Claims
- 1. 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.
- 2. The cigarette falter of claim 1 wherein said general adsorbent section comprises said general adsorbent material dispersed throughout a fibrous material.
- 3. The cigarette filter of claim 1 wherein said general adsorbent section comprises a dose-packed bed of said general adsorbent material.
- 4. The cigarette filter of claim 1 wherein said general adsorbent section further includes a metal oxide or other metal-based complex.
- 5. The cigarette filter of claim 1, said filter plug being a fibrous filter plug made from cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or a combination thereof.
- 6. The cigarette filter of claim 5 wherein said filter plug further includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
- 7. The cigarette filter of claim 1, said selective absorbent material having a surface area greater than about 35 m2/g.
- 8. 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; and (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.
- 9. The cigarette filter of claim 8 wherein said general adsorbent material further includes a metal oxide or other metal-based complex.
- 10. The cigarette filter of claim 8 wherein said fibrous material includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
This application claims priority from U.S. Provisional Application Ser. No. 60/309,435, filed Aug. 1, 2001, which application is incorporated herein by reference in its entirety.
US Referenced Citations (35)
Provisional Applications (1)
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Number |
Date |
Country |
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60/309435 |
Aug 2001 |
US |