JP6767760B2 - Deodorant and absorbent articles with it - Google Patents

Description

The present invention relates to a deodorant containing condensed tannins and an absorbent article provided with the deodorant.

Conventionally, the deodorizing effect of condensed tannin is known. For example, Patent Documents 1 and 2 disclose deodorants containing condensed tannin (persimmon tannin) derived from persimmon astringent, and Patent Document 3 discloses. Deodorants containing condensed tannins derived from immature fruits of apples, pears, or peaches are disclosed.

Japanese Unexamined Patent Publication No. 2001-302483 JP-A-2002-177376 JP-A-2002-47196

As described above, the deodorizing effect of condensed tannin has been known so far, but it is required to further enhance the deodorizing effect. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a deodorant material containing condensed tannin and exhibiting an excellent deodorizing effect.

The deodorant material of the present invention that has been able to solve the above problems is characterized in that it contains cellulose diacetate fibers and condensed tannins. The deodorant of the present invention exhibits an excellent deodorizing effect due to the synergistic action of condensed tannin and cellulose diacetate fiber.

Condensed tannins are preferably derived from persimmon astringent from the viewpoint of enhancing the deodorizing effect. Further, the cellulose diacetate fiber is preferably a tow open fiber.

The present invention also provides an absorbent article with the deodorant of the present invention.

The deodorant of the present invention exhibits an excellent deodorizing effect due to the synergistic action of condensed tannin and cellulose diacetate fiber.

The deodorant material of the present invention contains cellulose diacetate fiber and condensed tannin. The deodorant material of the present invention can exhibit an excellent deodorizing effect for a long period of time due to the synergistic action of condensed tannin and cellulose diacetate fiber.

Condensed tannins include persimmon nuts (persimmon astringent), immature bananas, grape skins and seeds, chestnut skins, black tea, bean seed coats such as locust bean, tamarind and cod, and bark and wood parts such as oak, kepracho and mimosa. It is contained in and can be obtained as a concentrate by squeezing or extracting with a solvent (for example, hot water or alcohol).

The condensed tannin is preferably a compound having a structure in which a plurality of hydroxyl groups are bonded to the flavan skeleton, and the carbons at the 3-position, 5-position and 7-position and 2 in the structural formula of the flavan skeleton shown in the following formula (1). It is preferable that at least two or more hydroxyl groups are bonded to at least two selected from the carbons at the 3', 4'and 5'positions of the phenyl group bonded to the position. In particular, the condensed tannin is preferably a compound having a flavan skeleton in which a hydroxyl group is bonded to carbons at at least the 5-position, the 7-position, the 3'-position, and the 4'-position, and such a structure is contained in a natural product. Many condensed tannins have are known. Further, as a condensed tannin, a hydroxyl group bonded to the carbon at the 3-position of the flavan skeleton is also known to be esterified, and the hydrogen atom of the hydroxyl group is a galloyl group (3,4,5-trihydroxybenzoyl group). A compound having a structure substituted with) is known. It is considered that condensed tannin can be immobilized by interacting with the odor-causing molecule (odor molecule) at multiple points by a plurality of hydroxyl groups bonded to the flavan skeleton.

As the condensed tannin, it is preferable that the flavan skeleton in which a plurality of hydroxyl groups are bonded is a compound having a structure in which a plurality of flavan skeletons are linked via a carbon-carbon bond. If condensed tannin having a structure in which a plurality of flavan skeletons are connected is used, it is considered that odor molecules can be included and fixed, and the deodorizing effect can be enhanced. For example, in natural products, condensed tannins having a structure in which a plurality of flavan skeletons are connected are known in which the carbon at the 4-position and the carbon at the 8-position of the flavan skeleton shown above serve as bonding sites.

As the condensed tannin having a structure in which a plurality of flavan skeletons are connected, for example, one having a repeating unit represented by the following formula (2) is preferably used. In the following formula (2), R ¹ represents a hydrogen atom or a hydroxyl group, and R ² represents a hydrogen atom or a galloyl group.

The condensed tannin preferably has a weight average molecular weight of 2,000 or more, more preferably 3,000 or more, and further preferably 5,000 or more, from the viewpoint of enhancing the deodorizing effect. The condensed tannin having such a weight average molecular weight has a structure in which a plurality of flavan skeletons are connected. On the other hand, the upper limit of the weight average molecular weight of condensed tannin is not particularly limited, but the weight average molecular weight is preferably 500,000 or less, more preferably 300,000 or less, from the viewpoint of increasing solubility and improving handleability. 150,000 or less is more preferable. The weight average molecular weight shall be a polystyrene-equivalent value measured by gel permeation chromatography.

As the condensed tannin, it is preferable to use one derived from persimmon astringency. Kakitannin, which is a condensed tannin derived from persimmon astringent, has a structure in which about 12 to 30 flavan skeletons in which a plurality of hydroxyl groups are bonded are connected, and exhibits a particularly high deodorizing effect. Persimmon astringency can be obtained, for example, by fermenting a squeezed juice obtained by squeezing immature astringent persimmon fruits, which may be used as it is, and is appropriately concentrated, diluted, filtered, and extracted as necessary. , Drying and the like may be performed. Commercially available products may be used for persimmon astringency.

The cellulose acetate fiber is a semi-synthetic fiber obtained by acetic acid esterification of cellulose, and two types of cellulose diacetate fiber and cellulose triacetate fiber are widely used. In the present invention, among these, cellulose diacetate fiber is used. Cellulose diacetate has 2.1 to 2.7 hydroxyl groups acetylated on average among the 3 hydroxyl groups contained in the repeating unit of anhydrous glucose of cellulose, that is, the degree of substitution is 2.1. It is preferably ~ 2.7.

The present inventors examined the deodorizing effect of condensed tannins on various types of fibers, and found that a particularly excellent deodorizing effect was exhibited when cellulose diacetate fibers were used. Became clear. For example, when synthetic fibers are supported with condensed tannins, or when cellulose triacetate fibers having a structure similar to that of cellulose diacetate fibers or simple cellulose fibers (that is, cellulose fibers not acetic acid esterified) are supported with condensed tannins. Compared with the case, when the cellulose diacetate fiber is supported with condensed tannin, the deodorizing effect is maintained for a long time. The reason why the cellulose diacetate fiber shows an excellent deodorizing effect is not clear, but when the condensed tannin comes into contact with the cellulose diacetate fiber, the condensed tannin becomes cellulose due to the hydrogen bond of the hydroxyl group of each. It is presumed that the condensed tannin and the cellulose diacetate fiber are immobilized on the diacetate fiber, and the odor molecule can be stably included and fixed in cooperation with the cellulose diacetate fiber. In addition, it is presumed that the hydroxyl group and acetoxy group of the cellulose diacetate fiber also exert the effect of collecting odor molecules. On the other hand, when condensed tannin is supported on a simple cellulose fiber, the ability to collect odor molecules is reduced or the ability to cling and fix odor molecules is reduced because the cellulose fiber does not have an acetoxy group. Conceivable.

Cellulose diacetate fibers are preferably used as fiber aggregates. That is, the deodorant preferably contains a fiber aggregate containing cellulose diacetate fibers. By using the cellulose diacetate fiber as an aggregate containing a plurality of fibers, a network structure of the fibers is formed, and the ability to capture odor molecules can be enhanced.

The cellulose diacetate fiber is preferably a tow open fiber. Since the tow open fiber is a long fiber, when a fiber aggregate is formed from the tow fiber assembly, the fiber is less likely to fall off and the tow fiber is excellent in durability. Further, by using the tow-open fiber, the fiber aggregate can be formed bulky to increase the porosity, and the ability to collect odor molecules can be enhanced.

The fiber aggregate may contain fibers other than cellulose diacetate fibers. For example, any other fiber may be included to include heat-sealing fibers to improve the formability of the fiber assembly, or to adjust the hydrophobicity of the fiber assembly or to impart water absorption performance. It may be included. From the viewpoint of enhancing the deodorizing effect, the fiber aggregate preferably has a cellulose diacetate fiber content of 30% by mass or more, more preferably 50% by mass or more, further preferably 70% by mass or more, and 90% by mass. % Or more is even more preferable, and 95% by mass or more is particularly preferable. The fiber aggregate may be composed only of cellulose diacetate fibers. The content of cellulose diacetate fibers in the fiber aggregate means the ratio to 100% by mass of all the fibers constituting the fiber aggregate. When the cellulose diacetate fibers are unevenly distributed in the fiber aggregate, if the cellulose diacetate fibers are formed so as to support condensed tannin, the cellulose diacetate fibers in the fiber aggregate The content may be less than 30% by mass.

Examples of the method for supporting the condensed tannin on the cellulose diacetate fiber include a method of spraying the condensed tannin and a liquid containing the condensed tannin on the cellulose diacetate fiber, and a method of immersing the cellulose diacetate fiber in the liquid containing the condensed tannin. Be done. Condensed tannin may be added to the cellulose diacetate fiber as a natural extract (for example, a juice or solvent extract). The cellulose diacetate fiber to which the liquid containing condensed tannin is added may be subjected to a drying treatment, if necessary.

The condensed tannin may be supported on the cellulose diacetate fiber when it is desired to exert a deodorizing effect. That is, the deodorant material may be formed so that condensed tannins are supported on the cellulose diacetate fibers during use. The deodorant of the present invention can remove the odor derived from urine as described in Examples, but when the deodorant comes into contact with urine, the condensed tannin comes into contact with the cellulose diacetate fiber. It may be. In this case, for example, the deodorant can be formed by arranging the condensed tannin through the liquid permeable sheet so as not to come into direct contact with the cellulose diacetate fibers. Then, when urine is added to the deodorant, condensed tannin permeates the liquid-permeable sheet together with urine and migrates to the surface of the cellulose diacetate fiber, and as a result, the condensed tannin is supported on the cellulose diacetate fiber. And the deodorant effect comes to be exhibited.

The blending amount of the condensed tannin and the cellulose diacetate fiber may be appropriately adjusted according to the desired deodorizing effect. In addition, since condensed tannin does not exist as a single compound but exists in various forms in natural products, it is actually difficult to determine the blending amount of condensed tannin itself. Therefore, it is convenient to determine the blending amount of condensed tannin as the dry mass of the natural extract (in the case of the natural extract, the mass of the evaporation residue). In this case, the blending amount of the condensed tannin is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, and further preferably 1 part by mass or more with respect to 100 parts by mass of the cellulose diacetate fiber. It is preferable, 50 parts by mass or less is preferable, 30 parts by mass or less is more preferable, and 20 parts by mass or less is further preferable.

The deodorant material may contain other deodorant substances. In addition, any auxiliary material such as a fragrance, an antibacterial agent, a preservative, and a desiccant may be contained.

The deodorant material of the present invention is particularly effective in removing biological odors. For example, it is possible to remove odorous components such as ammonia-based, sulfur-based such as hydrogen sulfide and methyl mercaptan, organic acid-based such as lower fatty acid, and aldehyde-based, and exert a deodorizing effect even when there are multiple odorous components. Can be done.

The deodorant material of the present invention can be used in a living space such as a living room or a toilet, installed in a filter of an air purifier or an air conditioner, placed near garbage or food residue, or a waste container for them. It can be installed and used inside (garbage bags and trash cans). The deodorant of the present invention can also be used as a part of textile products (for example, clothing, disposable diapers, sanitary products, disposable underwear, furniture, carpets, wall materials, etc.). In particular, as is clear from the results shown in the examples, the deodorant material of the present invention can effectively remove the odor derived from excrement such as urine, so that it is an absorbent article such as a disposable diaper or a sanitary product. Can be suitably applied to. The shape of the disposable diaper is not particularly limited, such as pants type, tape type, pad type (urine pad, light incontinence pad), and the like.

As a basic structure of the absorbent article, for example, an absorber is arranged between the top sheet and the back sheet. The top sheet is a sheet located on the wearer side when the absorbent article is worn, and is preferably liquid permeable. As the top sheet, a hydrophilic non-woven fabric, a plastic film having holes formed, or the like can be used. The back sheet is a sheet located on the opposite side of the wearer, that is, on the outside when the absorbent article is worn, and is preferably liquid-impermeable. As the back sheet, a hydrophobic non-woven fabric, a plastic film, a laminate of the non-woven fabric and the plastic film, or the like can be used. In the absorbent article of a special use mode, the backsheet may be liquid permeable, in which case the backsheet may be made of a material that can be used in the topsheet. The absorber is not particularly limited as long as it contains an absorbent material capable of absorbing excrement such as urine. As the absorber, for example, a molded body obtained by molding an absorbent material into a predetermined shape is used, or the absorbent material is covered or sandwiched with a sheet member such as a paper sheet (for example, tissue paper or thin paper) or a liquid-permeable non-woven fabric. You can use the non-woven fabric. Examples of the absorbent material contained in the absorber include hydrophilic fibers such as cellulose fibers (for example, crushed pulp fibers), and water absorption such as polyacrylic acid type, polyaspartic acid type, cellulose type, and starch / acrylonitrile type. Examples include sex resins.

The deodorant material of the present invention can be applied to any constituent member of an absorbent article, and removes odor not only in a place where it comes into direct contact with excrement such as urine but also in a place where it does not come into direct contact. be able to. The deodorant can be used, for example, as a constituent material of at least a part of the absorber, arranged between the top sheet and the absorber, or arranged between the back sheet and the absorber. It can also be installed on the skin side (wearer side) of the top sheet or on the outer surface side of the back sheet. The absorbent article provided with the deodorant of the present invention can effectively remove the odor derived from excrement and reduce the discomfort when the absorbent article is worn. In addition, the generation of odor can be suppressed even when the absorbent article is discarded after use.

Hereinafter, the present invention will be described in more detail by showing examples, but the scope of the present invention is not limited thereto.

(1) Deodorant test 1 (deodorant test in contact with odor source)
(1-1) Test Method 3 g of spread pulp fiber and 2 g of superabsorbent polymer powder are mixed and molded into a size of 10 cm × 10 cm, and cellulose diacetate tow spread fiber is formed on the mixture via tissue paper. 0.55 g of the aggregate of the above was placed to form a complex. An absorber was prepared by sandwiching this composite between a film arranged on the lower side and an air-through non-woven fabric arranged on the upper side, and adhering the peripheral edges of the film and the air-through non-woven fabric with a hot melt adhesive. From the top of the absorber (air-through non-woven fabric side), 0.6 g of Pancil® FG-22 (persimmon tannin solution) manufactured by Release Science Co., Ltd. diluted 2.5 times with purified water was sprayed as persimmon tannin. , An absorber containing persimmon tannin (a deodorant-containing absorber) was prepared by drying at room temperature for 1 hour. 45 mL of mixed urine (mixture of urine of a plurality of people) was added from above the absorber thus prepared (air-through non-woven fabric side), placed in a 28 cm × 40 cm zipper bag, and sealed. After 10 minutes, 1 hour, 3 hours, and 6 hours after sealing, the zipper bag was smelled and an odor confirmation test was conducted.

Also, instead of the aggregate of cellulose diacetate fibers, an aggregate of cellulose triacetate fibers, an aggregate of pulp fibers, an aggregate of cotton fibers, an aggregate of composite fibers of rayon and PET, polypropylene (PP) and polyethylene (PE). ), An absorber containing kakitannin was prepared using the aggregate of the composite fibers of), and an absorber containing no kakitannin was also prepared by spraying 0.6 g of purified water instead of spraying 0.6 g of the kakitannin solution. did. The odor confirmation test was also performed on these absorbers in the same manner as described above.

(1-2) Judgment method Each of the five evaluators judged the odor intensity based on the following judgment criteria, and the average value was used as the judgment result.
0: Odorless 1: Smell that can be finally detected 2: Smell that can be easily perceived 3: Smell that can be easily perceived 4: Strong odor 5: Strong odor

(1-3) Results Table 1 shows the results of deodorant test 1. As shown in Table 1, the absorber provided with the deodorant containing persimmon tannin and cellulose diacetate fiber maintained a substantially odorless state for 6 hours (No. 1). On the other hand, when fibers other than cellulose diacetate fibers were used, the deodorizing effect was significantly reduced after 6 hours even if persimmon tannin was contained (No. 2 to 6). Furthermore, in the absorber containing no persimmon tannin, the absorber containing cellulose diacetate fiber showed a slight deodorizing effect up to 3 hours, but the deodorizing effect was significantly reduced after 6 hours (No. 7). ). As a result, the deodorizing effect was further reduced in the absorber containing other fibers (No. 8 to 12).

(2) Deodorant test 2 (deodorant test in a non-contact state with an odor source)
(2-1) Test method 2.6 g of Pancil® FG-22 manufactured by Release Science Co., Ltd. was sprayed as persimmon tannin on 0.5 g of the tow-spread fiber aggregate of cellulose diacetate fiber to erase it. An odor material was prepared. This deodorant was placed in a 250 mL PET bottle, and the PET bottle was placed in a zipper bag having a size of 17 cm × 24 cm in an opened state and sealed (bag 1). On the other hand, 100 mL of mixed urine was placed in another PET bottle having a capacity of 250 mL, and this PET bottle was placed in a zipper bag having a size of 17 cm × 24 cm in an opened state and sealed (bag 2). Bag 1 and bag 2 were placed in a zipper bag having a size of 28 cm × 40 cm and sealed (bag 3). While maintaining the sealed state of the bag 3 and the bag 1, only the bag 2 containing urine was opened and stored in a constant temperature bath at 40 ° C. for 3 hours. Next, while maintaining the sealed state of the bag 3, the seal of the bag 2 containing urine is closed, the bag 1 containing the deodorant is opened, stored in a constant temperature bath at 40 ° C. for 1 hour, and then the constant temperature bath. The bag 3 was taken out from the bag 3 and the inside of the bag 3 was smelled, and an odor confirmation test was conducted.

Further, instead of the aggregate of cellulose diacetate fibers, a deodorant containing kakitannin using an aggregate of cellulose triacetate fibers, an aggregate of pulp fibers, and an aggregate of composite fibers of polypropylene (PP) and polyethylene (PE) is used. A material was also prepared, and an odor confirmation test was conducted in the same manner as described above. As a blank, the odor confirmation test was conducted in the same manner as described above by putting only the bag 2 containing urine in the bag 3 without putting the bag 1 containing the deodorant material.

(2-2) Judgment method Each of the five evaluators judged the odor intensity based on the following judgment criteria, and the average value was used as the judgment result.
0: Odorless 1: Smell that can be finally detected 2: Smell that can be easily perceived 3: Smell that can be easily perceived 4: Strong odor 5: Strong odor

(2-3) Results Table 2 shows the results of the deodorant test 2. As shown in Table 2, it was clarified that when a deodorant containing persimmon tannin and cellulose diacetate fiber was used, the gaseous odorous component could be removed even when the deodorant was not in contact with urine. (No. 13). On the other hand, in the deodorant material containing other fibers, the odor determination result was almost the same as that of the blank system in which the deodorant material was not installed, and the deodorant effect was not shown (No. 14 to 17).

(3) Deodorant test 3 (deodorant test in contact with odor source)
(3-1) Test Method An absorber was prepared by mixing 0.3 g of spread pulp fiber and 0.2 g of superabsorbent polymer powder. Separately, Pancil® FG-22 (Kakitannin solution) manufactured by Release Science Co., Ltd., which was diluted 2.5 times with purified water as kakitannin in 0.05 g of an aggregate of cellulose diacetate tow spread fibers. 0.06 g was sprayed and dried at room temperature to prepare a deodorant. The absorber and deodorant thus prepared were placed in the same vial, and 4.7 mL of mixed urine was further added thereto and sealed to prepare Sample A. Further, for sample A, sample B in which persimmon tannin is directly sprayed on the absorber without using an aggregate of cellulose diacetate fibers and an aggregate of cellulose diacetate fibers in which persimmon tannin is not sprayed are used as a deodorant. Sample C and sample D to which neither the aggregate of cellulose diacetate fibers nor persimmon tannin were added were prepared. After allowing each sample to stand for 3 hours and 6 hours, the gas in the vial was collected and examined by gas chromatograph mass spectrometer (GC-MS) for the presence or absence of methyl mercaptan.

(3-2) Results Table 3 shows the results of the deodorant test 3. As shown in Table 3, no detection peak of methyl mercaptan was confirmed in sample A after 3 hours and 6 hours (indistinguishable from baseline). On the other hand, in Samples B to D, the detection peak of methyl mercaptan was confirmed both after 3 hours and after 6 hours. It can be seen that the combined use of persimmon tannin and cellulose diacetate fiber completely suppressed the generation of methyl mercaptan.

Claims (4)

A deodorant material containing a fiber aggregate containing cellulose diacetate fiber , which is a tow-open fiber, and condensed tannin. The deodorant according to claim 1, wherein the condensed tannin is derived from persimmon astringent. The deodorant according to claim 1 or 2, wherein the content of the cellulose diacetate fiber in the fiber aggregate is 50% by mass or more . An absorbent article comprising the deodorant according to any one of claims 1 to 3.