Blends of thermoplastic polymers, electrostatic dissipative polymers and electrostatic dissipative enhancers

A blend having electrostatic dissipative properties comprising from about 50 to about 90% by weight of a thermoplastic base polymer;

• from about 5 to about 50% by weight of an electrostatic dissipative agent;
• and from about 0.1 to about 20% by weight of an acrylic electrostatic dissipative enhancer, wherein the electrostatic dissipative agent comprises a low molecular weight polyether oligomer reacted with a chain extender diol and a diisocyanate;
• wherein the acrylic electrostatic dissipative enhancer comprises a graft copolymer of methyl methacrylate, wherein said graft copolymer contains polymerized therein any one or more alkyl acrylates and methyl methacrylate in a total amount of at least 60% by weight based upon the total weight of said graft copolymer, and wherein said methyl methacrylate is at least 20% by weight based upon the total weight of said graft copolymer;
• wherein the blend has a surface resistivity less than about 2.9×1012 ohms/sq. and a volume resistivity less than about 1.4×1013 ohms-cm when measured in accordance with ASTM Standard D-257;
• and wherein the thermoplastic base polymer comprises a polyurethane, polyester, polyamide, homopolymer or copolymer of polyvinyl chloride, chlorinated polyvinyl chloride, copolymer of styrene and acrylonitrile, polystyrene, polyolefin, or mixtures thereof.