Depolymerisation of polysaccharides and related products
US-2015291707-A1 · Oct 15, 2015 · US
Method for producing low polymerization degree cellulose ether
US10906992B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10906992-B2 |
| Application number | US-201715726009-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 5, 2017 |
| Priority date | Oct 6, 2016 |
| Publication date | Feb 2, 2021 |
| Grant date | Feb 2, 2021 |
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- Title
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Abstract
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There is provided a method for producing a low polymerization degree cellulose ether having a less yellowish appearance and having excellent long-term storage stability through depolymerization of a high polymerization degree cellulose ether with an acid and without requiring an additive other than the acid. More specifically, there is provided a method for producing a low polymerization degree cellulose ether, including a step of depolymerizing a high polymerization degree cellulose ether with an acid to obtain a low polymerization degree cellulose ether mixture and a step of neutralizing the acid present in the low polymerization degree cellulose ether mixture, wherein ultraviolet is applied in the step of depolymerizing or between the steps of depolymerizing and neutralizing.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a low polymerization degree cellulose ether, comprising the steps of: depolymerizing a high polymerization degree cellulose ether with an acid to obtain a low polymerization degree cellulose ether mixture, and neutralizing the acid present in the low polymerization degree cellulose ether mixture, wherein ultraviolet is applied in the step of depolymerizing or between the steps of depolymerizing and neutralizing, and a cumulative dose of the ultraviolet is from 50 J to 300 J relative to 1 g of the high polymerization degree cellulose ether. 2. The method for producing a low polymerization degree cellulose ether according to claim 1 , wherein a viscosity reduction ratio by the depolymerizing is 60 to 99.9%, where the viscosity reduction ratio is a ratio of a difference between viscosities at 20° C. of 2% by weight aqueous solutions of the high polymerization degree cellulose ether and the low polymerization degree cellulose ether to a viscosity at 20° C. of the 2% by weight aqueous solution of the high polymerization degree cellulose ether. 3. The method for producing a low polymerization degree cellulose ether according to claim 1 , wherein the high polymerization degree cellulose ether is an alkyl cellulose, a hydroxyalkyl cellulose, or a hydroxyalkyl alkyl cellulose.
Assignees
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Classifications
Preparation of other cellulose derivatives or modified cellulose {, e.g. complexes} · CPC title
Post-etherification treatments of chemical or physical type, {e.g. mixed etherification in two steps}, including purification · CPC title
- C08B11/02Primary
Alkyl or cycloalkyl ethers · CPC title
- C08B11/00Primary
Preparation of cellulose ethers {(rendering cellulose suitable for etherification C08B1/06)} · CPC title
- C08B11/08Primary
with hydroxylated hydrocarbon radicals; Esters, ethers, or acetals thereof · CPC title
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- What does patent US10906992B2 cover?
- There is provided a method for producing a low polymerization degree cellulose ether having a less yellowish appearance and having excellent long-term storage stability through depolymerization of a high polymerization degree cellulose ether with an acid and without requiring an additive other than the acid. More specifically, there is provided a method for producing a low polymerization degree…
- Who is the assignee on this patent?
- Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C08B11/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 02 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).