C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22.5
C25D 3/04 (2006.01) B32B 15/08 (2006.01) C08G 8/04 (2006.01) C09D 163/00 (2006.01) C25D 5/26 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1177774
ABSTRACT OF THE DISCLOSURE The invention provides a treated steel sheet, a production process thereof and a retortable bonded can made of the sheet. m e treated steel sheet is characterized in that (1) the amounts of the metallic chromium layer and the chromium oxide layer deposited are 70-130 mg/m2 and 5-30 mg/m2, respectively, as metallic chromium; the amount of alkalisoluble chromium in these layers after heating at 210°C for 10 minutes is not more than 12 mg/m2 and not more than 70% by weight of the amount of the deposited chromium oxide before heating; the area of thickness unevenness of the chromium oxide is not more than 10%; and the amount of iron exposed is not more than 30 mg/dm2, expressed as the amount of copper deposited on the sheet when dipped in 5% aqueous copper sulfate penta- hydrate solution at 30°C for 60 seconds, (2) the organic lacquer film layer is a baked and cured film of a mixed lacquer composed of 70 to 85 parts by weight of an epichlorohydrin-bisphenol A type epoxy resin having a number average molecular weight of 2900 to 3750 and 30 to 15 parts by weight of a resol-type phenolic resin derived from a monohydric phenol, bisphenol A and an aldehyde; the phenolic resin has such a molecular weight distribution that the proportion of a high-molecular-weight portion having 3 or more rings is 60 to 70% by weight and the proportion of a low-molecular-weight portion having 2 or less rings is 40 to 30% by weight; and the baked and cured film contains 83 to 87 parts by weight of the epoxy resin and 17 to 13 parts by weight of the phenolic resin.
378201
Hotta Hisashi
Kitamura Yoichi
Smart & Biggar
Toyo Seikan Kaisha Limited
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