Process for producing a flexible printed base

Details Process for producing a flexible printed base Process for producing a flexible printed base

1990-02-01

1991-12-31

Lusignan, Michael

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427377, 427379, 4273881, 29DIG42, B05D 512

Patent

active

050770845

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.

REFERENCES:
patent: 3894330 (1975-07-01), Bellis
patent: 4215157 (1980-07-01), Boldebuck et al.
patent: 4226913 (1980-10-01), Henderson
patent: 4267232 (1981-05-01), Schmidt et al.
patent: 4427716 (1984-01-01), Siwek
patent: 4522880 (1985-06-01), Klostermier et al.
patent: 4576857 (1986-03-01), Gannett et al.
patent: 4623563 (1986-11-01), Noda et al.
patent: 4839232 (1989-06-01), Morita et al.

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