TW202038750A - Filter for smoking article - Google Patents

Abstract

The present invention provides a filter for smoking article that can reduce stimulating components such as formaldehyde, and would not excessively reduce the components that affect the flavor contained in the main smoke. As a solution, a filter for smoking article includes a filter section which has a porous material containing hydrotalcite particles and a non-fibrous adhesive resin.

Description

Filter for smoking articles

The present invention relates to a filter for smoking articles.

At present, the following research and development are actively carried out. When using cigarettes with filters, the filter is provided with the function of removing only the components contained in the tobacco smoke that are unnecessary during smoking, or the filter is provided in the tobacco smoke Gives the function of specific aroma and taste.

As a means for achieving this objective, it is known to prepare a porous substance containing a material for adjusting the components contained in tobacco smoke, and to use the porous substance as a constituent material of a filter (for example, Patent Documents 1 to 3).

Examples of materials for adjusting the components contained in tobacco smoke include active particles (Patent Documents 1 to 3).

In addition, a cigarette filter is known, which has a filter plug containing a filter material that disperses filterability control particles selected from the group consisting of cellulose particles, cellulose triacetate particles, and mixtures thereof. It is made of cellulose acetate fiber tow (Patent Document 4).

[Prior Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Special Publication No. 2016-510993.

Patent Document 2: JP 2014-509833 Gazette.

Patent Document 3: JP 2013-215196 A.

Patent Document 4: Japanese Special Publication No. 2016-510995.

When the porous material containing the active particles described in Patent Documents 1 to 3 is used as the constituent material of the filter, it can reduce irritating components such as carbon monoxide, phenol, or formaldehyde in tobacco smoke, but also reduce other mainstream smoke components.

In addition, in the filter material described in Patent Document 4, since filterability control particles such as cellulose particles are dispersed inside the cellulose acetate fiber tow, the ratio of the cellulose acetate fiber tow in the filter is relatively large, so There may be situations where the components of mainstream cigarettes are excessively reduced.

As mentioned above, in the techniques described in Patent Documents 1 to 4, in addition to carbon monoxide, phenol, and stimulating components such as formaldehyde, the components of mainstream cigarettes are also reduced, so users may not feel the satisfaction of smoking.

In view of this, the present invention provides a filter for smoking articles, which can reduce irritating components such as formaldehyde without excessively reducing components that affect the aroma and taste of mainstream cigarettes.

As a result of diligent review, the inventor found a filter for smoking articles that can solve the above-mentioned problems, and completed the present invention. The filter for smoking articles is provided with a filter segment that contains hydrotalcite particles and Porous material of fibrous adhesive resin.

That is, the present invention is as follows.

[1] A filter for smoking articles is provided with a filter segment, and the filter segment has a water slide Porous materials of stone particles and non-fibrous adhesive resin.

[2] The smoking article filter according to [1], wherein the porous material further contains cellulose particles.

[3] The smoking article filter according to [2], wherein the weight ratio of hydrotalcite particles to cellulose particles is 10:90 to 30:70.

[4] The smoking article filter 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 selected from the group consisting of Mg, Zn, Ni and Ca Among the divalent metal ions, M ³⁺ is Al ion, and ^An- is selected from 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, adipic acid, succinic acid, citric acid And the n-valent anion in the group formed by sulfonic acid, 0.1<x<0.4, 0<m<2).

[5] The smoking article filter according to any one of [1] to [4], wherein the average particle size of the hydrotalcite particles is 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 filter 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.

[8] The smoking article filter according to any one of [1] to [7], wherein the weight ratio of the hydrotalcite particles and the non-fibrous binder resin in the porous material is 70:30 to 80:20 .

According to the present invention, irritating components such as formaldehyde can be reduced without excessively reducing the impact. Filters for smoking articles that affect the smell and taste of mainstream cigarettes.

1: Tobacco stick part

2: The previous filter segment

3: Filter segment with porous material

4: Winding paper

5: forming paper

6: Outer paper

7: filter

11: Cigarette

12: rinse bottle

13: DNPH trapping fluid

14: Ice bath

15, 16: glass tube

17: Cambridge pad

18: automatic smoker

Figure 1 is a graph showing the measurement results of the ratio of semivolatile component penetration standardized by the amount of crude tar.

Figure 2 is a graph showing the measurement results of formaldehyde penetration standardized by the amount of crude tar.

Fig. 3 is a schematic diagram showing an example of the embodiment of the filter for smoking articles.

Fig. 4 is a schematic diagram showing another example of the embodiment of the filter for smoking articles.

Figure 5 is a schematic diagram showing the formaldehyde measuring device.

Hereinafter, the present invention will be described in detail with embodiments, examples, etc., but the present invention is not limited to the following embodiments, examples, etc., and can be modified arbitrarily without departing from the scope of the present invention.

<Hydrotalcite Particles>

The smoking article filter of the embodiment of the present invention includes a filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin.

The properties of the aforementioned hydrotalcite particles are completely different from those of the active particles described in Patent Documents 1 to 3 cited above.

Specifically, the active particles described in Patent Documents 1 to 3 have the property of being adsorbable to components that contribute to the improvement of aroma and taste, or have the property of generating chemical reactions. In contrast, the embodiments of the present invention have The adsorption of the used hydrotalcite particles helps to enhance the ability of smelling and tasting ingredients compared to patent literature The active particles described in 1 to 3 are low, and will not produce chemical reaction to the ingredients that help enhance the aroma and taste.

In addition, the hydrotalcite particles used in the present embodiment have higher adsorption energy for formaldehyde, which is an irritant component, than the cellulose particles described in Patent Document 4.

Hydrotalcite particles are particles of known compounds having the same layered structure as hydrotalcite, for example, refer to International Publication No. 03/056947.

The hydrotalcite compound constituting the hydrotalcite particles is 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 selected from the group consisting of Mg, Zn, Ni and Ca Among the divalent metal ions, M ³⁺ is Al ion, An- is selected from 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, adipic acid, succinic acid, citric acid and The n-valent anion in the group formed by sulfonic acid, 0.1<x<0.4, 0<m<2).

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

The Mg-Al hydrotalcite compound can be produced by the following operations: adding carbonate or alkali carbonate and caustic alkali to an aqueous solution of water-soluble aluminum salt selected from aluminum sulfate, aluminum acetate, and alum, or aluminum acid and water-soluble magnesium salt , Keep the pH of the reaction mixture above 8.0 and react. The obtained hydrotalcite compound is crushed and classified, thereby forming particles of the hydrotalcite compound.

The hydrotalcite particles are granulated, classified and processed to a better particle size. Regarding the granulation method, extrusion molding granulation or compression molding granulation is easy to produce particles with a BET specific surface area of 500 m ² /g or less, so it is preferred. In particular, the extrusion molding granulation system can easily produce particles with a BET specific surface area of 100 m ² /g or less, so it is preferred.

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 . The average particle size is the average of the secondary particles of the hydrotalcite particles. Such a particle size can impart good adsorbability to semi-volatile components. The average particle size can be measured using an image analysis type particle size distribution measuring device (for example, CAMSIZER X2 manufactured by Retsch Technology).

In addition, the aforementioned "components that help enhance the aroma and taste" refer to the semi-volatile components contained in tobacco smoke, more specifically, limonene, 2,5-dimethylpyrazine, and 3-vinylpyridine , 3-butylpyridine, phenylethanol, indole.

When the hydrotalcite particles of the embodiment of the present invention are used in a filter for smoking articles, they will not decrease the selectivity relative to the crude tar of tobacco smoke, which contributes to the enhancement of the aroma and taste. Specifically, it is not selective Reduce the above semi-volatile components.

The porous material of the filter segment of the embodiment of the present invention may contain cellulose particles in addition to the hydrotalcite particles.

Cellulose powder such as commercially available microcrystalline cellulose can be used as a raw material for compression molding with a compression granulator, and the resulting molded body can be crushed and classified to prepare cellulose particles. Cellulose particles can be produced with reference to International Publication No. 2013/084661. Alternatively, a commercially available cellulose molded body can be used.

The aforementioned cellulose particles may have a volume-based median diameter (D50) of 100 to 1700 μm , preferably 200 to 1500 μm , more preferably 300 to 1300 μm .

The median diameter (D50) can be measured with a laser diffraction/scattering particle size distribution (particle size distribution) measuring device.

The volume density of cellulose particles can range from 0.05 to 1.00 g/cc, preferably 0.10 to 0.90 g/cc, more preferably 0.15 to 0.85 g/cc.

The bulk density of the aforementioned cellulose particles can be measured, for example, with a powder tester PT-X manufactured by Hosokawa Micron Co., Ltd.

The BET specific surface area of the cellulose particles is preferably 10 m ² /g or less, and more preferably the detection limit or less. The lower limit of the BET specific surface area of the cellulose particles may be over 0 m ² /g.

Similar to the above-mentioned hydrotalcite particles, the above-mentioned cellulose particles have the ability to not selectively reduce the above-mentioned semi-volatile components contained in the tobacco smoke relative to the crude tar of the tobacco smoke.

In addition to the above-mentioned hydrotalcite particles, the above-mentioned cellulose particles are also used in combination, whereby even if the length of the filter segment containing these is not adjusted, the aroma caused by the tobacco smoke can be adjusted by adjusting the blending ratio. The taste design is what is expected.

When the above-mentioned hydrotalcite particles and cellulose particles are used in combination, the weight ratio of these particles is preferably 10:90 to 30:70, more preferably 10:90 to 20:80.

In addition, the aforementioned cellulose particles preferably have a particle size of 10 to 70 meshes in accordance with JIS Z 8801-1 (2006). With such a range of particle size, cellulose particles can be averaged in the porous material without selectively reducing the aforementioned semivolatile components.

The aforementioned hydrotalcite particles and cellulose particles have thermal stability at 150°C. In addition, "thermal stability" refers to: before and after heating to 150°C, there is no difference in the ability of the above-mentioned components that help to enhance the aroma and taste of the crude tar relative to the crude tar of tobacco smoke. Will not deform at 150°C.

In the past, it was not thought that hydrotalcite particles have such a degree of resistance to heat, but the present inventors found that even if the hydrotalcite particles are heated to 150°C, their properties will not be impaired.

The porous material of the filter segment of the embodiment of the present invention is in addition to the above-mentioned water slide In addition to the stone particles, other inactive particles may be included together with the cellulose particles or substituted for the cellulose particles within a range that does not impair the effects of the present invention.

In this specification, no reduction in the selectivity of crude tar relative to tobacco smoke means that the actual form of the filter for eating articles of the present invention is determined by measuring the delivery amount of the semi-volatile components shown below. The transportation volume of the above-mentioned semi-volatile components standardized by the amount of crude tar is more than that of the general smoking article filters shown below.

A general filter (control) is used for cellulose acetate fiber tows that contain about 7% by weight of triacetin as a plasticizer (air resistance is 85mmH ₂ O/27mm).

(Smoking test)

The semi-volatile component penetration (transport amount) is measured in the following way.

Use an automatic smoker (RM20D manufactured by Borgwaldt KC Inc.) to automatically smoke with a smoking capacity of 35.0mL/2 seconds, a smoking time of 2 seconds/puff, and a smoking frequency of 1 puff/minute. CM-133 manufactured by Borgwaldt KC Inc.) captures crude tar, and captures the smoke passing through the Cambridge filter in 10 mL of methanol cooled to -70°C with a refrigerant composed of dry ice and isopropanol. In addition, methanol as an internal standard substance and a concentration of 5 μ g / mL of d-32-pentadecane.

Transfer the above-mentioned Cambridge filter for capturing crude tar and 10 mL of the above-mentioned methanol solution for capturing tobacco smoke to a serum bottle and shake for 30 minutes. After shaking, the supernatant was collected and used as a sample for analysis.

The above analysis sample was analyzed by gas chromatography-mass spectrometry (GC-MSD). Agilent 7890A (Agilent Technologies Inc.) was used for GC, and Agilent 5975C (Agilent Technologies Inc.) was used for MSD.

<Adhesive Resin>

Porosity possessed by the filter segment of the smoking article filter of the embodiment of the present invention The material contains non-fibrous adhesive resin. "Non-fibrous" refers to those that are not fibrous like cellulose acetate tow.

Examples of the binder resin include thermoplastic resins.

Thermoplastic resin includes polyolefin, polyester, polyamide (or nylon), polyacrylate, polystyrene, polyethylene, polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), any of them Copolymers, derivatives of any of them, and combinations of any of them, but are not limited to these. Examples of polyolefins include polyethylene, polypropylene, polybutene, polymethylpentene, copolymers of any of them, derivatives of any of them, and combinations of any of them, but are not limited to And so on. Examples of suitable polyethylenes include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, copolymers of any of them, derivatives of any of them, and combinations of any of them.

Examples of suitable polyesters are polyethylene terephthalate, polybutylene terephthalate, polycyclohexyldimethylene terephthalate, polytrimethylene terephthalate, and any One of the copolymers, any of its derivatives, any of its combinations, etc.

Examples of suitable polyacrylates include polymethyl methacrylate, copolymers of any of them, derivatives of any of them, and combinations of any of them, but are not limited to these.

Examples of suitable polystyrenes are polystyrene, acrylonitrile/butadiene/styrene, styrene/acrylonitrile, styrene/butadiene, styrene maleic anhydride, copolymers of any of them , Derivatives of any of them, combinations of any of them, etc., but not limited to these.

Examples of suitable polyethylene include ethylene/vinyl acetate, ethylene/vinyl alcohol, polyvinyl chloride, copolymers of any of them, derivatives of any of them, combinations of any of them, etc., but not Limited to this.

In the embodiment of the present invention, the binder resin is preferably at least one of polyethylene, a copolymer of polyethylene, a derivative of polyethylene, or a combination of these.

Polyethylene can include GUR (registered trademark) polymer of GUR (registered trademark) sold by Celanese Trademark) 2000 series (2105, 2122, 2122-5, 2126), GUR (registered trademark) 4000 series (4120, 4130, 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).

The melt flow rate of the adhesive 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. Examples of the particle form include the form of powder, pellets, or fine particles.

When the binder resin is in the form of particles, the diameter may range from 0.1 nm to 5000 μm , preferably from 10 nm to 500 μm , and more preferably from 100 nm to 300 μm .

The adhesive 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 , preferably 0.17 g/cm ³ to 0.50 g/cm ³ , more preferably 0.20 g/cm ³ To 0.47g/cm ³ .

<Porous Material>

The porous material of the embodiment of the present invention is a constituent element of at least one filter segment that constitutes the smoking article filter of the embodiment of the present invention.

The porous material of the embodiment of the present invention contains the above-mentioned hydrotalcite particles and binder resin, and any method can be used for the production method.

For example, the above-mentioned hydrotalcite particles (if necessary together with, for example, cellulose particles) are mixed with a binder resin and added to a mold of an appropriate shape. The mold is heated to the melting point of the adhesive resin or above. For example, in one embodiment, it is heated to about 150°C to 300°C, and the mold and its contents are heated to the desired temperature by maintaining sufficient time and temperature.

After that, the material is taken out from the mold and cooled to room temperature, thereby making a porous material with voids formed inside.

The void volume ratio of the porous material can be, for example, 40 to 90%. The void volume ratio can be based on Patent Document 2 According to the calculation, the shape of the porous material is not particularly limited, and examples include a cylindrical shape. The length of the porous material in the ventilation direction is not particularly limited, and may be, for example, about 3 to 30 mm.

In the filter segment with a porous material in the embodiment of the present invention, the hydrotalcite particles are tightly adhered in the porous material by a binder resin, so the filter segment with the porous material, and the cigarette with the filter segment The article filter or the smoking article provided with the smoking article filter will not escape hydrotalcite particles from the filter segment during transportation.

In addition, the smoking article filter of the embodiment of the present invention is provided with a filter segment having a porous material, whereby the filtration rate of tar and nicotine per unit ventilation resistance of the filter can be reduced (it is easy to deliver to the user). In addition, when the amount of tar during smoking is fixed, a filter for smoking articles with a low filtration rate and a high ventilation ratio can be designed to reduce the amount of carbon monoxide produced.

In the porous material of the embodiment of the present invention, the weight ratio of the hydrotalcite particles and the non-fibrous binder resin is preferably 70:30 to 80:20. In this range, the hydrotalcite particles and the non-fibrous binder resin are contained, whereby voids can be provided in the porous material with an appropriate porosity, and the ventilation resistance or the penetration amount of semi-volatile components in the tobacco smoke can be appropriately adjusted.

Furthermore, when the hydrotalcite particles and the cellulose particles are used in combination, the total weight of the particles and the weight of the non-fibrous binder resin are preferably 70:30 to 80:20.

The porous material of the embodiment of the present invention does not need to use plasticizers such as glycerol triacetate used in filters for conventional smoking articles. This prevents the semi-volatile components in the tobacco smoke from being adsorbed on the plasticizer and removed.

<Filter for smoking articles>

The smoking article filter of the present invention is provided with at least a filter segment having the porous material described above (hereinafter also simply referred to as a segment having a porous material).

The filter segment with porous material can adopt the same perimeter and length in the ventilation direction as the perimeter and length in the ventilation direction of the filter constituting the conventional cigarette with filter.

For example, the circumference may be 16 to 26 mm, preferably 24 to 26 mm. This system is equivalent to 5.1 to 8.3mm and 7.6 to 8.3mm, respectively, in terms of the diameter of the filter segment.

The filter segment with the porous material may have the above-mentioned perimeter, and is not limited to the size of the filter provided in the conventional filter-attached cigarette, and may have a perimeter and length in the ventilation direction suitable for other smoking articles described later.

The filter segment with a porous material can be wrapped with a wound paper roll for the filter described later.

The smoking article filter according to the embodiment of the present invention may have a filter composed of cellulose acetate tow which is the same as the filter constituting a conventional cigarette filter with filter, in addition to the above-mentioned filter segment with a porous material. Filter segment (hereinafter referred to as the previous filter segment).

The configuration of one embodiment may include a configuration in which the conventional filter segment is arranged on the side of the mouthpiece, and the filter segment with the porous material is arranged between the tobacco rod with tobacco filaments and the conventional filter segment. kind.

The filter segment with the porous material and the conventional filter segment are connected by forming paper to make a filter for smoking articles. This structure is shown in Figure 3. This composition is also called double segment.

When the double segment is adopted, the porous material will not be exposed at the mouth end, so the appearance is good. In addition, the porous material can be prevented from directly contacting the user's mouth.

The configuration of other embodiments may include arranging the conventional filter segment on the suction port end side, and arranging the filter segment with porous material so as to be adjacent to the conventional filter segment, and placing the porous material in the filter segment. The filter segment and the tobacco rod with tobacco filaments are further equipped with the previous filter segment. This structure is shown in Figure 4. This composition is also called the triple segment. When the triple segment is used, it can prevent the high-temperature heat transmitted from the tobacco rod side from being transferred to the porous material and deterioration of the porous material.

The number of filter segments constituting the smoking article filter of the embodiment of the present invention may have 4 or more in addition to the 2 patterns shown in Fig. 3 or the 3 patterns shown in Fig. 4 The state of the filter segment. In this case, a configuration in which two or more filter segments having a porous material described above are provided can be cited.

Figures 3 and 4 show the configuration when a cigarette with a filter is used as a smoking article, but the smoking article may be anything other than the cigarette with a filter as described later, and the configuration can be changed appropriately in this case. The following embodiment can also be cited: the filter 7 for removing tobacco rods is used as the filter for smoking articles according to the embodiment of the present invention and suitably used for other smoking articles.

In addition, the outer surface of the filter formed by connecting the filter segments can be a roll of tipping 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.

Furthermore, the filter segments other than the filter segment having the porous material may be composed of materials other than acetate tow.

In the acetate tow or other materials, the adjustment of the ventilation resistance or the addition of additives (known adsorbents, fragrances, fragrance holding materials, etc.) can be appropriately designed.

For the smoking article filter of the present embodiment, the paper used for wrapping the outer surface of the filter, the forming paper, and the winding paper used for cigarettes with a known filter can be used. Here, the wound paper is in direct contact with the above-mentioned porous material, filter bundle, etc., and is used to wrap it in a cylindrical shape. The forming paper is used to fix the plurality of filter segments when there are a plurality of filter segments wrapped around the paper roll. When the smoking article has a tobacco rod, the outer layer paper is used to connect the tobacco rod and the filter for the smoking article.

The outer layer of paper may be provided with vent holes, which are used to adjust the ratio of inhaled tobacco smoke to air when smoking smoking articles (as shown in Figures 3 and 4, shown by the dotted lines on the outer layer of paper). Matching vent There are no particular restrictions on the placement, and one or two rows may be arranged in the circumferential direction of the smoking article. In addition, the distance between the vent holes, the size of the holes, and the method of opening the holes are not particularly limited.

<Smoking Items>

In the smoking article filter of the embodiment of the present invention, the smoking articles exemplified below can be used.

Burning smoking articles that burn tobacco fillers, for example, cigarettes with filters; non-combustion heating smoking articles that do not burn the tobacco fillers and heat; or smoke the tobacco fillers without burning or heating the tobacco fillers It is a non-heated smoking article that smells and tastes ingredients. Non-combustion heating smoking articles can include a carbon heat source type inhaler that uses the combustion heat of a carbon heat source to heat the tobacco filling material (for example, refer to WO2006/073065); a heating device equipped with an electric heating inhaler and a heating device Electric heating type inhaler (for example, refer to WO2010/110226); or liquid atomizing type inhaler (for example, refer to WO2015/046385) that atomizes the liquid aerosol source containing the aroma and taste source by heating. In addition, a non-combustion heating type smoking article that uses an aerosol-generating rod instead of a tobacco filler and heats the outside of the aerosol-generating rod to generate flavor components is also suitable. The smoking article has a battery, an electric heating part, and an aerosol generating rod member detachably inserted. The electric heating part is a heater with heating elements. The heating element of the electric heating part heats the aerosol generating rod, and the fragrance is released into the surrounding air from the filling of the aerosol generating rod. The heating temperature of the aerosol generating rod heated by the electric heating unit is, for example, 400° C. or lower. The above-mentioned smoking article having an aerosol generating rod member is specifically described in Japanese Patent No. 4889218 and Japanese Patent No. 4762247.

These non-combustion heating type smoking articles have filters that can be applied to the smoking article filters of the embodiment of the present invention.

Non-heated smoking articles can include a smoking holder and a tobacco filling material filled in the main diameter of the smoking holder, and a flavor inhaler that absorbs the aroma and taste components of the tobacco filling material (for example, refer to WO2010/095659).

The smoking article filter of the embodiment of the present invention can be suitably used among the smoking articles exemplified above.

The shape of the filter segment with porous material and the smoking article filter with the filter segment at this time can be changed appropriately.

(Example)

The present invention is further described in detail by the examples, but the present invention is not limited to the description of the following examples within the scope not exceeding the gist.

(Production example 1)

<Preparation of filter segment with porous material containing hydrotalcite particles and polyethylene resin>

The hydrotalcite particles use Mg ₆ Al ₂ (OH) ₁₆ CO ₃ . The hydrotalcite compound represented by 4H ₂ O. The product of the hydrotalcite compound is crushed and classified to prepare a particle size of 250 to 500 μm. The adhesive resin is polyethylene.

Hydrotalcite particles (75 parts by weight) and polyethylene (25 parts by weight of GUR (trademark) manufactured by Celanese), which are binder resins, were mixed and put into a mold, and heated at 200°C for 40 minutes. Take out the heated material from the mold and cool it to obtain a porous material 1 with a circumference of 23.75mm and a length of 20mm. In addition, the BET specific surface area of the hydrotalcite particles was 65 m ² /g.

(Production example 2)

The porous material 2 was obtained in the same procedure as in Production Example 1, except that cellulose particles were used instead of the hydrotalcite particles.

Cellulose particles are produced by using commercially available cellulose powder (Endurance MCCVE-090, manufactured by FMC Corporation) as raw materials, using a compression granulation device (ROLLER COMPACTOR TF-208, manufactured by FREUND Industrial Co., Ltd.), compression molding, crushing, and classification . The median diameter (D50) of the cellulose particles is 1190 μm , the bulk density is 0.832 g/cc, and the BET specific surface area is below the detection limit. The bulk density was measured with a powder tester PT-X manufactured by Hosokawa Micron Co., Ltd.

(Production example 3)

Except that unactivated carbide particles were used instead of hydrotalcite particles, the weight of which was 80 parts by weight and the weight of polyethylene was 20 parts by weight, the porous material 3 was obtained in the same procedure as in Production Example 1. The benzene adsorption energy of the unactivated carbide particles measured in accordance with JIS K 1474 is 0.6.

Unactivated carbide particles are obtained by carbonizing coconut shells in an inert gas environment in a carbonization furnace.

(Production example 4)

The porous material 4 was obtained in the same procedure as in Production Example 3, except that the hydrotalcite particles were replaced with low activated carbon produced by the steam activation method. The BET specific surface area of low activated carbon is 725m ² /g.

(Production example 5)

The porous material 5 was obtained in the same procedure as in Production Example 3 except that activated carbon produced by the steam activation method was used instead of the hydrotalcite particles. The BET specific surface area of activated carbon is 1142m ² /g.

<Test Example 1: Comparison of penetration of semi-volatile components>

Take out tobacco rods containing tobacco filaments from commercially available cigarettes with filters, and then connect the above-mentioned porous materials (20mm) and cellulose acetate tow filters ( 7mm; 5.5Y31000), and make cigarettes with filters for testing.

In addition, as a control group, a cellulose acetate tow filter (27mm; 2.8Y35000) was connected to the same tobacco rod as the above to produce a cigarette with a filter.

Use these cigarettes with filters for smoking test, choose from the crude tar content and the components in tobacco smoke As semi-volatile components, limonene, 2,5-dimethylpyrazine, 3-vinylpyridine, 3-butylpyridine, phenylethanol, and indole are analyzed.

In addition, the smoking test was conducted using the above-mentioned equipment and conditions.

The result is shown in Figure 1. The horizontal axis in Figure 1 represents the types of semi-volatile components. The vertical axis of Figure 1 represents the ratio of the amount of semivolatile components normalized by the amount of crude tar in each sample to the control group. The larger the value, the less selective reduction (more penetration).

From the results in Fig. 1, it can be seen that in the sample with the porous material using hydrotalcite particles as the filter segment, the semi-volatile component transport amount (throughput. Use. Use) was almost equal to or more than that of the control group. Cellulose particles have a significant increase in the penetration (transport volume) of semi-volatile components compared to the control group. In the sample with a porous material using low activated carbon or activated carbon as a filter segment, compared to the control The penetration (transportation volume) of semi-volatile components in the tissue is greatly reduced.

These results show that the hydrotalcite particles or cellulose particles have the ability to not selectively reduce the semi-volatile components in the crude tar of tobacco smoke.

<Test Example 2: Comparison of the adsorption capacity of formaldehyde>

(Determination of the amount of formaldehyde in mainstream cigarettes)

Determine the amount of formaldehyde in mainstream cigarettes by Canadian public law (2,4-DNPH-HPLC method), and find the formaldehyde adsorption capacity.

First, after heating and dissolving 9.51 g of 2,4-dinitrophenylhydrazine (DNPH) in 1 L of acetonitrile, 5.6 mL of 60% perchloric acid was added, and ultrapure water was added to prepare a 2 L collection solution.

The outline of the measuring device will be explained with reference to Fig. 5. As shown in Fig. 5, the DNPH trap liquid 13 is added to the trap rinse bottle 12. The volume of the rinse bottle 12 is 100 mL, and the volume of the DNPH trapping solution 13 is 80 mL. Put the rinse bottle 12 in an ice water bath 14 to cool it down. Immerse the lower end of the glass tube 15 containing the cigarette 11 The trapping liquid 13 in the rinse bottle 12. The glass tube 16 and the Cambridge pad 17 are installed in a manner of communicating with the dead volume of the washing bottle 12, and the Cambridge pad 17 is connected with the automatic smoking device 18.

A cigarette 11 is installed on the glass tube 15 to automatically smoke the cigarette 11 according to ISO standard smoking conditions. That is, to smoke each cigarette with an empty puff once, perform a 35 mL smoking action for 2 seconds, and repeat it every 58 seconds. In the bubble of mainstream smoke, formaldehyde is derivatized by DNPH. There are 2 cigarettes for the measurement. At this time, adjust the pressure loss in the same manner as the cigarette using the particles of any production example.

The derivatives produced in the above manner were determined by high-speed liquid chromatography (HPLC). After filtering the trap solution first, it was diluted with Trizma Base solution (4 mL of trap solution, 6 mL of Trizma Base solution). The liquid was measured by HPLC. The HPLC measurement conditions are as follows.

Column: HP LiChrospher 100RP-18 (5 μ )250×4mm

Protection column: HP LiChrospher 100RP-18(5 μ )4×4mm

Column temperature: 30℃

Detection wavelength: DAD356nm

Injection volume: 20 μ L

Mobile phase: 3-phase gradient (liquid A: ultrapure water solution containing 30% acetonitrile, 10% tetrahydrofuran and 1% isopropanol; liquid B: ultrapure water containing 65% acetonitrile, 1% tetrahydrofuran and 1% isopropanol Pure water aqueous solution, C liquid: acetonitrile 100%).

In addition, as a control experiment, the amount of formaldehyde in mainstream smoke was measured for cigarettes provided with a filter that does not contain any particles (hereinafter referred to as the control group). In addition, the amount of crude tar directly collected on the Cambridge pad was measured separately.

The measured amount of formaldehyde is put into the following formula to obtain the formaldehyde penetration amount normalized to the amount of crude tar.

(The amount of formaldehyde penetration standardized by the amount of crude tar)=[{(The amount of formaldehyde measured ( μ g/cig)/(the amount of crude tar) (mg/cig)]

The results are shown in Figure 2. The smaller the value of the vertical axis in Figure 2, the smaller the formaldehyde penetration per crude tar (transportation amount), which means that the particles contained in the porous material adsorb more formaldehyde.

From the results in Figure 2, when using a porous material containing hydrotalcite particles, it is the same as low activated carbon or activated carbon, which can reduce the amount of formaldehyde transported.

From the results of Test Examples 1 and 2, it can be seen that the hydrotalcite particles used in the embodiment of the present invention not only have the ability to selectively reduce the semi-volatile components in tobacco smoke than the crude tar of tobacco smoke, but also have selective The ability to reduce irritating volatile components such as formaldehyde.

<Evaluation of Functional Properties>

For the cigarettes with filters used in the test for semi-volatile component measurement, 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 a sample having a filter segment with a porous material containing hydrotalcite particles, cellulose particles, or unactivated carbide particles, the aroma and taste caused by tobacco smoke will increase and the irritation will be reduced. On the other hand, in the sample with the use of low activated carbon or activated carbon porous material as the filter segment, the irritation will be reduced, but the aroma and taste caused by the tobacco smoke will also be reduced.

From the results of the above-mentioned semi-volatile component measurement and sensory evaluation, it is possible to selectively allow semi-volatile components to penetrate (not be removed by the filter) when using the smoking article filter of the embodiment of the present invention Give the user a stronger smell and taste that the tobacco leaves have.

In addition, when the smoking article filter of the embodiment of the present invention is used, formaldehyde, which is an irritating component, can be effectively reduced.

Claims (8)

A filter for smoking articles is provided with a filter segment, and the filter segment has a porous material containing hydrotalcite particles and a non-fibrous binder resin. According to the first item of the scope of patent application, the filter for smoking articles, wherein the porous material further contains cellulose particles. According to the second item of the scope of patent application, the filter for smoking articles, wherein the weight ratio of hydrotalcite particles to cellulose particles is 10:90 to 30:70. The filter for smoking articles described in item 1 or 2 of the scope of patent application, 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 selected from the group consisting of Mg, Zn, Ni and Ca The divalent metal ion, M ³⁺ is Al ion, ^An- is selected from 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, adipic acid, succinic acid, citric acid and The n-valent anion in the group formed by sulfonic acid, 0.1<x<0.4, 0<m<2. The filter for smoking articles as described in item 1 or 2 of the scope of patent application, wherein the average particle size of the hydrotalcite particles is 200 to 800 μm . The filter for smoking articles as described in item 1 or 2 of the scope of patent application, wherein the non-fibrous binder resin is a thermoplastic resin. In the filter for smoking articles described in item 1 or 2 of the scope of the patent application, the filter segment having a porous material containing hydrotalcite particles and a non-fibrous binder resin does not contain a plasticizer. The filter for smoking articles as described in item 1 or 2 of the scope of the patent application, wherein the weight ratio of the hydrotalcite particles in the porous material to the non-fibrous binder resin is 70:30 to 80:20.

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