Patent ID: 8071711

Claim:
A liquid-crystalline polyester having a structural unit represented by the following formula (i), a structural unit represented by the following formula (ii) and a structural unit represented by the following formula (iii): wherein Ar 1 is, at each occurrence, a member selected from the group consisting of a 2,6-naphthalenediyl group, a 1,4-phenylene group and a 4,4â€²-biphenylene group; and Ar 2 and Ar 3 are each independently, at each occurrence, a member selected from the group consisting of a 2,6-naphthalenediyl group, a 1,4-phenylene group, a 1,3-phenylene group and a 4,4â€²-biphenylene group, provided that one or more hydrogen atoms on the aromatic ring of each of Ar 1 , Ar 2 and Ar 3 may be substituted by a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms; wherein 40% by mole or more of all the groups Ar 1 , Ar 2 and Ar 3 are 2,6-naphthalenediyl groups; and wherein the polyester has a flow initiation temperature of from about 280 to about 320Â° C.