| abstract |
The present invention provides a liquid-crystalline polyester obtainable by a method comprising the steps of: (1) preparing a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV): n nwherein, p, q, r and s represent relative molar proportions (mol %) of the repeating units in the liquid-crystalline polyester resin and satisfy the following formulae: 60≦p≦80, 10≦r≦20, 10≦q+s≦20, 0.05≦s/(q+s)≦0.3, p+q+r+s=100; and (2) heating the prepolymer in substantially solid state at 250-350° C., provided that the liquid crystalline polyester has a deflection temperature under load of 280-340° C., and a melt viscosity of 10-60 Pa·s. |