| abstract |
The invention provides a coating solution, which can sufficiently ensure the adhesion to a glass substrate even if the temperature is increased when the polyamic acid (PAA) coating film is thermally cured, and can be removed from the glass substrate after thermal curing. It can be easily peeled off in the form of polyimide film, and its storage stability is good. The present invention relates to a coating solution for a glass substrate, which comprises a PAA, a fluorene-based solvent, and an alkoxysilane compound, and is characterized in that: 1) the content of the alkoxysilane compound exceeds the mass of the PAA; 5 ppm and less than 100 ppm; 2) The molecular weight of the alkoxysilane compound is 100 or more and 300 or less. |