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

1974-11-11

1976-02-03

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

039364410

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 hydroxide 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 the cellulose is reacted with a cross-linking agent which is polyfunctional towards cellulose in an alkaline reaction medium before, during, or after the etherification of the cellulose, the improvement comprising effecting the etherification of cellulose to carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, or methylhydroxyethyl cellulose, reacting the cellulose with the polyfunctional cross-linking agent in the presence of 0.8 to 7.5 parts by weight of isopropanol, based upon the cellulose weight, and employing as the cross-linking agent acrylamido methylene chloroacetamide, dichloroacetic acid or phosphorus oxychloride or a compound in which at least two groups functional towards cellulose are

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.

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