PROCESS OF PREPARATION OF COMBINED COPPER-POLYIMIDE SURFACE TO FORMATION OF COATING BY CHEMICAL CONVERSION Russian patent published in 1995 - IPC

FIELD: radio engineering. SUBSTANCE: process of formation of coating by chemical conversion of combined metal-dielectric surface consists in operations of etching, sensitization and activation during which additional treatment of surface in solution containing g/l: NaOH 200-400, ethylenediamine 70-80; monoethanoamine 60-70; trietanoamine 40-50 is conducted after etching operation at temperature 50-60 C and curing time 5-7 min. Activation of surface is performed in solution containing, g/l: PdCl₂·2H₂O 0.1-0.01; HCl 0.4-0.6; glycine 1.5-2.0 with pH 3.2-3.5 at temperature 20-26 C and curing time 9-10 min. EFFECT: reduced cost of process, improved working conditions, increased stability of activation solution to decomposition, enhanced output of good products. 2 tbl