Aromatic liquid crystal polyester, liquid crystal polyester composition and method for manufacturing liquid crystal polyester film

Patent metadata

Field	Value
Publication number	US-12187947-B2
Application number	US-202117333122-A
Country	US
Kind code	B2
Filing date	May 28, 2021
Priority date	Jun 2, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

An aromatic liquid crystal polyester, having repeating units represented by formulae (1) and (2), respectively:

where R′, Ar 1 , Ar 2 , Ar 3 , X, Y 1 , Y 2 and Z are those as defined in the specification. Also, a liquid crystal polyester composition including the aromatic liquid crystal polyester and a solvent. The composition has an improved viscosity stability. Also, a liquid crystal polyester film prepared from the liquid crystal polyester composition and a method for manufacturing the same. The liquid crystal polyester film has excellent properties such as a low hygroscopicity and a low dissipation factor (Df).

First claim

What is claimed is:

1. An aromatic liquid crystal polyester, comprising repeating units represented by formulae (1) and (2), respectively:

wherein
X is —C(═O)—, —O— or —NR′—, wherein R′ is H or alkyl having 1 to 4 carbon atoms;
Ar 1 is divalent aryl selected from the group consisting of phenylene, naphthylene, biphenylene and

wherein L is —O—, —S—, —S(═O) 2 —, —C(═O)— or C 1 -C 4 alkylene, and the aryl moiety in Ar 1 may be unsubstituted or substituted with alkyl having 1 to 4 carbon atoms, alkoxyl having 1 to 4 carbon atoms, aryl having 6 to 20 carbon atoms, or halogen;
Ar 2 and Ar 3 may be the same or different, each comprises a divalent aryl moiety independently selected from the group consisting of phenylene, naphthylene and biphenylene, wherein the divalent aryl moiety in Ar 2 and Ar 3 may be unsubstituted or substituted with alkyl having 1 to 4 carbon atoms, alkoxyl having 1 to 4 carbon atoms, aryl having 6 to 20 carbon atoms, or halogen;
Y 1 and Y 2 are independently selected from the group consisting of —O—, —NH— or —C(═O)—; and
Z is

wherein R 1 and R 2 are the same or different and independently selected from the group consisting of a hydrogen atom, alkyl having 1 to 8 carbon atoms, an aryl group having 6 to 15 carbon atoms, and halogen;
m is any integer from 4 to 13, wherein the repeating unit represented by formula (1) accounts for 10 to 35 mole percentage in the aromatic liquid crystal polyester; and the repeating unit represented by formula (2) accounts for 1 to 9 mole percentage in the aromatic liquid crystal polyester.

2. The aromatic liquid crystal polyester according to claim 1 , wherein Z is

wherein R 1 and R 2 are the same or different and are independently selected from the group consisting of a hydrogen atom, alkyl having 1 to 8 carbon atoms, an aryl group having 6 to 15 carbon atoms, and halogen.

3. The aromatic liquid crystal polyester according to claim 1 , wherein Y 1 and Y 2 are —O—.

4. The aromatic liquid crystal polyester according to claim 1 , which is composed of the following monomers:
(i) a monomer of aromatic aminocarboxylic acid having an aryl moiety Ar 1 ; and
(ii) an aromatic diol monomer having a formula HO—Ar 2 —Z—Ar 3 —OH,
wherein Z, Ar 1 , Ar 2 and Ar 3 are those as defined in claim 1 .

5. A liquid crystal polyester composition, comprising an aromatic liquid crystal polyester according to claim 1 and a solvent.

6. The liquid crystal polyester composition according to claim 5 , wherein the solvent is N-methyl-2-pyrrolidone, N,N-dimethylacetamide, γ-butyrolactone, or dimethyl formamide.

7. The liquid crystal polyester composition according to claim 5 , further comprising a filler selected from an organic filler, an inorganic filler and a combination thereof.

8. A method for manufacturing a liquid crystal polyester film, comprising:
applying the liquid crystal polyester composition according to claim 5 onto a carrier plate to form a coating;
removing the solvent from the coating; and
performing heat treatment to melt the liquid crystal polyester and form a liquid crystal polyester film.

Assignees

• Eternal Mat Co Ltd

Inventors

• Chang Jia-Cheng
• Yeh Wei-Ting
• Liu Wen-Cheng

Classifications

• C08J2367/00

  Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers · CPC title

• C09K19/3809 Primary

  Polyesters; Polyester derivatives, e.g. polyamides · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08G63/78

  Preparation processes · CPC title

• C08G63/685 Primary

  containing nitrogen · CPC title