Claims
- 1. A multiple section cigarette filter comprising:
(a) 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 (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 selective adsorbent section and said general adsorbent section being co-axially aligned in tandem.
- 2. The cigarette filter of claim 1 wherein said general adsorbent material is 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.
- 3. The cigarette filter of claim 2 wherein said general adsorbent section further includes a metal oxide or other metal-based complex.
- 4. The cigarette filter of claim 1 including a fibrous filter plug wherein said filter plug is made from cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or a combination thereof, said fibrous filter plug being co-axially aligned in tandem with said selective adsorbent section and said general adsorbent section.
- 5. The cigarette filter of claim 4 wherein said filter plug further includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
- 6. The cigarette filter of claim 4 wherein said general adsorbent section is positioned between said fibrous filter plug and said selective adsorbent section.
- 7. The cigarette filter of claim 4 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
- 8. The cigarette filter of claim 4 wherein said filter plug is made from cellulose acetate tow, said selective adsorbent material is an ion-exchange resin having a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups, and said general adsorbent section comprises activated coconut charcoal dispersed throughout plasticizer-treated cellulose acetate tow.
- 9. The cigarette filter of claim 8 wherein said general adsorbent is positioned between said fibrous filter plug and said selective adsorbent section.
- 10. The cigarette filter of claim 8 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
- 11. The cigarette filter of claim 4 wherein said filter plug is made from cellulose acetate tow, said selective adsorbent material is an ion-exchange resin having a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups, and said general adsorbent section comprises mineral-based charcoal made from semi-anthracite coal dispersed throughout plasticizer-treated cellulose acetate tow.
- 12. The cigarette filter of claim 11 wherein said general adsorbent is positioned between said fibrous filter plug and said selective adsorbent section.
- 13. The cigarette filter of claim 11 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
- 14. The cigarette filter of claim 4, said fibrous filter plug being positioned between said selective adsorbent section and said general adsorbent section.
- 15. The cigarette filter of claim 1, said selective absorbent material having a surface area greater than about 35 m2/g.
- 16. The cigarette filter of claim 1 including a plug wrap circumscribing said general adsorbent section and said selective adsorbent section.
- 17. A multiple section cigarette filter comprising:
(a) a fibrous filter plug; (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.
- 18. The cigarette filter of claim 17 wherein said general adsorbent section further includes an additive selected from a metal oxide or another metal-based complex.
- 19. The cigarette filter of claim 17 wherein said general adsorbent material is dispersed throughout a fibrous material.
- 20. The cigarette filter of claim 17 wherein said general adsorbent section comprises a close-packed bed of said general adsorbent material.
- 21. The cigarette filter of claim 17 wherein said filter plug is made from cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or a combination thereof.
- 22. The cigarette filter of claim 17 wherein said filter plug further includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
- 23. The cigarette filter of claim 17 wherein said general adsorbent section is positioned between said fibrous filter plug and said selective adsorbent section.
- 24. The cigarette filter of claim 17 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
- 25. The cigarette filter of claim 17 wherein said filter plug is made from cellulose acetate tow, said selective adsorbent material is an ion-exchange resin having a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups, and said general adsorbent section comprises activated coconut charcoal dispersed throughout plasticizer-treated cellulose acetate tow.
- 26. The cigarette filter of claim 17 wherein said filter plug is made from cellulose acetate tow, said selective adsorbent material is an ion-exchange resin having a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups, and said general adsorbent section comprises bituminous-based charcoal made from semi-anthracite coal dispersed throughout plasticizer-treated cellulose acetate tow.
- 27. The cigarette filter of claim 17, said selective absorbent material having a surface area greater than 35 m2/g.
- 28. The cigarette filter of claim 17, said fibrous filter plug being positioned between said selective adsorbent section and said general adsorbent section.
- 29. The cigarette filter of claim 21 wherein said general adsorbent section is positioned between said fibrous filter plug and said selective adsorbent section.
- 30. The cigarette filter of claim 21 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
- 31. The cigarette filter of claim 21, said selective absorbent material having a surface area greater than 35 m2/g.
- 32. The cigarette filter of claim 21, said fibrous filter plug being positioned between said selective adsorbent section and said general adsorbent section.
- 33. The cigarette filter of claim 21, said filter plug, said selective adsorbent section, and said general adsorbent section being circumscribed with a plug wrap.
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
[0001] This application claims priority from U.S. Provisional Application Ser. No. 60/309,388, filed Aug. 1, 2001, which application is incorporated herein by reference in its entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60309388 |
Aug 2001 |
US |