Granted Patent B2

US 12,187,947 · App. 17/333,122 · Granted Jan 7, 2025

Inventors: Jia-Cheng Chang (Kaohsiung, TW); Wei-Ting Yeh (Kaohsiung, TW); Wen-Cheng Liu (Kaohsiung, TW)

Assignee: ETERNAL MATERIALS CO., LTD.

C09K19/3809

Abstract

Claims (24)

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.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)