Patent ID: 9464369
Filing Date: 2016-10-11
CPC Classification: A61F,B01D,D01D,D04H,Y10T

Claim Text:
1. A nonwoven web comprising: a first layer of spunbond fibers; a second layer of spunbond fibers; and at least one nanofiber layer disposed between said first and second layers of spunbond fibers, said nanofiber layer comprising at least 50% nanofibers with a diameter ranging from 500-900 nanometers, said nanofiber layer having a basis weight of less than about 25 gsm, a mean pore diameter of less than about 15 microns, and a coefficient of variation in at least one of the following of less than 20%: pore diameter, basis weight, air permeability, and/or opacity; wherein the nonwoven web has a hydrohead greater than 10 mbar and air permeability greater than 1 m/min, wherein a product of the hydrohead and the air permeability divided by the basis weight is greater than about 500 mbar*meter per minute per gsm.