JPH10310935A - Antimicrobial fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce antimicrobial fibers or products thereof having extremely low toxicity, excellent antimicrobial properties and their durability and capable of being suitably used for medical everyday goods, general clothing, beddings and accessories and filter materials and provide its production. SOLUTION: The antimicrobial fibers contain 0.005-10 wt.% of ε-poly-L-lysine or its salt and 0.05-10 wt.% of dispersant comprising a metal salt of a 12-20 C higher fatty acid. The fibers consist of a single component or are conjugate fibers comprising >=2 components containing different concentration of ε-poly-L- lysine or its salt and ε-poly-L-lysine or its salt is included as itself or mixed with or included in a material difficultly soluble in water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an antibacterial fiber. More specifically, ε-poly-L-
The present invention relates to an antibacterial fiber containing lysine and / or ε-poly-L-lysine salt and a dispersant. More specifically, the present invention relates to an antibacterial fiber which is suitable for use as a medical hygiene material, a living-related material, a general clothing material, a bedding material, a filter material, and the like, and has a long-lasting antibacterial property.

[0002]

2. Description of the Related Art In our living space, various bacteria and fungi are present. In particular, in a high-temperature and high-humidity environment such as in Japan, bacteria and fungi easily grow on the surface of textile products such as sanitary materials and clothes. As a result, skin damage is caused, and further, the fiber is degraded, discolored, deteriorated, or gives off odor and gives discomfort. In particular, since synthetic fibers are less likely to absorb sweat, when the fibers are worn, microorganisms tend to propagate easily due to the attachment of sweat. In addition, the development of comfortable and hygienic antibacterial textile products is desired because of the occurrence of food poisoning due to the proliferation of bacteria in textile products such as cloths and water filtration materials, and the rapid increase of MRSA infection patients due to hospital-acquired infections. I was

[0003] From this point of view, organotin and organomercury compounds have been used to impart antibacterial properties to fibers, but at present, most of such compounds are used due to their toxicity. It is banned.

[0004] As an alternative, there is a method in which a highly safe silicone quaternary ammonium salt is applied to textiles such as carpets. However, silicone quaternary ammonium salts are reactive with cellulose fibers and exhibit antibacterial properties with washing resistance, but synthetic fibers have only a temporary antibacterial effect.

It has long been known that compounds such as silver, copper and zinc have antibacterial properties.
Many attempts have been made to add zinc into a polymer to impart antibacterial properties, for example, Japanese Patent Application Laid-Open No. 54-147220. An attempt to add zeolite-based solid particles ion-exchanged with silver ions and copper ions to a polymer has been proposed in, for example, JP-A-59-133235.

However, in these methods, the fiber is discolored by the metal compound. In addition, the fibers and fiber products obtained by these methods may pose a problem in hygiene to the human body, particularly to infants with weak skin, depending on the intended use.

In recent years, attempts have been made to apply chitin and chitosan derivatives having low toxicity to the human body and high safety to textiles as antibacterial agents. For example, JP-A-5-5274 proposes an antibacterial short-fiber nonwoven fabric in which a composite comprising a deacetylated product of chitin and cellulose fine powder is fixed. In these fiber products, high antibacterial properties and durability are realized. However, since cellulose exhibits hydrophilicity, only a hydrophilic nonwoven fabric can be obtained, and thus its use is limited.

[0008] On the other hand, ε-poly-L-lysine is an antibacterial agent obtained by separating and collecting from a culture of a bacterium such as Streptomyces alplus subsp. Lysinopolymeras, and has an effect on the human body. Extremely low,
It is known to be an extremely safe antibacterial agent.
For this reason, ε-poly-L-lysine is also approved for use as a food preservative. Also, since ε-poly-L-lysine is water-soluble, it has a feature that an antibacterial effect appears in a short time, and it has a large molecular weight, excellent volatility, and excellent heat stability. It has unprecedented superior properties such that it can be kneaded into an antibacterial resin product.

However, since ε-poly-L-lysine has poor compatibility with many thermoplastic resins, even if it is kneaded into the thermoplastic fibers at the time of spinning, secondary coagulation occurs in the resin when the added amount is large. Cause problems in spinnability,
The resulting fibers may also have reduced fiber strength due to the secondary aggregation of ε-poly-L-lysine. Also, ε-poly-L
-Since lysine is difficult to disperse uniformly in the fiber resin, sufficient antibacterial effect cannot be obtained as expected from the antibacterial property of the original ε-poly-L-lysine, or the immediate effect of the antibacterial effect is poor. There is.

Japanese Patent Application Laid-Open No. 8-170217 discloses that ε-poly-
Although an antibacterial fiber containing L-lysine is disclosed, the antibacterial fiber disclosed therein leaves much room for improvement, particularly for various problems including the above problems. There is a need for antibacterial fibers having even better antibacterial properties, spinnability, fiber appearance, fiber strength and washing resistance.

[0011]

DISCLOSURE OF THE INVENTION The present invention relates to medical hygiene materials, living-related materials, which have extremely low toxicity to the human body, have excellent antibacterial properties, and have a long-lasting antibacterial property.
An object of the present invention is to provide an antibacterial fiber and an antibacterial fiber product that can be suitably used as a general clothing material, a bedding material, and a filter material.

The present inventors have conducted intensive studies in order to achieve the above object, and as a result, have found that fibers made of thermoplastic resin (hereinafter collectively referred to as thermoplastic fibers) have ε-poly-L.
-Free lysine or ε-poly-L-lysine salt (hereinafter collectively referred to as ε-poly-L-lysine) and a dispersant are added and used in combination to form a resin. The dispersion characteristics of ε-poly-L-lysine are improved, and as a result, not only the appearance of the resulting fiber is excellent, but also the ε-poly-L-lysine has a higher ε-poly-L-lysine than thermoplastic fiber alone.
It has been found that poly-L-lysine can be easily eluted, fibers having excellent antibacterial properties can be obtained at a low added concentration, and that the antibacterial effect can be maintained after washing. Further, by devising a method for containing ε-poly-L-lysine,
A method for expressing antibacterial properties over a long period with a smaller amount of ε-poly-L-lysine was also found. The present invention has been completed based on these findings.

[0013]

The present invention has the following arrangement to solve the above-mentioned problems. (1) A fiber made of a thermoplastic resin, wherein 0.005 to 10% by weight of ε-poly-L-lysine and / or ε-poly-L- An antibacterial fiber comprising a lysine salt and a dispersant comprising a metal salt of a higher fatty acid having 12 to 20 carbon atoms in an amount of 0.05 to 10% by weight in terms of the fiber weight based on the weight of the fiber. (2) The thermoplastic resin is a polyolefin resin, a thermoplastic polyester resin, a polyamide resin, a polystyrene resin, a vinyl chloride resin, a vinylidene chloride resin,
The antibacterial fiber according to the above (1), which is at least one selected from thermoplastic elastomers. (3) The above item (1) or (1) wherein the dispersant is a metal salt composed of any one of lithium, magnesium, calcium and zinc and any one of higher fatty acids of stearic acid, lauric acid and oleic acid. The antibacterial fiber according to the item 2). (4) The fiber made of a thermoplastic resin is a conjugate fiber made of at least two components of a thermoplastic resin, and ε-poly-L-lysine and / or ε-poly- contained in each component of the conjugate fiber. The antibacterial fiber according to any one of the above (1) to (3), wherein the concentration of the L-lysine salt is different. (5) ε-poly-L-lysine and / or ε-poly-L
-The antibacterial fiber according to any one of the above (1) to (4), wherein the lysine salt is mixed or contained in the poorly water-soluble substance. (6) A nonwoven fabric using the antibacterial fiber according to any one of (1) to (5). (7) A filter using the antibacterial fiber according to any one of (1) to (5).

Hereinafter, the present invention will be described in detail. As the fiber material used for the antibacterial fiber of the present invention, polypropylene, linear low-density polyethylene, low-density polyethylene,
High-density polyethylene, polyolefins such as copolymers of propylene and other α-olefins, or polyethylene terephthalate, polybutylene terephthalate,
Polyesters such as copolyesters and low melting thermoplastic polyesters, or nylon 6, nylon 66
For example, a thermoplastic resin such as a polyamide resin, such as a polyamide resin, a polystyrene resin, a vinyl chloride resin, or a thermoplastic elastomer, or a synthetic resin composed of a mixture thereof is used.

In the case where the antibacterial fiber of the present invention is a composite fiber comprising two or more thermoplastic polymers, a composite fiber such as a sheath-core type, a side-by-side type, an eccentric sheath-core type, a multilayer type or a sea-island type is used. Can be illustrated. Examples of the combination of the thermoplastic resin of the conjugate fiber include high-density polyethylene / polypropylene, linear low-density polyethylene / polypropylene, low-density polyethylene / polypropylene, a binary copolymer or a ternary copolymer of propylene and another α-olefin. Polymer / polypropylene,
Linear low density polyethylene / high density polyethylene, low density polyethylene / high density polyethylene, various polyethylene / thermoplastic polyester, polypropylene / thermoplastic polyester, low melting thermoplastic polyester / thermoplastic polyester, various polyethylene / nylon 6, polypropylene / Nylon 6, a binary copolymer or terpolymer of propylene and another α-olefin / nylon 6, nylon 6 / nylon 66, nylon 6 / thermoplastic polyester, and the like. Also, composite fibers made of the same thermoplastic resin containing different concentrations of ε-poly-L-lysine may be used.

Next, ε-poly-L-lysine used in the present invention will be described. [epsilon] -poly-L-lysine is described in, for example, JP-A-59-20359.
A lysine-producing bacterium, Streptomyces alplus subsp.
It can be obtained by culturing lysinopolymeras in a medium and separating and collecting ε-poly-L-lysine from the obtained culture.

The ε-poly-L-lysine used in the present invention may be used in the form of a free product, such as an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid and hydrobromic acid, or acetic acid, propionic acid, fumaric acid, It may be used in the form of a salt with an organic acid such as malic acid and citric acid.

Although the antibacterial effect of ε-poly-L-lysine is not substantially different between a free substance and a salt, it is possible to use a thermoplastic resin of 230%.
When melt-spinning is performed at a heating temperature of not lower than ℃, ε-poly-L-lysine salt is more preferable in terms of thermal stability. However,
If the temperature exceeds 260 ° C., the antibacterial effect is maintained, but the coloring gradually occurs. Therefore, it is desirable to set the heating temperature to 260 ° C. or lower. Conversely, when spinning is performed at a temperature lower than 230 ° C., it is preferable to use ε-poly-L-lysine free product from the viewpoint of spinnability.

Next, the dispersant used in the present invention will be described. The dispersant in the present invention is, for example, a metal salt of a higher fatty acid, such as a metal salt of ε-poly-L-lysine, when added to a thermoplastic resin in combination with ε-poly-L-lysine and compatibility or dispersion with the resin used. Refers to a substance that improves properties. Particularly effective as a dispersant having such properties are zinc stearate, zinc laurate, zinc oleate and other alkaline earth metals such as magnesium and stearic acid, lauric acid and oleic acid having 12 to 20 carbon atoms. Is a metal salt with a higher fatty acid. When these dispersants are added, the antibacterial effect, spinnability, fiber appearance and fiber strength are improved as compared with the case where ε-poly-L-lysine is added alone. In addition, although the effect as a dispersant is slightly reduced, polyolefin-based hydrocarbon compounds having a degree of polymerization of about 100 to 10000, amide-based compounds such as stearic acid amide, ethylenebisoleic acid amide, glycerol tristearate, dioctyl phthalate, and the like Ester compounds, hexyl alcohol, heptyl alcohol,
Higher alcohols such as octyl alcohol, nonyl alcohol, and decyl alcohol can also be used. The other dispersants are not particularly limited as long as they have the above-mentioned effects.

The average particle size of the ε-poly-L-lysine and the dispersant used in the present invention is preferably 5 μm or less, more preferably 2 μm or less. If the particle size exceeds 5 μm, filter clogging and breakage tend to occur during melt spinning, making it difficult to use. Particularly when considering application to medical hygiene materials, yarns having a single fiber denier of about 2 deniers are required, and if the particle diameter is large, yarn breakage and pack pressure are undesirably increased. The method for converting ε-poly-L-lysine and the dispersant into fine particles is not particularly limited, and may be pulverized with a mortar, a ball mill, or the like, or may be performed by a supercritical fluid dissolution diffusion method or pressure crystallization. A crystal generation method or the like may be used.

The method of adding ε-poly-L-lysine and a dispersant used in the present invention to a thermoplastic resin is not particularly limited. For example, a master batch in which ε-poly-L-lysine and a dispersant are added in advance to the resin at a high concentration may be prepared by mixing directly at the time of spinning, or
During spinning, it may be used by mixing with raw material pellets not containing ε-poly-L-lysine. There is no essential difference in the antibacterial effect using any of these addition methods.

The amount of ε-poly-L-lysine kneaded into the antibacterial fiber of the present invention is 0.005 to 10% by weight, preferably 0.05 to 6% by weight based on the total weight of the fiber. % By weight. The content of ε-poly-L-lysine is 0.00
If the content is less than 5% by weight, a sufficient antibacterial effect cannot be obtained, or even if it is obtained, it is difficult to maintain the antibacterial effect for a long period of time. On the other hand, if it exceeds 10% by weight, the cost is increased and the spinning stability is undesirably reduced.

On the other hand, the amount of the dispersing agent kneaded into the antibacterial fiber of the present invention is 0.05 to 0.05 in terms of a pure content based on the whole fiber weight.
It is 10% by weight, preferably 0.15 to 5% by weight.
If the amount is less than 0.05% by weight, the effect of adding the dispersant cannot be sufficiently obtained. Further, even if added in an amount of more than 10% by weight, the effect of the dispersant reaches saturation, so that not only the antibacterial effect is not improved, but also the spinning stability is undesirably lowered.

Next, ε-poly- in the antibacterial fiber of the present invention is used.
Design of the concentration distribution of L-lysine will be described. Although a sufficient antibacterial effect can be obtained even when ε-poly-L-lysine and a dispersant are uniformly contained in the antibacterial fiber of the present invention, the antibacterial fiber is used as a conjugate fiber, and different concentrations of ε- When poly-L-lysine is contained, the antibacterial effect and its persistence can be adjusted according to the form in which it is contained.

For example, the antimicrobial fiber of the present invention is a sheath-core composite fiber, and only the thermoplastic polymer of the sheath component is ε-poly-L-
If lysine and a dispersant are included, a small amount of ε-poly-L
-A fiber having an antibacterial effect is obtained with the content of lysine.
In this case, there is no kneading of ε-poly-L-lysine in the core component, so that spinning stability is improved and mechanical properties such as fiber strength are also improved. Although this fiber has a high antibacterial effect, it may be inferior in washing resistance, so that it can be suitably used for applications in fields that do not allow water to pass, such as air filters, and applications in disposable fields, such as sanitary materials. In this case, the composition ratio of the core component and the sheath component is preferably such that the ratio of the core component / the sheath component (weight ratio) is 20/80 to 80/20, and particularly 4%.
It is preferably 0/60 to 60/40. 80/2
If it exceeds 0, the sheath component is likely to break, and the productivity may decrease, and the persistence of the antibacterial effect may deteriorate. On the other hand, if it is less than 20/80, there is no point in providing a core component.

The antibacterial effect of the antibacterial fiber of the present invention is as follows. The antibacterial component (ε-poly-L-lysine or a salt thereof), which is uniformly dispersed inside the fiber during spinning, is extremely long from the surface of the fiber for a long time. Obtained by slow elution. Therefore, polypropylene, linear low-density polyethylene, low-density polyethylene, and high-compatibility are somewhat less compatible than polyamide resins such as nylon 6 and nylon 66 which have good compatibility with ε-poly-L-lysine or a salt thereof. It is better to use thermoplastic resins such as high-density polyethylene, polyolefins such as copolymers of propylene and other α-olefins, or polyesters such as polyethylene terephthalate, polybutylene terephthalate, copolymerized polyester, and low-melting thermoplastic polyester. This can be said to be a preferred embodiment from the viewpoint that ε-poly-L-lysine as an antibacterial component or a salt thereof elutes at a moderately slow rate. Further, the aspect of the combination of the thermoplastic resin for producing the conjugate fiber is a high-density polyethylene / polypropylene, a linear low-density polyethylene / polypropylene, a low-density polyethylene / polypropylene, a binary copolymer of propylene and another α-olefin, or Ternary copolymer / polypropylene, linear low density polyethylene / high density polyethylene, low density polyethylene / high density polyethylene, various polyethylene / thermoplastic polyester, polypropylene / thermoplastic polyester, low melting point thermoplastic polyester / thermoplastic polyester, etc. Is preferred.

Conversely, if the core component thermoplastic polymer contains ε-poly-L-lysine at a higher concentration than the sheath component thermoplastic polymer, the ε-poly-L-lysine added to the core side can be obtained. Since lysine bleeds out to the fiber surface over time, the antibacterial effect can be maintained for a long period of time. Although this fiber requires a large amount of ε-poly-L-lysine, it has excellent durability of the antibacterial effect and can be suitably used for applications such as a water filter. In addition, a conjugate fiber having a concentric circular structure of three or more layers and a higher concentration of ε-poly-L-lysine and a dispersant in the center layer will maintain the antibacterial effect for a longer period of time. be able to.

In order to further maintain the antibacterial effect, ε-poly-L-lysine can be mixed with or contained in a poorly water-soluble substance. ("Inclusion" as used in the present invention refers to encapsulation of ε-poly-L-lysine as a core with a poorly water-soluble substance.) As a poorly water-soluble substance usable for such a purpose, Examples thereof include polymer compounds having a large number of hydroxyl groups such as polyvinyl alcohol having a saponification degree of 70% or more, and alkaline earth metal salts such as calcium sulfite and calcium carbonate. The mixing ratio or the thickness of the poorly water-soluble substance to be included varies depending on the duration of the desired antibacterial effect, but the mixing ratio may be prepared with a standard of about 1: 1. In the case of inclusions, the thickness of the poorly water-soluble substance should be about 1 μm or less, and the particle size of the inclusions should be 5 μm or less (preferably 2 μm or less). As a method of adding such a mixture or inclusions to the thermoplastic resin, the method described above can be used.

As described above, by designing the concentration distribution of ε-poly-L-lysine to be kneaded into the antibacterial fiber,
A stronger antimicrobial effect can be obtained with the same amount of ε-poly-L-lysine, and the effect can be maintained for a long period of time.

The cross-sectional shape of the antibacterial fiber is not particularly limited. In addition to the circular cross-section, any shape such as a flat shape, a polygon having more than a triangle, a T-shape, a multilobe, an ellipse, and a hollow cross-section may be used. , And is not particularly limited. In this case, it is preferable to make the cross section such that the fiber surface area is increased, because the antibacterial effect increases.

In order to further enhance the antibacterial effect of the fiber of the present invention, an aqueous or alcoholic solution of ε-poly-L-lysine or a salt thereof may be adhered to the fiber surface. In this case, the amount of the attached ε-poly-L-lysine is preferably about 0.01 to 5% by weight in terms of the pure weight of the fiber.
If the content is less than 0.01% by weight, the antibacterial effect is weak, and if it exceeds 5% by weight, the fiber surface becomes supersaturated with a solution of ε-poly-L-lysine or a salt thereof, so that it becomes difficult to adhere any more. As a method of adhesion, a roller method, a dipping method, a spraying method, a pad drying method, or the like can be used. Adhesion may be applied in any of the spinning step, stretching step and crimping step, but usually the method of mixing and using various fiber oils in the spinning step and stretching step can achieve uniform adhesion,
It is simple and convenient.

To make the antibacterial fiber of the present invention into a nonwoven fabric,
After the antibacterial fibers are converted into short fibers, the nonwoven fabric may be formed by a carding method, a suction dryer method, a high-pressure water flow method, or the like, or may be formed directly by a spun bond method. In addition, the nonwoven fabric may be mixed with other synthetic fibers, natural fibers, regenerated fibers, semi-synthetic fibers, and the like as long as the effects of the present invention are not impaired.

[0033]

The antimicrobial fiber of the present invention has an ε-
Since poly-L-lysine and / or a salt thereof are kneaded, antibacterial properties are exhibited. With respect to the antibacterial action of ε-poly-L-lysine, fungal growth inhibitory action and E. coli (Esc
herichia coli, Staphylococcus aureus (St)
aphylococcus aureus), Pseudomonas aeruginosa,
It has a growth inhibitory effect on Gram-positive bacteria and Gram-negative bacteria such as Bacillus subtilis. Although the details of these antibacterial actions are unknown, the cationic amino group at the α-position of ε-poly-L-lysine adsorbs anionic constituents in the cell wall of the bacterium, thereby inhibiting the biosynthesis of the cell wall. Alternatively, it is presumed that the active transport of substances inside and outside the wall is blocked, so that an antibacterial action is exhibited. The antibacterial fiber of the present invention exhibits an excellent antibacterial effect.
Furthermore, many molds and bacteria existing around the body grow by sweat adsorbed on the underwear and cause odor, but the antibacterial fiber of the present invention suppresses the growth of these molds and bacteria and reduces the smell. The generation can be suppressed, and it also has deodorant and mildew-proof properties.

[0034]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto. In addition, the performance evaluation in an Example is reporting according to the following method.

Antibacterial test (measurement of difference in increase and decrease of antibacterial number) Measured according to the following method in accordance with "Processing effect evaluation test manual for antibacterial and deodorant processed products, bacteria count method" (Textile Sanitation Processing Association, 1988). . Klebsiella Newmonani [K. pneumon
iae (IFO13277)] was inoculated into a test piece (0.2 g) in an amount of 0.2 ml (approximately 6 × 10 6 cells).
⁽⁵ cells / ml) at a temperature of 37 ° C. for 18 hours. After the cultivation, the bacteria on the test piece were extracted with a phosphate buffer, the bacteria produced on the test piece were measured by the standard agar medium method, and the difference in the number of bacteria was calculated by the following formula. Unprocessed sample [A] Viable bacterial count immediately after inoculation [B] Viable bacterial count after 18 hours of culture Antibacterial processed sample [C] Viable bacterial count after 18 hours of culture Difference in increase / decrease in bacterial count = log ₁₀ (B / A) −log ₁₀ (C /
A) The difference in the increase or decrease in the number of bacteria obtained by the above equation is 1.6 as a guide.
If it is above, it will function enough as antibacterial performance. on the other hand,
When the difference in the number of bacteria increases or decreases less than 1.6, the antibacterial performance becomes insufficient and microorganisms propagate.

Spinnability: The spinnability at the time of melt spinning was evaluated by the following three grades based on the incidence of yarn breakage. ：: No breakage of yarn occurred and operability was good. Δ: One or two breaks per hour. ×: Thread breakage occurs three times or more per hour, which is a problem in operation.

Washing resistance: Evaluated according to JIS L0217-103. Use a household electric washing machine and neutral detergent 2
After washing in a 40 ° C. aqueous solution containing g / liter for 5 minutes, dehydration was performed, followed by washing with running water for 2 minutes, dehydration and drying. This was repeated three or ten times, and the antibacterial properties of each sample were evaluated by the antibacterial test.

Fiber strength: Conducted according to the method of JIS L1069. 2 randomly from each sample
Zero fibers were selected and tested under the conditions of a test length of 20 mm and a tensile speed of 20 mm / min, and the fiber strength (gf / d) was determined for each. And the average value and standard deviation were calculated | required from the data of the fiber strength of these 20 fibers.

Examples 1-3 As thermoplastic resins, MFR 16 g / 10 min (230
° C) polypropylene. A pellet was prepared by kneading 0.01% by weight of ε-poly-L-lysine hydrochloride in terms of pure content and zinc stearate at a concentration shown in Table 1 into the polypropylene. The pellet was melt-spun from a die having a hole diameter of 0.6 mm and a number of holes of 350 to obtain an undrawn yarn having a single denier of about 7.5 d / f. The obtained undrawn yarn is drawn 4.3 times at 110 ° C., subjected to mechanical crimping, and subjected to a heat treatment at 100 ° C. to suppress shrinkage.
It was cut into a predetermined length to obtain short fibers. These short fibers had a crimp count of about 15 pieces / inch, a cut length of 51 mm, and a single fiber fineness of about 2.0 denier. The obtained short fiber was made into a web by a card machine, and a nonwoven fabric having a basis weight of about 30 g / m ² was obtained using an embossing roll.

[0040]

[Table 1]

COMPARATIVE EXAMPLE 1 Except that only the hydrochloride salt of ε-poly-L-lysine was kneaded during the preparation of the pellets, and that zinc stearate was not kneaded, all were spun, stretched, nonwoven and formed in the same manner as in Example 1. A nonwoven fabric with a yarn fineness of about 2.0 denier and a basis weight of about 30 g / m ² was obtained.

Comparative Example 2 When pellets were prepared, only zinc stearate was kneaded.
- poly -L- lysine hydrochloride spun in the same manner as in Example 2 Another is that not kneaded and stretched, and a nonwoven fabric, the single yarn fineness is to obtain about 2.0 denier, basis weight of about 30 g / m ² nonwoven fabric Was.

Example 4 Except that the amount of ε-poly-L-lysine hydrochloride to be kneaded during pellet production was 3.5% by weight, spinning, stretching, non-woven, and single yarn were performed in the same manner as in Example 2. A nonwoven fabric having a fineness of about 2.0 denier and a basis weight of about 30 g / m ² was obtained.

Comparative Example 3 The same procedure as in Example 4 was repeated except that only the hydrochloride of ε-poly-L-lysine was kneaded and no zinc stearate was kneaded during the preparation of the pellets. A nonwoven fabric with a yarn fineness of about 2.0 denier and a basis weight of about 30 g / m ² was obtained.

Example 5 Polyvinyl alcohol having a saponification degree of 80% was added to ε-poly-L
-50% by weight of lysine hydrochloride was kneaded and mixed, and pulverized to prepare a powder containing the same amount of polyvinyl alcohol and ε-poly-L-lysine hydrochloride. Next, 7.0% by weight (3.5% by weight in terms of pure content of ε-poly-L-lysine hydrochloride) of polypropylene powder having an MFR of 16g / 10 minutes (230 ° C.) and 1% by weight of zinc stearate Was kneaded to produce a pellet. Except for using the pellets, spinning, drawing, and forming into a nonwoven fabric were performed in the same manner as in Example 1 to obtain a nonwoven fabric having a single yarn fineness of about 2.0 denier and a basis weight of about 30 g / m ² .

Example 6 A spinning, stretching and nonwoven fabric were produced in the same manner as in Example 2 except that zinc stearate was used instead of zinc stearate as a dispersing agent to be kneaded during pellet production. A 2.0 denier nonwoven fabric having a basis weight of about 30 g / m ² was obtained.

Example 7 Spinning, drawing, and forming into a non-woven fabric were carried out in the same manner as in Example 2 except that zinc stearate was used instead of zinc stearate as a dispersant to be kneaded during pellet production. A 2.0 denier nonwoven fabric having a basis weight of about 30 g / m ² was obtained.

Example 8 Except that magnesium stearate was used instead of zinc stearate as a dispersant kneaded during pellet production,
All were spun, drawn, and formed into a nonwoven fabric in the same manner as in Example 2, to obtain a nonwoven fabric having a single-fiber fineness of about 2.0 denier and a basis weight of about 30 g / m ² .

Example 9 A spinning, drawing and non-woven fabric were produced in the same manner as in Example 2 except that polyethylene terephthalate was used instead of polypropylene for the thermoplastic resin. A nonwoven fabric of 30 g / m ² was obtained.

Example 10 Polypropylene (MFR: 16 g / 10 min, 230 ° C.)
With a core component of 0.01% by weight of ε-poly-
Using a polyethylene pellet kneaded with L-lysine hydrochloride and 1% by weight of zinc stearate as a sheath component, a sheath-core ratio of 50 was obtained from a sheath-core type die having a pore diameter of 0.6 mm and 350 holes.
/ 50, a single core denier about 7.5 d / f, and a sheath-core composite fiber was spun. The obtained undrawn yarn is drawn 4.3 times at 110 ° C., mechanically crimped, and heated at 100 ° C. to suppress shrinkage.
And then cut into a predetermined length to obtain short fibers.
These short fibers had a crimp count of about 15 pieces / inch, a cut length of 51 mm, and a single fiber fineness of about 2.0 denier. The obtained short fiber is made into a web by a card machine, and heat-treated at 140 ° C. using a suction band dryer.
A nonwoven fabric having a basis weight of about 30 g / m ² was obtained.

Example 11 Polypropylene containing 1% by weight of ε-poly-L-lysine hydrochloride and 1% by weight of zinc stearate (MFR: 16)
g / 10 minutes, 230 ° C.) as a core component and ε-poly-L-
Spinning, drawing and non-woven fabric were carried out in the same manner as in Example 10 except that the sheath component was polyethylene kneaded with 0.01% by weight of lysine hydrochloride and 1% by weight of zinc stearate. A non-woven fabric having a denier of 0.0 and a basis weight of about 30 g / m ² was obtained.

Ε-poly-L-lysine kneading amount based on the fiber weight of the fibers obtained in Examples 1 to 11 and Comparative Examples 1 to 4,
Table 1 shows the results of the difference in the number of bacteria of the nonwoven fabric and the fiber strength.

As can be seen by comparing Examples 1 to 3 with Comparative Example 1, the fiber containing the dispersant was a fiber containing the same weight of ε-poly-L-lysine but not containing the dispersant. In comparison, the antibacterial effect before washing was much improved. Also, the washing resistance of the antibacterial effect was excellent. In addition, the fiber strength was improved, the standard deviation was reduced, and the variation was suppressed. Also, as can be seen from Comparative Example 2, the dispersant itself did not show any antibacterial effect.

As can be seen from a comparison between Example 4 and Comparative Example 3, the fiber containing the dispersant had the same weight of ε-poly-L
-Compared to fibers without lysine-containing dispersant
The spinnability was improved, and the fiber strength and washing resistance of the obtained fiber were also improved. The difference between the antibacterial properties before washing was not found because the upper limit of the increase / decrease value difference was 7.5 in this experiment.

As can be seen from the comparison between Examples 6 and 7 and Comparative Example 2, the antibacterial effect and the antibacterial effect were also higher when zinc laurate and zinc oleate were used as dispersants than when no dispersants were used. Improved washing resistance was observed.

As can be seen from a comparison between Example 10 and Comparative Example 4, improvement in the antibacterial effect was observed by adding a dispersant. In addition, the content of ε-poly-L-lysine in Example 10 was only 0.005% by weight in terms of pure content based on the total fiber weight, but the antibacterial effect before washing was ε-poly-L-lysine. Of 0.01% by weight.

When comparing Example 11 with Example 2, the antibacterial effect before washing is almost the same, but in Example 11, 1
Even after washing 0 times, the same antibacterial effect as before washing is maintained.

In addition to these examples, the same antibacterial effect is obtained when the thermoplastic resin is nylon 6 or polybutylene phthalate. Further, as a dispersant, lithium stearate, magnesium laurate,
Similar antibacterial effects have been obtained for those using magnesium oleate.

[0059]

The antibacterial fiber of the present invention has excellent antibacterial properties. Moreover, ε- used as a food preservative
Since poly-L-lysine or a salt thereof is used as an antibacterial agent, it has a very low effect on the human body during use and is very safe. For this reason, it can be used in various wide fields as an antibacterial fiber product. Moreover, since the dispersant is used, the compatibility and dispersibility of the resin used with ε-poly-L-lysine are improved compared to antibacterial fibers using only ε-poly-L-lysine. The effect, spinnability, fiber appearance, fiber strength and washing resistance are dramatically improved.

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Claims (7)

[Claims] 1. A fiber made of a thermoplastic resin, wherein 0.005 to 10% by weight of ε-poly-L-lysine and / or ε-poly- L
An antibacterial fiber comprising a lysine salt and a dispersant comprising a metal salt of a higher fatty acid having 12 to 20 carbon atoms in an amount of 0.05 to 10% by weight in terms of a pure weight based on the weight of the fiber; 2. The thermoplastic resin is a polyolefin resin,
The antibacterial fiber according to claim 1, which is at least one selected from a thermoplastic polyester resin, a polyamide resin, a polystyrene resin, a vinyl chloride resin, a vinylidene chloride resin, and a thermoplastic elastomer. 3. The dispersant is a metal salt comprising a metal selected from the group consisting of lithium, magnesium, calcium and zinc and a higher fatty acid selected from stearic acid, lauric acid and oleic acid. The antibacterial fiber according to the above. 4. The fiber comprising a thermoplastic resin is a composite fiber comprising a thermoplastic resin of at least two components, wherein ε-poly-L-lysine and / or ε-polyethylene contained in each component of the composite fiber. The antibacterial fiber according to any one of claims 1 to 3, wherein the concentration of the poly-L-lysine salt is different. 5. The antibacterial fiber according to claim 1, wherein ε-poly-L-lysine and / or ε-poly-L-lysine salt is mixed or contained in the poorly water-soluble substance. 6. A non-woven fabric using the antibacterial fiber according to claim 1. 7. A filter using the antibacterial fiber according to claim 1.