Flame-resistant polycarbonate molding compositions

Claim 2

A molding composition having an oxygen index of greater than 0.30 according to ASTM D-2863/70 comprising an aromatic polycarbonate containing 0.5 to 20 percent by weight of an aromatic polyamide fiber which is stable in a melt of the polycarbonate.

Claim 3

The molding composition of claim 1 wherein the aromatic polyamide has a relative solution viscosity of at least 2 measured on a 1% strength solution of the polyamide in dimethyl acetamide at 25°C and is the reaction product of: a. 0-40 mol percent of 2,4-diaminodiphenylether, b. 50-10 mol percent of a halogenated 2,4-diaminodiphenylether of the general formula: ##SPC8## in which X is a halogen n = 1 or 2, c. 10-50 mol percent of unsubstituted isophthalic acid and d. 40-0 mol percent of unsubstituted terephthalic acid.

Claim 4

The molding composition of claim 1 wherein the aromatic polycarbonate has a molecular weight of between about 10,000 and 100,000 and wherein the organic fiber is a fiber of an organic polymer having a molecular weight of greater than about 20,000 and wherein the organic fiber has a length of between about 500 and 50,000 μ.

Claim 5

The molding composition of claim 1 wherein the aromatic polycarbonate contains from about 1 to 5% by weight of the fiber.

Claim 6

The molding composition of claim 1 wherein said aromatic polycarbonate is derived from an aromatic dihydroxydiarylalkane.

Claim 7

The molding composition of claim 1 wherein said aromatic dihydroxydiarylalkane is selected from the group consisting of bis-(4-hydroxy-phenyl)-propane-2,2; bis-(4-hydroxy-3,5-dichlorophenyl)-propane-2,2; bis-(4-hydroxy-3,5-dibromophenyl) propane-2,2 and bis-(4-hydroxy-3,5-dimethylphenyl)-propane.

Claim 8

The molding composition of claim 1 wherein the aromatic polyamide consists of recurring structural units of the general formula: ##SPC9## in which X is the ##EQU2## R 1 and R 2 independently of one another are hydrogen, alkoxy or alkyl groups with 1-4 C atoms, or halogen atoms, R 3 is hydrogen, halogen, an alkyl or alkoxy group with 1-4 C atoms, a nitrile group or a --COOR 4 or --CONR 5 R 6 group, Ar is a divalent aromatic radical, R 4 denotes hydrogen or an alkyl group with 1-4 C atoms and R 5 and R 6 independently of one another denote hydrogen, alkyl groups with 1-4 C atoms or aryl groups.