Use of perlite based effect pigments for finishes with antique, or patina appearance
AssigneeBASF SE
InventorsRaimund Schmid, Ellen Schmidt
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Abstract
The present invention provides a process for imparting a simulated patina, or antique appearance to a substrate by using a coating composition comprising a perlite based effect pigment. The perlite based effect pigment functions as colorant and matting agent and shows an almost angle independent brightness. The process provides, for example, decorative wall coatings showing enhanced antique, or patina effects as compared to conventional effect pigments on basis of mica.
Claims12
A process for imparting a simulated patina to a substrate comprising the steps of applying a colorant coating composition to the surface of the substrate to produce a continuous layer of said colorant coating composition on the surface of the substrate thereby providing an initial color tone on said substrate;
- and applying a perlite based effect pigment composition on the colorant layer to produce a noncontinuous layer of said perlite based effect pigment composition on the colorant layer, thereby providing the simulated patina via interspersed spots of the initial color tone and the perlite based effect pigment finish,
- wherein said simulated patina simulates age and/or exposure to the elements,
- wherein several perlite based effect pigment compositions may be used to create a patina with inhomogeneous appearance on the colorant layer, and
- wherein the simulated patina appearance is a silver, copper, rust, or golden patina appearance.
A process of using perlite based effect pigments as colorant and matting agent in a 2-coat arrangement for producing finishes with patina, comprising the steps of
- selecting a first coating comprising a colorant,
- selecting a second coating comprising a perlite based effect pigment, and
- applying the first and the second coatings to the surface of a substrate,
- wherein said simulated patina simulates age and/or exposure to the elements,
- wherein the simulated patina is a silver, copper, rust, or golden patina appearance.
Dependencies are inferred from the claim text.