Patent ID: 7211298
Filing Date: 2007-05-01
Classification: B05D,B32B,C23C

Abstract:
1. A process for producing an electrostatically fiber planted steel sheet by a fiber planting operation, comprising: providing a surface treated steel sheet having a surface to be coated; directly coating the treated surface of said surface treated steel sheet with a roll coater, spray or applicator with an aqueous adhesive composition for planting fibers comprising an emulsion resin having a glass transition temperature of −40 to 40° C. as an essential ingredient and optionally comprising 0 to 20 parts by weight of an aqueous coloring pigment dispersion, 0 to 3 parts by weight of a defoamer, 0 to 5 parts by weight of a pH modifier, 0 to 25 parts by weight of a crosslinking agent, 0 to 10 parts by weight of a thickener and 0 to 20 parts by weight of a water-soluble resin added as optional components based on 100 parts by weight of the resin to form a fiber planting layer tightly adhered to the steel sheet on the surface of the steel sheet without a primer containing an anticorrosive pigment; and electrostatically planting fibers into the fiber planting layer while the surface of the fiber planting layer retains adhesion; wherein, the fiber planting operation is carried out such that the fibers are planted so that roots of said fibers are situated at an intermediate depth position of the fiber planting layer thickness; and a fiber planting voltage is controlled to 10 to 80 kV, and the viscosity of the adhesive composition for planting fibers is adjusted to 200 to 20,000 cps/25° C. to ensure that the fibers do not extend through the fiber planting layer and do not contact the surface of the surface treated steel sheet.