Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1994-03-24
1996-09-03
Bos, Steven
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428632, 428675, 428674, C03C 2700, B32B 1520
Patent
active
055522343
ABSTRACT:
A copper foil for printed circuits including a thermal oxidation-resistant treated layer (e.g., Zn--Ni or Zn--Co alloy plating) formed on the shiny side of the foil and a Cr-base anticorrosive treated layer (e.g., chromate film, mixed film of chromium oxide and zinc and/or zinc oxide, or both) formed further thereon, characterized in that a copper plating layer or an etched surface is provided before forming the thermal oxidation resistant treated layer. The copper plating or etching permits the shiny side to be completely covered with fresh copper or purified to overcome any ununiformity of the chemical activity and/or any lack of smoothness of the entire surface of the shiny side. The evenness of the freshly formed copper surface enhances the homogeneity and completeness of the thermal oxidation-resistant plated layer to be formed subsequently by thermal oxidation resistance treatment, rendering it possible to take the full advantage of the thermal oxidation-resistant treated layer. Thus a surface treatment technique of imparting a thermal oxidation resistance upon heating at 300.degree. C. for 30 minutes to the shiny side of copper foil has now been successfully developed for the first time in the art.
REFERENCES:
patent: 4386139 (1983-05-01), Nakatsugawa
patent: 4572768 (1986-02-01), Wolski et al.
patent: 5057193 (1991-10-01), Lin et al.
patent: 5061550 (1991-10-01), Shimizu et al.
patent: 5262247 (1993-11-01), Kajiwara et al.
patent: 5338619 (1994-08-01), Fukuda et al.
patent: 5389446 (1995-02-01), Yamanishi et al.
Patent Abstracts of Japan, vol. 5, No. 156 (C-074) 6 Oct. 1981 & JP-A-56-087-677 (Nippon Mining Co) 16 Jul. 1981.
Bos Steven
Japan Energy Corporation
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