Method for the production of easily wetted, water-soluble, powdered at least alkylated non-ionic cellulose ethers
AssigneeSE Tylose GmbH & Co. KG
InventorsAlf Hammes, Reinhard Doengers
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Abstract
The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterised in that at least one surfactant in solid, liquid or solution form is added to the cellulose for production of the cellulose ether.
Claims5
A process for preparing at least alkylated, nonionic cellulose ethers in which at least 10% of all hydroxyl groups are alkylated and which are coagulable in water in a temperature range of from 45 to 95° C., and are converted to the cellulose ether by
- a) activating the cellulose by alkalization in the presence of water, base and organic dispersing auxiliary,
- b) etherifying the activated cellulose in a one- or multistage process using an etherifying agent by a Williamson ether synthesis and
- c) purifying the product in a subsequent purification step by washing with water which has a temperature above the coagulation point of the cellulose ether to remove reaction by-products and salts,
- which comprises adding at least one surfactant in solid, liquid and/or dissolved form before the cellulose is converted to the cellulose ether.
Dependencies are inferred from the claim text.