POLYIMIDE PRECURSOR SOLUTION AND METHOD FOR PRODUCING POLYIMIDE FILM
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.
1 . A polyimide precursor solution comprising:
a polyimide precursor having a weight average molecular weight within a range of 20,000 to 80,000;
particles; and
an aqueous solvent,
wherein 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); and
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.
2 . The polyimide precursor solution according to claim 1 , wherein the organic amine compound is selected from the group consisting of triethylamine, N-alkylpiperidine, 2-dimethylaminoethanol, and a tertiary cyclic amine compound.
3 . The polyimide precursor solution according to claim 2 , wherein the tertiary cyclic amine compound is a morpholine compound.
4 . The polyimide precursor solution according to claim 3 , wherein the morpholine compound is N-methylmorpholine.
5 . The polyimide precursor solution according to claim 1 , wherein the particles are contained within a range of 40% by volume to 85%, by volume relative to a total volume of a solid content of the polyimide precursor and the particles.
6 . The polyimide precursor solution according to claim 5 , wherein a content of the particles is within a range of 50% by volume to 80% by volume.
7 . The polyimide precursor solution according to claim 1 , wherein the weight average molecular weight of the polyimide precursor is within a range of 30000 to 80000.
8 . The polyimide precursor solution according to claim 1 , wherein the particles are resin particles.
9 . The polyimide precursor solution according to claim 8 , wherein the resin particles are selected from styrene resin particles, (meth)acrylic resin particles, and polyester resin particles.
10 . The polyimide precursor solution according to claim 1 , wherein a content ratio of the water (C) relative to the polyimide precursor is within a range of 900% by mass to 5000% by mass.
11 . The polyimide precursor solution according to claim 1 , wherein the content ratio [(A):(B):(C)] is within a range of 0.02 to 0.03:0.03 to 0.05:0.92 to 0.96 in terms of mass ratio.
12 . A method for producing a polyimide resin film, comprising:
applying the polyimide precursor solution according to claim 1 on a substrate to form a coating film; and
drying the coating film to form a film containing the polyimide precursor and the particles.
13 . The method for producing a polyimide resin film according to claim 12 , comprising:
imidizing the polyimide precursor contained in the film by heating the dried film to form a polyimide film; and
removing the particles.