Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1989-08-21
1990-11-20
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264184, 2642104, 2642106, 26421118, 26421119, 264212, 264216, 264236, 264347, B29C 7100
Patent
active
049717448
ABSTRACT:
A process for preparing aromatic polyamide film wherein an aromatic diamine and an aromatic diacidchloride are dissolved in an amide polymerization solvent containing an inorganic salt, a partial polymerization is effected at a low temperature to form an optically anisotropic liquid crystalline prepolymer dope, continuously extruding through a film die under a draw ratio or subjecting to a shear and contacting the prepolymer with a second solvent which is a polymerization accelerating-precipitation solvent to obtain an aromatic polyamide film free of crystal defect layer perpendicular to the film axis and having high strength and a high degree of molecular orientation.
REFERENCES:
patent: 4511623 (1985-04-01), Yoon et al.
Journal of Polymer Science; Polymer Physics Edition, vol. 21, 1955-1969 (1983).
Journal of Polymer Science: Polymer Physics Edition, vol. 21, 1957-1983 (1983).
Han Ink S.
Kim Du H.
Kim Hak M.
Kim Sang H.
Kim Si M.
Kolon Industries Inc.
Lorin Hubert C.
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