Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1999-01-12
2000-08-22
Rosasco, S.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430318, G03C 500
Patent
active
061070033
ABSTRACT:
An alkaline refractory metal which is insoluble in alkaline etching solutions, is electrodeposited on the surface of copper foil, then a thermosetting resin is applied to the surface and semi-cured to obtain a coated copper foil. The coated copper foil is bonded to one or both faces of an inner layer board having wirings on one or both of its faces. Then, the copper foil on a surface of this laminate is removed by alkaline etching, while selectively leaving the alkaline refractory metal layer. A laser beam is used to form via holes in both the alkaline refractory metal layer and the thermosetting resin layer simultaneously. With the above method, via holes of the multi-layered printed wiring board can be easily formed using a laser, and adhesion between the outer wirings made from the plated copper and the insulating resin is improved.
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"CO2 Laser Drilling Technology for Glass Fabrics Base Copper Clad Laminate," Morio, Gaku, Hidenori Kimbara, Nobuyuki Ikeguchi, Yoshihiro Kato, Mitsubishi Gas Chemical Company, Inc., Tokyo, Japan; from brochure Proceedings of the Technical Conference Expo '98, 4 pgs; 1998.
Mitsui Mining & Smelting Co. Ltd.
Rosasco S.
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