B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
204/97.04
B32B 15/18 (2006.01) B05D 7/00 (2006.01) B32B 27/38 (2006.01) C08G 18/58 (2006.01) C09D 175/04 (2006.01) C23C 22/28 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1334186
Disclosed is a steel sheet having an organic composite plating layer excellent in press workability, spot weldability, electrodeposition coatability and corrosion resistance which comprises a zinc plated, aluminum plated or zinc base composite alloy plated steel sheet, a first layer of an insoluble chromate film of 5% or less in the content of water-soluble matter formed on the surface of the steel sheet at a coverage of 10-150 mg/m2 in terms of chromium content and a second layer of a coating composition having the following composition coated at a thickness of 0.3-5 µm as a solid film on said first layer: (A) a bisphenol type epoxy resin having a number- average molecular weight of 300-100,000 in an amount of 30% by weight or more of solid matter in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid matter in the epoxy resin of 1/10 - 20/10, (C) fumed silica having an average particle size of 0.1 - 100 mµ in an amount of 5-50% by weight of solid matter in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content of the coating composition being 10-50% by weight.
571003
Kabeya Motoo
Shimazu Takashi
Shindou Yoshio
Yamazaki Fumio
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
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