JP2006181334A - Wet-type wiping article having antibacterial property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the continuation of an antibacterial property in an object to be wiped. <P>SOLUTION: Medical liquid containing polyalkoxy quaternary ammonium salt, benzalkonium chloride, ethanol, propylene glycol and water is contained in a non-woven fabric having projecting and recessed parts 2, 3 on the surface to obtain the wet-type wiping article having antibacterial property. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wet-type wiping article having antibacterial properties, such as a wet tissue, a body or butt wipe, a disposable towel, and a cleaning sheet.

  Conventionally, wet-type wipes have been proposed in which a chemical solution containing antibacterial components such as alcohol, paraoxybenzoic acid ester, and quaternary ammonium salt of a monomer is contained in a substrate made of a fiber assembly such as a nonwoven fabric (patent) References 1 and 2).

  In such wet type wiping products having antibacterial properties, the antibacterial agent applied to the wiping target is taken together with the action of taking bacteria and the like adhering to the wiping target into the base material and sterilizing and decomposing by the antibacterial component held in the base material. The effect | action which provides an antibacterial effect to the surface to be wiped off with a component is show | played.

However, the conventional product has a problem that the antibacterial effect on the surface to be wiped is lost unexpectedly quickly.
JP 2004-529148 A JP 2004-188091 A

  Then, the main subject of this invention is to improve the sustainability of the antibacterial effect in the wiping target.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A wet-type wipe having antibacterial properties, characterized in that a chemical solution containing a polyalkoxy quaternary ammonium salt is contained in a substrate made of a fiber assembly.

(Function and effect)
At first, there were various causes for the non-sustaining antibacterial effect, but as the research progressed, the conventional antibacterial components were highly volatile and would volatilize directly when applied to a wipe. Was found to be the main cause. The present invention is based on such knowledge, and as an antibacterial component, a polyalkoxy quaternary ammonium salt having a large molecular weight and hardly volatilized is contained, so that the antibacterial component is retained on the object to be wiped for a longer time. As a result, the antibacterial effect will last much longer than before.

<Invention of Claim 2>
The wet-type wipe having antibacterial properties according to claim 1, wherein the content of the polyalkoxy quaternary ammonium salt in the chemical is 0.01 to 0.5% by weight.

(Function and effect)
If the content of the polyalkoxy quaternary ammonium salt in the chemical solution is less than 0.01% by weight, the antibacterial effect will be insufficient, and if it exceeds 0.5% by weight, there will be no significant change in the antibacterial effect and its sustainability. The effectiveness is worse. Therefore, the content described in this section is preferable.

<Invention of Claim 3>
The wet type wiping article having antibacterial properties according to claim 1 or 2, wherein the chemical solution contains alcohol.

(Function and effect)
When the polyalkoxy quaternary ammonium salt which is a characteristic component of the present invention is used together with alcohol, the antibacterial effect is particularly sustained.

<Invention of Claim 4>
The wet type wiping article having antibacterial properties according to any one of claims 1 to 3, wherein the chemical liquid contains glycol.

(Function and effect)
When the polyalkoxy quaternary ammonium salt which is a characteristic component of the present invention is used together with glycol, the antibacterial effect is particularly sustained.

<Invention of Claim 5>
The wet type wiping article having antibacterial properties according to any one of claims 1 to 4, wherein a number of irregularities are formed on the surface of the substrate.

(Function and effect)
In a wet type wiping product, after wiping, the chemical solution forms a film and adheres to the surface to be wiped. At this time, if the unevenness is formed by dirt adhering to the target surface, the chemical solution is likely to volatilize because the liquid film in the uneven portion becomes thin.

  In contrast, in the present invention, a large number of irregularities are formed on the surface of the base material. Such a base material has an effect of scraping dirt by the convex portion and pushing it into the concave portion. Therefore, by adopting such a base material in the present invention, it becomes difficult for unevenness of dirt to remain on the surface to be wiped and the liquid film becomes uniform, so that the volatilization of the chemical solution can be suppressed.

<Invention of Claim 6>
The antibacterial property according to any one of claims 1 to 5, wherein a plurality of convex portions having a relatively high fiber density and concave portions having a relatively low fiber density are formed on the surface of the base material. Wet type wipes.

(Function and effect)
As described in this section, when the fiber density of the convex portion is relatively increased, the rigidity of the convex portion is increased, thereby improving the scraping ability. Moreover, by making the concave fiber density low, dirt is easily taken in between the fibers, and the dirt accommodation capacity is improved. Therefore, according to the invention described in this section, the wiping performance is significantly improved as compared with the case where the substrate is simply provided with unevenness, and the volatilization of the chemical solution can be more effectively suppressed.

  As described above, according to the present invention, the antibacterial effect on the object to be wiped is significantly maintained.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
<About the base material>
The base material that can be used in the wiping article of the present invention is not particularly limited as long as it is made of a fiber assembly, and paper, non-woven fabric, woven fabric, etc. can be used, and it has water decomposability. In addition to those not present, those having water decomposability can also be used.

  The fiber constituting the substrate can be used regardless of natural, regenerated, or synthesized. In the present invention, fibers containing at least hydrophilic fibers are preferable. Examples of hydrophilic fibers that can be used include natural fibers such as cotton and pulp, and regenerated fibers such as rayon and cupra. Among these fibers, rayon is particularly preferable. Rayon is rich in water absorption and is easy to handle, and a certain length of fiber can be obtained at low cost. Such hydrophilic fibers are desirably blended in the substrate at a content ratio of 50 to 70% by weight. When the content of the hydrophilic fiber is less than 50% by weight, sufficient flexibility and water retention cannot be given, and when it exceeds 70% by weight, the strength when wet is too low, and the tearing is caused. In addition to being easily generated, it becomes excessively stretched when taken out from the container in a pop-up manner.

  In the base material of the present invention, in addition to the above hydrophilic fibers, heat-fusible fibers can be used to bond the fibers together. As the heat-fusible fiber, any fiber that melts by heating and exhibits adhesiveness to each other can be used. This heat-fusible fiber may be a single fiber or a composite fiber in which two or more synthetic resins are combined. Specifically, polyolefin-based single fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polypropylene / polyethylene, polyethylene terephthalate-ethylene / propylene copolymer, low melting point polyester-polyester, etc. A core-sheath type composite fiber or an eccentric core-sheath type composite fiber whose sheath part is made of a relatively low melting point, or a part of each component made of polyethylene terephthalate / polypropylene, polyethylene terephthalate / nylon, polypropylene / polyethylene is the surface Splitting by heat shrinkage of one component consisting of split type composite fiber or polyethylene terephthalate / ethylene-propylene copolymer exposed in Or the like can be used composite fibers. In this case, a core-sheath type composite fiber is preferable when productivity and dimensional stability are important, and an eccentric type composite fiber is preferable when importance is placed on volume. In addition, if importance is attached to flexibility, when a split type composite fiber or a heat split type composite fiber is used, each component can be easily divided into ultrafine fibers by high-pressure water flow treatment. Such heat-fusible fibers are desirably blended at a content ratio of 10 to 30% by weight. When the heat-fusible fiber is less than 10% by weight, the wet strength cannot be secured, and the elongation becomes too large when the pop-up type is taken out from the container. On the other hand, when it exceeds 30% by weight, the texture becomes hard and the feel is rough, which is not preferable for this type of wet tissue.

  Moreover, in the base material of this invention, a thermoplastic synthetic fiber other than a hydrophilic fiber and a heat-fusible fiber can be mixed. As the thermoplastic fiber, various synthetic fibers exist, and among them, a polyester fiber is preferable. Polyolefin fibers such as polyethylene and polypropylene have poor confounding properties when subjected to high-pressure water flow treatment, and become inferior in fluffing and wet strength. Also, polyamide fibers such as nylon are hydrophilic and are not preferred. The mixing amount of the thermoplastic fibers is preferably 40% by weight or less. When the content of the thermoplastic fiber exceeds 40% by weight, the water retention is impaired and the wet performance is remarkably lowered. By mixing thermoplastic fibers, the stiffness when wet is improved and a bulky nonwoven fabric can be obtained. Moreover, when a part is exposed to the nonwoven fabric surface, a sticky feeling is relieved even when wet due to hydrophobicity, and a dry feel is imparted.

  Desirably, the thermoplastic fiber has thermal crimpability. In order to impart heat crimpability, a form of side-by-side type composite fiber in which synthetic resins having different heat shrinkage temperatures are bonded to thermoplastic fibers is adopted. For example, the melting point of the polyester fiber is 255 ° C. for polyethylene terephthalate and 215 ° C. for polybutylene terephthalate. As the low melting point resin to be bonded to this, a resin substantially the same as the melting point temperature of the above-mentioned heat-fusible fiber is used. It is better to do so.

In the present invention, there is no particular limitation on the shape of the base material, and it may have a thick block shape in addition to the sheet shape. In the case of a sheet-like substrate, the basis weight of the substrate is preferably ²⁰ to 80 g / m ² , particularly about 30 to 60 g / m ² . When the basis weight of the base material is less than 30 g / m ² , the ability to retain dirt becomes poor and it becomes difficult to provide unevenness as described later, and when it exceeds 60 g / m ² , the flexibility becomes poor.

  On the other hand, the substrate 1 may have a flat surface, but in order to make the antibacterial effect of the present invention more durable, as shown in FIGS. It is preferable to form the irregularities 2 and 3. In this case, the dirt scraping effect is improved by the convex portion 2, and the dirt accommodation effect is improved by the concave portion 3. As a result, the effect of removing dirt on the surface to be wiped is improved, and the unevenness of the dirt becomes difficult to remain, so that the promotion of volatilization is suppressed. FIG. 1 shows an example in which irregularities are formed on both surfaces of the substrate 1, and FIG. 2 shows an example in which irregularities are formed on one surface of the substrate 1.

  As shown in FIG. 1 and FIG. 2, a particularly preferable form is that the surface of the base material 1 has convex portions 2, 2... Having relatively high fiber density and concave portions 3, 3. Many are formed. In this case, the scraping ability is improved by increasing the rigidity of the convex portion 2, and the dirt accommodation capability is improved by widening the fiber gap of the concave portion 3. Moreover, since the base material 1 having such irregularities includes the partial convex portions 2 having a high fiber density and the partial concave portions 3 having a low fiber density, the base material 1 is structurally easy to bend in the concave portions 3 having a low fiber density. In addition, moderate softness is imparted, and an appropriate texture is imparted by the uneven pattern on the surface.

  More specifically, in the base material 1 in the illustrated example, the ridges 2, 2... Are formed with a relatively high fiber density and a linear shape, and are formed with a relatively low fiber density and a linear shape. The recessed ridges 3, 3, ... are present alternately. The irregularities are preferably formed alternately as in the illustrated example, but the present invention is not limited to this and can be irregularly formed. Moreover, although the unevenness is preferably formed in a strip shape as in the illustrated example, it can also be formed in a dot shape.

  As shown in the example shown in FIG. 3, when the strip-shaped unevenness is formed in parallel and alternately, the wiping effect by the convex portion and the accommodating effect by the concave portion are not exhibited at the time of wiping in the extending direction. Therefore, as shown in FIG. 4, the linear pattern formed by the ridges 2 and the recesses 3 intersects the linear pattern formed by the other ridges 2 and the recesses 3. It is preferable to present an intersecting pattern (in the illustrated example, a herringbone pattern). In this case, no matter which direction is wiped, dirt is pushed into the recess 3 due to the presence of the protrusion 2, and finally the dirt is scooped by the protrusion 2, so that it is beautiful. Can be wiped off.

  As the cross pattern of the linear pattern formed by the ridge portion 2 and the concave stripe portion 3, it is sufficient that the linear pattern intersects with other linear patterns. Various patterns such as a rhombus pattern can be used. It is desirable that the number of lines of the linear pattern formed by the ridges 2 and the recesses 3 is 3 to 9 / cm. When the number of lines is less than 3 / cm, the non-woven fabric becomes almost flat, so that once captured, the dirt is easily transferred, and when the number of lines exceeds 9 / cm, the protrusion 2 Since the volume of the space formed by the groove portion 3 becomes too small, a desired amount of dirt cannot be secured in the groove portion 3, which is not desirable.

  Moreover, as FIG.1 and FIG.2 shows, the height (thickness) Hm from the back surface of the protruding item | line part 2 is 300-800 micrometers, Preferably it is 450-650 micrometers, The height from the back surface of the recessed item part 3 ( Thickness Hd is 100 to 500 μm, preferably 200 to 400 μm. From another viewpoint, it is desirable that the height difference between the ridges 2 and the ridges 3 is 50 to 300 μm, preferably about 75 to 150 μm. When the height difference is less than 50 μm, a large amount of capturing effect by the concave strip portion 3 cannot be expected and a desired wiping amount cannot be secured. In addition, when the height difference exceeds 300 μm, the thickness of the base material increases as a result, and the flexibility and the touch feeling are impaired.

  On the other hand, the base material 1 having the unevenness described above can be manufactured, for example, as follows. That is, a fiber web comprising a hydrophilic fiber such as rayon, a heat-fusible fiber such as polyethylene or polypropylene, and a thermoplastic fiber such as polyester fiber on a wire mesh having a desired surface irregularity pattern to be applied to the substrate. And a high-pressure water stream is jetted from above the fiber web during conveyance so that the fibers are entangled. At this time, the fiber in the portion of the wire mesh where the wire is present is pushed to the both sides of the wire by the collision energy of the high-pressure water stream and moved to the opening side, so that the fiber portion of the mesh opening portion has a relatively high fiber density. While becoming higher, it becomes convex according to the shape of the opening, while the portion where the wire is present has a relatively low fiber density and a concave shape is formed along the wire.

  The fibers are entangled with each other by the high-pressure water flow, and the entire fiber web is integrated. Thereafter, heat treatment is performed on the integrated fiber web at a temperature close to the melting point of the heat-fusible fiber, the fibers are bonded to each other by melting the heat-fusible fiber, and the thermoplastic fiber has heat crimpability. Bulkiness is provided by crimping.

  The above manufacturing method is an application of the spunlace method. However, other methods such as a chamber method, a dry method, a spunbond method, a melt blow method, a needle punch method, and a stitch bond method are used. Needless to say, it can be applied to the production of the substrate of the present invention as long as it can be formed.

<About chemicals>
The chemical solution of the present invention is not particularly limited as long as it contains a polyalkoxy quaternary ammonium salt. As the polyalkoxy quaternary ammonium salt, for example, polyoxyethylene alkylamine, polyoxyethylene laurylamine, polyoxyethylene stearylamine and the like can be used. The content of the polyalkoxy quaternary ammonium salt in the chemical solution can be determined as appropriate, but is preferably 0.01 to 0.5% by weight. If the content of the polyalkoxy quaternary ammonium salt is less than 0.01% by weight, the antibacterial effect becomes insufficient, and if it exceeds 0.5% by weight, there is no significant change in the antibacterial effect and its sustainability, which is cost-effective. Getting worse. In addition, it cannot be overemphasized that the amount of each component in a chemical | medical solution can be determined by the addition amount or the component quantitative analysis of the chemical | medical solution squeezed from the product base material.

  In order to improve the durability of the antibacterial effect, at least one of alcohol and glycol can be added to the chemical solution of the present invention. As the alcohol, for example, ethanol, propanol, butanol, isopropanol and the like can be used. Moreover, as glycol, propylene glycol, dipropylene glycol, 1, 3- butylene glycol, etc. can be used. It is particularly preferable to use a combination of alcohol and glycol. The content of the alcohol in the chemical solution can be appropriately determined, but is preferably 15 to 70% by weight, particularly preferably 30 to 70% by weight. If the alcohol content is less than 30% by weight, the effect of improving the antibacterial sustainability is insufficient, and if it exceeds 70% by weight, there is no significant change in the improvement of the antibacterial sustainability and the cost effectiveness deteriorates. Moreover, although content of the glycol in a chemical | medical solution can be determined suitably, it is preferable to set it as 0.5 to 5 weight%, especially 0.5 to 3 weight%. If the glycol content is less than 0.5% by weight, the effect of improving the antibacterial durability is insufficient, and if it exceeds 3% by weight, there is no significant change in the improvement of the antibacterial durability and the cost effectiveness is deteriorated.

  In the chemical | medical solution of this invention, other antimicrobial components other than a polyalkoxy quaternary ammonium salt can be contained. Examples of other antibacterial components include benzalkonium chloride, cetylbilidinium chloride, phenoxyethanol, chlorohexidine gluconate, lauryl sulfate, and the like. The content of other antibacterial components in the chemical solution may be appropriately determined according to the medicinal effect, but is usually preferably 0.01 to 0.3% by weight. When the content is less than 0.01% by weight, the antibacterial effect becomes insufficient, and when it exceeds 0.3% by weight, the antibacterial effect and its sustainability are not significantly changed, and the cost effectiveness is deteriorated.

  Although it does not specifically limit as a solvent used for the chemical | medical solution of this invention, Water is suitable.

  In addition to the above, the chemical solution of the present invention may contain trace components such as humectants such as aloe extract, preservatives such as methylparaben, ethylparaben and propylparaben.

  On the other hand, although content with respect to the base material of the chemical | medical solution of this invention can be determined suitably, in the case of a nonwoven fabric base material, it is suitable to set it as about 200 to 400% with respect to the absolute dry weight of a base material. If the content with respect to the substrate is less than 200%, the liquid content is small and dirt is difficult to remove, and if it exceeds 400%, the surface to be wiped becomes difficult to dry.

(Experiment 1)
Example 1 (chemical solution composition: propylene glycol 1% by weight, surfactant 0.2% by weight), Example 2 (chemical solution composition: ethanol 50% by weight, propylene glycol 1% by weight, surfactant 0. 2% by weight) and a commercial product ("Alcohol towel that can be sterilized by Eliere" manufactured by Daio Paper Co., Ltd.), chemical composition: ethanol 50% by weight, propylene glycol 1% by weight, benzalkonium chloride 0.05% by weight, Aloe extract (0.02% by weight) was prepared, and the durability of the antibacterial effect was evaluated. In the test, Escherichia coli (serotype O-157: H7 verotoxin I and II production strains) was used as the bacterial species, and a standard agar medium was used as the medium. In preparing the bacterial solution, the strain was cultured in a standard agar medium at 35 ° C. for 18 to 24 hours, and then the bacterial cells were suspended in sterile physiological saline and adjusted to 10 ⁷ / ml to obtain a bacterial solution. When preparing the test piece, use a sterilized petri dish as an unprocessed test piece, and apply 0.1 ml of the chemical solution squeezed from the wiping article of Example or a commercial product to the inner surface of the sterilized petri dish using a pipette. An antibacterial processed test piece was used. When inoculating the test bacterial solution, the petri dish lid was closed and the inside was dried, and the bacterial solution was 0 immediately, 1 hour, 2 hours, 4 hours, 6 hours, 8 hours, 12 hours later. .05 ml was dropped and stirred for 5 minutes, and the number of viable bacteria after stirring was measured at each elapsed time. In measuring the number of viable bacteria, 10 ml of sterile physiological saline was added to a petri dish, and the surviving bacteria were extracted by shaking. The number of viable bacteria per ml of this extract was cultured and measured using a standard agar medium. The same experiment was performed for Staphylococcus aureus and Salmonella. The experimental results are shown in Table 1.

  As is clear from these results, the sustainability of the antibacterial effect of Examples 1 and 2 was superior to that of a commercially available product. In addition, Example 2 was superior in immediate effect than the others.

(Experiment 2)
Non-woven fabric having an uneven surface of a herringbone pattern (number of lines: 6 / cm, height (thickness) Hm: 500 μm from the back of the ridge, height (thickness) Hd: 300 μm from the back of the ridge) 1% by weight of propylene glycol, 50% by weight of ethanol, 0.05% by weight of benzalkonium chloride, 0.04% by weight of polyoxyethylene alkylamine, and 48.1% of water and trace components Example 4 was prepared in the same manner as in Example 3 except that it was changed to a flat nonwoven fabric base material having no irregularities on the surface, and evaluated for sustainability of the sterilization effect. It was found that Example 3 was superior to Example 4 in sustainability.

  The present invention can be used without any limitation in shape and use as long as it is a wet type wipe, such as a wet tissue, a body or butt wipe, a disposable towel, or a cleaning sheet.

It is sectional drawing of the base material which has an unevenness | corrugation. It is sectional drawing of another base material. It is a perspective view of another base material. It is a top view of another base material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Convex part, 3 ... Concave part.

Claims (6)

  A wet-type wipe having antibacterial properties, characterized in that a chemical solution containing a polyalkoxy quaternary ammonium salt is contained in a substrate made of a fiber assembly.   The wet-type wipe having antibacterial properties according to claim 1, wherein the content of the polyalkoxy quaternary ammonium salt in the chemical is 0.01 to 0.5% by weight.   The wet type wiping article having antibacterial properties according to claim 1 or 2, wherein the chemical solution contains alcohol.   The wet type wiping article having antibacterial properties according to any one of claims 1 to 3, wherein the chemical liquid contains glycol.   The wet type wiping article having antibacterial properties according to any one of claims 1 to 4, wherein a number of irregularities are formed on the surface of the substrate.   The antibacterial property according to any one of claims 1 to 5, wherein a plurality of convex portions having a relatively high fiber density and concave portions having a relatively low fiber density are formed on the surface of the base material. Wet type wipes.

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