Method for producing carboxymethyl cellulose or salt thereof, and binding agent for electrode
US-2019055323-A1 · Feb 21, 2019 · US
Powder containing carboxymethylated cellulose nanofibers
US12049522B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12049522-B2 |
| Application number | US-201917058207-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 28, 2019 |
| Priority date | May 29, 2018 |
| Publication date | Jul 30, 2024 |
| Grant date | Jul 30, 2024 |
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Abstract
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A powder that contains carboxymethylated cellulose nanofibers, said carboxymethylated cellulose nanofibers having a degree of carboxymethyl substitution of 0.50 or less and a cellulose type I crystallinity of 60% or more, and has a median diameter of 10.0 μm to 150.0 μm. This powder is suitable usable as an additive.
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The invention claimed is: 1. A powder comprising carboxymethylated cellulose nanofibers, wherein the powder has a median diameter of from 10.0 μm to 150.0 μm, wherein the carboxymethylated cellulose nanofibers have a degree of carboxymethyl substitution of 0.50 or less and a degree of crystallization of cellulose I type of 60% or more and wherein the carboxymethylated cellulose nanofibers exhibit a transmittance to light at a wavelength of 660 nm of 70% or more when the carboxymethylated cellulose nanofibers are dispersed in water to form a water dispersion having a solid content of 1% (w/v). 2. The powder according to claim 1 , wherein the powder has an angle of repose in the range from 30.0° to 60.0°. 3. The powder according to claim 2 , comprising the carboxymethylated cellulose nanofibers and 5% by mass to 300% by mass of a water-soluble polymer based on an absolute dry mass of the carboxymethylated cellulose nanofibers. 4. The powder according to claim 3 , wherein the carboxymethylated cellulose nanofibers are produced by mercerizing a cellulose in a solvent containing mainly water to produce a mercerized cellulose, then carboxymethylating the mercerized cellulose in a mixed solvent of water and an organic solvent to produce a carboxymethylated cellulose, and then defibrating the carboxymethylated cellulose to provide the carboxymethylated cellulose nanofibers. 5. The powder according to claim 4 , wherein the solvent containing mainly water is a solvent containing more than 50% by mass of water. 6. The powder according to claim 5 , wherein the carboxymethylated cellulose nanofibers have an average fiber diameter of from 3 nm to 500 nm. 7. The powder according to claim 1 , comprising the carboxymethylated cellulose nanofibers and 5% by mass to 300% by mass of a water-soluble polymer based on an absolute dry mass of the carboxymethylated cellulose nanofibers. 8. The powder according to claim 1 , wherein the carboxymethylated cellulose nanofibers are produced by mercerizing a cellulose in a solvent containing mainly water to produce a mercerized cellulose, then carboxymethylating the mercerized cellulose in a mixed solvent of water and an organic solvent to produce a carboxymethylated cellulose, and then defibrating the carboxymethylated cellulose to provide the carboxymethylated cellulose nanofibers. 9. The powder according to claim 8 , wherein the solvent containing mainly water is a solvent containing more than 50% by mass of water. 10. The powder according to claim 1 , wherein the carboxymethylated cellulose nanofibers have an average fiber diameter of from 3 nm to 500 nm. 11. The powder according to claim 1 , wherein the water dispersion has a transmittance to light at 660 nm of 80% or more. 12. The powder according to claim 1 , wherein the water dispersion has a transmittance to light at 660 nm of 90% or more.
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- What does patent US12049522B2 cover?
- A powder that contains carboxymethylated cellulose nanofibers, said carboxymethylated cellulose nanofibers having a degree of carboxymethyl substitution of 0.50 or less and a cellulose type I crystallinity of 60% or more, and has a median diameter of 10.0 μm to 150.0 μm. This powder is suitable usable as an additive.
- Who is the assignee on this patent?
- Jujo Paper Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08L1/286. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 30 2024 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).