Patent ID: 8088252
Filing Date: 2012-01-03
Classification: C08F,D04H,D21H

Abstract:
1. A method of making a nonwoven web with a polymeric binder, said method comprising the steps of: i) preparing an emulsion composition by emulsion-polymerizing in an aqueous medium a copolymer resin containing from about 5 to about 50 wt. percent of amino group containing repeat units derived from amino functionalized monomers and from about 50 to about 95 wt. percent of comonomer repeat units derived from other ethylenically unsaturated monomers; ii) converting the emulsion composition to a binder solution by neutralizing the copolymer resin with acid at least until it is water soluble; iii) providing a fibrous web; and iv) applying the binder solution to the nonwoven web, such that the binder solution impregnates the web, thereby at least partially binding the fibers together, wherein the binder provides a characteristic wet strength index of less than 10 in deionized water and a characteristic wet strength index elevation of at least 15 points in a 10% aqueous solution of NaCl.