Biaxially stretched isotropic polyimide film having specific pro

Details Biaxially stretched isotropic polyimide film having specific pro Biaxially stretched isotropic polyimide film having specific pro

1992-02-26

1995-10-24

Nakarani, D. S.

Stock material or miscellaneous articles

Composite

Of metal

4284735, B32B 1508

Patent

active

054608902

ABSTRACT:
An isotropic, biaxially stretched polyimide film prepared by casting a solution of a polyamic acid precursor in an organic solvent containing a cyclization catalyst and dehydrating agent onto the surface of a support, imidizing the polyamic acid to give a continuous self-supporting gel film containing 5-50% by weight of solids, stretching the gel film in the machine direction (MD) at a ratio of 1.1-1.9, and stretching in the transverse direction (TD) with respect to the machine direction so as to maintain a TD/MD stretch ratio of from 0.9 to 1.3.

REFERENCES:
patent: 4496794 (1985-01-01), Darms et al.
patent: 4522880 (1985-06-01), Klostermeier et al.
patent: 4675246 (1987-06-01), Kundinger et al.
patent: 4725484 (1988-02-01), Kumagawa et al.
patent: 4869861 (1989-09-01), Inoue et al.
patent: 4937133 (1990-06-01), Watanabe et al.
patent: 5137762 (1992-08-01), Aizawa et al.

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