Liquid-crystal polyester resin

1 . A liquid-crystalline polyester resin, essentially consisting of the repeating units represented by formulae [I]-[IV]:

wherein Ar 1 and Ar 2 independently represent one or more bivalent aromatic group;

p, q, r and s represent relative molar proportions (mol %) of the repeating units based on the total repeating units represented by formulae [I]-[IV] in the liquid-crystalline polyester resin and satisfy the following formulae:

0.4≦ p/q≦ 2.0,

2≦r≦15,

2≦s≦15, and

p+q+r+s= 100,

provided that the liquid-crystalline polyester resin has a melting point of 190-205° C. determined by differential scanning calorimetry.

2 . The liquid-crystalline polyester resin according to claim 1 , wherein p, q, r and s satisfy the following formulae:

35≦p≦48,

35≦q≦48,

2≦r≦15,

2≦s≦15, and

p+q+r+s= 100.

3 . The liquid-crystalline polyester resin according to claim 1 , wherein:

Ar 1 represents:

Ar 2 represents:

4 . The liquid-crystalline polyester resin according to claim 1 , wherein both Ar 1 and Ar 2 represent:

5 . A liquid-crystalline polyester resin composition comprising 100 parts by weight of the liquid-crystalline polyester resin according to claim 1 and 0.1-200 parts by weight of one or more of fibrous, plate or particulate filler and/or reinforcement.

6 . A molded article obtained by molding the liquid-crystalline polyester resin or the liquid-crystalline polyester resin composition according to claim 1 .

7 . The liquid-crystalline polyester resin according to claim 2 , wherein:

Ar 1 represents:

Ar 2 represents:

8 . The liquid-crystalline polyester resin according to claim 2 , wherein both Ar 1 and Ar 2 represent: