Preparing aqueous dispersion of crystalline and amorphous polyesters
View Patent ↗Processes for generating aqueous dispersions for use in the emulsion/aggregation technique, by combining crystalline polyester resin, amorphous polyester resin and water, heating and agitating the mixture and generating an aqueous dispersion containing both crystalline polyester resin particles and amorphous polyester resin particles.
1. A process, comprising:
melt-mixing a crystalline sulfonated polyester resin and an amorphous sulfonated polyester resin at a temperature of about 90° C. to about 220° C.;
heating water to a temperature of about 50° C. to about 150° C.;
adding the mixture of resins into the heated water; and
agitating the mixture and the water to generate an aqueous dispersion.
2. The process according to claim 1 , wherein the amorphous polyester resin is a linear amorphous sulfonated polyester resin or a branched amorphous sulfonated polyester resin.
3. The process according to claim 1 , wherein the crystalline sulfonated polyester resin and amorphous sulfonated polyester resin each contain a sulfonation between about 1.0 mole % and about 5.0 mole %.
4. The process according to claim 1 , wherein the crystalline sulfonated polyester resin is less than 5 weight % of the aqueous dispersion.
5. The process according to claim 1 , wherein a ratio of the crystalline sulfonated polyester resin to the amorphous polyester resin in the aqueous dispersion is from about 10:90 to about 50:50.
6. The process according to claim 1 , wherein the resins form particles in the aqueous dispersion, having a size of between about 10 nm and 400 nm.
7. The process according to claim 1 , wherein the process is conducted substantially free of solvent.
8. The process according to claim 1 , wherein the adding further includes addition of a colorant and/or wax.