JPS5938265Y2 - packaging material - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a packaging material, particularly a packaging material with excellent moisture-proofing and gas-barrier properties.

Conventionally, vinylidene chloride coating has been used to improve the moisture and gas barrier properties of plastic packaging materials, but there are problems with vinylidene chloride's hygiene, environmental protection, etc. Almost 10-20'? There are drawbacks such as the fact that satisfactory improvements in moisture resistance and gas barrier properties cannot be obtained unless the coating is coated with /rrt'.

Therefore, the plastic packaging material coated with vinylidene chloride can be used instead.

Thermoplastic resins can be used as packaging materials that have good impermeability to moisture and gas, can be produced more cheaply and economically than the vinylidene chloride-coated plastic packaging materials mentioned above, and do not pose any problems in terms of hygiene or environmental conservation. A metal/acid coated polymer molded article, which is formed by providing a coating made of a metal orithorite having a specific metal nitrate atomic ratio on the substrate, and further forming a sealable polymer overcoat layer thereon. was proposed.

(Refer to Japanese Unexamined Patent Publication No. 48-40869) However,
This metal phosphate coating layer has poor moisture resistance and its physical properties deteriorate under high humidity conditions (e.g. 90% relative humidity), causing the metal phosphate coating layer to deteriorate when the base material and the sealable polymer topcoat layer are exposed. It has the disadvantage of peeling off across layers.

It is thought that this decrease in physical properties causes the sealable polymer top coat to peel off from the substrate because the metal phosphate coating comes into contact with moisture and undergoes hydrolysis.

The inventor of the present invention conducted various studies and studies on preventing the hydrolysis of the metal phosphate coating layer in order to eliminate the drawbacks of such packaging materials, and as a result, he succeeded in obtaining a packaging material that does not have these drawbacks.

The present invention provides a water-repellent ink coating layer around the inner surface of a plastic film, and metal rinsing is applied to a portion of the inner surface of the plastic film that is not provided with the water-repellent ink coating layer and is surrounded by the water-repellent ink coating layer. This packaging material is formed by forming an acid salt coating layer, and further forming a heat-sealable resin layer on the water-repellent ink layer and the metal phosphate coating layer.

In the packaging material according to the present invention, since the metal phosphate coating layer is surrounded by the water-repellent ink coating layer and does not come into contact with the outside air, hydrolysis of the metal phosphate coating layer due to moisture does not occur. is hindered.

Therefore, in the packaging material of the present invention, the base material and the heat-sealable resin layer do not deteriorate the physical properties of the metal phosphate layer even in high humidity conditions. It has the advantage of not peeling off at the interface and has excellent moisture and gas barrier properties.

Next, the packaging material of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a perspective view of a part of the packaging material of the present invention shown inside, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

In Figures 1 and 2, 1 is a plastic film, 2 is a water-repellent ink coating layer provided around the plastic film, and 3 is a metal phosphoric acid or salt coating layer. It is provided only in the part surrounded by the water-repellent ink film layer 2 on the inner surface of the plastic film 1 and where the water-repellent ink film layer 2 is not provided,
Reference numeral 4 denotes a heat-sealable resin layer, and this resin layer 4 is formed on the water-repellent ink coating layer 2 and the phosphate coating layer 3.

Examples of materials that can be used as the plastic film 1 in the packaging material of the present invention include polyesters, polyolefins such as polypropylene and polyethylene, tetrafluoroethylene resins, hexafluoropropylene resins, acrylonitrile resins, polyvinyl chloride, polyvinylidene chloride, and polyfluoride resins. vinyl, polystyrene, polyimide, boria, mido,
Examples include films of acetate, cellulose acetate, and cellophonate.

Among others, polyester, oriented polypropylene.

It is preferable to use stretched boria, cellophane, or the like.

Examples of water-repellent inks that can be used to form the water-repellent ink film layer of the packaging material of the present invention include nitrocellulose-based ink, vinyl resin-based ink, Boria 5-nitrocellulose-based ink, and Se/I/O- S+ Ho! 7-
r-Stell ink, vinyl acetate vinyl chloride copolymer +
Examples include maleic acid isocyanate two-component type ink, polyamide-nitrocellulose+wax type ink, and the like.

The metal phosphate coating layer is formed using a phosphate ion-containing aqueous solution prepared by dissolving phosphoric acid and a phosphate, such as sodium orthophosphate monobasic aluminum phosphate, aluminum chlorohydroxide, and aluminum chloride. , basic acid-resistant aluminum pentium, ferric chloride, tin tetrachloride, titanium tetrachloride,
This can be carried out using a solution obtained by mixing basic zirconium chloride with a metal ion-containing aqueous solution obtained by dissolving chlorides of magnesium, chromium, and zinc.

Next, in the packaging material of the present invention, the resin used to form the heat-sealable resin layer formed on the water-repellent ink film layer and the metal phosphate film layer is polyethylene, vinylidene chloride polymer, and copolymer. Examples include polymers, polypropylene, and the like.

Note that it is also possible to apply a primer coat in advance using an aqueous solution of silane, polyurethane, or melamine formaldehyde resin before forming the heat-sealable resin layer.

Furthermore, if necessary, any pattern can be printed on the outer surface of the plastic film using the above water-repellent ink or printing ink for plastic film.

You can print fonts, etc.

Next, specific examples of the present invention will be shown.

Example Thickness of polyester coated with polyvinylidene chloride 1
The inner surface of the 4μ was coated with a water-repellent ink containing the following composition: Polyester 13 parts by weight Nitrocellulose 2 parts by weight Titanium white 10 parts by weight Wax 2 parts by weight Drol 20 parts by weight Ethyl acetate 20 parts by weight Methyl ethyl ketone 20 parts by weight A water-repellent ink film layer with a width of 10 mm is formed on a portion of the film corresponding to the sealing portion; then, the following composition: Monobasic aluminum phosphate 5 (
A phosphate ion-containing aqueous solution was prepared by dissolving H' in 500 frll of an aqueous solution, and a portion of the aqueous solution containing 50% aluminum chlorohydroxide was added.
1 was dissolved in 500 ml of aqueous solution to prepare a metal ion-containing aqueous solution, and a phosphate ion-containing aqueous solution and an aluminum ion-containing aqueous solution were added to form a metal phosphate film forming solution. (when dry), and then a heat-sealable resin layer of polyethylene was formed to produce a product.

This product is useful as a packaging material with excellent water resistance, moisture resistance, and gas barrier properties.

Next, a comparative example will be shown.

Comparative Example 1 In the above examples, the water-repellent ink film layer was omitted, and a metal phosphate film was provided to produce a product.

Comparative Example 2 A product was prepared in the above example without providing the water-repellent ink coating layer and the metal phosphate coating layer.

Regarding each of the products in the actual furnace example, Comparative Example 1, and Example 2 mentioned above, water resistance (immersed in water at room temperature for 24 hours) and moisture permeability (?/yr?24hr atmXDR, water vapor permeability measuring device manufactured by LYSSY) were tested. L80 model (Swiss diagram)] and gas permeability (cc1 m' 24 hr.

atm) [DR, LYSSY gas permeability measuring device L
100 model (Swiss diagram)] are shown in Table 7 below. Table Water resistance Moisture permeability Gas permeability Example No peeling 1,24 Comparative example 1 No peeling 1.24 Comparative example 2 No peeling 8 12 Above From the results shown in the table, it can be seen that when a water-repellent ink layer is provided around the periphery as in the example and a metal phosphate coating layer is provided inside the surrounding water-repellent ink layer, releasability, moisture permeability, and gas barrier properties are improved. It is recognized that we are superior in all aspects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the inside of the packaging material of the present invention after being cut away, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... Plastic film, 2...
Water-repellent ink coating layer, 3...metal phosphate coating layer, 4... heat-sealable resin layer.

Claims (1)

[Scope of utility model registration request] A water-repellent ink coating layer 2 is provided on the peripheral portion of the inner surface of the plastic film 1, and a portion of the inner surface of the plastic film 1 surrounded by the water-repellent ink coating layer 2 where the water-repellent ink coating layer 2 is not provided is provided with a water-repellent ink coating layer 2. A packaging material formed by forming a metal phosphate coating layer 3, and further forming a heat-sealable resin layer 4 on the water-repellent ink coating layer 2 and the metal phosphate coating layer 3.