JP2564122B2 - Transfer sheet and transfer method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transfer sheet and a transfer method for transferring a layer having an antifogging effect to the surface of an article made of plastic, glass or the like.

[Conventional technology]

 Conventionally, as a method of imparting an antifogging effect to the surface of an object, a method of applying an antifogging paint or a method of forming and laminating an antifogging sheet at the same time.

A method of laminating an anti-fog sheet with an adhesive or pressure-sensitive adhesive.

There is.

[Problems to be solved by the invention]

However, in the above method, the anti-fogging property will be imparted to the already finished product by post-processing, and in reality,
In addition to the steps of coating and drying, there is a problem of solvent recovery, which raises the processing cost and further has the drawback that foreign substances are likely to adhere during coating.

Further, in the above method, when applied to an article having a complicated shape, the material of the sheet is limited in terms of the formability of the sheet, and thus the physical properties of the final product may be deteriorated. For example, when it is applied to a mirror or the like, it loses its transparency and loses its transparency.

Further, the above-mentioned method has the drawback that it is post-processed like the method of (1) and that it cannot be applied to another complicated shape.

[Problems to be solved by the invention]

According to the present invention, the above-mentioned conventional technique cannot impart antifogging property at the same time as molding, and that it cannot be applied to a surface having a complicated shape without deteriorating the physical properties of the final back article. It is about to be resolved.

[Means for solving problems]

In the present invention, by using a transfer sheet in which a transfer sheet is used as a layer for imparting antifogging property, it is possible to eliminate the drawbacks which cannot be solved by the above-mentioned conventional techniques.

Moreover, the above problems can be solved by using a coating film cured by ionizing radiation of ultraviolet rays or electron beams or a saponified saponified cellulose film as the antifogging layer.

That is, the present invention provides (1) a transfer sheet having an antifogging layer composed of any of the following layers as a transfer layer on the release surface of the release sheet.

A saponified triacetyl cellulose film A coating film obtained by curing an ionizing radiation-curable resin composition containing an ionizing radiation-curable and hydrophilic monomer by ionizing radiation irradiation (2) Further on the antifogging layer A transfer sheet having an adhesive layer.

(3) A transfer method in which a transfer sheet having an antifogging layer composed of any of the following layers as a transfer layer on the release surface of the release sheet is used for transfer to a transfer target.

A saponified triacetyl cellulose film A coating film obtained by curing an ionizing radiation curable resin composition containing an ionizing radiation curable and hydrophilic monomer by irradiation with ionizing radiation (4) Further adhering on the antifogging layer A transfer method using a transfer sheet having an agent layer.

Also includes.

[Action]

According to this invention, the antifogging layer is formed as the transfer layer of the transfer sheet, and the transfer sheet is used for transfer. Therefore, the material such as the resin forming the antifogging layer is selected mainly for moldability. Since the material can be used and the release layer of the transfer sheet supports the antifogging layer as the transfer layer, there is no problem in handling.

〔Example〕

The transfer sheet used in the present invention is most simply one having an antifogging layer on the release surface of the releasing sheet, and if necessary, a pattern layer further on the antifogging layer, It has other layers such as an adhesive layer.

Releasable Sheet In principle, the material for the releasable sheet may be one that is used in this type of transfer sheet, and the thickness thereof is preferably 5 to 200 μm, more preferably 12 to 5 μm.
It is 0 μm.

Specific examples include films of synthetic resin such as polyethylene terephthalate (so-called polyester), polypropylene, polyethylene, and polyamide, paper, and synthetic paper. These can be used by laminating if necessary.

The unevenness on the surface of the release sheet determines the unevenness on the surface of the protective layer when transferred. When the surface after the transfer is desired to be a mirror (mirror) surface, the surface of these release sheets must be a mirror surface. In addition, in the case of decorative applications, a matte surface is often required. In this case, a matte film is used as a release sheet, in which the matting agent is kneaded, and the glossy state is adjusted by sandblasting or chemical etching. Good to do.

The release sheet may be made of a material other than the above-mentioned materials, or may be provided with a release layer separately to make the surface releasable.

This releasable layer has a component that enables the protective layer to be peeled off from the base sheet of the transfer sheet during transfer, and specifically, an appropriate vehicle (an example of a vehicle is described below as a vehicle of an ordinary ink composition). It is sufficient to add a releasing agent such as wax or silicone, if necessary, alone or as required.

Anti-fog layer As a method for forming the anti-fog layer, a hydrophilic compound such as polyethylene glycol, a method of applying a water-repellent compound such as a surfactant, paraffin, a fluorine compound or a silicone compound, or the above hydrophilic compound or A method of forming a coating film by dispersing and containing a water-repellent compound in a polymer binder, a method of forming a coating film of a hydrophilic polymer composed of polyvinyl alcohol, polyacrylamide, polyacrylic acid, gelatin, collagen, cellulose, etc. or their derivatives. A method of coating and drying the solution to form a hydrophilic coating film, a method of forming a triacetyl cellulose film and saponifying it, or a monomer that is ionizing radiation curable and hydrophilic, such as hexyl ethyl methacrylate. , Polyethylene glycol diacrylate, hydroxypropyl ac Rate, hydroxybutyl methacrylate, ethylene glycol methacrylate, diethylene glycol methacrylate, tetraethylene glycol methacrylate, methoxydiethylene glycol methacrylate, methoxytriethylene glycol methacrylate, or methoxytetraethylene glycol methacrylate. There is a way to do it, etc.

The thickness of the antifogging layer is 2 to 100 µ, preferably 5 to 20 µ.

Adhesive layer Even if the above uncured resin layer is applied to the transfer target and transferred, a temporary adhesive force can be obtained. However, when it is necessary to further improve the adhesive force, another adhesive layer is used. Should be provided as

As the adhesive for the adhesive layer, known adhesives can be used, and examples thereof include rubber resins such as polyisopropylene rubber, polyisobutyl rubber, styrene butadiene rubber, and butadiene acrylonitrile rubber, (meth) acrylic acid ester resins, Use any adhesive such as polyvinyl ether resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, polystyrene resin, polyester resin, polyamide resin, polychlorinated olefin resin, polyvinyl butyral resin, etc. You can

These resins are diluted as necessary to have a viscosity suitable for application, and then coated by a known coating method, for example, reverse roll coating, roll coating, gravure coating, kiss coating, blade coating, smooth coating, or the like.

In the transfer sheet of the present invention, the method of providing the other layers is almost the same, except that when the layers are provided in a pattern, a printing technique is used.

Pattern layer Since the pattern layer is for imparting a pattern to the transfer target by transfer, it is always necessary in the pattern transfer sheet intended to transfer the pattern. If no picture layer is required, only the antifog layer is transferred. The pattern layer is usually provided directly on the protective layer or indirectly via another layer, and the type of ink may be determined in consideration of the application and the structure of the transfer sheet. An ordinary ink is obtained by kneading a vehicle with a pigment or dye colorant, a plasticizer, a stabilizer, other additives, or a solvent or a diluent.

Among the components of the ink, as binders related to adhesiveness, homopolymers of acrylic or methacrylic monomers such as poly (methyl methacrylate), poly (ethyl methacrylate), poly (ethyl acrylate) and poly (butyl acrylate), or these monomers are used. One or more alcohol-insoluble resins, such as copolymers containing polystyrene, styrene resins such as polystyrene and poly α-styrene, styrene copolymer resins, cellulose acetate, vinyl chloride, polyester resins, etc., are preferably selected and used.

The structure of the transfer sheet is basically as described above. However, if necessary, the following layers can be provided.

Metal thin film layer In order to give the surface of the transferred material a metallic appearance, a metal thin film layer may be provided in place of or in combination with the usual pattern layer. The material for forming the metal thin film layer is aluminum, chromium, tin, silver, copper, gold, etc., and the thickness is usually about 400 to 600Å. The metal thin film layer can be formed into a pattern, if necessary, and a method of applying a water thin film after providing a water-soluble pattern and then applying water, or a resist pattern in an example in which the metal thin film is provided first There is a method in which an acid or an alkali is allowed to act after the provision.

Transfer Method As a transfer method for transferring using a transfer sheet, for example,
A thermal transfer method in which a pattern layer (another layer that is further provided on the pattern layer in some cases) is transferred to the transfer target by heating with a roll press or a flat press to transfer with the uncured resin layer, vacuum.・ Transferability by pressure molding
There is also a solvent activated transfer method in which an activating liquid consisting of a solvent or a solvent solution of a resin is interposed between a transfer sheet and a transfer target, and the method of interest as the transfer method used in the present invention is various. This is a method of applying heat and pressure to the molded plastic product molded by the method, such as injection simultaneous molding, extrusion molding, calender molding and the like.

For example, in injection molding, a transfer sheet may be placed in a mold, the transfer layer and the injected resin may be integrated, and in extrusion molding or calendar molding, heat fusion may be performed immediately when a molded product comes out. . In the molding method, transfer is performed at the same time as molding.
You may perform press molding, vacuum molding, pressure molding, vacuum pressure molding, etc.

Transfer Target Various objects can be used as the transfer target in the present invention, for example, the following.

AAS resin, ABS resin, ACS resin, amino resin, cellulose resin such as cellulose acetate / cellulose cellulose butyrate / ethyl cellulose, allyl resin, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-
Vinyl chloride copolymer, ionomer resin, MBS resin, methacryl-styrene copolymer, nitrile resin, phenol resin, polyamide resin, polyarylate resin, polycarbonate resin, polybutadiene resin, polybutylene terephthalate resin, polyethylene resin, polyethylene terephthalate resin, Plastic molded products such as polymethylmethacrylate resin, polypropylene resin, polyphenylene oxide resin, polystyrene resin, AS resin, polyurethane resin, polyvinyl chloride resin, acrylic modified polyvinyl chloride resin and unsaturated polyester resin.

Extruded products of metals such as iron, aluminum, copper, and stainless steel.

If necessary, the transfer surface of these transfer materials may be subjected to a pretreatment suitable for the material of the transfer material surface. For example, pretreatment for improving adhesion such as primer treatment or corona treatment, coating. For example, the background color adjustment process is performed by other means.

〔The invention's effect〕

According to the present invention, by using a transfer sheet having an antifogging layer formed as a transfer layer, when the antifogging layer is formed on an article, the antifogging layer is imparted by simply transferring by heat. be able to. Further, compared to the method using a conventional anti-fog sheet, there is no problem in applying it to the surface of an object having a complicated shape, and even if a normal release sheet is used, it can be used as a transfer layer. Wide selection of materials for the anti-fog layer makes it easy to apply to surfaces with complex shapes,
If transfer is performed at the same time as molding, there is an advantage that the process can be shortened.

〔Example〕

Transfer sheet A polyester film (Lumirror T-60, manufactured by Toray Industries, Inc., thickness: 38 μm) was used as a release film. Apply melamine resin on one side and bake it to a thickness of 0.
A 3 μm layer was formed.

Next, on the melamine resin layer, a 25% -concentration paint containing acrylic acid and 2-hydroxyethyl acrylate, sorbitan monooleate as a surfactant, and a catalyst was applied, and a layer having a thickness of 10 μm when dried was applied. Was formed.

Further, an acrylic heat-sensitive adhesive layer was applied thereon to have a thickness of 2 μm when dried to obtain a transfer sheet.

Transfer method Using a T-die type extruder, a plate of polycarbonate resin is extruded, and immediately after being extruded from a die, the transfer sheet obtained above is pressure-bonded by a roll so that the heat-sensitive adhesive layer contacts the polycarbonate resin side. Then, it was cooled by using a cooling roll, and after cooling, cut into a desired size, and then the release sheet was peeled off.

The polycarbonate plate thus obtained exhibited good anti-fogging properties, and the above method was extremely excellent in mass productivity.

Transfer method The transfer sheet obtained above is allowed to stand in the mold of an injection molding machine, injection molding is performed so that the injected resin hits the heat-sensitive adhesive layer side, and then a release sheet is applied. I peeled it off.

The acrylic plate thus obtained exhibited good anti-fogging properties, and the above method was extremely excellent in mass productivity.

Transfer method Place the transfer sheet on a transparent acrylic resin plate, and
Transfer processing was performed using a rubber roll heated to 0 ° C., and then the release sheet was peeled off.

The acrylic plate thus obtained exhibited good anti-fogging properties, and the above method was extremely excellent in mass productivity.

Claims (4)

(57) [Claims] 1. A transfer sheet comprising an antifogging layer composed of any of the following layers as a transfer layer on the release surface of a release sheet. Triacetylcellulose film that has been saponified A coating film obtained by curing an ionizing radiation-curable resin composition containing an ionizing radiation-curable and hydrophilic monomer by irradiation with ionizing radiation. 2. The transfer sheet according to claim 1, further comprising an adhesive layer on the antifogging layer. 3. A transfer sheet having an antifogging layer composed of any of the following layers as a transfer layer on the releasable surface of the releasable sheet, which is used for transfer to a transfer target. Transfer method. Triacetylcellulose film that has been saponified A coating film obtained by curing an ionizing radiation-curable resin composition containing an ionizing radiation-curable and hydrophilic monomer by irradiation with ionizing radiation. 4. The transfer method according to claim 3, wherein a transfer sheet further having an adhesive layer on the antifogging layer is used.