JP3931389B2 - Gas barrier laminated film - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas barrier laminate film using a vapor deposition film provided with a metal oxide vapor deposition layer such as silicon oxide or aluminum oxide, and in particular, a gas barrier property using an adhesive for wet lamination with no problem of residual solvent. The present invention relates to a laminated film.
[0002]
[Prior art]
Vapor-deposited films deposited with metal oxides such as silicon oxide and aluminum oxide are widely used as packaging materials that are transparent and have excellent gas barrier properties. (For example, see Japanese Examined Patent Publication No. 53-12953)
When the vapor-deposited film is actually used as a bag or the like, the vapor-deposited film is used as a laminated film having a heat-sealing film such as polyethylene or a sealant layer made of a resin layer inside the vapor-deposited film. (For example, refer to Japanese Utility Model Publication No. 52-24608)
At this time, when a sealant layer is provided on the vapor deposition layer of the vapor deposition film via an adhesive, a one-component or two-component curable dry laminating adhesive having an active source such as a hydroxyl group or an isocyanate group is not used. Sufficient adhesive strength was not obtained.
On the other hand, since a dry laminate adhesive is used, there is a problem of residual solvent in addition to working environment problems.
In addition, there is a problem that the adhesive strength is not sufficient when a wet lamination adhesive that does not have a problem of residual solvent, has a small amount of adhesive applied, and has a high bonding speed is used.
[0003]
[Problems to be solved by the invention]
The present invention provides a material for providing a gas barrier laminated film obtained by laminating a metal oxide vapor-deposited film excellent in gas barrier properties and a porous material using an adhesive for wet lamination without a problem of residual solvent. With the goal.
[0004]
[Means for Solving the Problems]
The invention, of deposited film forming a metal oxide deposited layer, the water-soluble polymer deposition layer and a metal alkoxide or aqueous coating agent layer having a composition comprising a hydrolyzate thereof provided on the substrate, the aqueous coating It is a gas barrier laminate film in which a porous material is laminated on an agent layer via an acrylic ester resin emulsion adhesive layer for wet lamination. Further, the water-resistant coating layer surface, a gas barrier laminate film having a printing layer comprising a curable ink having a urethane group. Its to the thickness of the deposited layer is a gas barrier laminate film which is less 800 Å.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the laminated film of the present invention comprises a vapor-deposited film 3 in which a metal oxide vapor-deposited layer 2 is formed on one side of a substrate 1, and a water-soluble polymer and a metal alkoxide or An aqueous coating agent layer 4 having a composition containing the hydrolyzate is provided, and a porous material layer 6 is laminated on the aqueous coating agent layer via an acrylic ester resin emulsion adhesive layer 5 for wet lamination. . Moreover, as shown in FIG. 2, it is a gas barrier laminated film which provided the printing layer 7 which consists of curable ink which has a urethane group on the surface of the aqueous | water-based coating agent layer 4 of the laminated film shown in FIG.
[0006]
Here, the base material 1 is preferably a polymer film, and polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, nylon, polycarbonate, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, and the like can be used.
[0007]
And the vapor deposition layer 2 consists of metal oxides, such as a silicon oxide, aluminum oxide, and magnesium oxide, and consists of the said compound single-piece | unit or the composition which mixed these. The thickness of the deposited layer is preferably in the range of 100 to 2000 mm, particularly in the range of 100 to 800 mm.
The aqueous coating agent layer 4 provided on the vapor deposition layer 2 may be a substance that forms a certain thin film on the surface, and a composition containing a water-soluble polymer or a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof is particularly preferable. .
[0008]
Each component contained in the coating agent layer will be described in detail below.
Examples of the water-soluble polymer used in the coating agent in the present invention include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. In particular, when polyvinyl alcohol (PVA) is used for the coating agent of the gas barrier laminate of the present invention, the gas barrier property is most excellent. PVA here is generally obtained by saponifying polyvinyl acetate, from so-called partially saponified PVA in which several tens percent of acetic acid groups remain to completely saponified PVA in which only several percent of acetic acid groups remain. There is no particular limitation.
[0009]
The metal alkoxide used together with the water-soluble polymer is a general formula such as tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ] or triisopropoxyaluminum [Al (O-2′-C ₃ H ₇ ) ₃ ]. ,
M (OR) _n
(M: metal such as Si, Ti, Ai and Zr, R: alkyl group such as CH ₃ and C ₂ H ₅ ). Among these, tetraethoxysilane and triisopropoxyaluminum are preferable because they are relatively stable in an aqueous solvent after hydrolysis.
[0010]
Each of the above components can be added to the coating agent alone or in combination, and further within the range that does not impair the barrier properties of the coating agent, isocyanate compound, silane coupling agent, dispersant, stabilizer, viscosity adjustment Known additives such as coloring agents and coloring agents can be added.
[0011]
For example, the isocyanate compound added to the coating agent has two or more isocyanate groups (NCO groups) in the molecule, such as tolylene diisocyanate (TDI), triphenylmethane triisocyanate (TTI), tetramethylxylene. There are monomers such as diisocyanate (TMXDI), and polymers and derivatives thereof.
[0012]
Conventionally known means such as a dipping method, a roll coating method, a screen printing method, and a spray method are used for the coating method of the coating agent. Although the thickness of the film varies depending on the type of coating agent, the thickness after drying may be in the range of about 0.01 to 100 μm. However, if the thickness is 50 μm or more, cracks are likely to occur in the film. 50 μm is desirable.
[0013]
On the other hand, wet lamination adhesive layer 5 is the A acrylic acid ester resin Emarujo down contact adhesive, ^{thickness, 1g / m 2 ~5g / m} 2 are suitable range of (dry), the paper used Adjust the coating amount and viscosity according to the type. As shown in FIG. 2, the printing layer 7 may be provided on the entire surface or partially. In particular, a curable ink having a urethane group is formed between the aqueous coating agent layer and the wet lamination adhesive layer. Excellent adhesive strength.
[0014]
The porous material 6 is a porous material such as thin paper, fine paper, pure white roll paper, parchment paper, or non-woven fabric, and is used according to the purpose if the diluent of the adhesive is evaporated during drying. be able to.
Since the laminated film of the present invention is provided with an aqueous coating agent layer on the vapor deposition layer surface, sufficient adhesive strength between layers can be obtained even with a laminated film using an adhesive layer for wet lamination.
[0015]
Further, as the aqueous coating agent layer, by using a composition containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof, not only adhesive strength but also gas barrier properties can be improved, such as candy and biscuits. It can be used for wrapping paper or cup containers such as ice cream.
[0016]
Specific examples of the present invention are shown below.
(1) Candy wrapping paper: polyethylene terephthalate film / aluminum oxide vapor deposition layer / aqueous coating agent layer (/ printing layer) / wet lamination / thin paper (2) Biscuit wrapping paper: polyethylene terephthalate film / aluminum oxide vapor deposition layer / Aqueous coating agent layer (/ printing layer) / wet lamination / quality paper (3) Chewing gum wrapping paper: (printing layer /) fine paper / wet lamination / aqueous coating agent layer / aluminum oxide vapor deposition layer: polyethylene terephthalate film / Adhesive layer / Polyethylene layer (4) Ice cream cup: Polyethylene terephthalate film / Aluminum oxide layer / Aqueous coating agent layer / Print layer / Wet lamination / Cup base paper (5) Butter, Margarine Wrapping paper: polyethylene terephthalate film / aluminum oxide vapor deposition layer / aqueous coating agent layer / print layer / wet lamination / parchment paper
Here, as an aqueous coating agent, 89.6 g of hydrochloric acid (0.1N) was added to 10.4 g of tetraethoxysilane, and stirred for 30 minutes to hydrolyze a hydrolyzed solution having a solid content of 3 wt% (in terms of SiO ₂ ) ( A composition in which A) and a 3.0 wt% water / isopropyl alcohol (90/10) solution (B) of polyvinyl alcohol were mixed was used.
[0018]
The adhesive used for wet lamination was an acrylate resin emulsion adhesive.
You may provide a printing layer as needed.
[0019]
【The invention's effect】
The present invention, since the above configuration, the use of acrylic acid ester resin emulsion adhesive as U E Tsu preparative lamination adhesive, adhesive strength sufficient interlayer is obtained. Further, since there is no residual solvent in the adhesive layer, packaging without a solvent odor is possible even when foods are packaged using a laminated film.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a laminated film of the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of the laminated film of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Deposition layer 3 ... Deposition film 4 ... Aqueous coating layer 5 ... Adhesive layer 6 for wet lamination ... Porous material 7 ... Printing layer

Claims (3)

An aqueous coating agent layer having a composition containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof is provided on the vapor deposition film in which a metal oxide vapor deposition layer is formed on a substrate, and the aqueous coating agent layer is wet. A gas barrier laminate film in which a porous material is laminated via an acrylic ester resin emulsion adhesive layer for lamination. The gas barrier laminate film according to claim 1, wherein a printing layer made of a curable ink having a urethane group is provided on the surface of the aqueous coating agent layer. Gas barrier laminate film according to any one of the thickness of the deposited layer is not more than 800Å claims 1 to 2.

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