Patent ID: 6815526
Filing Date: 2004-11-09
Classification: C08G

Abstract:
A wholly aromatic polyester which exhibits optical anisotropy in a molten state and which comprises, as essential constituents, the constitutional unit (I) in an amount of 40 to 75 mol %, the constitutional unit (II) in an amount of 8.5 to 30 mol %, the constitutional unit (III) in an amount of 8.5 to 30 mol % and the constitutional unit (IV) in an amount of 0.1 to 8 mol % based on the total of all constitutional units, the constitutional units (I) to (IV) being represented by the following formulas: wherein Ar1 is 2,6-naphthalene; Ar2 is at least one selected from the group consisting of 1,2-phenylene, 1,3-phenylene and 1,4-phenylene; Ar3 is at least one selected from the group consisting of 1,3-phenylene, 1,4-phenylene and the residue of a compound having at least two phenylene groups connected with each other at the para position; and Ar4 is 1,4-phenylene.