Process for preparing biaxially stretched isotropic polyimide fi

Details Process for preparing biaxially stretched isotropic polyimide fi Process for preparing biaxially stretched isotropic polyimide fi

1993-02-25

1994-06-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264571, 264204, 264216, 2642102, 2642893, 2642902, 264347, B29C 4124

Patent

active

053244753

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.

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