Method of producing microfibrillated cellulose
US-2015337493-A1 · Nov 26, 2015 · US
Method for producing cellulose nanofibers
US11905657B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11905657-B2 |
| Application number | US-201916978967-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 18, 2019 |
| Priority date | Mar 20, 2018 |
| Publication date | Feb 20, 2024 |
| Grant date | Feb 20, 2024 |
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Abstract
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Provided is a method for producing cellulose nanofibers by refining pulp fibers, wherein the method enables obtaining cellulose nanofibers in which a decrease in a molecular weight of cellulose is suppressed, and which can demonstrate superior strength and the like. The present invention is a method for producing cellulose nanofibers, the method including: pretreating pulp fibers in a slurry; and refining, using a high-pressure homogenizer, the pulp fibers in the slurry, the pulp fibers being pretreated, wherein a weight average molecular weight of cellulose of cellulose nanofibers obtained through the refining is 65% or more of a weight average molecular weight of cellulose of the pulp fibers before the pretreating.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing cellulose nanofibers, the method comprising: pretreating pulp fibers in a slurry; and refining, using a high-pressure homogenizer, the pulp fibers in the slurry, the pulp fibers being pretreated, wherein as the pretreating, the pulp fibers are coarsely fibrillated, using a refiner apparatus, without being chemically treated, a fines content of the pulp fibers which are subjected to the pretreating and are to be subjected to the refining is 50% or more, and a weight average molecular weight of cellulose of cellulose nanofibers obtained through the refining is 65% or more of a weight average molecular weight of cellulose of the pulp fibers before the pretreating. 2. The method for producing cellulose nanofibers according to claim 1 , wherein a mode diameter of the cellulose nanofibers in a pseudo-particle size distribution curve is 40 μm or less.
Assignees
Inventors
Classifications
- D21D1/20Primary
Methods of refining · CPC title
Preparatory treatment of cellulose for making derivatives thereof {, e.g. pre-treatment, pre-soaking, activation} · CPC title
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title
Highly hydrated, swollen or fibrillatable fibres · CPC title
- D21C9/002Primary
by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives · CPC title
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- What does patent US11905657B2 cover?
- Provided is a method for producing cellulose nanofibers by refining pulp fibers, wherein the method enables obtaining cellulose nanofibers in which a decrease in a molecular weight of cellulose is suppressed, and which can demonstrate superior strength and the like. The present invention is a method for producing cellulose nanofibers, the method including: pretreating pulp fibers in a slurry; a…
- Who is the assignee on this patent?
- Daio Seishi Kk
- What technology area does this patent fall under?
- Primary CPC classification D21D1/20. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Feb 20 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).