B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
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B
117/149
B32B 15/08 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) B32B 15/18 (2006.01) C08G 59/14 (2006.01) C09D 5/08 (2006.01) C09D 163/00 (2006.01) C09D 177/00 (2006.01) C23C 22/30 (2006.01) C25D 5/48 (2006.01) C25D 13/20 (2006.01)
Patent
CA 2013601
ABSTRACT This invention provides a highly corrosion- resistant, colored thin film-coated steel sheet having excel- lent press-processability and spot-weldability, which com- prises a plated steel sheet, a first layer of a sparingly soluble chromate film formed on surface(s) of the plated steel sheet and having a water soluble content of 1 to 30%, a Cr6+/Cr3+ ratio of 0.01 to 1.0 and a total chromium build-up of 10 to 150 mg/m2 on one surface, and a second layer of a 0.3 to 5 µ thick solid coating film formed of an organic solvent-type coating composition, the solid coating film being comprised, based on the weight of the nonvolatile content, of (a) a urethanated epoxy ester resin having a number average molecular weight of 300 to 100,000: 30 to 90%, (b) a hydrophilic polyamide resin having a polymerization degree of 50 to 1,000: 5 to 40%, (c) a silica powder having an average particle diameter of 1 to 100 mµ: 5 to 40%, (d) a lubricant: 1 to 20%, and (e) at least one member selected from a group consisting of inorganic, and insoluble azo-type, azolake-type or phthalocyanine-type organic pigments having an average particle diameter of 0.05 to 5 µm: 0.1 to 20%.
Kabeya Motoo
Shindou Yoshio
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
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