Abstract: A polyimide precursor solution includes a polyimide precursor; an imidazole compound; a tertiary amine compound other than the imidazole compound; and an aqueous solvent containing water, in which a ratio of the number of moles of the imidazole compound to the number of moles of a tetracarboxylic dianhydride component of the polyimide precursor is 0.5 or more and less than 1.6, a ratio of the number of moles of the tertiary amine compound to the number of moles of the imidazole compound is within a range of 0.3 to 6.0, and a content of the water is 50% by mass or more with respect to the aqueous solvent.

Abstract: A polyimide precursor solution includes: a polyimide precursor; an aqueous solvent containing a water-soluble organic solvent and water; and particles, in which the particles have a volume average particle diameter within a range of 2.5 ?m to 30 ?m, an average circularity within a range of 0.900 to 0.990, and a standard deviation of circularity distribution of less than or equal to 0.1.

Abstract: A polyimide precursor solution includes a polyimide precursor having a weight average molecular weight within a range of 20000 to 80000, particles, and an aqueous solvent. The aqueous solvent contains an organic amine compound (A) (excluding a water-soluble organic solvent (B) described below), a water-soluble organic solvent (B) containing at least one selected from the group consisting of N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, N,N-dimethylformamide, and N,N-dimethylacetamide, and water (C). A content ratio [(A):(B):(C)] of (A), (B), and (C) is within a range of 0.02 to 0.07:0.02 to 0.05:0.88 to 0.96 in terms of mass ratio.

Abstract: A polyimide precursor solution includes a polyimide precursor, an aqueous solvent containing dimethyl sulfoxide and water, and particles. The content of the dimethyl sulfoxide relative to the particles is within a range of 0.15 to 2.00 in terms of mass ratio.