JP3841540B2 - Allyl isothiocyanate release sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can minimize the loss of allyl isothiocyanate (hereinafter referred to as AIT) during storage, and can ensure sufficient AIT release when placed in a high humidity state. , AIT release sheet.
[0002]
[Prior art and its problems]
Conventionally, AIT release sheets in which AIT is contained in a sheet material and AIT is released from the sheet material have been widely used as antibacterial and antifungal sheets for lunch boxes and fruits and vegetables.
[0003]
These AIT release sheets must be sealed and packaged before use so that AIT does not volatilize during storage.
[0004]
However, there is a problem that it is costly to seal and package the AIT release sheets one by one.
[0005]
In addition, if multiple AIT release sheets are packed together and stored in a sealed bag, the cost will be lower than if each AIT release sheet is taken out of the sealed bag. If it is not sealed, the AIT of the remaining AIT release sheet may be released during storage and cannot be used.
[0006]
On the other hand, if the AIT content in the AIT release sheet is less than 3%, the AIT release loss during storage can be reduced, but a sufficient AIT release amount cannot be ensured when necessary.
[0007]
By the way, AIT release sheets, such as lunch boxes and fruits and vegetables, are often used in a high humidity state where moisture exists on the sheet contact surface.
[0008]
Accordingly, the present invention is intended to provide an AIT release sheet that can minimize the loss of AIT release during storage and ensures sufficient AIT release when placed in a high humidity state. Is.
[0009]
[Means for Solving the Problems]
AIT release sheet according to the present invention, the content of AIT 3.0% or more, preferably 3.0 to 15%, rosin esters, resin acids, of the AIT-containing layer containing the fatty acid esters or EVA on both sides, the transmission regulation layer for regulating the transmission of the AIT is provided, at least one of the transmission regulation layer, 7.2 g / ^{m 2} or more, preferably viscose having a cellulose coating weight of 7.2~20g / ^{m 2} It is formed from processed paper.
[0010]
The AIT release sheet having the above structure is provided with a permeation restricting layer that restricts the permeation of AIT on both sides of the AIT containing layer having a content of 3.0% or more. Since it is regulated, long-term storage is possible even if the AIT content is 3.0% or more.
[0011]
And at least one of the permeation restricting layers on both sides was placed in a high humidity state by being formed of viscose processed paper having a cellulose coating amount of 5.0 g / m ² or more which is a moisture sensitive material. Only in the case, AIT is discharged through the permeation restricting layer of the viscose processed paper, and the function as an AIT release sheet is exhibited.
[0012]
The viscose-processed paper is a material obtained by coating paper / nonwoven fabric with viscose, which is a raw material of cellophane, and providing the cellulose layer on the paper / nonwoven fabric. This viscose-processed paper has the properties of paper / nonwoven fabric and cellophane, and exhibits the same gas permeation characteristics as cellophane when the cellulose coating amount is a certain amount or more. Cellophane has the unique property of being gas impermeable in the dry state but gas permeable in the high humidity state. A viscose-processed paper having a cellulose coating amount of approximately 5.0 g / m ² or more shows the same gas permeability as this cellophane and becomes a so-called moisture-sensitive material. Therefore, AIT does not pass in a state before sucking moisture, and has a property that the structure is loosened and the AIT passes by sucking moisture in a high humidity state.
[0013]
The permeation restricting layer of the viscose-processed paper does not need to be formed as a single layer, and may be formed as a plurality of layers. As an example of multi-layered viscose processed paper, rayon and pulp mixed nonwoven fabric are used as raw materials, unstretched polypropylene is laminated on one side with a polyethylene adhesive layer, and viscose solution is applied on the other side. Some of them are regenerated and desulfurized in an acid bath, washed with water and dried.
[0014]
In addition, examples of materials that are permeable to volatilized gas even in a high humidity state include PET, nylon, and aluminum, and this impermeable permeation restricting layer may be formed of a plurality of layers.
[0015]
Containing layer of the AIT is, rosin esters, resin acids, fatty esters or EVA to those in molten liquefied form, to create a mixed solution obtained by kneading AIT, the solution to produce a transmission regulation layer volatilization gas It can be formed by applying or impregnating a sheet. The content of AIT indicates the weight% of AIT in the mixed solution in which AIT is kneaded.
[0016]
【Example】
Example 1
An AIT release sheet that can be used as an antibacterial and antifungal sheet for lunch boxes and fruits and vegetables was formed as follows.
[0017]
First, 900 g of rosin ester and 50 g of phosphate ester were heated to 85 ° C. to form a molten liquid, and 45 g of AIT was added thereto and heated and kneaded for 10 minutes to prepare a mixed solution. By coating this AIT mixed solution on a 25 μm biaxially stretched polyester film to a coating thickness of 10 μm, a multilayer containing an AIT-containing layer on one surface of the permeation restricting layer of the biaxially stretched polyester film A material was formed.
[0018]
On the surface of the AIT-containing layer of the multilayer material, a viscose processed paper as a moisture-sensitive permeation restricting layer having the following constitution was further laminated to form an AIT release sheet according to the present invention.
[0019]
The viscose-treated paper layer is made of a rayon / pulp mixed nonwoven fabric (mixing ratio 30:70) having a basis weight of 14 g / m ² , and 20 μm of unstretched polypropylene via a polyethylene adhesive layer (15 μm) on one side. The other side is coated with a viscose solution (cellulose concentration 4.0%, alkali concentration 1.9%) with a roll coater, regenerated and desulfurized in a sulfuric acid bath, washed with water and dried with a cylinder dryer. A multilayer structure having a cellulose coating amount of 5.0 g / m ² was used.
[0020]
When the volatile drug release sheet of Example 1 was placed in a high humidity state of 65% humidity and 95% humidity, the release behavior of AIT was tested at 20 ° C. and 30 ° C., respectively. As shown in the graph, it was confirmed that the AIT release sheet of Example 1 has a low release amount regardless of the temperature when the humidity is low, and has an AIT release ability when placed in a high humidity state.
[0021]
(Example 2)
The AIT release behavior was tested in the same manner as in Example 1 except that the cellulose concentration of the viscose solution was 5.0% and the cellulose coating amount was 7.2 g / m ^{2. The} results shown in FIG. was gotten.
[0022]
Example 3
On the viscose processed paper obtained in Example 2, a viscose solution (cellulose concentration 3.0%, alkali concentration 1.9%) was further coated with a roll coater, regenerated and desulfurized in a sulfuric acid bath, When the AIT release behavior was tested in the same manner as in Example 1 with respect to a cellulose application amount of 10.5 g / m ² after washing with water and drying with a cylinder dryer, the results shown in FIG. 3 were obtained.
[0023]
【The invention's effect】
As described above, the AIT release sheet according to the present invention can minimize the release loss of AIT during storage by the permeation regulation layer, and when placed in a high humidity state, There is an effect that the structure is loosened and sufficient AIT release can be secured.
[Brief description of the drawings]
[1] Cellulose graph 2 shows cellulose coating amount indicating the release behavior of the AIT with humidity and temperature changes in the coating amount is 5.0 g / m ² der Ru A IT release sheet is 7.2 g / m ² FIG. 3 is a graph showing AIT release behavior according to changes in humidity and temperature of the AIT release sheet according to the present invention. FIG. 3 shows AIT according to changes in humidity and temperature of the AIT release sheet according to the present invention in which the cellulose coating amount is 10.5 g / m ^2. Graph showing the release behavior of

Claims (1)

The content of allyl isothiocyanate is Ru der least 3.0%, rosin ester, on both sides of the resin acids, allyl isothiocyanate-containing layer containing the fatty acid esters or EVA, transmission regulation layer for regulating the transmission of allyl isothiocyanate An allyl isothiocyanate release sheet characterized in that at least one of the permeation restricting layer is formed of viscose processed paper having a cellulose coating amount of 7.2 g / m ² or more.

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