Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1995-06-06
1996-11-05
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
1061701, 10617044, 10617046, 26421115, 26421117, 264233, 264234, B29C 4700, D01D 1006, D01F 228
Patent
active
055714684
ABSTRACT:
A process for producing a fiber or film of regenerated cellulose from a composition having a base of cellulose formate is provided. The composition is characterized by the following: (1) the composition is a solution; (2) the concentration of cellulose formate in the composition is at least 8% by weight; (3) the degree of substitution of the cellulose by formate groups is greater than 20% and (4) the composition contains one or more compounds selected from among alkylsulfoxides, lactams, acrylic amides and cyclic derivatives of urea as a solvent. The process for producing the fiber or film involves (i) transforming the composition into a liquid extrudate having the form of a fiber or film at a temperature at which the solution is isotropic at rest; (ii) coagulating the liquid extrudate; (iii) regenerating the cellulose of the fiber or film obtained and (iv) washing and drying the regenerated cellulose fiber or film.
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Journal Of Polymer Science, Polymer Letters Edition, vol. 24, No. 10, 1986, New York, US, pp. 495-501--T. Fujimoto et al. "Reaction of Cellulose with Formic Acid and Stability of Cellulose Formate".
Angewandte Makromolekulare Chemie, vol. 198, No. 3451, 1992, Basel, Switzerland, pp. 155-164, M. Schnabelrauch et al., "Readily Hydrolyzable Cellulose Esters as Intermediates for the Regioselective Derivatization of Cellulose" *summary, conclusions*.
Cizek Vlastimil
Huston Rima
Meraldi Jean-Paul
Michelin Recherche ET Technique S.A.
Tentoni Leo B.
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