| 摘要 |
PROBLEM TO BE SOLVED: To provide a useful cigarette filter which can hold smoking flavor ingredients, such as, nicotine and tar, can selectively and efficiently remove formaldehyde, and will not sharpen the smoking flavor of cigarettes. SOLUTION: This cigarette filter comprises a cigarette filter material, formed from a porous material having an average pore diameter of 5 to 350 nm, preferably silica gel. The cigarette filter material can efficiently and selectively remove formaldehyde, even though the surface of the porous material has not been treated at all. A cigarette filter produced by disposing the cigarette filter material in a middle portion whose both end portions are formed of filter rods and can hold nicotine and tar at retention rates of 75% or higher, and can simultaneously lower the formaldehyde retention rate down to 40% or lower and will not increase the ventilation resistance. COPYRIGHT: (C)2008,JPO&INPIT |
