Patent ID: 8686106

Claim:
A carbon black-dispersed polyamic acid solution composition comprising a polyamic acid solution and carbon black dispersed therein, the polyamic acid solution being obtained by reacting biphenyltetracarboxylic dianhydride and an aromatic diamine in an organic polar solvent, the biphenyltetracarboxylic dianhydride comprising 2,3,3â€²,4â€²-biphenyltetracarboxylic dianhydride and 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride; the aromatic diamine comprising 4,4â€²-diaminodiphenyl ether and p-phenylenediamine; and the polyamic acid solution having a solids content of 25 weight % or more, wherein the polyamic acid solution comprises 15 to 50 mol % of 2,3,3â€²,4â€²-biphenyltetracarboxylic dianhydride and 85 to 50 mol % of 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride per total biphenyltetracarboxylic dianhydride components; and 20 to 80 mol % of 4,4â€²-diaminodiphenyl ether and 80 to 20 mol % of p-phenylenediamine per total aromatic diamine components.