ONE-PART TYPE NORMAL TEMPERATURE CROSSLINKABLE AQUEOUS COATING COMPOSITION

PROBLEM TO BE SOLVED: To provide a one-part type normal temperature crosslinkable aqueous coating composition achieving performance equal to or higher that of a conventional two-part crosslinkable or solvent-based composition and satisfying requirements meeting respective applications when used as a coating composition for various applications such as urethane waterproof materials, metallic materials, wooden materials, ceramic building materials, and plastic materials.SOLUTION: The one-part type composition self-crosslinking at normal temperature includes: a one-part normal temperature crosslinkable polymer emulsion (A) which is prepared by incorporating a hydrazine structure-containing (hydrazine group-containing) polyurethane and a carbonyl group-containing acrylic polymer inside particles dispersed in an aqueous medium and is used as a base component; a polyurethane dispersion (B) wherein particles have both a high Tg ingredient region and a low Tg ingredient region; and an ultrafine particle nanoemulsion (C) having the average particle diameter within the range of 5-140 nm.