Patent ID: 6808642
Filing Date: 2004-10-26
Classification: H01F,H01G,H05K,Y10T

Abstract:
A method for producing a multi-layer substrate, comprising the steps of: adhering a transfer film comprised of a resin film support layer having an adhesive layer comprised of a base polymer and a foaming agent thereon, the transfer film having an adhesive force ranging from 3.7 to 7.0 N/20 mm to an electrically conductive layer; patterning the conductor layer by etching to form a predetermined pattern; placing the transfer film overlaid with the patterned conductor layer on a prepreg such that the patterned conductor layer is in surface contact with a surface of the prepreg; and then compressing the combined layers and transfer film under a pressure of 4.9 to 39 Mpa while heating at 1300-1700 C; and peeling the transfer film from the conductor layer; thereby leaving the prepreg in contact with the conductor layer.