JPS6053698B2 - Laminated material for extruded tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a laminate material for extruded tubes for toothpaste, cosmetics, etc., which does not allow volatile components to pass through.

As a material for extruded tubes, Japanese Patent Publication No. 39-1084
The one shown in Publication No. 7 is known.

What is described in this publication is a method in which an alkali-resistant and acid-resistant synthetic resin film is laminated on the inner surface of an aluminum foil via an adhesive, and a flexible and strong synthetic resin layer is formed on the outer surface of the aluminum foil. This is a flexible laminated body that is laminated to form a cylindrical tube body. However, in the laminated material described in this publication, volatile components such as aromatic oils and fragrances in the content are contained in an alkali-resistant and acid-resistant synthetic resin film laminated on the inner surface of the aluminum foil. gradually passes through and reaches the adhesive bonding the aluminum foil and the alkali-resistant and acid-resistant synthetic resin film, resulting in delamination between the aluminum foil and the alkali-resistant and acid-resistant synthetic resin film. .

Therefore, it has been proposed to use an acid polymer that can directly react with the metal foil as an adhesive between the metal foil and the alkali-resistant and acid-resistant synthetic resin film, but even in this case, it is not always sufficient. There is a drawback that the above-mentioned delamination may occur depending on the contents. Furthermore, as mentioned above, the volatile components that permeate through the alkali-resistant and acid-resistant synthetic resin film gradually penetrate the pinholes of the aluminum foil on its outer surface, as well as the flexible laminate on its outer surface. As a result, there is a risk that the contents may lose their aroma or solidify during storage.

By having the structure described in the claims, the present invention can easily prevent the permeation of volatile components, thereby preventing delamination between the aluminum foil and the synthetic resin film, and making it possible to preserve the contents for a long period of time. We were able to obtain a laminated material.

The drawing shows one embodiment of the present invention, and the present invention will be explained based on this drawing.A gas shielding layer 2 is laminated on one surface of a metal foil 1 via an adhesive 3. Further, a polyolefin resin layer 5 is laminated on the surface of the gas shielding layer 2 with an adhesive resin 4 interposed therebetween.

The aforementioned metal foil 1 is an aluminum foil having a thickness of about 7 to 15 microns.

Further, the gas shielding layer 2 has an ethylene content of 20 to 5.
0 mol%, saponified ethylene-vinyl acetate with a degree of saponification (degree of saponification relative to vinyl acetate in the copolymer) of 95 mol% or more,
Or 6-1, 6●6-, 10-, 11-1 or 12
- Thickness 1 made of one or more types of nylon, copolymer resin of these nylons, or acrylonitrile resin
The thickness is 0 to 50μ, preferably 15 to 30μ. The adhesive resin 4 is made of a carboxylic acid graft-modified polyolefin, an olefin-unsaturated carboxylic acid copolymer, or a metal ion crosslinked product thereof, and has a thickness of 10 to 50 μm, preferably 15 to 30 μm.

Furthermore, the polyolefin resin layer 5 includes polyethylene, polypropylene, ethylene-α-olefin copolymer,
These include ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ionomer.

The melt index (M.I.
) The polyolefin resin is formed to have a thickness of 10 to 100 μm, preferably 30 to 60 μm.

Furthermore, one or more layers of the same or different types of polyolefin resins may be laminated on the layer as necessary. The gas shielding layer 2, the adhesive resin layer 4, and the polyolefin resin layer 5, or the gas shielding layer 2 and the adhesive resin layer 4, are formed in advance as a coextruded film 6, and this is coated with a metal foil via the adhesive 3. 1 and can be easily laminated. The metal foil 1 and the coextruded film 6 in the above
The adhesive 3 used is polyolefin such as polyethylene or polypropylene, epoxy resin, polyurethane resin, or the like.

In the laminated material according to the present invention, paper 8 is further laminated via an adhesive 7 on the opposite side of the coextruded film 6 and the laminated surface of the metal foil 1, and the paper 8 is sequentially laminated on the surface of the paper 8. A base layer 9, a printed portion 10, and a protective layer 11 are laminated.

The adhesive 7 mentioned above is mainly made of polyolefin, polyvinyl chloride, acrylic resin, epoxy resin, rubber derivative, polyurethane, and other synthetic resins.
Any material can be used as long as it can be bonded to the surface of the film, and can be formed by extrusion coating, film-z lamination, liquid coating, or other conventional coating methods. Further, the paper 8 may be glassine paper, kraft paper, imitation paper, or synthetic paper, and has a basis weight of about 20 to 70 g/Wt.

The base layer 9 is formed on the surface of the paper 8 by a conventional coating method using a composition obtained by adding a filler, a coloring agent, etc. to a resin, and sufficiently kneading the resin with a solvent, a diluent, etc.

Alternatively, it can also be formed by forming a colored resin composition into a film and laminating it using a normal lamination method or by extrusion coating. The printing pattern of the printing section 10 is, for example, characters, figures, etc.), and is printed using a normal ink composition such as offset, gravure, screen, etc.
Print by flexo printing method etc.

Moreover, the protective layer 11 is made of polyethylene, polypropylene,
Resins such as polyvinyl chloride, polyvinylidene chloride, polystyrene, polyacid, and polyester can be used, and the layer may have one or more layers depending on the purpose.

The protective layer 11 can be formed by various methods such as an extrusion coating method, a film lamination method, and a liquid coating method. The present invention has the above configuration, and the laminate material according to the present invention forms an extruded tube with the surface on which the coextruded film 6 is laminated as the inner surface of the tube. That is,
In the laminated material according to the present invention, a gas shielding layer 2, an adhesive resin layer 4, and a polyolefin 7-based resin layer 5 are sequentially laminated on the inner surface of a metal foil 1, and volatile components in the contents are contained in the polyolefin-based resin layer. 5 and the adhesive resin layer 4, and the gas shielding layer 2 formed on the outer surface completely blocks the transmission, so that the metal foil 1 and the gas shielding layer 2 Volatile components do not permeate the adhesive 3 interposed between the metal foil 1 and the coextruded film 6, and therefore there is no risk of delamination between the metal foil 1 and the coextruded film 6.

That is, in the present invention, the presence of the gas shielding layer 2 not only prevents the volatile components of the contents from permeating, but also prevents the gas shielding layer 2, the adhesive resin layer 4 and the polyolefin resin layer 5 from permeating. By synergizing the effects of each,
Permeation of volatile components of the contents can be reliably prevented, and therefore no delamination occurs at all, and the contents hardly change even during long-term use or storage.

Further, in the laminated material according to the present invention, paper such as glassine paper, kraft paper, imitation paper, or synthetic paper is laminated on the outer surface side of the metal foil 1, so that a tube is formed by the laminated material according to the present invention. When the contents are extruded, the laminated material can be given appropriate flexibility, and the laminated material can be given an appropriate tear-resistant strength, so that it will not crack at the middle part of the tube, etc. Another advantage is that there is no risk of the contents leaking.

As described above, when the laminated material according to the present invention is used as an extruded tube, volatile components of the contents do not permeate, and therefore, there is no delamination between the metal foil and the coextruded film on its inner surface. There is no risk of deterioration of the contents even after long-term use or storage, and it can be widely applied to containers for toothpaste, cosmetics, fragrances, and other containers. Furthermore, since the laminated material according to the present invention can provide appropriate flexibility and bag breakage resistance, there is also the advantage that there is no risk of the contents leaking from the middle part of the tube.

Example: Basis weight 42y/d (7)A imitation paper and 40μ milky white polyethylene are laminated using 20μ polyethylene.

A pattern is printed on the opposite side of the milky white polyethylene using a gravure printing method, and polyethylene is further applied on this printed side for 50 minutes.
It is extruded and coated to a thickness of 0μ to form a protective film. Next, aluminum foil with a thickness of 15 μm is laminated on the opposite side of the above-mentioned imitation paper A using polyethylene with a thickness of 20 μm.

On the other hand, a saponified ethylene-vinyl acetate copolymer layer with an ethylene content of 35 mol% was used as a gas shielding layer, with a thickness of 20 μm, and a maleic anhydride-modified polyethylene layer with a thickness of 2 μm was used as an adhesive resin.
0μ and M.0μ as the polyolefin resin layer. I. A coextruded film with an ionomer resin layer of No. 2 having a thickness of 50 μm was prepared.

In addition, the gas shielding layer is 6-nylon with a thickness of 20P, and the adhesive resin layer is with maleic anhydride-modified polyethylene with a thickness of 2.
0μ and M.0μ as the polyolefin resin layer. I. A co-extruded film of the ionomer Jugetsu BOμ of No. 2 was created, and each of the above two co-extruded films was laminated with a urethane adhesive to an aluminum foil to which the imitation paper A was laminated separately to form a laminate. When a tube for extrusion was formed from the aluminum foil, toothpaste was added to the tube, and the tube was stored for a long period of time, no volatile components were observed to permeate through either of the two laminated materials. No peeling was observed, and no change was observed in the contents.

[Brief explanation of the drawing]

The drawings are schematic cross-sectional views showing one embodiment of the present invention. 1... Metal foil, 2... Gas shielding layer, 3
...Adhesive, 4...Adhesive resin layer, 5
...Polyolefin resin layer, 6...
Coextrusion film, 7...Adhesive/agent, 8...
... Paper, 9 ... Base layer, 10 ... Printing section, 11 ... Protective layer.

Claims (1)

[Claims] 1 A coextruded film of a gas shielding layer and a polyolefin resin layer is laminated on one surface of the metal foil via an adhesive, and paper is laminated and bonded to the other surface of the metal foil. A laminated material for extruded tubes, characterized in that a base layer, a printed portion, and a protective layer are sequentially provided on the paper surface.