JPH0791395B2 - Marking method for adhesive film - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of displaying an adhesive film for marking used for displaying an object surface and forming a decoration, and more specifically to a surface of a polyolefin-based adherend. The present invention relates to a method of applying a modified polyolefin to the above to improve the adhesiveness to a pressure-sensitive adhesive film for marking and its retention.

[Prior Art] Conventionally, an adhesive film comprising a vinyl chloride resin film as a base material, a printing ink layer and a clear coating film layer formed on one surface of the base material, and an adhesive layer on one surface A method of displaying a figure, a character, etc. by pressure-bonding to the surface of a polyolefin-based adherend by using it has been performed.

[Problems to be Solved by the Invention] Generally, the above-mentioned method has a drawback that the adhesive force of the pressure-sensitive adhesive film is not sufficient because the polyolefin-based adherend is non-polar and highly crystalline.

[Means for Solving the Problem] The present inventors have completed the present invention by finding that the adhesive force of an adhesive film is improved by applying a composition containing a modified polyolefin to the surface of a polyolefin-based adherend. .

That is, the present invention provides a carboxyl group-containing polyolefin and / or a sulfo group when a marking adhesive film having a vinyl chloride resin as a base material and an acrylic resin as an adhesive is applied to the surface of a polyolefin-based adherend. The present invention relates to a method for displaying a pressure-sensitive adhesive film for marking, which comprises applying a composition containing a modified polyolefin of a nyl chloride group-containing polyolefin as an essential component to the surface of the polyolefin-based adherend in advance.

In the present invention, the pressure-sensitive adhesive film for marking used, as described above, is obtained by coating a pressure-sensitive adhesive on the back surface of a film (base material) containing a vinyl chloride-based resin as a main component. The base material is a film containing a vinyl chloride resin as a main component, and further containing a colorant, a plasticizer, etc., and the film has a thickness of 20 to 50.
0μ, tensile strength 1-10kg / 25mm (tensilon type tensile tester, 300mm / min, 23 ° C, 65% RH), elongation 50-300% (same as above), concealment rate 90 or more (according to JIS K-5400) Is preferable and can be produced by a known method.

As the pressure-sensitive adhesive to be applied to the back surface of these base materials, conventionally known pressure-sensitive adhesives can be used, but acrylic resin-based pressure-sensitive adhesives excellent in weather resistance and oil resistance are particularly preferable. Or vinyl methacrylate as a main component, and if necessary, other vinyl monomers having a functional group such as a carboxyl group, a hydroxyl group, an amino group or a glycidyl group, vinyl acetate, vinylidene chloride, and acrylonitrile. An acrylic resin-based pressure-sensitive adhesive obtained by polymerization or copolymerization can be used, and a tackifier or the like can be added depending on the purpose.

In the present invention, the polyolefin-based adherend to be used is
It is a crystalline polyolefin polymer sheet or molded article obtained by polymerizing a hydrocarbon compound having an olefinic carbon-carbon bond in its molecular structure.
Typical examples of the polyolefin polymer include low-pressure polyethylene, medium-pressure polyethylene, high-pressure polyethylene,
Examples thereof include polypropylene, polybutene, ethylene-propylene copolymer, ethylene-butene copolymer and the like.

In the present invention, the composition containing the modified polyolefin as an essential component to be used is a composition in which the modified polyolefin is blended with other resin and an organic solvent as necessary.

As the modified polyolefin, a carboxyl group-containing polyolefin in which a part or all of an unsaturated carboxylic acid or an anhydride thereof is graft-polymerized to the polyolefin and sulfur dioxide and chlorine are used to form a chloro group and a sulfonyl chloride group (-SO ₂ Cl) in the polyolefin. And a sulfonyl chloride group-containing polyolefin in which is introduced.

As the polyolefin used for the modified polyolefin,
The above-mentioned polyolefin polymers can be used, but polyethylene and polypropylene are preferable.

Further, as the unsaturated carboxylic acid or its anhydride, specifically, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like, maleic acid, maleic anhydride among others preferable.

Specific examples of the modified polyolefin include P
-301, P-401, P-401MB [above, Mitsui Petrochemical Co., Ltd. "trade name" maleated polypropylene], Hypalon [Dupont de Nemours & Co. Inc. "trade name" chlorsulfonated polyethylene], TS -220, TS-320, TS-34
0, TS-430, TS-530, TS-740, TS-930 [above, Toyo Soda Kogyo Co., Ltd. "trade name" chlorsulfonated polyethylene] and the like. Among the trade names mentioned above, TS-220, TS-340, P301, P401 and the like having low crystallinity are preferable.

Other resins include a number average molecular weight of 300 to 30,000 for the purpose of imparting adhesiveness to the modified polyolefin and improving the adhesiveness between the modified polyolefin and the adhesive film.
It is preferably a resin having a liquid or adhesive property in the range of 350 to 20,000 at 50 ° C. and having good compatibility with the modified polyolefin. Specifically, for example, epoxy resin, epoxy resin ester, alkyd resin, epoxy modified alkyd resin, silicone modified alkyd resin, vinyl modified alkyd resin, phenol modified alkyd resin, polyester resin, acrylic resin, urea resin, melamine resin, etc. Can be mentioned. These resins are generally used as a vehicle component, a cross-linking agent component, and a plasticizer component for paints or adhesives, and the compounding amount thereof is 0 based on 100 parts by weight of modified polyolefin in terms of solid content by weight. -100 parts by weight, preferably 10-60 parts by weight.

The organic solvent can be used without limitation as long as it can dissolve the modified polyolefin, but those having a relatively low boiling point are advantageous from the viewpoint of coating workability. Specific examples thereof include aromatic hydrocarbons such as toluene and xylene; aliphatic hydrocarbons such as pentane, hexane, heptane, octane and the like. Further, in addition to the above, ester-based, ketone-based, and alcohol-based organic solvents can be used in combination.

In the method of the present invention, the modified polyolefin can be applied to the surface of the polyolefin-based adherend, dried, and then the pressure-sensitive adhesive film can be pressed to apply the adhesive. The coating can be carried out by a coating method such as spray coating, brush coating or flow coating. The coating film can be dried by natural drying or forced heat drying, and the thickness of the resulting coating film is preferably in the range of 1 to 10 μm.

[Operation] The reason why the adhesive film attached to the surface of the polyolefin adherend coated with the modified polyolefin composition has excellent adhesiveness is considered as follows. That is, the modified polyolefin composition applied to the surface of the polyolefin-based adherend is itself excellent in compatibility with the polyolefin of the adherend and has excellent wettability, so that it is a thin film and has good smoothness. It forms a coating film having excellent properties, and further, since the modified polyolefin has a carboxyl group or a sulfonyl chloride group chemically bonded in the molecular structure, it exhibits excellent adhesion to the adherend. In addition, the modified polyolefin itself has low crystallinity and has relatively high polarity chemical properties, and therefore has excellent compatibility with the pressure-sensitive adhesive of the pressure-sensitive adhesive film, and thus gives an indication of the pressure-sensitive adhesive film having excellent adhesiveness. It is a thing.

[Examples] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

Examples 1 to 9 The modified polyolefin compositions were obtained by mixing and dissolving with the formulations shown in Table-1.

Next, the obtained composition was used as Noblen MH-8 [Mitsubishi Petrochemical Co., Ltd. "trade name" polypropylene, sheet thickness 2 mm].
It was coated with a brush to give a dry film thickness of 4 to 5 μm, and then dried at room temperature for 15 minutes. After that, pressure is applied to the coated sheet with an adhesive film for marking [Vinyl chloride resin film (film thickness 50μ, white) with acrylic resin adhesive coated on its back surface (film thickness 20μ)] The sample was attached and left for 1 day at room temperature, and then used for the test.

Comparative Example In Example 1, the same adherend and pressure-sensitive adhesive film as in Example 1 were used, without using the modified polyolefin composition.

[Effects of the Invention] As described above, in the method of the present invention, the composition containing the modified polyolefin as an essential component is extremely excellent in the adhesiveness between the polyolefin-based adherend and the pressure-sensitive adhesive of the pressure-sensitive adhesive film. Although it has been difficult to attach an adhesive film to a polyolefin-based adherend, a display object can be easily obtained with ease, and the practical effect is remarkable.

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Claims (1)

[Claims] 1. A carboxyl group-containing polyolefin and / or sulfonyl is used when a marking adhesive film comprising a vinyl chloride resin as a base material and an acrylic resin as an adhesive is applied to the surface of a polyolefin adherend. A method of displaying a pressure-sensitive adhesive film for marking, which comprises applying a composition containing a modified polyolefin of a chloride group-containing polyolefin as an essential component to the surface of the polyolefin-based adherend in advance.