Patent ID: 8080599

Claim:
A thermoplastic polyester composition comprising, based on the total weight of the composition: from 20 to 95 wt. % of a polyester; from 1 to 35 wt. % of a phosphorous flame retardant comprising: a phosphinate of formula (I) [(R 1 )(R 2 )(PO)—O] − m M m+ (I), a diphosphinate of formula (II) [(O—POR 1 )(R 3 )(POR 2 —O)] 2− n M m+ x (II), and/or a polymer derived from the phosphinate of formula (I) or the diphosphinate of the formula (II), wherein R 1 and R 2 are identical or different and are H, linear or branched C 1 -C 6 alkyl, or C 6 -C 10 aryl; R 3 is C 1 -C 10 , linear or branched alkylene, C 6 -C 10 arylene, C 7 -C 11 alkylarylene, or C 7 -C 11 arylalkylene; M is an alkaline earth metal, alkali metal, Al, Ti, Zn, Fe, or B; m is 1, 2, 3 or 4; n is 1, 2, or 3; and x is 1 or 2; from 0.1 to less than 20 wt. % of a copolyetherester; from 0.1 to 5 wt. % of an anti-dripping agent; from 0 to 4.5 wt. % of a reinforcing fiber; and from 0 to 5 wt. % of an additive selected from the group consisting of a mold release agent, an antioxidant, a thermal stabilizer, a UV stabilizer, and a combination comprising one or more of the foregoing additives; wherein a 0.8 mm thick molded sample comprising the composition has a UL-94 flammability rating of V0 and a 3.2 mm thick molded sample exhibits at least one of the following properties: a tensile elongation at break of at least 4% and a tensile stress at break of at least 15 MPa, as measured in accordance with ASTM D 638, and a flexural modulus of 2,000 to 4,500 MPa, as measured in accordance with ASTM 790, and wherein melamine polyphosphate and epoxy polymer are both not present in the composition.