Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1977-07-14
1978-12-12
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
106163R, 106168, 264188, C08L 124
Patent
active
041296400
ABSTRACT:
A process for producing shaped articles of cellulose is disclosed, wherein the process includes steps of contacting a shaped solution of cellulose in DMSO and formaldehyde, containing at least 6% by weight of cellulose based on the volume of DMSO, and containing formaldehyde in a weight ratio of formaldehyde/cellulose of about 0.2 to about 0.6, with a coagulating solution of DMSO and water at a temperature no greater than 10.degree. C. The coagulant bath generally contains 30 to 50% by weight of DMSO, and the solutions are readily coagulated at coagulation speeds appropriate for commercial practice, and generally the coagulation occurs in less than 20 seconds.
The products produced by the present process are shaped articles such as filaments, fibers, films, sheets and membranes, and especially filaments which are suitable for use in the textile field.
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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