temperatures up to and including 65° C. but is reactive at temperatures above 65° C., such that substantially no crosslinking takes place below 65° C. and substantially all of the crosslinking should take place during the heating step.