Process for the production of water-insoluble fibers of cellulos

Details Process for the production of water-insoluble fibers of cellulos Process for the production of water-insoluble fibers of cellulos

1986-03-03

1988-03-29

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

1061631, 106169, 106198, 536 63, 26421116, D01F 202

Patent

active

047342390

ABSTRACT:
Water-insoluble fibers of cellulose monoester of maleic acid, succinic acid, or phthalic acid having an extremely high absorption ability for water and physiological liquids are produced by (a) preparing at 20.degree. to 80.degree. C. a solution of activated cellulose in dimethylacetamide or 1-methyl-2-pyrrolidon containing 5 to 30% by weight activated cellulose of an average degree of polymerization from 300 to 800 and 3 to 20% by weight LiCl, (b) reacting the solution with a corresponding carboxylic acid anhydride in a mol ratio from 1:0.20 to 1:4 at 20.degree. to 120.degree. C. in the presence of known esterification catalyst until a degree of esterification from 0.1 to 1.7, (c) wet-spinning the cellulose monoester solution into a coagulation agent, with or without (d) converting the fibers of cellulose monoester of phthalic acid and, if necessary, the of cellulose monoester of maleic acid or succinic acid, in a substantially organic solvent by means of reaction with alkali metal hydroxide, alkali metal alcoholate, ammonia, primary or secondary amines, partially or completely into fiber-shaped salts.

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patent: 2853485 (1958-09-01), Werner et al.
patent: 3671184 (1972-06-01), Cuculo
patent: 4059457 (1977-11-01), Austin
patent: 4278790 (1981-07-01), McCormick
patent: 4302252 (1981-11-01), Turbak et al.

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