Activated carbon, filter for smoking article, and smoking article comprising same

Abstract

Disclosed is activated carbon having excellent ability to remove vapor-phase components. According to an aspect, provided is activated carbon including micropores having a pore diameter of less than 2 nm, wherein a ratio of the micropores is 70-80 vol% based on the total pore volume of the activated carbon, and the activated carbon has a BET specific surface area greater than or equal to 2,000 m2 / g.

Description

Activated carbon, filter for smoking articles, and smoking articles including the same

[0001] The present disclosure relates to activated carbon, and more specifically to activated carbon, a filter for smoking articles, and a smoking article comprising the same.

[0002] Activated carbon is generally widely used to remove vapor phase components, and it is also used in cigarette filters to reduce vapor phase components in cigarette smoke.

[0003] Recently, filter manufacturers and tobacco companies have been conducting research to reduce vapor phase components, such as aldehydes, in cigarette smoke.

[0004] [Prior Art Literature]

[0005] [Patent Literature]

[0006] (Patent Document 1) Korean Registered Patent Publication No. 10-0669490 (Published Jan. 16, 2007)

[0007] According to one aspect of the present invention, an activated carbon having excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) is provided.

[0008] According to another aspect of the present invention, an activated carbon is provided that lowers the smoky intensity and irritancy of a smoking article.

[0009] According to another aspect of the present invention, a method for manufacturing the activated carbon is provided.

[0010] According to another aspect of the present invention, a filter for a smoking article comprising the activated carbon is provided.

[0011] According to another aspect of the present invention, a smoking article comprising a filter for the smoking article is provided.

[0012] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof described in the specification.

[0013] According to a first aspect of the present invention, an activated carbon comprising micropores having a pore diameter of less than 2 nm, wherein the ratio of the micropores based on the total pore volume of the activated carbon is 70 to 80 vol%, and the BET specific surface area of ​​the activated carbon is 2,000 m² 2 Activated carbon with a content of / g or more is provided.

[0014] According to a second aspect of the present invention, in the first aspect, the volume of the micropore is 0.8 to 1.1 cm³ 3 It can be / g.

[0015] According to a third aspect of the present invention, the activated carbon in the first or second aspect further comprises mesopores having a pore diameter of 2 nm or more and 50 nm or less, and the ratio of the mesopores based on the total pore volume of the activated carbon may be 15 to 25 vol%.

[0016] According to the fourth aspect of the present invention, in the third aspect, the volume of the mesopore is 0.2 to 0.4 cm² 3 It can be / g.

[0017] According to the fifth aspect of the present invention, in any one of the first to fourth aspects, the activated carbon further comprises macropores having a pore diameter greater than 50 nm, and the ratio of the macropores to the total pore volume of the activated carbon may be 1 to 5 vol%.

[0018] According to the sixth aspect of the present invention, in the fifth aspect, the volume of the macropore is 0.01 to 0.10 cm³ 3 It can be / g.

[0019] According to the seventh aspect of the present invention, in any one of the first to sixth aspects, the BET specific surface area of ​​the activated carbon is 2,200 m² 2 It can be more than / g.

[0020] According to the eighth aspect of the present invention, in any one of the first to seventh aspects, the total pore volume of the activated carbon is 1.0 cm 3 It can be more than / g.

[0021] According to the ninth aspect of the present invention, a filter for a smoking article comprising activated carbon according to any one of the first to eighth aspects is provided.

[0022] According to the 10th aspect of the present invention, a smoking article is provided, comprising: a filter portion; and a medium portion disposed on one side of the filter portion, wherein the filter portion comprises a filter for a smoking article according to the 9th aspect.

[0023] According to the 11th aspect of the present invention, in the 10th aspect, the filter portion comprises a first portion and a second portion different from the first portion, the second portion is closer to the medium portion than the first portion, and the second portion may include a filter for the smoking article.

[0024] The means for solving the above problem are not all of the features of the present invention and may be combined with some embodiments of this specification. Various features of the present invention and the advantages and effects derived therefrom may be understood in more detail by referring to the specific description below.

[0025] According to one aspect of the present invention, it is possible to realize an activated carbon that has excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously reducing the inhalation intensity and irritation of smoking products.

[0026] In addition to the effects described above, specific effects of the present invention are described together with the following explanation of specific details for implementing the invention. Furthermore, the effects of the present invention are not limited to those mentioned above and can be easily realized by means and combinations thereof described in the specification.

[0027] FIG. 1 shows a smoking article according to one embodiment of the present invention.

[0028] FIG. 2 shows a smoking article according to another embodiment of the present invention.

[0029] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0030] In this specification, the terms “comprise” and / or “comprising” specify the presence of the mentioned features, steps, numbers, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, steps, numbers, actions, parts, elements, and / or groups thereof.

[0031] In this specification, "at least one of a, b and c" may include a, b, or c alone, or two or more combinations selected from the group consisting of a, b, and c.

[0032] As used in this specification, the term "connection" refers not only to the direct connection of certain members but also includes the concept of indirect connection through the interposition of other members between them.

[0033] Where various embodiments are described in this specification, each embodiment may be combined unless specifically stated otherwise. In this case, the effects of the present invention may be defined as including effects derived from each embodiment and effects resulting from the organic combination of each embodiment. For example, even if embodiments 1 and 2 are described independently in this specification, unless the context clearly indicates otherwise, embodiments 1 and 2 may be organically combined with each other, and the effects of the present invention may include effects resulting from the combination of embodiments 1 and 2.

[0034] In this specification, a range of numerical values ​​indicated by the term 'to' represents a range of numerical values ​​that includes the values ​​listed before and after the term as the lower and upper limits, respectively. If multiple numerical values ​​are disclosed as the upper and lower limits of an arbitrary numerical range, the range of numerical values ​​disclosed in this specification may be understood as a range of arbitrary numerical values ​​in which any one of the multiple lower limits and any one of the multiple upper limits are respectively the lower limit and upper limit. For example, if the specification states a to b or c to d, it may be understood as stating a to b, a to d, c to d, or c to b.

[0035] In this specification, “pore diameter” may be defined as meaning the average diameter of the pores.

[0036] According to one aspect of the present invention, an activated carbon comprising micropores having a pore diameter of less than 2 nm, wherein the ratio of the micropores based on the total pore volume of the activated carbon is 70 to 80 vol%, and the BET specific surface area of ​​the activated carbon is 2,000 m² 2Activated carbon with a value of 1 / g or more is provided. According to one aspect of the present invention, by controlling the ratio of micropores and the BET specific surface area of ​​the activated carbon to within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that reduces the inhalation intensity and irritation of smoking articles.

[0037] The configuration of the present invention will be described in more detail below.

[0038] 1. Activated carbon

[0039] Micropores

[0040] In this specification, the diameter of the micropore is defined as being less than 2 nm, specifically greater than 0 nm and less than 2 nm.

[0041] The activated carbon according to the present invention includes micropores configured to effectively adsorb vapor phase components. Specifically, as the micropores are included in the activated carbon, vapor phase components are effectively bound to the pore tissue within the activated carbon, thereby effectively removing vapor phase components generated during smoking.

[0042] In some embodiments of the present invention, the diameter of the micropores may be greater than 0 nm and less than 2 nm, 0.1 to 2 nm, 0.2 to 2 nm, 0.3 to 2 nm, 0.4 to 2 nm, or 0.5 to 2 nm. According to some embodiments of the present invention, by controlling the diameter of the micropores to within the above numerical range, the pore size is increased to an appropriate level relative to the molecular size of the vapor phase component, so that the vapor phase component can be strongly bound to the pore tissue. For example, the diameter of the micropores may be measured based on Density Functional Theory (DFT).

[0043] Meanwhile, the micropore ratio refers to the ratio of the volume of micropores to the total pore volume of the activated carbon.

[0044] In some embodiments of the present invention, the ratio of the micropores based on the total pore volume of the activated carbon is 70 to 80 vol%, and specifically, may be 71 to 79 vol%, 72 to 78 vol%, 73 to 77 vol%, 74 to 76 vol%, 75 to 76 vol%, or 75.9 to 76 vol%. According to some embodiments of the present invention, by controlling the ratio of the micropores to within the above numerical range, the vapor phase components are strongly bound to the pore tissue, and the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved.

[0045] In some embodiments of the present invention, when (i) the diameter of the micropores satisfies greater than 0 nm and less than 2 nm, 0.1 to 2 nm, 0.2 to 2 nm, 0.3 to 2 nm, 0.4 to 2 nm, or 0.5 to 2 nm, and (ii) the ratio of the micropores to the total pore volume of the activated carbon satisfies 70 to 80 vol%, 71 to 79 vol%, 72 to 78 vol%, 73 to 77 vol%, 74 to 76 vol%, 75 to 76 vol%, or 75.9 to 76 vol%, the vapor phase components are strongly bound to the pore tissue, and the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved.

[0046] In some embodiments of the present invention, the volume of the micropores is 0.8 to 1.1 cm³ 3 / g, 0.85 to 1.1 cm 3 / g, 0.9 to 1.0 cm 3 / g, or 0.97 to 1.0 cm3 It may be / g. According to some embodiments of the present invention, by controlling the volume of the micropores to within the above numerical range, the vapor phase components are strongly bound to the pore tissue, thereby further improving the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs). For example, the volume of the micropores may be measured using nitrogen adsorption, the mercury porosimetry technique, the Horvath-Kawazoe (HK) method, or Density Functional Theory (DFT).

[0047] Mesogi Gong

[0048] In this specification, "Mesopore" is defined as a pore having a diameter of 2 nm or more and 50 nm or less.

[0049] The activated carbon according to the present invention may further include mesopores, which are one of the factors affecting the BET specific surface area of ​​the activated carbon. Specifically, the BET specific surface area of ​​the activated carbon may change by controlling the volume of the mesopores and the ratio of mesopores to the total pore volume, and accordingly, the performance of adsorbing vapor phase components may also change.

[0050] Meanwhile, the mesopore ratio refers to the ratio of the volume of mesopores to the total pore volume of the activated carbon. For example, the volume of each pore can be measured using nitrogen adsorption, the Mercury porosimetry technique, the Horvath-Kawazoe (HK) method, or Density Functional Theory (DFT).

[0051] In some embodiments of the present invention, the ratio of the mesopores based on the total pore volume of the activated carbon may be 15 to 25 vol%, 16 to 24 vol%, 17 to 23 vol%, 18 to 22 vol%, 19 to 21 vol%, or 20.5 to 21 vol%. According to some embodiments of the present invention, by controlling the ratio of the mesopores to within the above numerical range, the BET specific surface area of ​​the activated carbon can be increased to an appropriate level, and accordingly, the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved.

[0052] In some embodiments of the present invention, the volume of the mesopore is 0.2 to 0.4 cm³ 3 / g, 0.21 to 0.39 cm 3 / g, 0.22 to 0.38 cm 3 / g, 0.23 to 0.37 cm 3 / g, 0.24 to 0.30 cm 3 / g, 0.25 to 0.29 cm 3 / g, or 0.26 to 0.28 cm 3 It may be / g. According to some embodiments of the present invention, by controlling the volume of the mesopores to within the above numerical range, the BET specific surface area of ​​the activated carbon can be increased to an appropriate level, and accordingly, the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved. For example, the volume of the mesopores can be measured using nitrogen adsorption, the mercury porosimetry technique, the Horvath-Kawazoe (HK) method, or Density Functional Theory (DFT).

[0053] Macro Engineering

[0054] In this specification, "macropore" is defined as a pore having a diameter greater than 50 nm. For example, the upper limit for the diameter of the pores included in the macropore may be 100 nm or less, 150 nm or less, or 200 nm or less.

[0055] The activated carbon according to the present invention may further include macropores, which are one of the factors affecting the BET specific surface area of ​​the activated carbon. Specifically, the BET specific surface area of ​​the activated carbon may change by controlling the volume of the macropores and the ratio of macropores to the total pore volume, and accordingly, the performance of adsorbing vapor phase components may also change.

[0056] Meanwhile, the macropore ratio refers to the ratio of the volume of macropores to the total pore volume of the activated carbon. For example, the volume of each pore can be measured using nitrogen adsorption, the Mercury porosimetry technique, the Horvath-Kawazoe (HK) method, or Density Functional Theory (DFT).

[0057] In some embodiments of the present invention, the ratio of the macropores based on the total pore volume of the activated carbon may be 1 to 5 vol%, 2 to 4 vol%, 3 to 4 vol%, or 3.6 to 4 vol%. According to some embodiments of the present invention, by controlling the ratio of the macropores to within the above numerical range, the BET specific surface area of ​​the activated carbon can be increased to an appropriate level, and accordingly, the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved.

[0058] In some embodiments of the present invention, the volume of the macropores is 0.01 to 0.10 cm³3 / g, 0.02 to 0.09 cm 3 / g, 0.03 to 0.08 cm 3 / g, 0.04 to 0.07 cm 3 / g, or 0.05 to 0.06 cm 3 It may be / g. According to some embodiments of the present invention, the volume of the macropores is controlled within the above numerical range, thereby increasing the BET specific surface area of ​​the activated carbon to an appropriate level, and accordingly, the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs) can be further improved.

[0059] Relationships between components

[0060] In some embodiments of the present invention, the total sum of the volume of the macropores and the volume of the mesopores is 0.21 to 0.50 cm² 3 / g, 0.22 to 0.45 cm 3 / g, 0.23 to 0.40 cm 3 / g, 0.25 to 0.38 cm 3 / g, 0.26 to 0.37 cm 3 / g, 0.27 to 0.36 cm 3 / g, 0.28 to 0.35 cm 3 / g, 0.29 to 0.34 cm 3 / g, 0.30 to 0.33 cm 3 / g, or 0.31 to 0.33 cm 3 It may be / g. According to some embodiments of the present invention, by controlling the total sum of the volume of the macropores and the volume of the mesopores to be within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that lowers the inhalation intensity and irritation of smoking articles.

[0061] Physical properties

[0062] The BET (Brunauer, Emmett, Teller) specific surface area of ​​the activated carbon according to the present invention may be a factor affecting the removal capacity of vapor phase components of the activated carbon. Specifically, the BET specific surface area may be a physical property derived from a combination of the ratio of micropores, the ratio of mesopores, and the ratio of macropores. Therefore, if at least one of the combinations of the ratio of micropores, the ratio of mesopores, and the ratio of macropores does not satisfy the above numerical range, the BET specific surface area may not be achieved.

[0063] The BET specific surface area of ​​the activated carbon according to the present invention is 2,000 m² 2 / g or more, specifically 2,200 m 2 It may be greater than / g, and more specifically 2,200 to 2,500 m 2 / g, 2,200 to 2,400 m 2 / g, or 2,200 to 2,300 m 2 / g. According to some embodiments of the present invention, by controlling the BET specific surface area of ​​the activated carbon to within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that lowers the inhalation intensity and irritation of smoking articles.

[0064] In some embodiments of the present invention, the total pore volume of the activated carbon is 1.0 cm 3 / g or more, 1.1 cm 3 / g or more, or 1.2 cm 3 It may be greater than / g, specifically 1.2 to 1.5 cm 3 / g, 1.2 to 1.4 cm 3 / g, 1.2 to 1.3 cm 3 / g, or 1.27 to 1.3 cm3 It may be / g. According to some embodiments of the present invention, by controlling the total pore volume of the activated carbon to within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that lowers the inhalation intensity and irritation of smoking articles.

[0065] In this specification, the average particle size of a particle is the particle size (D) at which the cumulative percentage in the volume-based particle size distribution curve reaches 50% when measured by a laser diffraction particle size distribution measuring device. 50 It can be defined as ). For example, the average particle size of the above particles can be calculated by dispersing the particles to be measured in a dispersion medium, introducing them into a commercially available laser diffraction particle size measuring device (e.g., Microtrac S3500), and measuring the difference in diffraction patterns according to particle size as the particles pass through a laser beam.

[0066] In some embodiments of the present invention, the average particle size (D) of the activated carbon is 50 The particle size may be 0.18 mm or more, 0.20 mm or more, 0.30 mm or more, 0.40 mm or more, or 0.50 mm or more; 0.60 mm or less, 0.50 mm or less, 0.40 mm or less, 0.30 mm or less, or 0.20 mm or less; or any one or more of the plurality of lower limits and any one or less of the plurality of upper limits. According to some embodiments of the present invention, the average particle size of the activated carbon is controlled to be within the numerical range so that it is uniformly distributed on the surface or inside of the filter element, thereby further improving the removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs).

[0067] In some embodiments of the present invention, in accordance with KS M 1802-a, the iodine adsorption capacity of the activated carbon may be 1,840 mg / g or more, 1,850 mg / g or more, or 1,853 mg / g or more. According to some embodiments of the present invention, by controlling the iodine adsorption capacity of the activated carbon to be within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that reduces the inhalation intensity and irritation of smoking articles.

[0068] Manufacturing method

[0069] According to another aspect of the present invention, a method for manufacturing the activated carbon can be provided.

[0070] A method for manufacturing activated carbon according to the present invention may include: (S1) a step of carbonizing a coconut shell; (S2) a step of first activating the carbonized coconut shell to produce a porous structure; (S3) a step of crushing the porous structure to produce a preliminary activated carbon; and (S4) a step of secondarily activating the preliminary activated carbon.

[0071] Specifically, by carbonizing the coconut shell in step (S1), hydrocarbons and volatile matter contained in the coconut shell can be removed. In some examples, step (S1) may include heating at 500 to 550°C for about 3 to 5 days or 4 days, and then cooling at about 15 to 25°C for 10 to 14 hours.

[0072] Specifically, the above step (S2) may be a step of manufacturing a porous structure by activating the carbonized coconut shell. By manufacturing the porous structure, vapor phase components including carbonyls and volatile organic compounds can be effectively adsorbed into the pore tissue contained in the porous structure.

[0073] In some examples, the above step (S2) may include the step of putting the carbonized coconut shell and liquid water, which is the first activator, into a reactor and then performing primary activation at 700 to 900 ℃ for 1 to 3 hours.

[0074] In some examples, the content of the first activator may be 90 to 110 parts by weight, 95 to 105 parts by weight, 97 to 103 parts by weight, 98 to 102 parts by weight, or 99 to 100 parts by weight with respect to 100 parts by weight of the carbonized coconut shell. Specifically, by adjusting the content of the first activator to within the above numerical range, the BET specific surface area of ​​the activated carbon can be further increased, thereby further improving the effect of removing vapor phase components.

[0075] In some examples, the first activator may be liquid water, water vapor, or carbon dioxide, and specifically, may be liquid water. Specifically, by using liquid water as the first activator, the BET specific surface area of ​​the activated carbon can be further increased, thereby further improving the effect of removing vapor phase components.

[0076] Specifically, the above step (S3) may be a step of crushing the porous structure to increase the BET specific surface area of ​​the activated carbon and further increase the adsorption performance for vapor phase components. For example, when crushing the porous structure, the size of the pre-activated carbon may be adjusted to 30 x 80 mesh.

[0077] Specifically, the above step (S4) can further increase the BET specific surface area of ​​the activated carbon and increase the ratio of micropores to an appropriate level by secondarily activating the above pre-activated carbon.

[0078] In some embodiments of the present invention, step (S4) may include the step of placing the pre-activated carbon and the second activator into a reactor and then performing secondary activation at 900 to 1000°C for 4 to 7 hours. Specifically, the activation temperature of step (S4) may be 910 to 990°C, 920 to 980°C, 930 to 970°C, 940 to 960°C, or 950 to 955°C, and the activation time may be 5 to 7 hours, or 5 to 6 hours. According to some embodiments of the present invention, by controlling the activation temperature and activation time of step (S4) within the above numerical ranges, the BET specific surface area of ​​the activated carbon can be further increased and the ratio of micropores can be increased to an appropriate level. Accordingly, it is possible to realize activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing activated carbon that reduces the intensity of the smoking taste and irritation of smoking products.

[0079] In some embodiments of the present invention, the second activator may be liquid water, water vapor, or carbon dioxide, and specifically, may be liquid water. Specifically, by using liquid water as the second activator, the BET specific surface area of ​​the activated carbon can be further increased, thereby further improving the effect of removing vapor phase components.

[0080] In some embodiments of the present invention, the content of the second activator may be 105 to 115 parts by weight, 107 to 113 parts by weight, 109 to 111 parts by weight, or 110 to 111 parts by weight with respect to 100 parts by weight of the pre-activated carbon. According to some embodiments of the present invention, by controlling the content of the second activator to within the above numerical range, it is possible to realize an activated carbon with excellent removal ability for vapor phase components including carbonyls and volatile organic compounds (VOCs), while simultaneously realizing an activated carbon that reduces the inhalation intensity and irritancy of smoking articles.

[0081] For example, the BET specific surface area of ​​the activated carbon may vary by independently controlling factors such as (i) the presence or absence of a secondary activation step, (ii) the activation temperature of the secondary activation step, (iii) the activation time of the secondary activation step, (iv) the type of secondary activator, (v) the content of the secondary activator, and (vi) the process conditions (temperature and time) of the primary activation step in the method for manufacturing the activated carbon.

[0082] For example, the ratio of micropores based on the total pore volume of the activated carbon can be varied by independently controlling factors such as (i) the presence or absence of a secondary activation step, (ii) the activation temperature of the secondary activation step, (iii) the activation time of the secondary activation step, (iv) the type of secondary activator, (v) the content of the secondary activator, and (vi) the process conditions (temperature and time) of the primary activation step in the method for manufacturing the activated carbon.

[0083] If at least one of the factors (i) to (vi) above falls outside the appropriate range, the BET specific surface area of ​​the activated carbon and the ratio of the micropores may not be realized.

[0084] 2. Filters for smoking products

[0085] In this specification, the term "smoking article" may mean any product capable of smoking or any product capable of providing a smoking experience, regardless of whether it is based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, a smoking article may include products capable of smoking, such as cigarettes, cigars, and cigarillos. As another example, a smoking article may include a combustion smoking article or a heated smoking article.

[0086] According to another aspect of the present invention, a filter for a smoking article comprising activated carbon of some embodiments is provided.

[0087] The filter for a smoking product according to the present invention can perform a filtration function for smoke and / or aerosols generated in the medium portion to be described later.

[0088] In some examples, the filter for the smoking article may further include at least one filter element specifically selected from cellulose acetate and a paper sheet, although not specifically limited thereto.

[0089] In some embodiments of the present invention, the activated carbon may be filled on the surface or inside the filter element. Specifically, the activated carbon may be placed between the fibers forming the filter element or placed in a state of being evenly distributed on the fibers.

[0090] In some examples, the total length of the filter for the smoking article in the longitudinal direction may be 12 to 18 mm, or 12 to 15 mm.

[0091] In some examples, the content of the activated carbon is not specifically limited, but specifically, it may be 13 to 24 mg based on the total length of the filter for the smoking article.

[0092] 3. Smoking products

[0093] In this specification, "Upstream" or "upstream direction" may mean a direction away from the smoker's bulb, and "Downstream" or "downstream direction" may mean a direction closer to the smoker's bulb. The terms upstream and downstream may be used to describe the relative positions of elements constituting a smoking article.

[0094] In this specification, "longitudinal direction" may mean a direction corresponding to the longitudinal axis of the smoking article.

[0095] According to another aspect of the present invention, a smoking article is provided, comprising a filter portion and a medium portion disposed on one side of the filter portion, wherein the filter portion comprises a filter for a smoking article of some embodiment.

[0096] The configuration of the present invention will be described in more detail below with reference to FIGS. 1 and 2.

[0097] FIG. 1 shows a smoking article according to one embodiment of the present invention.

[0098] Referring to FIG. 1, the smoking article (100) according to the present invention includes a filter portion (10) and a medium portion (20). Specifically, the filter portion (10) and the medium portion (20) may be arranged continuously along the longitudinal direction, and more specifically, the medium portion (20) may be located upstream and the filter portion (10) may be located downstream.

[0099] The filter unit (10) according to the present invention can filter smoke and / or aerosol generated in the medium unit (20). Specifically, the filter unit (10) may include a filter for a smoking article comprising activated carbon of some embodiments.

[0100] A medium section (20) according to the present invention is disposed on one side of the filter section (10). Specifically, the medium section (20) may include a medium that generates smoke and / or aerosol as it burns.

[0101] In this specification, the term "medium" is not particularly limited and may be any material commonly used in the art that can generate smoke and / or aerosol. Specifically, the medium may include tobacco raw materials such as tobacco leaf pieces, tobacco stems, etc., and materials processed therefrom. As a more specific example, the medium may include crushed tobacco leaves, puffed main veins, tobacco cut leaves (e.g., leaf tobacco cut leaves, plate leaf cut leaves), tobacco sheets (e.g., plate leaves), etc.

[0102] In some examples, the medium may further include one or more additives among humectants and flavoring agents. For example, the humectant can maintain the moisture in the medium at an appropriate level to soften the characteristic taste and increase the vapor production. Specifically, the humectant may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. For example, the flavoring agent may be added to enhance the flavor. Specifically, the above flavoring agent may include licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, cinnamon, cardamom, celery, fenugreek, cascarilla, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, mint oil, caraway, cognac, jasmine, chamomile, menthol, ylang-ylang, sage, spearmint, ginger, coriander, clove extract (or clove substance), or coffee, etc.

[0103] FIG. 2 shows a smoking article according to another embodiment of the present invention.

[0104] Referring to FIG. 2, in a smoking article (100) according to another embodiment of the present invention, the filter portion (10) may include a first portion (10a) and a second portion (10b) that is different from the first portion (10a). Specifically, the second portion (10b) may be closer to the medium portion (20) than the first portion (10a).

[0105] In some embodiments of the present invention, the second part (10b) may include a filter for a smoking article of some embodiments. According to some embodiments of the present invention, by including a filter for a smoking article in the second part (10b), vapor-phase components can be effectively removed before external air introduced through the perforation enters the interior of the smoking article, thereby enabling the implementation of a smoking article with low smoking intensity and irritation.

[0106] In some embodiments of the present invention, the first portion (10a) may not include the activated carbon described above. According to some embodiments of the present invention, by not including the activated carbon in the first portion (10a), vapor-phase components can be effectively removed before external air introduced through the perforation enters the interior of the smoking article.

[0107] In some embodiments of the present invention, the content of carbonyl vapor phase components produced under the smoking conditions of ISO 21160 may be 30 μg / cig or less, 28 μg / cig or less, 20 μg / cig or less, 10 μg / cig or less, 5 μg / cig or less, 1.8 μg / cig or less, 1.7 μg / cig or less, or 1.66 μg / cig or less. For example, the carbonyl vapor phase components may include or consist of formaldehyde, acetaldehyde, acetone, acrolein, propionaldehyde, crotonaldehyde, methyl ethyl ketone, and butyraldehyde. Specifically, if the length of the filter portion is 28 mm or more, 29 mm or more, or 30 mm or more, and the circumference of the filter portion is 23 mm or less, 22 mm or less, 21 mm or less, or 20 mm or less, the effect of reducing vapor phase components including carbonyls can be further improved.

[0108] In some embodiments of the present invention, the content of volatile organic compounds produced under the smoking conditions of ISO 21330 may be 15 μg / cig or less, 14 μg / cig or less, 13 μg / cig or less, 12 μg / cig or less, 11 μg / cig or less, 10 μg / cig or less, 9 μg / cig or less, 8 μg / cig or less, 7 μg / cig or less, 6 μg / cig or less, 5 μg / cig or less, or 4.8 μg / cig or less. For example, the volatile organic compounds may include or consist of 1,3-butadiene, isoprene, acrylonitrile, benzene, and toluene. Specifically, if the length of the filter section is 28 mm or more, 29 mm or more, or 30 mm or more, and the circumference of the filter section is 23 mm or less, 22 mm or less, 21 mm or less, or 20 mm or less, the effect of reducing the vapor phase components of volatile organic compounds can be further improved.

[0109] Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the present invention; however, this is merely an example, and the scope of the present invention is not limited by the following.

[0110] In this specification, terms such as “about” or “substantially” mean a reasonable amount of variation of a term modified so as not to significantly alter the final result. Such terms may be interpreted to include a deviation of at least ±5% or at least ±10% relative to the stated value, to the extent that the deviation does not alter or invalidate the meaning of the word.

[0111] [Preparation Example 1: Preparation of Activated Carbon]

[0112] <Comparative Example 1: Preparation of General Activated Carbon>

[0113] Step of carbonizing coconut shells:

[0114] Coconut shells were heated to approximately 500°C for about 4 days and then cooled at room temperature for about 12 hours to produce carbonized coconut shells. Through this process, hydrocarbons and volatile matter contained in the coconut shells were removed.

[0115] Step for primary activation of carbonized coconut shells:

[0116] After placing the carbonized coconut shell into a reactor, a porous structure was prepared by primary activation using water (liquid phase), which is an activator, at approximately 830°C for approximately 2 hours. At this time, the water content was adjusted to approximately 100 parts by weight per approximately 100 parts by weight of the carbonized coconut shell.

[0117] Grinding step:

[0118] The above porous structure was crushed with a grinder to produce general activated carbon with a mesh size of approximately 30 x 80.

[0119] <Comparative Example 2: Preparation of Super Activated Carbon>

[0120] After placing the general activated carbon of Comparative Example 1 into a reactor, super activated carbon was produced by secondary activation using water (liquid phase) at approximately 870°C for approximately 4 hours. At this time, the water content was adjusted to approximately 95 parts by weight per 100 parts by weight of the general activated carbon.

[0121] <Example 1: Preparation of Ultra Activated Carbon>

[0122] After placing the general activated carbon of Comparative Example 1 into a reactor, ultra-activated carbon was produced by secondary activation using water (liquid phase) at approximately 950°C for approximately 6 hours. At this time, the water content was adjusted to approximately 110 parts by weight per 100 parts by weight of the general activated carbon.

[0123] [Experimental Example 1: Measurement of Physical Properties of Activated Carbon]

[0124] The physical properties of the activated carbon prepared according to the methods of Comparative Examples 1 and 2 and Example 1 above were measured by the following method.

[0125] BET Specific Surface Area, Measurement Method of Each Pore Volume:

[0126] The specific surface area, the ratio of each pore, and the volume per unit mass of each pore of activated carbon samples (0.2 g) prepared by the methods according to Comparative Examples 1 and 2 and Example 1 were measured by BET (Brunauer, Emmett, Teller) analysis using a BET specific surface area meter (ASAP-2020 instrument from Micromeritics, USA). Specifically, the BET specific surface area (S) of the activated carbon due to nitrogen gas adsorption at 77 K BET ) was calculated. The volume of each pore was measured using the nitrogen adsorption and mercury porosimetry technique. The ratio of each pore refers to the ratio of the volume of each pore to the total pore volume, and was calculated by measuring the total pore volume and the volume of each pore.

[0127] Iodine adsorption capacity:

[0128] The iodine adsorption capacity of the activated carbon prepared by the method according to Comparative Examples 1 and 2 and Example 1 above was measured in accordance with KS M 1802-a.

[0129] Classification Comparative Example 1 Comparative Example 2 Example 1 Name General Activated Carbon Super Activated Carbon Ultra Activated Carbon Activator Water (Liquid) Water (Liquid) Water (Liquid) Activator Content (Secondary Activation Step) - 95 parts by weight 110 parts by weight Primary Activation Temperature / Time 830℃ / 2 hours 830℃ / 2 hours 830℃ / 2 hours Secondary Activation Temperature / Time - 870℃ / 4 hours 950℃ / 6 hours Micropore Ratio (vol%) 96 vol% 90 vol% 75.9 vol% Mesopore Ratio (vol%) 3 vol% 8 vol% 20.5 vol% Macropore Ratio (vol%) 1 vol% 2 vol% 3.6 vol% BET Specific Surface Area (m² 2 / g)1,113 m 2 / g1,765 m 2 / g2,207 m 2 / g Total pore volume (cm²) 3 / g)0.45 1.15 1.28 Micropore volume (cm²) 3 / g)0.40 0.85 0.97 Mesopore volume (cm²) 3 / g)0.03 0.20 0.26 Macropore volume (cm²) 3 / g)0.02 0.10 0.05 Iodine adsorption capacity (mg / g) 1,052 1,831 1,853

[0130] [Manufacturing Example 2: Manufacture of a Smoking Article]

[0131] Preparation Example 2-1: Regular smoking product

[0132] The smoking product consists of a filter section and a medium section (cut grass weight: approximately 590 mg). Along the longitudinal direction of the smoking product, the filter section (length: 27 mm) is divided into a first section and a second section. Here, the first section is adjacent to the mouth end (ME) relative to the second section and has a length of approximately 15 mm. The second section is adjacent to the medium section relative to the first section and has a length of approximately 12 mm. At this time, the unencapsulated pressure drop (UPD) of the smoking product was controlled to approximately 61 mm H2O, and the ventilation rate (VR) to approximately 81%.

[0133] As described in Table 2 below, a filter section was manufactured by adjusting the content of activated carbon according to Comparative Examples 1 and 2 and Example 1 to 24 mg / 12 mm relative to the total length of the second section.

[0134] Classification Specifications and Raw Material Usage Classification Physical Properties Filter Length (mm) Suction Resistance (mmH2O) Tow (De) Plasticizer (TEC, %) Activated Carbon (mg / 12mm) Suction Resistance (mmH2O) Circumference (mm) Weight (mg) Activated Carbon Content Part 1 Part 2 Part 1 Part 2 Finished Product Part 1 Part 2 Part 1 Part 2 Type Part 2 Average Deviation Average Average mg / tip Comparative Example 1 (General) 15 1 25 3.7 5 6 1.2 5 4 6 0 3.0 / 35 K 2.5 / 45 K 9 8 General 2 4 4 5 6.8 9.2 2 4.2 0 8 5 3.7 2 5.2 Comparative Example 2 (Super) 15125 3.756 1.25460 3.0 / 35K 2.5 / 45K 98 Super 2446 2.48 424 2.208 50.8 25.4 Example 1 (Ultra) 15125 3.756 1.25460 3.0 / 35K 2.5 / 45K 98 Ultra 2446 5.41 1.72 4.228 43.3 25.3

[0135] Preparation Example 2-2: Ultra-slim smoking product

[0136] The smoking product consists of a filter section and a medium section (cut grass weight: approximately 350 mg). Along the longitudinal direction of the smoking product, the filter section (length: 30 mm) is divided into a first section and a second section. Here, the first section is adjacent to the mouth end (ME) relative to the second section and has a length of approximately 15 mm. The second section is adjacent to the medium section relative to the first section and has a length of approximately 15 mm. At this time, the unencapsulated pressure drop (UPD) of the smoking product was controlled to approximately 94 mm H2O, and the ventilation rate (VR) to approximately 84%.

[0137] As shown in Table 3 below, a filter section was manufactured by adjusting the content of activated carbon according to Comparative Examples 1 and 2 and Example 1 to 13.5 mg / 15 mm relative to the total length of the second section.

[0138] Classification Specifications and Raw Material Usage Classification Physical Properties Filter Length (mm) Suction Resistance (mm H2O) Cellulose Acetate Tow (De) Plasticizer (TEC, wt%) Activated Carbon (mg / 15 mm) Suction Resistance (mm H2O) Circumference (mm) Weight (mg) Activated Carbon Content Part 1 Part 2 Part 1 Part 2 Finished Product Part 1 Part 2 Part 1 Part 2 Type Part 2 Average Deviation Average Average mg / tip Reference Example (Bamboo) 15 15 6 6.6 7 1 13.3 3 7 2 0 6.0 / 17 K 5.9 / 2 1 K 10 10 Bamboo 13.5 7 3 1.2 2 0.4 16.6 9 5 2 5.6 14.5 Comparative Example 1 (General) 15 15 66.6 7 113.3 37 20 6.0 / 17 K 5.9 / 21 K 10 10 General 13.5 7 22.4 17.9 16.7 25 29.7 15.2 Comparative Example 2 (Super) 15 15 66.6 7 113.3 37 20 6.0 / 17 K 5.9 / 21 K 10 10 Super 13.5 7 30.1 15.1 16.7 05 22.0 15.3 Example 1 (Ultra) 15 15 66.6 7 113.3 37 20 6.0 / 17 K 5.9 / 21 K 10 10 Ultra 13.5 7 31.0 15.3 16.7 15 19.7 14.3

[0139] [Experimental Example 1: Effect of Reducing Carbonyl Vapor Phase Components]

[0140] The results of analyzing the carbonyl smoke component reduction effect for each of the smoking products according to Manufacturing Examples 2-1 and 2-2 above by collecting the generated carbonyl components in an acetonitrile solution containing a 2,4-DNPH (2,4-dinitrophenylhydrazine) derivative and analyzing them using HPLC (High Performance Liquid Chromatography) are shown in Tables 4 and 5 below.

[0141] Meanwhile, in Tables 4 and 5 below, Form is formaldehyde, Acet is acetaldehyde, Propion is propionaldehyde, Croton is crotonaldehyde, MEK is methyl ethyl ketone, and Butyr is butyraldehyde.

[0142] [Preparation Example 2-1: Regular] Carbonyls [μg / cig.]Form Acetate Acetone Acrolein Propion.Croton.MEKButyr.Total Comparative Example 1 (General) 0.183 2.72 20.868 0.172 0.21 00.009 0.181 0.159 4.51 Comparative Example 2 (Super) 0.165 1.25 10.26 10.05 20.064 0.002 0.05 00.042 1.89 Example 1 (Ultra) 0.168 1.138 0.196 0.039 0.048 0.003 0.04 00.03 11.66 Example 1 Reduction Rate Comparative Example 1 Comparison 8.1858.2077.4377.1377.34-77.9480.7163.10 Comparison Example 2 Comparison-9.0624.9024.3625.13-19.4626.9811.86

[0143] [Preparation Example 2-2: Ultra-slim] Carbonyls [μg / cig.]Form.Acet.AcetoneAcroleinPropion.CrotonMEKButyr.Total Reference Example (Bamboo) 3.94062.20720.4334.4474.3400.2534.3673.073103.1 Comparative Example 1 (General) 3.82048.20714.1073.1132.6530.1002.7072.18776.9 Comparative Example 2 (Super) 3.30025.3603.5100.6800.9500.0000.4300.30034.5 Example 1 (Ultra) 3.0 20 20.5 00 2.6 00 0.5 5 30.8 300 0.0 0 0.3 00 0.2 00 28.0 Example 1 Reduction Rate Compared to Reference Example 23.3 56 7.0 58 7.2 88 7.5 68 0.8 8 -9 3.1 39 3.4 97 2.8 3 Compared to Comparative Example 1 20.9 45 7.4 78 1.5 78 2.2 368 8.7 2 -8 8.9 29 0.8 56 3.5 8 Compared to Comparative Example 2 8.4 81 9.1 62 5.9 318 8.6 312.6 3 -30 233 3.3 318.9 3

[0144] Referring to Tables 4 and 5 above, it was confirmed that the smoking product containing the activated carbon of Example 1 had a superior effect in removing carbonyl smoke components compared to Comparative Examples 1 and 2. In addition, in Table 5 above, it was confirmed that the smoking product containing the activated carbon of Example 1 had a superior effect in removing carbonyl smoke components compared to the smoking product containing activated carbon manufactured using bamboo as a raw material (Reference Example).

[0145] [Experimental Example 2: Evaluation of Volatile Organic Compound (VOC) Removal]

[0146] Volatile organic compounds (VOCs) generated while smoking each of the smoking products according to Preparation Examples 2-1 and 2-2 under ISO 21330 conditions were collected in 20 mL of a methanol solution containing 200 μl of internal standard solution, and the results of the analysis using a gas chromatography-mass spectrometry (Agilent Technologies, 6890N Network GC system) are shown in Tables 6 and 7 below.

[0147] [Preparation Example 2-1: Regular] VOCs [μg / cig.] 1,3-Butadiene Isoprene Acrylonitrile Benzene Toluene Total Comparative Example 1 (General) 5.49 4 1.35 <LOQ3.162.2652.3비교예 2(슈퍼)1.7812.64<LOQ0.880.9116.2실시예 1(울트라)1.379.16<LOQ0.660.8312.0실시예 1 감소율비교예 1 대비74.9877.84-79.1163.2576.99비교예 2 대비22.9827.49-25.138.6925.81

[0148] [Preparation Example 2-2: Ultra-slim] VOCs [μg / cig.] 1,3-Butadiene, Isoprene, Acrylonitrile, Benzene, Toluene Total Reference Example (Bamboo) 3.97 2.3.4 10.2 2.2 2.39 3.2.2 Comparative Example 1 (General) 3.25 18.7 00.1 71.7 32.0 125.9 Comparative Example 2 (Super) 0.72 3.57 <LOQ0.190.815.3실시예 1 (울트라)0.573.33<LOQ0.160.794.8실시예 1 감소율참조예 대비85.5285.76-92.9867.2184.95비교예 1 대비82.3282.17-90.9960.8981.25비교예 2 대비19.636.50-17.202.708.08

[0149] [Experimental Example 3: Sensory Evaluation of Smoking Products]

[0150] Twenty evaluation panelists were selected to evaluate the amount of smoke, smoke suction, inhalation intensity, irritation, and off-flavor during smoking of the smoking product according to Manufacturing Example 2-1. The significance level was set to 0.05. If the significance probability of a sensory evaluation item is 0.05 or less, it means that the type of activated carbon influences the performance regarding the evaluation item.

[0151] Preparation Example 2-1: Regular Amount of rich smoke Smoke suction Flavor intensity Stimulation Different taste during smoking Comparative Example 1 (General) 5.10 4.27 4.80 5.13 3.47 Example 1 (Ultra) 5.07 4.10 4.45 4.70 3.40 Significance probability (P-value) 0.79 0.14 0.05 0.04 0.55

[0152] Referring to Table 8 above, Example 1 has a BET specific surface area of ​​2,000 m² compared to Comparative Example 1. 2 The result showed lower spiciness and irritation by controlling the ratio of micropores in the activated carbon to 70 to 80 vol% and being greater than / g.

[0153] The features described in the above-described embodiment may be combined with other embodiments unless explicitly stated otherwise. Furthermore, although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0154] [Explanation of the symbol]

[0155] 100: Smoking items

[0156] 10: Filter section

[0157] 10a: Part 1

[0158] 10b: Part 2

[0159] 20: Medium

Claims

1. Activated carbon comprising micropores with a pore diameter of less than 2 nm, Based on the total pore volume of the activated carbon, the ratio of the micropores is 70 to 80 vol%, and The BET specific surface area of ​​the above activated carbon is 2,000 m² 2 / g or more, Activated carbon.

2. In Paragraph 1, The volume of the above micropores is 0.8 to 1.1 cm³ 3 / g person, Activated carbon.

3. In Paragraph 1, It further includes mesopores having a pore diameter of 2 nm or more and 50 nm or less, and Based on the total pore volume of the activated carbon, the ratio of the mesopores is 15 to 25 vol%, Activated carbon.

4. In Paragraph 3, The volume of the above mesopore is 0.2 to 0.4 cm³ 3 / g person, Activated carbon.

5. In Paragraph 1, Further comprising macropores having a pore diameter greater than 50 nm, The ratio of the macropores is 1 to 5 vol% based on the total pore volume of the activated carbon, Activated carbon.

6. In Paragraph 5, The volume of the above macropores is 0.01 to 0.10 cm³ 3 / g person, Activated carbon.

7. In Paragraph 1, The BET specific surface area of ​​the above activated carbon is 2,200 m² 2 / g or more, Activated carbon.

8. In Paragraph 1, The total pore volume of the above activated carbon is 1.0 cm 3 / g or more, Activated carbon.

9. A filter for smoking products comprising activated carbon according to any one of paragraphs 1 through 8.

10. Filter section; and A medium portion disposed on one side of the filter portion; comprising The above filter portion includes a filter for smoking products according to claim 9, Smoking items.

11. In Paragraph 10, The above filter unit is: Part 1 and It includes a second part different from the first part above, and The second part is closer to the medium part than the first part, and The above second part includes a filter for the smoking product, Smoking items.

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