JPH039838A - Covering film and method for glueing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating film and a method for applying the same, and more particularly, to a coating film that can form an extremely thin protective film on the surface of an adherend. The present invention relates to a film and a method for applying the same.

[Prior art and problems to be solved by the invention] Covering films are widely used in various fields for the purpose of surface protection. 2. Description of the Related Art A so-called pressure-sensitive adhesive covering film is known, which has a pressure-sensitive adhesive layer laminated thereon.

By the way, in conventional coating films, the thickness of the protective layer is several tens of μm or more, and when the coating film is attached to an adherend, a step is created between the adherend and the protective layer. There are disadvantages such as peeling off from the edge portion, dust etc. accumulating on the edge portion, and poor appearance.

In order to solve this problem, attempts have been made to make the protective layer thinner, but for example, if the thickness of the protective layer is 1.
If it is less than 0 μm, the so-called stiffness of the coating film becomes insufficient, making it extremely difficult to handle. There was a new disadvantage of leaving air bubbles between the layers.

The present invention has been made in view of the above circumstances.

That is, an object of the present invention is to make the protective layer easy to handle even if it is extremely thin, so that it can be coated without wrinkles in the protective layer or leaving air bubbles between the adherend and the protective layer. It is an object of the present invention to provide a covering film that can be firmly attached to an object and a method for adhering the same.

[Means for Solving the Problems] The coating film of the present invention is characterized by having a curable layer, a protective layer, and an adhesive layer in this order on a support, and a method for applying the same. The method is characterized in that after adhering the adherend and the adhesive layer side of the coating film, the curable layer is cured, and then the support and the curable layer are peeled off.

The present invention will be explained in detail below.

The coating film of the present invention can be produced by adhering the adhesive layer side of the coating film to an adherend, and then peeling off the curable layer, which has been cured by a predetermined curing means, together with the support. An adhesive layer and a protective layer are transferred to the body surface, and the surface of the adherend is well protected by the protective layer.

Even if the protective layer and adhesive layer of the present invention are extremely thin, they are reinforced by the support and the curable layer, so they are extremely easy to handle and do not cause wrinkles, etc. Forms an ultra-thin protective layer on the surface of the adherend.

The support is not particularly limited as long as it can support each layer constituting the coating film of the present invention and has excellent adhesion to the curable layer described below. For example, when the material is photocurable, a light-transmitting material is preferable.

Examples of such supports include resin films such as polypropylene, polyethylene, and polyethylene terephthalate.

The thickness of the support is usually 25 to 100 μm, preferably 3
It is 0 to 60 μm.

The curable layer according to the present invention is not particularly limited as long as it has plasticity at room temperature and can be cured by a predetermined curing means, such as photocurable resin and/or thermosetting resin. A layer containing the following can be mentioned.

The photocurable resin is not particularly limited as long as it is a resin that can be cured by irradiation with ultraviolet rays, electron beams, etc., such as double-terminated acryloyl polybutadiene oligomers, epoxy acrylic oligomers, urethane acrylic oligomers, urethane (meth)acryloyl oligomers, polyesters, etc. Acrylic oligomer, alkyd acrylic oligomer, silicone acrylic oligomer (meth)acrylic monomer trimethylolpropane tri(meth)acrylate, polyethylene glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, 1,6-hexanediol(meth)acrylate , neopentyl glycol di(meth)acrylate, diacryloxetyl phosphate, and the like.

Among these, preferred are acryloyl polybutadiene oligomer, urethane (meth)acryloyl oligomer, and alkyd acrylic oligomer.

Examples of thermosetting resins include epoxy resins, alkyd resins, unsaturated polyester resins, and acrylic resins.

Among these, preferred are epoxy resins, alkyd resins, and acrylic resins.

Further, the resin contained in the curable layer may be a resin having both photocurability and thermosetting properties.

In addition, when the resin contained in the curable layer is a photocurable resin, the content is 100 to 30 parts by weight, preferably 1
00 to 70 parts by weight.

When the resin contained in the curable layer is a thermosetting resin, the content thereof is 100 to 30 parts by weight, preferably 100 to 30 parts by weight.
It is 60 parts by weight.

Note that when the curable layer contains a photocurable resin, it is preferable to contain a photoreaction initiator, and when it contains a thermosetting resin, it preferably contains a thermal reaction initiator.

Examples of photoreaction initiators include benzoin compounds such as benzoin methyl ether and benzoin isooctyl ether; benzylacetyl, diethoxyacetophenone,
Carbonyl compounds such as 2-hydroxy-2-methylpropiophenone, methylanthraquinone, acetophenone, benzophenone, and methyl benzoylformate; Sulfur compounds such as diphenyl disulfide and dithiocarbamate; α
-Naphthalene compounds such as chloromethylnaphthalene; metal salts such as iron chloride; and anthracene.

The content of the photoreaction initiator is usually 0.5 to 10 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of the photocurable resin.

Examples of thermal reaction initiators include benzoyl peroxide, di-2-ethylhexyl peroxydicarbonate,
Examples include di-3-methoxybutyl peroxydicarbonate, benzoyl peroxide, and cyclohexane peroxide.

The content of the thermal reaction initiator is usually 0.5 to 5 parts by weight, preferably 0.5 to 1 part by weight, per 100 parts by weight of the thermosetting resin.
Parts by weight.

In addition to these, the curable layer according to the present invention may contain a thermoplastic resin, a filler, an extender, an antifoaming agent, and other compounding agents, if desired.

The protective layer according to the present invention is not particularly limited as long as it has excellent mechanical strength and does not impede the purpose of the present invention, and examples thereof include polyethylene terephthalate, saturated polyester, polyphenylene sulfide, polyimide, and the like.

The thickness of the protective layer is usually 2 to 15 μm, preferably 2 to 6 μm.
It is μm.

The adhesive layer referred to in the present invention refers to a layer containing an adhesive and/or an adhesive.

As the adhesive, known adhesives can be suitably used, such as acrylic adhesives, rubber adhesives, emulsion adhesives, polyurethane adhesives, water-based adhesives, etc. .

As the adhesive, known adhesives can be suitably used, such as so-called one-liquid curable epoxy resins, photocurable adhesives, thermosetting adhesives, hot melt adhesives, etc. can.

The thickness of the adhesive layer is usually 2 to 20 μm, preferably 5 to 20 μm.
It is 15 μm.

In the coating film of the present invention, a coloring layer may be provided between the curable layer and the protective layer and/or between the protective layer and the adhesive layer.

The colorant layer is a layer mainly containing dyes, pigments, and the like.

By providing the coloring agent layer in this way, the covering film can also be used as a decorative film, and by forming, for example, characters, figures, or symbols with the coloring agent layer, it can also be used as a so-called label. You can also do it.

The thickness of the colorant layer is usually 0.5 to 5 μm, preferably 1 to 5 μm.
It is 3 μm.

Such a coating film of the present invention can be obtained by laminating each of the layers to a predetermined thickness on the support.

In producing the coating film of the present invention, it is preferable to subject the side of the support in contact with the curable layer to the surface treatment described below.

The surface treatment prevents the curable layer from peeling off from the support and remaining on the protective layer side when the support and the curable layer are peeled off from the coating film.

Examples of the surface treatment include providing fine irregularities on the surface by corona discharge or the like, and providing a primer layer on the surface.

In any case, there are no particular limitations as long as the method can improve the adhesion between the support and the curable layer.

Further, for the same purpose as the surface treatment, a release agent layer can be provided on the side of the curable layer that comes into contact with the protective layer.

Examples of the release agent layer include layers containing silicone, long-chain alkyl release agents, ultrafine particles, and the like.

The thickness of the release agent layer is usually 0.05 to 2 μm.

The method for laminating each of the layers on the support is not particularly limited as long as each layer can be laminated to a predetermined thickness, and suitable methods include, for example, coal printing, spuse method, screen printing, doctor knife coating, etc. can be adopted.

Next, a method for applying the coating film of the present invention will be described below.

First, the adhesive layer side of the coating film is attached to an adherend.

Next, the curable layer of the coating film is cured.

When the curable layer contains a photocurable resin, methods for curing the curable layer include, for example, light irradiation, ultraviolet irradiation,
A method such as electron beam irradiation can be adopted, and when the curable layer contains a thermosetting resin, a method of heating using an electric heater, a method of heating using an infrared lamp, etc. can be adopted as appropriate. Can be selected and adopted.

In any case, there are no particular limitations as long as the curable layer can be cured and the object of the present invention is not hindered.

Next, the support and the cured curable layer are peeled off from the coating film, leaving the protective layer and adhesive layer on the adherend side.

In addition, in the method for attaching the coating film of the present invention,
If the adhesive layer has curability, the protective layer and the adhesive layer remaining on the adherend may be further heated or irradiated with light to harden the adhesive layer more firmly. Adhesion to the adherend and protection of the adherend can be improved.

[Example] Next, examples and comparative examples will be shown with reference to the figures,
The present invention will be explained in more detail.

(Example 1) A biaxially oriented polypropylene film (thickness: 30 μm) whose surface was subjected to corona discharge treatment was used as a support, and after uniformly kneading the composition for a curable layer shown below, this was added to the support. Spread it on top to a thickness of 20 μm (dry layer thickness), and
Dry at ℃ for 10 minutes.

In addition, the curable layer after drying had adhesiveness.

Nezukita [formerly 1 Chiso 1] Acrylic rubber...25 parts by weight (Door Akron PS-210 [manufactured by Toa Paint ■]) Urethane acrylic resin...75 parts by weight (Goselac UV)
-4200B [manufactured by Nippon Gosei ■]) Coronate 2030・・・・・・・・・1 part by weight (manufactured by Nippon Polyurethane ■) Photoinitiator・・・・・・・・・3 parts by weight (Gilochea 1173 [Manufactured by Merck & Co.]) Toluene...
...140 parts by weight Separately, a solvent-based acrylic adhesive (Arontack S-1601 [
An adhesive layer was formed by coating the adhesive layer (manufactured by Toagosei Kagaku ■) to a dry thickness of 7 μm, and this was dried at 80° C. for 5 minutes.

Next, as shown in FIG. 1, the support having the curable layer and the protective layer having the adhesive layer are laminated and wound around a roll to form the support 1, the curable layer 2, and the protective layer. 3 and adhesive layer 4 (thickness: 54 μm)
was manufactured.

From this coating film, lOc m X lOc m
The film was cut out as a sheet, and the adhesive layer side of the covering film was attached to the photo area of a paper poster.

Although the protective layer of the covering film is extremely thin at 2 μm, it is extremely easy to apply and can be applied to the photographic area without creating wrinkles or bubbles. did it.

Next, the curable layer was cured by irradiating this coating film with ultraviolet rays for 2 seconds from a distance of 15 cm using an IkW high-pressure mercury lamp.

The cured curable layer and support were peeled off from the coating film.

The curable layer lost its tackiness and was easily separated from the support.

There were no wrinkles in the protective layer remaining in the photographic area, and no air bubbles were observed between the photographic area and the protective layer.

In the photographic area, the protective layer was extremely thin, so there was no feeling of adhesion.

(Comparative Example 1) The same adhesive layer as in Example 1 was provided on the same protective layer as in Example 1.

This was pasted on the same photographic area as in Example 1.

When attaching this protective layer and adhesive layer to the photographic area, it is extremely inconvenient to handle because the protective layer and adhesive layer have no stiffness, and the resulting protective layer has many wrinkles. Also, many air bubbles were observed between the photographic area and the protective layer.

(Example 2) Polyethylene terephthalate film (
After uniformly kneading the composition for a curable layer shown below, this was applied onto the support to a thickness of 20 μm.
It was spread to a thickness of .mu.m (dry layer thickness) and dried at 80.degree. C. for 5 minutes.

In addition, the curable layer after drying had adhesiveness.

Hard Shin a former 1 absorbent acrylic rubber 15 parts by weight (Noxtite 7885-NL [manufactured by Nippon Metocron ■]) Urethane acrylic resin 80 parts by weight (UA-
3061 [manufactured by Kyoeisha Yushi Kagaku ■]) Epoxy resin...
......5 parts by weight (Epon 1007 [manufactured by Dow Chemical Company]) Lauroyl peroxide...0.5 parts by weight Toluene...Fist...140 f [Okibe this and Separately, color printing was provided as a coloring agent layer on the surface of a polyethylene terephthalate film (thickness: 6 μm) as a protective layer.

On this protective layer, from the color printing side, a mixture of the adhesive layer composition shown below was spread uniformly to a thickness of 5 μm (dry layer thickness), and on the protective layer, from the side without color printing, A similar spread was prepared and dried at 80° C. for 3 minutes.

Note that the adhesive layer had tackiness after drying.

Goishi 3154 Old 1 Boso Polyacrylic Acid Ester Resin...100 parts by weight Araldite Y-261...80 parts by weight (manufactured by Ciba Geigy) Dicyanamide......5 parts by weight ( (manufactured by Nippon Carbide) Aerosil No. 300...10 parts by weight (manufactured by Nippon Aerosil) Toluene...140 parts by weight Next, add the previous curable layer. The support l, which has a protective layer having two types of adhesive layers and a colorant layer, are laminated and wound up into a roll to form a support l, as shown in FIG.
A coating film (thickness 54 μm) comprising a curable layer 2, a colorant layer 5, a protective layer 3, and an adhesive layer 4 in this order, and a third
As shown in the figure, a support 1, a curable layer 2, a protective layer 3, a colorant layer 5. A coating film having adhesive layers 4 in this order was produced.

From this coating film, 1Ocm x 1
It was cut into a 0 cm sheet, and the adhesive layer side of the coating film was attached to a coated steel plate.

Although the coating film has an extremely thin protective layer of 2 μm in thickness, it is extremely easy to apply and does not create wrinkles or bubbles on the coated steel sheet. I was able to do that.

Next, these coating films were heated at 130°C for 15 minutes.
The curable layer was cured by heating for minutes.

The cured curable layer and support were peeled off from the coating film.

The curable layer lost its tackiness and was easily separated from the support.

There were no wrinkles in the protective layer remaining on the painted steel plate, and no air bubbles were observed between the coated steel plate and the protective layer.

The painted steel surface was coated with an extremely thin protective layer of color printing.

(Example 3) Polyethylene film (thickness 30 μm) as a support
After uniformly kneading the composition for a curable layer shown below using -, this was spread on the support to a thickness of 15 μm (dry layer thickness) and dried at 90° C. for 5 minutes.

In addition, the curable layer after drying had adhesiveness.

Hard Shin J''l Old 1-bottom acrylic rubber 35 parts by weight (Door Akron PS-210 [manufactured by Toa Paint ■]) Urethane acrylic resin 65 parts by weight (Goselac UV
-42008 [manufactured by Nippon Gosei ■]) Foral AX・・・・・・15 parts by weight (manufactured by Rika Harkieless ■) Photoreaction initiator・・・・・・・・・5 parts by weight (Irgacure 184) [Made by Ciba Geigy]) Toluene...
・・・・・・140 parts by weight Separately, polyethylene terephthalate film (thickness 2 μm) as a protective layer
A uniformly kneaded adhesive layer composition shown below was spread on top to a thickness of 5 μm (dry layer thickness) and heated at 70°C for 3
Dry for a minute.

Note that the adhesive layer had tackiness after drying.

Rear 11 ■l Old 1-bottom acrylic urethane resin...60 parts by weight (Thiocol [manufactured by Nomura Office ■]) Saturated polyester resin...40 parts by weight (Byron 200 [manufactured by Toyobo ■) ) Photoreaction initiator: 3 parts by weight (Darocur 1173 [manufactured by Merck & Co., Ltd.]) Toluene:
...140 weight 11 parts Next, as shown in FIG. 1, the support having the curable layer and the protective layer having the adhesive layer are laminated and wound around a roll to form the support l. ,
A coating film (thickness: 54 um) consisting of a curable layer 2, a protective layer 3 and an adhesive layer 4 was produced.

A 10 cm diameter adhesive label was punched out from this coating film, and the adhesive layer side of the coating film was attached to a motorcycle body protection plate.

Although the protective layer of the covering film is extremely thin at 2 μm, it is extremely easy to apply and can be applied to the body protection plate without creating wrinkles, bubbles, etc. was completed.

Next, the curable layer was cured by irradiating this coating film with ultraviolet rays for 3 seconds from a distance of 15 cm using a 1 kW high-pressure mercury lamp.

The cured curable layer and support were peeled off from the coating film.

The curable layer lost its tackiness and was easily separated from the support.

There were no wrinkles in the protective layer remaining on the body protective plate, and no air bubbles were observed between the body protective plate and the protective layer.

Further, the curable layer was further cured by irradiating the protective layer with ultraviolet rays for 1 second again.

The protective layer of the body protection plate was extremely thin, so there was no feeling of adhesion (and the adhesion between the body protection plate and the protective layer was extremely good).

[Effects of the Invention] According to the present invention, (1) Even if the protective layer is extremely thin, it is easy to handle, and as a result, wrinkles do not occur in the protective layer, and air bubbles do not occur between the adherend and the protective layer. It can be firmly attached to the adherend without leaving any residue.

(2) Also, by providing a coloring layer on the protective layer and/or adhesive layer, it can be used for decorative films, labels, etc.; By curing, it is possible to provide a coating film and a method for adhering the same, which have advantages such as being able to improve protection performance for the surface of an adherend.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views illustrating the coating film of the present invention. l...Support 2...Curable layer 3...Protective layer 4...Adhesive layer 5...Coloring layer

Claims (3)

[Claims] (1) A coating film comprising a curable layer, a protective layer, and an adhesive layer in this order on a support. (2) The coating film according to claim 1, which has a colorant layer between the curable layer and the protective layer and/or between the protective layer and the adhesive layer. (3) After adhering the adherend and the adhesive layer side of the coating film, the curable layer is cured, and then the support and the curable layer are peeled off. Or the method for attaching a coating film according to 2.