Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1990-10-03
1993-08-17
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430311, 430318, 430319, 430325, 430327, 430328, 430329, 430396, G03F 726, H05K 300
Patent
active
052368106
ABSTRACT:
An improved process for preparing a printed-circuit board, which successively comprises (I) a step of forming a positive photo-sensitive resist film onto a circuit board having a conductive film according to the electrodeposition coating process, (II) a step of irradiating a full dose of an actinic ray onto the positive photo-sensitive resist film through a photomask with which the actinic ray is cut off over a conductive circuit-forming area, (III) a step of developing the resulting resist film, (IV) a step of etching away a deposited copper-clad area, and (V) removing a remaining resist film on the conductive circuit-forming area, the improvement further comprising a step of imparting the resist film in the conductive circuit-forming area an increased alkali resistance prior to development so as to obtain the printed-circuit board having high resolution with good reproductivity without being affected by variations of the developing conditions.
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Hashimoto Sadaaki
Iwasawa Naozumi
Kondo Toshio
Onishi Shinsuke
Duda Kathleen
Kansai Paint Co. Ltd.
McCamish Marion E.
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