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Phosphonitrilic Additives in Preparation of Fire-Resistant Resins

The objective of this study was the development of PNC12 polymers or their derivatives to impart fire-retardance to four types of resins, namely polyesters, epoxy, polyurethane and phenolic resins. Reaction of PNC12 polymers with the resin matrices was accomplished demonstrating the feasibility of the concept. Linear PNC12 polymer of about 1100 molecular weight has been successfully formulated in polyesters containing an epoxy compound to scavenge HC1 which is formed. At 5 to 15% content of PNC12 a flame-retardant laminate (60% glass, Mil Spec 21607B) is produced with over 2MM psi flexural modulus. Both linear and cyclopolymers are useful in producing resin laminates which are self-extinguishing and of conventional strength. Fire-resistant laminates were prepared successfully using the four types of resins cited above.