Biodegradable filter with improved taste

Abstract

To provide a biodegradable filter for a smoking article with a good taste profile.SOLUTION: A filter for a smoking article comprises: a segment comprising a filtration substrate comprising natural cellulose fibers, the filtration substrate comprising a composition comprising an additive for reducing phenols; and a wrapper at least partly surrounding the segment.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a smoking article having improved biodegradability and having an improved taste during smoking of the smoking article. This invention relates to filters for smoking articles. [Background technology]

[0002] Smoking article filters are typically selective for filtering phenols, but It is made of cellulose acetate tow, which decomposes slowly unless treated with Various materials are being tested as replacements for cellulose acetate in article filters. There are.

[0003] For example, International Publication No. 2015124242 describes a filter material containing polylactic acid. However, the present inventors also found that polylactic acid is not sufficiently biodegradable. is.

[0004] Yet another filtration material that is biodegradable is paper. In the pamphlet of No. 53, a filter having a paper substrate is shown. However, this document In the present study, the taste profile of a smoking article including a filter having a paper substrate was compared with that of a cellulose acetate-based It is taught that the profile of a smoking article having a filter is different.

[0005] Thus, a biodegradable filter for a smoking article is provided that has a good taste profile. It is necessary. Summary of the Invention [Problem to be solved by the invention]

[0006] Semivolatile compounds have been found to be important components of taste in smoking articles, such as cigarettes. In this regard, cellulose acetate filters have high filtering properties against semi-volatile components. The inventors have developed fillers based on natural cellulose fibers. We found that the filter does not have such high filtering properties. Therefore, bad taste, e.g. For example, the increase in discomfort and dryness caused by cellulose compared to cellulose acetate filters is This may be due to semi-volatile compounds such as phenols that are not filtered. The inventors have found that paper is not selective for filtering phenols and that cellulose acetate filters are not selective. They found that the resulting cigarette had a worse taste when smoked than the same cigarette having the same volatile organic compound.

[0007] The present inventors have been studying the effect of forming a filter substrate (i.e., at least one filter substrate for a smoking article) using a One segment of the substrate), e.g. paper substrate, reducing phenols such as triacetin By impregnating the material with an additive to filter out phenols, The inventors have found that the taste obtained by using a cellulose acetate filter is similar to that obtained by using a cellulose acetate filter. In order to achieve the desired taste, the amount of additives to reduce phenols can be appropriately selected. I also discovered that. [Means for solving the problem]

[0008] In a first aspect, the present invention provides a filter for a smoking article comprising: A segment comprising a filtration substrate comprising natural cellulose fibers, the filtration substrate comprising a phenol a segment comprising a composition including an additive for reducing chlorine; a wrapper at least partially surrounding the segment; Including, regarding filters.

[0009] Further disclosed is a smoking article comprising a filter of the present invention.

[0010] The present invention further provides a method for producing a filter rod, comprising the steps of: Providing a filtration substrate comprising natural cellulose fibers; forming a continuous rod from the filtration substrate; applying a composition to the filtering substrate, the composition reducing phenols; and including an additive for causing the wrapping a continuous band of packaging material around said continuous rod; The wound continuous rod is cut to obtain filter rods of a desired length. Tep and The present invention relates to a method, comprising:

[0011] Further provided is a method for producing a filter segment for a filter of the present invention, comprising the steps of: A filter rod obtained by the method for producing a filter rod according to the present invention is provided. Tep and; The filter rod is cut to obtain filter segments of a given segment length. Tep and A method is disclosed that includes:

[0012] Further aspects and embodiments of the invention are disclosed in the dependent claims and in the following description and examples. The present invention can be found in, but is not limited to,

[0013] The accompanying drawings illustrate embodiments of the present invention and provide a further understanding thereof. In the context of this description, this serves to explain the concepts and principles of the present invention. The embodiments and many of the advantages described can be best understood in connection with the drawings. [Brief description of the drawings]

[0014] [Figure 1] 4 shows the results of a leakage test in Example 1. [Diagram 2] 4 shows the results of a leakage test in Example 1. [Diagram 3] Filtration efficiency results are shown. [Figure 4] Selectivity results are shown. [Diagram 5] The results of the taste test are shown in Example 3. [Figure 6] 13 shows the results of a leakage test in Example 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] definition Unless otherwise defined, technical and scientific terms used herein refer to the present invention. has the same meaning as commonly understood by those skilled in the art.

[0016] The term "phenols" refers to compounds that have one or more hydroxyl groups attached to an aromatic hydrocarbon radical. Examples include phenol, o-cresol, m-cresol, phenol, p-cresol, and catechol. "Additives for making the product burnt" are substances that are capable of burning a substance, as can be measured, for example, using a standard smoking test. The filter of the present invention is used to filter smoke obtained in combustion or non-combustion applications. When used in the same manner, phenols, such as phenol, o-cresol, m-cresol, p- Additives capable of reducing at least one of cresol and / or catechol It is a drug.

[0017] As used herein, the terms "filter substrate comprising natural cellulose fibers" and "filter substrate" refer to Words correspond to one another unless the context makes it clear that they are not.

[0018] All values ​​presented in this disclosure are expressed as "about" unless the context makes clear to the contrary. " should be understood to be supplemented by the words "

[0019] As used herein, wt. % should be understood as weight percent. In this disclosure, unless otherwise clearly indicated or apparent from the context, In this disclosure, further, in one particular embodiment, all amounts are given in units of weight percent. All amounts given in percent by weight in the figures add up to 100% by weight. Unless otherwise indicated or clear from the context, is calculated in each embodiment by dividing the mass of each component by the total mass.

[0020] In a first aspect, the present invention provides a filter for a smoking article comprising: A segment comprising a filtration substrate comprising natural cellulose fibers, the filtration substrate comprising a phenol a segment comprising a composition including an additive for reducing chlorine; a wrapper at least partially surrounding said segment; Including, regarding filters.

[0021] The filter of the present invention may be composed of one or more segments and is effective in reducing phenols. The present invention relates to a filtration substrate comprising natural cellulose fibers, the composition including an additive for reducing the amount of There is no particular limitation in this respect, so long as it contains at least one segment. These segments may, for example, be separated by further segments to form the filtrates of the present invention. The filters of the present invention may be, for example, single filters, double filters, or the like. Filter, triple filter, single or multiple cavity filter, or any of the above. The additional segments may be any combination of filters. .

[0022] Preferably, the outer diameter of the filters and smoking articles according to the invention is between about 4 mm and 9 mm. More preferably, the thickness is between about 5 mm and 8 mm, for example, about 5.3 mm, about 6.9 mm, or about 7. It is .7mm.

[0023] Preferably, the overall length of the filter according to the present invention is between about 11 mm and about 40 mm, more preferably Preferably, the thickness is between about 17 mm and 30 mm, for example, about 21 mm, about 27 mm, or about 30 mm. It is.

[0024] Preferably, of a filter having two or more filter segments according to the invention. Each individual segment length is between about 5 mm and about 22 mm.

[0025] In the present invention, particularly in the case of a filtration substrate, natural cellulose fibers are obtained from natural sources, such as plants. As long as the fibers can be used in a wide range of applications, there is no particular limitation. Suitable natural cellulose fibers include, for example, flax. , bagasse, esparto, straw, cotton, papyrus, bamboo, jute, hardwood, and softwood. Natural cellulosic fibers may be obtained from more than one source. For example, they may be obtained from several types of wood.

[0026] Furthermore, the filtration substrate is not particularly limited. For example, the filtration substrate may be in the form of a woven or nonwoven fabric. Alternatively, the material may comprise natural cellulose fibers in the form of filaments, but preferably the material comprises cellulose fibers in the form of filaments. The filter is in non-woven or filament form to make it easier to manufacture. According to one embodiment, the filtration substrate is made from wood pulp. It is substantially free of cellulose acetate fibers, and in particular free of cellulose acetate fibers.

[0027] According to certain embodiments, the filtration substrate may be provided in sheet form, for example as paper. In these embodiments, the filtration substrate, e.g., paper, can be rolled, crimped, corrugated, or By molding or folding, it can be made into a continuous lot. According to an embodiment, the filtration substrate is paper, preferably corrugated cardboard, whereby the filtration The composition containing the additive for reducing phenols can be easily applied and maintained, The filters are easy to manufacture.

[0028] According to certain embodiments, the filtration substrate is in filament form, such as a woven or nonwoven substrate. In these embodiments, the textile substrate can be provided in the form of a nap. A continuous rod can be formed from the filtration substrate by forcing it through a forming funnel under tension. It may also be provided in a randomly oriented form.

[0029] In a preferred embodiment, the filtration substrate is a sheet-like material comprising natural cellulose fibers, e.g. The sheet-like material may also contain lignin. Furthermore, the sheet-like material may be composed of hemicelluloses, such as glucuronoxylan, arabinoxylan, etc. , glucomannan, and xyloglucan, and mixtures thereof. In addition, the sheet material may contain calcium carbonate, kaolin, clay, talc, titanium dioxide, alumina, etc. The group consisting of lumina trihydrate, precipitated silicas and silicates (PSS), or mixtures thereof The composition may also include a filler material which may be selected from:

[0030] According to one embodiment, the sheet-like material, e.g. paper, comprises: - natural cellulose fibres in an amount between 40 and 100% by weight, - lignin in an amount ranging from 0 to 20% by weight, - hemicellulose in an amount of 0-20% by weight, - containing a filler material in an amount of 0-55% by weight, The weight percent of a sheet material is a percentage based on the total dry basis weight of the sheet material.

[0031] Sheet material: 5 to 130 g / m 2 , preferably 10 to 110 g / m 2 Drying in the range In some embodiments, the sheet material may have a dry basis weight of 25 to 80 g / cm. m 2 , for example 30-60g / m 2 The dry basis weight can be in the range of If it is too thick, the filter may be difficult to manufacture due to its low tensile strength. If the pressure is too high, the sheet material may become too inflexible and the appropriate pressure drop may not be achieved. It may not be realized.

[0032] Sheet material has a viscosity of 36,000s / 10ml measured according to DIN 53 137 In a preferred embodiment, the sheet material has a filtration rate of 0.1 Between s / 10ml and 300s / 10ml, for example, in the range of 1s / 10ml to 5s / 10ml For example, the filtration rate may be 2 s / 10 ml.

[0033] In the filter of the present invention, the additive for reducing phenols is not particularly limited. According to one embodiment, the additive for reducing phenols is triacetin, chlorine ... Triethyl enoate (TEC), propylene glycol, e.g. 100-8,000 Daltons Polyethylene glycol having a weight average molecular weight between 100 and 8,000 da. Polypropylene glycols having a weight average molecular weight between 100 and 1500 mol / L, and mixtures thereof Preferably, the additive for reducing phenols comprises triacetin. More preferably, the additive for reducing phenols is triacetin.

[0034] In the filter of the present invention, the wrapper that at least partially surrounds the segment is particularly It can include, but is not limited to, one or more layers, which may be partially or entirely within the filter. Preferably, the entire segment may be included. If more than one segment is included, A wrapper may be provided for two or more, or even all, of the separate segments. and / or a wrapper can be provided on every segment of the filter. More than one wrapper can be provided for the filter. In addition, the wrapper may be made of a biodegradable material such as a natural cellulosic material, e.g., paper, cardboard, etc. It can be printed, embossed, debossed, decorated, etc. One of the preferred materials for this purpose is paper.

[0035] In one embodiment, the composition comprises a filtration substrate containing an additive for reducing phenols. The binder further comprises a bonding agent or binder for bonding the composition (phenol The viscosity of the mixture (including additives and binders for reducing phenols) is increased, thereby Additives to reduce chlorine are added to further stabilize the filter.

[0036] According to one embodiment, the composition has less than 20% by weight of bond, based on the total weight of the composition. i.e. the composition includes an additive for reducing phenols and a binder. In particular, the composition consists essentially of an additive for reducing phenols and a binder, or even consisting of. In certain preferred embodiments, the composition comprises, based on the total weight of the composition: 0.5 to 15% by weight, preferably 1.5 to 10% by weight, particularly preferably 2 to 8% by weight % binder, for example 2, 4, or 8 wt. % binder. The product contains an additive for reducing phenols, particularly triacetin, and a binder, particularly acetic acid. In such a case, the composition essentially consists of cellulose. The remainder up to 00% by weight is an additive to reduce phenols. Binder If the amount is too low, there is a risk that additives intended to reduce phenols will leak into the wrapper. Too much binder can cause too much viscosity increase and lead to If the amount of binder is too large, it will be difficult to manufacture the filter. The viscosity of the composition containing the additives and binders for the purpose of filtering becomes too high, making the manufacture of the filter difficult. If the amount of binder is too small, it may be difficult to reduce the amount of phenols on the filter substrate. The retention of additives to allow the binder to be mixed is reduced. Higher amounts of binder can lead to phenol This can reduce the amount of additives leaking to reduce dust.

[0037] According to one embodiment, when measured at 50° C. and standard pressure of 101,325 Pa, The dynamic viscosity of the composition containing the additive for reducing phenols and the binder is 5.00. The dynamic viscosity is measured using the rotational viscosity method according to ISO 3219:1993. In a preferred embodiment, an additive for reducing phenols is used. The dynamic viscosity of the composition containing the additive and binder is measured at 50°C and standard pressure of 101,325 Pa. The viscosity is between 50 and 1,500 mPas, preferably between 300 and 1,000 mPas. This method makes it easy to spray the composition for producing the filter of the present invention and directly More complicated application methods such as direct injection can be avoided.

[0038] According to one embodiment, a filtration substrate and an additive and binder for reducing phenols are provided. The binder is present in an amount of less than 7% by weight, based on the total weight of the composition including the binder. According to a preferred embodiment, a filter substrate and an additive and a binder for reducing phenols are provided. Based on the total weight of the composition including the mixture, the binder is preferably between 0.2 and 5.0% by weight. or between 0.4 and 4.0% by weight, more preferably between 0.6 and 3.3% by weight, particularly preferably It is preferably contained in an amount between 0.8 and 2.6% by weight.

[0039] According to one embodiment, the binder is cellulose acetate. According to one embodiment, the degree of substitution of cellulose acetate is not limited to 2.1 to 2.9. The degree of substitution is preferably between 2.1 and 2.6, for example about 2.4. Affinity for overbase materials and additives to reduce phenols, especially triacetin Therefore, additives for reducing phenols, especially triacetin, are used. It is preferable to reduce phenols, especially before applying to the filter substrate. The cellulose acetate form is dissolved in triacetin, an additive to reduce the is not particularly limited, and may be in the form of fibers, such as short fibers, particles, flakes, etc. Triacetin can dissolve cellulose acetate as a binder, and phenols A good reduction in the

[0040] As used herein, the degree of substitution (DS) of a polymer is, in the case of a condensation polymer, is the average substituent group attached per base unit, or per monomer unit in the case of addition polymers. In particular, in the case of cellulose acetate, the degree of substitution of cellulose acetate is expressed as the number of monomer units per unit. The average number of substituents bonded per unit area is referred to as the average number of substituents bonded per unit area.

[0041] According to one embodiment, the ratio of the binder to the total weight of the filtering substrate is 0.5% or more, preferably The present inventors have found that the filter of the present invention has a porosity of 0.8% or more, and particularly preferably 1% or more. The binder in the rubber not only acts as a carrier for the additive to reduce phenols, It also acts as a thickener in compositions containing additives to reduce phenols. It is also possible to increase the viscosity of the composition, thereby increasing the viscosity of the composition in the filtration substrate. It has been found that the retention of pressure can be improved and leakage can be reduced.

[0042] According to an embodiment, the composition comprises a filter for phenol to total particulate matter. - in an amount such that the filtration selectivity of the segment is at least 2, where filtration selectivity S X (centre In the case of phenol, the formula is:

number

[0043] In some embodiments, the filter may be filled with a variety of materials, such as charcoal and / or flavor particles. The form and amount of such granules are not particularly limited, and the smoking article may include any of the following granules: In the amount, size, and composition thereof, the amount and composition may be as commonly used in filters for automobiles, e.g., cigarette filters. Other conventional parameters may be included.

[0044] According to one embodiment, the filter of the present invention comprises triacetin and cellulose acetate. At least one segment comprising a filtration substrate comprising natural cellulose fibers, e.g., paper; and a wrapper at least partially surrounding the segment. The filters of the present invention are made of natural cellulose fibers, such as paper, triacetin, and acetate cellulose. and a wrapper, e.g., a paper wrapper. do.

[0045] According to one embodiment, the composition comprises 10 to 20% by weight of the filtration substrate and the composition. 35% by weight, i.e., the composition contains an additive for reducing phenols. and optionally a binder. In particular, the composition comprises an additive for reducing phenols. According to one preferred embodiment, the composition comprises a filtration substrate and a binder. Based on the weight of the compound, the amount is 10 to 13% by weight, 20 to 24% by weight, or 30 to 35% by weight. For example, about 10% by weight, between 20 and 21% by weight, between 30 and 32% by weight, stomach.

[0046] According to one embodiment, the additive for reducing phenols comprises a filtering medium and a phenol-containing filter medium. Based on the total amount of the composition including the additive for reducing nols and the binder, According to a preferred embodiment, the phenol-reduced The additive for reducing the amount of phenols contained in the filter medium and the binder. Based on the total amount of the composition including the component (s), the amount is between 9 and 11% by weight, and the amount is between 19 and 21% by weight. or between 28 and 32% by weight. Higher amounts can better reduce the phenols in the smoke that contain them. However, if the amount is too large, there is a risk of leakage of the additive for reducing phenols. If the amount of additive to reduce phenols is too small, the phenols will not be sufficiently reduced. It cannot be reduced.

[0047] Further disclosed is a smoking article comprising a filter of the present invention. The further components are not particularly limited and may include components commonly used in smoking articles. can be done.

[0048] In addition to filters, smoking articles can also include, for example, aerosol-generating substrates, such as cigarettes. Tobacco rods in tobacco containers, or in non-combustion applications, e.g., tobacco or nicotine heating only Aerosol-generating materials, such as tobacco or nicotine, that are used but not burned When the smoking article is, for example, a cigarette, the tobacco rod may include a substrate containing the tobacco rod. There may be tipping paper to connect the cord and the filter.

[0049] 1. A method for manufacturing a filter rod, comprising: Providing a filtration substrate comprising natural cellulose fibers; forming a continuous rod from the filtration substrate; applying a composition to the filtering substrate, the composition reducing phenols; and including an additive for causing the wrapping a continuous band of packaging material around said continuous rod; Optionally, the wound continuous rod is cut to produce filter rods of a given rod length. obtaining a data; A method is also disclosed, including:

[0050] Preferably, the method is carried out in this order. The filter or at least one segment thereof can be manufactured. Each of the features discussed with respect to the filter is incorporated herein by reference in its entirety for the purposes of manufacturing a filter rod. This also applies to the method of

[0051] Providing a filtering substrate; the filtering substrate is not particularly limited in terms of size, circumference, etc., and is suitable for use in smoking articles. A continuous rod may be formed from the filtration substrate, such as in a conventional filter. applying the composition to the filtration substrate; winding the composition onto a continuous rod; The step of cutting the wound continuous rod is not particularly limited, and may be performed by cutting a continuous rod for a smoking article. This can be done in the same manner as in the conventional filter manufacturing method.

[0052] In some embodiments, the filtration substrate can be provided in a sheet-like form. In embodiments, the material may be rolled, crimped, corrugated, or folded (all of which are particularly A continuous rod can be formed from the filtration substrate by a variety of techniques, including but not limited to:

[0053] In another embodiment, the filtration substrate is provided in filament form, e.g., in the form of a woven substrate. In these embodiments, the woven substrate can be napped and pressed under tension into a forming funnel. A continuous rod can be formed from the filtration substrate by passing the filtration substrate through a filter. When the material is provided in the form of a laminate, it can be processed by a conventional machine, for example as described in WO 2009 / 023366. No. 080368, International Publication No. 2009 / 093051, International Publication No. 2013 / 068337 Brochure, International Publication No. 2013 / 164624 Brochure As described in the brochure and WO 2013 / 164623 Turmalin filter manufacturing machine from Hauni Maschinenbau AG can be used to form a continuous rod.

[0054] In some embodiments, the step of applying the composition to the filtration substrate comprises removing the composition from the filtration substrate by means of a rod. According to one embodiment, the step of forming a composition on the filtration substrate is performed during or after the step of forming a composition on the filtration substrate. The step of applying the agent is carried out during or after the step of winding the agent around the rod. In some cases, the composition may be, for example, as described in U.S. Pat. No. 5,387,285. For example, it may be injected as a fluid into the continuous dot or into a segment thereof.

[0055] In some embodiments, the step of applying the composition to the filtration substrate comprises removing the composition from the filtration substrate by means of a rod. This is performed before the step of forming

[0056] According to an embodiment, the step of applying the composition to the filtration substrate comprises applying the composition to the filtration substrate. The spraying method includes spraying the filter medium in the form of a continuous rod. Spraying is particularly useful where the composition is applied prior to application of the composition.

[0057] According to some embodiments, the composition is applied to the filtration substrate prior to or during the step of applying the composition to the filtration substrate. Preferably, this step is carried out to reduce the amount of phenols in the composition. This is done when the composition contains additives and binders. The composition can be heated to, for example, about 50° C. and applied at that temperature. It is applied under a standard pressure of 25 Pa.

[0058] There is further provided a method for producing a filter segment of a filter of the present invention, comprising the steps of: The filter rod obtained by the method of the present invention for producing a filter rod is providing steps; The filter rod is cut to obtain filter segments of a given segment length. Tep and A method is disclosed that includes:

[0059] Preferably, the method is carried out in the following order: This method can be used in particular to manufacture segments of the filters of the invention. Therefore, each of the features discussed with respect to the filter is essential to the fabrication of the filter segments. The present invention also applies to the method for producing a fluororesin.

[0060] The cutting of the filter rod is not particularly limited, and may be performed in the usual manner for producing filter segments. The appropriate cutting length is, for example, between 80mm and 150mm, e.g. For example, it may be about 108 mm, or about 120 mm.

[0061] The above embodiments may be combined in any way, where appropriate. Certain embodiments and implementations of the invention are specifically mentioned above or below with respect to the examples of the invention. In particular, the present invention includes combinations of features that are not included in the present invention. Individual aspects may also be added as improvements or additions to the embodiments. EXAMPLES

[0062] The present invention will now be described in detail with reference to the following examples. These examples are illustrative and are not intended to limit the scope of the invention.

[0063] Example 1 At a temperature of 22°C, various amounts of cellulose acetate were used to reduce phenols. Triacetin (GTA, glycerol triacetate) was added as an additive to the filter paper. The filter is then crimped into a rod shape. The cellulose acetate had a degree of substitution of 2.4. The paper sheet is 39 g / m 2 With a basis weight of 120 μm and a thickness of 120 μm, according to DIN 53 137 The filter rod had a filtration rate of 3.5 s / 10 ml as measured by a 126 mm filter. The tube had a length of 21 mm and a diameter of 24.2 mm and was cut into six filters of 21 mm length.

[0064] The various amounts of added components and the amount of binder present in the different sample compositions are shown in the table below. Shown in 1.

[0065] [Table 1]

[0066] The prepared filters were stored at 22°C, standard pressure, and 60% relative humidity for 10 min. The weight loss of the additive was observed after storage for 1 day and 1 month. I should mention that I could already see the liquid reducing on the cardboard that the filter was stored on.

[0067] These results are shown in Table 2, where the leakage amounts correspond to the weight differences measured for each sample. do.

[0068] [Table 2]

[0069] The leakage results for 10 days of storage are also shown in Figures 1 and 2.

[0070] As can be seen, a higher amount of cellulose acetate reduces leakage of additives. Sample 6 , 8, 9, and 10 had less than 10% leakage after one month of storage, compared to the other samples. In this case, samples 8, 9 and 10 perform particularly well.

[0071] The present inventors have determined that the total weight of the filtration substrate and the composition containing triacetin and cellulose acetate is As a standard, if cellulose acetate is contained in an amount of 0.6% by weight or more, leakage after one month The inventors confirmed that the filtration substrate, triacetin and acetic acid cell Cellulose acetate is present in an amount of 0.8% by weight or more based on the total weight of the composition containing cellulose. We also found that when included, there was a well-known reduction in leakage after one month.

[0072] The present inventors have determined that the total weight of the filtration substrate (excluding the weight of triacetin and cellulose acetate) is If the material contains 0.8% or more by weight of cellulose acetate, leakage after one month is less than 10%. The inventors have confirmed that when this ratio is 1.0% by weight or more, It was also observed that the subsequent leakage was reduced as is well known.

[0073] Example 2 Filtration efficiencies for phenol, o-cresol, and total particulate matter (TPM) were measured. To determine the size of the filter samples 1-9 ( For this purpose, filter samples 1 to 9, as well as control samples, Materials 1 and 2 were attached to tobacco rods with tipping paper and tested in a standard smoking test. The amount of phenol, o-cresol and TPM on the Cambridge filter was The filtration rate of phenol, o-cresol, and total particulate materials (TPM) was measured. I wanted over-efficiency.

[0074] Control filter 1 (Control 1) had a denier per filament of 2.5 and a total denier of 1.0. Standard cellulose acetate made from cellulose acetate tow with a neal of 31,000. The fibers were Y-shaped. The cellulose acetate fibers and triacetate fibers were Triacetin was added to cellulose acetate fibers in an amount of 8% by weight based on the total weight of the fiber. Control filter 2 (Control 2) was made of the same paper sheet material as filter samples 1-9. However, the filter did not have additives and binders to reduce phenols. .

[0075] These results are shown in FIG.

[0076] Furthermore, the filtration selectivity of phenol and o-cresol was calculated from the above formula. The results are shown in FIG.

[0077] As can be seen from Figures 3 and 4, the addition of triacetin, particularly triacetin and cellulose acetate, The addition of phenol and o-cresol increased the filtration efficiency and selectivity. with efficiency and selectivity similar to, or even superior to, cellulose acetate filters. The addition of cellulose acetate increased the selectivity for phenol and o-cresol. Sexuality decreases.

[0078] Example 3 For the cigarettes produced in Example 2 using filter samples 1, 2, and 3, A sensory evaluation was carried out by a panel of human adults, using the control filter produced in Example 2. Compared to a cigarette.

[0079] After smoking, the panel rated the cigarettes for harshness / irritability while smoking. As shown in Figure 5, the addition of triacetin reduced the irritation of the smoke. The result is a smoother smoke that is rounder and less harsh. Smoothness can be controlled by the amount of additive applied to reduce phenols. Cut.

[0080] Example 4 Three filter samples according to the invention and a control filter (Control 3) were prepared and The additive leakage was evaluated over a longer period than that of the control filter. The filters were constructed using the same paper sheet material as the filter substrate, and were coated with different amounts of additives. The additive composition consisted of triacetin and cellulose acetate only. The filter (Control 3) did not contain any additive composition. The amount of triacetin applied to the filter substrate is determined by the weight ratio of cellulose acetate to the filter substrate and the composition. The amounts are shown in Table 3 below.

[0081] [Table 3]

[0082] Samples 11-13 and the control filter were produced in Indonesia and air-shipped to Germany. These were then placed upright on a cardboard tray and stored at 22°C, standard pressure, and 50% relative humidity. After 180 days of storage, samples 11, 12, and 13 were stored in a paper tray. Stains were visible on the tray. These correspond to the amount of additive that leaked during storage. Grayscale photographs of the cardboard trays of No. 13 and Control No. 3 are shown in Figures 6a-6d, where 6a shows control 3, FIG. 6b shows sample 11, FIG. 6c shows sample 12, and FIG. The additive leakage of Samples 12 and 13, and the additive leakage of Sample 11 were much less than that of Sample 13. This supports the observation in Example 1.

[0083] Reference example 1 Film samples of different materials were cut to a size with a significant weight and placed in soil for 3 The samples were stored in a controlled room at 0°C and 90% relative humidity for 70 days. To determine the biodegradability, their weight loss was measured after 10, 20, 30 and 48 days. The results are shown in Table 3, where the percent of the original weight of the sample is The weight is expressed as a percentage.

[0084] [Table 4]

[0085] As can be seen from Table 3, the sample that decomposed the fastest was the polyvinyl alcohol sample, followed by The cellulose samples were cellulose acetate, polylactic acid, polycaprolactone, and polybutylene succinate samples degraded at a much faster rate than the polyvinyl acetate and polybutylene succinate samples. The alcohol sample was completely degraded after 10 days of storage, whereas the remaining samples were intact after the same storage period. More than 90% of the weight of the cellulose sample remained. The cellulose sample was completely decomposed after a storage period of 70 days. On the other hand, after the same storage period, cellulose acetate, polylactic acid, polycaprolactone, and polybutene The lenthic succinate sample retained over 95% of its original weight.

[0086] This is especially true for polylactic acid and cellulose acetate, which are not sufficiently biodegradable, whereas cellulose acetate is Rose has been shown to be sufficiently biodegradable.

Claims

1. A filter for a smoking article, comprising: a segment comprising a sheet-like filter substrate containing natural cellulose fibers, said filter substrate comprising a composition comprising an additive for reducing phenols and a binder for binding said additive for reducing phenols to said filter substrate; a wrapper at least partially surrounding said segment; and a filter, wherein the amount of the binder is 0.8 to 5.0% by weight based on the total weight of the filter substrate and the composition.

2. The filter according to claim 1, wherein the composition comprises less than 20% by weight of the binder based on the total weight of the composition.

3. The filter according to claim 1 or claim 2, wherein the binder is cellulose acetate.

4. The filter according to any one of claims 1 to 3, wherein the ratio of the binder to the total weight of the filter substrate is 0.5% or more.

5. The composition is included in an amount such that the filtration selectivity of the filter segment with respect to phenols relative to all particulate materials is at least 2, wherein the filtration selectivity SX is given by the formula: 【Number 1】 where E[TPM] is the filtration efficiency of the filter segment with respect to all particulate materials and E[Phenol] is the filtration efficiency of the filter segment with respect to phenols. The filter according to any one of claims 1 to 4.

6. The filter according to any one of claims 1 to 5, wherein the additive for reducing phenols is selected from triacetin, triethyl citrate (TEC), propylene glycol, polyethylene glycol, polypropylene glycol, and mixtures thereof.

7. The filter according to any one of claims 1 to 6, wherein the composition is included in an amount of 10 to 35% by weight based on the total weight of the filter substrate and the composition.

8. A smoking article comprising the filter according to any one of claims 1 to 7.

9. A method for manufacturing a filter rod according to any one of claims 1 to 7, comprising: providing a sheet-like filter substrate containing natural cellulose fibers; forming a continuous rod from said filter substrate; adding a composition to said filter substrate, said composition comprising an additive for reducing phenols; wrapping a continuous band of packaging material around the continuous rod; cutting the wrapped continuous rod to obtain filter rods of a predetermined rod length; A method comprising: **Claim 10**: The method according to claim 9, wherein the step of adding the composition to the filter substrate is performed during or after the step of forming the rod from the filter substrate. **Claim 11**: The method according to claim 9 or claim 10, wherein the step of adding the composition to the filter substrate is performed during or after the step of wrapping it around the rod. **Claim 12**: The method according to claim 9, wherein the step of adding the composition to the filter substrate is performed before the step of forming the rod from the filter substrate. **Claim 13**: The method according to any one of claims 9 to 12, wherein the step of adding the composition to the filter substrate comprises spraying the composition onto the filter substrate. **Claim 14**: The method according to any one of claims 9 to 13, wherein the composition is heated before or during the step of adding the composition to the filter substrate.

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