Poly(aryl ether) based polymers and associated gas separation membranes
US-2022282041-A1 · Sep 8, 2022 · US
Method for producing aromatic polyether, and potassium carbonate used in same
US12319785B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12319785-B2 |
| Application number | US-202118024231-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 2, 2021 |
| Priority date | Sep 2, 2020 |
| Publication date | Jun 3, 2025 |
| Grant date | Jun 3, 2025 |
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Abstract
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Provided is a method for producing an aromatic polyether, comprising reacting 4,4′-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying at least one of the following conditions (A) and (B): (A) the potassium carbonate has a bulk density of 1.2 g/ml or less; and (B) an average particle diameter D (μm) and a specific surface area S (m 2 /g) of the potassium carbonate satisfy D/S≤600.
First claim
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The invention claimed is: 1. A method for producing an aromatic polyether, comprising reacting 4,4′-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying the following conditions (A) and (B): (A) the potassium carbonate has a bulk density of 1.2 g/ml or less; and (B) an average particle diameter D (m) and a specific surface area S (m 2 /g) of the potassium carbonate satisfy D/S≤600, wherein the potassium carbonate is the only alkali metal salt used in the reaction, and a combined concentration of 4,4′-dichlorobenzophenone and hydroquinone in a solvent is 1.5 mol/1 to 4.0 mol/l. 2. The method for producing an aromatic polyether according to claim 1 , comprising reacting 4,4′-dichlorobenzophenone and hydroquinone under a condition in which none of sodium fluoride, potassium fluoride, rubidium fluoride and cesium fluoride are present. 3. The method for producing an aromatic polyether according to claim 1 , wherein the aromatic polyether to be produced has a melt flow index of 100 g/10 min or less. 4. The method for producing an aromatic polyether according to claim 1 , comprising reacting 4,4′-dichlorobenzophenone and hydroquinone in diphenyl sulfone. 5. The method for producing an aromatic polyether according to claim 1 , wherein the potassium carbonate satisfies D/S≤221. 6. The method for producing an aromatic polyether according to claim 1 , wherein said reacting is performed in a reaction mixture consisting of 4,4′-dichlorobenzophenone, hydroquinone, the potassium carbonate and the solvent.
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Preparation in the form of granules, pieces or other shaped products · CPC title
- C08G65/4087Primary
characterised by the catalyst used · CPC title
- C08G65/40Primary
from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group · CPC title
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- What does patent US12319785B2 cover?
- Provided is a method for producing an aromatic polyether, comprising reacting 4,4′-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying at least one of the following conditions (A) and (B): (A) the potassium carbonate has a bulk density of 1.2 g/ml or less; and (B) an average particle diameter D (μm) and a specific surface area S (m 2 /g) of the potassium ca…
- Who is the assignee on this patent?
- Idemitsu Kosan Co
- What technology area does this patent fall under?
- Primary CPC classification C08G65/4087. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 03 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).