Process for preparing polyimide film

CAFC
  • US 6,746,639 B2
  • Filed: 09/11/2001
  • Issued: 06/08/2004
  • Est. Priority Date: 09/11/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for preparing a polyimide film by extruding and casting a composition of a resin solution containing a poly(amic acid) varnish, comprising:

  • preparing the poly(amic acid) varnish having low viscosity by polymerizing a tetracarboxylic dianhydride component with a diamine component in a molar ratio of 1;

    1.01 to 1;

    1.05 or 1;

    0.95 to 1;

    0.99, and preparing the composition of the resin solution by adding to the poly(amic acid) varnish a dehydrating agent in an amount of at least one mole and a chemically-imidizing catalyst in an amount of at least 0.5 mole per 1 mole of amic acid of the poly(amic acid) varnish.

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