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US-10274481-B2 · Apr 30, 2019 · US
All-aromatic liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom
US12378184B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12378184-B2 |
| Application number | US-202418438965-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 12, 2024 |
| Priority date | Sep 13, 2022 |
| Publication date | Aug 5, 2025 |
| Grant date | Aug 5, 2025 |
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- Title
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Abstract
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A family of low-molecular-weight, main-chain thermotropic liquid-crystalline polyimides (TLC-PI) that are crosslinkable is disclosed. These all-aromatic TLC-PI are derived from (i) wholly aromatic and flexible diamine monomers, in which the linkage between the two aniline-ends contains a relatively high heat-tolerant but flexible chain constituted by two or more units of 1,4-phenoxy or 1,3-phenoxy or in combinations of both. Processes of making and using such all-aromatic TLC-PI is also provided.
First claim
Opening claim text (preview).
What is claimed is: 1. A process of making an arylether diamine, said process comprising coupling an aminophenoxyphenol using a dihalobenzene or an aminophenoxyarylhalide. 2. The process of claim 1 wherein said dihalobenzene is dibromobenzene having a meta or ortho orientation or diodobenzene having meta or ortho orientation, and said aminophenoxyarylhalide is aminophenoxyarylbromide or aminophenoxyaryliodide. 3. The process of claim 1 wherein said aminophenoxyphenol has a mixed para-meta substitution pattern according to the following formulae:
Assignees
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Classifications
Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain · CPC title
from hydroxy amines by reactions involving the etherification or esterification of hydroxy groups · CPC title
polymerised by radiations · CPC title
- C07C217/90Primary
the oxygen atom of at least one of the etherified hydroxy groups being further bound to a carbon atom of a six-membered aromatic ring, e.g. amino-diphenylethers · CPC title
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- What does patent US12378184B2 cover?
- A family of low-molecular-weight, main-chain thermotropic liquid-crystalline polyimides (TLC-PI) that are crosslinkable is disclosed. These all-aromatic TLC-PI are derived from (i) wholly aromatic and flexible diamine monomers, in which the linkage between the two aniline-ends contains a relatively high heat-tolerant but flexible chain constituted by two or more units of 1,4-phenoxy or 1,3-phen…
- Who is the assignee on this patent?
- Us Gov Air Force, Us Air Force
- What technology area does this patent fall under?
- Primary CPC classification C07C217/90. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 05 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).