Fujifilm Business Innovation Corp.

Kosuke Nakada

Hidekazu Hirose

Tomoya Sasaki

Yasunobu Kashima

Kosaku Yoshimura

Hajime Sugahara

Tomoyo Okubo

Takeshi Iwanaga

Shigeru Seitoku

A particle-dispersed polyimide precursor solution contains a polyimide precursor having a unit represented by the following formula (I), particles, and a solvent, in which the particle-dispersed polyimide precursor solution satisfies both the following conditions (1) and (2),

Particle-dispersed polyimide precursor solution, method for producing porous polyimide film, and porous polyimide film

A polyimide precursor solution contains: an aqueous solvent containing water; particles; and a polyimide precursor, wherein the polyimide precursor has a high molecular weight region A containing a high molecular weight side maximum value and a low molecular weight region B containing a low molecular weight side maximum value in an elution curve obtained by gel permeation chromatography, a weight average molecular weight in the high molecular weight region A is 50,000 or more, a weight average molecular weight in the low molecular weight region B is 10,000 or more and 30,000 or less, and a value of a/(a+b) is 0.60 or more and 0.98 or less in which a represents an area of the high molecular weight region A and b represents an area of the low molecular weight region B.

Polyimide precursor solution, method for producing porous polyimide film, and porous polyimide film

A polyimide precursor solution includes: a polyimide precursor; polyester resin particles containing a polyester resin and having a volume average particle diameter of from 3 &#x3bc;m to 50 &#x3bc;m inclusive and an average circularity of 0.970 or more; and a solvent.

Polyimide precursor solution, method for producing porous polyimide film, porous polyimide film, and insulated wire

A particle-dispersed polyimide precursor solution contains: a polyimide precursor consisting of a polymer of a tetracarboxylic dianhydride and a diamine containing a fluorene-based diamine having a fluorene skeleton; particles; and an aqueous solvent containing water.

A polyimide precursor-containing aqueous composition contains at least one polymer material selected from the group consisting of a water-insoluble fibrous organic substance and a polyalkylene oxide having a viscosity-average molecular weight of 5 million or more, a polyimide precursor, particles, and water.

Polyimide precursor-containing aqueous composition, method for producing polyimide film, and method for producing porous polyimide film

A porous polyimide film has plural pores, in which an average flattening of the plural pores is within a range of 0.1 to 0.7, a coefficient of variation of a distance between adjacent pores is within a range of 0.10 to 0.40, and a front surface and aback surface communicate with each other through the plural pores.

Growing community of inventors

Kanagawa, Japan

Kosuke Nakada