Process for producing cellulosic mouldings

Details Process for producing cellulosic mouldings Process for producing cellulosic mouldings

1998-11-16

2000-08-22

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264102, 264187, 2642095, 26421114, B29C 5528, D01F 200

Patent

active

061067636

ABSTRACT:
Process for producing cellulosic moldings such as fibers, foils, casings and beads from cellulose, wherein (a) the initial cellulose is hydrothermally treated with water in a water/cellulose ratio on a weight basis of at least 1 at a temperature in the range from about 100.degree. to about 200.degree. C. and under a pressure in the range from 0.1 to about 1.5 MPa; (b) the treated cellulose is dissolved in an aqueous solution of alkali hydroxide at a temperature of at least 0.degree. C. to form a homogenous cellulose solution containing from about 5% to about 10% by weight cellulose and at maximum 10% by weight alkali hydroxide, and (c) the alkaline cellulose solution is formed and coagulated by contacting it with an aqueous solution containing 1 to about 30% by weight of an acid. This fully ecological process avoids handling of toxic products or by-products and uses aqueous solvents instead of expensive organic solvents. The cellulose solution is stable for at least 48 hours.

REFERENCES:
patent: 4634470 (1987-01-01), Kamide et al.
patent: 5401447 (1995-03-01), Matsui et al.
Yamashiki, Takashi et al., Some Characteristic Features of Dilute Aqueous Alkali Solutions of Specific Alkali Concentration (2.5 moll-1) Which Possess Maximum Solubility Power Against Cellulose, Polymer Journal, vol. 20, No. 6, pp. 447-457 (1988).
Yamashiki, T. et al., Cellulose Fiber Spun From Gelatinized Cellulose/Aqueous Sodium Hydroxide System by the Wet-Spinning Method, Cellulose Chem. Technol., 24, pp. 237-249 (1990).

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