Method for preparing low-substituted cellulose ethers

Details Method for preparing low-substituted cellulose ethers Method for preparing low-substituted cellulose ethers

1975-11-26

1978-05-23

Trousof, Natalie

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

Organic compounds

Carbohydrates or derivatives

536 84, 536 86, 536 91, 536 95, 536 96, 536 98, 536 99, 536100, 424362, C08B 1120, C08B 11193, C08B 1108, C08B 1112, C08B 1102, A61K 3172

Patent

active

040912051

ABSTRACT:
In the process for the preparation of low-substituted cellulose ethers comprising the successive steps of etherification of alkali cellulose, neutralization of the crude cellulose ether, washing, drying and pulverization, the neutralization step is carried out in two stages, i.e., by first employing 5 to 80% of an acid stoichiometrically required and then adding an additional amount of the acid to complete neutralization. The cellulose ethers thus prepared can readily be pulverized into fine powder having a very good flowing property and yet an excellent binding force, and work as a suitable disintegrator in tablets.

REFERENCES:
patent: 1448091 (1923-03-01), Seel
patent: 1510735 (1924-10-01), Baybutt
patent: 3251824 (1966-05-01), Battista
patent: 3451998 (1969-06-01), Alexander et al.
patent: 3527751 (1970-09-01), Gill
Rodd, E. H. "Chem. of Carbon Cpds.", vol. I, Part B, Elsevier Publ. Co., N.Y. 1952, p. 1308.

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