Oil soluble taggants
A process for detecting oil or lubricant contamination in the production of an article by adding a Stokes-shifting taggant to an oil or lubricant of a machine utilized to produce the article or a component thereof, irradiating the articles produced with a first wavelength of radiation, and monitoring the articles for emission of radiation at a second wavelength. The taggant can be in the form of a composition containing a Stokes-shifting taggant, which absorbs radiation at a first wavelength and emits radiation at a second wavelength, different from said first wavelength, dissolved or dispersed in an oil or lubricant.
1. A fluorescent taggant composition, comprising:
a Stokes-shifting taggant, which absorbs infrared radiation at a first wavelength and emits infrared radiation at a second wavelength as a primary emission peak, different from the first wavelength; and
an oil, a lubricant, or both an oil and a lubricant,
wherein the taggant is an organic compound which has been complexed to cause a secondary emission peak on a negative slope of the primary emission peak.
2. The composition of claim 1 , wherein the Stokes-shifting taggant is present in a minor amount and the oil or lubricant is present in a major amount.
3. The composition of claim 1 , wherein the Stokes-shifting taggant is present in an amount of from about 0.1 to about 5 wt % in the oil, the lubricant, or both the oil and the lubricant.
4. The composition of claim 1 , wherein the Stokes-shifting taggant is an oil-soluble taggant and is dissolved in the oil, the lubricant, or both the oil and the lubricant.
5. The composition of claim 1 , wherein the Stokes-shifting taggant is an oil-dispersible taggant and is dispersed in the oil, the lubricant, or both the oil and the lubricant.
6. The composition of claim 1 , wherein the Stokes-shifting taggant is added to the oil, the lubricant, or both the oil and the lubricant at a concentration of between about 10 ppm and about 100 ppm.
7. The composition of claim 1 , wherein the taggant has the following chemical structure:
8. A taggant composition, comprising:
an oil-soluble infrared fluorescent taggant; and
an oil, a lubricant, or both an oil and a lubricant,
wherein the taggant is an organic compound which has been complexed to cause a secondary emission peak on a negative slope of a primary emission peak.
9. The taggant composition of claim 8 , wherein the taggant is a Stokes-shifting taggant, which absorbs infrared radiation at a first wavelength and emits infrared radiation at a second wavelength, different from the first wavelength.
10. The taggant composition of claim 8 , wherein the Stokes-shifting taggant is present in a minor amount and the oil, the lubricant, or both the oil and the lubricant is present in a major amount.
11. The taggant composition of claim 10 , wherein the Stokes-shifting taggant is present in an amount of from about 0.1 to about 5 wt % in the oil, the lubricant, or both the oil and the lubricant.
12. The taggant composition of claim 9 , wherein the Stokes-shifting taggant is an oil-soluble taggant and is dissolved in the oil, the lubricant, or both the oil and the lubricant.
13. The composition of claim 9 , wherein the Stokes-shifting taggant is an oil-dispersible taggant and is dispersed in the oil, the lubricant, or both the oil and the lubricant.
14. The taggant composition of claim 8 , wherein the taggant has the following chemical structure:
15. The composition of claim 1 , further comprising a surfactant, a dispersant additive, or both a surfactant and a dispersant additive.
16. The composition of claim 9 , further comprising a surfactant, a dispersant additive, or both a surfactant and a dispersant additive.