Transparent, antistatic thermoplastic composition and methods of making the same

Transparent methacrylate-acrylonitrile-butadiene-styrene (MABS) thermoplastic copolymers may be provided with electrostatic dissipative (ESD) properties, while maintaining or enhancing physical properties of the MABS, such as impact strength, by blending the MABS with an inherently antistatic thermoplastic urethane copolymer which is the reaction product of a hydroxy-terminated polyalkylene ether oligimer, a C2-C6 alkanediol and an aromatic diisocyanate, and compatibilizing the blend of MABS and urethane with an acrylonitrile-butadiene-styrene rubbery copolymer produced by emulsion polymerization containing at least 40 weight percent butadiene monomer and a ratio of styrene to acrylonitrile which will produce a rubbery copolymer having a refractive index in the range of about 1.53 to 1.55. All three copolymer components of the transparent blend have refractive indices in the range of about 1.53 to 1.55.