Crater inhibiting method and crater inhibiting agent for cationic electrodeposition coating composition

摘要

The present invention provides a novel crater inhibiting method and crater inhibiting agent not containing an acrylic resin and hence capable of increasing the opportunities to be added to coating compositions and improving degree of freedom in preparation methods of coating composition. The method comprises that electrodeposition coating is conducted by using an electrodeposition coating composition containing an aminopolyether modified epoxy having a polyether chain of specific structure as an additive.