Filter for aerosol-generating article and aerosol-generating article comprising the same

Abstract

The present application relates to a filter for an aerosol generating article capable of effectively removing specific substances contained in mainstream smoke while maintaining excellent smoking quality, and an aerosol generating article including the same.

Description

Technical Field

[0001] The present invention relates to a filter for aerosol generating articles and an aerosol generating article including the same, the filter for aerosol generating articles being able to effectively remove specific substances contained in mainstream smoke while maintaining excellent smokeability. Background Technology

[0003] Typically, to manufacture cigarettes, various types of tobacco leaves are blended and processed to give the cigarette the desired flavor and taste. Next, the processed tobacco leaves are cut to produce shredded tobacco, and then wrapped in cigarette paper to produce a cigarette. If desired, a filter can be attached to the cigarette.

[0004] Cigarette filters can be broadly categorized into acetate filters, paper filters, and charcoal filters. Acetate filters typically contain cellulose acetate tow, with activated charcoal and plasticizers added to the filter.

[0005] On the other hand, technologies have been developed to produce various filter elements for removing specific components from the components contained in mainstream cigarette smoke.

[0007] [Existing Technical Documents]

[0008] [Patent Literature]

[0009] (Patent Document 1) Korean Patent Application Publication No. 10-2023-0056843 (Published on April 28, 2023) Summary of the Invention

[0010] Technical issues

[0011] The object of the present invention is to provide a filter for aerosol generating articles and an aerosol generating article including the same, wherein the filter for aerosol generating articles utilizes a complex containing a metal-free phthalocyanine compound to effectively remove specific substances contained in mainstream smoke while maintaining smoking properties.

[0012] However, the problems to be solved by the present invention are not limited to those described above, and those skilled in the art will clearly understand from the following description other problems not mentioned.

[0013] Technical solution

[0014] One embodiment of the present invention provides a filter section for aerosol generating articles, the filter section for aerosol generating articles comprising a complex containing a metal-free phthalocyanine compound.

[0015] Another embodiment of the present invention provides an aerosol generating article, the aerosol generating article comprising: a medium section; and a filtering unit; wherein the filtering unit includes a filtering section for the aerosol generating article.

[0016] Beneficial effects

[0017] According to one embodiment of the present invention, a filter for aerosol-generating articles can effectively remove specific substances contained in mainstream smoke while maintaining the smoking properties.

[0018] Furthermore, an aerosol generating article according to one embodiment of the present invention includes a filter section for the aerosol generating article, thereby providing smokers with excellent smoking performance and effectively removing specific substances contained in mainstream smoke.

[0019] The effects of the present invention are not limited to those described above, and those skilled in the art can clearly understand from this specification and the accompanying drawings the effects not mentioned. Attached Figure Description

[0021] Figure 1 An aerosol-generating article according to one embodiment of the present invention is shown.

[0022] Figure 2a and Figure 2b A cross-section of an aerosol-generating article according to an embodiment of the present invention is shown. Detailed Implementation

[0024] In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form.

[0025] In this specification, the terms “comprising” and / or “including” specify the presence of the mentioned shapes, steps, quantities, operations, components, elements and / or groups thereof, and do not exclude the presence or addition of one or more other shapes, steps, quantities, operations, components, elements and / or groups thereof.

[0026] In this specification, "at least one of a, b and c" may include a, b or c alone, or may include a combination of two or more selected from the group consisting of a, b and c.

[0027] In this specification, the terms "a and / or b" are used to mean "a or b" and "a and b".

[0028] In this specification, the term "connection" is a concept that means not only a direct structural connection between certain components, but also an indirect connection where another component is further inserted between them. Additionally, "connection" in this specification can also include not only structural aspects but also electrical connections between specific components and other components. For example, a connection between a first component and a second component could mean that they are structurally directly or indirectly connected, or electrically connected.

[0029] When multiple embodiments are described in this specification, each embodiment may be combined unless there is a specific description to the contrary. Here, the effects of this disclosure can be defined as including not only the effects derive from each embodiment on its own, but also the effects that occur when the various embodiments are organically combined. For example, unless the context clearly indicates otherwise, even when embodiments 1 and 2 are described independently in this specification, embodiments 1 and 2 may be organically combined with each other, and the effects of this disclosure may include the effects that occur when embodiments 1 and 2 are combined.

[0030] In this specification, the term "to" is used to indicate a range of values ​​that include the lower and upper limits of the values ​​described before and after the term, respectively. When the values ​​serving as the upper and lower limits of any range of values ​​are each disclosed as multiple numbers, the range of values ​​disclosed in this specification can be understood as any range of values ​​having any one of the multiple lower limits and any one of the multiple upper limits as the lower and upper limits, respectively. For example, when a to b or c to d is described in this specification, it is understood that greater than or equal to a and less than or equal to b, greater than or equal to a and less than or equal to d, greater than or equal to c and less than or equal to d, or greater than or equal to c and less than or equal to b are described.

[0031] In this specification, terms such as “about” or “substantially” refer to a reasonable amount of deviation of the modified term such that the final result is not significantly altered. Such terms can be interpreted as including a deviation of at least ±5% or at least ±10% within the limits that the deviation does not change the meaning of the term and does not invalidate the meaning of the term.

[0032] In this specification, "layer" or "film" can include not only cases where the layer or film is formed over the entire region when the region where the layer or film is observed, but also cases where the layer or film is formed only in a portion of the region when the region where the layer or film is observed. For example, a "layer" or "film" can be defined as including forms in which the surface of the layer or film is flat, forms in which the surface of the layer or film is uneven, and combinations thereof; or forms in which the surface of the layer or film is continuous, forms in which the surface of the layer or film is discontinuous, and combinations thereof. For example, when another component is formed directly on a component as a layer or film, the coverage of the other component relative to the surface of the component can be defined as 1% or greater, 5% or greater, 10% or greater, 20% or greater, 30% or greater, 40% or greater, 50% or greater, 60% or greater, 70% or greater, 80% or greater, 85% or greater, 90% or greater, 95% or greater, or 99% or greater. For example, even when multiple particles form a cluster structure, it can be defined as a "layer" or "film".

[0033] In this specification, when another component is placed directly on a component, it can be defined as when there are no other components between one component and the other component.

[0034] In this specification, "aerosol-generating article" can mean any smokeable product or any product that provides a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, aerosol-generating articles can include smokeable articles such as cigarettes, cigars, and cigarettes. As another example, aerosol-generating articles can be combustible smoking articles or heated smoking articles, and specifically heated smoking articles.

[0035] In this specification, "upstream" or "upstream direction" can refer to a direction away from the smoker's mouth, and "downstream" or "downstream direction" can refer to a direction closer to the smoker's mouth. The terms upstream and downstream can be used to describe the relative positions of elements forming an aerosol-generating article.

[0036] In this specification, "longitudinal direction" may refer to the direction corresponding to the longitudinal axis of the aerosol-generating article.

[0037] In this specification, the melting temperature of the compound can be measured by differential scanning calorimetry (“DSC”) as known to those skilled in the art.

[0038] In this specification, the term "metal-free phthalocyanine compound" may refer to the phthalocyanine compound itself, which does not contain any metal components.

[0040] The construction of the invention will be described in more detail below with reference to the accompanying drawings.

[0041] One embodiment of the present invention provides a filter section for aerosol generating articles, the filter section for aerosol generating articles comprising a complex containing a metal-free phthalocyanine compound.

[0042] According to one embodiment of the present invention, a filter for aerosol-generating articles can effectively remove specific substances contained in mainstream smoke while maintaining the smokeability. For example, the specific substance may be C5H5N (azirbenzene).

[0043] According to one embodiment of the present invention, the filter section for the aerosol-generating article includes the complex, thereby enabling the effective removal of specific substances contained in mainstream smoke during smoking. Specifically, the complex may include a metal-free phthalocyanine compound. The metal-free phthalocyanine compound may be free of metals or metal ions. By using a phthalocyanine compound that does not contain metal components, it is possible to effectively remove specific substances contained in mainstream smoke while preventing the transfer of metal components to the smoker during smoking.

[0044] According to one embodiment of the present invention, the composite may include: a carrier; the metal-free phthalocyanine compound; and a binder. Since the composite includes a carrier and a binder in addition to the metal-free phthalocyanine compound, the metal-free phthalocyanine compound can be stably retained in the filter section. Although there is a problem that it is not easy to apply the metal-free phthalocyanine compound to the filter section, the inventors of the present invention have developed the present invention to stably bind the metal-free phthalocyanine compound in the filter section.

[0045] According to one embodiment of the present invention, the carrier may include at least one selected from activated carbon, activated carbon fibers, zeolite, and silica gel. Specifically, the carrier may include at least activated carbon. Alternatively, the carrier may also include at least one selected from alumina, activated clay, bentonite, diatomaceous earth, metakaolin, carbon adsorbent, and porous silicate. In this case, the carbon adsorbent may include graphene. The carrier is capable of loading the metal-free phthalocyanine compounds. In addition, the carrier itself may also exhibit a filtering effect on mainstream smoke. On the other hand, when activated carbon is used as the carrier, its average diameter may be 0.1 mm or more and 1 mm or less, or 0.45 mm or more and 0.60 mm or less. When the average diameter of the activated carbon used as the carrier is within the above range, it can stably load metal-free phthalocyanine compounds, and at the same time, due to the physical properties of the activated carbon itself, it can exhibit a filtering effect.

[0046] According to one embodiment of the invention, the metal-free phthalocyanine compound can be a metal-free phthalocyanine compound. In this case, any phthalocyanine compound used in the art can be used without limitation. For example, the metal-free phthalocyanine compound may include phthalocyanine compounds represented by the following Formula 1.

[0047] [Chemical Formula 1]

[0048]

[0049] In the chemical formula 1, R a R b R c and R d Each group is independently a hydrogen atom, halogen atom, hydroxyl group, carboxyl group, nitro group, amino group, amide group, imide group, cyano group, or silyl group. Specifically, in the chemical formula 1, R a R b R c and R d Both can be hydrogen. When the complex contains R a R b R c and R d When metal-free phthalocyanine compounds represented by chemical formula 1 are composed entirely of hydrogen, they can effectively remove specific substances contained in mainstream smoke while preventing the deterioration of smoking quality.

[0050] According to one embodiment of the present invention, based on 100 parts by weight of the carrier, the content of the metal-free phthalocyanine compound in the composite can be 2 parts by weight or more and 30 parts by weight or less. Specifically, based on 100 parts by weight of the carrier, the content of the metal-free phthalocyanine compound in the composite can be 3 parts by weight or more and 28 parts by weight or less, 5 parts by weight or more and 25 parts by weight or less, 5 parts by weight or more and 20 parts by weight or less, 5 parts by weight or more and 15 parts by weight or less, 10 parts by weight or more and 25 parts by weight or less, 2 parts by weight or more and 20 parts by weight or less, 3 parts by weight or more and 18 parts by weight or less, 6 parts by weight or more and 14 parts by weight or less, 8 parts by weight or more and 12 parts by weight or less, 10 parts by weight or more and 30 parts by weight or less, 15 parts by weight or more and 30 parts by weight or less, 20 parts by weight or more and 30 parts by weight or less, or 25 parts by weight or more and 30 parts by weight or less. When the content of the metal-free phthalocyanine compound in the complex is within the above range, the filter section for the aerosol generating article is able to effectively remove specific substances contained in mainstream smoke while maintaining the smoking properties.

[0051] According to one embodiment of the present invention, the binder may include at least one of linseed oil, alkyd resins, cellulose polymers, acrylic polymers, styrene polymers, polyethylene resins, methacrylate polymers, styrene-acrylate copolymers, polystyrene, polyvinyl butyral, polyvinyl alcohol, polyethylene oxide, polypropylene carbonate, polymethyl methacrylate, ammonium acrylate, guar gum, gum arabic, gelatin, butyral resins, saturated polyester resins, natural rubber, silicone rubber, fluorosiloxanes, fluorinated elastomers, and synthetic rubber. Specifically, the binder may include linseed oil. By using a binder of the type described above, the metal-free phthalocyanine compound can be stably immobilized onto the carrier. Furthermore, when using a binder comprising linseed oil, the binder can be readily mixed with the solvents described below, thus allowing for more stable immobilization of the metal-free phthalocyanine compound onto the carrier.

[0052] According to one embodiment of the present invention, based on 100 parts by weight of the metal-free phthalocyanine compound, the content of the binder in the composite can be 0.5 parts by weight or more and 10 parts by weight or less. Specifically, based on 100 parts by weight of the metal-free phthalocyanine compound, the content of the binder in the composite can be 1 part by weight or more and 10 parts by weight, 3 parts by weight or more and 7 parts by weight, 5 parts by weight or more and 10 parts by weight, 0.5 parts by weight or more and 7 parts by weight or less, 1.5 parts by weight or more and 5.5 parts by weight or less, 3 parts by weight or more and 5 parts by weight, 5 parts by weight or more and 10 parts by weight or less, 6 parts by weight or more and 8 parts by weight or less, or 7 parts by weight or more and 10 parts by weight or less. When the content of the binder in the composite is within the above range, the metal-free phthalocyanine compound can be stably bound to the carrier. Thus, the filter section for aerosol generating articles can effectively remove specific substances contained in mainstream smoke while maintaining smoking properties.

[0053] According to one embodiment of the present invention, the complex may comprise a dried product of a complex-forming composition, the complex-forming composition comprising: the carrier; the metal-free phthalocyanine compound; the binder; and a solvent with a boiling point of 30°C or higher and 250°C or lower. That is, the complex can be prepared by drying the complex-forming composition. Specifically, a complex comprising the carrier, the metal-free phthalocyanine compound, and the binder can be prepared by drying the solvent included in the complex-forming composition.

[0054] According to one embodiment of the present invention, the composite forming composition may contain a solvent with a boiling point of 30°C or higher and 250°C or lower. Specifically, the boiling point of the solvent may be 50°C or higher and 240°C or lower, 70°C or higher and 230°C or lower, 90°C or higher and 220°C or lower, 100°C or higher and 210°C or lower, 120°C or higher and 200°C or lower, 140°C or higher and 190°C or lower, 160°C or higher and 180°C or lower, 140°C or higher and 200°C or lower, or 150°C or higher and 170°C or lower. By using a solvent having the above-mentioned boiling points, a composite comprising a metal-free phthalocyanine compound can be effectively obtained from the composite forming composition.

[0055] As the solvent, any solvent used in the art can be used without limitation, as long as it has the aforementioned boiling point. For example, the solvent may include at least one of organic solvents, mineral oils, animal oils, and vegetable oils. Specifically, the organic solvent may include at least one of aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, ether solvents, ester solvents, ketone solvents, and alcohol solvents. The aliphatic hydrocarbon solvent may include at least one of mineral spirits with a boiling point of 140°C or higher and 220°C or lower, and kerosene with a boiling point of 170°C or higher and 250°C or lower. The aromatic hydrocarbon solvent may include at least one of toluene with a boiling point of 110°C or higher and 120°C or lower, xylene with a boiling point of 137°C or higher and 142°C or lower, and naphtha with a boiling point of 110°C or higher and 160°C or lower. The ether solvent may include at least one selected from the following: ethoxyethanol with a boiling point of 128°C or higher and 157°C or lower; ethoxyethyl acetate with a boiling point of 135°C or higher and 160°C or lower; and butoxyethanol with a boiling point of 163°C or higher and 174°C or lower. The ester solvent may include at least one selected from the following: ethyl acetate with a boiling point of 74°C or higher and 77°C or lower; butyl acetate with a boiling point of 124°C or higher and 126°C or lower; methoxybutyl acetate with a boiling point of 165°C or higher and 175°C or lower; ethyl ethoxyethyl with a boiling point of 135°C or higher and 160°C or lower; and amyl acetate with a boiling point of 138°C or higher and 142°C or lower. Ketone solvents may include at least one of acetone with a boiling point of 55°C or higher and 60°C or lower, methyl ethyl ketone with a boiling point of 77°C or higher and 80°C or lower, and methyl isobutyl ketone with a boiling point of 115°C or higher and 118°C or lower. Alcohol solvents may include at least one of methanol with a boiling point of 64°C or higher and 65°C or lower, ethanol with a boiling point of 78°C or higher and 79°C or lower, isopropanol with a boiling point of 81°C or higher and 83°C or lower, butanol with a boiling point of 114°C or higher and 118°C or lower, and isobutanol with a boiling point of 104°C or higher and 107°C or lower.

[0056] Additionally, the solvent may include terebene oil, which is a vegetable oil with a boiling point of 155°C or higher and 170°C or lower. Alternatively, the solvent may include petrol, which is a mineral oil with a boiling point of 140°C or higher and 200°C or lower.

[0057] According to one embodiment of the present invention, based on 100 parts by weight of the carrier, the content of the metal-free phthalocyanine compound in the composite forming composition can be 2 parts by weight or more and 30 parts by weight or less, 3 parts by weight or more and 28 parts by weight or less, 5 parts by weight or more and 25 parts by weight or less, 5 parts by weight or more and 20 parts by weight or less, 5 parts by weight or more and 15 parts by weight or less, 10 parts by weight or more and 25 parts by weight or less, 2 parts by weight or more and 20 parts by weight or less, 3 parts by weight or more and 18 parts by weight or less, 6 parts by weight or more and 14 parts by weight or less, 8 parts by weight or more and 12 parts by weight or less, 10 parts by weight or more and 30 parts by weight or less, 15 parts by weight or more and 30 parts by weight or less, 20 parts by weight or more and 30 parts by weight or less, or 25 parts by weight or more and 30 parts by weight or less. When the content of the metal-free phthalocyanine compound contained in the composite forming composition is within the above ranges, the composite capable of effectively removing specific substances contained in mainstream smoke while maintaining smoking properties can be readily formed. In this case, the content of the carrier and the metal-free phthalocyanine compound contained in the composition for forming the complex can be the same as the content of the carrier and the metal-free phthalocyanine compound contained in the complex.

[0058] According to one embodiment of the present invention, based on 100 parts by weight of the metal-free phthalocyanine compound contained in the composite forming composition, the content of the binder can be 0.5 parts by weight or more and 10 parts by weight or less, 1 part by weight or more and 10 parts by weight or less, 3 parts by weight or more and 7 parts by weight or less, 5 parts by weight or more and 10 parts by weight or less, 0.5 parts by weight or more and 7 parts by weight or less, 1.5 parts by weight or more and 5.5 parts by weight or less, 3 parts by weight or more and 5 parts by weight or less, 5 parts by weight or more and 10 parts by weight or less, 6 parts by weight or more and 8 parts by weight or less, or 7 parts by weight or more and 10 parts by weight or less. When the content of the binder contained in the composite forming composition is within the above ranges, the composite capable of effectively removing specific substances contained in mainstream smoke while maintaining smoking properties can be readily formed. In this case, the content of the binder contained in the composite forming composition can be the same as the content of the binder contained in the composite.

[0059] According to one embodiment of the present invention, the content of the complex per unit length of the filter section can be 0.5 mg / mm or more and 5 mg / mm or less. Specifically, the content of the complex per unit length of the filter section can be 1 mg / mm or more and 4 mg / mm or less, 2 mg / mm or more and 3 mg / mm or less, 0.5 mg / mm or more and 3 mg / mm or less, 1 mg / mm or more and 2.5 mg / mm or less, 1.5 mg / mm or more and 2 mg / mm or less, 2 mg / mm or more and 5 mg / mm or less, 2 mg / mm or more and 4 mg / mm or less, or 2.5 mg / mm or more and 3.5 mg / mm or less. When the content of the complex contained in the filter section for aerosol generating articles is within the above range, a filter section capable of effectively removing specific substances contained in mainstream smoke while maintaining the smoking properties can be easily manufactured.

[0060] According to one embodiment of the present invention, the diameter of the filter section for the aerosol generating article can be 5 mm or more and 10 mm or less, 6 mm or more and 8 mm or less, or 7 mm or more and 7.5 mm or less. When the diameter of the filter section for the aerosol generating article is within the above range, specific components contained in mainstream smoke can be effectively filtered during smoking, and specific substances contained in mainstream smoke can be effectively removed. Furthermore, the length of the aerosol generating article can be 10 mm or more and 20 mm or less, 12.5 mm or more and 17.5 mm or less, 10 mm or more and 15 mm or less, or 15 mm or more and 20 mm or less. When the length of the filter section for the aerosol generating article is within the above range, specific components contained in mainstream smoke can be effectively filtered during smoking, and specific substances contained in mainstream smoke can be effectively removed.

[0061] According to one embodiment of the invention, the filter section for aerosol generating articles comprises the composite and can be formed from a variety of materials. Here, any material used in the art can be used as the material for manufacturing the filter section for aerosol generating articles, without limitation. For example, the filter section for aerosol generating articles can be a cellulose acetate filter section, a cellulose tow filter section, a paper filter section, or a polypropylene tow filter section comprising the composite.

[0062] According to one embodiment of the present invention, the removal rate of a specific substance by the filter section for aerosol generating articles can be 20% or more and 85% or less. Specifically, the removal rate of a specific substance by the filter section for aerosol generating articles can be 25% or more and 80% or less, 30% or more and 80% or less, 35% or more and 80% or less, 40% or more and 80% or less, 45% or more and 80% or less, 50% or more and 80% or less, 55% or more and 80% or less, 60% or more and 80% or less, 65% or more and 80% or less, or 70% or more and 80% or less. As described above, the filter section for aerosol generating articles comprising a complex containing metal-free phthalocyanine compounds can effectively remove specific substances contained in mainstream smoke.

[0064] Figure 1 An aerosol-generating article according to one embodiment of the present invention is shown.

[0065] One embodiment of the present invention provides an aerosol generating article, the aerosol generating article comprising: a medium section; and a filtering unit, wherein the filtering unit includes a filtering section for the aerosol generating article.

[0066] An aerosol generating article according to one embodiment of the present invention includes a filter section for the aerosol generating article, thereby providing smokers with excellent smoking performance and effectively removing specific substances contained in mainstream smoke.

[0067] Reference Figure 1 The aerosol generating article 100 may include: a filter unit 110 wrapped with filter roll paper 110a; a medium 120 wrapped with medium roll paper 120a; and a splicing paper 130.

[0068] According to one embodiment of the present invention, the medium portion may include a smoking material. For example, the smoking material may include tobacco material. The tobacco material may include tobacco leaves, tobacco stems, or materials processed therefrom. More specific examples of tobacco material include, but are not limited to, ground tobacco leaves, ground reconstituted tobacco, expanded tobacco shreds, expanded tobacco midribs, and reconstituted tobacco leaves. Additionally, the tobacco material may be in the form of tobacco shred filler, tobacco particles, tobacco sheets, tobacco beads, tobacco granules, or tobacco extracts.

[0069] According to one embodiment of the invention, the medium portion may contain other additives, such as flavoring agents, humectants, and / or acetate compounds. For example, flavoring agents may include licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, Ceylon cinnamon, cardamom, celery, fenugreek, quinoa, sandalwood, bergamot, geranium, honey extract, rose oil, vanilla, lemon oil, orange oil, peppermint oil, cinnamon, caraway, cognac, jasmine, chamomile, menthol, cinnamon, ylang-ylang, sage, spearmint, ginger, coriander, coffee, etc. Furthermore, humectants may include glycerin, propylene glycol, etc. Additionally, the medium portion may further contain vitamin components. For example, the vitamin components may include at least one of vitamin A, vitamin B, vitamin C, and vitamin E, but are not limited thereto.

[0070] According to one embodiment of the invention, the filter unit may include, in addition to the filter section for the aerosol-generating article, any structure of a filter unit used in the art, but is not limited thereto. The filter unit may be located downstream of the medium section and is the area through which the aerosol material generated in the medium section passes before being inhaled by the user. The filter unit may be formed of various materials, and for example, the filter unit may be a cellulose acetate filter section.

[0071] According to one embodiment of the invention, the filter unit may be a cellulose acetate filter section without flavoring, but is not limited thereto, and the filter unit may be a transfer jet nozzle system (TJNS) filter section flavored with flavoring. The filter unit may also be a tubular structure including a hollow portion. Alternatively, the filter unit may be manufactured by inserting a structure such as a membrane or tube made of the same or different materials into its interior (e.g., the hollow portion).

[0072] According to one embodiment of the invention, the stiffness of the filter unit can be adjusted by regulating the content of the plasticizer during the manufacture of the filter unit. Triacetin can be used as a plasticizer, but the type and content of the plasticizer are not limited thereto and can be adjusted appropriately as needed.

[0073] According to one embodiment of the present invention, the filter unit of the present invention is shown as a single filter unit consisting of a single filter section, but is not limited thereto. For example, the filter unit may of course be configured as a dual filter unit or a triple filter unit including two filter sections, etc., in order to improve filtration efficiency.

[0074] According to one embodiment of the present invention, the filtration unit may include two or more filtration sections, wherein at least one of the two or more filtration sections may include the filtration section for the aerosol generating article.

[0075] Figure 2a and Figure 2b A cross-section of an aerosol-generating article according to an embodiment of the present invention is shown. Specifically, Figure 2a A cross-section of an aerosol-generating article including a dual-filtration section with two filtration units is shown. Figure 2b A cross-section of an aerosol-generating article including a triple filtration section with three filtration sections is shown.

[0076] Reference Figure 2a The filtration unit 110 may include a first filtration section 111 and a second filtration section 112. In this case, the first filtration section 111 located on the upstream side may be the filtration section for the aerosol generating article. By setting the filtration section for the aerosol generating article as the first filtration section 111, the aerosol generating article 100 can provide smokers with excellent smoking performance and can effectively remove specific substances contained in mainstream smoke.

[0077] Reference Figure 2b The filtration unit 110 may include a first filter section 111, a second filter section 112, and a third filter section 113. In this case, at least one of the first filter section 111 and the second filter section 112 located upstream may be the filter section for the aerosol generating article. Specifically, the first filter section 111 may be the filter section for the aerosol generating article, or the second filter section 112 may be the filter section for the aerosol generating article. The filter section for the aerosol generating article is located upstream of the third filter section 113, thereby enabling the aerosol generating article 100 to provide excellent smoking performance to the smoker and effectively remove specific substances contained in mainstream smoke.

[0078] According to one embodiment of the invention, a capsule (not shown) may be included inside the filtration unit. The capsule may have a structure in which an inner solution including a fragrance is encapsulated by a coating, and for example, the capsule may have a spherical or cylindrical shape. The material forming the capsule coating may include natural materials, starch, and / or a gelling agent. For example, a coating made of natural materials may be formed using agar, pectin, sodium alginate, glycerin, etc. As a gelling agent, gellan gum or gelatin may be used. Furthermore, an auxiliary gelling agent may be used as the material forming the capsule coating. For example, calcium chloride may be used as an auxiliary gelling agent. Additionally, a plasticizer may be used as the material forming the capsule coating. Here, glycerin and / or sorbitol may be used as plasticizers. Furthermore, a coloring material may be used as the material forming the capsule coating.

[0079] As a solvent for the flavoring agent contained in the liquid filling the capsule, medium-chain fatty acid triglycerides (MCTG) can be used, for example. Additionally, the liquid may contain other additives such as pigments, emulsifiers, and thickeners. The liquid filling the capsule may include, but is not limited to, flavoring agents such as menthol or plant essential oils.

[0080] According to one embodiment of the invention, the filter unit is disposed downstream of the medium section and functions as a filter that allows aerosol substances generated in the medium section to pass through before the user inhales them. The filter unit can be wrapped with filter paper.

[0081] Alternatively, the media section can be wrapped with media roll paper. In the media roll paper, combustion promoters such as glycerin, potassium citrate (K-citrate) and / or sodium citrate (NA-citrate) used to promote the complete combustion of the smoking material through catalysis can be added. Additionally, fillers such as calcium carbonate, titanium dioxide, and magnesium oxide may also be included.

[0082] According to one embodiment of the present invention, the media roll may also have a double-roll structure. Specifically, the media roll may include an inner wrapper that contacts and wraps around the media and an outer wrapper that contacts and wraps around the inner wrapper.

[0083] Furthermore, the media roll paper can be a low-ignition-probability cigarette paper having at least one low-ignition-propensity (LIP) strip (not shown) formed thereon. The LIP strip reduces the porosity of the media roll paper, thus reducing the amount of oxygen flowing into the media when the tobacco combustion reaches the LIP strip, thereby extinguishing aerosol-generating articles during combustion. Here, the LIP strip can be a coating formed on the inner surface of the media roll paper. The filter unit wrapped with the filter roll paper and the media section wrapped with the media roll paper can be jointly wrapped by a tipping paper. That is, the tipping paper can wrap at least a portion of the media roll paper (e.g., a downstream portion) and the outer periphery of the filter roll paper. On the other hand, the tipping paper can contain a non-combustible material to prevent the filter unit from also burning along with the media section.

[0084] According to one embodiment of the present invention, the tar release of the aerosol-generating article can be 5 mg / cigarette or more and 6.5 mg / cig. or less, or 5.5 mg / cig. or more and 6.5 mg / cig. or less. Furthermore, the nicotine release of the aerosol-generating article can be 0.4 mg / cig. or more and 0.6 mg / cig. or less, 0.45 mg / cig. or more and 0.6 mg / cig. or less, or 0.5 mg / cig. or more and 0.6 mg / cig. or less. The nicotine release of the aerosol-generating article can be 5% or more and 10% or less of the tar release. The aerosol-generating article includes the aforementioned filter section for aerosol-generating articles, thereby providing excellent smoking performance to smokers while effectively removing specific substances contained in mainstream smoke.

[0086] The present invention will be described in detail below by way of embodiments. However, embodiments of the present invention can be modified in various different forms, and the scope of the invention should not be construed as limited to the embodiments described below. Embodiments are provided in this specification to explain the invention more fully to those skilled in the art.

[0088] Example

[0089] Material

[0090] Phthalocyanine was prepared as a metal-free phthalocyanine compound. Turpentine oil with a boiling point of approximately 160°C was prepared as a solvent. Activated carbon with an average diameter of approximately 0.5 mm was prepared as a carrier, and linseed oil was prepared as a binder. Here, the phthalocyanine has R in the chemical formula 1. a R b R c and R d Both have the structure of hydrogen.

[0092] Example 1

[0093] Preparation of the complex

[0094] The binder is dissolved in a solvent, and a metal-free phthalocyanine compound is added to the solvent, followed by stirring. This prepares a highly dispersed mixed solution of metal-free phthalocyanines. Subsequently, a support is added to the mixed solution, and the mixture is stirred to finally prepare a composition for complex formation.

[0095] Here, based on 100 parts by weight of the carrier, the content of the metal-free phthalocyanine compound is 3 parts by weight. Furthermore, based on 100 parts by weight of the metal-free phthalocyanine compound, the content of the binder is 3 parts by weight.

[0096] Subsequently, the prepared composite-forming composition was dried at a temperature of approximately 85°C to prepare a composite comprising a metal-free phthalocyanine compound. Here, in the prepared composite, the content of the metal-free phthalocyanine compound is 3 parts by weight based on 100 parts by weight of the carrier, and the content of the binder is 3 parts by weight based on 100 parts by weight of the metal-free phthalocyanine compound.

[0098] Manufacturing of the filter section

[0099] like Figure 2a As shown, a filter section comprising a first cellulose acetate filter section 111 and a second cellulose acetate filter section 112 containing the aforementioned complex was manufactured. Here, the diameter of the first filter section is 7.8 mm, and the length of the first filter section is 15 mm. Furthermore, the content of the complex in the first filter section is 30 mg, and the content of the complex per unit length of the first filter section is 2 mg / mm. Furthermore, the diameter of the second filter section is 7.8 mm, and the length of the second filter section is 12 mm. Aerosol-generating items like Figure 2a As shown, an aerosol generating article comprising a medium section and a filter unit including the filter section has been manufactured. The diameter of the smoking article is 7.8 mm, the length of the medium section is 57 mm, and the length of the filter unit is 27 mm. Examples 2 to 9 Except for adjusting the content of metal-free phthalocyanine compounds and binders in the composite as shown in Table 1 below, the composite, filter section and aerosol generating article were manufactured by the same method as in Example 1. [Table 1] In Table 1, the content (parts by weight) of metal-free phthalocyanine compounds is based on the content of 100 parts by weight of the carrier, and the content (parts by weight) of the binder is based on the content of 100 parts by weight of metal-free phthalocyanine compounds. Comparative Example 1 Except that a carrier (activated carbon) is used instead of the composite material in the same manner as in Example 1, the filter section and aerosol generating article are manufactured by the same method as in Example 1. Comparative Examples 2 to 4 Except for adjusting the content of metal-free phthalocyanine compounds and binders in the composite as shown in Table 2 below, the composite, filter section and aerosol generating article were manufactured by the same method as in Example 1. Reference Example 1 Except for adjusting the content of the metal-free phthalocyanine compounds and binders contained in the composite as shown in Table 2 below, the composite, filter section and aerosol generating article are manufactured in the same manner as in Example 1. [Table 2] In Table 2, the content (parts by weight) of metal-free phthalocyanine compounds is based on the content of 100 parts by weight of the carrier, and the content (parts by weight) of the binder is based on the content of 100 parts by weight of metal-free phthalocyanine compounds. Analysis of smoke emission The smoke composition of the aerosol-generating articles manufactured in the embodiments, comparative examples and reference examples was measured, and the results are shown in Table 3 below. [Table 3] In Table 3, the C5H5N removal rate was calculated by comparing the C5H5N content measured in Examples 1 to 9, Comparative Examples 2 to 4 and Reference Example 1 with the C5H5N content measured in Comparative Example 1. Referring to Table 3, it was confirmed that the aerosol-generating articles including the filter sections of Examples 1 to 9 of the present invention effectively remove C5H5N contained in mainstream smoke while providing excellent smokeability. On the other hand, it was confirmed that the filter sections of Comparative Examples 1 to 4 had very poor ability to remove C5H5N contained in mainstream smoke. In addition, it was confirmed that, in the case of Reference Example 1, the C5H5N removal rate was not high compared to Example 5, and the N / T performance was poor. [Explanation of reference numerals in the attached figures] 100: Aerosol generating items 110: Filter unit 110a: Filter section paper roll 111: First filtration section; 112: Second filtration section 113: Third Filtration Section 120: Medium section 120a: Tobacco-based paper rolls; 130: Tipping paper.

Claims

1. A filter section for aerosol-generating articles, comprising a complex containing a metal-free phthalocyanine compound.

2. The filter unit for aerosol-generating articles according to claim 1, wherein, The complex comprises: a carrier; the metal-free phthalocyanine compound; and a binder.

3. The filter unit for aerosol-generating articles according to claim 2, wherein, Based on 100 parts by weight of the carrier, the content of the metal-free phthalocyanine compound in the composite is more than 2 parts by weight and less than 30 parts by weight.

4. The filter unit for aerosol-generating articles according to claim 2, wherein, Based on 100 parts by weight of the metal-free phthalocyanine compound, the content of the binder in the complex is 0.5 parts by weight or more and 10 parts by weight or less.

5. The filter unit for aerosol-generating articles according to claim 2, wherein, The carrier includes at least one of activated carbon, activated carbon fiber, zeolite, and silica gel.

6. The filter unit for aerosol-generating articles according to claim 2, wherein, The binder includes at least one of linseed oil, alkyd resins, cellulose polymers, acrylic polymers, styrene polymers, polyethylene resins, methacrylate polymers, styrene-acrylate copolymers, polystyrene, polyvinyl butyral, polyvinyl alcohol, polyethylene oxide, polypropylene carbonate, polymethyl methacrylate, ammonium acrylate, guar gum, gum arabic, gelatin, butyral resins, saturated polyester resins, natural rubber, silicone rubber, fluorosiloxanes, fluorinated elastomers, and synthetic rubber.

7. The filter unit for aerosol-generating articles according to claim 2, wherein, The complex comprises a dried product of a complex-forming composition comprising: the carrier; the metal-free phthalocyanine compound; the binder; and a solvent having a boiling point of 30°C or higher and 250°C or lower.

8. The filter unit for aerosol-generating articles according to claim 1, wherein, The content of the complex per unit length of the filter section is 0.5 mg / mm or more and 5 mg / mm or less.

9. An aerosol-generating article, comprising: Medium section; as well as Filter unit, The filtration unit includes a filtration section for aerosol-generating articles according to claim 1.

10. The aerosol-generating article according to claim 9, in, The filtration unit includes two or more filtration sections, and Wherein, at least one of the two or more filter sections includes the filter section for the aerosol generating article.

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