B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/149
B32B 15/08 (2006.01) B05D 7/00 (2006.01) B32B 15/18 (2006.01) C08G 18/40 (2006.01) C08G 18/58 (2006.01) C08G 59/40 (2006.01) C09D 175/04 (2006.01) C23C 22/24 (2006.01) C25D 13/20 (2006.01)
Patent
CA 2007905
ABSTRACT OF THE DISCLOSURE The present invention provides an organic composite plated steel sheet highly susceptible to cationic electrodeposition comprising a steel substrate plated with one selected from the group consisting of zinc, a zinc alloy, a zinc composite alloy, or aluminum, and a first layer of a less soluble chromate film having a water soluble content of 5% or less formed on the substrate in an amount of 10 to 150 mg as the total amount of chromium per square meter, and a second layer as a solid thin coating film of 0.2 to 2 µm formed on the first layer, the second layer being formed with a coating composition containing 10 to 50% by weight of solids comprising: (a) 30% by weight or more of a bisphenol A type epoxy resin having a number average molecular weight of 300 to 100,000 based on the total solids in the coating composition; (b) a weight ratio of at least one curing agent selected from the group consisting of polyisocyanate compounds and block polyisocyanate compounds to the epoxy resin solid of 0.1 to 2.0; (c) 5 to 50% by weight of fumed silica having an average particle size of 0.1 to 100 nm based on the total solids in said coating composition; (d) at least one pigment selected from the group consisting of insoluble azo type, azo lake type, and phthalocyanine type organic pigments having an average size of 0.01 to 2 µm in an amount of 0.1 to 15% by weight ? based on the total solids in the coating composition and in a weight ratio of the pigment to the fumed silica of 0.01 to 1.0; and (e) 40% or more of a ketone type organic solvent in the coating composition.
Shimazu Takashi
Shindou Yoshio
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
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