Flame retardant polycarbonate resin/ABS graft copolymer blends

A thermoplastic resin composition, comprising:

• (a) an aromatic carbonate resin,
• (b) a rubber modified graft copolymer comprising a discontinuous rubber phase dispersed in a continuous rigid thermoplastic phase, wherein at least a portion of the rigid thermoplastic phase is chemically grafted to the rubber phase and wherein the rigid thermoplastic phase has a glass transition temperature of at least 25° C., and
• (c) a flame retarding amount of an alkali metal or alkaline earth metal salt of a sulfonic diacid having aromatic centers with at least one electron donating group, said compound having the formula:
• where R is independently for each substitution a one to forty carbon atom alkyl, aralkyl or aromatic group, M is a metal selected from the group of alkali metals and alkaline earth metals with x the oxidation state of the metal, M, where i, j, k and m are each integers ranging from 0 to 5 subject to the limitation that i+k is at least 1 and subject to the further limitation that i+j is less than or equal to 5 and k+m is less than or equal to 5.

A thermoplastic resin composition, comprising the composition resulting from blending:

• (a) a polycarbonate resin,
• (b) a rubber modified graft copolymer comprising a discontinuous rubber phase dispersed in a continuous rigid thermoplastic phase, wherein at least a portion of the rigid thermoplastic phase is chemically grafted to the rubber phase, and wherein the rigid thermoplastic phase has a glass transition temperature of at least 25° C., and
• (c) a flame retarding amount of an alkali metal or alkaline earth metal salt of a sulfonic diacid having aromatic centers with at least one electron donating group, said compound having the formula:
• where R is independently for each substitution a one to forty carbon atom alkyl, aralkyl or aromatic group, M is a metal selected from the group of alkali metals and alkaline earth metals with x the oxidation state of the metal, M, where i, j, k and m are each integers ranging from 0 to 5 subject to the limitation that i+k is at least 1 and subject to the further limitation that i+j is less than or equal to 5 and k+m is less than or equal to 5.