Polarization plate and liquid crystal display
US-9507202-B2 · Nov 29, 2016 · US
Cellulose acetate and method for producing cellulose acetate
US11066484B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11066484-B2 |
| Application number | US-201616067904-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 12, 2016 |
| Priority date | Jan 12, 2016 |
| Publication date | Jul 20, 2021 |
| Grant date | Jul 20, 2021 |
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- Title
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Abstract
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Provided is cellulose acetate with which a hollow fiber membrane having excellent salt rejection and water permeability can be produced. The cellulose acetate, in which a total content of calcium and magnesium is 2.8 to 3.5 μmol/g; a 6 percent viscosity is 40 to 80 mPa·s; a degree of filtration Kw is 35 g −1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetylation is 61.3 to 62.3%.
First claim
Opening claim text (preview).
The invention claimed is: 1. A cellulose acetate, wherein: a total content of calcium and magnesium is 2.8 to 3.5 μmol/g; a 6 percent viscosity is 40 to 80 mPa·s; a degree of filtration Kw is 35 g −1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetylation is 61.3 to 62.3%. 2. The cellulose acetate according to claim 1 , wherein the degree of filtration Kw is 30 g −1 or less. 3. The cellulose acetate according to claim 1 , wherein a calcium content is 80 to 200 ppm. 4. The cellulose acetate according to claim 1 , wherein a half-value width of composition distribution is 1.0% or less. 5. The cellulose acetate according to claim 1 , wherein a 6-position substitution degree is 0.92 or more. 6. The cellulose acetate according to claim 1 , wherein a total sulfuric acid concentration is 40 to 150 ppm.
Assignees
Inventors
Classifications
Rendering cellulose suitable for esterification {(esterification per se, C08B3/00, C08B5/00, C08B7/00 or C08B9/00)} · CPC title
Cellulose acetate · CPC title
Macromolecular compounds derived from lignocellulosic materials {(pretreatment thereof B27N)} · CPC title
by precipitation · CPC title
Hydrolysis or ripening · CPC title
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- What does patent US11066484B2 cover?
- Provided is cellulose acetate with which a hollow fiber membrane having excellent salt rejection and water permeability can be produced. The cellulose acetate, in which a total content of calcium and magnesium is 2.8 to 3.5 μmol/g; a 6 percent viscosity is 40 to 80 mPa·s; a degree of filtration Kw is 35 g −1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetyl…
- Who is the assignee on this patent?
- Daicel Corp
- What technology area does this patent fall under?
- Primary CPC classification C08B3/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 20 2021 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).