Cigarette filter

A multiple section cigarette filter comprising:

• (a) a fibrous filter plug selected from the group consisting of cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or a combination thereof;
• (b) a selective adsorbent section comprising an ion-exchange resin having a surface area sufficient to ensure that the surface functional sites are easily accessible to a smoke constituent;
• and
• (c) a general adsorbent section comprising a general adsorbent material selected from the group consisting of activated charcoal, activated coconut carbon, activated coal-based carbon, zeolite, silica gel, meerschaum, aluminum oxide, a coal-based charcoal made from semi-anthracite coal, a carbonaceous resin derived from the pyrolysis of sulfonated styrene-divinylbenzene, or combinations thereof, said fibrous filter plug, said selective adsorbent section, and said general adsorbent section being co-axially aligned in tandem.

A multiple section cigarette filter comprising:

• (a) a fibrous filter plug selected from the group consisting of cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or a combination thereof;
• (b) a selective adsorbent section comprising an ion-exchange resin having a phenol-formaldehyde resin matrix that is surface-functionalized with primary and secondary amine groups, said resin being dispersed throughout a fibrous material;
• and
• (c) a general adsorbent section comprising a general adsorbent material selected from the group consisting of activated charcoal, activated coconut carbon, activated coal-based carbon, zeolite, silica gel, meerschaum, aluminum oxide, a coal-based charcoal made from semi-anthracite coal, a carbonaceous resin derived from the pyrolysis of sulfonated styrene-divinylbenzene, or combinations thereof, said fibrous filter plug, said selective adsorbent section, and said general adsorbent section being co-axially aligned in tandem.

A cigarette filter comprising:

• (a) a preselected length of fibrous material;
• (b) a selective adsorbent material dispersed throughout a first preselected selection along said preselected length, said selective absorbent material having an affinity for a predetermined class of chemical compounds dispersed throughout a fibrous material;
• and
• (c) a general adsorbent material dispersed throughout a second preselected section along said preselected length, said general adsorbent material having a high surface area and being capable of adsorbing smoke constituents without a high degree of specificity.