JPH10249922A - Container with antibacterial property and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate decomposition of antibacterial agent even in a container using resin having high melting temperature by heating a preform provided with an OP agent layer containing the antibacterial agent on an outer surface of the preform, and orientation blow molding it, thereby thinning the OF agent layer. SOLUTION: A preform 2 is coated on its surface with an OP agent solution 8 containing antibacterial agent to obtain a preform 3 having an OP agent layer containing the antibacterial agent. The preform 3 is orientation blow molded by a normal orientation blow molding machine. First, the preform 3 having the OP agent layer is heated by an infrared heater or contact heating. Thus, a surface temperature of a body 7 with a bottom is raised, for example, to 100 to 150 deg.C, and then slowly cooled. In the case of PET resin, it is lowered to an orientation temperature of, for example, 70 to 100 deg.C, thereby making the temperature distribution of the body 7 uniform. Thereafter, an orientation rod and compressed air are used together to be orientation blow molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial container containing shampoo, rinse, liquid soap, detergent and the like, and a method for producing the same. More specifically, the present invention relates to a humid condition such as a bathroom or a washroom. Related to containers having antimicrobial properties against harmful microorganisms such as pathogenic Escherichia coli and mesitillin-resistant Staphylococcus aureus, which suppress the occurrence of slime and darkening caused by microorganisms when placed, and adhere to the outer surface of the containers, and a method for producing the same. It is.

[0002]

2. Description of the Related Art When a container is placed in a humid condition such as a bathroom or a washroom, the microorganisms generated on the outer surface of the container can be prevented from slimming and darkening, and pathogenic Escherichia coli adhered to the outer surface of the container. In order to have an antibacterial effect on harmful microorganisms such as mesitillin-resistant Staphylococcus aureus, an antibacterial agent is contained in the resin of the container. Antibacterial agents include quaternary ammonium drugs such as benzalkonium ion and cetylpyridinium ion, thiazoline drugs such as 2-n-octyl-4-isothiazolin-3-one, and phenol drugs such as ortho-phenylphenol (OPP). , Thiabendazole (TBZ), zinc pyrithione (ZP
T) and the like. For these containers, a preform that is a precursor of the container is created by a direct blow molding method, or the preform is reheated, inserted into a mold, and then blown with air (blow) blow molding. Made by cold parison blow molding to make containers. A polyolefin resin is used as a resin for the container that does not contain an antibacterial agent, and recently, a polyester-based resin is often used.

[0003]

However, in a container containing an antibacterial agent, the antibacterial agent is dispersed and contained in the entire resin layer of the container, and the function of the antibacterial agent is wasted. Is made into a multilayer container, and an antibacterial agent is added only to the resin layer forming the outermost layer so that the antibacterial agent is not wasted. However, even in this case, if the outermost layer has a certain thickness, the antibacterial agent inside the outermost layer cannot exhibit its function, and is wasted. In normal blow molding, the layer ratio of the outermost layer is usually set to about 10%. If the layer ratio is to be lowered, the film is cut off, and there is a portion where the antibacterial agent layer does not exist. Had limitations. For this reason, it has been desired to make the antimicrobial agent layer thinner so that the antimicrobial agent works efficiently.

Further, when blow molding is performed by incorporating an antimicrobial agent into a resin, the heat resistance of the antimicrobial agent becomes a problem, and the antimicrobial agent cannot be used with a resin having a high melting temperature such as a polyester resin. was there. That is, the heat resistant temperature of the antibacterial agent (the temperature at which the antibacterial component is not decomposed) is about 230 ° C. or less. In the polyolefin resin, the blow molding temperature is about 180 ° C. to 230 ° C. in the direct blow molding method, and in the cold parison blow molding method,
Both preform molding temperature and blow molding temperature are 180 ° C ~
Since it is molded at a temperature lower than 230 ° C., the antibacterial component does not decompose. However, in the case of a polyester resin, for example, in the case of polyethylene terephthalate (PET) resin, the molding temperature is 260 ° C. (usually from 260 ° C.
C.) or higher, and in the cold parison blow molding method, the blow molding temperature is 230 ° C. or lower, but the preform molding temperature is 260 ° C. or higher. I will.

On the other hand, instead of a preformed container in which a resin layer containing an antimicrobial agent in a resin is provided on the outer surface, a paint containing an antimicrobial agent is applied to the outer surface of the molded container. It is possible to do. However, if the shape of the molded container is complicated, uneven coating can occur.

In view of the above problems, the present invention provides a thin OP layer containing an antibacterial agent on the outside of a container so that the antibacterial agent works efficiently and uses a resin having a high melting temperature such as a polyester resin. An object of the present invention is to provide a container having an antibacterial property without decomposing an antibacterial agent in a container and a method for producing the container.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention first provides a container having a thinner OP agent layer containing an antibacterial agent on the outer surface of the container. A preform provided with an antimicrobial-containing OP agent layer on the outer surface of the preform, the preform being heated and subjected to stretch blow molding to make the OP agent layer thinner, thereby providing a container having antibacterial properties. It is.

According to a second aspect of the present invention, the thinned OP agent layer of the antibacterial container of the first aspect is provided on the neck or bottom of the outer surface of the container, or on the neck and bottom.
This is a container having antibacterial properties characterized by being provided.

According to a third aspect of the present invention, the outer surface of the preform is coated with an OP agent containing an antibacterial agent, and
A method for producing a container having antibacterial properties, wherein a P agent layer is provided, and a preform having the OP agent layer is heated and stretch blow-molded to make the OP agent layer thinner.

By taking the measures of the present invention, it is possible to reduce the thickness of the antibacterial agent layer by stretching and blowing the preform provided with the antibacterial agent-containing OP agent layer on the preform by the cold parison method. It can be used effectively without wasting antibacterial agents. In addition, the cold parison method focuses on the fact that the blow molding temperature can be lower than the molding temperature of direct blow molding, and even with a resin having a high melting temperature such as a polyester resin, the preform can be formed at a normal molding temperature (for an antibacterial agent). (Higher than the heat resistance temperature), and an OP agent layer containing an antimicrobial agent is provided on the preform by coating such as dipping, and the preform is reheated (lower than the heat resistance temperature of the antimicrobial agent) and blow molded. By doing
A container having antibacterial properties can be manufactured.

[0011]

Embodiments of the present invention will be described below. The method for producing the antibacterial container of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a container having antimicrobial properties as a final product. As shown in FIG. 2, the preform 2 has a screw portion 5, a flange portion 6 serving as a support for the preform 2 during stretch molding, and a bottomed body portion 7.
Consists of Examples of a method for producing the preform 2 include injection molding, extrusion molding, compression molding, and machining, and a combination thereof.

The outer surface of the bottomed body portion 7 of the preform 2 is subjected to activation treatment such as frame treatment, corona treatment, ozone treatment, etc., and can be coated with an OP agent containing an antibacterial agent to enhance the adhesiveness. I do.

As shown in FIG. 3, an OP agent solution 8 containing an antibacterial agent is applied to the surface of the treated preform 2 by a dipping method or the like. Thus, the preform 3 provided with the OP agent layer containing the antibacterial agent as shown in FIG. 4 is obtained.

The preform 3 provided with the OP agent layer
Is performed by a usual stretch blow molding machine.
First, the preform 3 provided with the OP agent layer is heated by heating with an infrared heater or contact heating to raise the surface temperature of the bottomed body 7 to 100 to 150 ° C., and then the preform 2 is gradually cooled. 70 to 100 for PET resin
For the PP resin, the temperature is lowered to the stretching temperature of each resin of 110 to 130 ° C. to make the temperature distribution of the bottomed body 7 uniform. Thereafter, as shown in FIG. 5, stretch blow molding is performed using both the stretch rod 12 and the compressed air. Thus, a final molded article (a container having antibacterial properties) as shown in FIG. 1 is obtained.

The pressure and speed of the stretching rod are used
Depends on preform 2 shape and final molded product shape
But usually 3-20 kgf / cm^TwoPressure and 2
Moving the stretching rod at a speed of 50 cm / s
Can be. The compressed air used is the primary blow pressure and 2
Primary blow pressure can be set, primary blow pressure is 1-10k
gf / cm^Two, Secondary blow pressure is 10-40kgf / c
m ^TwoA pressure setting of about Note that the primary
Low pressure and secondary blow pressure must be separated
Not necessarily, stretch blow molding with a single pressure
It is also possible to do so without limiting the molding method.

The material for the stretch blow bottle used in the present invention may be any polymer that can be stretch blow molded, and specifically, polyethylene terephthalate (PE)
T), polyester resins such as polyethylene naphthalate (PEN), polyolefin resins such as polypropylene (PP), polyethylene and amorphous polyolefin, polyacrylonitrile, polycarbonate and the like. These plastics may contain known additives such as ultraviolet absorbers, plasticizers, lubricants, coloring agents, nucleating agents, antistatic agents and the like.

The thinned OP agent layer provided on the container will be described. The OP agent may be any one that has a stretching property that does not cause cracking of the coating layer when the coated preform is stretched and blown. Specifically, polyvinyl alcohol (PVA), saponified ethylene vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC) and the like.

Examples of usable antibacterial agents include quaternary ammonium drugs such as benzalkonium ion and cetylpyridinium ion, thiazoline drugs such as 2-n-octyl-4-isothiazolin-3-one, and ortho-phenylphenol (OPP). ), Thiabendazole (TBZ), zinc pyrithione (ZPT), and the like. In addition, antibacterial agents containing silver or silver ions can be used, but these antibacterial agents are discolored by light. Therefore, it is not preferable to use it for the outer layer of the container. The concentration of the antimicrobial agent added to the OP agent varies depending on the antimicrobial agent. For example, in the case of a quaternary ammonium antimicrobial agent, the effective ingredient concentration is about 0.02% by weight to 2.5% by weight. preferable. Also, 2-n-octyl-4-isothiazoline-3
-0.0 for on- and ortho-phenylphenol
1% to 0.1% by weight is suitable.

The part to be coated with the OP agent containing the antibacterial agent should cover the entire preform 2 by slimming,
It is preferable for the purpose of suppressing the occurrence of darkening, but from the viewpoint of reducing the amount of the antibacterial agent used, it can be slicked by dripping and the mouth, neck, or floor where darkening is likely to occur.
The coating may be focused on places where slimming or darkening is likely to occur, such as the bottom, which is in direct contact with the shelf and is difficult to dry.

[0020]

The present invention will be described in detail with reference to the following examples. <Example 1><< Container Preparation >> In addition to the container of Example 1, as a comparative example, a preform was prepared by directly mixing an antibacterial agent into PET resin in Comparative Example 1, and a stretch-blown container was prepared. Comparative Example 2 A container was prepared in the same manner as in Example 1 except that no antibacterial agent was used. PET resin (IV = 0.70) is injection molded at a cylinder temperature of 280 ° C. and a mold temperature of 20 ° C.
mm flange part 6, 25 mm diameter bottomed body part 7 Length 1
Preform 2 of 08 mm, thickness 3.4 mm, 21 g
(FIG. 2) was obtained. The preform 2 was subjected to a frame process as an activation process to have a wettability of 58 dyne. OP
As the agent solution 8, a PVA solution containing an antibacterial agent was used. As the antibacterial agent, a quaternary ammonium-based antibacterial agent in which benzalkonium ion is supported on tripolyphosphoric acid by ion exchange and used as benzalkonium ion (hereinafter referred to as antibacterial agent A) is used at 0.5% by weight. (% By weight based on the solid PVA). This OP agent solution 8 is placed in a liquid tank 9
Then, the preform 2 was immersed in this OP agent solution 8 (FIG. 3), pulled up and dried to obtain a preform 3 (FIG. 4) provided with an OP agent layer. The preform 3 provided with the OP agent layer is reheated at 110 ° C. and gradually cooled to uniformly set the preform temperature at 90 ° C. (stretching temperature), and the stretching rod pressure;
7 kgf / cm2, primary blow; 5 kgf / cm2,
0.5 s, secondary blow; stretch blow molding at 15 kgf / cm2, 3 s, 300 times longitudinal stretch ratio 1.3 times, transverse stretch ratio 2.6 times, container height 150 mm, diameter 65 mm 300
An antibacterial container 1 (FIG. 1) having a thinned OP agent layer 10 stretched to the outside of the ml was obtained. This container 1 had a transparent appearance, a uniform OP agent layer, and a thickness of 0.6 mm.

Comparative Example 1 PET resin (IV = 0.7
0), the same antibacterial agent A as in Example 1 was directly added in an amount of 0.5% by weight (% by weight based on PET resin).
Molded under the same molding conditions as in
25mm in diameter, 108mm in length, 3.4mm in thickness,
21 g of a preform were obtained. This preform is 11
Reheat at 0 ° C and cool slowly to make the preform temperature 9
0 ° C (stretching temperature), stretching rod pressure: 7kgf / c
m ² , primary blow; 5 kgf / cm ² , 0.5 s; secondary blow; stretch blow molding at 15 kgf / cm ² , 3 s; longitudinal stretch ratio 1.3 times, transverse stretch ratio 2.6 times, container An antibacterial agent-containing stretch blow container having a height of 150 mm and a diameter of 65 mm was obtained in a volume of 300 ml.

Comparative Example 2 Comparative Example 2 was produced by performing the same operation as in Example 1 without using an antibacterial agent.
The obtained container was a container having a transparent appearance, a uniform coating agent, and a wall thickness of 0.6 mm, as in Example 1.

<< Experiment Method >> [Experiment 1] Staphylococc was used to confirm the antibacterial properties of the container.
An antibacterial test against us aureus IFO 12732 (Staphylococcus aureus) was performed. Staphylococcus aureus IFO 12732 cells were suspended at a concentration of 10 希 釈 5 cells / ml in sterilized 500-fold diluted broth to prepare a bacterial solution for inoculation. Example 1, Comparative Example 1, and Comparative Example 2 The body of each container was cut into 50 mm x 50 mm, and 0.5 ml of the inoculum was dropped onto the antibacterial coated surface of the test piece.
Cover with 5mm square sterilized polyethylene film, 35
It was stored for 24 hours in an atmosphere at 90 ° C. and a relative humidity of 90%. After storage, SCDLP (Soybean-Casein-Digest-Lecithin-Pol
ysorbate80) wash the remaining bacteria with bouillon (10ml)
The number of surviving bacteria was determined by a pour method using a standard agar medium, and the number of bacteria per specimen was calculated.

[Experiment 2] To confirm the antibacterial property of the container,
Antibacterial test against Escherichia coli IFO 3972 (Escherichia coli)
The experiment was performed. In 500-fold diluted sterilized ordinary broth
Escherichia coli IFO 3972 ^FivePieces / ml
To prepare a bacterial solution for inoculation. Example 1, comparison
The container body of each of Example 1 and Comparative Example 2 was 50 mm
For inoculation on the antibacterial coated surface of a test piece cut out to × 50 mm
0.5 ml of bacterial solution is added dropwise, and 45mm x 45mm square sterilized poly
Covered with ethylene film, 35 ° C, 90% RH
Stored under for 24 hours. After storage, SCDLP (Soybean-Ca
sein-Digest-Lecithin-Polysorbate80) Bouillon (10m
1) Wash out the surviving bacteria and pour using standard agar medium
To determine the number of surviving bacteria, and the number of bacteria per specimen was calculated.

<< Experimental Results >> The results of Experiments 1 and 2 are shown in Table 1. Thus, the container of Example 1 had an extremely good antibacterial property with the number of bacteria less than 10. On the other hand, Comparative Example 2 did not use an antibacterial agent, so it was predicted that there was no effect. However, Comparative Example 1 had no effect even when an antibacterial agent was used. It seems that was decomposed by heat.

[0026]

[Table 1]

Example 2 << Preparation of Container >> In addition to the container of Example 2, as a comparative example, a preform was prepared by directly mixing an antibacterial agent into a PET resin in Comparative Example 3, and a container obtained by stretch blow molding was used. A container was prepared in the same manner as in Example 2 except that the antibacterial agent was not used in Comparative Example 4. A PP resin (MI = 8, ethylene content = 4%) was injection-molded at a cylinder temperature of 200 ° C. and a mold temperature of 15 ° C. to obtain a preform 2 (FIG. 2) weighing 15 g. The preform 2 was subjected to frame processing as an activation processing to have a wettability of 57 dyne. As OP agent solution 8,
An antimicrobial-containing PVA solution was used. Antibacterial agents include thiazoline drugs, 2-n-octyl-4-isothiazoline
An antibacterial agent carrying -3-one on silicon dioxide by adsorption
Using 2-n-octyl-4-isothiazolin-3-one (hereinafter referred to as antibacterial agent B) at 0.02% by weight
(% By weight based on the solid PVA). This OP
The preform 2 was immersed in the OP solution 8 (FIG. 3) to obtain an OP agent layer (FIG. 4).
The preform 3 provided with the OP agent layer was reheated at 140 ° C. and gradually cooled to a uniform preform temperature of 115 ° C. (stretching temperature), a stretching rod pressure of 7 kgf / cm ² , a primary blow of 5 kgf / cm ² . cm ² , 0.5 s, secondary blow; stretch blow molding at 15 kgf / cm ² , 3 s, 300 × long stretch ratio 1.3 times, transverse stretch ratio 2.6 times, bottle height 150 mm, diameter 65 mm, 300 ml An antibacterial container 1 (FIG. 1) having a thinned OP agent layer 10 stretched outside was obtained. The container 1 thus obtained had a transparent appearance, a uniform OP agent layer, and a thickness of 0.5 mm.

Comparative Example 3 The same antibacterial agent B as in Example 2 was added to PP resin (MI = 8, ethylene content = 4%).
Was directly added at 0.02% by weight (% by weight based on the PP resin), and molded under the same molding conditions as in Example 2 described above.
mm flange, 25 mm diameter body length 108 m
m, a thickness of 3.4 mm and a preform of 21 g were obtained. The preform was reheated at 140 ° C. and gradually cooled to a uniform preform temperature of 115 ° C. (stretching temperature), a stretching rod pressure of 7 kgf / cm ² , a primary blow of 5 kgf / cm ² .
cm ² , 0.5 s, secondary blow; 15 kgf / cm ² ,
Stretch blow molding at 3 s, longitudinal stretch ratio 1.3 times, transverse stretch ratio 2.6 times, bottle height 150 mm, diameter 65 m
Thus, 300 ml of a stretch blow container containing an antibacterial agent was obtained.

Comparative Example 4 In Comparative Example 4, the same operation as in Example 1 was performed without using an antibacterial agent. The container thus obtained had a transparent appearance, a uniform coating agent, and a wall thickness of 0.5 mm as in Example 1.

<< Experimental Method >> [Experiment 3] A suspension of Penicillum citrinum IFO 6352 spores was sprayed on a potato dextrose agar medium,
A sample obtained by punching out the container body of Comparative Examples 3 and 4 into a circular shape having a diameter of 10 mm was placed so that the medium and the antibacterial coat surface were in contact with each other.
After culturing at 25 ° C. for 96 hours, the presence or absence of an inhibition circle was confirmed.

<< Experimental Results >> The results of Experiment 3 are shown in Table 2. Thus, the container of Example 2 exhibited extremely good antibacterial properties. In contrast, Comparative Example 4 did not use an antimicrobial agent, so it was predicted that there was no effect. However, as in Comparative Example 3, even an antimicrobial agent used had no effect. This is probably because the antibacterial agent was decomposed by heat.

[0032]

[Table 2]

Example 3 << Preparation of Container >> In addition to the container of Example 3, a comparative example
In Comparative Example 5, an antibacterial agent was directly mixed into the PEN resin to obtain a preform.
And stretch blow-molded container, antibacterial agent in Comparative Example 6
Created a container that did not use. PEN resin (IV =
0.55) at a cylinder temperature of 280 ° C and a mold temperature of 20 ° C.
Injection molded, 27mm diameter flange, 25mm diameter
54mm long, 4.5mm thick, 25g pref
Form 2 (FIG. 2) was obtained. Activate this preform 2
As a process, a frame process was performed to make the degree of wettability 58 dyne.
As the OP agent solution 8, a PVA solution containing an antibacterial agent is used.
Was. As an antibacterial agent, 0.5% by weight of antibacterial agent A (solids
% By weight of PVA) and 0.02% by weight of the antibacterial agent B
% (% By weight based on the solids PVA). This
The OP agent solution 8 is put into the liquid tank 9 and the OP agent solution 8 is
The preform with the OP agent layer immersed in the reform 2 (FIG. 3)
Form 3 (FIG. 4) was obtained. A pre-fab provided with this OP agent layer
Form 3 is reheated at 110 ° C, and gradually cooled to preform
The temperature is uniformly set at 90 ° C (stretching temperature) and the stretching rod pressure
Power: 7kgf / cm ^Two, Primary blow; 5kgf / c
m^Two, 0.5s, secondary blow; 15kgf / cm ^Two, 3
Stretch blow molding at s, longitudinal stretching ratio 3.5 times, horizontal stretching
Elongation ratio 3 times, bottle height 200mm, diameter 75mm 8
With the thinned OP agent layer 10 stretched outside of 00 ml
A container 1 having antibacterial properties (FIG. 1) was obtained. Like this
The obtained container has a transparent appearance, a uniform OP agent layer, and a thick wall.
A 0.4 mm container was obtained.

[Container of Comparative Example 5] PEN resin (IV =
0.55), the same antimicrobial agents A and B as in Example 3 were directly added (0.5% by weight of antimicrobial agent A and 0.02% by weight of antimicrobial agent B), and the same molding as in Example 3 was performed. Molded under the conditions, flange part of diameter 27mm, body length 54 of diameter 25mm
Preform 2 (FIG. 2) having a thickness of 4.5 mm and a thickness of 4.5 mm was obtained. The preform 2 was re-heated at 110 ° C. and gradually cooled to a uniform preform temperature of 90 ° C. (stretching temperature). Stretching rod pressure: 7 kgf / cm ² , primary blow: 5 kgf / cm ² , 0.5 s , Secondary blow; 15
Stretch blow molding at kgf / cm ² , 3s, longitudinal stretch ratio 3.5 times, transverse stretch ratio 3 times, bottle height 200m
Thus, an 800 ml antibacterial agent-containing PVA-coated stretch blow container having a diameter of 75 mm and a diameter of 75 mm was obtained.

[Container of Comparative Example 6] In Comparative Example 6, the same operation as in Example 3 was performed without using an antibacterial agent. The container obtained in this manner was a container having a transparent appearance, a uniform coating agent and a wall thickness of 0.4 mm, as in Example 3.

<< Experimental Method >> [Experiment 4] Each of the containers of Example 3, Comparative Examples 5 and 6 was filled with shampoo and actually used in a bathroom. After two months, the surface condition was observed.

<< Experimental Results >> The results of Experiment 4 are shown in Table 3. Thus, the container of Example 3 showed extremely good antibacterial properties. On the other hand, Comparative Example 6 did not use an antibacterial agent, so it was predicted that there was no effect. However, as in Comparative Example 5, even one using an antibacterial agent had no effect. This is probably because the antibacterial agent was decomposed by heat.

[0038]

[Table 3]

Example 4 << Preparation of Container >> In addition to the container of Example 4, a comparative example
The containers of Comparative Example 1 and Comparative Example 2 were used for the experiment. As resin
PET (IV = 0.70) with cylinder temperature of 280 ° C,
Injection molding at a mold temperature of 20 ° C, flange with a diameter of 27mm
Part, 25 mm in diameter, body length 108 mm, thickness 3.4 m
m, 21 g of preform 2 (FIG. 2) were obtained. This pre
Form 2 frame processing as activation processing
58 dynes. As OP agent solution 8, the same as in Example 3
The same solution was used. This OP agent solution 8 is put into a liquid tank 9,
The preform 2 is immersed in this OP agent solution 8 (FIG. 3),
A preform 3 (FIG. 4) provided with a P agent layer was obtained. This O
The preform 3 provided with the P agent layer is reheated at 110 ° C.
Slowly cool the preform temperature uniformly to 90 ° C (stretching temperature)
And the stretching rod pressure: 7 kgf / cm ^Two, Primary blow
ー; 5kgf / cm^Two, 0.5s, secondary blow; 15k
gf / cm ^Two, Stretch blow molding at 3s, longitudinal stretch times
Ratio 1.3 times, transverse stretching ratio 2.6 times, bottle height 150m
m, OP extended to the outside of 300 ml with a diameter of 65 mm
Antibacterial container 1 having agent layer 10 (FIG. 1) was obtained.
The container thus obtained has a transparent appearance and an OP agent layer.
The container was uniform and had a thickness of 0.6 mm.

<< Experiment Method >> [Experiment 5] Same as Experiment 4

<< Experiment Results >> The results of Experiment 5 are shown in Table 4. Thus, the container of Example 4 exhibited extremely good antibacterial properties. On the other hand, Comparative Example 2 did not use an antibacterial agent, so it was predicted that there was no effect. However, as in Comparative Example 1, even one using an antibacterial agent had no effect. This is probably because the antibacterial agent was decomposed by heat.

[0042]

[Table 4]

<Example 5><< Preparation of Container >> Only the mouth and shoulder of the activated preform 2 obtained as in Example 1 were immersed in the same OP agent solution 8 as in Example 1. Thus, a preform provided with an OP agent layer was obtained. Thereafter, molding was performed under the same conditions as in Example 1. As comparative examples, the containers of Comparative Example 1 and Comparative Example 2 were used for the experiment.

<< Experimental Method >> [Experiment 6] Escherichia coli I was added to the body of each container.
A 500-fold diluted normal bouillon medium containing 10 ⁵ cells / ml of FO3972 (Escherichia coli) cells is applied using sterile gauze, and immediately after application (initial cell count) and after storage at 35 ° C for 24 hours in a 90% relative humidity atmosphere. Then, the cells were washed with SCDLP broth (10 ml), the number of surviving bacteria was determined by a pour method using a standard agar medium, and the number of bacteria per specimen was determined. [Experiment 7] Staphylococcus aur was added to the body of each container.
eus IFO12732 (Staphylococcus aureus) 10 ⁵ cells / ml
A 500-fold diluted normal broth medium containing sterile gauze was applied, and immediately after the application (initial bacterial count) and after storage for 24 hours in an atmosphere of 35 ° C. and 90% relative humidity, washed with SCDLP broth (10 ml) and standard agar The number of surviving bacteria was determined by a pour method using a medium, and the number of bacteria per specimen was determined.

<< Experimental Results >> The results of Experiments 6 and 7 are shown in Table 5. Thus, the container of Example 5 exhibited extremely good antibacterial properties. On the other hand, Comparative Example 2 did not use an antibacterial agent, so it was predicted that there was no effect. However, as in Comparative Example 1, even one using an antibacterial agent had no effect. This is probably because the antibacterial agent was decomposed by heat.

[0046]

[Table 5]

[0047]

According to the present invention having the above configuration, the following effects can be obtained. (1) By being stretched, the antimicrobial agent layer in the outermost layer can be made thinner, and the antimicrobial agent is regularly arranged and emerges, thereby maximizing the use of the antimicrobial agent and improving efficiency. (2) When a facility for providing an OP agent layer on a molded container considered in the prior art is compared with a facility for providing an OP agent layer on a preform in the present invention, the preform is smaller than the container, Equipment can be small. In addition, the preform usually has a simple shape such as a test tube having a cylindrical body with a bottomed body as compared with a container (particularly one having a complicated shape). There is an advantage that can hardly be done. (3) Even a resin having a high melting temperature, such as a polyester resin,
A container having antibacterial properties can be manufactured. Therefore, the present invention exhibits an excellent practical effect as an antibacterial container used for shampoos, liquid detergents and the like and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an antibacterial container provided with an antibacterial agent-containing stretched and thinned OP agent layer according to an embodiment of the present invention.

FIG. 2 is a sectional view of a preform showing an embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which a preform after an activation treatment according to an embodiment of the present invention is immersed in an OP agent solution.

FIG. 4 is a cross-sectional view of a preform provided with an OP agent layer according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a preform provided with an OP agent layer, which is stretched and blown, according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antibacterial container 2 ... Preform 3 ... Preform provided with OP agent layer 4 ... OP agent layer 5 ... Screw part 6 ... Flange part 7 ... Bottomed body part 8 ... OP agent solution 9 ... Liquid tank 10 ... thinner OP agent layer 11 ... mold 12 ... drawn rod

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 23/10 C08L 23/10 // B65D 1/02 B65D 1/02 B B29L 22:00

Claims (3)

[Claims] 1. A thin film containing an antibacterial agent on the outer surface of a container.
A container provided with a P agent layer, characterized in that the preform in which an OP agent layer containing an antimicrobial agent is provided on the outer surface of the preform is heated and stretch blow molded to make the OP agent layer thinner. A container having antibacterial properties. 2. A container having antibacterial properties, wherein the thinner OP agent layer of the container having antibacterial properties according to claim 1 is provided on the neck or bottom of the outer surface of the container, or on the neck and bottom. . 3. An OP agent layer containing an antimicrobial agent is coated on the outer surface of the preform to form an OP agent layer, and the preform having the OP agent layer is heated and stretch blow-molded.
A method for producing a container having antibacterial properties, characterized in that the OP agent layer is made thinner.