Claims
- 1. A thermoformed disposable food container having a wall caliper of from about 10 to about 80 mils consisting essentially of from about 30 to about 80 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 10 to about 50 percent mica, from about 2.5 to about 25 percent calcium carbonate, and up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of less than about 8 microns.
- 2. The thermoformed disposable food container according to claim 1, wherein the calcium carbonate has a mean particle size of about 6 microns or less.
- 3. The thermoformed disposable food container according to claim 2, wherein the calcium carbonate has a mean particle size of less than about 5 microns.
- 4. The thermoformed disposable food container according to claim 3, wherein the calcium carbonate has a mean particle size of about 3 microns or less.
- 5. The thermoformed disposable food container according to claim 4, wherein the calcium carbonate has a mean particle size of less than about 2.5 microns.
- 6. The thermoformed disposable food container according to claim 5, wherein the calcium carbonate has a mean particle size of about 1 micron or less.
- 7. The thermoformed disposable food container according to claim 1, wherein calcium carbonate is present in an amount of from about 5 to about 15 percent by weight of said container.
- 8. The thermoformed disposable food container according to claim 1, wherein mica is present in an amount of from about 20 to about 40 percent by weight of said container.
- 9. The thermoformed disposable food container according to claim 1, wherein said matrix polymer composition consists of a polypropylene polymer and a polyethylene polymer.
- 10. The thermoformed disposable food container according to claim 9, wherein said polyethylene polymer is present in an amount of from about 1 to about 15 percent by weight of said container.
- 11. The thermoformed disposable food container according to claim 10, wherein said polyethylene polymer composition is present in an amount of from 2.5 to about 7.5 percent by weight of said container.
- 12. The thermoformed disposable food container according to claim 11, wherein said polyethylene polymer is HDPE.
- 13. The thermoformed disposable food container according to claim 9, wherein said polypropylene polymer is present in an amount of from about 40 to about 60 percent by weight of said container.
- 14. The thermoformed disposable food container according to claim 13, wherein said polypropylene polymer is isotactic polypropylene.
- 15. The thermoformed disposable food container according to claim 10, wherein titanium dioxide is present in an amount of from about 0.5 to about 4 percent by weight of said container.
- 16. The thermoformed disposable food container according to claim 1, having a wall caliper of from about 10 to about 50 mils.
- 17. The thermoformed disposable food container according to claim 16, having a wall caliper of from about 15 to about 25 mils.
- 18. A thermoformed disposable food container having a wall caliper of from about 10 to about 50 mils consisting essentially of from about 40 to about 70 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 6 microns.
- 19. A thermoformed disposable food container having a wall caliper of from about 10 to about 50 mils consisting essentially of from about 40 to about 70 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 3 microns.
- 20. A thermoformed disposable food container having a wall caliper of from about 10 to about 50 mils consisting essentially of from about 40 to about 70 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 1 micron.
- 21. An extrudable composition consisting essentially of from about 30 to about 80 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 10 to about 50 percent mica, from about 2.5 to about 25 percent calcium carbonate, and up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of less than about 8 microns.
- 22. The extrudable composition according to claim 21, wherein the calcium carbonate has a mean particle size of about 6 microns or less.
- 23. The extrudable composition according to claim 22, wherein the calcium carbonate has a mean particle size of less than about 5 microns.
- 24. The extrudable composition according to claim 23, wherein the calcium carbonate has a mean particle size of about 3 microns or less.
- 25. The extrudable composition according to claim 24, wherein the calcium carbonate has a mean particle size of less than about 2.5 microns.
- 26. The extrudable composition according to claim 25, wherein the calcium carbonate has a mean particle size of about 1 micron or less.
- 27. An extrudable composition consisting essentially of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 6 microns.
- 28. An extrudable composition consisting essentially of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 3 microns.
- 29. An extrudable composition consisting essentially of a polypropylene polymer and optionally including a polyethylene polymer, from about 20 to about 40 percent mica, from about 2.5 to about 25 percent by weight calcium carbonate, up to about 5 weight percent titanium dioxide, wherein the calcium carbonate has a mean particle size of about 6 microns thermoformed disposable food container according to claim 31, wherein the calcium carbonate has a mean particle size of about 1 micron.
CLAIM FOR PRIORITY
[0001] This non-provisional application claims the benefit of the filing date of U.S. Provisional Patent Application Serial No. 60/366,790, of the same title, filed Mar. 22, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60366790 |
Mar 2002 |
US |