Process for the production of water-adsorbing cellulose ethers

Details Process for the production of water-adsorbing cellulose ethers Process for the production of water-adsorbing cellulose ethers

C - Chemistry, Metallurgy

08

B

260/217.1

C08B 11/00 (2006.01) A61L 15/28 (2006.01) C08B 11/193 (2006.01) C08B 15/00 (2006.01) C08B 15/10 (2006.01)

Patent

CA 1062254

PROCESS FOR THE PRODUCTION OF WATER-ADSORBING CELLULOSE ETHERS Abstract of the Disclosure This invention relates to an improvement in the process for the production of water-absorbing, but at least partially water-insoluble cellulose ethers in which cellulose is alkalized in a liquid reaction medium and etherified in a manner such that by etherification only an at least largely water-soluble carboxymethtyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose or methyl hydroxyethyl cellulose is produced, and in which the cellulose is reacted in an alkaline reaction medium before, during, or after the etherification with a modification agent reactlve with the still free hydroxyl groups of the cellulose anhydro glucose groups, said modification agent hav- ing one of the formulae I Image and II Image in which R1 is hydroxyl, an acylamino or esterified carbamino group, and R2 is hydrogen or a carboxyl group, the improvement comprising effecting alkalization, etherifica- tion and modification in a liquid reaction medium other than isopropyl alcohol.

251760

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