Modified polysaccharides
US-9820928-B1 · Nov 21, 2017 · US
Methods for producing alkali cellulose and cellulose ether
US9580516B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9580516-B2 |
| Application number | US-201213398369-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 16, 2012 |
| Priority date | Feb 21, 2011 |
| Publication date | Feb 28, 2017 |
| Grant date | Feb 28, 2017 |
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Abstract
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When a combination of pulps having different alkali metal hydroxide solution absorption rates is as a raw material, contact conditions such as a contact temperature and a contact time have to be changed frequently, depending on the absorption rate of pulps currently processed, thereby causing a problem of reduced productivity. For solving the problem, provided is a method for producing alkali cellulose, comprising at least the steps of: bringing two or more types of pulps having different alkali metal hydroxide solution absorption rates into contact with an alkali metal hydroxide solution to obtain a contact product; and draining the contact product, wherein the highest absorption rate is not more than 4.0 times as fast as the lowest absorption rate.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing cellulose ether, comprising at least the steps of: bringing two or more types of pulps having different alkali metal hydroxide solution absorption rates into contact with a 23 to 60% by weight alkali metal hydroxide solution to obtain a contact product; and draining the contact product to obtain alkali cellulose; and reacting the alkali cellulose with an etherifying agent; wherein the alkali metal hydroxide solution absorption rates of the two or more types of pulps are measured before the step of bringing two or more types of pulps into contact with the alkali metal hydroxide solution, and the two or more types of pulps are combined so that the highest absorption rate is not more than 4.0 times as fast as the lowest absorption rate. 2. The method for producing cellulose ether according to claim 1 , wherein the pulps are in chip form, and the method further comprises the steps of layering two or more sheets of pulps having the different alkali metal hydroxide solution absorption rates and cutting them together to form the pulps in chip form before the step of bringing two or more types of pulps into contact with an alkali metal hydroxide solution.
Assignees
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Classifications
Preparation of cellulose ethers {(rendering cellulose suitable for etherification C08B1/06)} · CPC title
Mixed ethers, i.e. ethers with two or more different etherifying groups · CPC title
- C08B1/08Primary
Alkali cellulose · CPC title
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- What does patent US9580516B2 cover?
- When a combination of pulps having different alkali metal hydroxide solution absorption rates is as a raw material, contact conditions such as a contact temperature and a contact time have to be changed frequently, depending on the absorption rate of pulps currently processed, thereby causing a problem of reduced productivity. For solving the problem, provided is a method for producing alkali c…
- Who is the assignee on this patent?
- Narita Mitsuo, Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C08B1/08. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 28 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).