Process of preparing delayed-dissolution cellulose ethers

Details Process of preparing delayed-dissolution cellulose ethers Process of preparing delayed-dissolution cellulose ethers

2006-03-14

2006-03-14

Wilson, James O. (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S056000, C536S057000, C536S124000, C536S084000, C514S338000, C510S446000, C424S451000

Reexamination Certificate

active

07012139

ABSTRACT:
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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