Method of forming sized paper containing an epihalohydrin prepolymer and paper thereof

Claim 1

A SIZED CELLULOSIC PAPER COMPRISING CELLULOSE-CONTAINING PAPER IMPREGNATED WITH A MINOR AMOUNT SUFFICIENT TO GIVE SIZING OF A PREPOLYMER WHICH IS THE REACTION PRODUCT OF (A) AN ESSENTIALLY MONOMERIC ADDUCT OF AT LEAST MOLAR PORPORTIONS OF AN EPIHALOHYDRIN PER MOLAR PROPORTON OF AN AMINE HAVING AT LEAST 1 PRIMARY AMINO NITROGEN AND FROM 2 TO 8 AMINO HYDROGENS, AND (B) AN AMINE HAVING AT LEAST 2 AMINO HYDROGENS, SAID ADDUCT (A) HAVING AT LEAST 2 HALOALKANOL GROUPS PER MOLE OF AMINE, AT LEAST ONE OF SAID ADDUCT (A) AND SAID AMINE (B) HAVING AT LEAST 23 REACTIVE GROUPS, THE MOLAR PROPORTIONS OF SAID ADDUCT (A) TO SAID AMINE (B) BEING SUCH THAT THE ADDUCT (A) PROVIDES AT LEAST 3 HALOALKANOL EQUIVALENTS AND THE ADDUCT (A) AND AMINE (B) PROVIDE AT LEAST 3 AMINO HYDROGENS FOR EACH COMBINED TOTAL OF FROM 6 TO 14 HALOALKANOL AND AMINO HYDROGEN EQUIVALENTS, AT LEAST ONE OF SAID ADDUCT (A) AND AMINE (B) REACTANTS CONTAINING A GROUP SELECTED FROM THE CLASS CONSISTING OF ALKYL AND ALKENYL RADICALS HAVING AT LEAST 10 CARBON ATOMS SAID PREPOLYMER BEING CHARACTERIZED BY THE FACT THAT WHEN SAID PREPOLYMER IS CONTACTED WITH AN AQUEOUS MEDIUM HAVING A PH GREATER THAN 5 SAID PREPOLYMER IS CONVERTED TO AN INSOLUBLE CROSS-LINKED POLYMER.