Flame retardant copolyester compositions

A copolyester composition comprising:

• (a) from about 50 to about 95 weight % of a copolyester, the copolyester comprising:
• (i) a diacid component comprising
• from 70 to 100 mole % residues of terephthalic acid,
• from 0 to 30 mole % residues of a modifying aromatic diacid having from 8 to 12 carbon atoms, and
• from 0 to 10 mole % residues of an aliphatic dicarboxylic acid;
• and
• (ii) a glycol component comprising
• from 45 to 95 mole % cyclohexanedimethanol (CHDM) residues,
• from 5 to 65 mole % 2,2,4,4-tetramethylcyclobutane-1,3-diol (TMCD) residues, and from 0 to 10 mole % of a modifying glycol having 2 to 20 carbon atoms;
• wherein the inherent viscosity of the copolyester is from 0.5 to 1.2 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at 25° C., and wherein the weight % is based on the weight of the copolyester, wherein the total mole % of the dicarboxylic acid component is 100 mole % and the total mole % of the glycol component is 100 mole %;
• and
• (b) from about 8 to about 20 weight % of a flame retardant additive comprising a metal phosphinate compound;
• and
• (c) from about 3 to about 10 weight % of an impact modifier component that comprises an acrylic silicone polymer impact modifier;
• wherein the copolyester composition has a UL 94 V-0 rating or better;
• and
• wherein the copolyester composition has a notched Izod impact strength of 80 Joules/m or greater, measured according to ASTM D256.