Patent ID: 7511112

Claim:
An aromatic polymer comprising structural units represented by chemical formulas (I), (II) and (III) and satisfying formulas (1) to (3) when molar fractions (%) of the structural units of the chemical formulas (I), (II) and (III) are represented by l, m and n, respectively: 80 â‰¦l+m+n â‰¦100â€ƒâ€ƒ(1) 5â‰¦mâ‰¦90â€ƒâ€ƒ(2) 20â‰¦nâ‰¦90â€ƒâ€ƒ(3); R 1 : an aromatic group, and R 2 : a para-directed phenylene group, provided that each of the hydrogen atoms at 2-, 3-, 5- and 6-positions of an aromatic ring may be substituted with another atom or substituent; R 3 : a 1,3-bis(4-phenoxy)benzene group represented by chemical formula (IV): R 4 : a para-directed phenylene group, provided that each of the hydrogen atoms at 2-, 3-, 5- and 6-positions of an aromatic ring may be substituted with another atom or substituent; R 5 : 2, 6-naphthalene group, and R 6 : a para-directed phenylene group, provided that each of the hydrogen atoms at 2-, 3-, 5- and 6-positions of an aromatic ring may be substituted with another atom or substituent.