Filter for smoking article

Abstract

The present invention addresses the problem of providing a filter for a smoking article, or the like, which does not reduce, more than necessary, components affecting flavor which are contained in mainstream smoke, and which does not release aroma components other than an aroma component which is attributable to tobacco smoke. The foregoing problem is solved by a filter for a smoking article, the filter comprising a filter segment which does not release aroma components and which has a porous material that includes: inactive particles which do not selectively reduce components contributing to flavor with respect to raw tar in tobacco smoke; and a non-fibrous binder resin.

What is claimed is: 
     
         1 . A filter for a smoking article, the filter comprising
 a filter segment including
 a porous material containing
 an inert particle neither releasing any aroma component nor selectively reducing any component contributing to flavor and taste relative to crude tar in tobacco smoke and 
 a nonfibrous binder resin. 
 
   
     
     
         2 . The filter for a smoking article according to  claim 1 , wherein
 the inert particle is thermally stable at 150° C.   
     
     
         3 . The filter for a smoking article according to  claim 1 , wherein
 the inert particle is at least one selected from a cellulose particle, an un-activated carbide particle, a calcium carbonate particle, and an aluminum nitride particle.   
     
     
         4 . The filter for a smoking article according to  claim 3 , wherein
 the un-activated carbide particle has a benzene adsorption ability of from 0.5 to 0.7 measured according to JIS K 1474.   
     
     
         5 . The filter for a smoking article according to  claim 3 , wherein
 the cellulose particle, the calcium carbonate particle, and the aluminum nitride particle has a BET specific surface area of 10 m 2 /g or less.   
     
     
         6 . The filter for a smoking article according to  claim 1 , wherein
 the inert particle has a particle diameter of from 10 to 70 meshes according to JIS Z8801-1 (2006).   
     
     
         7 . The filter for a smoking article according to  claim 1 , wherein
 the inert particle has a specific gravity of 5 g/cm 3  or less.   
     
     
         8 . The filter for a smoking article according to  claim 1 , wherein
 the binder resin is a thermoplastic resin.   
     
     
         9 . The filter for a smoking article according to  claim 1 , wherein
 the filter segment including the porous material containing the inert particle and the nonfibrous binder resin includes no plasticizer.   
     
     
         10 . The filter for a smoking article according to  claim 1 , wherein
 the inert particle and the nonfibrous binder resin are at a weight ratio of from 70:30 to 80:20 in the porous material.