Claims
- 1. A blended polymer foam comprising:a) from 0.1% to 60% by weight of a syndiotactic polypropylene resin; and b) from 40% to 99.9% by weight of a foamable thermoplastic polymer resin, wherein when the foamable thermoplastic polymer resin is isotactic polypropylene, the isotactic polypropylene resin has a tan delta less than 1.5 and the blended polymer foam has a density in the range from 9 kg/m3 to 100 kg/m3.
- 2. The blended polymer foam according to claim 1 wherein the foam has a density of 11 kg/m3 to 100 kg/m3.
- 3. The blended polymer foam according to claim 2 wherein the foam has a density of 15 kg/m3 to 50 kg/m3.
- 4. The blended polymer foam according to claim 1 wherein the foamable thermoplastic polymer resin is a flexible thermoplastic polymer resin.
- 5. The blended polymer foam according to claim 1 wherein the foamable thermoplastic polymer resin is a rigid thermoplastic polymer resin.
- 6. The blended polymer foam according to claim 4 wherein the foamable thermoplastic polymer resin is a flexible polyolefin resin.
- 7. The blended polymer foam according to claim 6 wherein the flexible polyolefin resin is a LDPE resin.
- 8. The blended polymer foam according to claim 7 wherein the LDPE resin has a melt index of from 0.1 dg/minute to 20 dg/minute.
- 9. The blended polymer foam according to claim 1 wherein the syndiotactic polypropylene resin is a homopolymer of propylene.
- 10. The blended polymer foam according to claim 9 wherein the syndiotactic polypropylene resin has a melt flow rate of from 0.1 dg/min to 10 dg/min.
- 11. The blended polymer foam according to claim 9 wherein the syndiotactic polypropylene resin has a syndiotacticity of greater than 75%.
- 12. The blended polymer foam according to claim 1 wherein the syndiotactic polypropylene resin is a copolymer of propylene with ethylene.
- 13. The blended polymer foam according to claim 12 wherein the syndiotactic polypropylene resin has a melt flow rate of from 0.1 dg/min to 10 dg/min.
- 14. The blended polymer foam according to claim 12 wherein the syndiotactic polypropylene resin has a syndiotacticity of greater than 75%.
- 15. The blended polymer foam according to claim 1 wherein the syndiotactic polypropylene resin is a copolymer of propylene with 1-butene.
- 16. The blended polymer foam according to claim 15 wherein the syndiotactic polypropylene resin has a melt flow rate of from 0.1 dg/min to 10 dg/min.
- 17. The blended polymer foam according to claim 15 wherein the syndiotactic polypropylene resin has a syndiotacticity of greater than about 75%.
- 18. The blended polymer foam according to claim 4 wherein the flexible polyolefin resin is an ethylene/vinyl acetate copolymer resin.
- 19. The blended polymer foam according to claim 18 wherein the ethylene/vinyl acetate copolymer resin has a vinyl acetate content of from 5 percent to 30 percent.
- 20. The blended polymer foam according to claim 18 wherein the ethylene/vinyl acetate copolymer resin has a melt index of from 0.2 dg/min to 10 dg/min.
- 21. The blended polymer foam according to claim 4 wherein the flexible polyolefin resin is a foamable isotactic polypropylene resin.
- 22. The blended polymer foam according to claim 21 wherein the foamable isotactic polypropylene resin has a tan delta less than 1.2.
- 23. The blended polymer foam according to claim 5 wherein the rigid thermoplastic polymer resin is a polystyrene resin.
- 24. The blended polymer foam according to claim 23 wherein the polystyrene resin has an average molecular weight of less than 240,000.
- 25. The blended polymer foam according to claim 4 wherein the weight-ratio of the syndiotactic polypropylene resin to the flexible thermoplastic polymer resin in the blended foam is in the range of from 10:90 to 50:50.
- 26. The blended polymer foam according to claim 25 wherein the weight-ratio of the syndiotactic polypropylene resin to the flexible thermoplastic polymer resin in the blended fan is in the range of from 30:70 to 50:50.
- 27. The blended polymer foam according to claim 1 wherein the blended foam is prepared by an extrusion process.
- 28. The blended polymer foam according to claim 27 wherein the extrusion process utilizes isobutane as a blowing agent.
- 29. The blended polymer foam according to claim 27 wherein the extrusion process utilizes carbon dioxide as a blowing agent.
- 30. The blended polymer foam according to claim 1 wherein the blended foam has a cell size of from 0.01 mm to 10 mm.
- 31. The blended polymer foam according to claim 1 wherein the blended foam is uncross-linked.
- 32. The blended polymer foam according to claim 1 wherein the blended foam is cross-linked.
- 33. The blended polymer foam according to claim 1 wherein the blended foam is in the form of a sheet.
- 34. The blended polymer foam according to claim 1 wherein the blended foam is in the form of a plank.
- 35. The blended polymer foam according to claim 1 wherein the blended foam is in the form of a coalesced strand foam plank.
- 36. The blended polymer foam according to claim 1 wherein the blended foam is in the form of beads.
Parent Case Info
This application is a 371 OF PCT/US99/19410 filed Aug. 26, 1999, which claims the benefit of U.S. Ser. No. 60/098,362 filed Aug. 28, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/US99/19410 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/12594 |
3/9/2000 |
WO |
A |
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
6051618 |
Tabaksblat |
Apr 2000 |
A |
Foreign Referenced Citations (1)
Number |
Date |
Country |
08 231747 |
Aug 1992 |
JP |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/098362 |
Aug 1998 |
US |