Patent ID: 8303852

Claim:
A carbon black-dispersed polyamic acid solution composition, comprising: a polyamic acid solution obtained by a reaction of substantially equimolar amounts of biphenyltetracarboxylic dianhydride and aromatic diamine; and a carbon black of 2% to 6% volatile content produced by an oil furnace process, the carbon black having a pH of 2 to 4, a nitrogen absorption specific surface area of 90 to 130 m 2 /g, a DBP absorption of 40 to 120 ml/100 g, a powder resistance of 3 to 30 Ω/cm, and containing PAH in an extracted amount of 10 ppm or less, the solution composition having a solid content of 23 weight % or more, and the solid having a carbon black content of 20 to 30 weight %.