Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1977-07-14
1979-11-06
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264188, C08L 124
Patent
active
041736133
ABSTRACT:
A process for producing shaped articles of cellulose is disclosed, wherein a solution of cellulose in dimethylsulphoxide (DMS0) and formaldehyde, at a formaldehyde/cellulose weight ratio of 0.2 to 2, and at a cellulose concentration of at least 6% by weight based on the volume of DMSO, is spun into a coagulant bath. The coagulant bath contains water, DMSO and ammonia or an ammonium salt, with the DMSO present in an amount of about 25 to 60 weight percent of the mixture of DMSO and water. The ammonia or ammonium salt is present in an amount, calculated as ammonia, of at least 1 gram per liter in the mixture of DMSO and water.
The use of the coagulant bath of the present invention permits the cellulosic solution to be formed into shaped articles, and especially into filaments which are useful in the textile field. Other shaped articles which can be made from the cellulosic solution include fibers, threads, membranes, films, and sheets.
REFERENCES:
patent: 3236669 (1966-02-01), Williams
patent: 3706526 (1972-12-01), Swidler et al.
patent: 4022631 (1977-05-01), Turbak et al.
patent: 4028132 (1977-06-01), Litt et al.
patent: 4044090 (1977-08-01), Portnoy
Rhone-Poulenc-Textile
Woo Jay H.
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