IP Library › Granted Patent US 7,638,578
Granted Patent B2
US 7,638,578 · App. 12/197,709 · Granted Dec 29, 2009

Aqueous dispersion of crystalline and amorphous polyesters prepared by mixing in water

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Quick Facts
Patent No.
US 7,638,578
App. No.
12/197,709
Granted
Dec 29, 2009
Kind
B2
Abstract

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.

Claims (16)

1. A process, comprising:

mixing a crystalline sulfonated polyester resin in water below its dispersability to form a premixture;

heating the premixture to a temperature of about 50° C. to about 150° C.;

adding an amorphous sulfonated polyester resin to the premixture to form a mixture of resins and water; and

agitating the mixture of resins and water to generate an aqueous dispersion.

2. The process according to claim 1 , wherein the amorphous sulfonated polyester resin is a linear sulfonated amorphous 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 contains a sulfonation between about 1.35 mole % and about 2.0 mole % and the amorphous sulfonated polyester resin contains a sulfonation between about 2.0 mole % and 4.0 mole %.

5. The process according to claim 1 , wherein the water in mixing is heated.

6. The process according to claim 1 , wherein the water in mixing is cooled.

7. The process according to claim 1 , wherein crystalline sulfonated polyester resin is less than 5 weight % of the aqueous dispersion.

8. The process according to claim 1 , wherein a ratio of the crystalline sulfonated polyester resin to the amorphous sulfonated polyester resin present in the aqueous dispersion is from about 10:90 to about 50:50.

9. The process according to claim 1 , wherein a ratio of the crystalline sulfonated polyester resin to the amorphous sulfonated polyester resin present in the aqueous dispersion is from about 10:90 to about 30:70.

10. 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.

11. The process according to claim 1 , wherein the process is conducted substantially free of solvent.

12. The process according to claim 1 , wherein the adding further includes addition of a colorant and/or wax.