| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating material for forming a porous film which enables forming of the porous film showing the high capturing efficiency for a particulate substance even in such a state that the accumulation of this substance is at a low level, and also, a low pressure loss, on the surface of a partition wall of a honeycomb structure-type filter which constitutes an exhaust gas cleaning filter such as DPF. SOLUTION: The coating material for forming the porous film is for forming the porous film having a smaller average pore diameter than the average pore diameter of a porous support, on the surface of the porous support of the honeycomb structure-type filter. The coating material includes at least microparticles containing an oxide and silver, and a dispersion medium. The microparticle has a specific surface of not less than 1 m<SP>2</SP>/g and not more than 125 m<SP>2</SP>/g, a tap bulk density of not less than 0.1 g/cm<SP>3</SP>and not more than 2.0 g/cm<SP>3</SP>, and an average secondary particle diameter of the coating material of not less than 0.1μm and not more than 10μm. Besides, the viscosity of the coating material is not less than 2 mPa s and not more than 1,000 mPa s. COPYRIGHT: (C)2011,JPO&INPIT
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