Process for producing a crosslinked cellulose ether

[0075] Example

[0076] The present invention will be described in detail in detail below, but will not be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0077] The various terms and naming explanations used in the invention example (Inv.Ex.) and comparative example (Comp.Ex.) are as follows:

[0078] "HEMC" represents hydroxyethylcellulose.

[0079] "AGU" represents a dehydrated glucose unit of cellulose ether.

[0080] "LVN" represents the limit viscosity of the pulp measured as described in the program described in ISO 5351 (2010).

[0081] The various raw materials or ingredients used in the examples are as follows:

[0082] Epilox M 985 is a poly (propanediol) dihydrate glycene ether available from Leuna Harze.

[0083] Examples of the method used in the present invention and crosslinked compounds based on dihydrophil ether are described in Eugenew.jones, "Crosslinking of Cotton Cellulose withdiglycidyl ether

[0089] Examples 1 and 2 and comparative example A-C

[0090] Typically, HEMC is produced in principle based on Williamson ether. After 50% caustic sodium activated, alkalized cellulose is produced. Then the etherification of MCl and EO. For example, useful guidelines of this method are found in R.Donges, "Non-Ionic Cellulose ethers" "," British Polymer Journal "Volume 23, 315- Page 326 (1990). The crosslinked compound used in the process of the present invention is based on a dihydrate glycidyl ether; and an overview of the characteristics of the crosslinking agent used in the examples are described in Table II.

[0091] The limit viscosity (LVN) of the pulp is measured according to the program described in ISO 5351 (2010). The grinding cellulosesis (400 mol; LVN is greater than or equal to (≥) 1,450 ml / grams [ml / g]) is added to a 1,000 liter (L) autoclave (reactor).

[0092] Use n 2 After purging the autoclave three times, heated the autoclave to 40 ° C. Then, dimethyl ethe