POLYIMIDE PRECURSOR SOLUTION AND METHOD FOR PRODUCING POLYIMIDE FILM
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.
1 . A polyimide precursor solution comprising:
a polyimide precursor;
an aqueous solvent containing dimethyl sulfoxide and water; and
particles,
wherein a content of the dimethyl sulfoxide relative to the particles is within a range of 0.15 to 2.00 in terms of mass ratio.
2 . The polyimide precursor solution according to claim 1 , wherein a content of the water relative to the aqueous solvent is within a range of 60% by mass to 90% by mass.
3 . The polyimide precursor solution according to claim 1 , wherein the polyimide precursor solution contains the particles within a range of 40% by volume to 80% by volume relative to a total volume of a solid content of the polyimide precursor and the particles.
4 . The polyimide precursor solution according to claim 3 , wherein a content of the particles is within a range of 50% by volume to 70% by volume.
5 . The polyimide precursor solution according to claim 1 , wherein the content of the dimethyl sulfoxide relative to the water is within a range of 5% by mass to 20% by mass.
6 . The polyimide precursor solution according to claim 1 , wherein the aqueous solvent contains an organic amine compound.
7 . The polyimide precursor solution according to claim 6 , wherein the organic amine compound selected from the group consisting of triethylamine, N-alkylpiperidine, 2-dimethylaminoethanol, and a tertiary cyclic amine compound.
8 . The polyimide precursor solution according to claim 7 , wherein the tertiary cyclic amine compound is a morpholine compound.
9 . The polyimide precursor solution according to claim 8 , wherein the morpholine compound is N-methylmorpholine.
10 . The polyimide precursor solution according to claim 1 , wherein the particles are resin particles.
11 . The polyimide precursor solution according to claim 10 , wherein the resin particles are selected from the group consisting of styrene resin particles, (meth)acrylic resin particles, and polyester resin particles.
12 . The polyimide precursor solution according to claim 1 , wherein the content of the dimethyl sulfoxide relative to the particles is within a range of 0.15 to 1.50 in terms of mass ratio.
13 . 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.
14 . The method for producing a polyimide resin film according to claim 13 , comprising:
imidizing the polyimide precursor contained in the film by heating the dried film to form a polyimide film; and
removing the particles.