Process of preparing thermosetting resins from urea, an aldehyde and aminoaliphatic carboxyl compounds and derivatives thereof

Claim 1

A PROCESS OF PREPARING A NITROGEN-CONTAINING THERMOSETTING RESIN WHICH COMPRISES REACTING 1 MOLECULAR PRPORTION OF UREA WITH FROM 2 TO 4 MOLECULAR PROPORTIONS OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND A COMPOUND CAPABLE OF YIELDING FROMALDEHYDE ON HEATING IN AN AQUEOUS SOLUTION, IN AN ALKALINE AQUEOUS SOLUTION TO FORM A METHYLOLATED UREA; ADDING TO THE RESULTING SOLUTION FROM 0.05 TO 0.5 MOLECULAR PROPORTION OF AN AMINO ALIPHATIC COMPOUND CONTAINING FROM 2 TO 6 CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF MONOAMINO ALKANOIC ACIDS, MONO-AMINO ALKANDIOIC ACIDS, WATER-SOLUBLE SALTS THEREOF AND ADDITION COMPOUNDS OF SAID ACIDS AND SALTS WITH FORMALDEHYDE; CONCENTRATING THE RESULTING SOLUTION TO A SOLIDS CONTENT OF 55 OT 65% BY WEIGHT WITHOUT MATERIALLY CHANGING THE DEGREE OF POLYMERIZATION OF SAID METHYLOLATED UREA; ACIDIFYING THE RESULTING SOLUTION; ALLOWING THE METHYLOLATED UREA AND SAID AMINO ALIPHATIC COMPONENT TO REACT AND CONDENSE UNTIL THE VISCOSITY OF THE SOLUTION AT 60% BY WEIGHT OF RESIN SOLIDS IS BETWEEN ABOUT 5 AND 10 POISES AS MEASURED BY THE GARDNERHOLDT BUBBLE VISCOMETER; AND THEN MAKING THE SOLUTION ALKALINE WITH A WATER-SOLUBLE BASE.