Poly-p-phenylene-terephthalamide film and process for producing

Details Poly-p-phenylene-terephthalamide film and process for producing Poly-p-phenylene-terephthalamide film and process for producing

1987-10-02

1989-08-15

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264 83, 264184, B29C 3942, B29C 1500

Patent

active

048572551

ABSTRACT:
There is presented a poly-p-phenylene-terephthalamide film which is excellent in transparency, sufficiently oriented not only in the MD direction but also in the TD direction of the film having strength, elongation, modulus and dimensional stability in both longitudinal and lateral directions, and is also excellent in flatness. The film can be produced by forming an optically anisotropic dope comprising a poly-p-phenyleneterephthalamide having an .eta.inh of 2.5 dl/g or higher and an inorganic strong acid type solvent into a film-shaped dope on a support surface, converting the dope into an optically isotropic dope by water absorption, coagulating the dope, then washing the coagulated product and drying while restricting it shrinkage.

REFERENCES:
patent: 3767756 (1973-10-01), Blades
patent: 3869429 (1975-03-01), Blades
patent: 3966686 (1986-06-01), Asakura et al.
Flory, P. J., "Phase Equilibria in Solutions of Rod-Like Particles", In J. American Chemical Society, pp. 73-89.
Flood, John E.; Jame L. White and John P. Fellers, "Process for the Formation of Biaxially Oriented Films of Poly(p-phenylene Terepathalamide) from Liquid Crystalline Solutions", In Journal of Applied Polymer Science, vol. 27, No. 8, pp. 2965-2985.

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