Patent ID: 6194076
Filing Date: 2001-02-27
Classification: B32B,C23C,H05K,Y10T

Abstract:
A copper-coated polyimide product comprising;a polyimide substrate having a substantially smooth surface; anda copper film attached to the substrate surface; wherein a portion of the copper atoms in the copper film are chemically bonded to functional groups of the polyimide at the surface;said copper being attached to the polyimide surface by the steps of:(a) exposing at least one surface of the polyimide substrate to a reactive gas plasma that provides a level of ion bombardment of at least 5.times.10.sup.17 eV/liter-atm, wherein the level of ion bombardment is represented by the expression: (q).times.(n.sub.+).times.(.phi..sub.f)/p; whereq=the unit electronic charge (equal to 1 for units of eV/liter-atm);n.sub.+ =the number density of positive ions in the plasma (liter.sup.-1);(.phi..sub.f)=the potential difference between the plasma and the polyimide surface (volts); andp=pressure in atmospheres; and(b) then depositing a copper film onto the ion-bombarded surface without intervening exposure to air.