Crystalline wholly aromatic polyester and method for manufacture thereof

1. A crystalline wholly aromatic polyester which is a polycondensate of an aromatic dicarboxylic acid and an aromatic diol, wherein

a structural unit derived from the aromatic dicarboxylic acid comprises a structural unit represented by formula (1):

and wherein

a structural unit derived from the aromatic diol comprises a structural unit represented by formula (4):

and the crystalline wholly aromatic polyester satisfies

80 mol % ≤[the structural unit represented by formula (1)+the structural unit represented by formula (4)] ≤100 mol %, wherein

[the structural unit represented by formula (1)]≤50 mol %, and

[the structural unit represented by formula (4)]≤50 mol %.

2. The wholly aromatic polyester according to claim 1 , wherein

the structural unit derived from the aromatic dicarboxylic acid further comprises at least one of the structural units represented by formulae (2) and (3):

3. The wholly aromatic polyester according to claim 1 , wherein

the structural unit derived from the aromatic diol further comprises at least one of the structural units represented by formulae (5), (6), (7), and (8):

wherein

Z is a bivalent substituent group having from 1 to 20 atoms, comprising at least one of a hydrocarbon radical, an oxygen atom, a sulfur atom, wherein a halogen atom may be bound to the substituent group, provided that Z is not carbonyl group —C(═O)—.

4. The wholly aromatic polyester according to claim 3 , containing the structural unit represented by formula (1) in a proportion of 50 mol %, the structural unit represented by formula (4) in a proportion of 30-45 mol %, and the structural unit represented by formula (7) in a proportion of 5-20 mol %.

5. The wholly aromatic polyester according to claim 3 , containing the structural unit represented by formula (1) in a proportion of 50 mol %, the structural unit represented by formula (4) in a proportion of 30-45 mol %, and the structural units represented by formula (8) in a proportion of 5-20 mol %.

6. The wholly aromatic polyester according to claim 3 , containing the structural unit represented by formula (1) in a proportion of 50 mol %, the structural unit represented by formula (4) in a proportion of 30-47 mol %, and one or two kinds of the structural units represented by formulae (5) and (6) in a total proportion of 3-20 mol %.

7. The wholly aromatic polyester according to claim 2 , containing the structural unit represented by formula (1) in a proportion of 30-47 mol %, the structural unit represented by formula (4) in a proportion of 50 mol %, and one or two kinds of the structural units represented by formulae (2) and (3) in a total proportion of 3-20 mol %.

8. The wholly aromatic polyester according to claim 1 , having a melting point of 300° C. or higher.

9. A method for manufacturing the wholly aromatic polyester of claim 1 which is a polycondensate of an aromatic dicarboxylic acid and an aromatic diol, wherein

the aromatic dicarboxylic acid comprises a compound represented by formula (9):

and wherein

the aromatic diol comprises a compound represented by formula (12):

wherein

the method comprises a step of deacetylation polycondensation of the aromatic dicarboxylic acid and the aromatic diol under acetic acid anhydride.

10. The method for manufacturing the wholly aromatic polyester according to claim 9 , wherein

the aromatic dicarboxylic acid further comprises at least one of the compound represented by formulae (10) and (11):

11. The method for manufacturing the wholly aromatic polyester according to claim 9 , wherein

the aromatic diol further comprises at least one of the compound represented by formulae (13), (14), (15), and (16):

wherein

Z is a bivalent substituent group having from 1 to 20 atoms, containing at least one of a hydrocarbon radical, an oxygen atom, a sulfur atom, wherein a halogen atom may be bound to the substituent group, provided that Z is not carbonyl group (—C(═O)—).

12. The method for manufacturing the wholly aromatic polyester according to claim 9 , wherein

the compounds are used in 80 mol % ≤[the compound represented by formula (9)+the compound represented by formula (12)]≤100 mol %.

13. The method for manufacturing the wholly aromatic polyester according to claim 9 , wherein

the aromatic dicarboxylic acid and the aromatic diol are deacetylation polycondensed under the presence of 1.05-1.15 equivalent of acetic acid anhydride based on —OH groups in the aromatic diol, in the deacetylation polycondensation step.

14. The method for manufacturing the wholly aromatic polyester according to claim 9 , wherein

the melting point of the wholly aromatic polyester is 300° C. or higher.