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US 5,077,084 AGranted
Process for producing a flexible printed base
AssigneeChisso Corporation
InventorsShiro Konotsune, Atsushi Takahashi, Shouichi Fukunaga, Kazutsune Kikuta
Life of this patent
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Abstract
In a process for producing a flexible printed base by directly coating a copper foil with a polyimide precursor, followed by heating, drying and curing, a process affording a flexible printed base having a superior folding endurance and a good heat resistance at a cheap cost is provided, which process comprises carrying out the curing in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at 200.degree. and 450.degree. C.
Claims3
A process for producing a flexible printed base which comprises the steps of
- (a) directly coating a copper foil with a polyimide precursor, and
- (b) subjecting said coated copper foil to heating, drying and curing, the curing being carried out in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at a temperature of 200.degree. C. to 450.degree. C.
Dependencies are inferred from the claim text.