Patent ID: 6779529
Filing Date: 2004-08-24
Classification: A24D

Abstract:
A multiple section cigarette filter comprising:(a) a selective adsorbent section comprising a selective adsorbent material which is an ion-exchange resin having an affinity for a predetermined class of chemical compounds dispersed throughout a fibrous material, said ion-exchange resin being a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups; (b) a general adsorbent section comprising a general adsorbent material having a high surface area and being capable of adsorbing smoke constituents without a high degree of specificity, said general adsorbent material being 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; and (c) a filter plug, said general adsorbent section being axially aligned in tandem between said filter plug and said selective adsorbent section.