Fire-retardant composition containing an anion exchange resin

Claim 1

A LIQUID FILM-FORMING COMPOSITION CAPABLE OF IMPARTING FIRE RETARDANT PROPERTIES TO COM BUSTIBLE MATERIALS WHEN APPLIED THERETO AND DRIED THEREON, COMPRISING A ROOM TEMPERATURE LIQUID MIXTURE OF INCOMPLETELY POLYMERIZED BASIC-ANIONEXCHANGE-CO-CONDENSATION RESIN-FORMING INGREDIENTS CONSISTING ESSENTIALLY OF A WEAKLY BASIC DERIVATIVE OF CYANAMIDE SELECTED FROM THE GROUP CONSISTING OF UREA, THIOUREA, DICYANIDIAMIDE AND MELAMINE, A STRONGLY BASIC DERIVATIVE OF CYANAMIDE SELECTED FROM THE GROUP CONSISTING OF GUANIDINE AND SUBSTITUTED GUANIDINE AND AN AQUEOUS FORMALDEHYDE SOLUTION WITH THE FORMALDEHYDE BEING IN A PROPORTION OF AT LEAST ABOUT 1 2/3 MOLS OF FORMALDEHYDE TO 1 MOL OF COMBINED CONTENT OF SAID CYANAMIDE DERIVATIVES, AND AT LEAST 2 MILLIEQUIVALENTS PER GRAM SOLIDS OF SAID RESIN-FORMING INGREDIENTS OF A STRONG NON-OXIDIZING INORGANIC ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 10-3, SAID COMPOSITION IN THE FORM OF A DRIED FILM BEING CONVERTED BY HEAT AT ELEVATED TEMPERATURE INTO A HEAT-INSULATING CARBONACEOUS MASS.