RESIN IMPREGNATED FIBER WEBS

The present disclosure relates to filter media having one or more pre-filter layers disposed upstream a main filtration layer. The main filtration layer may include synthetic polymer fibers (e.g., continuous meltblown fibers). A coating (e.g., binder resin) may be suitably applied to at least a portion of the main filtration layer (e.g., saturated, impregnated) and/or other layers of the filter media (e.g., pre-filter layer(s), scrim, etc.), or portions thereof. In some embodiments, the coating has a cure temperature that is comparatively less than a shrinkage temperature of the synthetic polymer fibers of the filtration layer(s). In some embodiments, the coating may coat a 5 cm×5 cm area, or a majority area, of the outer surface of the second layer. In some embodiments, the second layer has a pressure drop of less than about 80 kPa, a mean flow pore size of between about 0.05 micron and about 30 microns with the standard deviation of the mean flow pore size of the second layer being less than about 10 microns.