Aromatic polysulfone resin and method for producing same
US-2018371171-A1 · Dec 27, 2018 · US
Aromatic polysulfone resin and method for producing same
US10676573B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10676573-B2 |
| Application number | US-201615781598-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 6, 2016 |
| Priority date | Dec 8, 2015 |
| Publication date | Jun 9, 2020 |
| Grant date | Jun 9, 2020 |
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- Title
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Abstract
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An aromatic polysulfone resin having a yellowness index of 50 or higher and a weight average molecular weight of 25,000 to 45,000 is provided.
First claim
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The invention claimed is: 1. An aromatic polysulfone resin having a repeating unit represented by formula (1): -Ph 1 -SO 2 -Ph 2 O— (1) wherein Ph 1 and Ph 2 each independently represent a phenylene group, and each hydrogen atom in the phenylene group may be independently substituted with an alkyl group of 1 to 5 carbon atoms, an aryl group of 6 to 15 carbon atoms or a halogen atom; a yellowness index of 50 or higher; and a weight average molecular weight of 25,000 to 45,000, and wherein the proportion of the repeating unit represented by formula (1) relative to the total weight of all structural units that constitute the aromatic polysulfone resin is 80 to 100% by weight. 2. The aromatic polysulfone according to claim 1 , having a light transmittance at 380 nm of not more than 5% and a light transmittance at 650 nm of at least 60%. 3. The aromatic polysulfone according to claim 1 , wherein the proportion of the repeating unit represented by formula (1) relative to the total weight of all the structural units that constitute the aromatic polysulfone resin is 100% by weight. 4. A method for producing an aromatic polysulfone resin having a yellowness index of 50 or higher and a weight average molecular weight of 25,000 to 45,000, the method comprising a step of melt kneading an aromatic polysulfone resin having a weight average molecular weight of 50,000 to 70,000 at a temperature of 390° C. or higher.
Assignees
Inventors
Classifications
Polysulfones · CPC title
Post-polymerisation treatment · CPC title
- C08G75/23Primary
Polyethersulfones · CPC title
Phenols and polyhydroxy ethers · CPC title
Agricultural use or equipment · CPC title
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- What does patent US10676573B2 cover?
- An aromatic polysulfone resin having a yellowness index of 50 or higher and a weight average molecular weight of 25,000 to 45,000 is provided.
- Who is the assignee on this patent?
- Sumitomo Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C08G75/23. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 09 2020 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).