Filter medium and method for producing such a filter medium

A method for producing a filter medium having a filter material, comprising:

• bringing the filter material into contact with an anti-pathogenic substance, an ion exchanger, and a polymeric cross-linking agent via a coating solution including a solvent, the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent;
• securely arranging the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent at least one of on the filter material and in the filter material via vaporizing the solvent;
• fixing the anti-pathogenic substance and the ion exchanger on the filter material via activating the polymeric cross-linking agent with the ion exchanger, wherein the polymeric cross-linking agent and the ion exchanger are coordinated with one another such that the ion exchanger activates the polymeric cross-linking agent;
• and
• wherein the ion exchanger is hygroscopic and includes functional cation exchanger groups with sulphonic acid groups.

A filter medium for filtering air in a passenger compartment of a motor vehicle, comprising a filter material and produced via a process including:

• bringing the filter material into contact with an anti-pathogenic substance, an ion exchanger, and a polymeric cross-linking agent via a coating solution including a solvent, the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent;
• securely arranging the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent at least one of on the filter material and in the filter material via vaporizing the solvent;
• and
• fixing the anti-pathogenic substance and the ion exchanger on the filter material via activating the polymeric cross-linking agent with the ion exchanger;
• wherein the polymeric cross-linking agent and the ion exchanger are coordinated with one another such that the ion exchanger activates the polymeric cross-linking agent;
• and
• wherein the ion exchanger is hygroscopic and includes functional cation exchanger groups with sulphonic acid groups.

A filter element of a passenger compartment air filter of an air-conditioning system of a vehicle, comprising a filter medium including a filter material, the filter material produced via a process including:

• bringing the filter material into contact with an anti-pathogenic substance, an ion exchanger, and a polymeric cross-linking agent via a coating solution including a solvent, the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent;
• securely arranging the anti-pathogenic substance, the ion exchanger, and the polymeric cross-linking agent at least one of on the filter material and in the filter material via vaporizing the solvent;
• and
• fixing the anti-pathogenic substance and the ion exchanger on the filter material via activating the polymeric cross-linking agent with the ion exchanger;
• wherein the polymeric cross-linking agent and the ion exchanger are coordinated with one another such that the ion exchanger activates the polymeric cross-linking agent;
• and
• wherein the ion exchanger is hygroscopic and includes functional cation exchanger groups with sulphonic acid groups.