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US 4,180,609 AGranted
Article coated with fluoropolymer finish with improved scratch resistance
AssigneeE. I. Du Pont de Nemours and Company
InventorEustathios Vassiliou
Life of this patent
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Abstract
The apparent scratch resistance of articles coated with a fluoropolymer finish is improved if the article is coated with at least two coats with the topcoat containing mica particles, mica particles coated with a pigment, or metal flake in a smaller amount than is contained in the coat under the topcoat.
Claims17
An article bearing a basecoat derived from a composition comprising:
- (a) a particulate polymer polymerized or copolymerized from monomers selected from one or more monoethylenically unsaturated hydrocarbon monomers and hydrocarbon ether monomers, said monomers being completely substituted with fluorine atoms or a combination of fluorine atoms and chlorine atoms;
- (b) mica particles, mica particles coated with pigment, or metal flake;
- and
- (c) a liquid carrier;
- overlaid with a topcoat finish derived from a composition comprising (a), (b) and (c), with the concentration of (b) in the topcoat being from 10% to 90% of the concentration of (b) in the basecoat.
2 more elements
A method for improving the apparent scratch resistance of an article bearing a basecoat derived from a composition comprising:
- (a) a particulate polymer polymerized or copolymerized from monomers selected from one or more monoethylenically unsaturated hydrocarbon monomers and hydrocarbon ether monomers, said monomers being completely substituted with fluorine atoms or a combination of fluorine atoms or chlorine atoms;
- (b) mica particles, mica particles coated with pigment, or metal flake;
- (c) a polymer of monoethylenically unsaturated monomers which depolymerizes and whose depolymerization products vaporize in the temperature range of about 150.degree. C. below the fusion temperature of (a) to about the decomposition temperature of (a);
- and
- (d) a liquid carrier;
- the method comprising topcoating the basecoat with a composition comprising (a), (b), (c) and (d), wherein the concentration of (b) in the topcoat is from 10% to 90% of the concentration of (b) in the basecoat, and then fusing the coatings.
3 more elements
Dependencies are inferred from the claim text.