COATING COMPOSITION, HARD COATING FILM, AND SUBSTRATE WITH HARD COATING FILM

To provide a coating composition and the like that have excellent storage stability, abrasion resistance, durability, and coating properties.SOLUTION: A coating composition comprises polymeric nanoparticles (A) and a matrix raw material component (B'), wherein an elastic recovery modulus ηITA of the polymeric nanoparticles (A), measured by an indentation test in accordance with ISO 14577-1, is 0.30 or more and 0.90 or less; Martens hardness HMA of the polymeric nanoparticles (A) and the Martens hardness HMB' of the matrix raw material component (B') satisfy the relationship of HMB'/HMA>1; the matrix raw material component (B') contains a hydrolyzable silicon compound (b); and a silicon content of the hydrolyzable silicon compound (b) is 1.80 mass% or more and 5.00 mass% or less of the total coating composition.SELECTED DRAWING: None 【課題】貯蔵安定性、耐摩耗性、耐久性及び塗装性に優れる塗料組成物等を提供する。【解決手段】重合体ナノ粒子（Ａ）と、マトリクス原料成分（Ｂ'）と、を含む塗料組成物であって、ＩＳＯ１４５７７－１に準拠し、インデンテーション試験から測定される、前記重合体ナノ粒子（Ａ）の弾性回復率ηITAが、０．３０以上０．９０以下であり、前記重合体ナノ粒子（Ａ）のマルテンス硬度ＨＭAと、前記マトリクス原料成分（Ｂ'）のマルテンス硬度ＨＭB'とが、ＨＭB'／ＨＭA＞１の関係を満たし、前記マトリクス原料成分（Ｂ'）が加水分解性珪素化合物（ｂ）を含み、加水分解性珪素化合物（ｂ）の珪素含有量が、前記塗料組成物全体の１．８０質量％以上５．００質量％以下である、塗料組成物。【選択図】なし