PROBLEM TO BE SOLVED: To provide: a composite particle containing a polymer particle, high in hydrophilic property and excellent in uniform dispersibility in an aqueous mixture such as an aqueous coating agent, high in stability and having excellent tactile (elasticity) a manufacturing method therefor and an application thereof.SOLUTION: A composite particle contains a polymer particle consisting of a crosslinkable oligomer having a plurality of radical polymerizable groups and a crosslinked (meth)acrylic acid ester resin derived from a (meth)acrylic acid ester-based mono-functional monomer, and a hydrophilic inorganic particle adhered to a surface of the polymer particle and having average primary particle diameter of 10 to 1000 nm, the crosslinkable oligomer is manufactured by reacting (a) polymer, (b) polyisocyanate, and (c) (meth)acrylic acid ester having a hydroxyl group, and hydrophobicity index of the composite particle is 0 to 10.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】重合体粒子を含む複合粒子であって、親水性が高く水性コーティング剤等の水性混合液中での均一分散性に優れ、復元性が高く優れた触感(弾性)を有する複合粒子及びその製造方法並びにその用途を提供する。【解決手段】複合粒子は、複数のラジカル重合性基を有する架橋性オリゴマー及び(メタ)アクリル酸エステル系単官能単量体に由来する架橋(メタ)アクリル酸エステル系樹脂からなる重合体粒子と、該重合体粒子の表面に付着した平均一次粒子径が10~1000nmの親水性無機粒子とを含む複合粒子であって、前記架橋性オリゴマーが、(a)ポリオールと、(b)ポリイソシアネートと、(c)ヒドロキシ基を有する(メタ)アクリル酸エステルとを反応させてなり、前記複合粒子の疎水性指数が0~10である。【選択図】図1
