Diesel particle filter with improved back pressure characteristics

A diesel particle filter comprising a ceramic wall-flow filter substrate and a coating applied in the inflow ducts, wherein

• the wall-flow filter substrate comprises inflow ducts, outflow ducts, and walls between the inflow ducts and the outflow ducts,
• the walls comprise pores that connect the inflow ducts and outflow ducts,
• the coating comprises material with a high melting point and has a solid matter loading of 1-50 g/L in relation to the volume of the wall-flow filter substrate,
• the coating is present in a manner that closes off pores that connect the inflow ducts and outflow ducts in a manner that inhibits the passage of soot particles at the inflow side without preventing the passage of gaseous exhaust-gas constituents, and
• the material of the coating predominantly contains one or more oxides which have a high melting point and the particle sizes of which are adapted to the pore sizes in the wall of the wall-flow filter substrate in such a way that the d90 value of the particle size distribution of the one or more oxides is equal to or greater than the d95 value of the pore size distribution of the wall-flow filter substrate, wherein
• the d90 value of the particle size distribution of the one or more oxides means that 90% of the total volume of the one or more oxides contains only particles whose diameters are less than or equal to the value specified as d90, and
• the d95 value of the pore size distribution of the wall-flow filter substrate means that 95% of the total pore volume determinable by mercury porosimetry is formed by pores whose diameters are less than or equal to the value specified as d95.