Printed circuits mfr by electroless metal-deposn - of conductors on insulating substrate whose surface is pre-treated by corona discharge

摘要

A printed circuit is mfd. by electroless metal deposition of the conductor lines on a pre-treated insulated substrate whose surface has been treated, before the metallising step, by corona discharge. Adhesion of metal conductor lines to substrate is considerably improved. The claimed process is simpler than prior-art methods using a surface-oxidising agent e.g. chromic acid for the pre-treatment of the substrate. The homogeneity of the surface is not affected. The insulating substrate may be coated with a hardenable synthetic resin. Polyurethane is a suitable resin.