Phenol-aldehyde-amine anion exchange resin

Claim 1

A WATER INSOLUBLE ANION EXCHANGE RESIN OBTAINED BY REACTING IN AN AQUEOUS MEDIUM A POLYALKYLENE POLYAMINE AND FORMALDEHYDE, WHILE MAINTAINING THE REACTANTS AND PRODUCTS IN LIQUID PHASE, THE FORMALDEHYDE BEING AN EXCESS OVER THAT REQUIRED FOR THE REACTION AND THE QUANTITY OF WATER BEING SUFFICIENT TO DISSOLVE THE RESULATANT CONDENSATION PRODUCT, ADDING PHENOL AND ALLOWING THE INGREDIENTS OF THE RESULTANT REACTION MIXTURE TO REACT SUBSTANTIALLY IN LIQUID PHASE, ACIDIFYING WITH AN AQUEOUS ACID SOLUTION TO A LOW PH APPROXIMATING PH 1 TO 2 AT A RATE SUCH THAT THE TEMPERATURE DOES NOT RISE TO THE TEMPERATURE AT WHICH THE RESULTANT RESIN SOLIDIFIES AND IN A QUANTITY EFFECTIVE TO PRODUCE A CLEAR SOLUTION OF RESULTANT PRODUCT, AND THEN CAUSING THE RESULTANT PRODUCT TO SOLIDIFY, THE PROPORTIONS OF SAID REACTANTS CORRESPONDING TO 0.7 TO 1.7 MOLS OF BASIC NITROGEN ATOMS PER 1.5 TO 3.0 MOLS OF FORMALDEHYDE PER MOL OF PHENOL, SAID PRODUCT WHEN DRIED HAVING A NITROGEN CONTENT WITHIN THE RANGE OF 9 TO 14% NITROGEN CONTACT WITHIN THE RANGE OF 9 TO PER CUBIC FOOT, AND WHICH WHEN 25 ML. THEREOF IS REGENERATED WITH A 4% SODIUM CARBONATE SOLUTION, HEATED ON A STEAM BATH WITH 50 CC. OF 1% HYDROCHLORIC ACID FOR 10 MINUTES, FILTERED AND WASHED WITH 25 ML. OF DISTILLED WATER WILL PRODUCED A TRANSMISSION READING OF AT LEAST 95%.