CA2573030C - Cigarette filter and cigarette provided with the same - Google Patents
Cigarette filter and cigarette provided with the same Download PDFInfo
- Publication number
- CA2573030C CA2573030C CA002573030A CA2573030A CA2573030C CA 2573030 C CA2573030 C CA 2573030C CA 002573030 A CA002573030 A CA 002573030A CA 2573030 A CA2573030 A CA 2573030A CA 2573030 C CA2573030 C CA 2573030C
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- Prior art keywords
- ptio
- cigarette
- activated carbon
- filter
- impregnated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 50
- DYUUGILMVYJEHY-UHFFFAOYSA-N 1-$l^{1}-oxidanyl-4,4,5,5-tetramethyl-3-oxido-2-phenylimidazol-3-ium Chemical group CC1(C)C(C)(C)N([O])C(C=2C=CC=CC=2)=[N+]1[O-] DYUUGILMVYJEHY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 88
- 239000002245 particle Substances 0.000 claims description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 38
- 239000000779 smoke Substances 0.000 description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 16
- 241000208125 Nicotiana Species 0.000 description 7
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001007 puffing effect Effects 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XFZJEEAOWLFHDH-UHFFFAOYSA-N (2R,2'R,3R,3'R,4R)-3,3',4',5,7-Pentahydroxyflavan(48)-3,3',4',5,7-pentahydroxyflavan Natural products C=12OC(C=3C=C(O)C(O)=CC=3)C(O)CC2=C(O)C=C(O)C=1C(C1=C(O)C=C(O)C=C1O1)C(O)C1C1=CC=C(O)C(O)=C1 XFZJEEAOWLFHDH-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- CWEZAWNPTYBADX-UHFFFAOYSA-N Procyanidin Natural products OC1C(OC2C(O)C(Oc3c2c(O)cc(O)c3C4C(O)C(Oc5cc(O)cc(O)c45)c6ccc(O)c(O)c6)c7ccc(O)c(O)c7)c8c(O)cc(O)cc8OC1c9ccc(O)c(O)c9 CWEZAWNPTYBADX-UHFFFAOYSA-N 0.000 description 1
- MOJZMWJRUKIQGL-FWCKPOPSSA-N Procyanidin C2 Natural products O[C@@H]1[C@@H](c2cc(O)c(O)cc2)Oc2c([C@H]3[C@H](O)[C@@H](c4cc(O)c(O)cc4)Oc4c3c(O)cc(O)c4)c(O)cc(O)c2[C@@H]1c1c(O)cc(O)c2c1O[C@@H]([C@H](O)C2)c1cc(O)c(O)cc1 MOJZMWJRUKIQGL-FWCKPOPSSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- HGVVOUNEGQIPMS-UHFFFAOYSA-N procyanidin Chemical compound O1C2=CC(O)=CC(O)=C2C(O)C(O)C1(C=1C=C(O)C(O)=CC=1)OC1CC2=C(O)C=C(O)C=C2OC1C1=CC=C(O)C(O)=C1 HGVVOUNEGQIPMS-UHFFFAOYSA-N 0.000 description 1
- 229920002414 procyanidin Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/14—Use of materials for tobacco smoke filters of organic materials as additive
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
- A24D3/163—Carbon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
Disclosed is a filter for cigarettes containing a filter material for cigarettes which is impregnated with 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl.
Description
CIGARETTE FILTER AND CIGARETTE PROVIDED WITH THE SAME
Technical Field The present invention relates to a cigarette filter and a cigarette provided with the same, and more specifically, to a cigarette filter excellent in efficiency of removing nitrogen oxides (NOx) in the mainstream smoke and a cigarette provided with the same.
Background Art Nowadays, various requirements are imposed on cigarettes, one of which is to decrease the amount of NOx in the mainstream smoke of cigarettes (Jpn. Pat.
Appln. KOKAI Publication No. 2002-119270). Jpn. Pat.
Appln. KOKAI Publication No. 2002-119270 discloses a tobacco filter in which a procyanidin is incorporated in filaments that form the filter.
However, it has been found that the conventional tobacco filters are not capable of removing NOx from the mainstream smoke to a satisfactory degree.
Disclosure of Invention Thus, it is an object of the present invention to provide a cigarette filter that can efficiently remove nitrogen oxides from the tobacco mainstream smoke, and a cigarette provided with such filter.
Technical Field The present invention relates to a cigarette filter and a cigarette provided with the same, and more specifically, to a cigarette filter excellent in efficiency of removing nitrogen oxides (NOx) in the mainstream smoke and a cigarette provided with the same.
Background Art Nowadays, various requirements are imposed on cigarettes, one of which is to decrease the amount of NOx in the mainstream smoke of cigarettes (Jpn. Pat.
Appln. KOKAI Publication No. 2002-119270). Jpn. Pat.
Appln. KOKAI Publication No. 2002-119270 discloses a tobacco filter in which a procyanidin is incorporated in filaments that form the filter.
However, it has been found that the conventional tobacco filters are not capable of removing NOx from the mainstream smoke to a satisfactory degree.
Disclosure of Invention Thus, it is an object of the present invention to provide a cigarette filter that can efficiently remove nitrogen oxides from the tobacco mainstream smoke, and a cigarette provided with such filter.
According to the present invention, there is provided a cigarette filter comprising a cigarette filter material to which 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-l-oxyl is added.
Further, according to the present invention, there is provided a cigarette provided with a cigarette filter according to the present invention.
Brief Description of Drawings FIG. 1 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 1, which will be described later in detail, together with that of a comparative example;
FIG. 2 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 2, which will be described later in detail, together with that of a comparative example;
FIG. 3 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 3, which will be described later in detail, together with that of a comparative example; and FIG. 4 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 4, which will be described later in detail, together with that of a comparative example.
Best Mode for Carrying Out the Invention The present invention will be described in more detail below.
A cigarette filter according to the present invention comprises a cigarette filter material to which 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl (PTIO) is added.
In the cigarette filter of the present invention, PTIO, an effective ingredient for removing nitrogen oxides, is a compound known per se (see, for example, Jpn. Pat. Appln. KOKAI Publication No. 9-43153).
In the cigarette filter of the present invention, use may be made, as the filter material, of cellulose acetate fiber tow, filter paper and porous particulate carrier such as activated carbon. In the case where cellulose acetate fiber tow is used as the filter material, PTIO can be added by spraying PTIO onto the fiber tow. When filter paper is used, PTIO can be impregnated into the filter paper. The filter material thus obtained can be wrapped with a wrapper by an ordinary method, and connected to an end of a cigarette.
In the case where a porous particulate carrier such as activated carbon is used as the filter material, PTIO is impregnated in the porous particulate carrier, and then the thus obtained PTIO-carrying particles are filled in a cavity as is known in the art or added to a tow. More specifically as to the cavity filling, a plain filter is provided to either end of a filter wrapper paper pipe. The PTIO-carrying particles are filled in the cavity between these plain filters.
On the other hand, the addition to the tow is carried out by a method similar to that used for charcoal filters of commercially available cigarettes, that is, the PTIO-carrying particles are dispersed between the fibers of the acetate filter.
PTIO is added preferably in an amount of 3 to 10 parts by weight, particularly preferably, 5 to 7 parts by weight based on 100 parts by weight of the filter material. PTIO significantly reduces the amount of NO
and NOx contained in the cigarette mainstream smoke even under wet conditions, which are equivalent to the actual smoking conditions.
The present invention will be described by way of Examples, but the present invention should not be limited to the Examples.
Example 1 <Preparation of PTIO-impregnated activated carbon>
10 mg, 30 mg, 50 mg and 100 mg of PTIO (available from Wako Pure Chemical Industries, Ltd.; CAS:
18390-00-6) were completely dissolved in 2490 mg, 2470 mg, 2450 mg and 2400 mg of ethanol, respectively, thus preparing PTIO ethanol solutions having a concentration of 0.4% by weight, 1.2% by weight, 2% by weight and 4% by weight, respectively. To each of the ethanol solutions, lg of coconut shell activated carbon (available from Japan Envirochemicals Ltd; a specific surface area: about 1200 m2/g), which was dried in advance by heating at 200 C in vacuo, was added, and stirred for 60 minutes using a test tube mixer.
Further, according to the present invention, there is provided a cigarette provided with a cigarette filter according to the present invention.
Brief Description of Drawings FIG. 1 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 1, which will be described later in detail, together with that of a comparative example;
FIG. 2 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 2, which will be described later in detail, together with that of a comparative example;
FIG. 3 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 3, which will be described later in detail, together with that of a comparative example; and FIG. 4 is a graph showing the reduction rate of NO
in the mainstream smoke of cigarettes manufactured in Example 4, which will be described later in detail, together with that of a comparative example.
Best Mode for Carrying Out the Invention The present invention will be described in more detail below.
A cigarette filter according to the present invention comprises a cigarette filter material to which 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl (PTIO) is added.
In the cigarette filter of the present invention, PTIO, an effective ingredient for removing nitrogen oxides, is a compound known per se (see, for example, Jpn. Pat. Appln. KOKAI Publication No. 9-43153).
In the cigarette filter of the present invention, use may be made, as the filter material, of cellulose acetate fiber tow, filter paper and porous particulate carrier such as activated carbon. In the case where cellulose acetate fiber tow is used as the filter material, PTIO can be added by spraying PTIO onto the fiber tow. When filter paper is used, PTIO can be impregnated into the filter paper. The filter material thus obtained can be wrapped with a wrapper by an ordinary method, and connected to an end of a cigarette.
In the case where a porous particulate carrier such as activated carbon is used as the filter material, PTIO is impregnated in the porous particulate carrier, and then the thus obtained PTIO-carrying particles are filled in a cavity as is known in the art or added to a tow. More specifically as to the cavity filling, a plain filter is provided to either end of a filter wrapper paper pipe. The PTIO-carrying particles are filled in the cavity between these plain filters.
On the other hand, the addition to the tow is carried out by a method similar to that used for charcoal filters of commercially available cigarettes, that is, the PTIO-carrying particles are dispersed between the fibers of the acetate filter.
PTIO is added preferably in an amount of 3 to 10 parts by weight, particularly preferably, 5 to 7 parts by weight based on 100 parts by weight of the filter material. PTIO significantly reduces the amount of NO
and NOx contained in the cigarette mainstream smoke even under wet conditions, which are equivalent to the actual smoking conditions.
The present invention will be described by way of Examples, but the present invention should not be limited to the Examples.
Example 1 <Preparation of PTIO-impregnated activated carbon>
10 mg, 30 mg, 50 mg and 100 mg of PTIO (available from Wako Pure Chemical Industries, Ltd.; CAS:
18390-00-6) were completely dissolved in 2490 mg, 2470 mg, 2450 mg and 2400 mg of ethanol, respectively, thus preparing PTIO ethanol solutions having a concentration of 0.4% by weight, 1.2% by weight, 2% by weight and 4% by weight, respectively. To each of the ethanol solutions, lg of coconut shell activated carbon (available from Japan Envirochemicals Ltd; a specific surface area: about 1200 m2/g), which was dried in advance by heating at 200 C in vacuo, was added, and stirred for 60 minutes using a test tube mixer.
5 Thereafter, the solvent ethanol was removed in a water bath of 50 C while blowing nitrogen gas into the solution, and then the resultant material was dried by heating at 120 C in vacuo. Thus, PTIO-impregnated activated carbon was obtained. It was measured that the PTIO-impregnated activated carbon obtained using the ethanol solution having a PTIO concentration of 0.4% by weight was impregnated with PTIO in an amount corresponding to 1% of the weight of activated carbon (PTIO-impregnated activated carbon I), the PTIO-impregnated activated carbon obtained using the ethanol solution having a PTIO concentration of 1.2% by weight was impregnated with PTIO in an amount corresponding to 3% of the weight of activated carbon (PTIO-impregnated activated carbon II), the PTIO-impregnated activated carbon obtained using the ethanol solution having a PTIO concentration of 2% by weight was impregnated with PTIO in an amount corresponding to 5% of the weight of activated carbon (PTIO-impregnated activated carbon III), and the PTIO-impregnated activated carbon obtained using the ethanol solution having a PTIO
concentration of 4% by weight was impregnated with PTIO
in an amount corresponding to 10% of the weight of activated carbon (PTIO-impregnated activated carbon IV).
<Manufacture of Cigarette Samples>
Commercially available American blend tobacco rods were used as tobacco rods. Filter plugs in which PTIO-impregnated activated carbons obtained above were cavity-filled were attached to one-end sides of the tobacco rods respectively. The filter plugs had a plain filter (made of cellulose acetate fiber tow) having a length of 5 mm provided on both ends of each plug and 0 mg, 50 mg, 100 mg and 200 mg of PTIO-impregnated activated carbon particles were filled at closest packing. The plugs had no ventilation holes.
<Measurements of Amount of NO and NOx>
The cigarette samples obtained above were set on a smoking machine (RM 26 available from Borgwaldt GmbH), and were burnt under the following conditions.
Smoke suction volume: 17.5 mL/puff Puffing time: 2 seconds/puff Puff interval: 58 seconds Number of times of puffing: 7 times For each of 7 times of puffing (smoke suction) and an idle running puff (one time after completion of burning), smoke having passed though the Cambridge filter was diluted 20-fold (by collecting it with an aluminum bag in which 17.5 mL x 19 = 332.5 mL of nitrogen gas was injected in advance). Then, the concentrations of NO and NOx were measured by the chemiluminescent method. The weights of NO and NOx were calculated from the concentrations obtained above, and the calculated weight values of all the puffs and idle-running puff were summed up to obtain a delivery amount per cigarette. For comparison purpose, a similar cigarette sample was manufactured with activated carbon not impregnated with PTIO, and the delivery amount per cigarette was obtained in a similar manner. The NO and NOx reduction rates were calculated based on the NO and NOx delivery amounts per cigarette obtained similarly for a plain cigarette without the filter connected thereto. The NO reduction rate (o) of each sample was illustrated in FIG. 1. In FIG. 1, a line indicates the results obtained in the case where the PTIO-impregnated activated carbon I was used, a line b indicates the results obtained in the case where the PTIO-impregnated activated carbon II was used, a line c indicates the results obtained in the case where the PTIO-impregnated activated carbon III was used, a line d indicates the results obtained in the case where the PTIO-impregnated activated carbon IV was used, and a line e indicates the results obtained in the case where the activated carbon with no PTIO impregnated was used.
From the results shown in FIG. 1, it can be seen that the filters that contain PTIO-impregnated activated carbon particles significantly reduce the amount of NO as compared to the activated carbon particles that do not contain PTIO. In particular, the activated carbons carrying 3 to 10% by weight of PTIO
have a remarkably high NO reduction effect. It should be noted that the NOx reduction rate exhibited a tendency similar to those of the above-described NO
reduction rates.
Example 2 PTIO-impregnated activated carbon II prepared in Example 1 was subjected to moisture absorption until it reaches the equilibrium at a temperature of 22 C and a relative humidity of 60%, and thus moisture-absorbed PTIO-impregnated activated carbon III was obtained.
Cigarettes were manufactured as in Example 1 except that the moisture-absorbed PTIO-impregnated activated carbon III was used, and the NO reduction rate in the mainstream smoke was obtained. The results were illustrated in FIG. 2. In FIG. 2, a line a indicates the results obtained in the case where the moisture-absorbed PTIO-impregnated activated carbon III was used, and a line b indicates the results obtained in the case where activated carbon obtained by similar moisture absorption except that PTIO was not impregnated. From the results shown in FIG. 2, it can be seen that when the moisture absorption is carried out, the NO reduction rate is slightly lowered as compared to the case of the dry PTIO-impregnated activated carbon III (Example 1); however the NO amount is significantly reduced as compared to the case where simple activated carbon is used, indicating that PTIO
will sufficiently have an effect of reducing the NO
amount, even under actual smoking (corresponding to filter ventilation of 500). It should be noted also here that the NOx reduction rate exhibited a tendency similar to that of the NO reduction rate described above.
Example 3 The cigarette samples manufactured in Example 1 were burnt under the same conditions as in Example 1 except that the smoke suction volume was changed to 35 mL/puff. Cigarette samples using activated carbon not impregnated with PTIO were burnt also at a smoke suction volume of 35 mL/puff. The NO reduction rate in the mainstream smoke was calculated. The results are illustrated in FIG. 3. In FIG. 3, a line a indicates the results obtained in the case where the PTIO-impregnated activated carbon III was used, and a line b indicates the results obtained in the case where the activated carbon without PTIO was used. From the results shown in FIG. 3, it can be seen that when the smoke suction volume is increased, the NO reduction rate is lowered as compared to the case of Example 1;
however the samples using the PTIO-impregnated activated carbon III exhibits a significantly higher NO
reduction rate than that of the cigarette samples using the activated carbon without PTIO. It should be noted also here that the NOx reduction rate exhibited a 5 tendency similar to that of the NO reduction rate described above.
Example 4 Cigarette samples similar to those of Example 2 (which used moisture-absorbed PTIO) were burnt under 10 the same conditions as those in Example 3, and the NO
reduction rate in the mainstream smoke was calculated.
With regard to cigarette samples using activated carbon not impregnated with PTIO, the NO reduction rate in the mainstream smoke was calculated. The results were illustrated in FIG. 4. In FIG. 4, a line a indicates the results obtained in the case where the PTIO-impregnated activated carbon was used, and a line b indicates the results obtained in the case where the activated carbon without PTIO was used. From the results shown in FIG. 4, it can be seen that when the smoke suction volume is increased, the NO reduction rate is lowered as compared to the case of Example 2;
however the samples using the PTIO-impregnated activated carbon exhibits a significantly higher NO
reduction rate than that of the cigarette samples using the activated carbon without PTIO. It should be noted also here that the NOx reduction rate exhibited a tendency similar to that of the NO reduction rate described above.
As described above, the cigarette filter of the present invention can efficiently remove nitrogen oxides from the tobacco mainstream smoke.
concentration of 4% by weight was impregnated with PTIO
in an amount corresponding to 10% of the weight of activated carbon (PTIO-impregnated activated carbon IV).
<Manufacture of Cigarette Samples>
Commercially available American blend tobacco rods were used as tobacco rods. Filter plugs in which PTIO-impregnated activated carbons obtained above were cavity-filled were attached to one-end sides of the tobacco rods respectively. The filter plugs had a plain filter (made of cellulose acetate fiber tow) having a length of 5 mm provided on both ends of each plug and 0 mg, 50 mg, 100 mg and 200 mg of PTIO-impregnated activated carbon particles were filled at closest packing. The plugs had no ventilation holes.
<Measurements of Amount of NO and NOx>
The cigarette samples obtained above were set on a smoking machine (RM 26 available from Borgwaldt GmbH), and were burnt under the following conditions.
Smoke suction volume: 17.5 mL/puff Puffing time: 2 seconds/puff Puff interval: 58 seconds Number of times of puffing: 7 times For each of 7 times of puffing (smoke suction) and an idle running puff (one time after completion of burning), smoke having passed though the Cambridge filter was diluted 20-fold (by collecting it with an aluminum bag in which 17.5 mL x 19 = 332.5 mL of nitrogen gas was injected in advance). Then, the concentrations of NO and NOx were measured by the chemiluminescent method. The weights of NO and NOx were calculated from the concentrations obtained above, and the calculated weight values of all the puffs and idle-running puff were summed up to obtain a delivery amount per cigarette. For comparison purpose, a similar cigarette sample was manufactured with activated carbon not impregnated with PTIO, and the delivery amount per cigarette was obtained in a similar manner. The NO and NOx reduction rates were calculated based on the NO and NOx delivery amounts per cigarette obtained similarly for a plain cigarette without the filter connected thereto. The NO reduction rate (o) of each sample was illustrated in FIG. 1. In FIG. 1, a line indicates the results obtained in the case where the PTIO-impregnated activated carbon I was used, a line b indicates the results obtained in the case where the PTIO-impregnated activated carbon II was used, a line c indicates the results obtained in the case where the PTIO-impregnated activated carbon III was used, a line d indicates the results obtained in the case where the PTIO-impregnated activated carbon IV was used, and a line e indicates the results obtained in the case where the activated carbon with no PTIO impregnated was used.
From the results shown in FIG. 1, it can be seen that the filters that contain PTIO-impregnated activated carbon particles significantly reduce the amount of NO as compared to the activated carbon particles that do not contain PTIO. In particular, the activated carbons carrying 3 to 10% by weight of PTIO
have a remarkably high NO reduction effect. It should be noted that the NOx reduction rate exhibited a tendency similar to those of the above-described NO
reduction rates.
Example 2 PTIO-impregnated activated carbon II prepared in Example 1 was subjected to moisture absorption until it reaches the equilibrium at a temperature of 22 C and a relative humidity of 60%, and thus moisture-absorbed PTIO-impregnated activated carbon III was obtained.
Cigarettes were manufactured as in Example 1 except that the moisture-absorbed PTIO-impregnated activated carbon III was used, and the NO reduction rate in the mainstream smoke was obtained. The results were illustrated in FIG. 2. In FIG. 2, a line a indicates the results obtained in the case where the moisture-absorbed PTIO-impregnated activated carbon III was used, and a line b indicates the results obtained in the case where activated carbon obtained by similar moisture absorption except that PTIO was not impregnated. From the results shown in FIG. 2, it can be seen that when the moisture absorption is carried out, the NO reduction rate is slightly lowered as compared to the case of the dry PTIO-impregnated activated carbon III (Example 1); however the NO amount is significantly reduced as compared to the case where simple activated carbon is used, indicating that PTIO
will sufficiently have an effect of reducing the NO
amount, even under actual smoking (corresponding to filter ventilation of 500). It should be noted also here that the NOx reduction rate exhibited a tendency similar to that of the NO reduction rate described above.
Example 3 The cigarette samples manufactured in Example 1 were burnt under the same conditions as in Example 1 except that the smoke suction volume was changed to 35 mL/puff. Cigarette samples using activated carbon not impregnated with PTIO were burnt also at a smoke suction volume of 35 mL/puff. The NO reduction rate in the mainstream smoke was calculated. The results are illustrated in FIG. 3. In FIG. 3, a line a indicates the results obtained in the case where the PTIO-impregnated activated carbon III was used, and a line b indicates the results obtained in the case where the activated carbon without PTIO was used. From the results shown in FIG. 3, it can be seen that when the smoke suction volume is increased, the NO reduction rate is lowered as compared to the case of Example 1;
however the samples using the PTIO-impregnated activated carbon III exhibits a significantly higher NO
reduction rate than that of the cigarette samples using the activated carbon without PTIO. It should be noted also here that the NOx reduction rate exhibited a 5 tendency similar to that of the NO reduction rate described above.
Example 4 Cigarette samples similar to those of Example 2 (which used moisture-absorbed PTIO) were burnt under 10 the same conditions as those in Example 3, and the NO
reduction rate in the mainstream smoke was calculated.
With regard to cigarette samples using activated carbon not impregnated with PTIO, the NO reduction rate in the mainstream smoke was calculated. The results were illustrated in FIG. 4. In FIG. 4, a line a indicates the results obtained in the case where the PTIO-impregnated activated carbon was used, and a line b indicates the results obtained in the case where the activated carbon without PTIO was used. From the results shown in FIG. 4, it can be seen that when the smoke suction volume is increased, the NO reduction rate is lowered as compared to the case of Example 2;
however the samples using the PTIO-impregnated activated carbon exhibits a significantly higher NO
reduction rate than that of the cigarette samples using the activated carbon without PTIO. It should be noted also here that the NOx reduction rate exhibited a tendency similar to that of the NO reduction rate described above.
As described above, the cigarette filter of the present invention can efficiently remove nitrogen oxides from the tobacco mainstream smoke.
Claims (4)
1. A cigarette filter comprising a cigarette filter material to which 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl is added.
2. The cigarette filter according to claim 1, characterized in that the filter material comprises activated carbon particles.
3. The cigarette filter according to claim 1, wherein 3 to 10 parts by weight of 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl is added based on 100 parts by weight of the filter material.
4. A cigarette provided with a cigarette filter according to claim 1.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004219103 | 2004-07-27 | ||
| JP2004-219103 | 2004-07-27 | ||
| PCT/JP2005/013659 WO2006011486A1 (en) | 2004-07-27 | 2005-07-26 | Filter for cigarette and cigarette having same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2573030A1 CA2573030A1 (en) | 2006-02-02 |
| CA2573030C true CA2573030C (en) | 2009-05-12 |
Family
ID=35786237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002573030A Expired - Fee Related CA2573030C (en) | 2004-07-27 | 2005-07-26 | Cigarette filter and cigarette provided with the same |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20070113863A1 (en) |
| EP (1) | EP1782704A4 (en) |
| JP (1) | JP4262279B2 (en) |
| CN (1) | CN1988816A (en) |
| CA (1) | CA2573030C (en) |
| RU (1) | RU2336791C1 (en) |
| TW (1) | TWI296506B (en) |
| UA (1) | UA87149C2 (en) |
| WO (1) | WO2006011486A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1905300A1 (en) * | 2006-09-30 | 2008-04-02 | Bayer CropScience AG | Water dispersible agrochemical formulations comprising polyalkoxytriglycerides as penetration promoters |
| CN105167186B (en) * | 2015-07-10 | 2019-02-19 | 湖北中烟工业有限责任公司 | A cigarette filter tip additive for reducing aromatic phenol content in smoke |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1235880A (en) * | 1968-12-11 | 1971-06-16 | British American Tobacco Co | Improvements relating to tobacco-smoke filters |
| US4163452A (en) * | 1977-12-01 | 1979-08-07 | British-American Tobacco Company Limited | Tobacco-smoke filters |
| US4637408A (en) * | 1983-08-25 | 1987-01-20 | Philip Morris Incorporated | Filter material for the removal of nitric oxide |
| BR8903470A (en) * | 1988-07-15 | 1990-03-06 | Mo Tabachnaya Fabrika Yava | COMPOSITION AND PROCESS FOR ABSORPTION OF NITROGEN OXIDE FROM TOBACCO SMOKE, FILTER TO PURIFY TOBACCO SMOKE FROM NITROGEN OXIDE AND IMPREGNATION PROCESS FROM A BASE OF A FILTER |
| JPH06105675A (en) * | 1992-09-29 | 1994-04-19 | Matsushita Electric Ind Co Ltd | Cigarette filter |
| SE500634C2 (en) * | 1992-12-22 | 1994-08-01 | House Of Blend Ab | fILTER TIP |
| AU693099B2 (en) * | 1994-06-27 | 1998-06-25 | Golden Filter S.A. Filter Research and Development Corporation | Removal of noxious oxidants and carcinogenic volatile nitrosocompounds from cigarette smoke using biological substances |
| US5671758A (en) * | 1994-12-13 | 1997-09-30 | Rongved; Paul I. | Catalytic cigarette smoke cleaning devise and process |
| ITPI20010014A1 (en) * | 2001-03-05 | 2002-09-05 | Ivo Pera | COMPOUND FOR FILTERS FOR CIGARETTES, OR OTHER SMOKING ITEMS, BASED ON ANTIOXIDANT SUBSTANCES AND THE FILTER SO OBTAINED |
| JP4373634B2 (en) * | 2001-11-02 | 2009-11-25 | 焼津水産化学工業株式会社 | Nitric oxide scavenger |
-
2005
- 2005-07-26 EP EP05767374A patent/EP1782704A4/en not_active Withdrawn
- 2005-07-26 CA CA002573030A patent/CA2573030C/en not_active Expired - Fee Related
- 2005-07-26 RU RU2007103157/12A patent/RU2336791C1/en not_active IP Right Cessation
- 2005-07-26 CN CNA2005800253381A patent/CN1988816A/en active Pending
- 2005-07-26 WO PCT/JP2005/013659 patent/WO2006011486A1/en not_active Ceased
- 2005-07-26 JP JP2006527802A patent/JP4262279B2/en not_active Expired - Fee Related
- 2005-07-26 UA UAA200700839A patent/UA87149C2/en unknown
- 2005-07-27 TW TW094125366A patent/TWI296506B/en active
-
2007
- 2007-01-16 US US11/653,296 patent/US20070113863A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CA2573030A1 (en) | 2006-02-02 |
| RU2007103157A (en) | 2008-08-10 |
| JP4262279B2 (en) | 2009-05-13 |
| RU2336791C1 (en) | 2008-10-27 |
| UA87149C2 (en) | 2009-06-25 |
| JPWO2006011486A1 (en) | 2008-05-01 |
| EP1782704A1 (en) | 2007-05-09 |
| EP1782704A4 (en) | 2009-07-29 |
| WO2006011486A1 (en) | 2006-02-02 |
| CN1988816A (en) | 2007-06-27 |
| US20070113863A1 (en) | 2007-05-24 |
| TW200614927A (en) | 2006-05-16 |
| TWI296506B (en) | 2008-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |