Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1983-12-01
1984-09-04
Powell, William A.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
29846, 29874, 156630, 156644, 156655, 1566591, 156902, 427 96, 427 98, 430313, B05D 512, H05K 300, B44C 122, C03C 1500
Patent
active
044697775
ABSTRACT:
A process for preparing a two layer printed circuit having conductive interconnections wherein at least one layer of a photoadhesive composition is applied to a substrate bearing an electrically conductive circuit pattern and exposing said photoadhesive layer or layers through a circuit image of three different optical densities, i.e., zero, gray and opaque, removing portions of the photosensitive layer by solvent washout, applying finely divided metal, alloy or plating catalyst to adherent image areas, optionally curing the printed circuit, e.g., heating or ultraviolet exposure and plating to form an interconnected electrically conductive circuit pattern. Multilayer printed circuits can also be prepared by repeating the steps using additional layers of photoadhesive material.
REFERENCES:
patent: 3350498 (1967-10-01), Leeds
patent: 3436468 (1969-04-01), Haberecht
patent: 3965277 (1976-06-01), Guditz et al.
patent: 4413051 (1983-11-01), Thomas
E. I. Du Pont de Nemours and Company
Powell William A.
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