Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1985-03-27
1986-11-18
Smith, John D.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427 96, 4273881, 4273882, 428901, H05K 103
Patent
active
046235639
ABSTRACT:
A process for producing a polyimide/metallic foil composite film having a curvature radius of at least 25 cm and which is substantially free from curling is described, comprising coating a solution of a polyimide precursor in an organic polar solvent on a 1 to 500 .mu.m thick metallic foil, the polyimide precursor being prepared by reacting a diamine component comprising p-phenylenediamine and an aromatic tetracarboxylic acid component comprising 3,3',4,4'-biphenyltetracarboxylic dianhydride or its derivative; heat-drying the above-prepared coating in the state that the metallic foil is fixed; and then heating it at a high temperature to form a 5 to 200 .mu.m thick polyimide film. This composite film does not substantially curl in either the lengthwise and widthwise directions and is very suitable for use in the production of an electric circuit board.
REFERENCES:
patent: 3981847 (1976-09-01), Meyer
patent: 4411952 (1983-10-01), Sasaki
patent: 4440643 (1984-04-01), Makino
patent: 4470944 (1984-09-01), Asakura
patent: 4503285 (1985-03-01), Darms
patent: 4508766 (1985-04-01), Inaike
patent: 4522880 (1985-06-01), Klostermeier
Imai Masanori
Noda Yuzuru
Nitto Electric Industrial Co. Ltd.
Smith John D.
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