JPH01153601A - Tacky tape or sheet for preventing mold, microorganism and insect of vegetable, fruit or the like - Google Patents

Abstract

PURPOSE:To obtain the title tacky tape or sheet showing excellent preventing effects on molds, microorganisms and insects of ordinary perishable foods such as vegetables or fruits, by adding a specific amount hinokitiol, etc., to a pressure-sensitive tacky agent. CONSTITUTION:>=0.5% (solid content) solid hinokitiol which is colored or slight yellow crystal at normal temperature, has 48-52.5 deg.C melting point and becomes liquid at a relatively low temperature or beta-dolabrin which occurs in crude hinokitiol crystal extracted from a white cedar grown in Aomori Prefecture in almost the same amount as that of hinokitiol and shows approximately the same structure and characteristics is directly dissolved in a pressure-sensitive tacky agent or included in a cyclodextrin, etc., dispersed as an inclusion compound and blended with the pressure-sensitive tacky agent to produce the titled tape or sheet by an ordinary production process. The manufacturing cost is inexpensive. Since an adhesion tape is applied to the inner bottom face or inner side face of packaging containers, the packaging containers preferably have poor air permeability.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an adhesive tape or sheet for preventing mildew, germs, and insects on vegetables, fruits, etc., using hinokitiol or (and) β-drabulin. be.

(Prior art) It is known that hinokitiol and β-drabulin contained in Hiba oil produced in Aomori have an anti-mold and anti-bacterial effect on vegetables, fruits, etc. It is known to be effective.

A specific method of using hinokitiol is, for example, as disclosed in JP-A-60-108359, by bringing a packaging material containing hinokitiol and their clathrates into contact with food, or by covering or clasping the food with the packaging material. Methods for preserving such foods have been proposed. JP-A No. 60-108359 describes that packaging materials containing hinokitiol and their clathrates can be made by spraying or impregnating a solution or dispersion onto a substrate and then drying.

(Problems with the prior art) As described above, although hinokitiol is a substance that is harmless to humans and livestock and is effective in preventing fungi, bacteria, and insects,
The packaging material of No. 108359 is a mere sheet, so it is not easy to use, and in reality, it has no choice but to be used as a special sheet for preventing mold, bacteria, and insects, so there are problems such as how difficult it is to use depending on the food. Ta.

(Means for Solving the Problems) The present inventors have focused on solving these problems by mixing hinokitiol or (and) β-drabulin into a pressure-sensitive adhesive to form an adhesive tape or sheet. However, the present invention was completed as a result of research into how and in what amount hinokitiol or (and) β-dorabrin should be added.

Hinokitiol is a colorless to pale yellow crystal at room temperature and a solid with a melting point of 48 to 52.5 degrees Celsius, which becomes liquid at a relatively low temperature. β-Dorabulin is present in approximately the same amount as hinokitiol in the crude hinokitiol crystals extracted from Aomori Hiba, and is a solid that exhibits approximately the same structure and physical properties as hinokitiol. Both hinokitiol and β-drabulin have the so-called sublimation property of directly turning into gas without passing through a liquid state even at room temperature, so they can be retained in packaging materials as described above rather than being directly mixed into or in contact with food. It is clear that this effect can be achieved by covering or wrapping it. However, this is hinokitiol or β
- This is because drablin is in a state where it is easy to sublimate, that is, it is in contact with air, and if it is confined in another same phase, it will be inactive unless it is a substance that moves to the surface layer in the solid phase. It is possible.

The present inventor discovered that hinokitiol and/or β-drabulin migrate to the surface layer by diffusion in pressure-sensitive adhesives, and created an adhesive tape or sheet that is convenient to use.

According to the research conducted by the present inventor, it was found that if the content (solid content) of hinokitiol or (and) β-drabulin in the pressure-sensitive adhesive is not 0.5% or more, no obvious effect is exhibited. ing. In addition, there is a clear correlation between the content of hinokitiol or (and) β-drabulin in pressure-sensitive adhesives and the antifungal, antibacterial, and insecticidal effects of adhesive tapes or sheets. hinokitiol or (
and) It is desirable that the content of β-drabulin be as high as possible.

Therefore, the present invention is characterized in that the pressure-sensitive adhesive contains hinokitiol or (and) β-drabulin in an amount of 0.5% or more (solid content).

Note that, as described above, β-dorabrin is a substance that exhibits substantially the same structure and physical properties as hinokitiol, so the following explanation of hinokitiol is directly applicable.

Generally, adhesive tapes or sheets are manufactured through a process of coating a paper or plastic substrate with an adhesive. In this case, the coating material used is a solvent type adhesive, a water-based emulsion type adhesive, or a hot melt type adhesive.

Methods for adding hinokitiol into these pressure-sensitive adhesives include a method in which hinokitiol is directly dissolved, and a method in which hinokitiol is included in cyclodextrin or the like and dispersed as an clathrate.

The method of addition is determined by the fact that hinokitiol is easily soluble in organic solvents but difficult to dissolve in water, and the clathrate is difficult to dissolve in organic solvents, but is easily soluble in water and is resistant to heat. . The table shows the superiority of each method when the amount of hinokitiol added is constant. In addition, ○ in the adhesive type section of the table means that it is good, △ means that it is somewhat difficult to mix, × means that it is difficult to use, and ○ in the sections below quick-acting means that it is good. , Δ means not so good, and × means poor.

The inventor's tests have confirmed that when the content of hinokitiol is the same, when it is added as a clathrate for boat fishing, it is less effective than when it is added alone.

The base material used in the present invention can be either a breathable base material such as paper, non-woven fabric, or woven fabric, or a film base material such as a plastic film. In some cases, a breathable base material is suitable, and in cases where it is used by directly attaching it to fruits, etc., it is appropriate to adopt a film base material.

The adhesive tape or sheet of the present invention is used by being attached to the inner bottom surface, inner surface, etc. of a packaging container. Therefore, it is desirable that the packaging container has poor air permeability.

(Effects) The structure of the present invention is as described above, and since it is adhesive, it is easy and convenient to use.Moreover, it can be manufactured without changing the manufacturing process of ordinary adhesive tapes or sheets, so the manufacturing cost is reduced. It is inexpensive, mildewproofing and antibacterial for fresh foods in general,
It can be expected to have excellent effects such as being able to be used as an insect repellent.

(Example) The present invention will be explained in detail below.

Example 1 Natural rubber 100 parts Tackifying resin 77 parts Hinokitiol 3.5 parts Toluene 1200 parts Tackifying resin, hinokitiol, and natural rubber were added to toluene in this order at the above mixing ratio, and after 10 hours of stirring, a uniform coating was obtained. An adhesive for use was obtained. The content of hinokitiol in this adhesive was 1.94% as a solid content.

Apply this adhesive to medium-thick colored high-quality paper using a regular small coating machine.
It was dried to obtain a pressure-sensitive adhesive sheet with a coating amount (solid content) of about 15 g/d.

Example 2 1 part of cyclodextrin was dissolved in 53 parts of water, 0.14 part of hinokitiol was added thereto, and the mixture was heated and stirred at 60° C. After about 1 hour, a precipitate of the clathrate compound was obtained.

The mixture was allowed to stand at about 5 degrees Celsius for 5 hours to complete precipitation, followed by filtration under reduced pressure and drying under reduced pressure to obtain a clathrate powder. The content of hinokitiol in the obtained inclusion body powder was 12.3%.

100 parts of emulsion type acrylic adhesive (solid content: 42
%) of this hinokitiol/cyclodextrin clathrate, and by stirring, the clathrate was dissolved and a uniform emulsion-type adhesive for coating was obtained. The content of hinokitiol in this adhesive is a solid content ratio of 1
．． It is 72%.

Apply this adhesive to medium-thick color retention paper using a regular small coating machine.
It was dried to obtain a pressure-sensitive adhesive sheet with a coating amount (solid content) of about 15 g/d.

The adhesive tapes of Examples 1 and 2 above were pasted on the inner bottom and inner surface of cardboard and plastic containers, vegetables and fruits were placed there, and the results were left indoors to see if mold had formed or not by comparing it with a blank. I judged it. The results were as follows.

(1) Changes in freshness and speed of decomposition vary depending on the type of vegetables and fruits.
The degree of influence varies depending on the type of container.

(2) Comparisons cannot be made lightly as the factors contributing to spoilage are not simple, but if only mold growth is evaluated, the effect of hinokitiol is clear, and there is a clear correlation with the hinokitiol content in the adhesive. .

Claims (1)

[Claims] (1) In the pressure sensitive adhesive, hinokitiol or (and)
An adhesive tape or sheet for preventing mildew, germs, and insects on vegetables, fruits, etc., characterized by containing 0.5% (solid content) or more of β-Drabrin.