CONDUCTIVITY CONTROL AGENT FOR CATIONIC ELECTRODEPOSITION COATING MATERIAL AND METHOD OF REGULATING ELECTRIC CONDUCTIVITY OF CATIONIC ELECTRODEPOSITION COATING MATERIAL USING THE SAME

摘要

A technology that prevents any deterioration of conductivity and throwing power in a cationic electrodeposition coating material composition of low solid and low ash contents. For example, there is provided a conductivity control agent for cationic electrodeposition coating material for use in a cationic electrodeposition coating material of solid content as low as 0.5 to 9.0 wt.%, comprising an aminated compound of 500 to 20,000 molecular weight and 200 to 500 mmol/100g amine value so as to attain a regulation of electric conductivity to 900 to 2000 μS/cm. Further, there is provided a method of regulating the electric conductivity of cationic electrodeposition coating material, comprising the steps of mixing a conductivity control agent with a cationic electrodeposition coating material of solid content as low as 0.5 to 9.0 wt.%; and regulating the electric conductivity of the cationic electrodeposition coating material of low solid content after the mixing step to 900 to 2000 μS/cm, wherein the conductivity control agent contains an aminated compound of 200 to 500 mmol/100g amine value.