Steam injection process for preparing polyester latex and apparatus thereof

摘要

The present embodiments disclose processes for preparing a polyester latex containing an amount of residual organic solvent which is less than 100 ppm by weight of the total weight of the polyester latex.

主权项

1. A process of preparing a polyester latex comprising the steps in the following order:
mixing at least one polyester resin with an organic solvent to form a resin mixture; neutralizing the resin mixture by adding a neutralizing agent in water to the resin mixture; emulsifying the resin mixture and neutralizing agent in water by injecting steam into the mixture to form an aqueous emulsion which contains the prepared polyester latex, wherein the aqueous emulsion has a particle size from about 100 to about 280 nm; contacting the aqueous emulsion with deionized water steam for heating to a required temperature; and distilling the mixture of the aqueous emulsion and the deionized water steam under vacuum thereby obtaining the polyester latex containing an amount of residual organic solvent which is less than 100 ppm by weight of the polyester latex under the required temperature of from about 100° C. to about 130° C.