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Method of producing matched coating composition and device used therefor

  • US 20060181707A1
  • Filed: 05/06/2004
  • Published: 08/17/2006
  • Est. Priority Date: 05/07/2003
  • Status: Active Grant
First Claim
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1. A method for producing a matched coating composition for a specified end-use, said method comprising:

  • (i) measuring reflectances of a target portion of a target coating at a set of preset wavelengths with a spectrophotometer of a coating characterizing device to plot a target spectral curve of said target portion;

    (ii) calculating target color (L,a,b or L,C,h) values of said target portion from said target spectral curve of said target portion;

    (iii) selecting one or more preliminary colorant combinations from a stored list of known colorants in accordance with a combinatorial selection criteria to match with said target color values;

    (iv) determining concentration of each said known colorant in each of said preliminary colorant combinations in accordance with color matching criteria wherein said concentration of each said known colorant is optimized for optimal match of color values of each of said preliminary colorant combinations with said target color values;

    (v) balancing said preliminary colorant combinations to allow for the presence of non-colorant components in said matched coating composition to generate one or more viable combinations optimized in accordance with mixing and regulatory criteria developed for said specified end-use; and

    (vi) selecting an optimal viable combination from said viable combinations in accordance with an acceptability equation for said specified end-use, said optimal viable combination having an optimal acceptability value for said specified end-use wherein said known colorants and non-colorant components when mixed in accordance with said optimal viable combination produce said matched coating composition that when applied as a matched coating visually matches with the appearance of said target coating.

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