EP0539979A2
Expired / Lapsed
EP
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Process for producing mixed cellulose ether
Assignee: Daicel Corp
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Filing: 1992-10-29
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Granted: —
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Expires: 2012-10-29
Abstract
Abstract A process for producing a mixed cellulose ether comprising reacting a starting cellulose ether with an etherifying agent is disclosed, wherein said starting cellulose ether comprises at least 18 mol% of a 6-substituted glucose unit and at least 15 mol% of an unsubstituted glucose unit. A high utilization of the etherfifying agent can be reached. The resulting mixed cellulose ether has a high solubility in water and an aqueous solution of the resulting mixed cellulose ether has excellent properties such as flow properties and clarity.
Inventors
- 👤 Atsunobu Kiyose
- 👤 Yonosuke Dairy Farm Road No.01-01 Kato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:46
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193; C08B11/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A process for producing a mixed cellulose ether comprising reacting a starting cellulose ether containing a first substituent with an etherifying agent either successively or continuously, wherein said starting cellulose ether comprises at least 18 mol% of a 6-substituted glucose unit and at least 15 mol% of an unsubstituted glucose unit.
Claim 2
Dependent Claim
40 words
A process for producing a mixed cellulose ether as claimed in Claim 1, wherein said starting cellulose ether comprises from 18 to 50 mol% of a 6-substituted glucose unit and from 15 to 40 mol% of an unsubstituted glucose unit.
Claim 3
Dependent Claim
16 words
A process as claimed in Claim 1, wherein said starting cellulose ether is a hydroxyalkyl cellulose.
Claim 4
Dependent Claim
60 words
A process as claimed in Claim 1, wherein said starting cellulose ether is a cellulose ether prepared by mercerization of cellulose in an aqueous phase having an alkali concentration of 25 to 50% by weight for 30 minutes to 4 hours followed by etherification at a temperature of 50°C or higher for a period of not more than 150 minutes.
Claim 5
Dependent Claim
19 words
A process as claimed in Claim 4, wherein said mercerization is carried out for 30 minutes to 2 hours.
Claim 6
Dependent Claim
30 words
A process as claimed in Claim 1, wherein said reacting is carried out in the presence of not more than 0.5 mol of an alkali per mol of glucose unit.
References Cited (Backward Citations)
No citation records indexed.
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