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US 6,719,452 B2Granted
Process for manufacturing transparent tints
AssigneeE. I. Du Pont de Nemours and Company
InventorsKen Stephen Schermacher, Allan Blase Joseph Rodrigues, Anthony Joseph Martino, Douglas E. Spahr, Timothy Aaron Snyder
Life of this patent
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Abstract
A rapid process for making transparent tints that match the color and tinting strength of a standard tint. The process involves the use of a faster and more accurate shading technique that utilizes the light transmittance properties of the tints in the wet over the visible spectrum and calculates therefrom the amount of components required to bring the tint within an acceptable match to the standard.
Claims9
A process for making a transparent tint which comprises
- (a) charging the components of a transparent tint, said components comprising a clear polymeric binder for the tint, solvent for the tint, and colorant in a mixing vessel;
- (b) blending the components to form a liquid tint composition;
- (c) shading the tint during its manufacture by passing the liquid tint through a controlled pathlength transmittance cell coupled to a spectrophotometer;
- (d) measuring the spectral transmittance of the liquid tint over the visible spectrum;
- (e) calculating the color values of the wet tint being manufactured from the light transmittance measurements;
- (f) comparing the color values of the wet tint being manufactured to the color values of the standard wet tint and calculating the difference between the values of the tint being manufactured and the standard tint and calculating the quantity of colorants to be added to the tint to bring the tint within specified color and strength tolerance values;
- (g) adding to the tint being manufactured the quantities of components calculated in step (f);
- (h) repeating steps (b)-(f) at least once in the event the tint is not within the specified color and strength tolerance until the tint being manufactured is within said tolerance.
5 more elements
Dependencies are inferred from the claim text.