Cellulose nanofiber, production method of same and cellulose nanofiber dispersion
US-8992728-B2 · Mar 31, 2015 · US
Fine cellulose fiber dispersion liquid and manufacturing method thereof, cellulose film and laminate body
US9850352B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9850352-B2 |
| Application number | US-201615342510-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 3, 2016 |
| Priority date | Mar 9, 2010 |
| Publication date | Dec 26, 2017 |
| Grant date | Dec 26, 2017 |
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Abstract
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A method of manufacturing a fine cellulose fiber dispersion liquid includes: an oxidation process in which a cellulose is subjected to an oxidation treatment to obtain an oxidized cellulose; and a dispersion process in which the oxidized cellulose obtained in the oxidation process is subjected to a dispersion treatment in a water-based medium in which a pH thereof is adjusted to 4 to 12 using either an ammonia water or an organic alkali to obtain the fine cellulose fiber dispersion liquid.
First claim
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The invention claimed is: 1. A method of manufacturing a fine cellulose fiber dispersion liquid, comprising: an oxidation process in which a cellulose is subjected to an oxidation treatment to obtain an oxidized cellulose having a carboxyl group: and a dispersion process in which the oxidized cellulose obtained in the oxidation process is subjected to a dispersion treatment in a water-based medium in which a pH thereof is adjusted to greater than 7 to 12 using either an ammonia water or an organic alkali to obtain the fine cellulose fiber dispersion liquid. 2. The method according to claim 1 , wherein the organic alkali is either an amine or an organic onium compound comprising a hydroxide ion as a counter ion. 3. The method according to claim 1 , wherein the organic alkali is a quaternary ammonium compound having a hydroxide ion as a counter ion. 4. The method according to claim 1 , wherein the water-based medium is either water or a mixed liquid comprising water and an alcohol, and the alcohol is methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, or 2-butanol. 5. The method according to claim 1 , wherein the fine cellulose fiber dispersion comprises a water-soluble organic solvent, and the water-soluble organic solvent is at least one organic solvent selected from the group consisting of methanol, ethanol, 2-propanol, acetone, methyl ethyl ketone, 1,4-dioxane, tetrahydrofuran, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, acetonitrile, and ethyl acetate. 6. The method according to claim 1 , further comprising: a preparation process to be performed after the dispersion process by adding a water-soluble organic solvent to the obtained fine cellulose fiber dispersion liquid, the water-soluble organic solvent being at least one organic solvent selected from the group consisting of methanol, ethanol, 2-propanol, acetone, methyl ethyl ketone, 1,4-dioxane, tetrahydrofuran, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, acetonitrile, and ethyl acetate. 7. The method according to claim 1 , wherein in the dispersion process, the pH is adjusted to 8 to 12.
Assignees
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Classifications
Oxycellulose; Hydrocellulose; {Cellulosehydrate, e.g. microcrystalline cellulose} · CPC title
- C08L1/04Primary
Oxycellulose; Hydrocellulose {, e.g. microcrystalline cellulose} · CPC title
Oxycellulose; Hydrocellulose · CPC title
- C08J3/03Primary
in aqueous media · CPC title
Oxycellulose; Hydrocellulose · CPC title
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- What does patent US9850352B2 cover?
- A method of manufacturing a fine cellulose fiber dispersion liquid includes: an oxidation process in which a cellulose is subjected to an oxidation treatment to obtain an oxidized cellulose; and a dispersion process in which the oxidized cellulose obtained in the oxidation process is subjected to a dispersion treatment in a water-based medium in which a pH thereof is adjusted to 4 to 12 using e…
- Who is the assignee on this patent?
- Toppan Printing Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08L1/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 26 2017 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).