Patent ID: 7005515
Filing Date: 2006-02-28
Classification: C08B

Abstract:
1. A process for preparing an alkyl hydroxyalkyl cellulose ether comprising the steps of: a) alkalizing cellulose to obtain alkali cellulose, b) reacting alkali cellulose with an alkyl halogenide until an alkyl cellulose ether with a D.S.(alkyl) value of from 0.7 to 2.5 is attained, c) removing excess alkyl halogenide from the reaction mixture, and d) reacting the alkyl cellulose ether with an alkylene oxide in a liquid suspending agent to produce an alkyl hydroxyalkyl cellulose ether, wherein the weight ratio between the alkylene oxide and the liquid suspending agent is from 0.001:1 to 1:1 and the liquid suspending agent is a blend comprising from 10 to 90 weight percent of an alcohol and from 90 to 10 weight percent of an aromatic or aliphatic hydrocarbon.