PolyOne, Avon Lake, Ohio, is expanding its intellectual portfolio of electrically conductive compounds with a new technology for incorporating carbon nanotubes in polycarbonate.
A patent application published yesterday discloses a technology covering single- and multi-wall nanotubes that constitute from about 0.1 to about 10 percent by weight of the compound. The claim covers use of additional additives or plastics, including ABS, PBT, PLA, impact modifiers, flame retardants, carbon fibers and glass fibers.
The carbon nanotubes described in the patent application have an aspect ratio ranging from 10:1 to 10,000:1 and a diameter ranging from about 0.5 nm to about 1000 nm.
The patent application states: “The present invention has found that carbon nanotubes can be the only type of electrically conductive particle dispersed in the polycarbonate in order to minimize the effect on mechanical properties on polycarbonate than if other conductive fillers, such as carbon black and metallic fillers, were used.”
PolyOne sells a broad range of conductive compounds under the brand umbrella Therma-Tech. One example is Stat-Tech PC-CB2/000 CR PC with carbon nano filler.
In a recent press release, PolyOne described how Akboru Elektrik, a Turkish supplier of lighting systems for pools, hot tubs and gardens, is using Therma-Tech thermally conductive polymers to replace aluminum for heat sinks in LED swimming pool lighting. The expected useful lifetime of the lights is said to be increased by 200 percent while part weight is reduced.