Fine fiber media layer
Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
1. A filter media comprising a fine fiber layer and a filtration substrate layer, the fine fiber layer formed on and adhered to the substrate layer, the substrate layer comprising a synthetic polymer, the substrate layer having a thickness of 25 to 800 microns and a basis weight of about 8 to 200 gm-m −2 , the fine fiber layer having a thickness no greater than 30 microns and a basis weight of about 0.5 to 50 g-m −2 , the fine fiber layer comprising fine fiber having a fiber size of about 0.01 to 2 micron.
2. The media of claim 1 wherein after exposure to air at 140° F. and 100% relative humidity for 16 hours at least 50% of the fine fiber remains substantially unchanged for filtration.
3. The media of claim 2 wherein a temperature of 160° F. is used for 3hours.
4. The media of claim 1 wherein the fine fiber has a diameter of 0.01 to 0.5 microns.
5. The media of claim 1 wherein the fine fiber has a diameter of 0.1 to 0.2 microns.
6. The media of claim 1 wherein the substrate layer comprises a spun bonded fabric.
7. The media of claim 1 wherein the substrate layer comprises a woven or non-woven fabric having a basis weight of 0.5 to 150 gm-m −2 .
8. The media of claim 1 wherein the substrate layer comprises a polyolefin.
9. The media of claim 8 wherein the substrate layer comprises a polyethylene.
10. The media of claim 8 wherein the substrate layer comprises a polypropylene.
11. The media of claim 6 wherein the spun bonded fabric comprises polyolefin spun bonded fabric.
12. The media of claim 11 wherein the polyolefin spun bonded fabric comprises polypropylene spun bonded fabric.
13. The media of claim 4 wherein the fine fiber comprises a fiber size of about 0.05 to 0.5 micron.
14. The media of claim 1 wherein the fine fiber comprises an electrospun fiber adhered to the substrate layer.