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![]() ![]() The colorant is applied as a non-continuous layer to provide the appearance of patination of the desired tone by interspersed spots of the colorant. The present invention imparts a simulated patina appearance to a copper substrate by the application of a colorant having a desired initial patina color to a copper substrate. 2 illustrates a substrate having a surface processed in accordance with the present invention and a copper sheet produced by that process. ![]() 1 is diagrammatic illustration of a spattering process employed in the practice of the present invention and,įIG. This is not only detrimental to the forming equipment but also significantly increases the cost of using the pre-patinated products. The equipment on which these forming operations take place are attacked by the residual materials employed in the pre-patination process such that they require significant additional maintenance and part replacement. That is, pre-patinated materials are typically available in sheets to be bent and/or cut in the desired configuration for installation. Additionally, and most important, such pre-patinated panels have been known to be harmful to the forming equipment employed in the fabrication of a final panel configuration. Further, dependent on the conditions in the region of installation, “maturity” may or may not provide a uniformity of appearance over time. Uniformity in appearance is not available at installation. This product provides a pre-patinated copper substrate that patinates further following installation. While this process may better mimic the appearance of patination, it is nonetheless a non-changing coating that does not (on application, or over time) satisfactorily simulate the unique character and aesthetic appeal of patinated copper.Ī further attempt to avoid the long patination process is the product available under the trademark EVERGREEN from Revere Copper Products, Inc. This second coating contains one or more copper-color-producing additives and has transparencies such that the patina color of the base coat may be perceived through the top coat while the top coat reflects light from its additives to provide a copper color. After the base coat is cured, a non-opaque top coat is applied. The first step applies an opaque patina colored base coating to a primed or unprimed substrate. 4,416,940 which discloses a two step process to impart a simulated weathered-copper appearance to a substrate. While this allows the use of cheaper substrates, its effect is not aesthetically pleasing in that paint lacks the unique character and appearance of patinated copper.Ī variation of the approach described above is disclosed in U.S. Indeed, in many instances, the patination of existing copper architectural elements renders their repair aesthetically impractical.Īn obvious prior art attempt to mimic patination is the utilization of a uniform coating of paint of a desired tone (color). Thus, while the end result, and even intermediate stages, are considered desirable, the length of the patination process, and the variation in colors during that process, delay the visual effects and complicates any necessary repairs. However, natural patination is very slow, taking as long as 20 years, or more. Patination of copper is a well known process and is desired in many architectural contexts for its unique, blue-green appearance. The present invention relates to copper architectural elements and, more particularly, to a simulated patina for such elements. After application, the colorant provides a simulated patina to the copper substrate surface while allowing the remaining (non-covered) portion of the substrate to patinate naturally. Non-uniformity may be accomplished by varying the volume of colorant sprayed during the application process or by varying the relative movement of the spray and substrate. The colorant is preferably a paint and may be applied by non-uniform spraying on the substrate surface. The interspersed spots of colorant may be produced by screen printing, by spattering, as by spraying, or by mechanical removal of colorant after application to the substrate surface, or a combination. The appearance of patination of the desired tone is created by interspersed spots of colorant with the remaining portion of the substrate being exposed for natural patination. A colorant having the desired initial patina color tone is employed to produce a non-continuous layer of colorant on the surface of a copper substrate. A process for imparting a simulated patina appearance to a copper substrate, and a substrate having that appearance. ![]()
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