Flame retardant adduct of cyclophosphonitrilic chloride and hexamethylphosphoramide
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsRobert M. Murch, Eldon E. Stahly
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Abstract
The adduct of hexamethylphosphoramide and a cyclophosphonitrilic chloride, PNCl.sub.2).sub.n.sup.. [(CH.sub.3).sub.2 N].sub.3 PO, useful for enhancing the fire retardancy of epoxy resins and a method for enhancing the fire retardancy of epoxy resins through the combination therewith.
Claims6
An epoxy resin having enhanced fire retardancy properties which comprises an epoxy resin and an additive selected from the class consisting of (PNCl.sub.2).sub.3.[(CH.sub.3).sub.2 N].sub.3 PO, (PNCl.sub.2).sub.3.[(CH.sub.3).sub.2 N].sub.3 PO, and mixtures thereof in a flame retardant amount.
A method for enhancing the fire retardancy characteristics of epoxy resins which comprise admixing an additive selected from the class consisting of (PNCl.sub.2).sub.3.[(CH.sub.3).sub.2 N].sub.3 PO, (PNCl.sub.2).sub.3.[(CH.sub.3).sub.2 N].sub.3 PO, and mixtures thereof in an amount from about 1 to about 30 mole percent of the combined weight with an uncured epoxy resin and curing said epoxy resin.
A method for enhancing the fire retardancy characteristic of epoxy resins which comprises admixing in a 1:1 mole ratio hexamethylphosphoramide and a cyclophosphonitrilic chloride selected from the class consisting of hexachlorocyclotriphosphonitrile, octachlorocyclotetraphosphonitrile, and mixtures thereof with an uncured epoxy resin;
- and curing said epoxy resin.
Dependencies are inferred from the claim text.