Delayed-dissolution cellulose ethers and a process for...

Details Delayed-dissolution cellulose ethers and a process for... Delayed-dissolution cellulose ethers and a process for...

C - Chemistry, Metallurgy

08

B

C08B 11/00 (2006.01) C08B 11/20 (2006.01) C08B 15/00 (2006.01) C08L 1/26 (2006.01) C08L 1/28 (2006.01) C09J 101/26 (2006.01) C09J 101/28 (2006.01)

Patent

CA 2412953

A process for preparing cellulose ethers having delayed dissolution in water is described. The process comprises: (a) treating a moist cellulose ether with a solution comprising a dialdehyde; (b) adding an aqueous salt solution to the moist cellulose ether, such that said cellulose ether has a pH of from 6.0 to 8.0, the aqueous salt addition being performed at least one of, (i) prior to step (a), (ii) concurrently with step (a), and (iii) subsequent to step (a); and (c) drying and comminuting the treated cellulose ether of step (b). The cellulose ether, or mixtures of cellulose ethers, prepared by the method of the present invention may be used as protective colloids, thickeners and adhesives.

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