JPS61151288A - Self-adhesive sheet package - Google Patents

Abstract

PURPOSE:To provide a self-adhesive package consisting of a bag with a releasable inner surface and containing a self-adhesive sheet with self-adhesive layers at least one of which is exposed to air, which has a consistent quality and an excellent sterilizing effect without the need of any release paper. CONSTITUTION:Two sheets 10, 11 of polyethylene, cellophane, etc. coated on one or both sides with 0.05-2.0g/m<2> release agent such as silicone resin and heated to 130 deg.C or higher for curing are laid one on top of the other, with release surfaces 100 facing each other. A self-adhesive sheet 3 prepared by forming a self-adhesive layer having a glass transition point of -20--60 deg.C, is inserted between the above sheet 10, 11 and bonded together in a predetermined area S by hot sealing or with a hot-melt adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure-sensitive adhesive sheet package, and particularly to a pressure-sensitive adhesive sheet package that can eliminate the conventional concept of adhering a release paper to the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet.

(Prior art) There is one product group collectively called adhesive sheet, for example,
As shown in Japanese Patent No. 115480, a release paper is applied to the surface of all adhesive layers without exception.

This is because if a product is made with the adhesive layer exposed, everything that comes into contact with it will stick to it, and it will not be able to function as an adhesive sheet.

If such a release paper is attached to the surface of the adhesive layer of an adhesive sheet, the following problems will arise that are fatal to the adhesive sheet: ■ When using an adhesive sheet, the first step is to remove the release paper. It is essential. If the release paper is strongly adhered to the surface of the adhesive layer or the quality of the release paper is poor, the work will be extremely difficult. As a result, the edges of the adhesive sheet become deformed, wrinkled, and soiled. If the adhesive sheet is for medical aid or treatment, it cannot be used.

■ When Adhesive Shift is used for medical purposes, especially for products that are applied directly to skin wounds, each adhesive sheet must be sterilized with ethylene oxide gas (EOG) while each sheet is stored in its packaging. Processing is done. Although EOG passes through the package, it requires strong treatment conditions to pass through the release paper on the adhesive sheet and reach the adhesive sheet.

If the release paper is made of a gas-impermeable sheet such as polyethylene resin, polyethylene terephthalate resin, orientated polypropylene (OPP), or a paper base material made by laminating these sheets, EOG can pass through this. Sterilization by EOG becomes impossible. In such a case, therefore, heat sterilization treatment at 130° C. or higher or sterilization treatment using radiation such as cobalt-60 must be performed. Many pressure-sensitive adhesive sheets are damaged by such harsh treatment.

■ Since the release paper is adhered to the surface of the adhesive layer by mechanical pressure such as a pressure roll, the adhesive force increases due to oral changes, which makes the peeling process extremely difficult and causes the above-mentioned ■
This results in the problem mentioned in . As mentioned in ① above, in order to enable EOG sterilization of the release paper, it was not possible to treat the surface with resin, so a release treatment such as silicone coating was applied directly onto the paper base. Because adhesives are used, such problems of adhesive agitation are likely to occur.

■ Release paper accounts for at least several tens of percent of the total cost of a product, and is a major factor that puts pressure on cost.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and its purpose is to create a structure that does not require a release paper to be attached to the adhesive layer of an adhesive sheet. An object of the present invention is to provide an adhesive sheet package having the following features. Another object of the present invention is to provide a pressure-sensitive adhesive sheet package that can improve usability, quality stability, sterilization, economic efficiency, etc. of the pressure-sensitive adhesive sheet.

(Means for Solving the Problems) The present invention has a feature in that the inner surface of the package is subjected to a peeling treatment, and the peeled surface is made to function as a release sheet for the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet.

The pressure-sensitive adhesive sheet package of the present invention includes at least one pressure-sensitive adhesive sheet composed of a pressure-sensitive adhesive layer with at least one side exposed, so that at least one surface of the pressure-sensitive adhesive layer is removable from the pressure-sensitive adhesive layer. The above object is achieved by storing the bag body so as to face the peeling surface of the bag body.

(Example) The present invention will be described below with reference to examples.

As shown in FIGS. 1 and 2, the adhesive sheet package 1 of the present invention is composed of two sheet materials 10 and 11. Predetermined areas S around the four sides of these sheet materials 10 and 11 are joined by an adhesive method such as heat melt sealing or hot melt adhesive. A small amount of sheet material (for example, one sheet material).

The inner surface 100 of 10 has been subjected to a peeling treatment in advance. This package 1 has an adhesive sheet 2 with its adhesive layer 21.
It is enclosed with its side facing the peel-treated surface 100 of the package 1.

It goes without saying that the area surrounded by the four-sided seals S of the package 1 is larger than the adhesive sheet 2. It is necessary that the adhesive strength of the four-sided seal portion S is such that when the end portion of the package 1 is opened with fingers, the sheet materials 10 and 11 constituting the package 1 can be opened without being damaged. Further, the peel-treated surface 100 is smaller than the area surrounded by the four-sided seal portion S, and larger than the adhesive sheet 2.

There are no particular restrictions on the material used for the sheet materials 10 and 11, and any material that is normally used as a packaging material can be used. The most typical material is paper.

It is preferable that the sheet material 10 to be subjected to the peeling treatment is a dense paper or paper laminated with polyethylene or the like so that the peeling treatment can be effectively performed.

The quality of paper varies widely, but if the product is to be sterilized, use high-density kraft paper, parchment paper, parchment paper, or one whose surface is coated with resin to prevent bacteria from entering after sterilization. is desirable.

Furthermore, when sterilization is performed by EOG, thick resin processing on the surface should be avoided in order to maintain gas permeability. Other materials include cellophane, polyethylene, polypropylene, and nylon.

Polyester, rigid polyvinyl chloride, aluminum foil, or the like can be used as a single material.

In addition to the above-mentioned single material group, it is also possible to use different types of films or laminated materials made of films and aluminum foil or the like.

Laminates of paper and films can also be used. others,
As a unique sheet material.

There is a plastic sheet with fine continuous ventilation holes.

Such sheets are impermeable to bacteria but permeable to gases such as EOG. The surface can also be subjected to a release treatment using silicone or the like.

The sheet materials 10 and 11 may be made of the same material or different materials.

To perform a release treatment on the inner surface of the sheet material 10, a release agent is applied to a predetermined portion of the sheet material by printing means when the sheet material is in a single sheet state before being made into a bag. When the release agent is silicone, for example, a 5-30 weight percent solution or a 30-60 weight percent emulsion of silicone resin (high-speed cure type release grade) has a solid resin content of 0.05-2.0 g.
/m'' on the sheet material 10, dried, and cured by passing through a heated oven at 130°C or higher.The release agent is polyfluorinated ethylene-based or long-chain alkyl group. If it is a polymer system with side chains.

After drying, it is immediately subjected to the ninth processing without going through a curing process. However, even silicone release agents are UV-curable,
Alternatively, when an electron beam curing type is used, the curing treatment can be easily performed by passing it through an ultraviolet ray irradiation device or an electron beam irradiation device instead of passing it through the heating oven described above.

As a remover.

Other examples include random systems such as polyacrylic acid ester systems having fluorinated alkyl groups and graft or block copolymers of polyfluorinated ethylene.

There are no particular restrictions on the material of the adhesive layer 21 constituting the adhesive sheet 2, and any material commonly used as an adhesive can be used. There are two main types of adhesives: non-hydrophilic adhesives and hydrophilic adhesives. Non-hydrophilic adhesives include 1.For example, natural rubber/resin (tackifier)
Compound system, natural rubber styrene-butadiene rubber (S B
R) ・Resin compound system, ABA type block copolymer (or this and natural rubber), resin/plasticizer compound system, polyvinyl alkyl ether system, polyisobutylene system, acrylic ester polymer or copolymer system, or silicone system. There is an adhesive. As a hydrophilic adhesive9, for example, a composition in which a plasticizer such as glycerin, diglycerin, etc. is added to a polymer or copolymer of vinyl pyrrolidone, a polymer or copolymer of acrylic acid, a polyvinyl alcohol derivative, etc. There is something like that. The glass transition point of any adhesive is from 160℃ to 120℃2, usually -45℃.
It is necessary that the temperature is between -30°C and -30°C.

There are no particular restrictions on the material of the base sheet 20 constituting the adhesive sheet 2, and any material commonly used as a base material for adhesive sheets can be used. These include, for example, 9 fibrous substrates made of paper, nonwoven fabric, cloth, etc. The materials constituting these fibrous base materials include cellulose obtained from natural products and extensible or non-extensible synthetic fibers. It is also possible to use non-fibrous materials, for example rigid or flexible polyvinyl chloride.

Polypropylene, polyethylene, ethylene/vinyl acetate copolymer, saponified polyvinyl acetate, partially acetalized polyvinyl acetate after saponification.

Cellulose acetate, polyester nylon, polyurethane, polyamide, polyurethane/polyamide cocondensate 2 synthetic rubbers 2 foamed plastics.

These are used as a single material. It is also possible to use a composite sheet (or a laminated sheet) made by combining two or three of these various materials. An example of a combination substrate is a highly extensible film made by a casting method, such as a polyurethane film.

In the casting method, the film is generally formed by coating and drying on a mount called process paper.

A polyurethane film is obtained in close contact with the process paper. Since the polyurethane film is very stretchable when used alone, it is preferable to use it as it is without removing the processing paper. The process paper is indicated at 22 in the figure.

The adhesive sheet 2 is manufactured as follows. An adhesive solution or dispersion is directly applied to the base sheet 20 and dried (
This is generally referred to as coating) (direct coating), or one surface is coated on a process paper with releasability, and then transferred to the surface of the base material (transfer coating). Coated by any means.

In a second step, the base material coated with the adhesive is subjected to cutting, etc., to be finished into a desired adhesive sheet. When transfer coating is employed, it is preferable to peel off the processing paper before cutting.

For example, two pressure-sensitive adhesive sheets were obtained in this way.

Enclosed within the packaging of the present invention as follows: First,
The adhesive sheet 2 has an adhesive layer 21 on the sheet-like material 10.
It is placed so as to be in contact with the peel-treated surface 100 of. Next, an adhesive is applied along the sealing area S at the periphery of this sheet material 10, and the other sealing material 11 is placed on top of this with the inner surfaces aligned, and the sealing areas S are then bonded and sealed. do.

Then, the excess outer periphery is cut and removed as necessary.
A package 1 enclosing the adhesive sheet 2 is obtained. This package 1 is then subjected to a blanking process, if necessary.

There are 9 methods of sterilization, such as EOG sterilization, heat sterilization, and radiation sterilization.

As mentioned above, EOG treatment is also desirable in order to minimize or eliminate damage to the adhesive sheet 2 inside the package 1.

Since the present invention does not require a conventional release paper that impedes the permeation of EOG, sterilization can be performed extremely quickly and effectively under mild processing conditions.

Another embodiment of the adhesive sheet package 1 of the present invention is shown in FIGS. 3 and 4.

The package 1 in this case is formed by folding a single sheet material 10 in half and adhering and sealing the folded sheet at the seal areas S at the three edges.

At least one of its inner surfaces is subjected to a releasable treatment as in the previous embodiment. Its material and peeling treatment method are also the same as in the previous embodiment. The method for enclosing the adhesive sheet 2 into the package 1 can also be done in accordance with the embodiment described above. Sterilization treatment after encapsulating the adhesive sheet 2 can also be performed in the same manner as in the previous embodiment. As shown in FIG. 6, it is also possible to fold a single adhesive sheet 2 into the package 1 so that its adhesive layer 21 runs along the inner surface of the package and then enclose it.

In this case, it goes without saying that both the upper and lower inner surfaces of the package 1 are subjected to a releasable treatment.

Still another embodiment of the package is shown in FIG. In this case, the package 1 has upper and lower inner surfaces forming a release-treated surface 100, and two adhesive sheets 2, 2 are enclosed with their respective adhesive layers 21 facing the release-treated surface 100. It can be done. All other points are the same as the package of the embodiment shown in FIG.

A specific example in which an adhesive sheet is enclosed in the package shown in FIG. 1 will be described below.

Preparation of adhesive sheet> ■ Base sheet: Polyether-based polyurethane film (thickness 35 μm) was coated by casting coating method.
A film was formed on the polypropylene surface of a process paper made of a kraft paper/polypropylene laminate. With the process paper still attached, it is subjected to the adhesive coating process described below.

(2) A slightly cross-linked polymer consisting of butyl nitacrylate alone was used as an adhesive. Its average molecular weight is as follows.

Mn = 7.9 x 10' Mw = 58. I X 10' Mz = 113.0 X 10' ■ Preparation of adhesive sheet: The above adhesive was diluted with ethyl acetate.
% solution by weight, and this solution was cast and coated on a silicone release-treated process paper specifically for adhesive coating.
An adhesive layer having a thickness of 25 μm after drying was obtained. This pressure-sensitive adhesive layer surface and the polyurethane surface of the base sheet (with processing paper) were pressed together through two pressure rolls. Then,
Only the process paper used for adhesive coating was removed. Then, it was cut to obtain an adhesive sheet 2 having a size of 100 g, 11 x 25 Qm.

Packaging material> ■ Sheet material One side of a stretched polypropylene film with a thickness of 40 μm (the side to be subjected to release treatment) was first subjected to a corona discharge treatment.9Then, the portion to be subjected to release treatment (120n
210x*) was coated using a printing method using a silicone treatment agent for adhesive release (Shin-Etsu Silicone KS772), and the coating amount after drying was 0.8 g/rd.
It was applied, dried, and cured, and then wound up into a roll. In this way, the seal material 10 on the side having the releasably treated surface was obtained. The seal material 11 on the side that does not have a releasable treated surface has a weight of 9 per m'.
0g dense raft paper was used.

<Insertion of adhesive sheet/bag making> While rewinding the releasably treated surface 100 of the sheet material 10 of the packaging material upward, the adhesive sheet 2 is placed on this surface with its adhesive layer 21 facing. I'll leave it there.

Subsequently, the sheet material 11 of the packaging material is applied from the opposite side of the package material 5. Then, a polyvinyl acetate adhesive is applied to a portion corresponding to the seal area S.

When this adhesive is slightly dry, this sheet-like material 11 is laminated onto the sheet-like material 10 while aligning each seal area S. Next, the bonded portion is air-dried or dried by heating. Then, cutting was performed individually along the seal area S to obtain a desired package. The size of the bag was 150x*300m. The width of the seal w4 area S is approximately 3 fins, and the outside of the seal area S is 14Qmm x 2
It was 90m.

end of fire <Preparation of adhesive sheet> ■ Base sheet: Same as Experimental Example 1.

■ Adhesive: Same as Experimental Example 1.

(2) Preparation of adhesive sheet: Using the same method and conditions as in Experimental Example 1, an adhesive was coated on a process paper, and the resulting adhesive layer surface and the polyurethane film surface of the base sheet were pressed together.

Next, process paper specifically for adhesive coating was collected. A new protective release paper (kraft paper laminated with 30 g of polyethylene on one side and silicone release treatment applied on top) is placed on top of the adhesive layer, and the pressure roll is applied again. pressed through. Then,
This was cut into a size of 100+m x 250m, and another release paper was laminated on top of the resulting adhesive sheet to produce an adhesive sheet body.

G <Package Material> All sheet materials 10 and 11 are the same as in Experimental Example 1. However, no releasability treatment was applied to any of the inner surfaces of the sheet material.

<Insertion of Adhesive Sheet/Bag Making> The sheet material 11 of the packaging material was laid flat, and the same adhesive as in Experimental Example 1 was applied to the area corresponding to the preset sealing area S. Next, the pressure-sensitive adhesive sheet body was placed at its center, and the sheet material 10 of the packaging material was accurately pasted thereon with its corona discharge treated surface facing downward.

After the adhesive was air-dried or heated and dried, it was cut at the outer periphery of the seal area S in the same manner as in Experimental Example 1, to obtain a completely sealed package of one adhesive sheet. Its size is the same as in Experimental Example 1.

<EOG sterilization treatment> A plurality of adhesive sheet-enclosed packages obtained in Experimental Example 1 and Comparative Example 1 were subjected to sterilization treatment under the following treatment conditions.

■ EOG composition: ethylene oxide gas/carbon dioxide gas-
10/90 (volume ratio) ■ EOG pressure Crab First, the vacuum was evacuated to 2 mm and 11 g, and then the pressure was set to 1.0 atm using EOG.

■ Processing temperature: 40'C ■ Processing time: 30 minutes and 2.4.6 hours for each L <Sterilization test results> After sterilization, 60''c・6o%RH condition 2
Accelerated aging was performed for 0 days. and.

The usability, adhesion, and sterilization effectiveness of each were investigated.

The results are shown below.

(Left below) ■ Usability ■ Adhesion (Duck value) Basically, the pharmaceutical manufacturing guidelines (1984 edition, p. 9, 51-
52), the method for testing the adhesion of bandages, etc., and the steel ball method was adopted. However, the length of the adhesive surface was corrected to 150, and the adhesiveness was compared using the number of the largest steel ball that stopped at the lower end (the larger the number, the greater the adhesiveness). The test results are shown as the average of three measurements (15 measurements in total) of sample packages processed under each of the five sterilization conditions, with the location on the adhesive surface of each adhesive sheet changed in the horizontal direction. has been done.

The processing paper for the polyurethane film on the back remained attached. The average value of the samples in Experimental Example 1 was 12. The average value of the samples of Comparative Example 1 was 9.

Met.

As this tackiness test shows, the sample of Comparative Example 1, which has a conventional form, has decreased tackiness. This is considered to be due to the fact that part of the release agent from the protective release paper, which had been closely adhered to the surface of the adhesive layer, migrated to the surface of the adhesive layer.

■ Sterilization effect The sterilization effect was compared by a bacterial growth test on a nutrient agar culture medium. Aseptically, from each sample of Experimental Example 1 and Comparative Example 1 that were subjected to sterilization under the above five conditions,
Cut out one 2 cm x 2 cm test piece with only the adhesive sheet body 2 (therefore, in the sample of the comparative example).

(The protective release paper was peeled off), and each sheet was placed on an agar medium with the adhesive layer facing down. After applying a top lid, culture was performed at 35° C. for 70 hours, and the state of growth of various bacteria on the surface of the medium was observed. The results are shown in the table below.

As is clear from the table, the 9 samples according to the present invention have a significantly better sterilization effect using F and OG than the conventional samples.

(Effects of the Invention) According to the present invention, a pressure-sensitive adhesive sheet package is provided that does not require a protective release paper, which is indispensable for conventional pressure-sensitive adhesive sheets. By using this package, the usability, quality stability, sterilization, economic efficiency, etc. of the adhesive sheet enclosed therein are significantly improved.

The effects that can be achieved are listed as follows: ■ The package can be used as an adhesive sheet immediately after opening. In contrast, the conventional type cannot be used without further removing the release paper after opening the package. In that case, the following problems occurred. - (i) #JL The effort or difficulty at the beginning.

(ii) Deformation or staining of the sheet edge due to this.

't iii) Because the release sheet and the adhesive surface are strongly adhered.

・Transition of adhesive to release paper ・Stretching of adhesive sheet ・Delamination of release paper, etc.

According to the present invention, all of these conventional problems are solved.

■ The adhesive sheet inside the package is intentionally lightly pressed against the inner surface of the package, resulting in a very light adhesive state. Therefore, only the adhesive sheet can be easily peeled off after opening.

■ EOG sterilization is achieved in a very short time and/or under mild conditions. In contrast, EOG sterilization is lengthy or impossible in conventional configurations. Since EOG sterilization is impossible, high heat sterilization, radiation sterilization, etc. are unavoidably performed, but this damages the adhesive sheet. Such problems cannot occur with the packaging of the present invention.

(2) Due to the reason (2) above, in the embodiment of the present invention, the stickiness does not decrease even after long-term storage, regardless of whether it is in summer or winter. On the other hand, for conventional products.

Due to the influence of the release agent of the release paper that is closely adhered to the surface of the adhesive layer, its adhesive strength may be significantly reduced, resulting in a loss of practicality.

4. Figures 1 and 2 are a front cross-sectional view and an explanatory view showing a partially unsealed state of an embodiment of the adhesive sheet package 1 of the present invention, and Figures 3 and 2 are respectively FIG. 4 is a front sectional view and an explanatory diagram of a partially unsealed state of another embodiment, respectively, and FIGS. 5 and 6 are front sectional views of still another embodiment, respectively.

1... Adhesive sheet package, 2... Adhesive sheet), 10
゜11... Sheet material, 20... Base sheet, 21
...adhesive layer.

100...Peeling treated surface, S...Seal area.

that's all

Claims (1)

[Claims] 1. At least one pressure-sensitive adhesive sheet composed of a pressure-sensitive adhesive layer with at least one side exposed, the pressure-sensitive adhesive sheet having at least one inner surface that has releasability with respect to the pressure-sensitive adhesive layer. A pressure-sensitive adhesive sheet package is housed so as to face the peeling surface of a bag that has been treated to have the same properties. 2. The adhesive sheet package according to claim 1, wherein the adhesive sheet is an adhesive sheet for medical aid or treatment.