Fire retardant coating compositions containing a reaction product of phosphoryl chloride and anhydrous ammonia and articles coated therewith

Claim 1

A POTENTIALLY INTUMESCING FIRE RETARDANT COATING COMPOSITION COMPRISING (1) FROM 15 TO 85% BY WEIGHT OF SOLIDS, SAID SOLIDS COMPRISING FROM 50 TO 90% BY WEIGHT OF (A) A MIXTURE CONTAINING FROM 10 TO 100% BY WEIGHT OF A FILMFORMING CONDENSATION PRODUCT OF 4,4'' DIHYDROXY DIPHENYL DIMETHYL METHANE WITH EPICHLOROHYDRIN AND UP TO 90% BY WEIGHT OF A THERMOSETTING RESIN SELECTED FROM THE GROUP CONSISTING OF (A) HEATCONVERTIBLE PHENOL-FORMALDEHYDE RESINS, (B) HEAT-CONVERTIBLE RESINS OF AN ALDEHYDE AND A COMPOUND SELECTED THE GROUP CONSISTING OF UREA, THIOUREA, GUANIDINE, CYANAMIDE, DICHYANDIAMIDE AND AMINO-TRIAZINES HAVING AT LEAST TWO AMINO GROUPS AND (C) ALKYLATED DERIVATIVES OF THE HEAT-CONVERTIBLE RESINS DEFINED IN (B), AND (B) A WATER-INSOLUBLE REACTION PRODUCT OF PHOSPHORYL CHLORIDE AND ANHYDROUS AMMONIA, SAID LAST NAMED REACTION PRODUCT AND SAID MIXTURE BEING PRESENT IN SAID SOLIDS IN A WEIGHT RATIO OF 1:1 TO 1:5; AND (2) FROM 85 TO 15% BY WEIGHT OF AN ORGANIC VEHICLE WHICH INCLUDES AN ORGANIC SOLVENT FOR SAID FIRST NAMED CONDENSATION PRODUCT AND SAID THERMOSETTING RESIN, SAID REACTION PRODUCT OF PHOSPHORYL CHLORIDE AND ANHYDROUS AMMONIA HAVING A NITROGEN-PHOSPHORUS ATOMIC RATIO WITHIN THE RANGE OF 1,5:1 TO 2.0:1.