JPH07165981A - Antimicrobial resin composition and production of antimicrobial resin grain - Google Patents

Abstract

PURPOSE:To obtain the composition, containing antimicrobial amorphous calcium phosphate particles sticking to the surface of a water absorbing resin and useful as a paper diaper, a sanitary product, a drip water absorbing sheet for foods, a dew condensation preventing material, a sheet for pets, an agricultural and horticultural material, etc. CONSTITUTION:These antimicrobial resin grains are obtained by mixing a slurry containing amorphous calcium phosphate particles with an antimicrobial metallic ion (e.g. gold, silver, zinc or copper), dispersing the resultant antimicrobial amorphous calcium phosphate particles 2 in a dispersion medium, preparing a dispersion, then bringing the resultant dispersion into contact with water absorbing resin grains (preferably sodium polyacrylate) 1, covering at least the surface of the water absorbing resin grains 1 with the dispersion, then removing the dispersion and making the antimicrobial amorphous calcium phosphate particles 2 stick to the surface of the water absorbing resin grains 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a disposable diaper, a sanitary product,
The present invention relates to an antibacterial resin composition and a method for producing antibacterial resin particles used for a drip water absorption sheet for food, a dew condensation preventing material, a pet sheet, an agricultural / horticultural material, and the like.

[0002]

2. Description of the Related Art Conventionally, a water-absorbent sheet using a water-absorbent resin has been used for various purposes such as diapers, sanitary items, food drip sheets, anti-condensation materials, pet sheets, agricultural and horticultural materials.

However, when the water absorbent resin absorbs water, the surface material of the water absorbent sheet also becomes hydrated.
Therefore, a mold grows on the surface of the surface material, and various bacteria easily propagate.

For example, when a water-absorbent sheet is used as a drip sheet for food, if the surface of the sheet contains germs, the freshness of the food is deteriorated, and the diaper, sanitary product,
It is unsanitary when used for sheets and the like, and when used as a dew condensation prevention sheet, the ceiling plate on its surface,
There were problems such as mold on the wallpaper and fittings.

Therefore, in order to avoid the above problems, it is conceivable to mix an antibacterial agent with a water-absorbent resin when manufacturing a water-absorbent sheet, as disclosed in, for example, JP-A-63-15654. It was

However, in the conventional water-absorbent sheet, in the method of blending the antibacterial agent together with the water-absorbent resin, there are many portions where the water-absorbent resin does not have antibacterial action even if it absorbs water. It wasn't.

Therefore, in order to achieve the above object, as disclosed in Japanese Patent Application Laid-Open No. 3-59075, there is known a water absorbent resin having a surface coated with an antibacterial agent.
As the above-mentioned antibacterial agent, antibacterial ceramic coating (Nissho Research Laboratories, TS-5005A), carbitol, organic silicon quaternary aluminium salt (Dow Corning, DC
5700), 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine (manufactured by Hokuko Sangyo Co., Ltd., Densyl S25), 10,1
0'-Oxybisphenoxyalkane (Nomura Laboratory, Durotex 7603) is used.

[0008]

However, in the above-mentioned conventional water-absorbent sheet, each of the antibacterial agents (1) to (3) has toxicity to human beings, and thus it is difficult to use the drip water-absorbent sheet particularly in contact with foods. In addition, the antibacterial ceramic coating of 1 has a small antibacterial effect and needs to be used in a large amount, which causes a problem of increasing cost.

Therefore, the object of the present invention is high safety,
An object is to provide an antibacterial resin composition having excellent antibacterial properties and a method for producing antibacterial resin particles.

[0010]

The inventors of the present invention have conducted various studies in order to solve the above problems, and as a result, have developed antibacterial particles composed of antibacterial amorphous calcium phosphate particles to which antibacterial metal ions are adsorbed. The inventors have found that the above problems can be solved by adhering to the surface of water-absorbent resin particles and imparting antibacterial properties to the water-absorbent resin particles, and have completed the present invention.

In the antibacterial resin composition according to claim 1 of the present invention, antibacterial amorphous calcium phosphate particles composed of amorphous calcium phosphate particles adsorbing antibacterial metal ions are provided on the surface of the water absorbent resin. It is characterized by that.

In the antibacterial resin composition according to claim 2 of the present invention, a part of the antibacterial amorphous calcium phosphate particles composed of the amorphous calcium phosphate particles having the antibacterial metal ions adsorbed is formed on the surface of the water absorbent resin particles. It is characterized by being buried.

In the method for producing antibacterial resin particles according to claim 3 of the present invention, the antibacterial amorphous calcium phosphate particles obtained by mixing the slurry containing the amorphous calcium phosphate particles and the antibacterial metal ion are A dispersion liquid dispersed in a dispersion medium is prepared, and then the dispersion liquid and the water-absorbent resin particles are brought into contact with each other to cover at least the surface of the water-absorbent resin particles with the dispersion liquid, and then the dispersion. The antibacterial amorphous calcium phosphate particles are attached to the surface of the water absorbent resin particles by removing the medium.

The water-absorbent resin may be any water-absorbent resin conventionally used in diapers, sanitary products, food drip sheets, anti-condensation materials, pet sheets, agricultural and horticultural materials, and the like. Crosslinked polyacrylate, starch-acrylate graft copolymer, vinyl alcohol / acrylate copolymer, acrylate / acrylamide copolymer, cellulose / acrylate copolymer, etc. Acrylic acid sodium salt is preferred.

The amount of the antibacterial amorphous calcium phosphate particles used is 0.3 to 10 parts, preferably 1 to 5 parts, relative to 100 parts of the water absorbent resin. It depends on the concentration of the active ingredient in it. When the amount of the antibacterial amorphous calcium phosphate particles is small, molds and other bacteria are likely to grow, and when the amount is too large, the effect on the amount used is hardly seen.

The above-mentioned antibacterial amorphous calcium phosphate particles contain antibacterial metal ions and amorphous calcium phosphate (Amor).
phous Calcium Phosphate: hereinafter abbreviated as ACP) It is obtained by mixing with a slurry containing particles.

The above slurry is prepared by adding a neutral or weakly alkaline, water-soluble polymer dispersant, such as ammonium triacrylate, to a suspension of calcium hydroxide with stirring.
After adding 0.1 to 10% by weight, preferably 0.1 to 3% by weight, to obtain a mixed solution, the pH of the mixed solution under stirring is adjusted to 10 to 5 by dropwise addition of an aqueous phosphoric acid solution to adjust the particle size to about It contains ACP particles of 0.1 μm or less. Thus, in order to obtain ACP particles having a particle size of about 0.1 μm or less while avoiding their aggregation, it is necessary to add the above-mentioned polymer dispersant.

In this slurry, an antibacterial metal powder, an antibacterial metal compound, or an aqueous solution thereof is mixed so that the amount of the antibacterial metal ion in the ACP particles becomes 50% by weight or less. Substitution was performed to obtain antibacterial ACP particles composed of ACP particles adsorbing the above antibacterial metal ions.

When antibacterial metal ions are added to the slurry in the form of antibacterial metal powder or antibacterial metal compound powder, their particle size is 20 μm in order to improve the solubility.
The following is desirable.

Antibacterial metals include gold, silver, zinc, copper,
At least one metal selected from tin, lead, arsenic, platinum, iron, antimony, nickel, aluminum, barium, cadmium, manganese, a mixture thereof, a metal compound thereof, and an aqueous solution thereof can be used.

In the dispersion liquid in which the antibacterial ACP particles are dispersed, any dispersion medium may be used as long as it does not adversely affect the water absorbent resin and is easily removed by evaporation, such as water or alcohol. And toluene, etc. are used. Usually, water or a water-containing solvent is preferable as the dispersion medium so that the water-absorbent resin has tackiness due to swelling
The addition amount of antibacterial ACP particles in the dispersion liquid is
It is about 0.5 to 5% by weight.

As a method for providing the antibacterial ACP particles on the surface of the water absorbent resin particles, a dispersion liquid of the antibacterial ACP particles is sprayed on the surface of the water absorbent resin particles, or dispersed in the water absorbent resin particles under stirring. After adding a liquid to bring the dispersion liquid into contact with the surface of the water-absorbent resin particles by coating, the dispersion medium of the dispersion liquid is removed to the outside of the system to attach antibacterial ACP particles to the surface of the water-absorbent resin particles. A method for obtaining the desired antibacterial resin particles can be mentioned.

In removing the dispersion medium, in the case of a water-containing solvent,
In an open system, for example, a method of increasing the temperature to a predetermined temperature to remove it, or a method of removing by heating under reduced pressure. On the other hand, in the case of alcohols, in addition to the above methods, only reducing the pressure,
Alternatively, there is a method of removing it by leaving it to stand naturally.

When a water-containing solvent is used as the dispersion medium of the dispersion liquid, the water-absorbent resin particles swell and soften due to the water content of the water-containing solvent, resulting in tackiness. When the dispersion is mixed with such a water-absorbent resin, a part of each antibacterial ACP particle of the dispersion is intruded, that is, it is adhered to the surface of the water-absorbent resin due to the adhesiveness in a buried state. It will be. Thereby, each of the above antibacterial ACP particles,
The contact area with the surface of the water absorbent resin can be increased and the surface of the water absorbent resin can be more firmly adhered.

Therefore, since the surface of the water-absorbent resin that has absorbed water is most prone to the growth of various bacteria, the antibacterial ACP particles are more firmly held on the surface of such water-absorbent resin,
It is possible to efficiently exhibit antibacterial properties.

As another method, a cross-linking agent and water are added to the water-absorbent resin, and then the dispersion is added with stirring, the temperature in the reaction system is raised to a predetermined temperature, and the cross-linking reaction and drying are performed. The method of doing is mentioned. The temperature conditions for smoothly drying the dispersion and crosslinking the resin vary depending on the type and amount of the dispersion used, the type of crosslinking agent, the use of the antibacterial resin composition, etc., but are usually 60 to 150 ° C. Is preferred.

Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

[0028]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the antibacterial resin composition is composed of amorphous calcium phosphate (Amorphou) which adsorbs silver ions as antibacterial metal ions.
s Calcium Phosphate (hereinafter, abbreviated as ACP), the antibacterial ACP particles 2 are provided on the surface of the water absorbent resin particles 1.

First, the method for preparing the ACP particles will be described. First, a calcium hydroxide suspension with stirring is prepared.
After adding 0.5% by weight of ammonium triacrylate, which is a weakly alkaline and water-soluble polymer dispersant, to obtain a mixed solution, adjust the pH to 10 by adding the aqueous phosphoric acid solution dropwise to the above mixed solution with stirring. The particle size is about 0.1μm
A slurry containing the following ACP particles was obtained.

The above ACP particles were subjected to powder X-ray diffractometry to determine the pattern of calcium phosphate [Ca ₃ (PO ₄ ) ₂
nH ₂ O] and its pattern is broad, confirming that it is amorphous calcium phosphate. Moreover, the ACP particles are considered to be electrostatically active substances because they contain water of crystallization, and thus they are mutually adsorbed by various fungi and viruses, and also by ionic substances and hydrophilic substances having hydroxyl groups. It was supposed to be easier.

AC prepared by diluting the above slurry with ion-exchanged water so that the concentration of ACP is 20% by weight.
A P slurry was obtained. Anhydrous silver nitrate powder dissolved in ion-exchanged water was added to the ACP slurry in an amount of 0.1 mol% and 0.2 mol.
%, 0.5 mol%, 1 mol%, 2 mol%, 5 mol%, 10mo
1%, and the mixture was stirred for 1 hour with a stirring motor to obtain a mixture slurry (dispersion liquid).
To convert the above mol% to weight%, use the conversion factor
Write 1.07.

Each of the above mixture slurries avoids agglomeration of ACP particles by adding the above-mentioned polymer dispersant,
Some of the ion-exchangeable metal ions in the ACP particles were almost completely replaced by silver ions, and the particle size was about 0.1 μm.
Antibacterial AC with the following silver ions adsorbed at each content
It contains P particles (antibacterial amorphous calcium phosphate particles) 2.

Next, the antibacterial activity of each antibacterial ACP particle 2 containing 0.5 mol% and 1.0 mol% of silver ion was measured. As Comparative Example 1, commercially available antibacterial apatite particles (having a silver ion content of 2% by weight) were used.

Test method 1. Preparation of bacterial solution Test bacterial cells cultured in agar medium at 37 ° C for 18 hours are suspended in phosphate buffer (1 / 15M, pH 7.2) to prepare a stock solution of 10 ⁸ cells / ml. The stock solution was diluted appropriately and used for the test.

2. Antibacterial Test (Shake Flask Method) 0.1 g of each antibacterial ACP particle 2 and antibacterial apatite particle was weighed as a sample, and the phosphate buffer solution 100
Place the solution in a 200 ml Erlenmeyer flask containing ml and add the test bacterial suspension to about 10 ⁵ cells / ml, and shake the Erlenmeyer flask while keeping it at 25 ° C ± 5 ° C. Then, the number of bacteria in the Erlenmeyer flask was measured. The strains used are as follows.

Strains used Escherichia coli IFO-12
734 Staphylococcus aureus IFO-12
732 Psedomonas aeruginosa IFO-12
689 Candida albicans IFO-10
60 Medium used Bacteria: Mueller Hinton 2 (BBL) Fungus: Potato dextrose agar medium (Eiken) The above measurement results are shown in Tables 1 to 4. In the above tables, antibacterial ACP particles 2 containing 1.0 mol% of silver ion
Was designated as Sample No. 1, and antibacterial ACP particles 2 containing 0.5 mol% of silver ion were designated as Sample No. 2.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

[Table 3]

[0040]

[Table 4]

As described above, it was shown that the antibacterial ACP particles 2 have a higher antibacterial action than the antibacterial apatite particles which are commercially available as conventional antibacterial particles. This is because the antibacterial ACP particles 2 have a particle size of 0.1 μm or less, and thus have a large specific surface area which is an area in contact with bacteria, and moreover, ACP used as a base material has a high bacteria adsorption capacity (Asahi Shimbun, 1993). It was assumed to have the evening edition of January 16, 2014).

[Example 1] Next, an example using the antibacterial ACP particles 2 will be described as Example 1 with reference to FIG. 10 g of water-absorbent resin particles made of a powder of a cross-linked polyacrylic acid sodium salt having a particle size of 400 to 700 μm (manufactured by Sekisui Plastics Co., Ltd., trade name: Aquamate),
The mixture slurry containing 1 g of the antibacterial ACP particles was stirred with a stirrer to uniformly disperse both of them to obtain a mixture.

Then, the mixture was heated at about 140 ° C. for 3 hours to remove water as a dispersion medium contained in the mixture slurry from the outside of the system to obtain a particulate antibacterial resin composition. As the drying method at this time, heat drying by a dryer was used, but as another drying method, a known drying method such as vacuum drying can be used depending on the physical properties of the dispersion medium.

When the above-mentioned antibacterial resin composition was observed by a scanning electron microscope (SEM), the antibacterial ACP particles 2 were adhered to the surface of the water absorbent resin particles 1 as shown in FIG. In such an antibacterial resin composition, the concave portion 1a is formed on the surface of the water absorbent resin particle 1, and the concave portion 1a is formed.
A part of the antibacterial ACP particles 2 was embedded in, that is, embedded, and more firmly adhered.

This was considered to be due to the following reason. That is, the water-absorbent resin particles 1 are swelled and softened by the water contained in the mixture slurry when mixed with the mixture slurry, and have tackiness.

A part of each of the antibacterial ACP particles 2 contained in the above-mentioned mixture slurry is collided with the water absorbent resin particles 1 as described above, so that the water absorbent resin particles 1 are collided with each other.
The concave portion 1a is formed on the surface of the.

Therefore, a part of each of the antibacterial ACP particles 2 can be buried in the recess 1a to increase the contact area with the water absorbent resin particle 1, so that the recessed portion is formed by the adhesiveness of the water absorbent resin particle 1. The inner surface of 1a is more firmly bonded.

Further, each of the above antibacterial ACP particles 2 has an electrostatic property and the water-absorbent resin particles 1 have hydrophilicity, and therefore has an affinity for the water-absorbent resin particles 1. It was considered that the water-absorbent resin particles 1 were also adsorbed on the surface due to their affinity.

After that, when the above mixture is dried, the water-absorbent resin particles 1 shrink to more firmly and firmly adhere to the above antibacterial AC.
The P particles 2 are held on the surface of the water absorbent resin particles 1.

Example 2 First, the above-mentioned mixture slurry was dried to obtain antibacterial ACP particles 2, and then the antibacterial ACP particles 2 were suspended in ethanol as a dispersion medium to prepare a suspension. Prepared. Subsequently, 10 g of water-absorbent resin particles made of powder of crosslinked polyacrylic acid sodium salt having a particle size of 400 to 700 μm (manufactured by Sekisui Plastics Co., Ltd., trade name: Aquamate) and the above antibacterial ACP particles. The suspension containing 1 g was stirred with a stirrer to uniformly disperse both of them to obtain a mixture. Then, the mixture was heated at about 60 ° C. for 30 minutes to remove ethanol as a dispersion medium contained in the mixture slurry outside the system to obtain a particulate antibacterial resin composition.

When the above-mentioned antibacterial resin composition was observed by a scanning electron microscope (SEM), the antibacterial ACP particles 2 were attached to the surface of the water absorbent resin particles 1 as shown in FIG. In such an antibacterial resin composition, compared with Example 1, since water was used as the dispersion medium, the water-absorbent resin particles 1 swell less and the water-absorbent resin particles 1
Almost no concave portion 1a was formed on the surface of the.

However, in the antibacterial resin composition, each of the antibacterial ACP particles 2 ... Is formed of the water absorbent resin particles 1 due to the tackiness of the water absorbent resin particles 1 and the hydrophilicity of the water absorbent resin particles 1. It was considered that it was adsorbed on the surface.

Further, in the above antibacterial resin composition, since ethanol was used as the dispersion medium, the evaporation property was good and the drying time could be shortened.

[Comparative Example 2] As Comparative Example 2, as a resin composition to which antibacterial particles are not applied, a powder of a crosslinked sodium polyacrylate salt having a particle size of 400 to 700 μm (trade name, manufactured by Sekisui Plastics Co., Ltd., trade name) : Aquamate) was used.

Next, the above-mentioned Examples 1 and 2 and Comparative Example 2
An antibacterial test was carried out on each of the resin compositions obtained in the above.

Antibacterial test method 1) Test strain Black mold (Aspergillus genus) 2) Preparation of test bacterial solution A liquid medium (SCD medium) is inoculated with the mold, and the liquid medium is shake-cultured at 28 ° C. for 24 hours, The bacterial solution in which the above mold was grown was used as a test bacterial solution.

3) Test operation On the agar medium prepared in a petri dish, the above test bacterial solution 0.05
ml was spread evenly, and each resin composition of each of Examples 1 to 2 and Comparative Example 2 was used as a sample in the center of the agar medium.
After mounting 0.5 g each, 1 ml of sterilized physiological saline was added to the sample to spread the sample on the agar medium in a substantially circular shape. Subsequently, each petri dish was sealed with a rose film and cultured in a 28 ° C. incubator for 5 days.

4) Measurement Results After 5 days, the presence or absence of mold colonies was visually observed in the contact area (within a circle with a diameter of about 3 cm) with the agar medium.

From the above measurement results, no colony was found in each of the antibacterial resin compositions in Examples 1 and 2. On the other hand, in the antibacterial resin composition of Comparative Example 2, generation of colonies was observed on the entire rough surface. In each of the above Examples, no inhibition circle was observed.

As described above, the configuration in each of the above embodiments is as follows.
Since it has excellent antibacterial properties and the ACP particles used as the base material are in-vivo substances, they are extremely safe. Therefore, the above configuration is preferably used for a food drip water-absorbent sheet such as a tray for placing food such as fresh food, a paper diaper, and further sanitary items, anti-condensation materials, pet sheets, agricultural and horticultural materials, etc. You can

By the way, when a drip water-absorbent sheet for food is formed by using an elution-type antibacterial agent, the taste of the food is changed by the eluted antibacterial agent, and the anti-condensation material and the horticultural material have a relatively long life. When an elution-type antibacterial agent was used for the water-absorbent sheet used for a long time, the antibacterial agent fell off and the antibacterial action could not be maintained for a long time.

However, in the above structure, the antibacterial AC
Since the P particles 2 are insoluble in water, it is possible not to change the taste of the food and to keep the antibacterial action for a long time.

The structure of the above embodiment is different from the conventional one in which the antibacterial agent is simply mixed with the water-absorbent resin, and the antibacterial agent is held in the laminate composed of the water-absorbent resin and the substrate. The antibacterial ACP particles 2 can be exposed on the surface. From this, when the above-mentioned structure is used for a water absorbing sheet or the like, it becomes possible to exert a more uniform antibacterial action inside the water absorbing sheet.

Further, in the conventional method in which the antibacterial agent is kneaded into the resin, the antibacterial agent that has entered the resin does not exert an antibacterial effect, so that a part of the antibacterial agent is wasted.
The antibacterial ACP particles 2 added in the production method according to the present invention
Are all held on the surface of the water-absorbent resin particles 1, so that all of the added antibacterial ACP particles 2 can exert an antibacterial effect, and it is possible to obtain particles having improved antibacterial properties.

In addition, in the method of the above-mentioned embodiment, by adding the polymer dispersant, the respective antibacterial ACP particles 2 ... Can be made into particles of 0.1 μm or less while avoiding their aggregation, and thus the respective antibacterial ACP particles 2 The specific surface area of can be increased. As a result, in the above method, the contact area between each antibacterial ACP particle 2 and the surface of the water absorbent resin particle 1 can be increased, and each antibacterial ACP particle 2 ... It is possible to obtain the above-mentioned product, and it is possible to obtain the one having improved antibacterial property by increasing the specific surface area.

[0066]

As described above, in the antibacterial resin composition according to claim 1 of the present invention, the antibacterial amorphous calcium phosphate particles composed of the amorphous calcium phosphate particles adsorbing the antibacterial metal ions are water-absorbent resin. Is provided on the surface of the.

Therefore, in the above structure, by using amorphous calcium phosphate, elution of antibacterial metal ions can be prevented by adsorption and antibacterial property can be improved, and amorphous calcium phosphate is a substance in vivo. Therefore, it is highly safe.

Therefore, the above-mentioned constitution is excellent in safety and antibacterial property, and is a drip water absorption sheet for food such as a tray for placing food such as fresh food, paper diaper, sanitary goods, and anti-condensation material. The effect is that it can be suitably used for pet sheets, agricultural and horticultural materials, and the like.

As described above, in the antibacterial resin composition according to the second aspect of the present invention, a part of the antibacterial amorphous calcium phosphate particles composed of the amorphous calcium phosphate particles adsorbing the antibacterial metal ions is water absorbent. It is a structure buried in the surface of the resin.

Therefore, in the above structure, since a part of the antibacterial amorphous calcium phosphate particles is buried in the surface of the water absorbent resin, the antibacterial amorphous calcium phosphate particles are more firmly attached to the surface. The antibacterial amorphous calcium phosphate particles can be provided and the antibacterial property can be maintained for a longer period of time.

In the method for producing antibacterial resin particles according to claim 3 of the present invention, the antibacterial amorphous calcium phosphate particles obtained by mixing the slurry containing the amorphous calcium phosphate particles and the antibacterial metal ion are A dispersion liquid dispersed in a dispersion medium is prepared, and then the dispersion liquid and the water-absorbent resin particles are brought into contact with each other to cover at least the surface of the water-absorbent resin particles with the dispersion liquid, and then the dispersion. In this method, the antibacterial amorphous calcium phosphate particles are attached to the surface of the water absorbent resin particles by removing the medium.

Therefore, in the above method, the antibacterial amorphous calcium phosphate particles can be provided only on the surface of the water-absorbent resin particles, and the antibacterial amorphous calcium phosphate particles can be more firmly formed. Since the particles adhered to the surface can be obtained, it is possible to obtain antibacterial resin particles having improved antibacterial properties.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an antibacterial resin composition of Example 1 of the present invention.

FIG. 2 is a schematic configuration diagram of an antibacterial resin composition of Example 2 of the present invention.

[Explanation of symbols]

1 Water-absorbent resin particles 2 Antibacterial ACP particles (antibacterial amorphous calcium phosphate)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C08L 101/00

Claims (3)

[Claims] 1. An antibacterial resin composition, wherein antibacterial amorphous calcium phosphate particles composed of amorphous calcium phosphate particles having adsorbed antibacterial metal ions are provided on the surface of a water absorbent resin. 2. An antibacterial resin composition characterized in that a part of the antibacterial amorphous calcium phosphate particles composed of the amorphous calcium phosphate particles adsorbing the antibacterial metal ions are embedded in the surface of the water absorbent resin. . 3. A dispersion liquid in which antibacterial amorphous calcium phosphate particles obtained by mixing a slurry containing amorphous calcium phosphate particles and antibacterial metal ions are dispersed in a dispersion medium, and then, , Contacting the dispersion liquid and the water-absorbent resin particles, after covering at least the surface of the water-absorbent resin particles with the dispersion liquid, by removing the dispersion medium the antibacterial on the surface of the water-absorbent resin particles A method for producing antibacterial resin particles, characterized by comprising adherent amorphous calcium phosphate particles.