Claims
- 1. A fiber comprising a continuous phase of one or more melt processible polyesters of fiber forming molecular weight and one or more melt processible polyolefins selected from the group consisting of polypropylene, polybutylene and polyisobutylene non-uniformly dispersed therein, wherein the weight percent of polyolefin within 50 .ANG. of the surface of said fiber is at least about 50 weight percent based on the total weight of said fiber within said about 50 .ANG. of the surface of the fiber.
- 2. A fiber according to claim 1 wherein said polyester is formed from the condensation of an aliphatic or cycloaliphatic diol, and an aromatic dicarboxylic acid.
- 3. A fiber according to claim 2 wherein said aromatic dicarboxylic acid is selected from the group consisting of terephthalic acid, isophthalic acid and orthophthalic acid.
- 4. A fiber according to claim 3 wherein said aromatic dicarboxylic acid is terephthalic acid.
- 5. A fiber according to claim 2 wherein said diol is an aliphatic diol.
- 6. A fiber according to claim 1 wherein said polyester is selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate) and poly(1,4-cyclohexane dimethylene terephthalate).
- 7. A fiber according to claim 6 wherein said polyester is poly(ethylene terephthalate).
- 8. A fiber according to claim 1 wherein said polyolefin is polypropylene.
- 9. A fiber according to claim 1 wherein the amount of said polyolefins in said fiber is from about 0.5 to about 25 weight percent based on the total weight of the fiber.
- 10. A fiber according to claim 9 wherein the amount of said polyolefins in said fiber is from about 1 to about 15 weight percent.
- 11. A fiber according to claim 10 wherein the amount of said polyolefins in said fiber is from about 2.5 to about 10 weight percent.
- 12. A fiber according to claim 11 wherein the amount of said polyolefins in said fiber is from about 3 to about 8.5 weight percent.
- 13. A fiber according to claim 1 wherein the amount of said polyolefin within said about 50 .ANG. of the surface of said fiber is at least about 80 percent by weight.
- 14. A fiber according to claim 13 wherein the amount of said polyolefin within said about 50 .ANG. of the surface of said fiber is at least about 85 percent by weight.
- 15. A fiber according to claim 1 wherein said polyolefin is of fiber forming molecular weight.
- 16. The fiber according to claim 14 wherein the amount of said polyolefin within said about 50 .ANG. of the surface of said fiber is from about 85 percent by weight to about 98 percent by weight.
- 17. A fiber according to claim 1 wherein said fiber is a filament or a plurality of filaments.
- 18. A fiber according to claim 17 wherein said fiber is a filament of substantially circular cross section.
- 19. A fiber according to claim 17 wherein said fiber is a filament of multilobal cross section.
- 20. A fiber according to claim 19 wherein said multilobal fiber has at least about 3 irregular or regular lobes or vanes projecting from the longitudinal axis of said fiber.
- 21. A fiber according to claim 20 wherein said fiber has at least about 4 projecting lobes or vanes.
- 22. A fiber according to claim 19 wherein the mod ratio of the fiber is at least about 1.8.
- 23. A fiber according to claim 22 wherein the mod ratio of the fiber is from about 2.0 to about 7.0.
- 24. A fiber according to claim 23 wherein the mod ratio of the fiber is from about 2.2 to about 5.
- 25. A fiber which comprises a major amount of a continuous phase comprising one or more melt processible polyesters of fiber forming molecular weight and a minor amount of one or more melt processible polyolefins non-uniformly dispersed in said continuous phase such that the concentration of said polyolefins within at least 50 .ANG. of the surface of said fiber is greater than the concentration of said polyesters within at least 50 .ANG. of the surface of said fiber, wherein said fiber is multi-lobal having at least 4 irregular or regular shaped lobes or vanes projecting from the longitudinal axis of said fiber.
- 26. A fiber according to claim 25 wherein:
- said polyolefin is polypropylene and said polyester is poly(ethylene terephthalate); and
- said polyolefin in said fiber is from about 0.5 to about 25 weight percent based on the total weight of the fiber and wherein the weight percent of polyolefin within said about 50 .ANG. of the surface of the fiber is at least about 85 percent by weight based on the total weight of said fiber within 50 .ANG. of the surface of the fiber.
- 27. A fiber according to claim 25 wherein said fiber is hexalobal.
- 28. A fiber according to claim 26 wherein the amount of polypropylene within said about 50 .ANG. of the surface of said fiber is from about 85% to about 98% by weight.
- 29. A fiber according to claim 28 wherein the amount of polypropylene in said fiber is from about 1 to about 15% by weight.
- 30. A fiber according to claim 29 wherein the amount of in said fiber polypropylene is from about 2.5 to about 10% by weight.
- 31. A fiber according to claim 30 wherein the amount of in said fiber polypropylene is from about 3 to about 8.5% by weight.
Parent Case Info
This application is a division of application Ser. No. 300,194, filed 1/23/89, now U.S. Pat. No. 4,908,052, which is a continuation of U.S. Ser. No. 040,446, filed 4/20/87.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1194704 |
May 1966 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
300194 |
Jan 1989 |
|