Process for producing a shaped and drawn aromatic imide polymer

Details Process for producing a shaped and drawn aromatic imide polymer Process for producing a shaped and drawn aromatic imide polymer

1988-05-24

1989-09-26

Lorin, Hubert

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264205, 2642101, 2642108, 26421117, 2642112, 264234, 264236, 264345, 264347, D01F 674

Patent

active

048698610

ABSTRACT:
A shaped and drawn aromatic imide polymer article, for example, a film or filament, is produced by shaping an aromatic polyamic acid solution containing an imidizing agent in a polar organic solvent while simultaneously imidizing a portion of the aromatic polyamic acid to an extent such that the resultant self-supporting precursory article contains 20% to 87% by weight of a volatile substance and has a tensile strength of at least 1.5 kg/mm.sup.2 and an ultimate elongation of at least 30%, by drawing the precursory article at a draw ratio of 1.3 or more and by heat-treating the drawn article at a temperature of 150.degree. C. or more.

REFERENCES:
patent: 4378324 (1983-03-01), Makino et al.
patent: 4568715 (1986-02-01), Itatani et al.
patent: 4725484 (1988-02-01), Kumagawa et al.

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