Claims
- 1. Poly(ethylene terephthalate) filaments of enhanced dyeability and low shrinkage, characterized by a long-period spacing of more than 300 A and by a differential birefringence (.DELTA..sub.95-5) between the surface and the core of the filament of less than about 0.0055 + 0.0014 .delta..sub.20, where .delta..sub.20 is the stress measured at 20% extension, and is at least about 1.6 gpd.
- 2. A hard yarn comprising filaments according to claim 1, wherein .delta..sub.20 is at least about 2.6 gpd.
- 3. A yarn comprising filaments according to claim 1, whose boil-off shrinkage is less than about 4%.
- 4. Poly(ethylene terephthalate) filaments of enhanced dyeability and low shrinkage, characterized by a long-period spacing of more than 300 A and by a differential birefringence (.DELTA..sub.95-5) between the surface and the core of the filament of less than 0.0065 .delta..sub.20 - 0.0100, where .delta..sub.20 is the stress measured at 20% extension, and is from about 3 to about 4 gpd.
- 5. Poly(ethylene terephthalate) filaments of enhanced dyeability and low shrinkage, characterized by a long-period spacing of more than 300 A and by a differential birefringence (.DELTA..sub.95-5), between the surface and the core of the filament, that is less than about0.0055 + 0.0014.delta..sub.20, where .delta..sub.20 is the stress measured at 20% extension, when .delta..sub.20 is about 1.6 gpd to about 3 gpd, and by a differential birefringence (.DELTA..sub.95-5) that is less than about 0.0065.delta..sub.20 - 0.0100, when .delta..sub.20 is about 3 to about 4 gpd.
- 6. A filament according to claim 5, wherein .delta..sub.20 is at least about 2gpd.
- 7. A hard yarn comprising filaments according to claim 5, wherein .delta..sub.20 is at least about 2.6 gpd.
- 8. A yarn comprising filaments according to claim 5, whose boil-off shrinkage is less than about 4%.
- 9. A yarn according to claim 8, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 10. A hard yarn comprising filaments according to claim 9, wherein .delta..sub.20 is at least about 2.6 gpd.
- 11. A wound package comprising at least 250,000 meters of filaments according to claim 5.
- 12. A wound package comprising at least 250,000 meters of yarn according to claim 5.
- 13. A yarn comprising filaments according to claim 5, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 14. A hard yarn comprising filaments according to claim 5, characterized by a relative disperse dye rate of at least 0.060 as defined herein on page 27, and wherein .delta..sub.20 is at least about 2.6 gpd.
- 15. A filament according to claim 5, wherein the differential birefringence (.DELTA..sub.95-5) is at least about 0.0014.delta..sub.20, when .delta..sub.20 is about 1.6 to about 3 gpd, and is at least about 0.0065.delta..sub.20 - 0.0155, when .delta..sub.20 is about 3 to about 4 gpd.
- 16. A hard yarn comprising filaments according to claim 15, wherein .delta..sub.20 is at least about 2.6 gpd.
- 17. A yarn according to claim 16, whose boil-off shrinkage is less than about 4%.
- 18. A yarn according to claim 17, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 19. A yarn according to claim 18, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 20. Poly(ethylene terephthalate) filaments of enhanced dyeability and low shrinkage, characterized by a long-period spacing of more than 300 A and by a differential birefringence (.DELTA..sub.95-5) between the surface and the core of the filament of less than about 0.008, and by a stress measured at 20% extension (.delta..sub.20) of at least about 1.6 gpd.
- 21. A filament according to claim 20, wherein .delta..sub.20 is at least about 2 gpd.
- 22. A hard yarn comprising filaments according to claim 20, wherein .delta..sub.20 is at least about 2.6 gpd.
- 23. A yarn comprising filaments according to claim 20, whose boil-off shrinkage is less than about 4%.
- 24. A yarn according to claim 23, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 25. A hard yarn comprising filaments according to claim 24, wherein .delta..sub.20 is at least about 2.6 gpd.
- 26. A wound package comprising at least 250,000 meters of yarn according to claim 25.
- 27. A wound package comprising at least 250,000 meters of filaments according to claim 20.
- 28. A yarn comprising filaments according to claim 20, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 29. A hard yarn comprising filaments according to claim 21, characterized by a relative disperse dye rate of at least 0.060 as defined herein on page 27, and wherein .delta..sub.20 is at least about 2.6 gpd.
- 30. A filament according to claim 20, wherein the differential birefringence (.DELTA..sub.95-5) is at least about 0.0014.delta..sub.20, when .delta..sub.20 is about 1.6 to about 3 gpd, and is at least about 0.0065.delta..sub.20 - 0.0155, when .delta..sub.20 is about 3 to about 4 gpd.
- 31. A hard yarn comprising filaments according to claim 30, wherein .delta..sub.20 is at least about 2.6 gpd.
- 32. A yarn according to claim 31, whose boil-off shrinkage is less than about 4%.
- 33. A yarn according to claim 32, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 34. A yarn according to claim 33, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 35. Poly(ethylene terephthalate) filaments of enhanced dyeability and low shrinkage, characterized by a differential birefringence (.DELTA..sub.95-5), between the surface and the core of the filament, that is less than 0.0055 + 0.0014.delta..sub.20, where .delta..sub.20 is the stress measured at 20% extension, when .delta..sub.20 is about 1.6 to about 3 gpd, and that is less than 0.0065.delta..sub.20 - 0.0100, when .delta..sub.20 is about 3 to about 4 gpd, by a crystal size of at least 55 A, being at least (1250 .rho. - 1670) A, where .rho. is the density of the polymer in g/cm.sup.3, and by an amorphous birefringence of less than 0.07.
- 36. A filament according to claim 43, wherein the amorphous birefringence is less than 0.06.
- 37. A hard yarn comprising filaments according to claim 35, and having a modulus .sub.E 3-8 greater than the limiting modulus as the extension increases from 8 to 20%.
- 38. A filament according to claim 35, wherein .delta..sub.20 is at least about 2 gpd.
- 39. A hard yarn comprising filaments according to claim 35, wherein .delta..sub.20 is at least about 2.6 gpd.
- 40. A yarn comprising filaments according to claim 35, whose boil-off shrinkage is less than about 4%.
- 41. A yarn according to claim 40, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 42. A hard yarn comprising filaments according to claim 41, wherein .delta..sub.20 is at least about 2.6 gpd.
- 43. A wound package comprising at least 250,000 meters of yarn according to claim 42.
- 44. A wound package comprising at least 250,000 meters of filaments according to claim 35.
- 45. A yarn comprising filaments according to claim 35, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 46. A yarn comprising filaments according to claim 35, characterized by a relative disperse dye rate of at least 0.060 as defined herein on page 27, and wherein.delta..sub.20 is at least about 2.6 gpd.
- 47. A filament according to claim 35, wherein the differential birefringence (.DELTA..sub.95-5) is at least about 0.0014 .delta..sub.20, when .delta..sub.20 is about 1.6 to about 3 gpd, and is at least about 0.0065.delta..sub.20 - 0.0155, when .delta..sub.20 is about 3 to about 4 gpd.
- 48. A hard yarn comprising filaments according to claim 47, wherein .delta..sub.20 is at least about 2.6 gpd.
- 49. A yarn according to claim 48, whose boil-off shrinkage is less than about 4%.
- 50. A yarn according to claim 49, whose dry heat shrinkage (measured at 160.degree. C) is not more than 1% more than its boil-off shrinkage.
- 51. A yarn according to claim 50, characterized by a relative disperse dye rate of at least 0.050 as defined herein on page 27.
- 52. A yarn according to claim 35, wherein the differential birefringence is less than about 0.008.
- 53. A yarn according to claim 36, wherein the differential birefringence is less than about 0.008.
- 54. A textured multifilament poly(ethylene terephthalate) yarn characterized by a relative disperse dye rate of at least 0.045 as defined herein on page 27, by a loss modulus peak temperature of 115.degree. C or less and by a temperature at the maximum shrinkage tension of at least 258.degree. C.
- 55. A textured yarn according to claim 54, wherein the relative disperse dye rate is at least 0.055.
- 56. Poly(ethylene terephthalate) staple fiber having a loss modulus peak temperature of 115.degree. C or less and a temperature at the maximum shrinkage tension of at least 258.degree. C, and a differential birefringence (.DELTA..sub.95-5) between the surface and core of the fiber of less than 0.0055 + 0.0014.delta..sub.20, where .delta..sub.20 is the stress measured at 20% extension, and is at least 1.6 gpd.
- 57. Poly(ethylene terephthalate) staple fiber having an average crystal size of at least 55 A, and of at least (1250 .rho. - 1670) A, where .rho. is the density of the polymer in g/cm.sup.3, and an amorphous birefringence of less than 0.07, and a differential birefringence (.DELTA..sub.95-5) between the surface and core of the fiber of less than 0.0055 + 0.0014.delta..sub.20, where .delta..sub.20 is the stress measured at 20% extension, and is at least 1.6 gpd.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 694,919, filed June 11, 1976, now abandoned.
US Referenced Citations (7)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
694919 |
Jun 1976 |
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