Two fiber filtration material
A filtration material comprising a blend of at least two types of fibers: (a) polypropylene fibers and (b) either acrylic or modacrylic fibers. In a preferred embodiment, the blend contains about 50 weight percent polypropylene fibers and about 50 weight percent modacrylic fibers. In another preferred embodiment, the blend contains about 50 weight percent polypropylene fibers and about 50 weight percent acrylic fibers. The fibers can be blended ranging from 90:10 to 10:90 polypropylene to acrylic or modacrylic. At least one type of fibers includes an extractable agent on the outer surfaces thereof. Performance of the blend is superior to the prior art filtration materials, especially at the preferred compositions.
1. A filter material comprising a blend of (a) polypropylene fibers with measurable amounts of at least one extractable agent on outer surfaces thereof, and (b) fibers of a second type selected from a group consisting of acrylic and modacrylic, wherein the measurable amount of said at least one extractable agent is within a range of about 0.02 to about 0.1 weight percent, and wherein said at least one extractable agent is an agent used in a process to make fibers and is selected from a group consisting of lubricant and an anti-static agent.
2. The filter material in accordance with claim 1 , wherein the blend contains polypropylene fibers and the second type of fibers in a ratio between about 10:90 and about 90:10.
3. The filter material in accordance with claim 2 , wherein the blend contains polypropylene fibers and the second type of fibers in a ratio between about 20:80 and about 80:20.
4. The filter material in accordance with claim 3 , wherein the blend contains polypropylene fibers and the second type of fibers in a ratio between about 30:70 and about 70:30.
5. The filter material in accordance with claim 4 , wherein the blend contains polypropylene fibers and the second type of fibers in a ratio between about 40:60 and about 60:40.
6. The filter material in accordance with claim 5 , wherein the blend contains polypropylene fibers and the second type of fibers in a ratio between about 45:55 and about 55:45.
7. The filter material in accordance with claim 6 , wherein the blend comprises about 50 weight percent polypropylene fibers and about 50 weight percent of the second type of fibers.
8. The filter material in accordance with claim 1 , wherein the blend contains polypropylene fibers and acrylic fibers in a ratio between about 20:80 and about 80:20.
9. The filter material in accordance with claim 8 , wherein the blend contains polypropylene fibers and acrylic fibers in a ratio between about 30:70 and about 70:30.
10. The filter material in accordance with claim 9 , wherein the blend contains polypropylene fibers and acrylic fibers in a ratio between about 40:60 and about 60:40.
11. The filter material in accordance with claim 10 , wherein the blend contains polypropylene fibers and acrylic fibers in a ratio between about 45:55 and about 55:45.
12. The filter material in accordance with claim 11 , wherein the blend comprises about 50 weight percent polypropylene fibers and about 50 weight percent acrylic fibers.
13. The filter material in accordance with claim 1 , wherein the blend contains polypropylene fibers and modacrylic fibers in a ratio between about 20:80 and about 80:20.
14. The filter material in accordance with claim 13 , wherein the blend contains polypropylene fibers and modacrylic fibers in a ratio between about 30:70 and about 70:30.
15. The filter material in accordance with claim 14 , wherein the blend contains polypropylene fibers and modacrylic fibers in a ratio between about 40:60 and about 60:40.
16. The filter material in accordance with claim 15 , wherein the blend contains polypropylene fibers and modacrylic fibers in a ratio between about 45:55 and about 55:45.
17. The filter material in accordance with claim 16 , wherein the blend comprises about 50 weight percent polypropylene fibers and about 50 weight percent modacrylic fibers.
18. The filter material in accordance with claim 1 , wherein the second type of fibers comprises acrylic fibers which are substantially free of extractable agents.
19. The filter material in accordance with claim 1 , wherein the second type of fibers comprises acrylic fibers which contain measurable amounts of at least one extractable agent.
20. The filter material in accordance with claim 19 , wherein said at least one extractable agent is an agent used in a process to make the acrylic fibers.
21. The filter material in accordance with claim 1 , wherein the second type of fibers comprises modacrylic fibers which are substantially free of extractable agents.
22. The filter material in accordance with claim 1 , wherein the second type of fibers comprises modacrylic fibers which contain measurable amounts of at least one extractable agent.
23. The filter material in accordance with claim 22 , wherein said at least one extractable agent is an agent used in a process to make the modacrylic fibers.
24. The filter material in accordance with claim 1 , wherein the polypropylene fibers are not cleaned to remove said at least one extractable agent.
25. The filter material in accordance with claim 1 , wherein said at least one extractable agent is an agent used in a process to make the polypropylene fibers.
26. A filter material comprising a blend of (a) polypropylene fibers, and (b) fibers of a second type with about 0.02 to about 0.1 weight percent of at least one extractable agent on outer surfaces thereof, said fibers being selected from a group consisting of acrylic and modacrylic, and wherein said at least one extractable agent is an agent used in a process to make fibers and is selected from a group consisting of lubricant and an anti-static agent.
27. The filter material in accordance with claim 26 , wherein the polypropylene fibers have measurable amounts of at least one extractable agent on outer surfaces thereof.
28. The filter material in accordance with claim 26 , wherein said at least one extractable agent is an agent used in a process to make the fibers of a second type.
29. The filter material in accordance with claim 27 , wherein said at least one extractable agent is an agent used in a process to make the polypropylene fibers.