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

1976-05-06

1978-01-10

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

128296, 260 17A, 536 84, 536 88, C08B 1100, C08B 1120, C08B 11193, C08B 1510

Patent

active

040680673

ABSTRACT:
This invention relates to an improvement in the process for the production of water-adsorbing, 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 carboxymethyl 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 reactive with the still free hydroxyl groups of the cellulose anhydro glucose groups, said modification agent having one of the formulae ##STR1## in which R.sub.1 is hydroxyl, an acylamino or esterified carbamino group, and
R.sub.2 is hydrogen or a carboxyl group,
The improvement comprising effecting alkalization, etherification, and modification in a liquid reaction medium other than isopropyl alcohol.

REFERENCES:
patent: 1884629 (1932-10-01), Dreyfus
patent: 2517577 (1950-08-01), Klug et al.
patent: 2667480 (1954-01-01), Branon et al.
patent: 3069409 (1962-12-01), Henry et al.
patent: 3085087 (1963-04-01), Henry et al.
patent: 3589364 (1971-06-01), Dean et al.
patent: 3936441 (1976-02-01), Holst et al.
patent: 3965091 (1976-06-01), Holst et al.
"The New Cellulose Solvent: Dimethyl Sulfoxide-Paraformaldehyde," Johnson et al., 39th Executive Conference, the Institute of Paper Chemistry, Appleton, Wisconsin, May 8, 1975, pp. 78-80, 82 and 83.

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