Poly(parabanic acid) films having improved flammability resistance by the addition of copper chelates and organo halides
AssigneeExxon Research & Engineering Co.
InventorBurnett H. Johnson
Life of this patent
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Abstract
Thin films of about 1 to 5 mil thick of poly(parabanic acid) (PPA-M form) containing halogenated flame retardants have the flame retardancy enhanced by the addition of small amounts (generally about 0.1 to 3.0 weight percent) of a copper chelate compound.
Claims9
A composition of matter comprising about 1 mil to 5 mil thick film of poly[1,4-phenylenemethylene-1,4-phenylene-1,3-(imidazolidine-2,4,5-trione) ] containing therein from about 2 to 10 weight percent of a polybrominated aromatic compound flame retardant which is one of hexabromobiphenyl, octabromodiphenyl ether, octabromobiphenyl or a mixture thereof and an amount of a copper chelate of a 2-hydroxybenzophenone sufficient to enhance the flame retardant properties of said polybrominated aromatic compound in said polymer film.
A method for increasing the flame retardant properties of poly [1,4-phenylenemethylene-1,4-phenylene-1,3-(imidazolidine-2,4,5-trione)] film of from about 1 to 5 mils thick and containing a flame retardant amount of either hexabromobiphenyl, octabromodiphenyl ether, octabromobiphenyl or a mixtures thereof, which method comprises adding from about 0.1 to 3.0 weight % of a copper chelate of a 2-hydroxybenzophenone to said polymer film.
Dependencies are inferred from the claim text.