Process for the production of water-adsorbing but water-insolubl

Details Process for the production of water-adsorbing but water-insolubl Process for the production of water-adsorbing but water-insolubl

1974-11-18

1976-06-22

Griffin, Ronald W.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 17A, 260231CM, C08B 1100, C08B 1120, C08B 11193, C08B 1510

Patent

active

039650910

ABSTRACT:
This invention relates to an improvement in the process for the production of water-adsorbing, but largely water-insoluble, cellulose ethers, in which cellulose is alkalized in the presence of alkali and isopropanol as a reaction medium and is so reacted with an etherification agent that by etherification only a water-soluble cellulose ether is produced, and in which process a modification agent which is able to react with the still free hydroxyl groups of the cellulose anhydro glucose groups in an alkaline reaction medium is reacted before, during, or after the etherification, the improvement comprising effecting the etherification of cellulose to carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, or methylhydroxyethyl cellulose, reacting with the modification agent in the presence of 0.8 to 7.5 parts by weight of isopropanol, based upon the cellulose weight, and employing a modification agent being one of the formulae ##EQU1## R.sub.1 in formula I being hydroxyl, or an acylamino or etherified carbamino group, and R.sub.2 in formula I being hydrogen or a carboxyl group.

REFERENCES:
patent: 2517577 (1950-08-01), Klug et al.
patent: 2886474 (1959-05-01), Kine et al.
patent: 3029232 (1962-04-01), Bikales et al.
patent: 3102773 (1963-09-01), Needleman
patent: 3125406 (1964-03-01), Herman
patent: 3298979 (1967-01-01), Hagemeyer et al.
patent: 3423163 (1969-01-01), Magat et al.
patent: 3696092 (1972-10-01), Tesoro

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