N-Methylpyrrolidone (NMP)

First, N-methylpyrrolidone is a very slow evaporating solvent. NMP has a boiling point of 202°C. A thin film of NMP requires over 15,000 s for 90% evaporation at room temperature. (See the solvent properties in Table 6.2 at the end of this chapter.) If this is the only solvent used in PAI- or PES-based coatings, viscosity does not build up rapidly after the application and the coating will be prone to running, dripping, and sagging. The most effective fast-evaporating solvent for these resins is DMF, but that solvent has serious safety issues.





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