Color chips prepared by color clustering used for matching refinish paints

• US 20070292608A1
• Filed: 06/15/2007
• Published: 12/20/2007
• Est. Priority Date: 06/16/2006
• Status: Abandoned Application

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Rodrigues, Allan Blase Joseph
• Application Number:
  US11/818,680
• Publication Number:
  US 20070292608A1
• Time in Patent Office: Days
• US Class Current: 427/140
• CPC Class Codes: B05D 5/005 Repairing damaged coatings
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: G01J 2003/466 Coded colour; Recognition of predetermined colour; Determining proximity to predetermined colour
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/504 Goniometric colour measurements, for example measurements of metallic or flake based paints

Abstract

A process for refinishing or repainting a damaged paint area of a vehicle or part thereof using a computer-implemented method to determine a refinish paint formula that can form a refinish matching paint to match the color of the original paint; in this process:

• a) a color code which contains color data values of the original paint is acquired;
• c) the color code is entered into a computer containing a color cluster database and color clusters and each color cluster has a centroid and refinish paint formula associated therewith;
• c) the color clusters associated with the color code of the original paint are identified;
• d) color chips that correspond to each of the color clusters identified in step c) using the refinish paint formula associated with the centroid of each of the color clusters are prepared or alternatively color chips provided by a manufacturer of the refinish paint can be used;
• e) a matching chip having the closest color match to the original paint is determined visually;
• f) the refinish paint associated with the matching chip identified in step e) as the closest color match is selected as the refinish matching paint and spray applied to the damaged paint area by an operator using conventional techniques thereby matching the color characteristics of the refinish matching paint to the undamaged original paint of the vehicle.

Claims

1. A process for refinishing a damaged paint area of a vehicle or part thereof with an original paint using a computer-implemented method to determine a color matchable refinish paint formula used to form a refinish matching paint being used to repair the damaged paint area and match the color of the original paint;

said process comprising;

a) acquiring a color code for the original paint to be matched wherein the color code contains color data values of the original paint;

b) entering the color code into a computer containing a color cluster database and color clusters, wherein each color cluster having a centroid and a refinish paint formula associated with each centroid;

c) identifying the color clusters associated with the color code of the original paint;

d) preparing color chips that correspond to each of the color clusters-identified in step c) using the refinish paint formula associated with the centroid of each of the color clusters;

e) positioning each of the color chips prepared in step d) on or adjacent to the original paint and visually determining a matching chip. having the closest color match;

f) using the refinish paint associated with the matching chip identified in step e) as the refinish matching paint and spray applying the refinish matching paint to the damaged paint area by an operator thereby matching the color characteristics of the refinish matching paint to the undamaged original paint of the vehicle or part thereof using conventional spraying, blending and shading techniques and drying and curing the refinish matching paint.

2. The process of claim 1, wherein the refinish matching paint is a repair basecoat for repairing a basecoat/clearcoat finish.

3. The process of claim 1 wherein the refinish matching paint is a pigmented repair mono coat for repairing a pigmented mono coat finish.

4. The process of claim 1 wherein the color data values, the color cluster database and the color clusters comprise L*, a*, b* color data values.

5. The process of claim 4 wherein the L*, a* and b* values are measured at three different angles wherein the three angles are identical to those angles used to measure the original paint color.

6. The process of claim 5 wherein the original paint contains solid color pigments, special effect pigments, metallic flake pigments or any mixtures thereof.

7. The process of claim 4 wherein the color cluster database comprises L*, a*, b* color data values taken at least three different viewing angles for a specific color determined from at least three readings from different areas of the vehicle from vehicles made by the same manufacturer at least at one vehicle manufacturing site.

8. The process of claim 4 wherein each of the values of the color cluster database are plotted on video screen as a three dimensional layout.

9. The process of claim 1 or 7 wherein color clusters in the color cluster database are determined via computer implementation using standard statistical techniques, a centroid is determined for each cluster and a refinish paint formula is determined via computer implementation for the centroid of each color cluster and color chips are prepared using the refinish paint for the centroid of each color cluster.

10. The process of claim 8 wherein color clusters in the color cluster database are determined via computer implementation using standard statistical techniques, a centroid is determined for each cluster and a refinish paint formula is determined via computer implementation for the centroid of each color cluster.

11. The process of claim 8 wherein a color gamut visualizer is used to view color clusters and centroids for each color cluster.

12. A process for refinishing a damaged paint area of a vehicle or part thereof using a computer-implemented method to determine a color matchable refinish paint formula used to form a refinish matching paint being used to repair the damaged paint area and match the color of the original paint;

said process comprising;

a) acquiring a color code of the original paint to be matched;

b) obtaining color chips from a paint manufacturer directly associated with the color code of the original paint to be matched;

whereby the paint chips are prepared according to color clustering techniques utilizing a computer containing color data values, a color cluster database and color clusters of the paint;

wherein each color cluster identified by color cluster techniques has a centroid and a refinish paint formula associated with each centroid and paint chips are prepared by the paint manufacturer for each of the paint formulas;

c) positioning each of the color chips prepared by the paint manufacturer for each refinish paints prepared from the refinish paint formula of step b) on or adjacent to the original paint and visually determining the closest color match and

d) using the refinish paint associated with the color chip identified in step c) as the refinish matching paint and spray applying the refinish matching paint to the damaged paint area by an operator thereby matching the color characteristics of the refinish matching paint to the undamaged original paint of the vehicle using conventional spraying, blending and shading techniques and drying and curing the refinish matching paint.