Liquid crystal polyester as well as preparation method and application thereof

• Main Authors: JIANG SUJUN, CHEN PINGXU, XIAO ZHONGPENG, YE NANBIAO, HUANG XIANBO, XIAO ZEFAN
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention discloses liquid crystal polyester and a preparation method and application thereof, the liquid crystal polyester comprises 24.1 mol%-77 mol% of a repetitive unit (I) based on the total amount of repetitive units, and the repetitive unit (I) has a phenylene structure; the amount of the repetitive unit (II) is 23 mol%-75.9 mol%, and the repetitive unit (II) has a naphthylene structure. The liquid crystal polyester provided by the invention has extremely low dielectric constant and dielectric loss, the processability and flexibility of a blow-molded film are improved, and the non-uniformity of the appearance and dielectric property of a liquid crystal polyester film caused by blending of aliphatic polyester additives is avoided. 本发明公开了一种液晶聚酯及其制备方法和应用，所述液晶聚酯以重复单元总量计，重复单元(I)的量为24.1mol％-77mol％，所述重复单元(I)具有亚苯基结构；重复单元(II)的量为23mol％-75.9mol％，所述重复单元(II)具有亚萘基结构。本发明提供的液晶聚酯在具有极低的介电常数、介电损耗的同时，其吹塑成膜的可加工性以及柔韧性均得到了提升，避免了通过共混脂肪族聚酯类添加剂而导致的液晶聚酯薄膜外观和介电性能的不均匀性。