JP2009256395A - Sealing self-adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-adhesive tape usable for a joint part and a sealing part of a transparent easily-disposable gas-barrier film to be used for a packing bag. <P>SOLUTION: In the sealing self-adhesive tape 12, a vapor deposition thin film layer 3 formed of a metal, an inorganic oxide or a mixture of them, a coating film layer 4 formed of a coating agent principally consisting of an aqueous solution or a water/alcohol mixture containing a water-soluble polymer and at least one of (a) one or more kinds of alkoxide and/or its hydrolyzate and (b) tin chloride, and an adhesive layer 5 are layered on at least one side of a plastic substrate 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive film having a gas barrier property, and particularly to a pressure-sensitive adhesive tape having a gas barrier property used for sealing a gas-barrier packaging container used in the packaging field of foods, daily necessities, electronics-related parts and pharmaceuticals.

  Some products such as foods, daily necessities, electronics-related parts, and pharmaceuticals may deteriorate in quality due to oxygen, water vapor, etc. in the air. These products are used in packaging bags and packaging containers made of resin films with gas barrier properties. It is sealed and stored until use. This packaging bag has a size that can accommodate the product, and a heat-sealable resin layer is formed on the inner surface of the packaging bag. After storing the product, the mouth portion of the packaging bag is heat sealed by heating and pressing. Sealed. Or when not heat-sealing, adhesive etc. are apply | coated to the opening | mouth part of a packaging bag, and it seals and seals by press.

  In the case of a container, the resin container and the lid are sealed by heat sealing by heat pressing at a portion to be sealed, for example, a flange portion. Alternatively, when heat sealing is not performed, a method of sealing with an adhesive tape has been implemented, but the adhesive tape used for sealing is an adhesive tape with poor gas barrier properties such as paper tape, vinyl chloride tape, polypropylene tape, cellophane tape, etc. Therefore, problems such as inflow of oxygen and water vapor from the outside, and sealing of a container in which the air inside the container has been replaced with a gas replacement package such as nitrogen gas, permeates the base material of the adhesive tape and causes the outflow of the replacement gas or outside the container. Oxygen and water vapor flowed in and the gas replacement effect was lost.

  Therefore, it is disclosed that the flange portion of the container and the lid is sealed with a gas barrier adhesive tape composed of a resin layer containing a gas barrier resin or a base layer having a gas barrier property made of an inorganic substance and an adhesive layer. (See Patent Document 1).

  Also, packaging fields and electronic equipment members that require a high water vapor barrier, such as adhesive films with high gas barrier properties for packaging used in the packaging field of food / daily necessities, electronics-related parts and pharmaceuticals, etc. As a pressure-sensitive adhesive film having a high gas barrier property used in the above field, a pressure-sensitive adhesive film having a high gas barrier property provided with a laminate in which vapor-deposited thin film layers and intermediate coating layers are alternately laminated on one side of a base material made of a plastic material (See Patent Document 2).

  Furthermore, the barrier intermediate layer is composed of a heat sealable outer layer directly or indirectly laminated on both sides of the barrier intermediate layer, and oxygen scavenging is provided between at least one of the barrier intermediate layer and the heat sealable outer layer. It is a sealing tape and paper container provided with an oxygen scavenging layer to which an agent is attached / attached, and prevents the barrier property from being impaired from the end surface of the container wall formed by overlapping the edges of the packaging material. Further, it is disclosed that a complete barrier property can be imparted to the entire container, and leakage and penetration of liquid food from the sealing tape fixing part can be prevented (see Patent Document 3).

Furthermore, a base film made of a plastic film is used as an adhesive film that can maintain gas barrier properties with little reduction in gas barrier properties even when subjected to a physical load such as pulling that occurs every time the container outlet is opened and resealed. And an inorganic oxide vapor deposition film formed on at least one surface thereof, and a general formula R1nM (OR2) m formed on the inorganic oxide vapor deposition film (wherein R1 and R2 are organic groups having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence) at least one alkoxide, polyvinyl alcohol resin, and / or Viscosity comprising a barrier coating film comprising an ethylene-vinyl alcohol copolymer and further coated with a coating material comprising a barrier composition obtained by polycondensation by a sol-gel method. Adhesive film comprising a film substrate and the adhesive layer is disclosed (Patent Document 4).
JP2003-246973 JP2004-276294 JP2004-211040 JP2008-23927

However, the gas barrier adhesive tape of Patent Document 1 is a resin layer having a gas barrier resin or an inorganic substance in layers, and the gas barrier resin has a weak gas barrier property and also has an inorganic substance. In the case of the layered structure, the gas barrier property may be deteriorated due to physical inability such as bending or bending of the adhesive tape on the tape attaching surface.
Patent Documents 2 and 4 are adhesive films, but they are not used for adhering to a joining portion of gas barrier films or adhering to a joint between a gas barrier container and its lid material.
Moreover, patent document 3 is a sealing tape used for adhesion | attachment of the edge part of a paper container base material, and was not what joins gas barrier films from the outside by the adhesion layer.

  Then, this invention makes it a subject to provide the adhesive tape which can be used for the joint line and sealing part of the film which has a gas barrier property, transparency, and easy disposal property used for a packaging bag.

In order to solve the above problems, the invention of claim 1 of the present invention provides:

On at least one surface of the plastic substrate, a vapor-deposited thin film layer that is a metal or an inorganic oxide or a mixture thereof, a water-soluble polymer and (a) one or more alkoxides and / or hydrolysates thereof or (b) tin chloride A sealing pressure-sensitive adhesive tape comprising an aqueous solution containing at least one of them, or a film layer made of a coating agent mainly composed of a water / alcohol mixed solution and an adhesive layer .

  The invention according to claim 2 of the present invention is characterized in that in the sealing adhesive tape according to claim 1, two or more deposited thin film layers and multiple layers are laminated.

  A third aspect of the present invention is the sealing adhesive tape according to the first or second aspect, wherein the deposited thin film layer is a metal such as aluminum, copper, silver, or yttrium tantalum oxide, aluminum oxide, silicon oxide, magnesium oxide. Inorganic oxides such as or a mixture thereof.

  The invention of claim 4 of the present invention is characterized in that, in the sealing adhesive tape of claim 1 or 2, the metal alkoxide is tetraethoxysilane, triisopropoxyaluminum, or a mixture thereof. is there.

  According to a fifth aspect of the present invention, in the sealing adhesive tape according to the first or second aspect, the water-soluble polymer is polyvinyl alcohol.

  According to a sixth aspect of the present invention, in the sealing pressure-sensitive adhesive tape according to the first or second aspect, a plastic film layer having a gas barrier property is laminated between the coating layer and the pressure-sensitive adhesive layer. Is.

  According to a seventh aspect of the present invention, in the sealing adhesive tape according to any one of the first to sixth aspects, the release layer is formed on the outermost surface side, and the adhesive layer is wound up so as to be in contact with the release layer. It has a roll shape.

  According to an eighth aspect of the present invention, in the sealing adhesive tape according to any one of the first to seventh aspects, an oxygen absorbent is attached to or mixed with the adhesive layer.

  The pressure-sensitive adhesive tape for sealing of the present invention comprises, on at least one surface of a plastic substrate, a vapor-deposited thin film layer, a water-soluble polymer and (a) one or more alkoxides and / or its water, which are metals or inorganic oxides or a mixture thereof. Since a coating layer and an adhesive layer made of a coating agent mainly composed of an decomposed product or (b) tin chloride or a water / alcohol mixed solution are laminated, a high gas barrier property is maintained. Even if it is used for laminating films and sheets having gas barrier properties, the gas barrier properties can be maintained, and the gas barrier properties can be maintained by using them in gas barrier packaging bags, boxes, containers, etc. . Moreover, a highly practical pressure-sensitive adhesive tape having higher gas barrier properties can be obtained by attaching, adhering, or mixing an oxygen absorbent to the pressure-sensitive adhesive.

  The present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of the sealing adhesive tape of the present invention.

  First, a sealing pressure-sensitive adhesive tape 1 of the present invention shown in FIG. 1 is a film base material in which a base material 2 is made of a plastic material, and a vapor-deposited thin film layer 3, a coating layer 4, and an adhesive layer 5 are sequentially laminated on one side. Yes.

The plastic material of the base material 2 is, for example, a polyester film such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), a polyolefin film such as polyethylene or polypropylene, a polystyrene film, a polyamide film, a polycarbonate film, a polyacrylonitrile film, a polyimide. A film or the like can be used. These may be stretched or unstretched as long as they have mechanical strength and dimensional stability. Usually, these are processed into a film and used. In particular, a polyethylene terephthalate film or nylon film arbitrarily stretched in the biaxial direction from the viewpoint of heat resistance or the like is preferably used.
Further, various known additives and stabilizers such as an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant are used on the surface of the substrate 2 opposite to the surface on which the deposited thin film layer 3 is provided. May be. Further, in order to improve the adhesion with the deposited thin film layer 3, any treatment such as corona treatment, low temperature plasma treatment, ion bombardment treatment, chemical treatment, solvent treatment, etc. is performed with the laminated surface side of the substrate 2 as a pretreatment. You may give it.

  The thickness of the substrate 2 is not particularly limited, and a film obtained by laminating films having different properties other than a single film can be used in consideration of suitability as a substrate. In consideration of workability, the range of 3 to 200 μm is preferable, and 6 to 30 μm is particularly preferable.

  In consideration of mass productivity, it is desirable to use a long continuous film capable of continuously forming each layer.

  Next, the deposited thin film layer 3 is made of a deposited film of a metal such as aluminum, copper, silver, or an inorganic oxide such as yttrium tantalum oxide, aluminum oxide, silicon oxide, magnesium oxide, or a mixture thereof, such as oxygen, water vapor, etc. It has a gas barrier property. Among these, aluminum, aluminum oxide, silicon oxide, and magnesium oxide are particularly preferable. Note that the material is not limited to the above-described metals and inorganic oxides, and any material having gas barrier properties such as oxygen and water vapor can be used.

  The optimum thickness of the vapor-deposited thin film layer 3 varies depending on the type and configuration of the compound used, but is preferably in the range of 5 to 300 nm, and the thickness can be appropriately selected. However, when the film thickness is less than 5 nm, a uniform film cannot be obtained and the film thickness is not sufficient. In the case of an inorganic oxide, when the film thickness exceeds 300 nm, the thin film cannot exhibit flexibility, and the thin film may be cracked due to external factors such as bending and pulling after the film formation. Preferably, it exists in the range of 10-150 nm.

As a method of forming the vapor deposition thin film layer 3 on the plastic substrate, it can be formed by a normal vacuum vapor deposition method. Further, as other thin film forming methods, a sputtering method, an ion plating method, a plasma vapor deposition method (PCVD), or the like can be used. Considering productivity, the vacuum deposition method is the best at present.
As a heating means of the vacuum deposition method, any of an electron beam heating method, a resistance heating method, and an induction heating method is preferable.
Moreover, in order to improve the adhesiveness of the vapor deposition thin film layer 3 and the base material 2, and the denseness of the vapor deposition thin film layer 3, it is also possible to vapor-deposit using a plasma assist method or an ion beam assist method. Further, in order to increase the transparency of the deposited film, reactive deposition by blowing oxygen gas or the like may be performed during the deposition.

  Further, the coating layer 4 that is the second layer forming the gas barrier layer will be described. The coating layer 4 is mainly composed of a water-soluble polymer and an aqueous solution containing at least one of (a) one or more alkoxides and / or hydrolysates or (b) tin chloride, or a water / alcohol mixed solution. It is formed using a coating agent. For example, a solution in which a water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which a metal alkoxide is directly or previously hydrolyzed is mixed. Adjust to make a solution. After coating this solution on the vapor deposition thin film layer 3 which consists of mineralized oxide, it heat-drys and forms.

Examples of the water-soluble polymer used in the coating agent include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. In particular, when polyvinyl alcohol (PVA) is used, the gas barrier property is most excellent. This PVA is generally obtained by saponifying polyvinyl acetate and includes from so-called partially saponified PVA in which several tens percent of acetic acid groups remain to complete PVA in which only several percent of acetic acid groups remain. There is no particular limitation.

The tin chloride used for the coating agent may be stannous chloride (SnCl ₂ ), stannic chloride (SnCl ₄ ), or a mixture thereof. These tin chlorides may be anhydrous or hydrated.

Furthermore, the metal alkoxide used for the coating agent is a compound represented by the general formula, M (OR) n (M: metal such as Si, Ti, Al, Zr, R: alkyl group such as CH ₃ , C ₂ H ₅ ). is there. Specific examples include tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ] and triisopropoxyaluminum [Al (O-2′-C ₃ H ₇ ) ₃ ], among which tetraethoxysilane and triisopropoxy. Aluminum is preferable because it is relatively stable in an aqueous solvent after hydrolysis.

  As long as the gas barrier properties of the coating agent are not impaired, known additives such as isocyanate compounds, silane coupling agents, or dispersants, stabilizers, viscosity modifiers, and colorants can be added as necessary.

  For example, the isocyanate compound added to the coating agent is preferably one having two or more isocyanate groups in the molecule. For example, monomers such as tolylene diisocyanate, triphenylmethane triisocyanate, tetramethylxylene diisocyanate, and polymers and derivatives thereof can be mentioned.

  Conventionally known means such as a commonly used dipping method, roll coating method, screen printing method, spraying method, gravure printing method and the like can be used for the coating method. The thickness of the coating varies depending on the type of coating agent, processing machine, and processing conditions. When the thickness after drying is 0.01 μm or less, a uniform coating film may not be obtained and sufficient gas barrier properties may not be obtained. Further, when the thickness exceeds 50 μm, there is a problem because cracks are likely to be generated in the film. It is preferably in the range of 0.01 to 50 μm, more preferably in the range of 0.1 to 10 μm.

  In addition, as shown in FIG. 2, it is also possible to similarly provide the vapor deposition thin film layer 6 and the coating layer 7 on the vapor deposition thin film layer 3 and the coating layer 4, and can provide it in multiple layers as needed. .

  Next, the pressure-sensitive adhesive layer 5 in contact with the surface to be bonded of the sealing tape 1 of the present invention is formed on the coating layer, and the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited. , Vinyl acetate, rubber, silicon, etc. may be used. In particular, an acrylic pressure-sensitive adhesive having excellent heat resistance and weather resistance is preferably used.

  For example, acrylic pressure-sensitive adhesives are mainly composed of a copolymer of alkyl acrylate and acrylic acid, with cross-linking agents, tackifiers, plasticizers, fillers, heat stabilizers, UV absorbers and the like as subcomponents. The selected adhesive is selected. The crosslinking agent is used to improve the heat resistance / creep resistance of the adhesive layer, for example, a reactive crosslinking agent such as isocyanate, epoxy, aziridine, organometallic, chelate, or amine, or A copolymer type cross-linking agent using a polyfunctional vinyl monomer such as diacrylate or divinyl is used. Other subcomponents such as a tackifier and a plasticizer can be appropriately added depending on the purpose.

  Although the thickness of the adhesion layer 5 will not be restrict | limited if it is a grade which does not impair performance, The range of 5-100 micrometers is normally used, Preferably it is 10-30 micrometers.

  A known coating method may be used for coating the coating layer 4 with the pressure-sensitive adhesive, and conventionally known means such as a dipping method, a roll coating method, a screen printing method, a spray method, and a gravure printing method can be used.

Moreover, as shown in FIG. 3A, the pressure-sensitive adhesive tape 12 for sealing of the present invention has a release layer 8 formed on a substrate 2, and the adhesive layer 5 is formed of a release layer as shown in FIG. It is good also as the roll 10 wound up in the shape of a roll which touches 8, and in this structure, a release paper and a peeling tape become unnecessary. The release agent that constitutes the release layer 8 may be such that the adhesive layer 5 can be easily released from the release layer 8 when the adhesive tape 12 for sealing is pulled out from the roll 10. For example, a silicone resin such as UV silicone, fluorine resin, wax It can be formed by coating. A known coating method may be used, and conventionally known means such as a dipping method, a roll coating method, a screen printing method, a spray method, and a gravure printing method can be used. The coating amount of the release agent is usually 0.01 to 10 g / ^{m 2,} preferably selected in the range of 0.1 to 1 g / ^{m 2.}

The evaluation about the adhesive performance which describes the obtained adhesive tape below is as follows.
<Evaluation test of adhesive tape>
Adhesive strength: The adhesive tape was compliant with JIS-Z-0237, the adherend was SUS304, the peeling angle was 180 degrees, and the peeling speed was 300 mm / min.
Holding power: Adhesive tape conformed to JIS-Z-0237, adherend was SUS304, affixed area was 10 × 20 mm, test temperature was 120 ° C., load was 300 g, and test time was 60 minutes.
Terminal peeling: The adhesive tape was wound around a glass rod having a diameter of 8 mm for about 2 turns, and after 1 day at 23 ° C., peeling of the tape terminal was measured.

  Moreover, the oxygen absorbent formed by adhering to, sticking to, or mixing with the adhesive layer 5 is prepared by mixing iron with a resin such as polyolefin and absorbing oxygen by oxidation of this iron, or oxidizing such as cobalt with polypropylene or the like. Some of them add a catalyst and absorb oxygen by oxidation of the resin. In addition, there are those made of activated carbon containing sodium hyposulfite, calcium hydroxide and water, and those made of ferrous chloride and sodium sulfite. Furthermore, reducing sugars such as glucose, iron powder, ascorbic acid, etc. It is also effective to form a pressure-sensitive adhesive layer 5 by mixing with a pressure-sensitive adhesive, or to adhere to the pressure-sensitive adhesive surface on the pressure-sensitive adhesive layer 5.

  Although not shown, a resin film (sheet) having gas barrier properties may be laminated between the coating layer 4 and the adhesive layer 5. Examples include polyvinylidene chloride (PVDC) resin, polyvinyl alcohol (PVA) resin, ethylene-vinyl alcohol copolymer (EVOH), and MX nylon (MXD6).

The sealing adhesive tape of the present invention will be described with specific examples.
<Example 1>
As a base material 2, metal aluminum is evaporated on one side of a biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm by a vacuum vapor deposition apparatus using an electron beam heating method, oxygen gas is introduced therein, and a thickness of 15 nm is introduced. Aluminum oxide was deposited to form a deposited thin film layer 3 made of an inorganic oxide. Next, a coating agent having the following composition was applied by a gravure coating method and then dried at 120 ° C. for 1 minute to form a coating layer 4 having a thickness of 0.5 μm. The composition of the coating agent is a mixture of “1 liquid” and “2 liquid” in a mixing ratio (wt%) of 60/40.

“1 liquid”: Hydrochloric acid solution “2 liquid” having a solid content of 3 wt% (in terms of SiO 2) obtained by adding 89.6 g of hydrochloric acid (0.1N) to 10.4 g of tetraethoxysilane and stirring for 30 minutes for hydrolysis 3 wt% alcohol / isopropyl alcohol solution (90:10 by weight of water: isopropyl alcohol)

  An acrylic pressure-sensitive adhesive is applied on the coating layer 4 and dried to form a pressure-sensitive adhesive layer 5 having a thickness of 20 μm, and an adhesive film is formed. Obtained.

The composition of the acrylic adhesive is
“Liquid A”: Ethyl acetate solution of butyl acrylate-methacrylic acid-acrylonitrile copolymer having a solid content of 20% by weight, copolymerized at a ratio of 85 mol% butyl acrylate, 3 mol% methacrylic acid, and 12 mol% acrylonitrile. Adjusted.
“Liquid B”: 70% by mole of vinyl acetate and 30% by mole of 1-vinyl-2-pyrrolidone, copolymerized in an ethanol solution of vinyl acetate-1-vinyl-2-pyrrolidone copolymer having a solid content of 50% by weight Adjusted.

The above "A liquid" and "B liquid" were uniformly mixed at a solid content of 100: 3 (weight ratio) to obtain an acrylic pressure-sensitive adhesive, whereby an acrylic pressure-sensitive adhesive was obtained.

<Example 2>
The sealing pressure-sensitive adhesive tape of the present invention is the same as in Example 1 except that the deposited thin film layer 3 made of an inorganic oxide is formed with silicon oxide having a thickness of about 20 nm by a vacuum deposition method using a resistance heating method. Got.

<Example 3>
In Example 1, on the coating layer 4 formed on the vapor deposition thin film layer 3, metal aluminum was further evaporated by a vacuum vapor deposition apparatus using an electron beam heating method, oxygen gas was introduced therein, and aluminum oxide having a thickness of 15 nm was obtained. Example 1 except that a vapor-deposited thin film layer 6 made of an inorganic oxide was formed by vapor deposition, and a coating layer 7 having a thickness of 0.5 μm was provided by gravure coating with a coating agent composed of the same component as the coating layer 4. Similarly, the pressure-sensitive adhesive tape for sealing of the present invention was obtained.

<Example 4>
The sealing adhesive tape obtained in Example 1 was coated with 0.1 g / m ² of a silicone release agent on the surface opposite to the vapor-deposited thin film layer 3 of the base material 2 to form a sealing adhesive tape. It wound up on the core 9 and obtained the roll 9 of the pressure-sensitive adhesive tape 11 of the present invention.

<Example 5>
In the pressure-sensitive adhesive layer of the sealing pressure-sensitive adhesive tape 1 obtained in Example 1, a solution composed of 30 parts by weight of ferrous sulfate and heptahydrate per 100 parts by weight of sodium L-ascorbate was prepared as an oxygen absorbent. This was pulverized by a spray drying method. Kneading 0.1 part by weight of an oxygen absorbent with respect to 100 parts by weight of the acrylic pressure-sensitive adhesive described in Example 1, and applying and drying to form a pressure-sensitive adhesive layer 5 having a thickness of 20 μm to obtain a sealing pressure-sensitive adhesive tape I was able to.
<Comparative Example 1>
In Example 1, an adhesive tape for sealing was obtained in the same manner as in Example 1 except that the coating layer 4 was not provided.

<Comparative example 2>
In Example 1, an adhesive tape for sealing was obtained in the same manner as in Example 1 except that the coating agent for the coating layer 4 was vinylidene chloride.

<Comparative Example 3>
In Example 1, an adhesive tape for sealing was obtained in the same manner as in Example 1 except that a metal aluminum foil was stuck instead of the deposited thin film layer 3.

<Evaluation>
The sealing tapes of Examples and Comparative Examples were measured for oxygen permeability (ml / m ² · day · MPa) and water vapor permeability (gr / m ² · day) as indicators of gas barrier properties. The measurement is performed using the Mocon method, and the measurement conditions at that time are an oxygen transmission rate of 30 ° C.-70% RH and a water vapor transmission rate of 40 ° C.-90% RH.
Moreover, the adhesion suitability, tackiness, transparency, and discardability of the ink or the pressure-sensitive adhesive were comparatively evaluated. The results are shown in Table 1.

  In the table, “0.1>” means that the value of the measurement result was 0.1 or less.

  From the evaluation results, the sealing pressure-sensitive adhesive tape of the present invention is superior in gas barrier properties as compared with the comparative examples, and is also excellent in transparency, discardability, adhesiveness, and adhesion.

  In particular, the adhesive strength and holding power have no problems as the characteristics of the adhesive tape, the end of the sealing adhesive tape does not peel off, the tracking property is good, the tape is not distorted, and the side of the sealing adhesive tape oozes out. There was no stickiness.

As described above, the pressure-sensitive adhesive tape for sealing of the present invention has high gas barrier properties and adhesiveness equivalent to those of metal foils, and has a gas barrier property in bonding between gas barrier films and sealing a bag mouth of a packaging bag made of a gas barrier film. The packaged body can be packaged in a state of holding the gas, and the gas barrier property can also be maintained in sealing the container and the lid.
Also,

It is a fragmentary sectional view of the example of the adhesive tape for sealing which has the high gas barrier property of this invention. It is a fragmentary sectional view of the other example of the adhesive tape for sealing which has the high gas barrier property of this invention. (A) It is a fragmentary sectional view of the other example of the sealing adhesive tape which has the high gas barrier property of this invention, and (b) The perspective view of the example which made the sealing adhesive tape of (a) the roll shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 12 ... Sealing adhesive tape 2 ... Plastic base material 3, 6 ... Deposition thin film layer 4, 7 ... Coating layer 5 ... Adhesive layer 8 ... Release layer 9 ... Core 10 ... Roll

Claims (8)

On at least one surface of the plastic substrate, a vapor-deposited thin film layer that is a metal or an inorganic oxide or a mixture thereof, a water-soluble polymer and (a) one or more alkoxides and / or hydrolysates thereof or (b) tin chloride A pressure-sensitive adhesive tape for sealing, comprising an aqueous solution containing at least one of them, or a film layer made of a coating agent mainly composed of a water / alcohol mixed solution and an adhesive layer .   The pressure-sensitive adhesive tape for sealing according to claim 1, wherein two or more layers of the vapor-deposited thin film layer and the multilayered layer are laminated.   The said vapor-deposited thin film layer is inorganic oxides, such as metals, such as aluminum, copper, and silver, yttrium tantalum oxide, aluminum oxide, silicon oxide, magnesium oxide, or mixtures thereof, The Claim 1 or 2 characterized by the above-mentioned. Adhesive tape for sealing.   The pressure-sensitive adhesive tape for sealing according to claim 1 or 2, wherein the metal alkoxide is tetraethoxysilane, triisopropoxyaluminum, or a mixture thereof.   The pressure-sensitive adhesive tape for sealing according to claim 1 or 2, wherein the water-soluble polymer is polyvinyl alcohol.   The pressure-sensitive adhesive tape for sealing according to claim 1 or 2, wherein a plastic film layer having a gas barrier property is laminated between the coating layer and the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive tape for sealing according to any one of claims 1 to 6, wherein a release layer is formed on the outermost surface side, and the pressure-sensitive adhesive layer is in a roll shape wound so as to be in contact with the release layer.   The pressure-sensitive adhesive tape for sealing according to any one of claims 1 to 7, wherein an oxygen absorbent is attached to or mixed with the pressure-sensitive adhesive layer.

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