| abstract |
(57) [Summary] [Top] A top that covers a substrate surface and has an optical semiconductor layer on it, which does not require long-term or high-temperature conditions for curing and drying, and is excellent in durability and weather resistance. An object is to provide a coating composition for forming a coat layer. According to the present invention, in order to solve the above-mentioned problems, (a) a polymer film precursor capable of forming a film mainly composed of a polymer containing a zirconium atom as a skeleton (B) 50 to 99.95 parts by weight of an organic solvent, for coating the surface of a substrate and forming a top coat layer containing an optical semiconductor thereon. A composition is provided. |