ANTICORROSIVE COATING COMPOSITION, COATED FILM FORMED FROM THE COMPOSITION, LAMINATE AND STRUCTURE HAVING THE COATED FILM, AND ADDITIVE AGENT FOR ANTICORROSIVE COATING

PROBLEM TO BE SOLVED: To provide an anticorrosive coating composition which (1) is useful as an organic zinc-rich paint that provides a coated film having a slip factor of 0.45 or more, (2) can keep glossiness of a top coat layer when an undercoat layer, a middle coat layer and the top coat layer are recoated in this order on the coated film, and (3) is excellent in storage stability; a coated film formed from the composition; a laminate and a structure having the coated film; and an additive agent for anticorrosive coating.SOLUTION: An anticorrosive coating composition contains an organic resin, zinc powder having an average particle diameter of 1-30 μm and hollow particles having 90% cumulative average diameter din terms of volume of 60 μm or less, where a pigment volume concentration (PVC) being the volume concentration of the total of the zinc powder and the hollow particles in a nonvolatile component contained in the composition is 58% or more, and an amount of particles having a particle diameter of 10 μm or more contained in the total in the nonvolatile component is 34 vol% or more, or a slip factor of the coated film formed of the composition is 0.45 or more.SELECTED DRAWING: None 【課題】（１）０．４５以上のすべり係数を有する塗膜を与える有機ジンクリッチペイントとして有用であり、（２）当該塗膜上に下塗り層、中塗り層、及び上塗り層をこの順序で塗り重ねた場合、上記上塗り層の光沢度を維持することができ、（３）貯蔵安定性に優れる防食塗料組成物、該組成物からなる塗膜、該塗膜を備える積層体及び構造物、並びに防食塗料用添加剤を提供する。【解決手段】本発明に係る防食塗料組成物は、有機樹脂と、平均粒子径１〜３０μｍの亜鉛末と、体積換算の９０％累積平均径ｄ９０が６０μｍ以下の中空粒子と、を含有し、前記組成物に含まれる不揮発分中、前記亜鉛末及び前記中空粒子の合計の体積濃度である顔料体積濃度（ＰＶＣ）は５８％以上であり、かつ、該不揮発分中、該合計に含まれる粒子径１０μｍ以上の粒子の量が３４体積％以上であり、又は、前記組成物からなる塗膜のすべり係数は０．４５以上である。【選択図】なし