Patent ID: 6550622
Filing Date: 2003-04-22
Classification: B01D,B01J,C02F

Abstract:
A filter medium comprising:a discrete adsorbent layer having a powdered mixture of a particulate adsorbing agent and a particulate binding agent coating a first supporting substrate, wherein said particulate binding agent interconnects said particulate adsorbent agent and fuses said powdered mixture to said first supporting substrate upon heating said powdered mixture to a t least a Vicat softening temperature of said particulate binding agent but below the melting temperature of said particulate adsorbing agent; and a discrete hydrophilic microparticulate intercepting layer disposed adjacent to said adsorbent layer having a second supporting substrate wherein a front surface of said second supporting substrate faces a back surface of said first supporting substrate, wherein said composite filter medium has a mean flow pore diameter of about 1 to 10 microns, a bubble point of about 3 to about 15 microns and an air permeability of about 0.5 to 7 liters per minute/cm2 with a pressure drop of about 0.1 bar.