Conductive polyester/polycarbonate blends, methods for preparation thereof, and articles derived therefrom

A conductive thermoplastic composition, comprising, based on the total weight of the composition:

• 15 to 30 weight percent polycarbonate,
• 35 to 45 weight percent polyester;
• 0.01 to 0.04 parts by weight transesterification quencher per 100 parts by weight of polyester;
• 6 to 10 weight percent impact modifier;
• 4 to 6 weight percent conductive carbon black;
• and
• 15 to 30 weight percent glass fibers;
• wherein the composition comprises a first continuous phase comprising polyester, and wherein at least 50% of the conductive filler is disposed in the continuous phase comprising polyester.

A method of preparing a conductive thermoplastic composition, comprising:

• blending 10 to 50 weight percent polycarbonate;
• 20 to 60 weight percent polyester;
• 0.005 to 5 parts by weight transesterification quencher per 100 parts by weight of polyester;
• 1 to 20 weight percent impact modifier;
• and 0.2 to 20 weight percent conductive filler to form a first blend;
• and
• adding 10 to 40 weight percent glass fibers to the first blend total form the conductive thermoplastic composition;
• wherein all weight percentages are based on the weight of the total composition, and wherein the conductive filler is provided to the first blend as a conductive filler concentrate comprising 5 to 30 parts by weight of conductive filler and 70 to 95 parts by weight of polyester.