Claims
- 1. A mat material containing non-woven melt-spun polymeric filaments of which at least some intersect each other and are fused together at least at some of the points of intersection, said filaments having a diameter of from 0.2 to 3 mm. and a plurality of adjacent, separate, uniform, discontinuous cavities enclosed in an external shell, said cavities comprising hollow spaces having between 20 and 80 volume % of each filament.
- 2. The mat material of claim 1 wherein the filaments contain up to 1 weight %, based on the weight of the melt, of a silicone oil.
- 3. The mat material of claim 2 wherein the filaments are composed of polycaprolactam and contain 0.2 to 0.4 weight % based on the weight of the melt, of a silicone oil.
- 4. The mat of claim 2 wherein the filaments are composed of polyethylene terephthalate, and contain 0.1 to 0.3 weight %, based on the weight of the melt, of a silicone oil.
- 5. A mat comprising melt spun non-woven polymeric filaments which contain a plurality of substantially non-communicating hollow spaces separated by polymeric walls which resist compression of the filament under load, said filaments having a cross section of from about 0.2 to about 3 millimeters and being fuse bonded together at mutual points of contact, and from about 20 to about 80% of the total volume of the filament being occupied by hollow spaces comprising adjacent, separate, uniform, discontinuous, needle-shaped cavities enclosed in an external shell.
- 6. The mat material of claim 2 wherein the filaments contain from about 0.1 to about 0.4 weight % of a silicone oil based on the weight of the melt.
- 7. The mat material of claim 1 wherein the cavities in each filament make up between 40 and 70 volume % of the filament, based on the total volume enclosed within the outer shell of the filament.
- 8. The mat of claim 5 wherein the cavities in each filament make up between 40 and 70 volume % of the filament, based on the total volume enclosed within the outer shell of the filament.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2550070 |
Nov 1975 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 738,985, filed Nov. 4, 1976, now abandoned.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
738985 |
Nov 1976 |
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