Thermosetting resins and process of preparing same

Claim 1

A PROCESS OF PREPARING NITROGEN-CONTAINING THERMOSETTING RESINS WHICH COMPRISES REACTING 1 MOLECULAR PROPORITONS OF AN AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF UREA, THIOUREA, CYANAMIDE, DICYANDIAMIDE, GUANIDINE AND AMINOTRIAZINES HAVING AT LEAST TWO PRIMARY AMINO GROUPS AND MIXTURES, THEREOF WITH FROM 0.5 TO 2 MOLECULAR PROPORTIONS, BASED ON EACH AMINO GROUP OF SAID AMINO COMPOUND, OF AN ALDEHYDE IN AN AQUEOUS SOLUTION HAVING A PH BETWEEN ABOUT 7 AND 10 TO FORM A CONDENSATE OF SAID AMINO COMPOUND AND SAID ALDEHYDE, ADDING TO THE RESULTING SOLUTION FROM ABOUT 0.05 TO 0.5 MOLECULAR PROPORTION OF A WATER-SOLUBLE SALT OF NUCLEAR SUBSTITUTED HYDROXY AROMATIC SULFONIC ACID CONTAINING FROM 6 TO 10 CARBON ATOMS AND HAVING ONE HYDROXYL GROUP AND 1 TO 2 SULFONIC ACID GROUPS, IN WHICH ACID THE HYDROXYL AND SULFONIC ACID GROUPS ARE THE SOLE SUBSTITUENTS OTHER THAN HYDROGEN, ADJUSTING THE PH OF THE RESULTING SOLUTION BETWEEN 4 AND 10 AND HEATING THE SOLUTION UNTIL THE CONDENSATE IN THE SOLUTION IS WATERSOLUBLE AND IS CAPABLE OF INCREASING THE WET TENSILE STRENGTH OF PAPER FORMED FROM CELLULOSE FIBERS TREATED WITH SAID CONDENSATE IN THE PRESENCE OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM SULFATE AND MINERAL ACIDS.