JP6245178B2 - Transfer film, method for producing molded product, and method for producing transfer film - Google Patents

Description

The present invention relates to a transfer film that is transferred simultaneously with molding, a method for producing a molded product using the same, and a method for producing a transfer film , and more particularly, a transfer film suitable for decorating industrial products, and a molded product using the same. And a transfer film manufacturing method .

  Molded articles using the simultaneous molding and decorating transfer film are used for equipment bodies such as daily necessities and daily necessities, containers for food and various articles, casings for electronic equipment and office supplies, and the like. The simultaneous molding decorative transfer film is a plastic decorative molding transfer film provided by laminating a release layer, a decorative printing layer, and an adhesive layer on a base film. In the molding technique using this simultaneous molding decorative transfer film, the simultaneous molding decorative transfer film is supplied between a pair of injection molding dies, and heated and pressed into a cavity formed by the injection molding dies. After filling the molding resin and molding the molded product, the transfer film is adhered to the molded product, and then the molded product to which the transfer film is adhered is taken out of the cavity, and then the base film and the release layer are peeled off. This is a molding method in which a decorative printing layer is transferred to a molded product for decoration.

When using a simultaneous molding decorative transfer film for the decoration of industrial products, the industrial products are expected to be used for a long time or in harsh environments. A transfer film having a high surface strength is required. Therefore, a molded simultaneous decorating transfer film in which a hard coat layer is formed on a release layer and a printed layer, an adhesive layer and the like are further formed thereon is used for decorating industrial products.
In general, a thermosetting resin or an ultraviolet curable resin is used as a coating solution for forming a hard coat layer (that is, a coating solution for a hard coat layer). Comparing the thermosetting resin and the ultraviolet curable resin, the ultraviolet curable resin is generally superior in surface hardness, chemical resistance, abrasion resistance, and scratch resistance. Therefore, it is a mainstream to use an ultraviolet curable resin for the coating solution for the hard coat layer.

However, when an ultraviolet curable resin is used for the coating solution, the coating film becomes brittle when the coating film is irradiated with ultraviolet rays and the ultraviolet curable resin of the coating film is cured at the time of forming the simultaneous decorative transfer film. Thus, cracks occur in the hard coat layer during injection molding. On the other hand, the blocking resistance is poor unless the coating film is cured at all. Therefore, there is a method in which the coating film before transfer is semi-cured to make the coating film tack-free and irradiated with ultraviolet rays after molding and transferring to completely cure the ultraviolet curable resin.
As a method of semi-curing the coating film before transfer, there is a method of semi-curing an ultraviolet curable resin by irradiating the coating film with ultraviolet rays in the first stage when forming a simultaneously decorated decorative transfer film (for example, Patent Document 1). ).

  However, the method of irradiating the coating film with ultraviolet rays in the first stage when creating a simultaneous decorative transfer film is subject to variations in the irradiation intensity and reproducibility of the ultraviolet irradiator, so control the curing of the UV curable resin. Is difficult. If the ultraviolet curable resin is not semi-cured by the first stage irradiation of ultraviolet rays, the coating film containing the ultraviolet curable resin does not become tack-free and causes blocking. On the other hand, if the semi-curing of the ultraviolet curable resin by the first-stage irradiation of ultraviolet rays is excessive, it causes cracks during injection molding. However, the curing reaction of an ultraviolet curable resin generally has a high reaction rate, and a dark reaction proceeds even after irradiation with ultraviolet rays. Therefore, it is difficult to control the curing of the ultraviolet curable resin.

  Therefore, there is a method in which the coating liquid is composed of a coating liquid containing acrylic polyol and isocyanate, and the coating film is heated to cause the hydroxyl group of the acrylic polyol and isocyanate to react with each other, thereby bringing the coating film into a tack-free state. There is (for example, Patent Document 2). The transfer film thus obtained is transferred to the surface simultaneously with the molding of the molded product, and then the ultraviolet radiation is irradiated to the transferred radiation curable resin layer to cause the unsaturated bonds of the acrylic polyol to react with each other. To completely cure.

Japanese Patent Application Laid-Open No. 2011-21051 JP 2009-137219 A

By the way, when a coating film is formed using a coating liquid containing acrylic polyol and isocyanate and heated to a tack-free state, if the coating film is excessively cured, a hard coat layer is formed during injection molding. Cracks occur. Furthermore, when the coating film is irradiated with ultraviolet rays after molding, the isocyanate tends to inhibit the radical reactivity of the acrylic polyol and lower the surface hardness.
The present invention is intended to solve such problems, and can reduce cracks in the hard coat layer that occur during transfer, and by irradiating the radiation curable resin layer with ultraviolet rays after molding. An object of the present invention is to provide a molded simultaneous decorative transfer film capable of forming a hard coat layer with sufficient hardness.

One aspect of the present invention for solving the above problem is that in a transfer film having a radiation curable resin layer that can be peeled on a base film, the radiation curable resin layer comprises a radiation curable resin and a thermosetting agent. A transfer film obtained by heat-curing a coating film coated with a coating liquid containing the coating film, and having a hardness of B or less when a pencil hardness test is performed under the measurement conditions of the JIS-K5600 method .
In the above transfer film, the radiation curable resin layer may have a hardness of 4B or more when a pencil hardness test is performed under the measurement conditions of the JIS-K5600 method.
In the above transfer film, the thermosetting agent may be an isocyanate compound.
Moreover, in the above transfer film, a decorative print layer may be provided on the radiation curable resin layer.
The transfer film may further include a primer layer formed between the radiation curable resin layer and the decorative print layer.

Another aspect of the present invention includes a step of supplying the transfer film described above between a pair of injection molds, and molding by heating and pressurizing a cavity formed by the injection mold supplied with the transfer film Filling the resin and molding the molded product, and simultaneously adhering the radiation curable resin layer of the transfer film to the molded product; taking out the molded product from the injection mold; and And a step of irradiating the radiation curable resin layer on the surface of the molded article to cure the radiation curable resin layer. Is the method.
Another aspect of the present invention is a molded article manufactured by the above-described method for manufacturing a molded article.

Since the transfer film according to one embodiment of the present invention has a low pencil hardness of the radiation curable resin layer disposed on the base film and is soft, the transfer film is placed in an injection mold so that a resin molded product is obtained. Even if it is transferred at the same time as molding, cracks do not occur during the transfer. Further, since this layer is obtained by heat-curing a thermosetting resin coating film, it is excellent in blocking resistance. For example, if the pencil hardness is 4B or more, blocking does not occur.
In addition, after transferring the transfer film which concerns on 1 aspect of this invention to a resin molded product, a radiation-curable resin layer can fully be hardened by irradiating a radiation to this radiation-curable resin layer. A sufficiently cured radiation curable resin layer (hard coat layer) can withstand long-term use and use in harsh environments.

It is sectional drawing of an example of the shaping | molding simultaneous decorating transfer film which concerns on embodiment of this invention. It is sectional drawing of an example of the shaping | molding simultaneous decorating transfer film which concerns on embodiment of this invention. It is sectional drawing of an example of the molded product which transcribe | transferred the shaping | molding simultaneous decoration transfer film which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an example of a simultaneous molding decorative transfer film according to an embodiment of the present invention. A simultaneous simultaneous decorative transfer film 100 according to this embodiment includes a base film 1, a release layer 2, and radiation curing. It is a laminated body composed of the conductive resin layer 3, the decorative printing layer 4, and the adhesive layer 5. Here, usually, the decorative print layer 4 is often a plurality of layers, and it is also possible to include a decorative material having an optical effect such as embossing or pearl pigment. In addition, when the decorative printed layer 4 has sufficient adhesiveness with respect to a molded product, the adhesive layer 5 may not be provided.

FIG. 2 is a cross-sectional view of an example of the simultaneous molding and decorating transfer film according to the embodiment of the present invention. The simultaneous decorating and transferring film 101 according to the present embodiment includes a base film 1, a release layer 2, and radiation curing. It is a laminated body composed of a conductive resin layer 3, a primer layer 6, a decorative printing layer 4, and an adhesive layer 5.
FIG. 3 is a cross-sectional view of an example of a molded article after the simultaneous molding decorative transfer film according to the embodiment of the present invention is transferred simultaneously with injection molding. The structure of the molded product is composed of an adhesive layer 5, a decorative printing layer 4, and a radiation curable resin layer 3 on a molding resin 7.

Hereinafter, each layer of the simultaneously molded decorative transfer films 100 and 101 according to the embodiment of the present invention will be described.
Examples of the base film 1 include base materials such as polyethylene terephthalate film, polyethylene naphthalate film, polypropylene film, polyethylene film, triacetyl cellulose film, polycarbonate film, nylon film, cellophane film, acrylic film, PVC film, and PET-G film. Can be used. Preferably, a film of polyester resin such as polyethylene terephthalate or polyethylene naphthalate is optimal in terms of heat resistance and mechanical strength. The usable film thickness is from 25 μm to 150 μm, and preferably from 38 μm to 50 μm in terms of moldability and cost.

  The release layer 2 has the most important releasability from the radiation curable resin layer (hard coat layer) 3, but also requires heat resistance, solvent resistance, top coatability and stretchability. For example, a cured product such as melamine resin, polyolefin resin, urethane resin, or cellulose acetate can be used. Among them, the release layer 2 using melamine resin is usually used in many cases, but it requires a baking process at a high temperature (140 ° C. to 200 ° C.) and generates / contains harmful formaldehyde. As a result, a cured product of an acrylic polyol and a long-chain alkyl group-containing acrylic or / and silicone-modified acrylic resin or polyisocyanate is optimal as the release layer 2.

The radiation curable resin layer 3 needs to be made of a resin that can be crosslinked by irradiating with radiation such as ultraviolet rays or electron beams after being transferred to a molded product. The radiation curable resin layer 3 needs to be heat-cured.
In order to form such a radiation curable resin layer 3, a coating liquid containing a radiation curable resin and a thermosetting agent may be used. After applying this coating solution to form a coating film, the radiation curable resin layer 3 can be formed by heating and curing the coating film.
As the radiation curable resin, a resin curable by ultraviolet irradiation or a resin curable by electron beam irradiation can be used. In any case, a monomer or oligomer having an ethylenically unsaturated bond and a polymerization initiator can be preferably used. When an ultraviolet polymerization initiator is contained as a polymerization initiator, the radiation curable resin is cured by irradiation with ultraviolet rays. Moreover, when an electron beam polymerization initiator is contained as a polymerization initiator, the radiation curable resin is cured by irradiation with an electron beam.

  Monomers that can be used in the radiation curable resin include, for example, monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylprolidone, and polyfunctional monomers such as trimethylol. Propane (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexane Diol di (meth) acrylate, neopentyl glycol (meth) acrylate, etc. can be used. Examples of the oligomer that can be used for the radiation curable resin include urethane acrylate, epoxy acrylate, and polyester acrylate. In particular, an acrylic acrylate having low shrinkage and tack-free property when uncured is optimal.

  Moreover, as a thermosetting agent, an isocyanate compound, an epoxy resin, a phenol resin, a melamine resin, a urea resin, an unsaturated polyester resin, an alkyd resin, polyurethane, a thermosetting polyimide, etc. can be used. Preferably, an isocyanate compound having excellent low-temperature curability is desirable. In addition, when using an isocyanate compound as a thermosetting agent, it is desirable to use what has a hydroxyl group as said monomer or oligomer. For example, trimethylolpropane (meth) acrylate, hexanediol (meth) acrylate, acrylic acrylate, and the like.

  The radiation curable resin layer 3 according to this embodiment needs to have a hardness of B or less when a pencil hardness test is performed under the measurement conditions of the JIS-K5600 method. The molded simultaneous decorative transfer film including the radiation curable resin layer 3 having a hardness of HB or more generates a large crack during transfer, and remarkably deteriorates the appearance of the molded product. Moreover, it is desirable that the hardness of the radiation curable resin layer 3 is 4B or more. When the hardness of the radiation curable resin layer 3 is adjusted to 4B or more, a molded simultaneous decorating transfer film having excellent blocking resistance can be produced.

The pencil hardness varies depending on the content of the thermosetting agent contained in the coating solution and the heating conditions of the coating film formed by applying the coating solution. In general, the pencil hardness increases as the content of the thermosetting agent increases. Also, the higher the heating temperature and the longer the heating, the higher the pencil hardness. The heating temperature and the heating time are determined in consideration of the hardness of the radiation curable resin layer 3 to be obtained. Generally, the heating temperature and the heating time may be heated at 80 ° C. to 180 ° C. for 2 seconds to 60 seconds.
In order to obtain high surface hardness, nano silica particles may be added to the coating solution. The nanosilica particles preferably have a particle diameter of 10 nm to 100 nm in order to maintain transparency. The nanosilica particles are preferably surface-treated with an acryloyl / methacryloyl group-containing silane coupling agent or the like, but may be mere untreated silica particles.

  As a material for the decorative print layer 4, a colored ink containing a pigment or dye of an appropriate color as a colorant can be used. The decorative printing layer 4 is formed by special printing such as pearl, fluorescence, mirror, retroreflection, magnetic printing, embossing to form a concavo-convex structure (various lens effects and holograms) by heat and ultraviolet rays, aluminum and silver. , Chromium, titanium oxide, zinc sulfide, or the like can be used for forming a thin film by vacuum deposition or sputtering.

The adhesive layer 5 adheres each of the above layers to the surface of the molded product. As the adhesive layer 5, a heat-sensitive or pressure-sensitive resin suitable for the molding resin 7 can be used as appropriate. Examples of the adhesive layer 5 include vinyl acetate resin, ethylene vinyl acetate copolymer resin, vinyl acetate resin, acrylic resin, butyral resin, epoxy resin, polyester resin, and polyurethane resin. In addition, when the decorative printed layer 4 has sufficient adhesiveness with respect to a molded product, the adhesive layer 5 may not be provided.
When the adhesion between the radiation curable resin layer 3 and the decorative printing layer 4 is difficult, a primer layer 6 may be provided between the radiation curable resin layer 3 and the decorative printing layer 4. As the primer layer 6, a resin suitable for maintaining close contact between the radiation curable resin layer 3 and the decorative printing layer 4 can be used as appropriate.

  The formation method of each layer of this embodiment can adopt an existing coating / printing method, for example, direct gravure, gravure reverse, micro gravure, roll coat, curtain coat, die coat, spray coat, Meyer coat, comma coat. , Screen printing, flexographic printing and the like. In particular, from the viewpoint of surface properties and film thickness, it is desirable to apply by a microgravure method. Although drying conditions depend on the solvent used, drying is usually sufficient by drying at 80 ° C. to 180 ° C. for 2 seconds to 60 seconds. However, depending on the thickness and type of coating solution, additional drying may be required for several tens of seconds with heat of 120 ° C. to 180 ° C. in order to reduce residual solvent and accelerate the two-component curing reaction.

  In the manner described above, the simultaneously molded decorative transfer film 100 is prepared. Then, a molded product can be manufactured by in-mold molding using this simultaneous molding decorative transfer film 100. In-mold molding is performed by inserting the molding simultaneous decorative transfer film 100 into an injection molding die, and molding resin 7 from the decorative printing layer 4 side of the molding simultaneous decorative transfer film 100 into the cavity of the injection molding die. Is formed by injection molding to transfer the molding simultaneous decorative transfer film 100 onto the surface of the molding resin 7, and after cooling, the mold for injection molding is released, and the base film 1 and the mold release of the simultaneous molding decorative transfer film 100 are released. It can be performed in a known order in which the layer 2 is peeled off and the molded product 200 is taken out.

Since the radiation curable resin layer 3 of the simultaneous decorating transfer film 100 according to the present embodiment contains an ultraviolet curable resin, the exposure amount is 500 mJ / cm ^{2 to} 1500 mJ / cm with a high-pressure mercury lamp or a metahalide lamp after molding. ^A hard coat layer is formed by curing by irradiating about 2 to obtain a molded product 200 satisfying various physical properties (steel wool test, pencil hardness, etc.).
In addition, the molded product which further provided the primer layer 6 in the molded product 200 can also be obtained by using the shaping | molding simultaneous decorating transfer film 101. FIG.
Examples of the present invention and comparative examples will be described below.

Example 1
On the biaxially stretched polyester film (G440E50 manufactured by Mitsubishi Plastics) having a thickness of 50 μm as the base film 1, the release layer coating solution formulated as follows was applied in a dry thickness of 0.4 μm by the microgravure method and dried. A release film was aged by aging at 5 ° C for 5 days.
・ Release layer coating solution Toei Kasei LC # 6560 (acrylic polyol) ... 100 parts by weight NOF FS730 (silicone-modified acrylic resin) ... 20 parts by weight Nippon Polyurethane Coronate L (isocyanate compound) 20 parts by weight

Subsequently, the following hard coat layer coating solution as the radiation curable resin layer 3 was applied by a thickness of 5.0 μm by a micro gravure method, and heated for several tens of seconds by heat at 120 ° C. to 180 ° C. At this time, when the pencil hardness test was performed under the measurement conditions of the JIS-K5600 method, the hardness of the radiation curable resin layer (hard coat layer) 3 was 2B.
・ Coating solution for hard coat layer DIC RC29-117 (Tack-free UV curable resin with UV polymerization initiator: solid content 30%) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 100 parts by weight Nissan Chemical silica MEK dispersion (silica particle size 10-20 nm: solid content 30%) ... 20 parts by weight

Nippon Polyurethane Coronate HL (isocyanate compound) 5 parts by weight Subsequently, printing is performed with a predetermined decorative printing layer coating solution, and the adhesive layer 5 is coated with an adhesive layer coating solution (Toyo Ink K539HP adhesive varnish) by a gravure method. A dry 1 μm thick coating was applied to obtain a molded simultaneous decorative transfer film 100 according to Example 1. The simultaneously decorated decorative transfer film 100 was fixed to an injection mold, and the mold was clamped to injection-mold a PC / ABS resin. After cooling, the mold for injection molding is opened, the base film 1 of the simultaneous decorative decorative transfer film 100 is peeled off from the molded product together with the release layer 2, and the integrated light quantity is 1000 mJ / The molded product 200 was obtained by irradiating with cm ² ultraviolet rays.

(Example 2)
In the same manner as in Example 1, a release layer coating solution was applied on the base film 1 by a micro gravure method, dried to a thickness of 0.4 μm, dried, and then aged at 50 ° C. for 5 days to obtain a release film.
Subsequently, the following hard coat layer coating solution as the radiation curable resin layer 3 was applied by a thickness of 5.0 μm by a micro gravure method, and heated for several tens of seconds by heat at 120 ° C. to 180 ° C. At this time, when a pencil hardness test was performed under the measurement conditions of the JIS-K5600 method, the hardness of the radiation curable resin layer (hard coat layer) 3 was B.
・ Coating liquid for hard coat layer Hitachi Chemical 7988 (tack-free UV curable resin with UV polymerization initiator: solid content 35%) ... 100 parts by weight Mitsui Chemicals Takenate D-110N (isocyanate compound), 4 parts by weight

Subsequently, in the same manner as in Example 1, printing was performed with a predetermined decorative printing layer coating solution, and an adhesive layer coating solution (K539HP adhesive varnish manufactured by Toyo Ink) was applied as a bonding layer 5 by dry gravure coating to a thickness of 1 μm. Thus, a simultaneously molded decorative transfer film 100 according to Example 2 was obtained. The simultaneously decorated decorative transfer film 100 was fixed to an injection mold, and the mold was clamped to injection-mold a PC / ABS resin. After cooling, the mold for injection molding is opened, the base film 1 of the simultaneous decorative decorative transfer film 100 is peeled off from the molded product together with the release layer 2, and the integrated light quantity is 1000 mJ / The molded product 200 was obtained by irradiating with cm ² ultraviolet rays.

(Example 3)
In the same manner as in Example 1, a release layer coating solution was applied on the base film 1 by a micro gravure method, dried to a thickness of 0.4 μm, dried, and then aged at 50 ° C. for 5 days to obtain a release film.
Subsequently, the following hard coat layer coating solution as the radiation curable resin layer 3 was applied by a thickness of 5.0 μm by a micro gravure method, and heated for several tens of seconds by heat at 120 ° C. to 180 ° C. At this time, when the pencil hardness test was performed under the measurement conditions of the JIS-K5600 method, the hardness of the radiation curable resin layer (hard coat layer) 3 was 4B.
・ Coating liquid for hard coat layer Hitachi Chemical 7988 (tack-free UV curable resin with UV polymerization initiator: solid content 35%) ... 100 parts by weight Mitsui Chemicals Takenate D-110N (isocyanate compound) 2 parts by weight

Subsequently, in the same manner as in Example 1, printing was performed with a predetermined decorative printing layer coating solution, and an adhesive layer coating solution (K539HP adhesive varnish manufactured by Toyo Ink) was applied as a bonding layer 5 by dry gravure coating to a thickness of 1 μm. Thus, a simultaneously molded decorative transfer film 100 according to Example 3 was obtained. The simultaneously decorated decorative transfer film 100 was fixed to an injection mold, and the mold was clamped to injection-mold a PC / ABS resin. After cooling, the mold for injection molding is opened, the base film 1 of the simultaneous decorative decorative transfer film 100 is peeled off from the molded product together with the release layer 2, and the integrated light quantity is 1000 mJ / The molded product 200 was obtained by irradiating with cm ² ultraviolet rays.

(Comparative Example 1)
In the same manner as in Example 1, a release layer coating solution was applied on the base film 1 by a micro gravure method, dried to a thickness of 0.4 μm, dried, and then aged at 50 ° C. for 5 days to obtain a release film.
Subsequently, the following hard coat layer coating solution as the radiation curable resin layer 3 was applied by a thickness of 5.0 μm by a micro gravure method, and heated for several tens of seconds by heat at 120 ° C. to 180 ° C. At this time, when the pencil hardness test was performed under the measurement conditions of the JIS-K5600 method, the hardness of the radiation curable resin layer (hard coat layer) 3 was HB.
・ Coating liquid for hard coat layer Hitachi Chemical 7988 (tack-free UV curable resin with UV polymerization initiator: solid content 35%) ... 100 parts by weight Mitsui Chemicals Takenate D-110N (isocyanate compound), 5 parts by weight

Subsequently, in the same manner as in Example 1, printing was performed with a predetermined decorative printing layer coating solution, and an adhesive layer coating solution (K539HP adhesive varnish manufactured by Toyo Ink) was applied as a bonding layer 5 by dry gravure coating to a thickness of 1 μm. Thus, a simultaneously molded decorative transfer film 100 according to Comparative Example 1 was obtained. The simultaneously decorated decorative transfer film 100 was fixed to an injection mold, and the mold was clamped to injection-mold a PC / ABS resin. After cooling, the mold for injection molding is opened, the base film 1 of the simultaneous decorative decorative transfer film 100 is peeled off from the molded product together with the release layer 2, and the integrated light quantity is 1000 mJ / The molded product 200 was obtained by irradiating with cm ² ultraviolet rays.

(Comparative Example 2)
In the same manner as in Example 1, a release layer coating solution was applied on the base film 1 by a micro gravure method, dried to a thickness of 0.4 μm, dried, and then aged at 50 ° C. for 5 days to obtain a release film.
Subsequently, the following hard coat layer coating solution as the radiation curable resin layer 3 was applied by a thickness of 5.0 μm by a micro gravure method, and heated for several tens of seconds by heat at 120 ° C. to 180 ° C. At this time, when the pencil hardness test was performed under the measurement conditions of the JIS-K5600 method, the hardness of the radiation curable resin layer (hard coat layer) 3 was 5B.
・ Coating liquid for hard coat layer Hitachi Chemical 7988 (tack-free UV curable resin with UV polymerization initiator: solid content 35%) ... 100 parts by weight Mitsui Chemicals Takenate D-110N (isocyanate compound) 1 part by weight

Subsequently, in the same manner as in Example 1, printing was performed with a predetermined decorative printing layer coating solution, and an adhesive layer coating solution (K539HP adhesive varnish manufactured by Toyo Ink) was applied as a bonding layer 5 by dry gravure coating to a thickness of 1 μm. Thus, a simultaneously molded decorative transfer film 100 according to Comparative Example 2 was obtained. The simultaneously decorated decorative transfer film 100 was fixed to an injection mold, and the mold was clamped to injection-mold a PC / ABS resin. After cooling, the mold for injection molding is opened, the base film 1 of the simultaneous decorative decorative transfer film 100 is peeled off from the molded product together with the release layer 2, and the integrated light quantity is 1000 mJ / The molded product 200 was obtained by irradiating with cm ² ultraviolet rays.

<Evaluation and method>
About the in-mold molding transfer film (molded simultaneous decorating transfer film) produced in Examples 1, 2, 3 and Comparative Examples 1 and 2, to-be-molded bodies (notebook PC housings) by the respective in-mold molding transfer films The transferability (formability) to was visually evaluated. More specifically, the presence or absence of cracks during the transfer of each in-mold transfer film was visually evaluated. The case where there was no abnormality in the appearance (a level where there was no problem in practical use) was marked as ◯, and the case where there was a problem (practical problem) was marked as x. Moreover, about the blocking, the presence or absence of blocking was investigated for each transfer film for in-mold shaping | molding on the test conditions of room temperature, 100 kg / m < ² > load, and 24 hours. The case where there was no blocking was indicated as ◯, and the case where there was blocking was indicated as ×. The results are shown in Table 1.

As shown in Table 1, the transfer films of Examples 1, 2, and 3 do not cause cracks during transfer and do not cause blocking.
In each of the above-described examples and comparative examples, the transfer film not provided with the primer layer 6 (that is, the molded simultaneous decorating transfer film 100) has been described, but the present invention is not limited to this. Even with the transfer film provided with the primer layer 6 (that is, the simultaneous molding decorative transfer film 101), the same effect as that of the simultaneous molding decorative transfer film 100 could be obtained.

DESCRIPTION OF SYMBOLS 1 Base film 2 Release layer 3 Radiation curable resin layer 4 Decorating printing layer 5 Adhesive layer 6 Primer layer 7 Molding resin 100 Molding simultaneous decorating transfer film 101 Molding simultaneous decorating transfer film 200 Molded product

Claims (7)

In the transfer film with a radiation curable resin layer that can be peeled off on the base film,
A release layer is provided between the base film and the radiation curable resin layer,
The radiation curable resin layer is obtained by heating and curing a coating film coated with a coating solution containing a radiation curable resin and a thermosetting agent, and a pencil hardness test was performed under the measurement conditions of JIS-K5600 method. Ri hardness der less than B when,
The transfer film , wherein the release layer includes a cured product formed from an acrylic polyol, at least one of a long-chain alkyl group-containing acrylic and a silicone-modified acrylic resin, and a polyisocyanate .   The transfer film according to claim 1, wherein the radiation curable resin layer has a hardness of 4B or more when a pencil hardness test is performed under measurement conditions of JIS-K5600 method.   The transfer film according to claim 1, wherein the thermosetting agent is an isocyanate compound.   The transfer film according to any one of claims 1 to 3, further comprising a decorative printing layer on the radiation curable resin layer.   The transfer film according to claim 4, further comprising a primer layer formed between the radiation curable resin layer and the decorative printing layer. Supplying the transfer film according to any one of claims 1 to 5 between a pair of injection molds;
The cavity formed by the injection mold supplied with the transfer film is filled with a heat-pressed molding resin to mold the molded product, and at the same time, the radiation-curable resin layer of the transfer film is formed on the molded product. Bonding process;
Removing the molded product from the injection mold and peeling the base film of the transfer film;
And a step of curing the radiation curable resin layer by irradiating the radiation curable resin layer on the surface of the molded product. Forming a release layer on the base film;
Forming a radiation curable resin layer on the release layer in a releasable manner,
In the step of forming the release layer, the release layer including a cured product formed from an acrylic polyol, at least one of a long-chain alkyl group-containing acrylic and a silicone-modified acrylic resin, and a polyisocyanate is formed,
In the step of forming the radiation curable resin layer, a coating film to which a coating solution containing a radiation curable resin and a thermosetting agent is applied is cured by heating in a temperature range of 120 ° C. to 180 ° C. A method for producing a transfer film, wherein the radiation curable resin layer is formed so that the hardness when a pencil hardness test is carried out under measurement conditions is B or less.

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