Alkali resistant alkylene polyamine modified phenol-formaldehyde resin

Claim 1

AQUEOUS SOLUTION OF A HEAT-CONVERTIBLE STABLE LIQUID RESIN CAPABLE OF BEING DEHYDRATED TO A NON-GELLED, GLYCOL-MONOETHER SOLUBLE, FUSIBLE PRODUCT ADAPTED FOR IMPREGNATING PAPER, TEXTILE AND ASBESTOS SHEETS, SAID RESIN CONSISTING OF THE WATER-SOLUBLE REACTION PRODUCT OF (1) AN UNDEHYDRATED METHYLOL CONTAINING CONDENSATION PRODUCT OF ONE MOL OF PHENOL PER SE AND BETWEEN ONE AND THREE MOLS OF FORMALDEHYDE AND (2) AN ALKYLENE POLYAMINE HAVING AT LEAST TWO NITROGEN ATOMS AND AT LEAST THREE REPLACEABLE HYDROGEN ATOMS ATTACHED TO SAID NITROGEN ATOMS, SAID POLYAMINE BEING IN PROPORTIONS BETWEEN 1/F MOL AND ONE MOL PER MOL OF PHENOL WHERE F IS AN INTEGER EQUIVALENT TO THE SUM OF SAID REPLACEABLE HYDROGEN ATOMS, THE REACTION OF PRODUCT HAVING BEEN OBTAINED BY REACTING THE METHYLOL CONDENSATE AND THE POLYAMINES IN THE PRESENCE OF LESS THAN ONE MOL FREE FORMALDEHYDE PER MOL OF POLYAMINE, AND WITH A TOTAL AMOUNT OF FORMALDEHYDE ABOVE EQUIMOLAR PROPORTIONS WITH SAID PHENOL NOT IN EXCESS OF TWO MOLS PER MOL OF THE POLYAMINE.