Process for the preparation of viscose and process for the spinn

Details Process for the preparation of viscose and process for the spinn Process for the preparation of viscose and process for the spinn

1980-06-06

1983-01-11

Woo, Jay H.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106165, 264188, 536 60, 536 61, C08L 124

Patent

active

043680780

ABSTRACT:
A process for the xanthation of alkali-cellulose comprises the reaction of he alkali-cellulose with CS.sub.2 in excess with respect to the desired xanthate substitution degree at a pressure which increases from the initial 110 mm Hg to about 400-500 mm Hg and at a temperature increasing from about 21.degree. C. to about 23.degree.-25.degree. C. The unreacted CS.sub.2 is removed from the reactor, once the desired xanthate substitution degree is reached, by application of a vacuum. This viscose rayon continuous spinning process eliminates the need for the usual desulphuration phase for decreasing the sulphur content and for bleaching the product. The viscose obtained has reduced content of compounds capable of forming elementary sulphur. The regenerated cellulose yarn has improved characteristics as to the sulphur content and degree of whiteness.

REFERENCES:
patent: 2592355 (1952-04-01), Tachikawa
patent: 2629714 (1953-02-01), Robertson
patent: 3395140 (1968-07-01), Williams
patent: 3835113 (1974-09-01), Burke et al
patent: 4076934 (1978-02-01), Mills

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