Aromatic polyimide film and polyimide/copper foil composite shee

Details Aromatic polyimide film and polyimide/copper foil composite shee Aromatic polyimide film and polyimide/copper foil composite shee

1996-10-03

1998-12-15

Krynski, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428457, 4284735, 428901, 528188, 528353, B32B 300

Patent

active

058493972

ABSTRACT:
An aromatic polyimide film in the form of a continuous tape having a thickness of 50 to 125 .mu.m favorably employed for manufacture of electric circuit is composed of a biphenyltetracarboxylic acid recurring unit and a p-phenylenediamine recurring unit. The polyimide film has the following characteristics: a tensile strength of not lower than 30 kg/mm.sup.2 ; a tensile modules of not lower than 500 kg/mm.sup.2 ; a linear expansion coefficient of not higher than 2.5.times.10.sup.-5 cm/cm/.degree.C.; a heat shrinkage ratio of not higher than 0.05%; a low curling having a maximum curling of not higher than 3 mm for a disk of diameter of 86 mm; and a uniform thickness having a maximum rate of inclination of not more than 3 .mu.m per 10 mm.

REFERENCES:
patent: 4690999 (1987-09-01), Numata et al.
patent: 4792476 (1988-12-01), Numata et al.
patent: 4937133 (1990-06-01), Watanabe et al.
patent: 5374469 (1994-12-01), Hino et al.

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