Polyamine modified melamine-formaldehyde resins

Claim 1

THE PROCESS OF PREPARING A WATER-SOLUBLE RESINOUS MATERIAL COMPRISING THE REACTION PRODUCT OF MELAMINE, FORMALDEHYDE AND A POLYFUNCTIONAL ALIPAHTIC POLYAMINE WHEREIN THE FORMALDEHYDE IS PRESENT IN A TOTAL AMOUNT OF AT LEAST 8 MOLS PER MOL OF MELAMINE WHICH COMPRISES TREATING A PARTIALLY POLYMERIZED MELAMINE-FORMALDEHYDE CONDENSATION PRODUCT HAVING A MELAMINE TO FORMALDEHYDE MOL RATIO OF FROM ABOUT 1:1.5 TO 1:5, RESPECTIVELY, AT A TEMPERTURE BETWEEN ABOUT 20* C. AND 100* C. WITH A POLYFUNCTIONAL ALIPHATIC POLYAMINE PROVIDING A CARBON TO NITROGEN PER MOL OF MELAMINE; INTRODUCING FORMALDEHYDE AMOUNT SUFFICIENT TO YIELD BETWEEN ABOUT 0.5-10 ATOMS OF NITROGEN PER MOL OF MELAMINE; INTRODUCING FORMALDEHYDE UNTIL THE MOL RATIO OF MELAMINE TO FORMALDEHYDE LIES WITHIN THE RANGE OF FROM 1:6 TO 1:15, RESPECTIVELY; RE ACTING THE MIXTURE UNTIL AN END POINT VISCOSITY OF BETWEEN ABOUT 20 CENTIPOISES AND 800 CENTIPOSES MEASURED AT 35% SOLIDS AND 25* C. IS OBTAINED; INHIBITING FURTHER REACTION BY SUBSTANTIALLY NEUTRALIZING THE POLYMERIZED PRODUCT AND ADDING TO THE REACTION PRODUCT ADDITIONAL FORMALDEHYDE IN AN AMOUNT SUFFICIENT TO BRING THE MOL RATIO OF THE MELAMINE TO TOTAL FORMALDEHYDE CHARGED TO AT LEAST 1:8, RESPECTIVELY.