초록 ▼

The media comprises cellulosic fiber and silica based particulate or fiber filter elements and a charge modifying amount of a cationic charge modifying system bonded to the surfaces thereof. A component of the charge modifying system is a primary charge modifying agent characterized as a water solub

The media comprises cellulosic fiber and silica based particulate or fiber filter elements and a charge modifying amount of a cationic charge modifying system bonded to the surfaces thereof. A component of the charge modifying system is a primary charge modifying agent characterized as a water soluble organic polymer capable of being adsorbed into the filter elements and having a molecular weight greater than about 1000. Each monomer of the polymer can have at least one epoxide group capable of bonding to the surface of the filter elements and at least one quaternary ammonium group. Preferably, the primary charge modifying agent is a polyamido-polyamine epichlorohydrin resin, a polyamine epichlorohydrin resin, or a resin based upon diallylnitrogen-containing materials reacted with epichlorohydrin. A portion of the epoxy groups on the organic polymer are bonded to the secondary charge modifying agent. This secondary charge modifying agent is an aliphatic polyamine having at least one primary amine or at least two secondary amines.

대표청구항 ▼

A filter media comprising filter elements of cellulose fiber and silica based particulate or fiber and a charge modifying amount of a cationic charge modifying system bonded to surfaces of the elements, the system comprising: a primary charge modifying agent which is a water soluble organic polymer

A filter media comprising filter elements of cellulose fiber and silica based particulate or fiber and a charge modifying amount of a cationic charge modifying system bonded to surfaces of the elements, the system comprising: a primary charge modifying agent which is a water soluble organic polymer capable of being adsorbed onto the elements and having a molecular weight of greater than about 1000, each monomer of the polymer having at least one epoxide group capable of bonding to the surfaces of the elements and quaternary ammonium groups; and a secondary charge modifying agent bonded to a portion of the epoxy groups on the organic polymer, wherein said secondary charge modifying agent is an aliphatic polyamine having at least one primary amine or at least two secondary amines.