Polyester resins and polyester containers having reduced frictional properties
View Patent ↗The invention embraces polyester resins and containers that include surface-modified talc. The invention also embraces a method for the late introduction of surface-modified talc via a reactive carrier to achieve a polyester resin that is capable of being formed into low-haze, high-clarity bottles possessing reduced coefficient of friction.
1. A polyester bottle resin, comprising polyethylene terephthalate and less than about 200 ppm of surface-modified talc having an average particle size of less than about ten microns.
2. A polyester bottle resin according to claim 1 , comprising less than about 100 ppm of surface-modified talc.
3. A polyester bottle resin according to claim 2 , comprising more than about 20 ppm of surface-modified talc.
4. A polyester bottle resin according to claim 1 , comprising between about 40 and 100 ppm of surface-modified talc.
5. A polyester bottle resin according to claim 1 , wherein the surface-modified talc comprises talc treated with an organosilane coupling agent.
6. A polyester bottle resin according to claim 5 , comprising between about 40 and 100 ppm of surface-modified talc.
7. A polyester bottle resin according to claim 1 , wherein the surface-modified talc comprises talc treated with an aminosilane coupling agent.
8. A polyester bottle resin according to claim 1 , comprising a polyol having a molecular weight of between about 300 and 10,000 g/mol, wherein the polyol (i) is the delivery vehicle for the introduction of the surface-modified talc into the polyethylene terephthalate and (ii) is present in the polyester resin in an amount less than about one weight percent.
9. A polyester bottle resin according to claim 8 , wherein the polyol is present in the polyester resin in an amount less than about 500 ppm.
10. A polyester bottle resin according to claim 1 , comprising polyethylene glycol having a molecular weight of less than about 10,000 g/mol, wherein the polyethylene glycol (i) is a reactive carrier that introduces the surface-modified talc into the polyethylene terephthalate and (ii) is present in the polyester resin in an amount less than about 0.1 weight percent.
11. A polyester bottle resin, comprising polyethylene terephthalate and less than about 200 ppm of surface-modified talc having an average particle size of less than about two microns.
12. A polyester bottle resin according to claim 11 , comprising less than about 100 ppm of surface-modified talc.
13. A polyester bottle resin according to claim 12 , comprising more than about 20 ppm of surface-modified talc.
14. A polyester bottle resin according to claim 11 , comprising between about 40 and 100 ppm of surface-modified talc.
15. A polyester bottle resin according to claim 11 , wherein the surface-modified talc comprises talc treated with an organosilane coupling agent.
16. A polyester bottle resin according to claim 15 , comprising between about 40 and 150 ppm of surface-modified talc treated with an organosilane coupling agent.
17. A polyester bottle resin according to claim 16 , wherein the surface-modified talc comprises talc treated with an aminosilane coupling agent at a loading of between about 0.5 and one weight percent.
18. A polyester bottle resin according to claim 15 , comprising between about 60 and 100 ppm of surface-modified talc treated with an organosilane coupling agent.
19. A polyester bottle resin according to claim 11 , comprising polyethylene glycol having a molecular weight of less than about 10,000 g/mol, wherein the polyethylene glycol (i) is a reactive carrier that introduces the surface-modified talc into the polyethylene terephthalate and (ii) is present in the polyester resin in an amount less than about 500 ppm.
20. A polyester container, comprising:
polyethylene terephthalate polymers; and
surface-modified talc having an average particle size of less than about ten microns, the surface-modified talc being present in said polyester container in an amount less than about 200 ppm.
21. A polyester container according to claim 20 , wherein the surface-modified talc has an average particle size of less than about two microns.
22. A polyester container according to claim 20 , wherein the surface-modified talc is present in said polyester container in an amount between about 40 and 150 ppm.
23. A polyester container according to claim 20 , wherein the surface-modified talc is present in said polyester container in an amount between about 60 and 100 ppm.
24. A polyester container according to claim 20 , wherein the surface-modified talc is treated with an organosilane coupling agent.
25. A polyester container according to claim 20 , wherein, as compared with an otherwise identical container without talc, said polyester container possesses reduced coefficient of friction and comparable sidewall haze.
26. A polyester container according to claim 20 , wherein, as compared with an otherwise identical container without talc, said polyester container possesses reduced coefficient of friction of about 90 percent.
27. A polyester container according to claim 20 , wherein said polyester container is a straight-walled two-liter soft drink bottle.
28. A polyester container, comprising:
polyethylene terephthalate polymers; and
less than about 200 ppm of surface-modified talc having an average particle size of less than about ten microns;
wherein said polyester container possesses reduced coefficient of friction as compared with an otherwise identical talc-free container.
29. A polyester container according to claim 28 , wherein the surface-modified talc has an average particle size of less than about two microns.
30. A polyester container according to claim 29 , wherein the surface-modified talc is present in said polyester container in an amount less than 150 ppm.
31. A polyester container according to claim 28 , wherein the surface-modified talc is present in said polyester container in an amount less than 100 ppm.
32. A polyester container according to claim 31 , wherein the surface-modified talc is present in said polyester container in an amount more than 20 ppm.
33. A polyester container according to claim 28 , wherein the surface-modified talc is treated with an organosilane coupling agent.
34. A polyester bottle, comprising:
polyethylene terephthalate polymers; and
talc treated with a organosilane coupling agent, the talc being present in said polyester bottle in an amount between about 40 and 150 ppm;
wherein, as compared with an otherwise identical polyester bottle without talc, said polyester bottle possesses reduced coefficient of friction; and
wherein, as compared with an otherwise identical polyester bottle that includes talc without surface modification, said polyester bottle possesses reduced sidewall haze.
35. A polyester bottle according to claim 34 , wherein the organosilane-treated talc has an average particle size of less than about ten microns.
36. A polyester bottle according to claim 34 , wherein the organosilane-treated talc has an average particle size of less than about two microns.
37. A polyester bottle according to claim 34 , wherein, as compared with an otherwise identical talc-free bottle, said polyester bottle possesses a 90-percent reduction in coefficient of friction.