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US 4,213,886 AGranted
Treatment of aluminum flake to improve appearance of coating compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert L. Turner
Life of this patent
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Abstract
An improvement in coating compositions containing aluminum flake is provided. The improvement is coating the aluminum flake with a mono-ethylenically unsaturated silane and then reacting the silane coated flake with acrylic monomers having amine hydroxyl or epoxy groups to form an acrylic coating prior to placing the aluminum flake into the coating composition.
Claims5
An improvement in water based coating compositions containing aluminum flake, the improvement comprising:
- utilizing a coated aluminum flake;
- wherein the aluminum flake was coated with at least 100% of the quantity required to form a monolayer on the surface area of the flake of mono-ethylenically unsaturated silane and was reacted with acrylic monomers having functional groups to form an acrylic topcoat on the flake;
- wherein the silane is selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (beta-methoxyethoxysilane) and gamma-methacryloxy-propyltrimethoxysilane.
The improvement of claim l wherein the silane is gamma-methacryloxypropyl-trimethoxysilane.
Dependencies are inferred from the claim text.