WO2020153491A1

WO2020153491A1 - Filter for smoking article

Info

Publication number: WO2020153491A1
Application number: PCT/JP2020/002586
Authority: WO
Inventors: 啓之久保田; 道弘稲垣; 敏隆梅津
Original assignee: 日本たばこ産業株式会社
Priority date: 2019-01-25
Filing date: 2020-01-24
Publication date: 2020-07-30
Also published as: EP3915407A1; TW202038750A; US20210321667A1; JPWO2020153491A1; EP3915407A4; CN113347895A

Abstract

The present invention addresses the problem of providing a filter for a smoking article that can reduce a stimulus component such as formaldehyde, and that does not reduce any more than necessary a component affecting the smoke flavor included in mainstream smoke. This problem is solved by providing a smoking article filter comprising a filter segment that has a porous material containing: hydrotalcite particles; and a non-fibrous binding resin.

Description

Filter for smoking articles

The present invention relates to a filter for smoking articles.

When using a cigarette with a filter, of the components contained in tobacco smoke, the filter is given the function of removing only the unnecessary components during smoking, and the function of giving a specific flavor to the tobacco smoke. Research and development for applying to filters are being actively conducted.
As a means for achieving that, it is known to prepare a porous substance containing a material for adjusting components contained in cigarette smoke and use the porous substance as a constituent material of a filter (for example, Patent Document 1). 1-3).
Active particles (Patent Documents 1 to 3) are exemplified as materials for adjusting the components contained in cigarette smoke.
Also known is a cigarette filter having a filter plug including a filter medium in which filtration rate control particles selected from cellulose particles, cellulose triacetate particles and a mixture thereof are dispersed in a tow of cellulose acetate fibers (Patent Document 4). ).

Japanese Patent Publication No. 2016-510993 Japanese Patent Publication No. 2014-509833 JP, 2013-215196, A Japanese Patent Publication No. 2016-510995

When the porous material containing active particles described in Patent Documents 1 to 3 is used as a constituent material of a filter, stimulating components such as carbon monoxide, phenol and formaldehyde in cigarette smoke can be reduced. However, other mainstream smoke components are also reduced.
In addition, in the filter medium described in Patent Document 4, the filtration rate control particles such as cellulose particles are dispersed inside the tow of the cellulose acetate fiber, and the tow ratio of the cellulose acetate fiber in the filter is large, The components of mainstream smoke may be reduced more than necessary.

As described above, in the techniques described in Patent Documents 1 to 4, in addition to stimulating components such as carbon monoxide, phenol, and formaldehyde, the components of mainstream smoke are also reduced, so that users can feel satisfaction when smoking. May not be given.

From these facts, the present invention provides a filter for smoking articles, which can reduce irritating components such as formaldehyde, and in which the components that influence the flavor and taste contained in mainstream smoke are not unnecessarily reduced. ..

As a result of intensive studies by the present inventors, it was found that a filter for smoking articles, which comprises a filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin, can solve the above-mentioned problems. Reached

That is, the present invention is as follows.
[1] A filter for a smoking article, comprising a filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin.
[2] The filter for smoking articles according to [1], wherein the porous material further contains cellulose particles.
[3] The filter for smoking articles according to [2], wherein the weight ratio of the hydrotalcite particles to the cellulose particles is 10:90 to 30:70.
[4] The filter for smoking articles according to any one of [1] to [3], wherein the hydrotalcite compound constituting the hydrotalcite particles is represented by the following formula (1).
M ²⁺ _1-x M ³⁺ _x (OH) ₂ (A ^n- ) _x/n ·mH ₂ O (1)
(Here, M ²⁺ is a divalent metal ion selected from the group consisting of Mg, Zn, Ni and Ca, M ³⁺ is an Al ion, A ⁿ⁻ is CO ₃ , SO ₄ , OOC—COO, Cl. , Br, F, NO ₃ , Fe(CN) ₆ ³⁻ , Fe(CN) ₆ ⁴⁻ , phthalic acid, isophthalic acid, terephthalic acid, maleic acid, alkenyl acid and its derivatives, malic acid, salicylic acid, acrylic acid, An n-valent anion selected from the group consisting of adipic acid, succinic acid, citric acid and sulfonic acid, with 0.1<x<0.4 and 0<m<2)
[5] The smoking article filter according to any one of [1] to [4], wherein the hydrotalcite particles have an average particle diameter of 200 to 800 μm.
[6] The smoking article filter according to any one of [1] to [5], wherein the non-fibrous binder resin is a thermoplastic resin.
[7] The smoking article according to any one of [1] to [6], wherein the filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin does not contain a plasticizer. filter.
[8] The weight ratio of the hydrotalcite particles to the non-fibrous binder resin in the porous body is 70:30 to 80:20, according to any one of [1] to [7]. Filter for smoking articles.

ADVANTAGE OF THE INVENTION According to this invention, the stimulating component like formaldehyde can be reduced, and the component etc. which influence the flavor and taste contained in mainstream smoke can not be reduced more than necessary, and the smoking article filter etc. can be provided. ..

It is a figure which shows the measurement result of the ratio of the permeation|transmission amount of the semivolatile component standardized by the amount of crude tar. It is a figure which shows the measurement result of the permeation|transmission amount of the formaldehyde standardized by the amount of crude tar. It is a schematic diagram showing an example of an embodiment of a filter for smoking articles. It is a schematic diagram showing another example of an embodiment of a filter for smoking articles. It is a schematic diagram showing a measuring device of formaldehyde.

Hereinafter, the present invention will be described in detail with reference to embodiments and exemplifications, but the present invention is not limited to the following embodiments and exemplifications. It can be changed and implemented.

<Hydrotalcite particles>
A smoking article filter according to an embodiment of the present invention includes a filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin.
The hydrotalcite particles have completely different properties from the active particles described in Patent Documents 1 to 3 listed above.
Specifically, while the active particles described in Patent Documents 1 to 3 have a property of adsorbing a component that contributes to flavor and taste or a property of causing a chemical reaction, the present invention The hydrotalcite particles used in the above embodiment have lower ability to adsorb components contributing to flavor and taste than the active particles described in Patent Documents 1 to 3 and to components contributing to flavor and taste. It does not cause a chemical reaction.
Further, the hydrotalcite particles used in the present embodiment have a higher adsorption capacity for formaldehyde, which is a stimulating component, than the cellulose particles described in Patent Document 4.

Hydrotalcite particles are particles of a known compound having a layered structure similar to that of hydrotalcite, and for example, WO 03/056947 can be referred to.

The hydrotalcite compound forming the hydrotalcite particles can be specifically represented by the following general formula (1).
M ²⁺ _1-x M ³⁺ _x (OH) ₂ (A ^n- ) _x/n ·mH ₂ O (1)
(Here, M ²⁺ is a divalent metal ion selected from the group consisting of Mg, Zn, Ni and Ca, M ³⁺ is an Al ion, A ⁿ⁻ is CO ₃ , SO ₄ , OOC—COO, Cl. , Br, F, NO ₃ , Fe(CN) ₆ ³⁻ , Fe(CN) ₆ ⁴⁻ , phthalic acid, isophthalic acid, terephthalic acid, maleic acid, alkenyl acid and its derivatives, malic acid, salicylic acid, acrylic acid, An n-valent anion selected from the group consisting of adipic acid, succinic acid, citric acid and sulfonic acid, with 0.1<x<0.4 and 0<m<2)

In the above general formula, M ²⁺ is Mg ion, M ³⁺ is Al ion, A ⁿ⁻ is CO ₃ ²⁻ or SO ₄ ²⁻ , and x is 0.1<x<. It is preferred that 0.4 and m be 0<m<2. The Mg-Al hydrotalcite compound is stable when x is in the range of 0.20 to 0.33. Most preferably, the above general formula is Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O.

The Mg-Al hydrotalcite compound is obtained by adding an alkali carbonate or an alkali carbonate and a caustic alkali to an aqueous solution of a water-soluble aluminum salt selected from aluminum sulfate, aluminum acetate, and alum and an aqueous solution of magnesium salt, The reaction mixture can be produced by maintaining the pH of the reaction mixture at 8.0 or higher. Particles of the hydrotalcite compound can be obtained by pulverizing and classifying the obtained hydrotalcite compound.

The hydrotalcite particles can be granulated and classified and processed into a preferable particle size. As a granulation method, granulation by extrusion molding or granulation by compression molding is preferable because particles having a BET specific surface area of 500 m ² /g or less are easily produced. Particularly, granulation by extrusion molding is preferable because particles having a BET specific surface area of 100 m ² /g or less are easily formed.
The BET specific surface area of the hydrotalcite particles is preferably 1 to 200 m ² /g.
The average particle size of the hydrotalcite particles is preferably 200 to 800 μm. This average particle diameter is an average of secondary particles of hydrotalcite particles. Such a particle size contributes to good adsorptivity for semi-volatile components. The average particle diameter can be measured using an image analysis type particle size distribution measuring device (for example, Camsizer X2 manufactured by Retsch Technology).

The “components that contribute to the flavor and taste” are semi-volatile components contained in tobacco smoke, and more specifically, limonene, 2,5-dimethylpyrazine, 3-vinylpyridine, 3 -Butylpyridine, phenylethyl alcohol, indole can be mentioned.
Hydrotalcite particles according to an embodiment of the present invention, when used in a filter for smoking articles, a component that contributes to flavor and taste, specifically the semi-volatile component described above, relative to the crude tar of cigarette smoke. Therefore, it is not selectively reduced.

The porous material included in the filter segment according to the embodiment of the present invention may include cellulose particles in addition to the above hydrotalcite particles.
Cellulose particles can be prepared by subjecting commercially available cellulose powder such as microcrystalline cellulose as a raw material to compression molding with a compression-type granulating device, crushing the obtained molded product, and classifying. Cellulose particles can be produced with reference to WO 2013/084661. Alternatively, a commercially available cellulose molded body may be used.
The cellulose particles may have a volume-based median diameter (D50) of 100 to 1700 μm, preferably 200 to 1500 μm, and more preferably 300 to 1300 μm.
The median diameter (D50) can be measured by a laser diffraction/scattering particle size distribution (particle size distribution) measuring device.
The bulk density of the cellulose particles may be 0.05 to 1.00 g/cc, preferably 0.10 to 0.90 g/cc, and 0.15 to 0.85 g/cc. Is more preferable.
The bulk density of the cellulose particles can be measured with, for example, a powder tester PT-X manufactured by Hosokawa Micron Corporation.
The BET specific surface area of the cellulose particles is preferably 10 m ² /g or less, more preferably the detection limit or less. The lower limit value of the BET specific surface area of the cellulose particles may be more than 0 m ² /g.
The above-mentioned cellulosic particles, like the above-mentioned hydrotalcite particles, have the ability not to selectively reduce the above-mentioned semi-volatile components contained in the tobacco smoke with respect to the crude tar of the tobacco smoke.
In addition to the above-mentioned hydrotalcite particles, by using the above-mentioned cellulose particles in combination, even if the length of the filter segment containing them is not adjusted, by adjusting the blending ratio of these, it is caused by cigarette smoke. The desired flavor and taste can be designed.
When the above hydrotalcite particles and cellulose particles are used in combination, the weight ratio thereof is preferably 10:90 to 30:70, and more preferably 10:90 to 20:80.
Further, it is preferable that the cellulose particles have a particle size of 10 to 70 mesh based on JIS Z8801-1 (2006). With such a particle size range, the cellulose particles can be present in the porous material without any bias, and the semi-volatile component is not selectively reduced.

The hydrotalcite particles and the cellulose particles are thermally stable at 150°C. It should be noted that "thermally stable" refers to the ability not to selectively reduce the above-mentioned components contributing to flavor and taste with respect to the crude tar of cigarette smoke before and after heating to 150°C. It means that there is no difference and that it does not deform when heated to 150°C.
Conventionally, hydrotalcite particles were not considered to be so resistant to heat, but the present inventors have found that hydrotalcite particles do not lose their properties even when heated to 150°C. ..

The porous material that the filter segment according to the embodiment of the present invention has, in addition to the above-mentioned hydrotalcite particles, within a range that does not impair the effects of the present invention, together with the cellulose particles, or instead of the cellulose particles, another inert The particles may or may not be included.

In the present specification, "not selectively reducing the crude tar of cigarette smoke" means that the delivery amount of the semivolatile component shown below is performed for the filter for food articles according to the embodiment of the present invention. It means that the delivery amount of the semi-volatile component standardized by the amount of crude tar obtained by the measuring method is generally larger than that of a general smoking article filter shown below.
As a general filter (control), a cellulose acetate fiber bundle containing about 7% by weight of triacetin as a plasticizer (ventilation resistance is 85 mmH ₂ O/27 mm) is used.

(Smoking test)
The permeation amount (delivery amount) of the semivolatile component is measured as follows.
Using an automatic smoker (RM20D made by Borgwaldt KC Inc.), smoke automatically with a smoke absorption capacity of 35.0 mL/2 seconds, smoke absorption time of 2 seconds/puff, and smoke absorption frequency of 1 puff/min, and filter crude tar with a Cambridge filter ( Smoke collected by Borgwaldt KC Inc. CM-133) and passed through the Cambridge filter is collected in 10 mL of methanol cooled to −70° C. with a refrigerant composed of dry ice and isopropanol. The methanol solution contains d-32 pentadecane as an internal standard substance at a concentration of 5 μg/mL.

The Cambridge filter that collects the crude tar and 10 mL of the methanol solution that collects the tobacco smoke are transferred to a serum bottle and shaken for 30 minutes. After shaking, the supernatant is collected and used as a sample for analysis.
The analysis sample is analyzed by gas chromatograph mass spectrometry (GC-MSD). Agilent 7890A (Agilent Technologies Inc.) is used for GC and Agilent 5975C (Agilent Technologies Inc.) is used for MSD.

<Binder resin>
The porous material included in the filter segment included in the smoking article filter according to the embodiment of the present invention includes a non-fibrous binder resin. By "non-fibrous" is meant that it is not fibrous, such as cellulose acetate tow.
Examples of the binder resin include thermoplastic resins.
As the thermoplastic resin, polyolefin, polyester, polyamide (or nylon), polyacryl, polystyrene, polyvinyl, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), any copolymer thereof, any derivative thereof And any combination thereof, but not limited thereto. Examples of polyolefins include, but are not limited to, polyethylene, polypropylene, polybutylene, polymethylpentene, any copolymer thereof, any derivative thereof, any combination thereof, and the like. Further examples of suitable polyethylenes include low density polyethylene, linear low density polyethylene, high density polyethylene, any copolymer thereof, any derivative thereof, any combination thereof, and the like.
Examples of suitable polyesters include polyethylene terephthalate, polybutylene terephthalate, polycyclohexylene dimethylene terephthalate, polytrimethylene terephthalate, any copolymer thereof, any derivative thereof, any combination thereof, and the like.
Examples of suitable polyacrylics include, but are not limited to, polymethylmethacrylate, any copolymer thereof, any derivative thereof, any combination thereof.
Examples of suitable polystyrenes include, but are not limited to, polystyrene, acrylonitrile butadiene styrene, styrene acrylonitrile, styrene butadiene, styrene maleic anhydride, any copolymer thereof, any derivative thereof, any combination thereof. ..
Examples of suitable polyvinyls include, but are not limited to, ethylene vinyl acetate, ethylene vinyl alcohol, polyvinyl chloride, any copolymer thereof, any derivative thereof, any combination thereof.

In the embodiment of the present invention, the binder resin is preferably at least one of polyethylene, a polyethylene copolymer, a polyethylene derivative, and a combination thereof.
Examples of polyethylene include GUR (registered trademark) 2000 series (2105, 2122, 2122-5, 2126), GUR (registered trademark) 4000 series (4120, 4130) as GUR (registered trademark) polymers sold by Celanese. 4150, 4170, 4012, 4122-5, 4022-6, 4050-3/4150-3), GUR (registered trademark) 8000 series (8110, 8020), GUR (registered trademark) X series (X143, X184, X168, X172, X192) can be mentioned.

The melt flow rate of the binder resin used in the embodiment of the present invention is preferably 3.5 g/10 minutes or less at 190° C. and 15 kg, and more preferably 2.0 g/10 minutes or less.
The binder resin used in the embodiment of the present invention may be in the form of particles. Particulates can include powder, pellets, or particulate forms.
When the binder resin is in the form of particles, the range of its diameter may be about 0.1 nm to 5000 μm, preferably about 10 nm to 500 μm, and more preferably about 100 nm to 300 μm.
The binder resin used in the embodiment of the present invention may have a bulk density of 0.10 g/cm ³ to 0.55 g/cm ^{3, and} a bulk density of 0.17 g/cm ³ to 0.50 g/cm ³ . It is preferably from 0.20 g/cm ³ to 0.47 g/cm ³ .

<Porous material>
The porous material according to the embodiment of the present invention is a constituent element of at least one filter segment constituting the filter for smoking article according to the embodiment of the present invention.
The porous material according to the embodiment of the present invention contains the above-mentioned hydrotalcite particles and a binder resin, and an arbitrary method can be used for its production method.
For example, the above-mentioned hydrotalcite particles (if necessary, for example, together with cellulose particles) and the binder resin are mixed and placed in a mold having an appropriate shape. The mold is heated to the melting point of the binder resin or higher, eg, in one embodiment, about 150° C. to 300° C., and the temperature is maintained for a time sufficient to heat the mold and its contents to the desired temperature. Hold.
Then, the substance is taken out of the mold and cooled to room temperature, whereby a porous material having voids formed therein can be produced.
The void volume ratio of the porous material may be 40 to 90%, for example. The void volume ratio can be calculated based on the description in Patent Document 2, and the shape of the porous material is not particularly limited, and examples thereof include a columnar shape. The length of the porous material in the ventilation direction is not particularly limited, but may be, for example, about 3 to 30 mm.
In the filter segment having the porous material according to the embodiment of the present invention, since the hydrotalcite particles are fixed in the porous material by the binder resin, the filter segment having the porous material and the filter segment are provided. During transportation of the smoking article filter or the smoking article provided with the smoking article filter, the hydrotalcite particles do not dissipate from the filter segment.
Further, since the smoking article filter according to the embodiment of the present invention includes the filter segment having the porous material, the filtration rate of tar and nicotine per ventilation resistance of the filter becomes low (it becomes easy to be delivered to the user). .. Further, when the amount of tar during smoking is constant, a filter for smoking articles having a low filtration rate and a high ventilation rate can be designed, and the amount of carbon monoxide produced can be reduced.

In the porous material according to the embodiment of the present invention, the weight ratio of the hydrotalcite particles to the non-fibrous binder resin is preferably 70:30 to 80:20. By including the hydrotalcite particles and the non-fibrous binder resin in such a range, voids can be provided inside the porous material with an appropriate porosity, and ventilation resistance and tobacco The permeation amount of semi-volatile components in smoke can be adjusted appropriately.
When the hydrotalcite particles and the cellulose particles are used in combination, the weight ratio between the total weight of these particles and the non-fibrous binder resin is 70:30 to 80:20. Is preferred.
The porous material according to the embodiment of the present invention does not need to use a plasticizer such as triacetin that has been used in conventional filters for smoking articles. This makes it possible to prevent the semi-volatile component in the cigarette smoke from being removed by being adsorbed by the plasticizer.

<Filter for smoking articles>
The smoking article filter of the present invention includes at least the filter segment having the porous material described above (hereinafter, also simply referred to as a segment having the porous material).
The filter segment having a porous material can employ the same circumferential length and ventilation length as those of a filter that constitutes a conventional cigarette with a filter.
For example, the peripheral length can be 16 to 26 mm, and preferably 24 to 26 mm. This corresponds to filter segment diameters of 5.1 to 8.3 mm and 7.6 to 8.3 mm, respectively.
The filter segment having a porous material may have the above-described circumference, and is not limited to the dimensions of the filter provided in the conventional cigarette with a filter, and the circumference suitable for other smoking articles described below and the ventilation direction. It may have a length.
The outer peripheral surface of the filter segment having a porous material may be wrapped with a filter paper roll described later.

The smoking article filter according to the embodiment of the present invention, in addition to the filter segment having the above-mentioned porous material, is similar to a filter constituting a conventional cigarette with a filter, a filter segment composed of cellulose acetate tow (hereinafter , Also known as a conventional filter segment).
As a structure according to one embodiment, a conventional filter segment is arranged on the suction end side, and a filter rod having the above-mentioned porous material is arranged between a tobacco rod having a tobacco cut and a conventional filter segment. An aspect can be mentioned.
A filter for a smoking article can be produced by connecting a filter segment having a porous material and a conventional filter segment using a molding paper. This configuration is shown in FIG. This structure is also called a dual segment.
When the dual segment is adopted, the porous material is not exposed at the suction end, so that the appearance can be improved. In addition, the porous material can be prevented from directly contacting the mouth of the user.
As a configuration according to another embodiment, a conventional filter segment is arranged on the suction end side, and a filter segment having a porous material is arranged so as to be adjacent to the conventional filter segment, and the porous material has the porous material. It is also possible to cite an aspect in which a conventional filter segment is further arranged between the filter segment and the tobacco rod having the tobacco cut. This configuration is shown in FIG. This structure is also called a triple segment. When the triple segment is adopted, it is possible to prevent the high temperature heat transmitted from the tobacco rod side from being transferred to the porous material so that the porous material is not deteriorated.
The number of filter segments constituting the smoking article filter according to the embodiment of the present invention is two as shown in FIG. 3 and three as shown in FIG. It may be an aspect having four or more filter segments. In that case, an aspect in which two or more filter segments having the above-mentioned porous material are provided can be mentioned.

3 and 4 show a configuration when a cigarette with a filter is adopted as a smoking article, the smoking article may be something other than a cigarette with a filter as described later, and the configuration in that case Can be changed appropriately. That is, an embodiment in which the filter 7 excluding the tobacco rod is appropriately used for other smoking articles as the filter for smoking articles according to the embodiment of the present invention can be mentioned.
The outer surface of the filter formed by connecting the filter segments may be wrapped with chip paper.

When the filter segment is composed of acetate tow, the single yarn fineness, total fineness, and cross-sectional shape of the acetate tow are not particularly limited.
Further, the filter segments other than the filter segment having the above-mentioned porous material may be made of a material other than acetate tow.
For acetate tow and other materials, adjustment of ventilation resistance and addition of additives (known adsorbents, fragrances, fragrance holding materials, etc.) can be appropriately designed.

For the filter for smoking articles according to the present embodiment, tip paper, molded paper, or roll paper for winding the outer surface of the filter used in known cigarettes with filters can be used. Here, the paper roll is for directly contacting the porous material, the filter tow, or the like and winding the paper in a cylindrical shape. The forming paper is used for fixing a plurality of filter sections when there are a plurality of filter segments wound with the paper roll. When the smoking article has a tobacco rod, the tipping paper is used for connecting the tobacco rod and the smoking article filter.
The tipping paper may be provided with ventilation holes for adjusting the existence ratio of tobacco smoke and air inhaled when smoking the smoking article (shown by dotted lines in the tipping paper shown in FIGS. 3 and 4). .. The arrangement of the ventilation holes is not particularly limited, and examples thereof include one arranged in one row or two rows in the circumferential direction of the smoking article. Further, there is no particular limitation on the pitch of the ventilation holes, the size of the holes, and the opening method.

<Smoking articles>
The smoking article filter according to the embodiment of the present invention can be used in the smoking articles exemplified below.
Combustion-type smoking articles that burn tobacco fillers, such as cigarettes with filters; non-combustion heating-type smoking articles that heat tobacco fillers without burning them; or flavors of tobacco fillers without burning or heating the tobacco fillers Examples include non-heated smoking articles that inhale the components. The non-combustion heating type smoking article includes a carbon heat source type aspirator (see, for example, WO2006/073065) that heats a tobacco filler with the combustion heat of a carbon heat source; an aspirator and a heating device for electrically heating the aspirator. An electric heating type aspirator (for example, see WO2010/110226); or a liquid atomizing type aspirator (for example, see WO2015/046385) that atomizes a liquid aerosol source containing a flavor and taste source by heating. To be In addition, application to a non-combustion heating type smoking article in which an aerosol generating rod is used in place of the tobacco filler and heating is performed from the outside of the aerosol generating rod to generate a flavor component is also preferable. The smoking article has a battery, an electric heating unit, and an aerosol-generating rod member that is detachably inserted. The electric heating section is a so-called heater and has a heating element. The heating element of the electric heating unit heats the aerosol-generating rod to release the flavor from the filling material of the aerosol-generating rod into the surrounding air. The heating temperature of the aerosol generation rod by the electric heating unit is, for example, 400° C. or lower. The smoking article having the aerosol-generating rod member is specifically described in Japanese Patent Nos. 4889218 and 4762247.
The filter for smoking article according to the embodiment of the present invention can be applied as a filter included in these non-combustion heating type smoking articles.
Examples of the non-heating type smoking article include a flavor inhaler that includes a suction holder and a tobacco filler filled in a main flow path of the suction holder, and inhales a flavor component of the tobacco filler (for example, WO2010/095659). See).

In the smoking article exemplified above, the smoking article filter according to the embodiment of the present invention can be appropriately used.
In this case, the shape of the filter segment having the porous material, the smoking article filter including the filter segment, and the like can be appropriately changed.

[Examples] The present invention will be described in more detail by way of examples, but the present invention is not limited to the description of the following examples unless it exceeds the gist.

(Production Example 1)
<Preparation of Filter Segment Having Porous Material Containing Hydrotalcite Particles and Polyethylene Resin>
As the hydrotalcite particles, a hydrotalcite compound represented by Mg ₆ Al ₂ (OH) ₁₆ CO ₃ .4H ₂ O was used. A product having a particle size of 250 to 500 μm was prepared by pulverizing and classifying the product of the hydrotalcite compound. Polyethylene was used as the binder resin.
Hydrotalcite particles (75 parts by weight) were mixed with polyethylene (25 parts by weight of GUR (trademark) manufactured by Celanese Co., Ltd.) which is a binder resin, placed in a mold, and heated to 200° C. for 40 minutes. The heated material was taken out of the mold and cooled to obtain a porous material 1 having a peripheral length of 23.75 mm and a length of 20 mm. The BET specific surface area of the hydrotalcite particles was 65 m ² /g.
(Production Example 2)
A porous material 2 was obtained by the same procedure as in Preparation Example 1 except that cellulose particles were used instead of hydrotalcite particles.
Cellulose particles are made of commercially available cellulose powder (Endurance MCC VE-090, manufactured by FMC Corporation) as a raw material, using a compression granulation device (roller compactor TF-208, manufactured by Freund Sangyo Co., Ltd.) to perform compression molding, pulverization and It was prepared by classification. The cellulose particles had a median diameter (D50) of 1190 μm, a bulk density of 0.832 g/cc, and a BET specific surface area was below the detection limit. The bulk density was measured with a powder tester PT-X manufactured by Hosokawa Micron Corporation.
(Production Example 3)
Porous material 3 was obtained in the same procedure as in Preparation Example 1 except that unactivated carbide particles were used instead of hydrotalcite particles, the weight thereof was 80 parts by weight, and the weight of polyethylene was 20 parts by weight. The benzene adsorption capacity of the unactivated carbide particles measured according to JIS K 1474 was 0.6.
The unactivated carbide particles are obtained by subjecting coconut husks to carbonization treatment in an inert gas atmosphere in a carbonization furnace.
(Production Example 4)
A porous material 4 was obtained in the same procedure as in Preparation Example 3 except that low activated carbon produced by a steam activation method was used instead of the hydrotalcite particles. The BET specific surface area of the low activated carbon was 725 m ² /g.
(Production Example 5)
A porous material 5 was obtained in the same procedure as in Preparation Example 3 except that activated carbon prepared by a steam activation method was used instead of the hydrotalcite particles. The BET specific surface area of the activated carbon was 1142 m ² /g.

<Test Example 1: Comparison of transmission amount of semi-volatile components>
Remove a tobacco rod containing tobacco cut from a commercially available cigarette with a filter, and connect the above-mentioned porous material (20 mm) as a filter segment and a cellulose acetate tow filter (7 mm; 5.5Y31000) in this order to the tobacco rod. Then, a cigarette with a filter for testing was prepared.
In addition, as a control, a cellulose acetate tow filter (27 mm; 2.8Y35000) was connected to the same tobacco rod as above to produce a cigarette with a filter.
A smoking test was conducted using these cigarettes with filters, and the amount of crude tar and limonene, 2,5-dimethylpyrazine, 3-vinylpyridine, 3-butylpyridine, phenylethyl as semi-volatile components from the components in cigarette smoke were used. Alcohol and indole were selected and analyzed.
The smoking test was conducted using the equipment and conditions shown above.
The result is shown in FIG. The horizontal axis of FIG. 1 indicates the type of semivolatile component. The vertical axis of FIG. 1 shows the ratio of the amount of semi-volatile component standardized by the amount of crude tar to the control in each sample, and the larger this value is, the less selective reduction occurs (permeation amount is A lot).

From the results shown in FIG. 1, it can be said that the sample provided with the porous material using hydrotalcite particles as the filter segment has a delivery amount (permeation amount) of the semivolatile component which is almost equal to or larger than that of the control. Results were obtained. Also in the case of using the cellulose particles, the permeation amount (delivery amount) of the semivolatile component was generally larger than that of the control. In the sample provided with the porous material using low activated carbon or activated carbon as the filter segment, the permeation amount (delivery amount) of the semivolatile component was generally smaller than that of the control.
These results indicate that hydrotalcite particles and cellulose particles have the ability not to selectively reduce semi-volatile components with respect to crude smoke smoke tar.

<Test Example 2: Comparison of formaldehyde adsorption capacity>
(Measurement of formaldehyde content in mainstream smoke)
The amount of formaldehyde in mainstream smoke was measured by the Canadian official method (2,4-DNPH-HPLC method), and the formaldehyde adsorption capacity was determined.
First, after 9.51 g of 2,4-dinitrophenylhydrazine (DNPH) was dissolved in 1 L of acetonitrile by heating, 5.6 mL of 60% perchloric acid was added, and ultrapure water was added to collect 2 L of the collected liquid. Prepared.
The outline of the measuring apparatus will be described with reference to FIG. As shown in FIG. 5, the DNPH collection liquid 13 is put into the collection air bottle 12. The volume of the air washing bottle 12 was 100 mL, and the amount of the DNPH collection liquid 13 was 80 mL. The air washing bottle 12 is put in an ice water bath 14 and cooled with ice. The lower end of the glass tube 15 to which the cigarette 11 is attached is immersed in the collected liquid 13 in the air washing bottle 12. The glass tube 16 and the Cambridge pad 17 are attached so as to communicate with the dead volume of the air purifier 12, and the Cambridge pad 17 and the automatic smoker 18 are connected.
The cigarette 11 is attached to the glass tube 15, and the cigarette 11 is automatically smoked under the standard smoking conditions according to ISO. That is, for one cigarette, the operation of absorbing 35 mL of smoke for 2 seconds with one empty puff is repeated at intervals of 58 seconds. Formaldehyde is derivatized by DNPH while bubbling mainstream smoke. Two cigarettes for measurement were used. At this time, the cigarettes using the particles of any of the preparation examples were adjusted to have the same pressure loss.

The derivative produced as described above was measured by high performance liquid chromatography (HPLC). First, the collection liquid is filtered and then diluted with the Trizma Base liquid (collection liquid 4 mL, Trizma Base liquid 6 mL). This liquid was measured by HPLC. The HPLC measurement conditions are as follows.
Column: HP LiChrospher 100RP-18 (5μ) 250×4mm
Guard column: HP LiChrospher 100RP-18 (5μ) 4x4mm
Column temperature: 30°C
Detection wavelength: DAD356nm
Injection volume: 20 μL
Mobile phase: three-phase gradient (solution A: ultrapure water solution containing 30% acetonitrile, tetrahydrofuran 10% and isopropanol 1%, solution B: ultrapure water containing acetonitrile 65%, tetrahydrofuran 1% and isopropanol 1%) Aqueous solution, C liquid: 100% acetonitrile).
As a control experiment, the amount of formaldehyde in mainstream smoke was measured for a cigarette (hereinafter referred to as a control) equipped with a filter containing no particles. In addition, the amount of crude tar directly collected on the Cambridge pad was also measured separately.

By substituting the measured formaldehyde amount into the following formula, the permeation amount of formaldehyde standardized by the amount of crude tar was obtained.
(Amount of formaldehyde permeation standardized by the amount of crude tar)=[{(measured amount of formaldehyde (μg/cig)/(amount of crude tar) (mg/cig)]]

The results are shown in Figure 2. The smaller the value on the vertical axis of FIG. 2, the smaller the amount of formaldehyde permeated (delivery amount) per crude tar, and the larger the amount of formaldehyde adsorbed by the particles contained in the porous material.
From the results of FIG. 2, it was found that when a porous material containing hydrotalcite particles was used, the delivery amount of formaldehyde could be suppressed to a low level, like low activated carbon and activated carbon.
From the results of Test Examples 1 and 2, the hydrotalcite particles used in the embodiment of the present invention have the ability not to selectively reduce the semi-volatile components in the tobacco smoke with respect to the crude tar of the tobacco smoke. In addition, it has been found to have the ability to selectively reduce irritating volatile components such as formaldehyde.

<Evaluation of sensory characteristics>
For each cigarette with a filter for testing in which semi-volatile components were measured, the ventilation ratio was adjusted to 37% and the tar amount was adjusted to 10 mg, and the sensory characteristics during smoking were evaluated.
As a result, in the sample including the filter segment having the porous material containing the hydrotalcite particles, the cellulose particles, or the unactivated carbide particles, the flavor and taste caused by the cigarette smoke was increased, and the irritation was reduced. On the other hand, in the sample provided with a porous material using low-activated charcoal or activated charcoal, which are active particles, as the filter segment, the irritation was reduced, but the flavor and taste due to cigarette smoke was also reduced.

From the results of the above-mentioned measurement of semi-volatile components and sensory evaluation, when the smoking article filter according to the embodiment of the present invention is used, the semi-volatile components are selectively permeated (not removed by the filter). Therefore, the characteristic flavor and taste of tobacco leaves can be more strongly given to the user.
When the smoking article filter according to the embodiment of the present invention is used, formaldehyde, which is a stimulating component, can be efficiently reduced.

1 Tobacco rod part 2 Conventional filter segment 3 Filter segment having porous material 4 Rolled paper 5 Molded paper 6 Chip paper 7 Filter

Claims

A smoking article filter including a filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin.
The smoking article filter according to claim 1, wherein the porous material further contains cellulose particles.
The smoking article filter according to claim 2, wherein the weight ratio of the hydrotalcite particles to the cellulose particles is 10:90 to 30:70.
The filter for smoking articles according to any one of claims 1 to 3, wherein the hydrotalcite compound constituting the hydrotalcite particles is represented by the following formula (1).
M 2+ 1-x M 3+ x (OH) 2 (A n- ) x/n ·mH 2 O (1)
(Here, M 2+ is a divalent metal ion selected from the group consisting of Mg, Zn, Ni and Ca, M 3+ is an Al ion, A n− is CO 3 , SO 4 , OOC—COO, Cl. , Br, F, NO 3 , Fe(CN) 6 3− , Fe(CN) 6 4− , phthalic acid, isophthalic acid, terephthalic acid, maleic acid, alkenyl acid and its derivatives, malic acid, salicylic acid, acrylic acid, An n-valent anion selected from the group consisting of adipic acid, succinic acid, citric acid and sulfonic acid, with 0.1<x<0.4 and 0<m<2)
The smoking article filter according to any one of claims 1 to 4, wherein the average particle diameter of the hydrotalcite particles is 200 to 800 µm.
The filter for smoking articles according to any one of claims 1 to 5, wherein the non-fibrous binder resin is a thermoplastic resin.
The filter for smoking articles according to any one of claims 1 to 6, wherein the filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin does not contain a plasticizer.
The smoking article according to any one of claims 1 to 7, wherein a weight ratio of the hydrotalcite particles to the non-fibrous binder resin in the porous body is 70:30 to 80:20. filter.