Abstract: 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 resin (A) is 15 to 60%, the content of resin (B) is 10 to 50%, the content of resin (C) is 20 to 50%, and the content of emulsion (D) is 5 to 20%, all by weight on the solid equivalent basis in 100% by weight of the total amount of resin (A), resin (B), resin (C) and emulsion (D), and resin (A) is a polypropylene resin having crystallinity of 35 to 55% and a weight average molecular weight of 50000 to 200000. The composition can achieve an adhesion property to a substrate, gasohol resistance, inhibition of peeling of a multilayer coating film in washing by high pressure cleaning and moisture resistance.

Abstract: A method for forming a bright coating film includes: (1) applying a water-based primer coating material composition to a substrate to form a water-based primer coating film; (2) applying a water-based bright coating material (i) to the water-based primer coating film to form a first base coating film; (3) applying a water-based bright coating material (ii) to the first base coating film to form a second base coating film; (4) applying a high-solid clear coating material to the second base coating film to form a clear coating film; and (5) heat-curing the water-based primer coating film, the first base coating film, the second base coating film, and the clear coating film simultaneously to form a cured coating film, wherein the water-based primer coating material composition includes a water-based non-chlorinated polyolefin resin (A), a water-based polyurethane resin (B), a water-based epoxy resin (C), and an internally crosslinked acrylic particle emulsion (D), and an emulsifier.

Abstract: 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.

Abstract: The present invention provides: an aqueous primer coating composition, which can form a coating film excellent in the humidity-resisting adhesion and the gasohol resistance, and which can enhance the productivity in the coating steps; a process for formation of a coating film using this composition; and a coated article. The aqueous primer coating composition comprises an acid-anhydride-modified chlorinated polyolefin emulsion resin (A), an aqueous urethane dispersion (B), an aqueous epoxy resin (C), and an organic strong base and/or its salt (D); wherein: relative to the total nonvolatile content of the (A), (B), and (C), the nonvolatile content of the (A) is in the range of 20 to 60 weight %, that of the (B) is in the range of 10 to 40 weight %, and that of the (C) is in the range of 20 to 60 weight %, and further, the (D) is in the range of 1 to 5 weight %.

Abstract: The present invention provides: an aqueous primer coating composition, which can form a coating film excellent in the humidity-resisting adhesion and the gasohol resistance, and which can enhance the productivity in the coating steps; a process for formation of a coating film using this composition; and a coated article. The aqueous primer coating composition comprises an acid-anhydride-modified chlorinated polyolefin emulsion resin (A), an aqueous urethane dispersion (B), an aqueous epoxy resin (C), and an organic strong base and/or its salt (D); wherein: relative to the total nonvolatile content of the (A), (B), and (C), the nonvolatile content of the (A) is in the range of 20 to 60 weight %, that of the (B) is in the range of 10 to 40 weight %, and that of the (C) is in the range of 20 to 60 weight %, and further, the (D) is in the range of 1 to 5 weight %.