Liquid crystal polyester and film comprising the same
US12077705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2023 |
| Grant date | Sep 3, 2024 |
| Priority date | — |
| Expiry date | Mar 9, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2219/13
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A liquid crystal polyester comprising a repeating unit derived from an aromatic hydroxycarboxylic acid. The content of the repeating unit derived from an aromatic hydroxycarboxylic acid is 80% or more based on 100% of a total number of all repeating units of the liquid crystal polyester. The repeating unit derived from an aromatic hydroxycarboxylic acid comprises a repeating unit (A1) represented by the formula (A1) and a repeating unit (A2) represented by the formula (A2). A ratio [repeating unit (A2)/repeating unit (A1)] is 1.2 or larger. A molar ratio [phenolic hydroxyl groups/(the phenolic hydroxyl groups+acyl groups)] is 0.3 or lower, as calculated by 1H-NMR. —O—Ar11—CO— (A1)—O—Ar12—CO— (A1) Ar11 represents a phenylene group and Ar12 represents a naphthylene group. A hydrogen atom is optionally substituted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.