Application of dispersed materials to cellulosic fibers

Claim 1

IN A METHOD OF MAKING A FORMED CELLULOSIC PRODUCT BY THE STEPS OF PREPARING AN AQUEOUS SUSPENSION OF FIBROUS CELLULOSIC MATERIAL, IMPREGNATING THE CELLULOSIC MATERIAL WITH A WATERINSOLUBLE HYDROPHOBIC ORGANIC IMPREGNATING AGENT AND FORMING THE IMPREGNATED CELLULOSIC MATERIAL INTO A FELTED PRODUCT, THE IMPROVEMENT WHICH CONSISTS IN FIRST ADDING A PARTIALLY POLYMERIZED HYDROPHILIC CATIONIC UREA-FORMALDEHYDEPOLYFUNCTIONAL ORGANIC NITROGEN BASE RESIN TO THE AQUEOUS FIBROUS SUSPENSION, SAID CATIONIC RESIN BEING FORMED BY THE CONDENSATION OF A UREAFORMALDEHYDE REACTION PRODUCT WITH A WATERSOLUBLE POLYFUNCTIONAL ORGANIC NITROGEN BASE UNDER ACID CONDITIONS, THEN ADDING AN AQUEOUS DISPERSION OF THE ORGANIC IMPREGNATING AGENT IN DEFLOCCULATED CONDITION AND THEREBY IMMEDIATELY FLOCCULATING THE IMPREGNATING AGENT IN THE CELLULOSIC FIBROUS SUSPENSION BY THE ACTION OF THE CATIONIC UREA-FORMALDEHYDE-POLYFUNCTIONAL ORGANIC NITROGEN BASE RESIN, AND THEREBY DEPOSITING A SUBSTANTIAL PROPORTION OF THE IMPREGNATING AGENT UNIFORMLY ON THE FIBERS.