Patent ID: 8877284

Claim:
A method for making a flexible and clear extruded plastic material article of manufacture having a low surface electric resistance, starting from a flexible and clear extruded plastic material article having a higher surface electric resistance, said method comprising the step of modifying the surface electric conductivity of said flexible and clear extruded plastic material article during the extrusion process by preparing a suspension or a dispersion of carbon nanotubes highly dispersed in a volatile liquid by an ultrasound process; heating at least a portion of said flexible and clear extruded plastic material article to its softening temperature to form a heat softened flexible extruded clear plastic material article; spraying said suspension or dispersion of carbon nanotubes on said at least a portion of said heat softened flexible and clear extruded plastic material article to allow said carbon nanotubes to be partially embedded into said at least a portion of said heat softened flexible and clear extruded plastic material article to firmly anchor to said at least a portion of said heat softened flexible and clear extruded plastic material article to provide surface electrical conductive properties; and cooling the heat softened flexible and clear extruded plastic material article to solidify said flexible and clear extruded plastic material article.