Flame retardant and flame retardant uses
OwnerRobert Valentine Kasowskiinventor
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Abstract
The flame-retardants of this invention were formed by the direct reaction of ethyleneamines and commercial polyphosphoric acid at an elevated temperature. It was unexpected that a high temperature had to be used to overcome reaction barrier to formation. These compounds are found to be efficient flame retardants.
Claims12
A method for preparing sodium free ethyleneamine polyphosphate (EAPPA), the method comprising the step of reacting an ethyleneamine (EA) and polyphosphoric acid (PPA) without water or other solvent at a EA/PPA reaction ratio and at a reaction temperature so that the reaction of EA and PPA goes to completion, and wherein the EA/PPA ratio is operative such that the pH of a 10% aqueous solution by weight of the resulting EAPPA is in the range 2 to 7.5.
Dependencies are inferred from the claim text.