Transparent poly-p-phenylene-terephthalamide film

Details Transparent poly-p-phenylene-terephthalamide film Transparent poly-p-phenylene-terephthalamide film

1986-04-03

1988-06-21

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

264212, 4284744, C08G 6946, C08G 6932

Patent

active

047526432

ABSTRACT:
There is presented a poly-p-phenyleneterephthalamide film which is excellent in transparency, sufficiently oriented not only in the MD direction but also in the TD direction of the film, having high 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: 3869429 (1975-03-01), Blades

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