Polyesters and polyester containers having a reduced coefficient of friction and improved clarity
View Patent ↗Polyesters and polyester containers having a reduced coefficient of friction and improved clarity are produced using an antiblock agent comprising a dried talc having from about 20 to about 300 ppm water or a fatty acid tethered talc. The use of these talcs results in polyesters and polyester containers having a coefficient of less than about 1.0 and a clarity with haze values of less than about 4%.
1. A method for making a polyester polymer, comprising adding about 0.001 to about 0.1 wt % talc containing from about 20 to about 300 ppm water to a process for the production of a polyester polymer, and forming a polyester polymer having a coefficient of friction from about 0.01 to about 1.0.
2. The method of claim 1 , wherein the method comprises adding about 0.001 to about 0.05 wt % talc to said process for the production of a polyester polymer.
3. The method of claim 1 , wherein the method comprises adding about 0.001 to about 0.02 wt % talc to said process for the production of a polyester polymer.
4. The method of claim 1 , wherein the polyester polymer produced has a haze value of from about 0.1% to about 4%.
5. The method of claim 1 , wherein the talc has an average particle size from about 0.05 microns to about 50 microns.
6. The method of claim 1 , wherein the talc contains from about 50 to about 250 ppm water.
7. The method of claim 1 , wherein the talc is a tethered talc.
8. The method of claim 7 , wherein the talc has been treated with a fatty acid to produce a tethered talc.
9. The method of claim 1 , wherein the polyester polymer produced comprises poly(ethyleneterephthalate), poly(ethylenenaphthalate), poly(ethyleneisophthalate), or poly(ethylenebutyleneterephthalate).
10. The method of claim 1 , wherein the polyester polymer produced comprises poly(ethyleneterephthalate).
11. A method for making a concentrate, comprising blending talc containing from about 20 to about 300 ppm water with a polyester polymer to form a concentrate, wherein said concentrate is useful for making a polyester polymer having a coefficient of friction from about 0.01 to about 1.0.
12. A method for making a polyester polymer, comprising blending talc containing from about 20 to about 300 ppm water with a polyester polymer to form a concentrate, and then blending said concentrate with a virgin polyester polymer to form a polyester polymer having a coefficient of friction from about 0.01 to about 1.0.
13. The method of claim 12 , wherein said polyester polymer having a coefficient of friction from about 0.01 to about 1.0 has a final concentration of about 0.001 to about 0.05 wt % talc.
14. The method of claim 12 , wherein said polyester polymer having a coefficient of friction from about 0.01 to about 1.0 has a final concentration of about 0.001 to about 0.02 wt % talc.
15. The method of claim 12 , wherein said polyester polymer having a coefficient of friction from about 0.01 to about 1.0 has a haze value of from about 0.1% to about 4%.
16. The method of claim 12 , wherein the talc has an average particle size from about 0.05 microns to about 50 microns.
17. The method of claim 12 , wherein the talc contains from about 50 to about 250 ppm water.
18. The method of claim 12 , wherein the talc is a tethered talc.
19. The method of claim 18 , wherein the talc has been treated with a fatty acid to produce a tethered talc.
20. The method of claim 12 , wherein the polyester polymer having a coefficient of friction from about 0.01 to about 1.0 comprises poly(ethyleneterephthalate), poly(ethylenenaphthalate), poly(ethyleneisophthalate), or poly(ethylenebutyleneterephthalate).
21. The method of claim 12 , wherein the polyester polymer having a coefficient of friction from about 0.01 to about 1.0 comprises poly(ethyleneterephthalate).