Resin-coated steel sheet having good electrocoatability and weldability
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsKenji Miki, Hirohiko Sakai
Life of this patent
Estimating the term…
Abstract
A resin-coated steel sheet having good electrocoatability and weldability, characterized in that the resin coating is formed on the layer of zinc plating or zinc alloy plating (with or without subsequent chromate treatment) and is composed mainly of urethane resin containing (a) either colloidal silica or a silane coupling agent and (b) a phosphate of Al, Ba, Ca, Co, Fe, Mg, Mn or Zn in an amount of 0.01-35 wt % (with or without an additional organic pigment fine powder in an amount of 0.01-40 wt %).
Claims9
A resin-coated steel sheet wherein the steel sheet is coated with 0.1-1.0 g/m.sup.2 of a resin film consisting essentially of:
- (i) a urethane resin,
- (ii) 0.01-35 wt % of a metal phosphate of Al, Ba, Ca, Co, Fe, Mg, Mn, or Zn based on the weight of said urethane resin, wherein said metal phosphate has an average particle diameter of .ltoreq.3 .mu.m, either
- (iiia) 5-80 wt % colloidal silica, based on the weight of said urethane resin, or
- (iiib) 1-40 wt % of a silane coupling agent, based on the weight of said urethane resin and, optionally,
- (iv) 0.01-40 wt % of an organic pigment based on the weight of said urethane resin, wherein said organic pigment has an average particle diameter of .ltoreq.1.0 .mu.m.
A resin-coated steel sheet wherein the steel sheet is coated with 0.1-1.0 g/m.sup.2 of resin consisting of:
- (i) a urethane resin,
- (ii) 0.01-35 wt % of a metal phosphate of Al, Ba, Ca, Co, Fe, Mg, Mn, or Zn based on the weight of said urethane resin, wherein said metal phosphate has an average particle diameter of .ltoreq.3 .mu.m, either
- (iiia) 5-80 wt % colloidal silica, based on the weight of said urethane resin, or
- (iiib) 1-40 wt % of a silane coupling agent, based in the weight of said urethane resin, and, optionally,
- (iv) 0.01-40 wt % of an organic pigment, based on the weight of said urethane resin, wherein said organic pigment has an average particle diameter of .ltoreq.1.0 .mu.m.
Dependencies are inferred from the claim text.