PURPOSE: To improve chipping resistance, by a method wherein a film having a specific composition, whose static glass transition temp. is -100-0°C, is provided between the surface to be coated of a metal and an electrodeposition film and, if necessary, an intermediate coat film and a top coat film are formed on the electrodeposition film.
CONSTITUTION: An insocyanate modified polybutadiene resin A containing two or more free isocyanate groups on an average in one molecule thereof and having a number average MW of 500-20,000, a polyol component B containing two or more hydroxy groups on an average in one molecule thereof and having a number average MW of 150-50,000 and a conductive filler are used as main components to prepare a composition. This composition is applied to the surface to be coated of a metal to provide a film having static glass transition temp. of -100-0°C and an electrodeposition film is further formed on said film. If necessary, an intermediate coat film and/or a top coat film can be formed on the electrodeposition film.
IWASE OSAMU
NEZU TSUGUO
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