Method for producing low polymerization degree cellulose ether
US-10906992-B2 · Feb 2, 2021 · US
Method for producing depolymerized cellulose ether
US11879022B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11879022-B2 |
| Application number | US-202117505926-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 20, 2021 |
| Priority date | Oct 22, 2020 |
| Publication date | Jan 23, 2024 |
| Grant date | Jan 23, 2024 |
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Abstract
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There is provided a method for producing a depolymerized cellulose ether having yellowness reduced. More specifically, there is provided a method for producing a depolymerized cellulose ether comprising a depolymerization step of depolymerizing a cellulose ether with an aqueous solution of acid in the presence of a polyhydric alcohol having 2 to 6 carbon atoms.
First claim
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The invention claimed is: 1. A method for producing a depolymerized cellulose ether, the method comprising a depolymerization step of depolymerizing a cellulose ether with an aqueous solution of acid in the presence of a polyhydric alcohol having 2 to 6 carbon atoms, wherein a ratio of the mass of liquid in a depolymerization reaction of the depolymerization step to the total mass in the depolymerization reaction is from 0.5 to 20.0% by mass. 2. The method for producing a depolymerized cellulose ether according to claim 1 , wherein the mass of the liquid in the depolymerization reaction of the depolymerization step is the total mass of the polyhydric alcohol, water contained in the cellulose ether to be depolymerized, and water contained in the aqueous solution of acid. 3. The method for producing a depolymerized cellulose ether according to claim 2 , wherein the depolymerization step comprises adding the polyhydric alcohol and the aqueous solution of acid in this order, in reverse order, simultaneously or as a mixture thereof to the cellulose ether to be depolymerized. 4. The method for producing a depolymerized cellulose ether according to claim 3 , wherein the polyhydric alcohol is selected from the group consisting of an alkylene-containing polyhydric alcohol and an oxyalkylene-containing polyhydric alcohol. 5. The method for producing a depolymerized cellulose ether according to claim 3 , wherein the cellulose ether is selected from the group consisting of an alkyl cellulose, a hydroxyalkyl cellulose and a hydroxyalkyl alkyl cellulose. 6. The method for producing a depolymerized cellulose ether according to claim 2 , wherein the polyhydric alcohol is selected from the group consisting of an alkylene-containing polyhydric alcohol and an oxyalkylene-containing polyhydric alcohol. 7. The method for producing a depolymerized cellulose ether according to claim 2 , wherein the cellulose ether is selected from the group consisting of an alkyl cellulose, a hydroxyalkyl cellulose and a hydroxyalkyl alkyl cellulose. 8. The method for producing a depolymerized cellulose ether according to claim 1 , wherein the depolymerization step comprises adding the polyhydric alcohol and the aqueous solution of acid in this order, in reverse order, simultaneously or as a mixture thereof to the cellulose ether to be depolymerized. 9. The method for producing a depolymerized cellulose ether according to claim 8 , wherein the polyhydric alcohol is selected from the group consisting of an alkylene-containing polyhydric alcohol and an oxyalkylene-containing polyhydric alcohol. 10. The method for producing a depolymerized cellulose ether according to claim 8 , wherein the cellulose ether is selected from the group consisting of an alkyl cellulose, a hydroxyalkyl cellulose and a hydroxyalkyl alkyl cellulose. 11. The method for producing a depolymerized cellulose ether according to claim 1 , wherein the polyhydric alcohol is selected from the group consisting of an alkylene-containing polyhydric alcohol and an oxyalkylene-containing polyhydric alcohol. 12. The method for producing a depolymerized cellulose ether according to claim 11 , wherein the cellulose ether is selected from the group consisting of an alkyl cellulose, a hydroxyalkyl cellulose and a hydroxyalkyl alkyl cellulose. 13. The method for producing a depolymerized cellulose ether according to claim 1 , wherein the cellulose ether is selected from the group consisting of an alkyl cellulose, a hydroxyalkyl cellulose and a hydroxyalkyl alkyl cellulose.
Assignees
Inventors
Classifications
- C08B11/20Primary
Post-etherification treatments of chemical or physical type, {e.g. mixed etherification in two steps}, including purification · CPC title
- C08J3/00Primary
Processes of treating or compounding macromolecular substances · CPC title
- C08B11/02Primary
Alkyl or cycloalkyl ethers · CPC title
Alkyl ethers · CPC title
with halogen-substituted hydrocarbon radials · CPC title
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- What does patent US11879022B2 cover?
- There is provided a method for producing a depolymerized cellulose ether having yellowness reduced. More specifically, there is provided a method for producing a depolymerized cellulose ether comprising a depolymerization step of depolymerizing a cellulose ether with an aqueous solution of acid in the presence of a polyhydric alcohol having 2 to 6 carbon atoms.
- Who is the assignee on this patent?
- Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C08B11/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 23 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).