Patent EP0879827A2 successfully refreshed from Google Patents.
EP0879827A2
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EP
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Method for preparing alkali carboxymethyl cellulose
Assignee: Metsa Specialty Chemicals Oy
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Filing: 1998-05-22
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Granted: —
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Expires: 2018-05-22
Abstract
Abstract The invention is related to a method for preparing carboxymethyl cellulose (CMC), comprising steps where the cellulose is ground, moistened with a reaction medium, mercerized with an aqueous solution of NaOH, treated with monochloroacetic acid, and optionally neutralized with acid, whereby a mixture of ethanol and isopropanol (EtOH/IPA) is used.
Inventors
- 👤 Paavo Mansikkamäki
- 👤 Oliver Ruppert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:05
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A method for preparing carboxymethyl cellulose (CMC), comprising steps
where the cellulose is ground, moistened with a reaction medium, mercerized with
an aqueous solution of NaOH, treated with monochloroacetic acid, and optionally
neutralized with acid, characterized in that a mixture of ethanol and isopropanol
(EtOH/IPA) is used as the reaction medium.
Claim 2
Dependent Claim
22 words
A method according to Claim 1, characterized in that the weight ratio of
EtOH/IPA is (10% - 90%) / (90% - 10%).
Claim 3
Dependent Claim
21 words
A method according to Claim 2, characterized in that the EtOH/IPA ratio is
preferably (30% - 70%) / (70% - 30%).
Claim 4
Independent Claim
27 words
A method according to any of the preceding Claims, characterized in that,
during mercerization, the water content of the EtOH/IPA mixture is in the range of
10-20%.
References Cited (Backward Citations)
No citation records indexed.
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