Method of imparting delayed wettability of a nonwoven web

Details Method of imparting delayed wettability of a nonwoven web Method of imparting delayed wettability of a nonwoven web

D - Textiles, Paper

04

H

D04H 3/16 (2006.01) D01F 1/10 (2006.01) D01F 6/04 (2006.01) D01F 6/06 (2006.01) D04H 1/42 (2006.01)

Patent

CA 2079139

Abstract A method of forming a nonwoven web having delayed wet- tability, in that the web is not wettable by water upon its formation but becomes wettable within from about three hours to about 30 days thereafter without any post-formation treatment, which method involves the steps of (1) melting a mixture consisting of a thermoplastic polyolefin, an additive, and a retardant coadditive; (2) forming fibers by extruding the resulting melt through under defined conditions of shear and throughput; (3) drawing the fibers; and (4) collecting the fibers on a moving foraminous surface as a web of entangled fibers. The additive is a defined polysiloxane polyether having a molecular weight of from about 700 to about 1,300 and a polydispersity of from about 1.3 to about 3Ø The additive is present in an amount of from about 1.8 to about 3.0 percent by weight, based on the amount of thermo- plastic polyolefin. The retardant coadditive is a high surface area particulate inorganic or organic material which is insoluble in the polymer at both ambient and melt-extrusion temperatures, is present in an amount of from about 0.1 to about 1 percent, based on the weight of the thermoplastic composition, has a surface area of from about 50 to about 500 m2, and is capable of being at least partially coated by the additive. - 20 -

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