Polyamidic acid-containing and fine particles-dispersed composition and production process therefor

A process for producing a polyamidic acid-containing and fine particles-dispersed composition, which comprises the steps of:

• dissolving an organic polymer into a polar solvent;
• adding fine particles to the resultant solution;
• dispersing the fine particles into this solution to prepare a fine particle dispersion;
• and
• mixing the resultant fine particle dispersion and a polyamidic acid solution;
• wherein the fine particles are carbon black and/or silica particles.

A process for producing a polyamidic acid-containing and fine particles-dispersed composition, which comprises the steps of:

• dissolving an organic polymer into a polar solvent;
• adding fine particles to the resultant solution;
• dispersing the fine particles into this solution to prepare a fine particle dispersion;
• and
• polymerizing a tetracarboxylic dianhydride along with a diamine and/or diisocyanate as raw materials in the fine particle dispersion to prepare a polyamidic acid;
• wherein the fine particles are carbon black and/or silica particles.

A process for producing a fine particles-dispersed composition, wherein the fine particles-dispersed composition comprises fine particles and a polar solvent solution, and wherein the fine particles are silica particles,

• wherein the process comprises the step of dispersing the fine particles into the polar solvent solution using an organic polymer as a dispersant,
• wherein the organic polymer as a dispersant has a functional group reactable with the silica particles;
• and
• the silica particles are in the form of polymer-grafted silica particles modified with the organic polymer.