COPPER-CORE COPPER-LINED LAMINATE AND COPPER CORE PRINTED BOARD

摘要

PROBLEM TO BE SOLVED: To secure enough adhesion between a copper or copper alloy core and a synthetic resin insulating layer in a laminated press molding by stacking a copper foil through a synthetic resin insulating layer on a copper plate or a copper alloy plate where a treatment film is made by electrolytic chromic acid treatment. ;SOLUTION: Part of lead electrodes 4 and 4 are mostly soaked in an electrolyte, with their tops exposed to air, and the copper core 1a is sunk in the electrolyte 3, being electrically connected to the lead electrode 5 in condition that it is hung from the lead electrode 5. The lead electrodes 4 and 4 work as anodes and a lead electrode 5 works as a cathode, and DC 5-20 VC is applied between the lead electrodes 4 and 4 and 5. Then, as a chromic acid film by electrolytic chromic acid treatment, a black film having enough film strength, which is obtained by properly setting the various conditions such as treatment time, current density, etc., is suitable. Thermosetting resin such as epoxy resin, polyimide resin, or the like is laminated by press at a temperature of 160-400°C and a pressure of 20-80 kg/cm²de, using the copper core treated in electrolytic chromic acid.;COPYRIGHT: (C)1999,JPO