Process for producing aromatic polyamide film

Details Process for producing aromatic polyamide film Process for producing aromatic polyamide film

1995-07-26

1997-08-19

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528335, 528336, 528348, 528349, 528488, 264165, 264178R, 264184, C08G 6926, C08G 7310

Patent

active

056590075

ABSTRACT:
A process for producing an aromatic polyamide film comprising forming a thin layer of an optically isotropic dope in which an aromatic polyamide is dissolved in a polar amide, immersing the thin layer dope in a polar solvent kept at a temperature not higher than -20.degree. C. to coagulate the dope to form a film and drying the film in the presence of an isocyanate compound. Said process can produce directly a transparent film from an aromatic polyamide dope without requiring the step of dissolving the aromatic polyamide in conc. sulfuric acid, does not require any acid resistant equipment and is inexpensive.

REFERENCES:
patent: 4368237 (1983-01-01), Yamada et al.
patent: 4529763 (1985-07-01), Tamura et al.
patent: 4708909 (1987-11-01), Ohtsuki et al.

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