US20040237984A1 - Cigarette filter - Google Patents

Cigarette filter Download PDF

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Publication number
US20040237984A1
US20040237984A1 US10/485,479 US48547904A US2004237984A1 US 20040237984 A1 US20040237984 A1 US 20040237984A1 US 48547904 A US48547904 A US 48547904A US 2004237984 A1 US2004237984 A1 US 2004237984A1
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section
filter
cigarette filter
general
selective
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US10/485,479
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James Figlar
Brian Tucker
F St Charles
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Brown and Williamson Holdings Inc
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Individual
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Priority to US10/485,479 priority Critical patent/US20040237984A1/en
Assigned to BROWN & WILLIAMSON TOBACCO CORPORATION reassignment BROWN & WILLIAMSON TOBACCO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ST. CHARLES, F. KELLEY, FIGLAR, JAMES N., TUCKER, BRIAN E.
Publication of US20040237984A1 publication Critical patent/US20040237984A1/en
Assigned to JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: R.J. REYNOLDS TOBACCO COMPANY
Abandoned legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/16Use of materials for tobacco smoke filters of inorganic materials
    • A24D3/163Carbon
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/12Use of materials for tobacco smoke filters of ion exchange materials
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/16Use of materials for tobacco smoke filters of inorganic materials

Definitions

  • the present invention relates to a cigarette filter that includes a smoke constituent adsorbent which, when combined with a carbon-based filtering material, demonstrates synergistic reductions in smoke vapor constituents.
  • Cigarettes include tobacco rods or columns which, when burned, produce a particulate and a vapor phase.
  • filters began to be attached to an end of the tobacco column.
  • the filter removed various smoke components.
  • the fibrous materials are not effective at removing volatile constituents, such as aldehydes, hydrogen cyanide and sulfides, which are found in the vapor phase.
  • an adsorbent or absorbent is combined with the fibrous material to improve removal of the vapor phase components.
  • cigarette filters have included activated carbon, porous minerals such as meerschaum, silica gel, cation-exchange resins and anion-exchange resins.
  • Charcoal has a high specific surface area and is a relatively strong adsorbent for vapor-phase constituents of tobacco smoke. When coated with a mixture of metallic oxides, charcoal is particularly effective in removing acidic gases. Meerschaum has a large adsorption area with a strong adsorption affinity for charged species, but a considerably low adsorption affinity for non-polar species. Silica gels are generally regarded as weakly retentive adsorbents for vapor-phase constituents of tobacco smoke. Although silica gel readily adsorbs aldehydes and hydrogen cyanide, the constituents also readily desorb from the silica gel. Cation exchange resins have been proposed for nicotine removal.
  • Anion exchange resins have been proposed for the removal of smoke acids, but strongly basic anion exchangers have no effect on smoke vapor phase aldehydes.
  • Weakly basic anion-exchange resins of porous structure are suitable for the removal of smoke acids and aldehydes, but their efficiency diminishes during smoking, as does that of carbon and porous minerals.
  • adsorbents can be used in combination in cigarette filters.
  • U.S. Pat. No.2,815,760 describes the use of an ion exchange material with materials which “chemically react with the harmful, nonalkaline and nonacid components of the smoke to form non-volatile compounds, thus retaining the latter to the filter.”
  • the aforesaid additives have not yielded satisfactory selective removal of such smoke phase components, as smoke aldehydes, particularly acetaldehyde and acrolein.
  • smoke aldehydes particularly acetaldehyde and acrolein.
  • No.4,300,577 describes the use of a weakly retentive absorbent for vapor-phase constituents intermingled with a second component having mainly primary amino functional groups for the removal of vapor-phase constituents, including aldehydes and hydrogen cyanide from tobacco smoke.
  • a second component having mainly primary amino functional groups for the removal of vapor-phase constituents, including aldehydes and hydrogen cyanide from tobacco smoke.
  • the filter of the '577 patent has not been shown to demonstrate adequate consumer acceptance or commercial viability.
  • the present invention relates to a cigarette filter that includes a multiple section filter which reduces the level of predetermined smoke constituents.
  • the filter consists of a fibrous filter plug located at the mouth-end of the cigarette, a section containing a selective adsorbent material, and a section containing a general adsorbent material.
  • the filter plug can be any filter plug known in the art, such as cellulose acetate tow.
  • the general adsorbent material is preferably selected from a group of relatively high surface area materials, such as activated charcoal, which are capable of adsorbing a range of chemical compounds without a high degree of specificity.
  • the selective adsorbent material is chosen based on the specific smoke constituents targeted for removal.
  • the selective adsorbent material is selected from a group of surface functionalized resins, wherein each resin consists of an essentially inert carrier with a surface area of greater than about 35 m 2 /g.
  • the selective adsorbent material has a phenol-formaldelhyde resin matrix surface-functionalized with mainly primary and secondary amine functional groups.
  • the selective adsorbent material may be adjacent to a tobacco rod and the general adsorbent material positioned between the selective adsorbent section and the filter plug.
  • the general adsorbent material may be positioned adjacent to the tobacco rod and the selective adsorbent material between the general adsorbent section and the filter plug.
  • the selective adsorbent and general adsorbent may be interspersed in a traditional filter plug material, such as cellulose acetate, or the adsorbents may be packed as a bed or thin layer sections within filter plug material.
  • FIG. 1 is a perspective view of a prior art filter-tipped cigarette
  • FIG. 2 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are dispersed throughout a filter plug material, and the general adsorbent section is positioned between the filter plug and the selective adsorbent section;
  • FIG. 3 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are dispersed throughout a filter plug material, and the selective adsorbent section is positioned between the filter plug and the general adsorbent section;
  • FIG. 4 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are packed as beds within a segment of a filter plug material;
  • FIG. 5 is a cross-sectional view of an embodiment of the present invention with the filter plug disposed between the general adsorbent section and the selective adsorbent section;
  • FIG. 6 is a cross-sectional view of an embodiment of the present invention with the filter plug adjacent one end of a tobacco rod;
  • FIG. 7 is a cross-sectional view of an embodiment of the present invention with the adsorbents being sectionalized in a single length of fibrous filter material;
  • FIG. 8 is a cross-sectional view of an enmbodiment of the present invention absent a filter plug section.
  • the cigarette filter of the present invention includes a multiple section filter which reduces the levels of predetermined smoke constituents.
  • the filter consists of a fibrous filter plug located at the mouth-end of the cigarette, a section containing a selective adsorbent material, and a section containing a general adsorbent material.
  • a typical filter-tipped cigarette 10 has a filter 30 attached to a tobacco rod 20 .
  • the tobacco rod 20 consists of a loose tobacco-containing mixture 22 wrapped in a cigarette paper 24
  • the filter 30 includes a filter plug 32 wrapped in a plug wrap 34 .
  • a sheet of tipping paper 36 joins the filter 30 to the tobacco rod 20 .
  • a cigarette 110 has a multiple section filter 130 attached to the tobacco rod 20 .
  • the filter 130 includes a filter plug 132 , a section containing a general adsorbent 134 and a section containing a selective adsorbent 136 .
  • the filter plug 132 is adjacent a first or mouth end 131 of the filter 130 .
  • the bed of the selective adsorbent 136 is adjacent a second or tobacco-rod end 137 of the filter 130 .
  • the bed of the general adsorbent 134 is positioned between the filter plug 132 and the selective adsorbent bed 136 .
  • the filter plug 132 is made from a filamentary or fibrous material and provides a clean, neat appearance at the mouth end 131 of the cigarette.
  • the filter plug 132 also retains a firmness at the mouth end 131 as the cigarette 110 is consumed.
  • the filter plug 132 can be made from a variety of materials, among the most common being cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or combinations thereof.
  • a plasticizer may be included.
  • the general adsorbent section 134 includes a general adsorbent material 144 dispersed throughout a filter plug material 142 , such as in a “dual-dalmatian” filter, known in the art.
  • the general adsorbent material 144 is preferably selected from a group of relatively high surface area materials which are capable of adsorbing smoke constituents without a high degree of specificity.
  • the general adsorbent can be selected from activated charcoal, activated coconut carbon, activated coal-based carbon, zeolite, silica gel, meerschaum, aluminum oxide, or combining thereof, as well as a mineral-based charcoal made from semi-anthracite coal with a density about 50% greater than coconut-based charcoal (available from Calgon Carbon, Pittsburgh, Pa.), Ambersorb 572 or Ambersorb 563 (a carbonaceous resin derived from the pyrolysis of sulfonated styrene-divinylbenzene available from Rohm and Haas, 5000 Richmond Street, Philadelphia, Pa. 19137), other materials having similar particle sizes, surface area and binding affinities, or combinations thereof.
  • metal oxides or other metal-based complexes may be included in the general adsorbent section.
  • the selective adsorbent section 136 includes a selective adsorbent material 146 dispersed throughout a filter plug material 142 , such as in a “dual-dalmatian” filter, known in the art.
  • the selective adsorbent material 146 is preferably selected based on the material's 146 specificity for a predetermined class of chemical compounds.
  • the selective adsorbent material 146 may be an ion-exchange resin, such as Duolite A7 (available from Rohm and Haas, 5000 Richmond Street, Philadelphia, Pa. 19137), or a material having similar functional groups and binding affinities.
  • the Duolite A7 has a phenol-formaldehyde rsin matrix and is surface-functionalized with primary and secondary amino groups, thereby enhancing the resin's specificity toward the aldehydes and hydrogen cyanide found in tobacco smoke.
  • the selective adsorbent material 146 must be selected taking into consideration that the contact conditions between the tobacco smoke and the adsorbent 146 are dependent on a number of variables, including how strongly the smoker pulls the smoke through the filter as the cigarette is being smoked and how much of the tobacco rod has been consumed prior to each puff.
  • the selective adsorbent 146 have a surface area of greater than about 35 m 2 /g so that there is minimal diffusional resistance and the surface area functional sites are easily accessible. Materials with greater surface areas also demonstrate less noticeable performance decline if part of the surface is covered with a plasticizer, as might occur when the adsorbent 146 is dispersed in the filter plug 142 .
  • the tobacco smoke is puffed by the smoker through the filter 130 .
  • the smoke initially passes over the selective adsorbent section 136 where the targeted smoke constituents are adsorbed on the surface of the selective adsorbent material 146 and particulate matter in the smoke is retained by the filter plug material 142 .
  • the remaining smoke then passes over the general adsorbent section 134 where other constituents may be retained by the adsorbent material 144 and additional particulate matter is retained by the filter plug material 142 .
  • the remaining smoke then passes through the filter plug 132 where additional particulate matter can be removed.
  • the filtered smoke is then delivered to the smoker.
  • the multiple section filter 110 is made having a filter plug 132 made of cellulose acetate tow and being about 7 mm in length, and having a general adsorbent section 134 consisting of 40 mg of activated coconut charcoal 144 dispersed throughout cellulose acetate tow 142 cut to deliver a section 134 about 10 mm in length wherein the cellulose acetate tow is treated with a plasticizer, and having a selective adsorbent section 136 consisting of 40 mg of Duolite A7 dispersed throughout cellulose acetate tow 142 cut to deliver a section 136 about 10 mm in length wherein the cellulose acetate tow is treated with a plasticizer.
  • the multiple section filter 130 has the filter plug 132 adjacent the mouth end 131 , the selective adsorbent section 136 adjacent the tobacco-rod end 137 , and the general adsorbent section 134 positioned between the filter plug 132 and the selective adsorbent section 136 .
  • a cigarette 210 has a multiple section filter 230 wherein the filter plug 132 is positioned at the mouth end 131 , the general adsorbent section 134 is adjacent the tobacco-rod end 137 , and the selective adsorbent section 136 is sandwiched between the filter plug 132 and the general adsorbent section 134 .
  • the smoke first passes through the general adsorbent section 134 , then through the selective adsorbent section 136 , and finally through the filter plug 132 .
  • the multiple section filter 230 is essentially identical to the filter 130 (FIG.
  • a multi-section filter 630 for a cigarette 610 includes the general adsorbent 344 and the selective adsorbent 346 dispersed in separate sections within a single length of fibrous filter material 342 .
  • An advantage of the embodiment 110 of FIG. 2 is that the smoke passes over the selective adsorbent material 146 before passing over the general adsorbent 144 .
  • This allows the selective adsorbent 146 to remove some specific smoke constituents before the general adsorbent 144 is exposed to the smoke, thereby allowing the general adsorbent 144 to be more effective in removing the remaining smoke constituents.
  • a multiple section filter 730 of a cigarette 710 includes only a general absorbent section 134 and a selective absorbent section 136 .
  • a cigarette 110 with a multiple section filter 130 is prepared as shown in FIG. 2 wherein a filter plug 132 is made of cellulose acetate tow and is about 7 mm in length, a general adsorbent section 134 consists of about 40 mg of activated coconut charcoal 144 dispersed throughout plasticizer-treated cellulose acetate tow 142 cut to deliver a section 134 about 10 mm in length, and a selective adsorbent section 136 consists of about 40 mg of Duolite A7 dispersed throughout plasticizer-treated cellulose acetate tow 142 cut to deliver a section 136 about 10 mm in length.
  • the filter is attached to a tobacco rod having a length of about 56.5 mm and containing about 617 mg of a typical non-menthol cigarette blend wrapped in a 50 Coresta cigarette paper with about 1.8% citrate.
  • the cigarette delivers about 10.3 mg tar per cigarette.
  • a cigarette 210 with a multiple section filter 230 is prepared with the section orientations as shown in FIG. 3 wherein the filter plug 132 , the general adsorbent section 134 , and the selective adsorbent section 136 are essentially identical to the filter plug 132 , the general adsorbent section 134 , and the selective adsorbent section 136 of Example 1.
  • the filter is attached to a tobacco rod having a length of about 56.5 mm and containing about 617 mg of a typical non-menthol cigarette blend wrapped in a 50 Coresta cigarette paper with about 1.8% citrate.
  • the cigarette delivers about 10.0 mg tar per cigarette.
  • Cigarettes are prepared as in Example 1 except that about 20 mg Duolite A7 is used in the selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.2 mg tar per cigarette.
  • Cigarettes are prepared as in Example 2 except that about 20 mg Duolite A7 is used in the selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.9 mg tar per cigarette.
  • Cigarettes are prepared as in Example 1 except that about 60 mg Duolite A7 is used in the selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.0 mg tar per cigarette.
  • Cigarettes are prepared as in Example 2 except that about 60 mg Duolite A7 is used in the selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.3 mg tar per cigarette.
  • Cigarettes are prepared as in Example 1 except that about 69 mg of a mineral-based charcoal made from semi-anthracite coal is used in the general adsorbent section 136 instead of 40 mg of activated coconut charcoal.
  • the cigarette delivers about 10.1 mg tar per cigarette.
  • Cigarettes are prepared as in Example 2 except that about 69 mg of a mineral-based charcoal made from semi-anthracite coal is used in the general adsorbent section 136 instead of 40 mg of activated coconut charcoal.
  • the cigarette delivers about 10.2 mg tar per cigarette.
  • Representative cigarettes of Examples 1-6 are smoked to a butt length of about 4 mm from the tipping using a Borgwalt RM-20 smoking machine. Following the procedures set forth by the FTC, smoke constituents exiting the filter end of each cigarette are passed through a Cambridge filter pad, the vapor phase is collected in a bag and analyzed by GC/MS. The data is normalized to about 10 mg tar per cigarette.
  • Representative cigarettes of Examples 7 and 8 are smoked to a butt length of about 4 mm from the tipping using a Borgwalt RM-20 smoking machine. Following the procedures set forth by the FTC, smoke constituents exiting the filter end of each cigarette are passed through a Cambridge filter pad, the vapor phase is collected in a bag and analyzed by GC/MS. The data is normalized to about 10 mg tar per cigarette.
  • the adsorbents 144 , 146 may be packed within the filter plug material 142 as thin layer sections of general adsorbent 344 and selective adsorbent 346 . Because the layer packed adsorbents would not be exposed to the same level of plasticizer as the tow-dispersed adsorbents, the adsorbents would retain more available surface area for interacting with smoke constituents.
  • the filter plug, the general adsorbent section, and the selective adsorbent section may vary in length and diameter, relative to any dimensions specified herein and relative to each other.
  • the various section dimensions may be optimized for a particular tobacco blend or for particular tobacco rod dimensions.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

A cigarette filter that includes a multiple section filter which reduces the level of predetermined smoke constituents. The filter (130) consists of a fibrous filter plug (132) located at the mouth-end of the cigarette, a section (136) containing a selective adsorbent material, and a section (134) containing a general adsorbent material. The selective adsorbent material, such as a phenol-formaldchyde resin matrix surface-functionalized with mainly primary and secondary amine functional groups, removes specific smoke constituents from the tobacco smoke. The general adsorbent material, such as activated charcoal, is preferably capable of adsorbing a range of chemical compounds without a high degree of specificity. Structurally, the fibrous filter plug, the selective adsorbent section, and the general adsorbent section are co-axially aligned it tandem.

Description

    CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
  • This application claims priority from U.S. Provisional Application Ser. No. 60/309,38S, filed Aug. 1, 2001, which application is incorporated herein by reference in its entirety, from U.S. Provisional Application Ser. No. 60/309,435, filed Aug.1, 2001, which application is incorporated herein by reference in its entirety and U.S. patent application Ser. No. 10/011,841, filed Oct.30, 2001.[0001]
  • BACKGROUND OF THE INVENTION
  • The present invention relates to a cigarette filter that includes a smoke constituent adsorbent which, when combined with a carbon-based filtering material, demonstrates synergistic reductions in smoke vapor constituents. [0002]
  • Cigarettes include tobacco rods or columns which, when burned, produce a particulate and a vapor phase. About 70 years ago, filters began to be attached to an end of the tobacco column. Among other things, the filter removed various smoke components. Filters made from filamentary or fibrous material, such as cellulose acetate tow or paper, remove the particulate phase of tobacco smoke by mechanical means. However, the fibrous materials are not effective at removing volatile constituents, such as aldehydes, hydrogen cyanide and sulfides, which are found in the vapor phase. Typically, an adsorbent or absorbent is combined with the fibrous material to improve removal of the vapor phase components. For example, cigarette filters have included activated carbon, porous minerals such as meerschaum, silica gel, cation-exchange resins and anion-exchange resins. [0003]
  • Charcoal has a high specific surface area and is a relatively strong adsorbent for vapor-phase constituents of tobacco smoke. When coated with a mixture of metallic oxides, charcoal is particularly effective in removing acidic gases. Meerschaum has a large adsorption area with a strong adsorption affinity for charged species, but a considerably low adsorption affinity for non-polar species. Silica gels are generally regarded as weakly retentive adsorbents for vapor-phase constituents of tobacco smoke. Although silica gel readily adsorbs aldehydes and hydrogen cyanide, the constituents also readily desorb from the silica gel. Cation exchange resins have been proposed for nicotine removal. Anion exchange resins have been proposed for the removal of smoke acids, but strongly basic anion exchangers have no effect on smoke vapor phase aldehydes. Weakly basic anion-exchange resins of porous structure are suitable for the removal of smoke acids and aldehydes, but their efficiency diminishes during smoking, as does that of carbon and porous minerals. [0004]
  • Two or more adsorbents can be used in combination in cigarette filters. For example, U.S. Pat. No.2,815,760 describes the use of an ion exchange material with materials which “chemically react with the harmful, nonalkaline and nonacid components of the smoke to form non-volatile compounds, thus retaining the latter to the filter.” However, the aforesaid additives have not yielded satisfactory selective removal of such smoke phase components, as smoke aldehydes, particularly acetaldehyde and acrolein. U.S. Pat. No.4,300,577 describes the use of a weakly retentive absorbent for vapor-phase constituents intermingled with a second component having mainly primary amino functional groups for the removal of vapor-phase constituents, including aldehydes and hydrogen cyanide from tobacco smoke. However, the filter of the '577 patent has not been shown to demonstrate adequate consumer acceptance or commercial viability. [0005]
  • SUMMARY OF THE INVENTION
  • The present invention relates to a cigarette filter that includes a multiple section filter which reduces the level of predetermined smoke constituents. The filter consists of a fibrous filter plug located at the mouth-end of the cigarette, a section containing a selective adsorbent material, and a section containing a general adsorbent material. [0006]
  • The filter plug can be any filter plug known in the art, such as cellulose acetate tow. The general adsorbent material is preferably selected from a group of relatively high surface area materials, such as activated charcoal, which are capable of adsorbing a range of chemical compounds without a high degree of specificity. The selective adsorbent material is chosen based on the specific smoke constituents targeted for removal. Preferably, the selective adsorbent material is selected from a group of surface functionalized resins, wherein each resin consists of an essentially inert carrier with a surface area of greater than about 35 m[0007] 2/g. In an embodiment of the present invention, the selective adsorbent material has a phenol-formaldelhyde resin matrix surface-functionalized with mainly primary and secondary amine functional groups.
  • Structurally, the selective adsorbent material may be adjacent to a tobacco rod and the general adsorbent material positioned between the selective adsorbent section and the filter plug. Alternatively, the general adsorbent material may be positioned adjacent to the tobacco rod and the selective adsorbent material between the general adsorbent section and the filter plug. Preliminary data indicates that the former orientation produces a synergistic effect in smoke constituent reductions relative to the latter orientation. Further, the selective adsorbent and general adsorbent may be interspersed in a traditional filter plug material, such as cellulose acetate, or the adsorbents may be packed as a bed or thin layer sections within filter plug material.[0008]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of a prior art filter-tipped cigarette; [0009]
  • FIG. 2 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are dispersed throughout a filter plug material, and the general adsorbent section is positioned between the filter plug and the selective adsorbent section; [0010]
  • FIG. 3 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are dispersed throughout a filter plug material, and the selective adsorbent section is positioned between the filter plug and the general adsorbent section; [0011]
  • FIG. 4 is a perspective view of a filter for a cigarette made in accordance with the present invention wherein the adsorbents are packed as beds within a segment of a filter plug material; [0012]
  • FIG. 5 is a cross-sectional view of an embodiment of the present invention with the filter plug disposed between the general adsorbent section and the selective adsorbent section; [0013]
  • FIG. 6 is a cross-sectional view of an embodiment of the present invention with the filter plug adjacent one end of a tobacco rod; [0014]
  • FIG. 7 is a cross-sectional view of an embodiment of the present invention with the adsorbents being sectionalized in a single length of fibrous filter material; and, [0015]
  • FIG. 8 is a cross-sectional view of an enmbodiment of the present invention absent a filter plug section.[0016]
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The cigarette filter of the present invention includes a multiple section filter which reduces the levels of predetermined smoke constituents. The filter consists of a fibrous filter plug located at the mouth-end of the cigarette, a section containing a selective adsorbent material, and a section containing a general adsorbent material. [0017]
  • As shown in FIG. 1 and as is known in the art, a typical filter-tipped [0018] cigarette 10 has a filter 30 attached to a tobacco rod 20. The tobacco rod 20 consists of a loose tobacco-containing mixture 22 wrapped in a cigarette paper 24, and the filter 30 includes a filter plug 32 wrapped in a plug wrap 34. A sheet of tipping paper 36 joins the filter 30 to the tobacco rod 20.
  • In the present invention, as shown in FIG. 2, a [0019] cigarette 110 has a multiple section filter 130 attached to the tobacco rod 20. The filter 130 includes a filter plug 132, a section containing a general adsorbent 134 and a section containing a selective adsorbent 136. The filter plug 132 is adjacent a first or mouth end 131 of the filter 130. The bed of the selective adsorbent 136 is adjacent a second or tobacco-rod end 137 of the filter 130. The bed of the general adsorbent 134 is positioned between the filter plug 132 and the selective adsorbent bed 136.
  • The [0020] filter plug 132 is made from a filamentary or fibrous material and provides a clean, neat appearance at the mouth end 131 of the cigarette. The filter plug 132 also retains a firmness at the mouth end 131 as the cigarette 110 is consumed. As is known in the art, the filter plug 132 can be made from a variety of materials, among the most common being cellulose, cellulose acetate tow, paper, cotton, polypropylene web, polypropylene tow, polyester web, polyester tow or combinations thereof. Optionally, a plasticizer may be included.
  • The [0021] general adsorbent section 134 includes a general adsorbent material 144 dispersed throughout a filter plug material 142, such as in a “dual-dalmatian” filter, known in the art. The general adsorbent material 144 is preferably selected from a group of relatively high surface area materials which are capable of adsorbing smoke constituents without a high degree of specificity. For example, the general adsorbent can be selected from activated charcoal, activated coconut carbon, activated coal-based carbon, zeolite, silica gel, meerschaum, aluminum oxide, or combining thereof, as well as a mineral-based charcoal made from semi-anthracite coal with a density about 50% greater than coconut-based charcoal (available from Calgon Carbon, Pittsburgh, Pa.), Ambersorb 572 or Ambersorb 563 (a carbonaceous resin derived from the pyrolysis of sulfonated styrene-divinylbenzene available from Rohm and Haas, 5000 Richmond Street, Philadelphia, Pa. 19137), other materials having similar particle sizes, surface area and binding affinities, or combinations thereof. To further enhance the efficacy of the general adsorbent, metal oxides or other metal-based complexes may be included in the general adsorbent section.
  • The [0022] selective adsorbent section 136 includes a selective adsorbent material 146 dispersed throughout a filter plug material 142, such as in a “dual-dalmatian” filter, known in the art. The selective adsorbent material 146 is preferably selected based on the material's 146 specificity for a predetermined class of chemical compounds. For example, the selective adsorbent material 146 may be an ion-exchange resin, such as Duolite A7 (available from Rohm and Haas, 5000 Richmond Street, Philadelphia, Pa. 19137), or a material having similar functional groups and binding affinities. The Duolite A7 has a phenol-formaldehyde rsin matrix and is surface-functionalized with primary and secondary amino groups, thereby enhancing the resin's specificity toward the aldehydes and hydrogen cyanide found in tobacco smoke.
  • Further, the [0023] selective adsorbent material 146 must be selected taking into consideration that the contact conditions between the tobacco smoke and the adsorbent 146 are dependent on a number of variables, including how strongly the smoker pulls the smoke through the filter as the cigarette is being smoked and how much of the tobacco rod has been consumed prior to each puff. Thus, it is advantageous that the selective adsorbent 146 have a surface area of greater than about 35 m2/g so that there is minimal diffusional resistance and the surface area functional sites are easily accessible. Materials with greater surface areas also demonstrate less noticeable performance decline if part of the surface is covered with a plasticizer, as might occur when the adsorbent 146 is dispersed in the filter plug 142.
  • When the cigarette is consumed, the tobacco smoke is puffed by the smoker through the [0024] filter 130. The smoke initially passes over the selective adsorbent section 136 where the targeted smoke constituents are adsorbed on the surface of the selective adsorbent material 146 and particulate matter in the smoke is retained by the filter plug material 142. The remaining smoke then passes over the general adsorbent section 134 where other constituents may be retained by the adsorbent material 144 and additional particulate matter is retained by the filter plug material 142. Finally, the remaining smoke then passes through the filter plug 132 where additional particulate matter can be removed. The filtered smoke is then delivered to the smoker.
  • In a first example embodiment of the present invention, as shown in FIG. 2, the [0025] multiple section filter 110 is made having a filter plug 132 made of cellulose acetate tow and being about 7 mm in length, and having a general adsorbent section 134 consisting of 40 mg of activated coconut charcoal 144 dispersed throughout cellulose acetate tow 142 cut to deliver a section 134 about 10 mm in length wherein the cellulose acetate tow is treated with a plasticizer, and having a selective adsorbent section 136 consisting of 40 mg of Duolite A7 dispersed throughout cellulose acetate tow 142 cut to deliver a section 136 about 10 mm in length wherein the cellulose acetate tow is treated with a plasticizer. When the tobacco rod is burned with a normal puff/rest cycle, analysis of the smoke vapor exiting at the mouth end 131 of the cigarette 110 shows statistically significant reductions in the levels of hydrogen cyanide, furan, propionaldehyde, acetone, methyl ethyl ketone/butyraldehyde, hydrogen sulfide, 1,3-butadiene, 2-methylpropanal, isoprene, styrene, pyridine, toluene and benzene as compared to cigarettes using similar resin-only filters. When the tobacco rod is burned with a normal puff/rest cycle, analysis of the smoke vapor exiting at the mouth end 131 of the cigarette 110 shows statistically significant reductions in the levels of pyridine, hydrogen cyanide, hydrogen sulfide, styrene, 2-methylpropanal, benzene, propionaldehyde, furan, isoprene, 1,3-butadiene, crotonaldehyde, acetone, acrylonitrile, acetaldehyde, toluene, carbon disulfide, methyl ethyl ketone/butyraldehyde, propionaldehyde, acetonitrile, and methanol as compared to cigarettes using charcoal-only filters.
  • As shown in FIG. 2, the [0026] multiple section filter 130 has the filter plug 132 adjacent the mouth end 131, the selective adsorbent section 136 adjacent the tobacco-rod end 137, and the general adsorbent section 134 positioned between the filter plug 132 and the selective adsorbent section 136.
  • In an alternative embodiment, such as shown in FIG. 3, a [0027] cigarette 210 has a multiple section filter 230 wherein the filter plug 132 is positioned at the mouth end 131, the general adsorbent section 134 is adjacent the tobacco-rod end 137, and the selective adsorbent section 136 is sandwiched between the filter plug 132 and the general adsorbent section 134. In this embodiment, during a normal puff, the smoke first passes through the general adsorbent section 134, then through the selective adsorbent section 136, and finally through the filter plug 132. Moreover, the multiple section filter 230 is essentially identical to the filter 130 (FIG. 2) of the first example embodiment except that the general adsorbent section 134 is adjacent to the tobacco rod 20 and the selective adsorbent section 136 is sandwiched between the filter plug 132 and the general adsorbent section 134. When the tobacco rod is burned with a normal puff/rest cycle, analysis of the smoke vapor exiting at the mouth end 131 of the cigarette 210 (FIG. 3) shows statistically significant reductions in the levels of propionaldehyde, acetone, methyl ethyl ketone/butyraldehyde, crotonaldehyde, hydrogen sulfide, 2-methylpropanal, pyridine, acrolein, toluene, acetaldehyde, acrylonitrile, methanol and benzene as compared to cigarettes using similar resin-only filters. When the tobacco rod is burned with a normal puff/rest cycle, analysis of the smoke vapor exiting at the mouth end 131 of the cigarette 210 shows statistically significant reductions in the levels of pyridine, hydrogen cyanide, benzene, propionitrile, crotonaldehyde, acetone, acrylonitrile, acetaldehyde, toluene, carbon disulfide, methyl ethyl ketone/butyraldehyde, propionaldehyde, acetonitrile, and methanol as compared to cigarettes using charcoal-only filters.
  • As shown in another embodiment in FIG. 4, in a [0028] multiple section filter 330 of a cigarette 310, the absorbents 144, 146 are packed within the filter plug material as thin layer sections of general absorbent 344 and selective absorbent 346. In this embodiment, the layer packed absorbents are exposed to less plasticizer than the tow-dispersed absorbents and retain more surface area for interacting with smoke constituents. Moreover, as shown in FIG. 7, a multi-section filter 630 for a cigarette 610 includes the general adsorbent 344 and the selective adsorbent 346 dispersed in separate sections within a single length of fibrous filter material 342.
  • An advantage of the [0029] embodiment 110 of FIG. 2 is that the smoke passes over the selective adsorbent material 146 before passing over the general adsorbent 144. This allows the selective adsorbent 146 to remove some specific smoke constituents before the general adsorbent 144 is exposed to the smoke, thereby allowing the general adsorbent 144 to be more effective in removing the remaining smoke constituents. Thus, there is a synergistic effect observed for the adsorbents in the cellulose acetate/general adsorbent/specific adsorbent orientation as compared to the cellulose acetate/specific adsorbent/general adsorbent orientation.
  • As shown in FIGS. 5 and 6, in a [0030] multiple section filter 430 and 530 of cigarettes 410 and 510, respectively, the filter plug 132 is disposed between the general adsorbent section 134 and the selective adsorbent section 136 in FIG. 5 and is adjacent one end of the tobacco rod 20 in FIG. 6. In FIG. 5 the selective adsorbent section 136 is at the mouth end of the filter 430 and in FIG. 6 the general adsorbent section 134 is at the mouth end of the filter 530. Moreover, as shown in FIG. 8, a multiple section filter 730 of a cigarette 710 includes only a general absorbent section 134 and a selective absorbent section 136.
  • The following examples are representative of the embodiments which can be prepared in accordance with the present invention and the smoke constituent removal performance of those embodiments. The embodiments presented are intended for example purposes only and are not intended to be limiting in scope. [0031]
  • EXAMPLE 1
  • A [0032] cigarette 110 with a multiple section filter 130 is prepared as shown in FIG. 2 wherein a filter plug 132 is made of cellulose acetate tow and is about 7 mm in length, a general adsorbent section 134 consists of about 40 mg of activated coconut charcoal 144 dispersed throughout plasticizer-treated cellulose acetate tow 142 cut to deliver a section 134 about 10 mm in length, and a selective adsorbent section 136 consists of about 40 mg of Duolite A7 dispersed throughout plasticizer-treated cellulose acetate tow 142 cut to deliver a section 136 about 10 mm in length. The filter is attached to a tobacco rod having a length of about 56.5 mm and containing about 617 mg of a typical non-menthol cigarette blend wrapped in a 50 Coresta cigarette paper with about 1.8% citrate. The cigarette delivers about 10.3 mg tar per cigarette.
  • EXAMPLE 2
  • A [0033] cigarette 210 with a multiple section filter 230 is prepared with the section orientations as shown in FIG. 3 wherein the filter plug 132, the general adsorbent section 134, and the selective adsorbent section 136 are essentially identical to the filter plug 132, the general adsorbent section 134, and the selective adsorbent section 136 of Example 1. The filter is attached to a tobacco rod having a length of about 56.5 mm and containing about 617 mg of a typical non-menthol cigarette blend wrapped in a 50 Coresta cigarette paper with about 1.8% citrate. The cigarette delivers about 10.0 mg tar per cigarette.
  • EXAMPLE 3
  • Cigarettes are prepared as in Example 1 except that about 20 mg Duolite A7 is used in the [0034] selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.2 mg tar per cigarette.
  • EXAMPLE 4
  • Cigarettes are prepared as in Example 2 except that about 20 mg Duolite A7 is used in the [0035] selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.9 mg tar per cigarette.
  • EXAMPLE 5
  • Cigarettes are prepared as in Example 1 except that about 60 mg Duolite A7 is used in the [0036] selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.0 mg tar per cigarette.
  • EXAMPLE 6
  • Cigarettes are prepared as in Example 2 except that about 60 mg Duolite A7 is used in the [0037] selective adsorbent section 136 instead of 40 mg. The cigarette delivers about 10.3 mg tar per cigarette.
  • EXAMPLE 7
  • Cigarettes are prepared as in Example 1 except that about 69 mg of a mineral-based charcoal made from semi-anthracite coal is used in the [0038] general adsorbent section 136 instead of 40 mg of activated coconut charcoal. The cigarette delivers about 10.1 mg tar per cigarette.
  • EXAMPLE 8
  • Cigarettes are prepared as in Example 2 except that about 69 mg of a mineral-based charcoal made from semi-anthracite coal is used in the [0039] general adsorbent section 136 instead of 40 mg of activated coconut charcoal. The cigarette delivers about 10.2 mg tar per cigarette.
  • EXAMPLE 9
  • Representative cigarettes of Examples 1-6 are smoked to a butt length of about 4 mm from the tipping using a Borgwalt RM-20 smoking machine. Following the procedures set forth by the FTC, smoke constituents exiting the filter end of each cigarette are passed through a Cambridge filter pad, the vapor phase is collected in a bag and analyzed by GC/MS. The data is normalized to about 10 mg tar per cigarette. [0040]
    Average Vapor Phase Yields (μg/cig)
    Cigarettes
    Prepared by
    Example: 1 2 3 4 5 6
    mg Duolite/
    cigarette 40 20 60
    Filter Segment CA/GA/ CA/SA/ CA/GA/ CA/SA/ CA/GA/ CA/SA/
    Order SA GA SA GA SA GA
    Acetaldehyde 330.9 333.7 380.7 346.2 320.3 310.9
    Isoprene 231.4 240.4 252.1 246.1 227.4 227.2
    Acetone 144.1 163.5 156.0 160.5 148.0 151.4
    Methanol 104.9 127.6 114.5 142.8 111.7 98.5
    Acetonitrile 59.8 72.0 67.0 77.4 62.8 57.3
    Acrolein 29.6 31.4 33.6 32.2 28.5 29.9
    Methyl ethyl 29.3 35.9 30.9 38.5 30.1 31.6
    ketone
    Formaldehyde 23.5 25.8 25.5 25.0 22.1 24.5
    Propionalde- 25.7 27.4 29.3 28.5 25.3 25.0
    hyde
    1,3-Butadiene 25.5 25.9 27.5 25.5 25.8 25.0
    Toluene 22.5 25.3 22.0 27.5 23.9 22.5
    Benzene 20.6 23.6 21.6 24.1 21.1 21.4
    Acrylonitrile 16.8 17.7 18.0 18.0 17.0 16.5
    Furan 16.2 17.0 17.3 16.4 16.4 16.2
    Hydrogen 15.1 16.4 20.7 19.6 13.6 14.8
    cyanide
    Hydrogen 12.9 13.0 14.0 12.9 13.1 12.7
    sulfide
    Propionitrile 12.9 15.0 13.5 15.9 13.6 12.8
    2- 6.4 6.7 7.0 7.0 6.6 6.4
    Methylpropanal
    Crotonaldehyde 5.1 5.9 5.5 6.3 5.3 5.0
    Carbon 2.5 2.6 2.7 2.6 2.6 2.5
    disulfide
    Styrene 2.0 1.8 2.2 1.9 2.1 1.7
    Pyridine 1.9 1.9 1.9 1.8 1.9 1.8
  • EXAMPLE 10
  • Representative cigarettes of Examples 7 and 8 are smoked to a butt length of about 4 mm from the tipping using a Borgwalt RM-20 smoking machine. Following the procedures set forth by the FTC, smoke constituents exiting the filter end of each cigarette are passed through a Cambridge filter pad, the vapor phase is collected in a bag and analyzed by GC/MS. The data is normalized to about 10 mg tar per cigarette. [0041]
    Average Vapor Phase Yields (μg/cig)
    Cigarettes Prepared
    by Example: 7 8
    mg Duolite/cigarette 40
    Filter Segment Order CA/GA/SA CA/SA/GA
    Acetaldehyde 343.4 364.2
    Isoprene 225.0 268.9
    Acetone 138.6 162.3
    Methanol 95.1 134.7
    Acetonitrile 61.4 84.6
    Acrolein 9.8 35.3
    Methyl ethyl ketone 28.3 39.8
    Propionaldehyde 26.4 30.2
    1,3-Butadiene 25.4 27.7
    Toluene 18.7 24.2
    Benzene 21.3 27.3
    Acrylonitrile 7.5 9.0
    Furan 17.0 18.4
    Hydrogen cyanide 16.7 19.5
    Hydrogen sulfide 14.7 14.1
    Propionitrile 15.7 20.3
    2-Methylpropanal 13.0 14.8
    Crotonaldehyde 3.3 5.1
    Carbon disulfide 2.8 2.8
    Styrene 1.8 2.1
    Pyridine 1.3 1.4
  • From a production perspective, there are some advantages to dispersing the [0042] selective adsorbent material 146 and the general adsorbent material 144 throughout the filter tow 142. Specifically, when the adsorbents 144, 146 are dispersed within the tow 142, the adsorbents are easier to handle than they are as loose particles. However, when the adsorbents 144, 146 are dispersed within the tow 142, there is a risk that any plasticizer which is used on the tow 142 will affect the surface of the adsorbents 144, 146, thereby reducing the adsorption capacity. Thus, as shown in FIG. 4, the adsorbents 144, 146 may be packed within the filter plug material 142 as thin layer sections of general adsorbent 344 and selective adsorbent 346. Because the layer packed adsorbents would not be exposed to the same level of plasticizer as the tow-dispersed adsorbents, the adsorbents would retain more available surface area for interacting with smoke constituents.
  • From a reading of the above, one with ordinary skill in the art should be able to devise variations to the inventive features. For example, the filter plug, the general adsorbent section, and the selective adsorbent section may vary in length and diameter, relative to any dimensions specified herein and relative to each other. Further, the various section dimensions may be optimized for a particular tobacco blend or for particular tobacco rod dimensions. These and other variations are believed to fall within the spirit and scope of the attached claims. [0043]

Claims (31)

1. A multiple section cigarette filter comprising:
(a) a selective adsorbent section comprising a selective adsorbent material having an affinity for a predetermined class of chemical compounds 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 axially aligned in tandem.
2. The cigarette filter of claim 1 wherein said selective adsorbent material is an ion-exchange resin.
3. The cigarette filter of claim 2 wherein said selective adsorbent material has a surface area sufficient to ensure that the surface functional sites are easily accessible to a smoke constituent.
4. The cigarette filter of claim 2 wherein said ion-exchange resin has a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups.
5. The cigarette filter of claim 2 wherein said selective adsorbent section comprises said selective adsorbent material dispersed throughout a fibrous material.
6. The cigarette filter of claim 2 wherein said selective adsorbent section comprises a close-packed bed of said selective adsorbent material.
7. 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.
8. The cigarette filter of claim 7 wherein said general adsorbent section comprises said general adsorbent material dispersed throughout a fibrous material.
9. The cigarette filter of claim 7 wherein said general adsorbent section comprises a close-packed bed of said general adsorbent material.
10. The cigarette filter of claim 7 wherein said general adsorbent section further includes a metal oxide or other metal-based complex.
11. 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.
12. The cigarette filter of claim 11 wherein said filter plug further includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
13. The cigarette filter of claim 11 wherein said general adsorbent section is positioned between said fibrous filter plug and said selective adsorbent section.
14. The cigarette filter of claim 11 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
15. The cigarette filter of claim 11, said fibrous filter plug being positioned between said selective adsorbent section and said general adsorbent section.
16. The cigarette filter of claim 1, including a plug wrap circumscribing said general adsorbent section and said selective adsorbent section.
17. The cigarette filter of claim 1, said selective absorbent material having a surface area greater than about 35 m2/g.
18. 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 axially aligned in tandem.
19. The cigarette filter of claim 18 wherein said ion-exchange resin has a phenol-formaldehyde resin matrix and is surface-functionalized with primary and secondary amine groups.
20. The cigarette filter of claim 18 wherein said selective adsorbent section comprises said ion-exchange resin dispersed throughout a fibrous material.
21. The cigarette filter of claim 18 wherein said selective adsorbent section comprises a close-packed bed of said ion-exchange resin.
22. The cigarette filter of claim 18 wherein said general adsorbent section comprises said general adsorbent material dispersed throughout a fibrous material.
23. The cigarette filter of claim 22 wherein said general adsorbent section further includes an additive selected from a metal oxide or other metal-based complex.
24. The cigarette filter of claim 18 wherein said general adsorbent section comprises a close-packed bed of said general adsorbent material.
25. The cigarette filter of claim 24 wherein said general adsorbent section further includes an additive selected from a metal oxide or a metal-based complex.
26. The cigarette filter of claim 18 wherein said filter plug is made from cellulose acetate tow.
27. The cigarette filter of claim 18 wherein said filter plug further includes a plasticizer, a liquid additive, a flavoring agent or a combination thereof.
28. The cigarette filter of claim 18 wherein said general adsorbent section is positioned between said fibrous filter plug and said selective adsorbent section.
29. The cigarette filter of claim 18 wherein said selective adsorbent section is positioned between said fibrous filter plug and said general adsorbent section.
30. The cigarette filter of claim 18, said fibrous filter plug being positioned between said selection absorbent section and said general absorbent section.
31. The cigarette filter of claim 18, said selective absorbent material having a surface area greater than 35 m2/g.
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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050066980A1 (en) * 2003-09-30 2005-03-31 Crooks Evon Llewellyn Filtered cigarette incorporating an adsorbent material
US20050066984A1 (en) * 2003-09-30 2005-03-31 Crooks Evon Llewellyn Filtered cigarette incorporating an adsorbent material
US20080173320A1 (en) * 2007-01-19 2008-07-24 R. J. Reynolds Tobacco Company Filtered Smoking Articles
US20080245377A1 (en) * 2007-04-04 2008-10-09 R.J. Reynolds Tobacco Company Cigarette comprising dark-cured tobacco
US20090288669A1 (en) * 2008-05-21 2009-11-26 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US20090288672A1 (en) * 2008-05-21 2009-11-26 R. J. Reynolds Tobacco Company Cigarette Filter Comprising a Carbonaceous Fiber
US20100122708A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Adsorbent Material Impregnated with Metal Oxide Component
US20100125039A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Carbonaceous Material Having Modified Pore Structure
US20100206317A1 (en) * 2007-09-28 2010-08-19 Vector Tobacco, Inc. Reduced risk tobacco products and use thereof
US20100206319A1 (en) * 2009-02-16 2010-08-19 Gregg Gorski Personal smoke filter or smoke trap
WO2010101918A1 (en) * 2009-03-02 2010-09-10 Tersus, Llc Filtration agents and methods of use thereof
US20100242977A1 (en) * 2007-12-14 2010-09-30 Masafumi Tarora Cigarette filter and filter-tipped cigarette
EP2241203A2 (en) 2006-03-16 2010-10-20 R. J. Reynolds Tobacco Company Smoking Article
WO2011019646A1 (en) 2009-08-11 2011-02-17 R.J. Reynolds Tobacco Company Degradable filter element
WO2011140430A1 (en) 2010-05-07 2011-11-10 R. J. Reynolds Tobacco Company Filtered cigarette with modifiable sensory characteristics
US8066011B2 (en) 2003-09-30 2011-11-29 R. J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US8079369B2 (en) 2008-05-21 2011-12-20 R.J. Reynolds Tobacco Company Method of forming a cigarette filter rod member
WO2012003092A1 (en) 2010-06-30 2012-01-05 R.J. Reynolds Tobacco Company Degradable filter element for smoking article
WO2012016051A2 (en) 2010-07-30 2012-02-02 R. J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
EP2486812A1 (en) 2006-03-16 2012-08-15 R.J. Reynolds Tobacco Company Smoking article
EP2537427A1 (en) 2008-05-21 2012-12-26 R.J. Reynolds Tobacco Company Cigarette filter having composite fiber structures
WO2013019616A2 (en) 2011-07-29 2013-02-07 R. J. Reynolds Tobacco Company Plasticizer composition for degradable polyester filter tow
WO2013101458A1 (en) 2011-12-28 2013-07-04 R.J. Reynolds Tobacco Company Method of tipping for smoking article
WO2013101457A1 (en) 2011-12-28 2013-07-04 R.J. Reynolds Tobacco Company Method of filter assembly for smoking article
US8739802B2 (en) 2006-10-02 2014-06-03 R.J. Reynolds Tobacco Company Filtered cigarette
US8882647B2 (en) 2005-09-23 2014-11-11 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US20150114412A1 (en) * 2012-04-25 2015-04-30 British American Tobacco (Investments) Limited Smoking articles
US20150374029A1 (en) * 2007-06-11 2015-12-31 R.J. Reynolds Tobacco Company Apparatus for inserting objects into a filter component of a smoking article and associated method
WO2016040768A1 (en) 2014-09-12 2016-03-17 R. J. Reynolds Tobacco Company Tobacco-derived filter element
WO2017132709A1 (en) * 2016-02-05 2017-08-10 "SPS CIGARONNE" Co. Ltd. Filter cigarette
US10028528B2 (en) 2015-06-01 2018-07-24 Antonino M. Pero Exhalation smoke filter mask
US10188140B2 (en) 2005-08-01 2019-01-29 R.J. Reynolds Tobacco Company Smoking article
US10226066B2 (en) 2016-03-07 2019-03-12 R.J. Reynolds Tobacco Company Rosemary in a tobacco blend
WO2019077530A1 (en) 2017-10-19 2019-04-25 Rai Strategic Holdings, Inc. Colorimetric aerosol and gas detection for aerosol delivery device

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002228901A1 (en) * 2000-11-10 2002-05-21 Vector Tobacco (Bermuda) Ltd. Method and product for removing carcinogens from tobacco smoke
GB0209690D0 (en) * 2002-04-27 2002-06-05 British American Tobacco Co Improvements relating to smoking articles and smokable filler materials therefor
US6863074B2 (en) * 2002-08-30 2005-03-08 Philip Morris Usa Inc. Cigarette filters comprising unfunctionalized porous polyaromatic resins for removing gas phase constituents from mainstream tobacco smoke
US20040231684A1 (en) * 2003-05-20 2004-11-25 Zawadzki Michael A. Smoking article and smoking article filter
DE602004012296T3 (en) * 2003-09-30 2013-07-04 R.J. Reynolds Tobacco Company FILTER CIGARETTE CONTAINING ADSORBING MATERIAL
KR100617983B1 (en) * 2005-01-07 2006-08-31 주식회사 케이티앤지 Cigarette Filter
DE102005005175A1 (en) 2005-02-01 2006-08-10 Reemtsma Cigarettenfabriken Gmbh Filter cigarette
CN101232940B (en) 2005-08-10 2012-01-04 三菱化学株式会社 Gas adsorbent
WO2007104908A1 (en) 2006-03-10 2007-09-20 British American Tobacco (Investments) Limited Smoking article filter
PT1889550E (en) * 2006-08-04 2009-10-26 Philip Morris Prod Multi-component filter providing multiple flavour enhancement
TWI421037B (en) * 2006-12-07 2014-01-01 British American Tobacco Co Molecularly imprinted polymers selective for tobacco specific nitrosamines and methods of using the same
US8235056B2 (en) * 2006-12-29 2012-08-07 Philip Morris Usa Inc. Smoking article with concentric hollow core in tobacco rod and capsule containing flavorant and aerosol forming agents in the filter system
EP2211645A4 (en) * 2007-09-28 2013-01-16 Vector Tobacco Inc Reduced risk tobacco products and use thereof
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EP2901871A1 (en) * 2014-01-31 2015-08-05 Philip Morris Products S.A. Multi-segment filter tube
GB201405657D0 (en) 2014-03-28 2014-05-14 British American Tobacco Co Additive carrying composition
GB201412752D0 (en) 2014-07-17 2014-09-03 Nicoventures Holdings Ltd Electronic vapour provision system
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US10383369B2 (en) * 2017-06-07 2019-08-20 Rai Strategic Holdings, Inc. Fibrous filtration material for electronic smoking article
ES2717550B2 (en) * 2017-12-21 2020-02-28 Univ Alicante COMBINED FILTER FOR THE ELIMINATION OF TARS AND TOXIC COMPOUNDS OF TOBACCO SMOKE
CN110250567A (en) * 2019-05-08 2019-09-20 中山市博海精细化工有限公司 A kind of environment-friendly cigarette filter tip filler and preparation method
US11291242B2 (en) 2019-08-28 2022-04-05 Aiger Group Ag Apparatus and method for forming a smoke filter
KR102373179B1 (en) * 2020-03-05 2022-03-11 조영상 Cigarette filter for toxic gas decomposition
CN113287784B (en) * 2021-06-25 2022-09-30 云南中烟工业有限责任公司 Cigarette filter particles capable of reducing release amount of hydrogen sulfide in smoke, preparation method and filter

Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815760A (en) * 1951-12-24 1957-12-10 Schreus Hans Theo Tobacco smoke filter
US2915069A (en) * 1954-07-13 1959-12-01 Olin Mathieson Smoking device
US3266973A (en) * 1963-07-25 1966-08-16 Richard P Crowley Method of preparing adsorbent filter paper containing crystalline zeolite particles, and paper thereof
US3280823A (en) * 1963-10-01 1966-10-25 Philip Morris Inc Additive-releasing filter for releasing additives into tobacco smoke
US3658069A (en) * 1970-02-17 1972-04-25 Stanford Research Inst Filter for reducing the level of carbon monoxide in tobacco smoke
US3716500A (en) * 1970-09-25 1973-02-13 Brown & Williamson Tobacco Tobacco smoke filter material
US3828800A (en) * 1970-09-25 1974-08-13 Brown & Williamson Tobacco Tobacco smoke filter material
US3841338A (en) * 1970-07-23 1974-10-15 British American Tobacco Co Tobacco-smoke filters
US3960770A (en) * 1973-08-03 1976-06-01 The Dow Chemical Company Process for preparing macroporous open-cell carbon foam from normally crystalline vinylidene chloride polymer
US3998988A (en) * 1970-12-24 1976-12-21 Teijin Limited Conjugate fiber, fibrous material and fibrous article made therefrom and process for production thereof
US4003257A (en) * 1974-03-12 1977-01-18 Nasa Analysis of volatile organic compounds
US4033361A (en) * 1974-06-17 1977-07-05 Brown & Williamson Tobacco Corporation Tobacco-smoke filters
US4063912A (en) * 1975-02-18 1977-12-20 Rohm And Haas Company Gaseous phase adsorption using partially pyrolyzed polymer particles
US4149550A (en) * 1976-08-02 1979-04-17 Wiggins Teape Limited Moulded fibrous material
US4195649A (en) * 1977-01-13 1980-04-01 Toho Beslon Co., Ltd. Tobacco smoke filter
US4246910A (en) * 1977-08-01 1981-01-27 Philip Morris Incorporated Cigarette filter material comprising compounds of iron in high oxidation states
US4266561A (en) * 1978-04-10 1981-05-12 Brown & Williamson Tobacco Corporation Tobacco smoke filtering compositions
US4300577A (en) * 1978-05-16 1981-11-17 British-American Tobacco Company Limited Tobacco-smoke filters
US4438196A (en) * 1982-09-28 1984-03-20 Miles Laboratories, Inc. Immobilization of biocatalysts on granular carbon
US4466906A (en) * 1982-04-09 1984-08-21 Compagnie Francaise De Raffinage Catalyst for the oxidation of mercaptans to disulfides, process for the preparation thereof, and its use in the sweetening of petroleum distillates
US4531953A (en) * 1983-06-21 1985-07-30 Calgon Corporation Sublimation of amine compounds on activated carbon pore surfaces
US4700723A (en) * 1983-03-10 1987-10-20 Toray Industries, Inc. Tobacco filter and fibrous ion exchange resin
US5060672A (en) * 1989-04-28 1991-10-29 Pesci Dohanygyar Highly efficient tobacco smoke filter
US5104530A (en) * 1988-01-29 1992-04-14 Maroldo Stephen G Chromatography column with carbonaceous adsorbents from pyrolyzed polysulfonated polymers
US5228962A (en) * 1991-02-01 1993-07-20 Allied-Signal Inc. Separation/recovery of ammonium salts via electrodialytic water splitting
US5271780A (en) * 1991-12-30 1993-12-21 Kem-Wove, Incorporated Adsorbent textile product and process
US5271419A (en) * 1989-09-29 1993-12-21 R. J. Reynolds Tobacco Company Cigarette
US5281257A (en) * 1992-12-11 1994-01-25 Purus Inc. System for increasing efficiency of vapor phase pollutant removal with on-site regeneration and pollutant recovery
US5319114A (en) * 1993-09-23 1994-06-07 Arco Chemical Technology, L. P. Olefin epoxidation using a carbon molecular sieve impregnated with a transition metal
US5385876A (en) * 1993-01-27 1995-01-31 Syracuse University Activated carbons molecularly engineered
US5409021A (en) * 1992-04-22 1995-04-25 Safaev; Radzhab D. Cigarette filter
US5423336A (en) * 1992-02-25 1995-06-13 H.F. & Ph.F. Reemtsma Gmbh & Co. Ventilated filter cigarette
US5575302A (en) * 1993-12-22 1996-11-19 Hoechst Aktiengesellschaft Filter for removing nitrogen oxides from tobacco smoke
US6117328A (en) * 1995-07-14 2000-09-12 U.S. Environmental Protection Agency Adsorbent-filled membranes for pervaporation
US6119699A (en) * 1997-12-19 2000-09-19 Sung; Michael T. Method and apparatus for the selective removal of specific components from smoke condensates
US6257242B1 (en) * 1999-10-18 2001-07-10 Ioannis C. Stavridis Filter element
US6584979B2 (en) * 2000-04-20 2003-07-01 Philip Morris Incorporated High efficiency cigarette filters having shaped microcavity fibers impregnated with adsorbent or absorbent materials
US6779529B2 (en) * 2001-08-01 2004-08-24 Brown & Williamson Tobacco Corporation Cigarette filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185760A (en) * 1933-03-10 1940-01-02 Altenkirch Edmund Drying method and apparatus
CH399981A (en) * 1960-06-30 1965-09-30 Jacob Van Buuren Arend Tobacco smoke filters
BE647803A (en) * 1964-05-12 1964-11-12
US5718943A (en) * 1995-07-20 1998-02-17 Rohm And Haas Company Method for producing efflorescence resistant coating on cementitious substrate

Patent Citations (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815760A (en) * 1951-12-24 1957-12-10 Schreus Hans Theo Tobacco smoke filter
US2915069A (en) * 1954-07-13 1959-12-01 Olin Mathieson Smoking device
US3266973A (en) * 1963-07-25 1966-08-16 Richard P Crowley Method of preparing adsorbent filter paper containing crystalline zeolite particles, and paper thereof
US3280823A (en) * 1963-10-01 1966-10-25 Philip Morris Inc Additive-releasing filter for releasing additives into tobacco smoke
US3658069A (en) * 1970-02-17 1972-04-25 Stanford Research Inst Filter for reducing the level of carbon monoxide in tobacco smoke
US3841338A (en) * 1970-07-23 1974-10-15 British American Tobacco Co Tobacco-smoke filters
US3716500A (en) * 1970-09-25 1973-02-13 Brown & Williamson Tobacco Tobacco smoke filter material
US3828800A (en) * 1970-09-25 1974-08-13 Brown & Williamson Tobacco Tobacco smoke filter material
US3998988A (en) * 1970-12-24 1976-12-21 Teijin Limited Conjugate fiber, fibrous material and fibrous article made therefrom and process for production thereof
US3960770A (en) * 1973-08-03 1976-06-01 The Dow Chemical Company Process for preparing macroporous open-cell carbon foam from normally crystalline vinylidene chloride polymer
US4003257A (en) * 1974-03-12 1977-01-18 Nasa Analysis of volatile organic compounds
US4033361A (en) * 1974-06-17 1977-07-05 Brown & Williamson Tobacco Corporation Tobacco-smoke filters
US4063912A (en) * 1975-02-18 1977-12-20 Rohm And Haas Company Gaseous phase adsorption using partially pyrolyzed polymer particles
US4149550A (en) * 1976-08-02 1979-04-17 Wiggins Teape Limited Moulded fibrous material
US4195649A (en) * 1977-01-13 1980-04-01 Toho Beslon Co., Ltd. Tobacco smoke filter
US4246910A (en) * 1977-08-01 1981-01-27 Philip Morris Incorporated Cigarette filter material comprising compounds of iron in high oxidation states
US4266561A (en) * 1978-04-10 1981-05-12 Brown & Williamson Tobacco Corporation Tobacco smoke filtering compositions
US4300577A (en) * 1978-05-16 1981-11-17 British-American Tobacco Company Limited Tobacco-smoke filters
US4466906A (en) * 1982-04-09 1984-08-21 Compagnie Francaise De Raffinage Catalyst for the oxidation of mercaptans to disulfides, process for the preparation thereof, and its use in the sweetening of petroleum distillates
US4438196A (en) * 1982-09-28 1984-03-20 Miles Laboratories, Inc. Immobilization of biocatalysts on granular carbon
US4700723A (en) * 1983-03-10 1987-10-20 Toray Industries, Inc. Tobacco filter and fibrous ion exchange resin
US4531953A (en) * 1983-06-21 1985-07-30 Calgon Corporation Sublimation of amine compounds on activated carbon pore surfaces
US5104530A (en) * 1988-01-29 1992-04-14 Maroldo Stephen G Chromatography column with carbonaceous adsorbents from pyrolyzed polysulfonated polymers
US5060672A (en) * 1989-04-28 1991-10-29 Pesci Dohanygyar Highly efficient tobacco smoke filter
US5271419A (en) * 1989-09-29 1993-12-21 R. J. Reynolds Tobacco Company Cigarette
US5228962A (en) * 1991-02-01 1993-07-20 Allied-Signal Inc. Separation/recovery of ammonium salts via electrodialytic water splitting
US5271780A (en) * 1991-12-30 1993-12-21 Kem-Wove, Incorporated Adsorbent textile product and process
US5423336A (en) * 1992-02-25 1995-06-13 H.F. & Ph.F. Reemtsma Gmbh & Co. Ventilated filter cigarette
US5409021A (en) * 1992-04-22 1995-04-25 Safaev; Radzhab D. Cigarette filter
US5281257A (en) * 1992-12-11 1994-01-25 Purus Inc. System for increasing efficiency of vapor phase pollutant removal with on-site regeneration and pollutant recovery
US5385876A (en) * 1993-01-27 1995-01-31 Syracuse University Activated carbons molecularly engineered
US5319114A (en) * 1993-09-23 1994-06-07 Arco Chemical Technology, L. P. Olefin epoxidation using a carbon molecular sieve impregnated with a transition metal
US5575302A (en) * 1993-12-22 1996-11-19 Hoechst Aktiengesellschaft Filter for removing nitrogen oxides from tobacco smoke
US6117328A (en) * 1995-07-14 2000-09-12 U.S. Environmental Protection Agency Adsorbent-filled membranes for pervaporation
US6119699A (en) * 1997-12-19 2000-09-19 Sung; Michael T. Method and apparatus for the selective removal of specific components from smoke condensates
US6257242B1 (en) * 1999-10-18 2001-07-10 Ioannis C. Stavridis Filter element
US6584979B2 (en) * 2000-04-20 2003-07-01 Philip Morris Incorporated High efficiency cigarette filters having shaped microcavity fibers impregnated with adsorbent or absorbent materials
US6779529B2 (en) * 2001-08-01 2004-08-24 Brown & Williamson Tobacco Corporation Cigarette filter

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9554594B2 (en) 2003-09-30 2017-01-31 R.J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US20050066984A1 (en) * 2003-09-30 2005-03-31 Crooks Evon Llewellyn Filtered cigarette incorporating an adsorbent material
US20050066980A1 (en) * 2003-09-30 2005-03-31 Crooks Evon Llewellyn Filtered cigarette incorporating an adsorbent material
US7669604B2 (en) 2003-09-30 2010-03-02 R.J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US8066011B2 (en) 2003-09-30 2011-11-29 R. J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US7856990B2 (en) * 2003-09-30 2010-12-28 R. J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US8678013B2 (en) 2005-08-01 2014-03-25 R.J. Reynolds Tobacco Company Smoking article
US10188140B2 (en) 2005-08-01 2019-01-29 R.J. Reynolds Tobacco Company Smoking article
US10123562B2 (en) 2005-09-23 2018-11-13 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US9028385B2 (en) 2005-09-23 2015-05-12 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US9398777B2 (en) 2005-09-23 2016-07-26 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US8882647B2 (en) 2005-09-23 2014-11-11 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US11383477B2 (en) 2005-09-23 2022-07-12 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
EP2241203A2 (en) 2006-03-16 2010-10-20 R. J. Reynolds Tobacco Company Smoking Article
EP3569079A1 (en) 2006-03-16 2019-11-20 R. J. Reynolds Tobacco Company Smoking article
US12048325B2 (en) 2006-03-16 2024-07-30 R.J. Reynolds Tobacco Company Smoking article
US10258079B2 (en) 2006-03-16 2019-04-16 R.J. Reynolds Tobacco Company Smoking article
EP2486812A1 (en) 2006-03-16 2012-08-15 R.J. Reynolds Tobacco Company Smoking article
EP2762020A2 (en) 2006-03-16 2014-08-06 R. J. Reynolds Tobacco Company Smoking article
US8739802B2 (en) 2006-10-02 2014-06-03 R.J. Reynolds Tobacco Company Filtered cigarette
US20080173320A1 (en) * 2007-01-19 2008-07-24 R. J. Reynolds Tobacco Company Filtered Smoking Articles
US20080245377A1 (en) * 2007-04-04 2008-10-09 R.J. Reynolds Tobacco Company Cigarette comprising dark-cured tobacco
US8186360B2 (en) 2007-04-04 2012-05-29 R.J. Reynolds Tobacco Company Cigarette comprising dark air-cured tobacco
US10383359B2 (en) * 2007-06-11 2019-08-20 R.J. Reynolds Tobacco Company Apparatus for inserting objects into a filter component of a smoking article and associated method
US20150374029A1 (en) * 2007-06-11 2015-12-31 R.J. Reynolds Tobacco Company Apparatus for inserting objects into a filter component of a smoking article and associated method
US11944119B2 (en) 2007-06-11 2024-04-02 R.J. Reynolds Tobacco Company Apparatus for inserting objects into a filter component of a smoking article and associated method
US20100206317A1 (en) * 2007-09-28 2010-08-19 Vector Tobacco, Inc. Reduced risk tobacco products and use thereof
US20100242977A1 (en) * 2007-12-14 2010-09-30 Masafumi Tarora Cigarette filter and filter-tipped cigarette
US8496011B2 (en) 2008-05-21 2013-07-30 R.J. Reynolds Tobacco Company Apparatus for forming a filter component of a smoking article
US8375958B2 (en) 2008-05-21 2013-02-19 R.J. Reynolds Tobacco Company Cigarette filter comprising a carbonaceous fiber
EP2537427A1 (en) 2008-05-21 2012-12-26 R.J. Reynolds Tobacco Company Cigarette filter having composite fiber structures
US8613284B2 (en) 2008-05-21 2013-12-24 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US8079369B2 (en) 2008-05-21 2011-12-20 R.J. Reynolds Tobacco Company Method of forming a cigarette filter rod member
US20090288672A1 (en) * 2008-05-21 2009-11-26 R. J. Reynolds Tobacco Company Cigarette Filter Comprising a Carbonaceous Fiber
US20090288669A1 (en) * 2008-05-21 2009-11-26 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US8511319B2 (en) 2008-11-20 2013-08-20 R. J. Reynolds Tobacco Company Adsorbent material impregnated with metal oxide component
US8119555B2 (en) 2008-11-20 2012-02-21 R. J. Reynolds Tobacco Company Carbonaceous material having modified pore structure
US20100125039A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Carbonaceous Material Having Modified Pore Structure
US20100122708A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Adsorbent Material Impregnated with Metal Oxide Component
US20100206319A1 (en) * 2009-02-16 2010-08-19 Gregg Gorski Personal smoke filter or smoke trap
WO2010098933A1 (en) 2009-02-25 2010-09-02 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US9265286B2 (en) 2009-03-02 2016-02-23 Tersus, Llc Filtration agents and methods of use thereof
WO2010101918A1 (en) * 2009-03-02 2010-09-10 Tersus, Llc Filtration agents and methods of use thereof
WO2011019646A1 (en) 2009-08-11 2011-02-17 R.J. Reynolds Tobacco Company Degradable filter element
WO2011140430A1 (en) 2010-05-07 2011-11-10 R. J. Reynolds Tobacco Company Filtered cigarette with modifiable sensory characteristics
WO2012003092A1 (en) 2010-06-30 2012-01-05 R.J. Reynolds Tobacco Company Degradable filter element for smoking article
WO2012016051A2 (en) 2010-07-30 2012-02-02 R. J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
US8720450B2 (en) 2010-07-30 2014-05-13 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
US9119420B2 (en) 2010-07-30 2015-09-01 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
WO2013019616A2 (en) 2011-07-29 2013-02-07 R. J. Reynolds Tobacco Company Plasticizer composition for degradable polyester filter tow
WO2013101458A1 (en) 2011-12-28 2013-07-04 R.J. Reynolds Tobacco Company Method of tipping for smoking article
WO2013101457A1 (en) 2011-12-28 2013-07-04 R.J. Reynolds Tobacco Company Method of filter assembly for smoking article
US20150114412A1 (en) * 2012-04-25 2015-04-30 British American Tobacco (Investments) Limited Smoking articles
WO2016040768A1 (en) 2014-09-12 2016-03-17 R. J. Reynolds Tobacco Company Tobacco-derived filter element
US10028528B2 (en) 2015-06-01 2018-07-24 Antonino M. Pero Exhalation smoke filter mask
WO2017132709A1 (en) * 2016-02-05 2017-08-10 "SPS CIGARONNE" Co. Ltd. Filter cigarette
US10226066B2 (en) 2016-03-07 2019-03-12 R.J. Reynolds Tobacco Company Rosemary in a tobacco blend
US10512286B2 (en) 2017-10-19 2019-12-24 Rai Strategic Holdings, Inc. Colorimetric aerosol and gas detection for aerosol delivery device
WO2019077530A1 (en) 2017-10-19 2019-04-25 Rai Strategic Holdings, Inc. Colorimetric aerosol and gas detection for aerosol delivery device

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