Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1991-05-02
1993-03-16
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264203, 2642108, D01F 600
Patent
active
051942100
ABSTRACT:
Fibers of an alternating carbon monoxide-ethylene polymer having a molecular weight of at least 100,000 g/mole and a birefringence of at least 650.times.10.sup.-4 can be formed by first extruding a solution of the polymer in a mixed solvent system comprising an aromatic alcohol which is free of alkyl substituents on the aromatic nucleus and another solvent which is a liquid and is other than an aromatic alcohol. The extrusion into the solvent is at an extrusion rate of at least 1 m/min and forms a solvent-containing article which is then cooled or coagulated in a non-solvent for the polymer. The solvent is removed by extraction with a non-solvent for the polymer which is soluble in the mixture of solvents and the resulting article is drawn at a temperature of at least 180.degree. C.
REFERENCES:
patent: 5064580 (1991-11-01), Beck et al.
Band Elliot I.
Krins Bastiaan
Lommerts Bert J.
Piotrowski Andrzej M.
Smook Jan
Akzo NV
Fennelly Richard P.
Morris Louis A.
Tentoni Leo B.
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