| 摘要 |
The present invention provides a liquid-crystalline polyester obtainable by a method comprising the steps of;
preparing a prepolymer consisting of the repeating units represented by formulae (I), (II), (III) and (IV):
wherein, 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
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. |
