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US-2017333518-A1 · Nov 23, 2017 · US
Process for manufacturing lithium carboxymethyl cellulose
US9580517B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9580517-B2 |
| Application number | US-201414781322-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 28, 2014 |
| Priority date | Jun 4, 2013 |
| Publication date | Feb 28, 2017 |
| Grant date | Feb 28, 2017 |
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Abstract
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Prepare lithium carboxymethyl cellulose by treating sodium carboxymethyl cellulose with a weak acid to form an acid from of carboxymethyl cellulose and then treating the acid form of the carboxymethyl cellulose with lithium chloride.
First claim
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What is claimed is: 1. A process comprising the following steps: (a) treating sodium carboxymethyl cellulose with a weak acid to form an acid form of carboxymethyl cellulose; and (b) treating the acid form of carboxymethyl cellulose with lithium chloride to form lithium carboxymethyl cellulose. 2. The process of claim 1 , further characterized by the weak acid being selected from a group consisting of acetic acid, formic acid, hydrofluoric acid, nitrous acid, hydrocyanic acid and hydrogen sulfate ion. 3. The process of claim 1 , further characterized by the weak acid being acetic acid. 4. The process of claim 1 , further characterized by an absence of strong acid during the forming of carboxymethyl cellulose in step (a). 5. The process of claim 1 , further characterized by the treatments of step (a) and step (b) being done in an aqueous solution. 6. The process of claim 5 , further characterized by the aqueous solution comprising alcohol. 7. The process of claim 1 , further characterized by the sodium carboxymethyl cellulose having a degree of substitution in a range of 0.4 to 2.0.
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Frequently asked questions
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- What does patent US9580517B2 cover?
- Prepare lithium carboxymethyl cellulose by treating sodium carboxymethyl cellulose with a weak acid to form an acid from of carboxymethyl cellulose and then treating the acid form of the carboxymethyl cellulose with lithium chloride.
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification C08B11/12. 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).