G - Physics – 03 – F
Patent
G - Physics
03
F
G03F 7/16 (2006.01) G03F 7/022 (2006.01) H05K 3/06 (2006.01)
Patent
CA 2059707
Abstract of the Disclosure Electrodeposition Method A method of producing a positive image on a substrate, which method comprises the steps of a) immersing a copper-clad laminate, as a cathode, in an electrolytic bath containing an electrodepositable, non-photosensitive polymer, and electrodepositing a film of the polymer on to the laminate; b) immersing the laminate, coated with the polymer in step a), as an anode or, preferably, as a cathode, in an electrolytic bath containing a naphthoquinone diazide sulphonamide of formula (I): Image I in which Ra and Rb, independently, are hydrogen, provided that Ra and Rb are not both hydrogen; C1-C8 alkylene substituted by an optionally substituted amino group; a phenyl group which is optionally substituted by an amino group; or Ra and Rb together form a 5- or 6- membered optionally substituted heterocyclic ring which either contains an amino-containing group within the ring, or has an amino-containing group substituted on the ring and electro depositing a film of the sulphonamide on to the polymer-coated laminate; c) irradiating the dried, coated laminate obtained in step b) through a mask; and d) developing the irradiated, coated laminate to produce a positive image of the mask.
Ag Ciba-Geigy
Fetherstonhaugh & Co.
Hatton Kevin B.
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