| abstract |
The present invention provides a composition capable of providing a cured film which can suppress generation of defects after repeated exposure in a high temperature-low temperature environment. Further, the present invention provides a coating film, a cured film, a lens, a solid-state image sensor, and a novel resin. The composition includes: a resin comprising a repeating unit represented by the following formula (I-1) or a repeating unit represented by the following formula (I-2); a solvent; and a specific metal ion selected from the group consisting of sodium ions, In the group of potassium ions and calcium ions, the total content of the specific metal ions is 0.01 to 30 ppm by mass based on the total mass of the composition. |