Structure with blended polymer conformal coating of controlled electrical resistivity

摘要

A conformally coated structure includes a component of an electronic assembly (20), such as a microelectronic device (24), a part of a package (32), or an electrically conductive trace (38), and a conformal coating (40) applied to a surface of the structure. The conformal coating (40) is a cured polymer blend of a base polymer and an electrically conductive polymer. The polymer blend has an electrical resistivity of from about 10<9> to about 10<13> ohm-centimeter. The polymer blend contains from about 0.5 percent to about 4 percent by weight of the electrically conductive polymer, with the remainder comprising the base polymer. The electrically conductive polymer may be a polyaniline, and the base polymer may be a urethane (Fig. 1).