Liquid-crystalline polyester resin and method for producing it

Details Liquid-crystalline polyester resin and method for producing it Liquid-crystalline polyester resin and method for producing it

2007-12-04

2007-12-04

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C264S176100, C264S219000, C528S190000, C528S192000, C528S193000, C528S194000

Reexamination Certificate

active

11179683

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):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 (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.

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