FOILED POLYIMIDE PRODUCTION PROCESS Russian patent published in 1994 - IPC

FIELD: chemical industry. SUBSTANCE: polyimide film is heated and laminated at least on one side with copper foil by preliminary heating and pressing them together. The heating of the polyimide film with an adhesive layer on its surface is performed in four steps: the first step at a temperature of 35 ± 5^°C, the second step at 45 ± 5^°C, the third and fourth steps at 55 ± 5^°C, the speed of pulling the film being 4 to 6 m/min. After the heating the surfaces of the polyimide film with adhesive and of the copper foil to be joined are treated in vacuum by heavy accelerated ions of argon. Subsequently polyimide is laminated with 5+3-1

μm microns copper foil obtained by precipitation of vapors on aluminium protector in vacuum with preliminary heating of the vapors up to 120 ± 5^°C. Pressing is effected at a temperature of 110 ± 5^°C and at a pressure of 10,4 ± 0,05 MPa. This done, the aluminium protector and the foiled polyimide are separated in the air. EFFECT: production of foiled polyimide featuring high-strength engagement and having better operating characteristics. 1 cl, 1 tbl, 1 dwg