White conductive primer coating composition and method of forming multilayered coating film

A white conductive primer coating composition comprising:

• (a) 100 parts by total weight of a chlorinated polyolefin resin with a chlorine content of 10 to 40 wt. %, and at least one modifier resin selected from the group consisting of acrylic resins, polyester resins and polyurethane resins;
• (b) 5 to 50 parts by weight of a crosslinking agent;
• and
• (c) 10 to 200 parts by weight of a white conductive powder comprising white inorganic pigment particles having on their surfaces a tin dioxide covering layer containing tungsten;
• in the white conductive powder (c), the proportion of the tungsten-containing tin dioxide covering layer is 3 to 150 wt. % on a tin dioxide basis, relative to the weight of white inorganic pigment;
• the composition being capable of forming a coating with a lightness (L* value) of 80 or more as determined according to the L*a*b* color system defined in JIS Z 8729, by being applied to a plastic substrate and cured by heating;
• and
• the composition, when formed into an uncured or cured coating applied on a plastic substrate, having a surface electrical resistance of less than 109 Ω/sq.