COATING LIQUID AND HIGH REFRACTIVE INDEX FILM

To provide a coating liquid for forming a coating film, which allows formation of a high refractive film that is optically transparent and has a re-dissolving property giving easy peelability with a specific solvent.SOLUTION: A coating liquid comprising a metal element-containing coordinate composition is provided, in which the metal element is at least one metal element in Group 4 elements, Group 5 elements, Group 13 elements, Group 14 elements and Group 15 elements. Into the coating liquid, β-diketone and a carboxylic acid and/or carboxylic acid derivative are incorporated so as to allow the β-diketone and the carboxylic acid and/or carboxylic acid derivative to be present by forming a coordinate structure with the metal element. The metal element-containing coordinate composition has a particle diameter of 0.5 to 5 nm, and a coating film of the metal element-containing coordinate composition having re-dissolving property can be formed from the composition. Specifically, when the metal element is Zr, Ti, Hf, V, Nb, Ta, Ga, Ge or Sn, a high refractive index film can be obtained by irradiating the formed coating film with energy rays.SELECTED DRAWING: Figure 9 【課題】光学的に透明で特定の溶媒で簡便に剥離可能な再溶解性を有し、高屈折率膜が形成可能な塗膜形成用の塗布液の提供。【解決手段】金属元素が第４族元素、第５族元素、第１３族元素、第１４族元素および第１５族元素のうちのいずれか１種類以上の金属元素である金属元素含有配位組成物を含有する塗布液において、前記塗布液中にβ−ジケトン、及びカルボン酸及び／又はカルボン酸誘導体を含有させて前記β−ジケトン、及びカルボン酸及び／又はカルボン酸誘導体が前記金属元素と配位構造を形成して存在し、前記金属元素含有配位組成物の粒径が０．５から５ｎｍであり、再溶解可能な金属元素含有配位組成物含有塗膜が形成可能である塗布液。特に、金属元素がＺｒ、Ｔｉ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｇａ、Ｇｅ及びＳｎの場合形成された塗膜にエネルギー線を照射する事により高屈折率膜を得ることができる。【選択図】図９