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With the obvious issues stated in section 5 the formulator needs to be cognizant of the following questions,

1 a. Which oligomers should one use to give the best performance during cure with the least amount of oxygen inhibition?

2 b. Which monomers should one use to give the best performance with the minimum amount of oxygen inhibition?

3 c. Which PIs should one use to utilize the wavelength emitted by the GA-FL and LED light sources?

4 d. From an industrial hygiene (IH) standpoint which are the safest acrylate monomers that should be evaluated in developing a nail gel UV-A cured system?

As was shown earlier in Figure 3.12 the type of oligomer used will have a strong impact on cure and performance. Targeting oligomers that respond best to low wattage GA-FL and LED units should be the formulation chemists top priority.

Figure 3.12 High throughput primary screening results based on the evaluation of over 25,000 coatings followed by a statistical analysis. The x-axis shows the PI and PI combinations that were evaluated. The y-axis shows the oligomers and oligomer combinations that were evaluated. Shown is the average predicted surface cure for all resin-photoinitiator combinations after curing using a 250 W UV-A light source. The average is taken over all other parameters screened in this experiment. Thus, each circle represents an average of 48 values (3 reactive diluents, 2 photoinitiator concentrations, 4 irradiation times and 2 lamp distances). The bigger the circle the better the surface cure.