Cigarette filter
AssigneeBrown & Williamson Tobacco Corporation
InventorsJames N. Figlar, Brian E. Tucker, F. Kelley St. Charles
Life of this patent
Estimating the term…
Abstract
A cigarette filter includes a multiple section filter which reduces the level of predetermined smoke constituents. The filter includes a fibrous filter plug section, a selective adsorbent section, and a general adsorbent section co-axially aligned in tandem. The selective adsorbent section includes a selective absorbent material which is a phenol-formaldehyde resin matrix surface-functionalized with mainly primary and secondary amine functional groups which removes specific smoke constituents from the tobacco smoke. The general adsorbent section is a material capable of adsorbing a range of chemical compounds without a high degree of specificity.
Claims10
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;
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- (c) a filter plug, said general adsorbent section being axially aligned in tandem between said filter plug and said selective adsorbent section.
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, said selective adsorbent material being an ion-exchange resin, said ion-exchange resin being a phenol formaldehyde resin matrix end is surface-functionalized with primary and secondary amine groups;
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- (c) 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, dispersed throughout a second preselected section along said preselected length, said general adsorbent material having a high surface area end being capable of adsorbing smoke constituents without a high degree of specificity, said general adsorbent section being axially aligned in tandem between said fibrous material and said selective adsorbent section.
Dependencies are inferred from the claim text.