초록

Melt-processible, thermoplastic polyethylene compositions of high resistance against wear are disclosed and methods for making and processing same. Additionally, products comprising these compositions are described.

대표청구항 ▼

What is claimed is: 1. A sliding member comprising a polyethylene having: a weight average molecular weight in the range of 150,000-500,000 g/mol; a number average molecular weight of more than 50,000 g/mol; a polydispersity in the range of 1.3-10; and wherein said polyethylene comprises co-monomer

What is claimed is: 1. A sliding member comprising a polyethylene having: a weight average molecular weight in the range of 150,000-500,000 g/mol; a number average molecular weight of more than 50,000 g/mol; a polydispersity in the range of 1.3-10; and wherein said polyethylene comprises co-monomer, said co-monomer being present in less than 3 mol % and in the range of 0.5-10 wt. %, and wherein said co-monomer is selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-pentene, 1-hexene, and 1-octene. 2. The sliding member of claim 1, wherein said polyethylene has a wear coefficient below 2.9��10-4 mm3/mN. 3. The sliding member according to claim 1, wherein said polyethylene has a weight average molecular weight below 400,000 g/mol. 4. The sliding member according to claim 1, wherein said polyethylene has a weight average molecular weight of at least 250,000 g/mol. 5. The sliding member according to claim 1, wherein said polyethylene has a polydispersity below 5. 6. The sliding member according to claim 1, wherein said polyethylene has a polydispersity in the range of 2-4. 7. The sliding member according to claim 1, wherein said polyethylene has a melting point of at least 100�� C. 8. The sliding member according to claim 1, wherein said polyethylene has a melt viscosity of less than 5��105 Pa.s. 9. The sliding member according to claim 1, wherein said polyethylene has a number average molecular weight of at least 100,000 g/mol. 10. The sliding member of claim 1, said polyethylene having: a weight average molecular weight below 400,000 g/mol; and a number average molecular weight of more than 75,000 g/mol; and a polydispersity in the range of 1.75-5. 11. The sliding member of claim 1, wherein said polyethylene has a melting point of at least 115�� C. 12. The sliding member of claim 1, wherein said polyethylene has a melting point of at least 125�� C. 13. The sliding member of claim 1, wherein said co-monomer content is at least about 1 wt %. 14. The sliding member of claim 1, wherein said co-monomer content is less than about 5 wt %. 15. The sliding member of claim 13, wherein said co-monomer content is less than about 5 wt %. 16. The sliding member of claim 1, wherein said polyethylene has a crystallinity in the range of about 15% to about 55%. 17. The sliding member of claim 1, wherein said polyethylene has a melt viscosity of less than 5��105 Pa.s. 18. Polyethylene having: a weight average molecular weight in the range of 150,000-500,000 g/mol; a number average molecular weight of more than 50,000 g/mol; a polydispersity in the range of 1.3-10; and wherein said polyethylene comprises co-monomer, said co-monomer being present in less than 3 mol %, and wherein said polyethylene has a wear coefficient below 2.0��10-4 mm3/mN. 19. Polyethylene having: a weight average molecular weight in the range of 150,000-500,000 g/mol; a number average molecular weight of more than 50,000 g/mol; a polydispersity in the range of 1.3-10; and a wear coefficient below 2.0��10-4 mm3/mN; wherein said polyethylene comprises co-monomer, said co-monomer being present in less than 3 mol %, wherein said co-monomer is selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-pentene, 1-hexene, and 1-octene. 20. A process comprising melt-processing the polyethylene according to claim 18. 21. The process of claim 20, wherein said process includes injection molding said polyethylene. 22. An article obtained by the process according to claim 20. 23. The article of claim 22, wherein said article is a fiber. 24. The article of claim 22, wherein said article is a lining. 25. A sliding member comprising a polyethylene having: a weight average molecular weight in the range of 100,000-400,000 g/mol; a umber average molecular weight of more than 25,000 g/mol; a polydispersity in the range of 1.3 to 8; and wherein said polyethylene comprises co-monomer; said co-monomer consisting essentially of alpha-olefin co-monomer containing 3-20 carbon atoms; and said co-monomer being present in less than 3 mol %. 26. The sliding member of claim 25, wherein said co-monomer content is at least 1 wt %. 27. The sliding member of claim 26, wherein said co-monomer content is less than about 10 wt %. 28. The sliding member of claim 26, wherein said co-monomer content is less than about 5 wt %. 29. The sliding member of claim 25, wherein said co-monomer is selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, and 1-octene. 30. The sliding member of claim 28, wherein said co-monomer is selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, and 1-octene. 31. The sliding member of claim 25, wherein said co-monomer is 1-octene. 32. The sliding member of claim 28, wherein said co-monomer is 1-octene. 33. The sliding member of claim 25, wherein said polyethylene has a melting point of at least 115�� C. 34. The sliding member of claim 25, wherein said polyethylene has a crystallinity in the range of about 15% to about 55%. 35. The sliding member of claim 25, wherein said polyethylene has a co-monomer content of 1-5 wt %, a melting point of at least 105�� C., and a crystallinity in the range of about 15% to about 55%. 36. The sliding member according to claim 25, wherein said polyethylene has a polydispersity below 5. 37. The sliding member according to claim 25, wherein said polyethylene has a polydispersity in the range of 2-4. 38. The sliding member according to claim 28, wherein said polyethylene has a polydispersity in the range of 2-4. 39. The sliding member of claim 25, wherein said polyethylene has a wear coefficient below 2.9��10-4 mm3/mN. 40. The sliding member of claim 25, wherein said polyethylene has a wear coefficient of at most about 2.4��10-4 mm3/mN. 41. A process comprising injection molding the polyethylene of claim 25 to form said sliding member. 42. A process comprising injection molding the polyethylene of claim 28 to form said sliding member.