Two-stage process for preparing aromatic polyamide fiber

Details Two-stage process for preparing aromatic polyamide fiber Two-stage process for preparing aromatic polyamide fiber

1987-03-10

1989-10-24

Lorin, Hubert

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

264 13, 264141, 264561, 264180, 264181, 264184, 2642103, 2642104, 2642106, 2642108, 26421116, D01D 526, D01F 660

Patent

active

048760404

ABSTRACT:
A process for preparing aromatic polyamide fibers 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, and the liquid crystalline prepolymer dope is subjected to a molecular orientating polymerization in a polymerization accelerating-precipitation solvent to provide aromatic polyamide fibers free of a crystal defect layer perpendicular to the fiber axis and having high strength and 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).

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