Flame retardant copolyetherester elastomers

Claim 1

A flame retardant low-modulus copolyetherester composition comprising: (i) a low-modulus copolyetherester resin; (ii) a flame retarding amount of a flame retarding agent selected from the group consisting essentially of (a) an aromatic carbonate copolymer in which from 25 to 75 weight percent of the repeating units comprise chloro- or bromo-substituted dihydric phenol units and the remainder of the repeating units comprise dihydric phenol, glycol or dicarboxylic acid units; (b) an aromatic carbonate polymer derived from dihydric phenols and containing terminal brcmine-substituted aromatic radicals, said polymer being represented by the following formula: wherein n is an integer of 2 - 4, R 1 and R 2 are independently halogen, alkyl or aralkyl, X 1 and X 2 are bromo- or chloro-, p and g are integers of from 0 to 4, and m is an integer of from 2 to about 400; (c) a high-molecular weight brominated epoxy having aromatically bound bromine; and (d) brominated polyphenylene oxides having repeating units of the following structure: wherein X 6 is independently a hydrocarbon radical, a halo-hydrocarbon radical having at least two carbon atoms between the halogen and the phenol nucleus, a hydrocarbonoxy radical, and a halohydrocarbonoxy radical having at least two carbon atoms between the halogen and the phenol nucleus, r is an integer of from 1 to 4, b is an integer of from 0 to 3 provided r + b is less than or equal to 4; (iii) optionally, an effective amount of a flame retardant synergist; and (iv) optionally, a second thermoplastic polymer.