| 摘要 |
It is an object of the present invention to provide a water-borne primer coating composition using a polyolefin resin not containing chlorine, which can achieve an adhesion property to a substrate and gasohol resistance simultaneously and can achieve the inhibition of peeling of a multilayer coating film in washing a car by high pressure cleaning and moisture resistance simultaneously. A water-borne primer coating composition including a water-borne non-chlorinated polyolefin resin (A), a water-borne polyurethane resin (B), a water-borne epoxy resin (C) and an internally crosslinked acrylic particle emulsion (D), wherein the content of said resin (A) is 15 to 60% by weight, the content of said resin (B) is 10 to 50% by weight, the content of said resin (C) is 20 to 50% by weight, and the content of said emulsion (D) is 5 to 20% by weight on the solid equivalent basis in 100% by weight of the total amount of said resin (A), resin (B), resin (C) and emulsion (D), and said resin (A) is a water-borne polypropylene resin having crystallinity of 35 to 55% and a weight average molecular weight of 50000 to 200000.
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