JPH11262967A - Laminate having antibacterial and antifungal action and bag element composed thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate continuously showing antibacterial and antifungal effect even to a non-contact surface and a bag element composed of the laminate. SOLUTION: A laminate is obtained by laminating two or more films or sheets through an adhesive layer and monoterpenses are added to this adhesive layer. As the film or sheet, a synthetic resin, paper, a pulp material, a fabric or a metal is pref. As monoterpenes, L-menthol, menthone, terpineol, carbene, carbeol, pregone, citral, citroneral, perylaldehide, 1,8-cineol, linalol and 4- terpineol are pref. A bag element is obtained by using the laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate having an antibacterial and antifungal action and a bag comprising the same.
The present invention relates to a laminated film and a laminated sheet having an antibacterial and fungicidal action.

[0002]

2. Description of the Related Art Recently, antibacterial properties of various articles have been emphasized not only in hospitals and other facilities requiring sanitary control but also in general households, and accordingly, packaging films, sheets, bags, etc. Also, it has been demanded to impart an antibacterial effect. Heretofore, as a film having an antibacterial effect, a film produced by kneading an inorganic antibacterial agent containing a metal or a metal ion into a synthetic resin has been known. However, this type of film has a long-lasting antibacterial effect, but has the drawback that it can exert its effect only in contact with the film.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and to provide a laminate and a bag made of the same, which exhibit an antibacterial and antifungal effect even on a non-contact surface which is persistent. It is the purpose.

[0004]

Means for Solving the Problems As a result of intensive studies on the above objects, the present inventors have found that, among various antibacterial and antifungal substances, an adhesive or an adhesive resin containing monoterpenes is used to form a film or a film. The present inventors have found that a laminate obtained by bonding sheets can achieve the above object, and have completed the present invention.

That is, the present invention has an antibacterial and antifungal effect characterized in that a laminate comprising two or more films or sheets bonded together via an adhesive layer, wherein the adhesive layer contains monoterpenes. And a laminate having the same. As the film or sheet, synthetic resin, paper,
It is preferably made of at least one material selected from the group consisting of pulp material, cloth and metal.

The monoterpenes preferably contain 0.1 to 80% by weight of the adhesive layer. Examples of the monoterpenes include L-menthol, menthol, terpineol, and the like.
Carvone, carveol, pulegone, citral, citronellal, perillaldehyde, 1,8-cineole,
Preferred is at least one compound selected from the group consisting of linalool and 4-terpineol, or a plant essential oil containing them.

Another object of the present invention is to provide a bag comprising the above-described laminate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below. The film or sheet used in the present invention is not particularly limited, and may be selected from combinations of various materials having different organic substance permeability, for example, synthetic resin, paper, pulp material, cloth, metal, and the like. Can be selected from the materials consisting of As the synthetic resin, polyethylene,
Polyolefins such as polypropylene, polyvinyl chloride,
Polyamides such as polyvinylidene chloride and nylon; polyesters such as polyethylene terephthalate; ethylene vinyl alcohol copolymer; and cellulose such as cellophane. Examples of the pulp molded article include synthetic paper. Examples of the metal include aluminum, copper, iron, and stainless steel.

As these combinations, there are combinations of synthetic resins, a combination of synthetic resin and paper, cloth, or metal. Combinations having different organic substance permeability are preferable. It is effective because antibacterial and antifungal effects can be expected on one side. The laminate of the present invention is one in which a monoterpene is contained in an adhesive layer for bonding two or more films or sheets as described above. Here, the organic substance permeability means the gas permeability of an organic substance such as monoterpenes.

The monoterpenes used in the present invention may be any monoterpenes having an antibacterial and antifungal action. Specific examples include L-menthol, menthol, terpineol, carvone, carveol, pulegone, citral, citronellal, perillaldehyde, 1,8-cineole, linalool, 4-terpineol and vegetable essential oils containing these. L represents L-form (levorotatory isomer). Some of these have not only an antibacterial and fungicidal action but also an insect repellent effect. The adhesive and the adhesive resin used for the adhesive layer are not particularly limited, and can be appropriately selected depending on a combination of films or sheets to be attached. Generally used ether-based adhesives are preferred. The laminate of the present invention contains an antimicrobial fungicide containing monoterpenes as an active ingredient in the adhesive layer, and preferably contains 0.1 to 80% by weight of the monoterpenes in the adhesive layer. . 0.002 to 10 in the laminate
g / m ² is preferred. When the content of monoterpenes is 0.
If it is less than 1% by weight, a sufficient antibacterial and antifungal effect cannot be obtained, and if it exceeds 80% by weight, there is a problem that the adhesive strength of the film is reduced. This adhesive layer usually has a thickness of 1 to 10 μm.
m.

Various lamination methods can be adopted for the lamination method, and may be appropriately selected depending on the combination of the films or sheets to be laminated. For example, a dry lamination method, a wet lamination method, an extruded sandwich lamination method, a wax coater may be used. Lamination method, hot melt lamination method and the like can be mentioned. Since the monoterpenes are rapidly dissolved in the organic solvent, they can be particularly uniformly dispersed in the adhesive layer in the dry lamination method, and the effect of the present invention can be expected on the entire lamination surface. In the wet lamination method, a solution-type or emulsion-type adhesive in which monoterpenes are uniformly dispersed can be prepared, and a uniform antibacterial and antifungal effect can be expected. In the sandwich lamination method, monoterpenes may be kneaded into the adhesive resin that is heated and melted.

Since the laminate of the present invention contains an antibacterial and fungicide in the adhesive layer, it does not directly touch a large amount of the antibacterial and fungicide even when the laminate is directly touched, and the safety is high.
In addition, since the laminate of the present invention contains an antibacterial and fungicide in the adhesive layer, the antibacterial and fungicide sublimated from the adhesive layer exerts an antibacterial and fungicidal effect. An antibacterial and antifungal effect can be expected even for a part that is not used.

In the bag made of the above laminate, an antibacterial and antifungal effect can be expected in the entire bag.
In addition, by using a film having good gas permeability inside the bag, a bag which exerts an antibacterial and fungicide effect preferentially on the inside of the bag can be obtained. Particularly, a bag made of a laminate in which a metal such as aluminum is laminated on the outer layer can selectively exert an antibacterial and antifungal effect only on the inside thereof. The bag body can be obtained by a known method, for example, by making the above-mentioned laminated body into a bag by using a heat seal or an adhesive.

[0014]

EXAMPLES The present invention will be described below more specifically based on experimental examples, but the present invention is not limited to these experimental examples. [Experimental Example] A laminate film was produced by a dry lamination method using a biaxially stretched nylon film as a front substrate and a linear low-density polyethylene film (1-hexene as a comonomer) as a back substrate. On this occasion,
As the adhesive layer, a material in which monoterpene (L-menthol) dissolved in ether was added to a generally used ether-based adhesive at 15% by weight based on the adhesive was used. Dry lamination was performed under the same conditions as usual except that monoterpene (L-menthol) was added. The antibacterial and antifungal effects of the obtained laminate film were evaluated by the following method.

(1) Fungicide test Four types of fungi (Aspergillus niger, Penicillum citriu)
m, Cladosporium cladosporioides, Chaetomium globo
potato dextrose agar medium spray-inoculated with the mixed spore suspension (sum) was placed in a bag (250 × 290 mm) made from the above laminated film. As a comparative example, the same operation was performed using a laminate film to which no monoterpene was added. Then, after standing at a temperature of 28 ° C. for 2 weeks and standing for 4 weeks, the growth state of the bacteria was observed. Table 1 shows the results of the evaluation based on the following criteria.

Evaluation criterion 0: No growth of hypha was observed in the medium. 1: The area of the hyphal growth area observed in the medium does not exceed 1/3 of the total area of the medium. 2: The area of the hyphal growth part observed in the medium exceeds one third of the total area of the medium.

[0017]

[Table 1]

In a bag made from an additive-free lamination film to which no monoterpene is added, 2
After a week, the growth area of the hypha exceeded one-third of the total area of the medium, whereas the bag prepared from the lamination film of the present invention did not show any growth of the hypha even after 4 weeks. From this result, it was confirmed that the lamination film of the present invention exerts a clear fungicidal effect even in a portion not in direct contact with the film.

(2) Fungicide test An artificial sweat was prepared according to JIS L0848-1978. Sterile gauze was immersed in this, and after absorbing artificial sweat sufficiently, it was taken out and lightly wiped to obtain a test piece. The test piece was placed on a carbon source-free inorganic salt medium, and four kinds of fungi (Aspergillus niger, Penicillum citrium, Cladospo)
A mixed spore suspension of rium cladosporioides and Chaetomium globosum) was sprayed to obtain a medium for evaluation. Bag (250 x 290 mm) made from the above laminated film
A medium for evaluation was placed therein. As a comparative example, the same operation was performed using a laminate film to which no monoterpene was added. Then, after standing at a temperature of 28 ° C. for 2 weeks and 4
After standing for a week, the growth of the bacteria was observed. Table 2 shows the results of the evaluation based on the following criteria.

Evaluation Criteria 0: No hyphal growth was observed on the test piece. 1: The area of the hyphal growth part observed on the test piece does not exceed 1/3 of the total area of the test piece. 2: The area of the hyphal growth part observed on the test piece exceeds one third of the total area of the test piece.

[0021]

[Table 2]

In the case of a bag made of a lamination film containing no added monoterpenes, 2
After a week, the growth area of the hypha exceeded one third of the total area of the test piece, whereas the bag prepared from the lamination film of the present invention did not show any growth of the hypha even after 4 weeks. From this result, it was confirmed that the lamination film of the present invention exerts a clear fungicidal effect even in a portion not in direct contact with the film.

[0023]

According to the present invention, it is possible to provide a laminated body and a bag made of the same, which exhibit an antibacterial and antifungal effect even on a non-contact surface which is persistent. Since it is a simple method of including monoterpenes in the adhesive layer of the film or sheet, it can be inexpensive. Further, by selecting a film or sheet material, it can be applied to various products such as use as a bag itself and use as a sheet in a container.

Claims (5)

[Claims] 1. A laminate having an antibacterial and fungicidal action, wherein a laminate comprising two or more films or sheets bonded together via an adhesive layer, wherein the adhesive layer contains monoterpenes. 2. The film or sheet is made of synthetic resin, paper,
The laminate having an antibacterial and fungicidal action according to claim 1, wherein the laminate has at least one material selected from the group consisting of pulp material, cloth, and metal. 3. An adhesive layer containing monoterpenes in an amount of 0.1 to 80.
The laminated body having an antibacterial and antifungal action according to claim 1 or 2 which is contained by weight. 4. The monoterpene is selected from the group consisting of L-menthol, menthol, terpineol, carvone, carveol, pulegone, citral, citronellal, perillaldehyde, 1,8-cineole, linalool, and 4-terpineol. The laminate having an antibacterial and antifungal activity according to any one of claims 1 to 3, which is at least one compound or a vegetable essential oil containing these compounds. 5. A bag comprising the laminate according to claim 1.