Preparing wet strength paper using polyarylbiguanide-urea resin

Claim 1

A METHOD OF PRODUCING WET STRENGTH PAPER WHICH COMPRISES APPLYING TO THE FIBERS THEREOF ABOUT 0.1% TO 5% OF A RESINOUS COMPOSITION COMPRISING A UREA-FORMALDEHYDE RESIN HAVING INTERCONDENSED THEREIN A WATER-SOLUBLE PRODUCT OF REACTION OF (1) DICYANDIAMIDE WITH (2) THE PRODUCT OF REACTION, UNDER ACID CONDITIONS, OF FORMALDEHYDE AND AN AMINE SELECTED FROM THE CLASS CONSISTING OF PRIMARY AROMATIC MONOAMINES AND SECONDARY MONOAMINES HAVING AT LEAST ONE MONOVALENT AROMATIC RADICAL ATTACHED TO THE AMINE NITROGEN ATOM, THE FORMALDEHYDE AND THE AMINE BEING EMPLOYED IN THE RATIO OF FROM ABOUT 0.5 TO ABOUT 1.5 MOLS OF FORMALDEHYDE PER MOL OF THE AMINE, AND THE DICYANDIAMIDE OF (1) BEING EM PLOYED IN AN AMOUNT CORRESPONDING TO AT LEAST ABOUT 0.9 MOL THEREOF PER MOL FO THE AMINE USED IN FORMING THE REACTION PRODUCT OF (2) AND THEN HEATING SAID PAPER AT A TEMPERATURE OF AT LEAST 230*-260* F. FOR ABOUT 1-2 MINUTES TO CURE SAID RESIN.

Claim 2

A METHOD OF PRODUCING WET STRENGTH PAPER WHICH COMPRISES APPLYING TO THE FIBERS THEREOF ABOUT 0.1% TO 5% OF A RESINOUS COMPOSITION COMPRISING A UREA-FORMALDEHYDE RESIN HAVING INTERCONDENSED THEREIN A WATER-SOLUBLE PRODUCT OF REACTION OF (1) DICYANDIAMIDE WITH (2) THE PRODUCT OF REACTION, UNDER ACID CONDITIONS, OF FORMALDEHYDE AND AN AMINE SELECTED FROM THE CLASS CONSISTING OF PRIMARY AROMATIC MONOAMINES AND SECONDARY MONOAMINES HAVING AT LEAST ONE MONOVALENT AROMATIC RADICAL ATTACHED TO THE AMINE NITROGEN ATOM, THE FORMALDEHYDE AND THE AMINE BEING EMPLOYED IN THE RATIO OF FROM ABOUT 0.5 TO ABOUT 1.5 MOLS OF FORMALDEHYDE PER MOL OF THE AMINE, AND THE DICYANDIAMIDE OF (1) BEING EM PLOYED IN AN AMOUNT CORRESPONDING TO AT LEAST ABOUT 0.9 MOL THEREOF PER MOL FO THE AMINE USED IN FORMING THE REACTION PRODUCT OF (2) AND THEN HEATING SAID PAPER AT A TEMPERATURE OF AT LEAST 230*-260* F. FOR ABOUT 1-2 MINUTES TO CURE SAID RESIN.