Patent ID: 9194065
Filing Date: 2015-11-24
Classification: D01F,D04H,Y10T

Abstract:
1. A nonwoven web including a plurality of continuous fibers comprising: one or more thermoplastic aliphatic polyesters; and an antishrinkage additive in an amount greater than 0% and no more than 10% by weight of the web, wherein the antishrinkage additive is a thermoplastic semicrystalline polymeric additive that is mixed within the thermoplastic aliphatic polyester; wherein the thermoplastic semicrystalline polymer has a molecular weight of greater than 20,000 daltons and is selected from the group consisting of polyoxymethylene, poly(vinylidine fluoride), poly(ethylene-chlorotrifluoroethylene), poly(vinyl fluoride), poly(ethylene oxide), polycaprolactone, semicrystalline aliphatic polyamides, and thermotropic liquid crystal polymers; wherein the fibers exhibit a median fiber diameter of no greater than about 25 μm; wherein the fibers exhibit molecular orientation and extend substantially endlessly through the web; and further wherein the nonwoven web has at least one dimension in the plane of the web which decreases by no greater than 12% when the web is heated to a temperature above a glass transition temperature but below the melting temperature of the fibers while in an unrestrained condition.