Polymer fire retardant

Claim 1

A fire retardant formulation for synthetic polymeric materials comprising a solid composition precipitated from an aqueous mixture of a water-soluble phosphate or sulfate oxyacid selected from the group consisting of phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sulfuric acid, ammonium hydrogen sulfate, or a mixture of these substances, a water-soluable amine selected from the group consisting of ethylenediamine,p-phenylenediamine, m-xylene-α, α'-diamine, 2,4,6-triamino-1,3,5-triazine, 2-aminopyridine, diethylenetriamine, and urea, or a mixture of these amines, and a water-soluble surfactant selected from the group consisting of sodium lauryl sulfate, polyvidone, sodium alkylbenzenesulfonate and sodium palmitate, or mixtures of these surfactants.

Claim 7

A method of preparing a fire retardant additive for synthetic polymeric materials comprising preparing a solid composition precipitated from a mixture of three reagents each selected respectively from the group consisting of: (a) about 30% to 70% of the total weight of the mixture of one of the following oxyacids: phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen sulfate, or a mixture of these oxyacids; (b) about 30% to 70% of the total weight of the mixture of one of the following amines: ethylenediamine, p-phenylenediamine, m-xylene-α, α', -diamine, 2,4,6-triamino-1,3,5-triazine, 2-aminopyridine, diethylenetriamine, and urea, or a mixture of these amines; and (c) about 0.245% to 10% of the total weight of the mixture of one of the following surfactants: sodium lauryl sulfate, polyvidone, alkylbenzenesulfonate, sodium palmitate or a mixture of these surfactants; which method comprises dissolving the oxyacid in a minimum volume of boiling water, adding the amine and surfactant to the boiling water and oxyacid, heating and stirring the boiling mixture until the solid composition has completely precipitated, filtering the composition from the mixture, and grinding the composition into the fire retardant additive.

Claim 8

A method of preparing a fire retardant additive for synthetic polymeric materials comprising preparing a solid composition precipitated from a mixture of three reagents each selected respectively from the group consisting of: (a) about 30% to 70% of the total weight of the mixture of one of the following oxyacids: phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen sulfate, or a mixture of these oxyacids; (b) about 30% to 70% of the total weight of the mixture of one of the following amines: ethylenediamine, p-phenylenediamine, m-xylene-α, α', -diamine, 2,4,6-triamino-1,3,5-triazine, 2-aminopyridine, diethylenetriamine, and urea, or a mixture of these amines; and (c) about 0.245% to 10% of the total weight of the mixture of one of the following surfactants: sodium lauryl sulfate, polyvidone, alkylbenzenesulfonate, sodium palmitate or a mixture of these surfactants; which method comprises dissolving the oxyacid in a minimum volume of boiling water, adding the amine and surfactant to the boiling water and oxyacid, heating and stirring the boiling mixture until the solid composition has completely precipitated, filtering the composition from the mixture, and grinding the composition into the fire retardant additive.