JP2011213022A - Method for manufacturing three-dimensional molded decorative film, decorative molded product, and method for manufacturing decorative molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a decorative film high in adhesiveness to injection molding resin.SOLUTION: This method for manufacturing a three-dimensional molded decorative film includes a process for laminating an adhesive layer on a base material using an adhesive whose value of "the softening temperature of the adhesive- a die temperature in injection molding" is 25-65°C and whose value of "a resin temperature in injection molding- the softening temperature of the adhesive" is 90-190°C.

Description

  The present invention relates to a method of manufacturing a three-dimensional molded decorative film for simultaneous injection molding used in a decorative molded product by injection molding, a decorative molded product using the three-dimensional molded decorative film, and a method of manufacturing the same. .

Conventionally, an injection molding simultaneous decorating method is used for decorating a resin molded body having a complicated surface shape such as a three-dimensional curved surface. The injection molding simultaneous decorating method is to integrate the decorative film inserted in the mold during injection molding with the molten injection resin injected into the cavity and decorate the surface of the resin molded body Generally, it is roughly classified into an injection molding simultaneous laminate decoration method and an injection molding simultaneous transfer decoration method depending on the difference in the configuration of the decorative film integrated with the resin molded body.
In the injection molding simultaneous lamination decoration method, the substrate side of the decorative film for injection molding simultaneous lamination decoration is directed into the mold and heated from the adhesive layer side by a hot platen, and the decoration film is mold After pre-molding along the inner shape, closely contacting the inner surface of the mold and clamping, the molten molding resin is injected into the cavity to integrate the decorative film and the molding resin, then decorating By cooling the molded product and taking it out of the mold, a decorative molded product decorated with a laminate is obtained.
On the other hand, in the injection molding simultaneous transfer decoration method, the transfer layer side of the decoration film for injection molding simultaneous transfer decoration is directed into the mold and heated from the transfer layer side by a hot platen, and the decoration film is After pre-molding along the shape of the mold and closely contacting the inner surface of the mold, the mold is injected into the cavity to integrate the decorative film and the molding resin. The decorative molded product is cooled and taken out from the mold, and the decorative molded product to which the transfer layer is transferred is obtained by peeling the base material of the decorative film.

When comparing the injection molding simultaneous lamination decoration method and the injection molding simultaneous transfer decoration method, the former injection molding simultaneous lamination decoration method has a simple layer structure of the three-dimensional decorative film and is easy to manufacture. Although it has the advantage that there exists, since the base material which comprises this decorative film is taken in in a decorative resin molded product, there exists a problem that the kind of this base material is restrict | limited.
On the other hand, in the latter transfer decoration method, since the base material constituting the three-dimensional decorative film is peeled off from the decorative resin molded product, there is an advantage that the type of the base material is not particularly limited. However, there is a problem that the layer configuration of the three-dimensional molded decorative film is complicated, and the manufacturing cost of the resulting decorative resin molded product is increased.
Thus, the injection molding simultaneous laminate decoration method and the injection molding simultaneous transfer decoration method have advantages and disadvantages, respectively, and are usually used properly according to the use of the obtained decorative resin molded product.

  By the way, as a transfer sheet used in the injection molding simultaneous transfer decorating method, for example, on the releasable surface of the releasable sheet, it is solid at room temperature in an uncured state and is UV curable which is a thermoplastic resin. Alternatively, a transfer sheet characterized by having an uncured resin which is an electron beam curable resin has been proposed (see Patent Document 1). Since the uncured resin has thermoplasticity and solvent solubility, the transfer sheet is non-flowable and non-adhesive when apparently painted or dried or touched by hand. A pattern layer can be formed on the uncured resin layer. However, when cured in the form of a sheet, sufficient moldability cannot be obtained. Therefore, after being transferred to a transfer medium by an injection simultaneous molding method, the film is cured by irradiation with ultraviolet rays or electron beams. However, in this method, since the uncured resin layer flows during the simultaneous injection molding, the sheet may not be transferred well to the molded body, and it is very difficult to cure uniformly. There was a problem.

In addition, a transfer sheet provided with a protective layer made of an ionizing radiation curable resin, which is a thermoplastic solid in an uncured state, on a substrate with good moldability is placed in an injection mold and transferred. After the sheet is vacuum-formed or vacuum / pressure-air-formed, the resin is cured by irradiating with ionizing radiation to form a protective layer, and the mold is closed and the molten resin is injected to perform injection molding. And a method for producing a molded product characterized in that a protective layer having a high hardness is formed (see Patent Document 2).
Also in this method, after vacuum forming or vacuum / pressure forming, the protective layer is formed by irradiating with ionizing radiation to form a protective layer, so the same problem as the decorative film disclosed in Patent Document 1 There is a point. That is, when cured in the state of a sheet, sufficient moldability can not be obtained, and after vacuum forming or vacuum / pressure forming, curing is performed by irradiating ultraviolet rays or electron beams. Since the uncured resin layer flows during the pressure forming, there are cases where the transfer to the molded body is not performed well.

In order to solve such a problem, Patent Document 3 discloses that a surface protective layer made of a cured product of an acrylate ionizing radiation curable resin is laminated on the surface side of a transparent substrate sheet, and the back surface of the substrate sheet. A decorative sheet is disclosed in which a decorative layer and an adhesive layer mainly composed of a vinyl chloride-vinyl acetate copolymer are laminated in this order, and the decorative sheet is bonded to the decorative sheet. After inserting the agent layer in the direction in contact with the injection resin between both male and female molds, both molds were clamped, and the resin in a fluid state was injected into the cavity formed by both molds to solidify the resin. Subsequently, a method of simultaneous decorating injection molding is disclosed in which the mold is opened to obtain a decorated molded product in which the decorative sheet is laminated and integrated with a resin molded product.
In this case, a decorative molded product is produced by the injection molding simultaneous decorating method using a decorative sheet laminated with a surface protective layer made of a cured product of an ionizing radiation curable resin. The problem which arises when producing a decorative molded product using the transfer sheet which has uncured resin of ionizing radiation curable resin as described in 1 and patent document 2 does not generate | occur | produce.

JP-A-63-132095 JP-A-6-155518 Japanese Patent Laid-Open No. 2002-2225070

  The technique described in Patent Document 3 is a decorative resin even when the protective layer transferred as the outermost layer of the decorative resin molded product contains an ionizing radiation curable resin and the protective layer is crosslinked and cured. Although it is a technique superior to the techniques described in Patent Documents 1 and 2 such as being well transferred to a molded article, the base sheet used for the transfer sheet is taken into the decorative resin molded article, The type of the base sheet is limited, and the feature of the transfer decoration method that the type of the base sheet is not particularly limited is impaired.

In the injection molding simultaneous laminate decoration method and the injection molding simultaneous transfer decoration method, the present inventors have obtained the adhesion between the injection molding resin and the decorative film in order to obtain a decorative resin molded product of good quality. Focusing on the fact that it must be sufficiently high, we have conducted extensive research on the adhesive layers that make up the three-dimensional decorative film.
When an ABS resin (resin temperature during injection molding: about 230 ° C.) or a polycarbonate resin / ABS resin alloy (resin temperature during injection molding: about 260 ° C.) is used as the injection resin, the mold temperature (injection) Immediately after molding, when the molded product is taken out, the temperature is almost the same as that of the molded product.) In this case, the adhesive constituting the adhesive layer has a softening temperature around 100 ° C., For example, it has been found that if a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer or an acrylic resin having a low softening temperature is used, the adhesion between the injection resin and the decorative film is improved. However, when a polycarbonate resin having a high resin temperature at the time of injection molding, for example, about 310 ° C., is used as the injection molding resin, if the adhesive constituting the adhesive layer has a softening point near 100 ° C., the injection molding is performed. It was found that the adhesion between the resin and the decorative film was insufficient.

  Under such circumstances, the present invention is a decorative film used in an injection molding simultaneous decoration method for imparting design properties to a decorative resin molded article, and the adhesion between the injection molded resin and the decorative film It is an object to provide a method for producing a decorative film having good properties, a decorative molded product using a decorative film obtained by the production method, and a method for producing the decorative molded product.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have specified the value of “softening temperature of the adhesive-mold temperature at the time of injection molding” as the adhesive constituting the adhesive layer. It was found that the above-mentioned problem can be solved by using an adhesive having a value of “resin temperature during injection molding—softening temperature of the adhesive” in a specific range. The present invention has been completed based on such findings.

  That is, the present invention provides, on the base material, the value of “softening temperature of the adhesive—mold temperature at the time of injection molding” as an adhesive is 25 to 65 ° C. and “resin temperature at the time of injection molding— The present invention provides a method for producing a three-dimensional decorative film including a step of laminating an adhesive layer using an adhesive having a value of “softening temperature of adhesive” of 90 to 190 ° C.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a decorative film with high adhesiveness with injection molding resin can be provided.

It is a schematic diagram which shows the cross section of an example of the three-dimensional shaping | molding decorative film (laminated decorative film) obtained by the manufacturing method of this invention. It is a schematic diagram which shows the cross section of an example of the three-dimensional shaping | molding decoration film (decorative film for transcription | transfer) obtained by the manufacturing method of this invention. It is a schematic diagram which shows the cross section of an example of the decorative molded product of this invention. It is a schematic diagram which shows the cross section of an example from which the decorative molded product of this invention differs.

  In the method for producing a three-dimensional decorative film of the present invention, the value of “softening temperature of the adhesive-mold temperature at the time of injection molding” is 25 to 65 ° C. as an adhesive on the substrate, and “ It includes a step of laminating an adhesive layer using an adhesive having a value of “resin temperature at the time of injection molding−softening temperature of the adhesive” of 90 to 190 ° C.

[Method for producing three-dimensional decorative film]
The manufacturing method of the three-dimensional shaped decorative film of the present invention includes two modes: (1) a method for manufacturing a decorative film for lamination, and (2) a method for manufacturing a decorative film for transfer.
Here, “decorative film for laminate” refers to a three-dimensional molded decorative film having a base material and an adhesive layer, and “decorative film for transfer” refers to a release layer and a protective layer on the base material. It refers to a three-dimensional decorative film formed by laminating a layer and an adhesive layer in this order.

(Method for producing decorative film for laminating)
The method for producing a decorative film for laminating according to the present invention is a method for producing a three-dimensional decorative film for injection-molding simultaneous lamination. In an embodiment having a decorative layer, the following steps [1] and [2] Is included.
[1] A step of laminating a decorative layer on a substrate, and [2] On the decorative layer, as an adhesive, a value of “softening temperature of the adhesive—mold temperature during injection molding” is 25 to 65. A step of laminating an adhesive layer using an adhesive having a temperature of 90 ° C. to 190 ° C. and a value of “resin temperature during injection molding−softening temperature of the adhesive”.
Here, the decorative layer is a layer provided as desired, and it is particularly preferable to provide a picture layer on the base material side and a concealing layer on the adhesive layer side.
As a method for laminating the decorative layer and the adhesive layer laminated on the substrate, known printing or coating means such as gravure printing or roll coating is used.
When the decorative layer is a combination of a pattern layer and a concealing layer as described above, for example, one layer may be stacked and then dried, and then the next layer may be stacked.
Moreover, in the aspect which does not have a decoration layer, the manufacturing method of the decorative film for laminates of this invention consists of the process of laminating | stacking an adhesive bond layer directly on a base material normally.

(Method for producing a decorative film for transfer)
The method for producing a decorative film for transfer of the present invention is a method for producing a three-dimensional decorative film for simultaneous injection molding, and in the embodiment having a decorative layer, the following steps [1] to [5] Is included.
[1] A step of laminating a release layer on a substrate,
[2] A step of laminating an ionizing radiation curable resin composition layer containing a polymerizable (meth) acrylate oligomer on the release layer,
[3] A step of irradiating the ionizing radiation curable resin composition layer with ionizing radiation to crosslink and cure the ionizing radiation curable resin composition layer to form a protective layer;
[4] A step of laminating a decorative layer on the protective layer, and [5] On the decorative layer, as an adhesive, a value of “softening temperature of the adhesive—mold temperature during injection molding” is 25 to 25 A step of laminating an adhesive layer using an adhesive having a value of 65 ° C. and “resin temperature during injection molding—softening temperature of the adhesive” of 90 to 190 ° C.
And it is preferable to include the process of laminating | stacking a primer layer on a protective layer further between the process of forming a protective layer, and the process of laminating | stacking a decoration layer. Note that, in the aspect having no decoration layer, the step [4] is omitted.
As a method for laminating a release layer, a protective layer, a primer layer, a decoration layer, and an adhesive layer that are laminated on a substrate, known printing or coating means such as gravure printing or roll coating is used. .
When the decorative layer is a combination of a pattern layer and a concealing layer as described above, for example, one layer may be stacked and then dried, and then the next layer may be stacked.

In the step of forming the protective layer in the present invention, the ionizing radiation curable resin composition layer is formed by irradiating the ionizing radiation curable resin composition layer laminated on the release layer with ionizing radiation such as an electron beam and ultraviolet rays. Is cured by cross-linking. Here, when an electron beam is used as the ionizing radiation, the accelerating voltage can be appropriately selected according to the resin used and the thickness of the layer. It is preferable to cure.
In electron beam irradiation, the transmission capability increases as the acceleration voltage increases. Therefore, when using a base material that deteriorates due to the electron beam as the base material, the transmission depth of the electron beam and the thickness of the resin layer are substantially equal. By selecting the accelerating voltage so as to be equal to each other, it is possible to suppress the irradiation of the electron beam to the base material, and to minimize the deterioration of the base material due to the excessive electron beam.
The irradiation dose is preferably such that the crosslinking density of the resin layer is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 60 kGy (1 to 6 Mrad).
Further, the electron beam source is not particularly limited. For example, various electron beam accelerators such as a cockroft Walton type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type. Can be used.

  When ultraviolet rays are used as the ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. There is no restriction | limiting in particular as an ultraviolet-ray source, For example, a high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a carbon arc lamp, etc. are used.

Hereinafter, the three-dimensional decorative film obtained by the production method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a cross section of a preferred example of a three-dimensional molded decorative film (decorative film for laminating) obtained by the production method of the present invention.
A three-dimensional molded decorative film (laminar decorative film) 10 shown in FIG. 1 is a three-dimensional injection molding simultaneous laminate in which a decorative layer 15 and an adhesive layer 16 are laminated in this order on a substrate 11. It is a molded decorative film.
On the other hand, a three-dimensional molded decorative film (transfer decorative film) 20 shown in FIG. 2 has a release layer 12, a protective layer 13, a primer layer 14 provided as desired, a decorative layer 15, and a substrate 11. It is a three-dimensional molded decorative film for simultaneous injection molding formed by laminating an adhesive layer 16 in this order.

[Base material]
Although it is important that the base material 11 used when manufacturing the decorative film for lamination using the manufacturing method of the present invention is colorless and transparent, the base material is incorporated into the decorative molded product. Since the base material 11 used for the decorative film for use is peeled and removed from the obtained decorative molded product, it is not necessary to be colorless and transparent.
The substrate 11 in the decorative film for laminate and the decorative film for transfer is selected in consideration of suitability for vacuum forming, and a resin film made of a thermoplastic resin is typically used. Examples of the thermoplastic resin include polyester resin; acrylic resin; polyolefin resin such as polypropylene and polyethylene; polycarbonate resin; acrylonitrile-butadiene-styrene resin (ABS resin); vinyl chloride resin.
The thickness of the resin film used for this invention is 10-200 micrometers normally, 10-150 micrometers is preferable and 20-125 micrometers is more preferable.
Moreover, the base material 11 can be used as a single layer film of these resins, or a multilayer film made of the same or different resins.

In the present invention, it is preferable to use a polyester film as the substrate 11 in terms of heat resistance, dimensional stability, moldability, and versatility. In addition, an acrylic resin film is also preferably used as the base material of the decorative film for lamination.
The polyester resin which comprises a polyester film means the polymer containing the ester group obtained by polycondensation from polyhydric carboxylic acid and polyhydric alcohol. Examples of the polyvalent carboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, decanedicarboxylic acid, azelaic acid, dodecanedicarboxylic acid, and cyclohexanedicarboxylic acid. Polyhydric alcohols include ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentylglycol, 1,4-cyclohexanedimethanol, decanediol, 2-ethyl-butyl-1-propanediol, and bisphenol. A etc. are mentioned. Further, the polyester resin used in the present invention may be a copolymer of three or more kinds of polyvalent carboxylic acids and polyhydric alcohols, and is a copolymer with monomers and polymers such as diethylene glycol, triethylene glycol, and polyethylene glycol. There may be.

Preferred examples of the polyester resin used for the polyester film include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN). Polyethylene terephthalate (PET) has heat resistance and dimensional stability. This is particularly preferable.
The polyester resin may be a homopolymer, a copolymer, or a copolymer obtained by copolymerizing a third component. For example, a polyester resin having polyethylene terephthalate, which is generally excellent in heat resistance and dimensional stability as a main component (usually 90 mol% or more, preferably 95 mol% or more), and polybutylene terephthalate, which is generally excellent in moldability, as a main component (usually 90 mol%). Mol% or more, preferably 95 mol% or more). The blending ratio may be appropriately selected depending on the dynamic elastic modulus of the film to be obtained, and is usually 70/30 to 95/5 in mass ratio, and preferably in the range of 75/25 to 85/15. Since the polyester film blended in this way is excellent in heat resistance, dimensional stability, and moldability, it can be suitably used as the base material of the present invention.

  The polyester film preferably contains fine particles for the purpose of improving workability. Fine particles include inorganic particles such as calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, lithium phosphate, magnesium phosphate, calcium phosphate, aluminum oxide, silicon oxide and kaolin, organic particles made of acrylic resin, and internal precipitation particles. And so on. The average particle size of the fine particles is preferably 0.01 to 5.0 μm, more preferably 0.05 to 3.0 μm. Moreover, 0.01-5.0 mass% is preferable and, as for content of the microparticles | fine-particles in a polyester-type resin, 0.1-1.0 mass% is more preferable. Moreover, various stabilizers, lubricants, antioxidants, antistatic agents, antifoaming agents, fluorescent whitening agents, and the like can be blended as necessary.

  The polyester film used for this invention is manufactured as follows, for example. First, the above polyester-based resin and other raw materials are supplied to a known melt extrusion apparatus such as an extruder, and heated to a temperature equal to or higher than the melting point of the polyester-based resin to be melted. Next, while extruding the molten polymer, it is rapidly cooled and solidified in the form of a rotating cooling drum to a temperature not higher than the glass transition temperature to obtain a substantially amorphous unoriented sheet. This sheet is obtained by stretching in a biaxial direction to form a film and heat-setting. In this case, the stretching method may be sequential biaxial stretching or simultaneous biaxial stretching. Moreover, you may extend | stretch longitudinally and / or a horizontal direction again before or after performing heat setting as needed. In the present invention, in order to obtain sufficient dimensional stability, the draw ratio is preferably 7 times or less, more preferably 5 times or less, and further preferably 3 times or less, as an area ratio. If it is within this range, when the obtained polyester film is used for a three-dimensional molded decorative film, the three-dimensional molded decorative film does not shrink again in the temperature range when the injection resin is injected. Necessary film strength can be obtained. In addition, a polyester film may be manufactured as described above, or a commercially available one may be used.

In the case of using a plastic film as the base material, in the decorative film for laminate, physical or chemical methods such as an oxidation method and a concavo-convex method are used for the purpose of improving the adhesion with a decorative layer or an adhesive layer described later. Surface treatment can be applied. This is particularly effective when a polyester film is used as the substrate.
On the other hand, in the decorative film for transfer, in an embodiment having a release layer, the surface treatment is performed as desired to improve the adhesion with the release layer, and the interlayer adhesion strength between the transfer layer and the release layer. Compared to the above, it is possible to easily release the base material by providing relatively strong adhesion.
Examples of the oxidation method include corona discharge treatment, chromium oxidation treatment, flame treatment, hot air treatment, ozone / ultraviolet treatment method, and examples of the unevenness method include a sand blast method and a solvent treatment method. These surface treatments are appropriately selected depending on the type of substrate, but generally, a corona discharge treatment method is preferably used from the viewpoints of effects and operability.
The base material may be subjected to a treatment such as forming an easy-adhesion layer for the purpose of enhancing interlayer adhesion between the base material and the layer provided thereon. In addition, when using a commercially available polyester film as a plastic film, what was surface-treated as mentioned above beforehand and what was provided with the easily adhesive layer can also be used for this commercial item.

[Release layer]
The release layer 12 in the decorative film for transfer easily peels the transfer layer 17 composed of the protective layer 13, the primer layer 14, the decorative layer 15, and the adhesive layer 16, if desired, from the base sheet 11. It is provided to perform. As shown in FIG. 2, the release layer 12 may be a solid release layer covering the entire surface (entirely solid), or may be provided in a part. In general, a solid release layer is preferable in consideration of peelability.

The release layer is made of fluorine resin, acrylic resin (for example, acrylic-melamine resin), polyester resin, polyolefin resin, polystyrene resin, polyurethane resin, cellulose resin, vinyl chloride-acetic acid. Vinyl-based copolymer resins, thermoplastic resins such as nitrified cotton, copolymers of monomers that form the thermoplastic resins, or those modified with (meth) acrylic acid or urethane, alone or in plural It can form using the resin composition which mixed. Among these, acrylic resins, polyester resins, polyolefin resins, polystyrene resins, copolymers of monomers that form these resins, and those obtained by urethane modification thereof are more preferable. More specifically, acrylic-melamine Resin, acrylic-melamine resin-containing composition, polyester resin and ethylene / acrylic acid copolymer modified with urethane, acrylic resin / styrene / acrylic copolymer And a resin composition mixed with the above emulsion. Of these, the release layer 12 is particularly preferably composed of an acrylic-melamine resin alone or a composition containing 50% by mass or more of the acrylic-melamine resin.
The thickness of the release layer 12 is usually about 0.01 to 5 μm, and preferably 0.05 to 3 μm.

[Protective layer]
The protective layer 13 in the decorative film for transfer is preferably made of a cured product of an ionizing radiation curable resin composition containing a polymerizable (meth) acrylate oligomer. The polymerizable (meth) acrylate oligomer preferably has a weight average molecular weight Mw of 1000 to 40000. If the weight average molecular weight Mw of the polymerizable (meth) acrylate oligomer is 1000 or more, the peel strength after transfer is not too high, and if the weight average molecular weight Mw is 40000 or less, the peel strength is not too low. . From these viewpoints, the weight average molecular weight Mw is more preferably 1500 to 25000, and particularly preferably 2000 to 20000.

In the present invention, the polymerizable (meth) acrylate oligomer used as the ionizing radiation curable resin in the ionizing radiation curable resin composition constituting the protective layer 13 includes a plurality of radically polymerizable unsaturated groups in the molecule. Functional (meth) acrylate oligomers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate are examples.
Here, the urethane (meth) acrylate oligomer can be obtained, for example, by esterifying a polyurethane oligomer obtained by the reaction of polyether polyol or polyester polyol and polyisocyanate with (meth) acrylic acid. The epoxy (meth) acrylate oligomer can be obtained, for example, by reacting (meth) acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol type epoxy resin or novolak type epoxy resin and esterifying it. Further, a carboxyl-modified epoxy (meth) acrylate oligomer obtained by partially modifying this epoxy (meth) acrylate oligomer with a dibasic carboxylic acid anhydride can also be used. Examples of polyester (meth) acrylate oligomers include esterification of hydroxyl groups of polyester oligomers having hydroxyl groups at both ends obtained by condensation of polycarboxylic acid and polyhydric alcohol with (meth) acrylic acid, It can be obtained by esterifying the terminal hydroxyl group of an oligomer obtained by adding an alkylene oxide to a carboxylic acid with (meth) acrylic acid. The polyether (meth) acrylate oligomer can be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid.

Furthermore, as the polymerizable (meth) acrylate oligomer, there are other polybutadiene (meth) acrylate oligomers having a high hydrophobicity having a (meth) acrylate group in the side chain of the polybutadiene oligomer, and silicone having a polysiloxane bond in the main chain (methamethacrylate). ) Acrylate oligomers, aminoplast resin (meth) acrylate oligomers obtained by modifying aminoplast resins having many reactive groups in small molecules.
One of the above polymerizable (meth) acrylate oligomers may be used alone, or two or more thereof may be used in combination.
Of the above polymerizable (meth) acrylate oligomers, polyfunctional urethane (meth) acrylate oligomers are preferable, and bifunctional urethane (meth) acrylate oligomers are particularly preferable from the viewpoint of moldability.

  In the present invention, together with the polymerizable (meth) acrylate oligomer, a monofunctional (meth) acrylate can be appropriately used in combination as long as the object of the present invention is not impaired for the purpose of reducing the viscosity. Examples of monofunctional (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl ( Examples include meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, and isobornyl (meth) acrylate. These monofunctional (meth) acrylates may be used alone or in combination of two or more.

Furthermore, in the present invention, for the purpose of imparting more scratch resistance and the like to the protective layer, a polyfunctional (meth) acrylate monomer is not impaired along with the polymerizable (meth) acrylate oligomer. It can be used together as appropriate within the range.
Examples of the polyfunctional (meth) acrylate monomer include diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, and di Examples include pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. These polyfunctional (meth) acrylate monomers may be used individually by 1 type, and may be used in combination of 2 or more type.

When an ultraviolet curable resin is used as the ionizing radiation curable resin, it is desirable to add about 0.1 to 5 parts by mass of the photopolymerization initiator with respect to 100 parts by mass of the resin. The initiator for photopolymerization can be appropriately selected from conventionally used initiators and is not particularly limited. For example, for a polymerizable (meth) acrylate oligomer having a radically polymerizable unsaturated group in the molecule. Benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2 -Phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1 ON, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiary butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, etc. Can be mentioned.
Moreover, as a photosensitizer, p-dimethylbenzoic acid ester, tertiary amines, a thiol type sensitizer, etc. can be used, for example.

  In the present invention, it is preferable to use an electron beam curable resin as the ionizing radiation curable resin. This is because the electron beam curable resin can be made solvent-free, is more preferable from the viewpoint of environment and health, and does not require a photopolymerization initiator, and can provide stable curing characteristics.

Further, the protective layer 13 may contain a filler as desired. By including a filler, tackiness can be further improved and printability can be imparted.
As the type of filler, for example, particles made of inorganic substances such as silica, alumina, calcium carbonate, aluminosilicate, barium sulfate, organic polymers such as acrylic resin, polyethylene, urethane resin, polycarbonate, polyamide (nylon), etc. are used. . Of these, silica is preferable because it has an effect of reducing tackiness, is easy to handle, and is inexpensive.
The average particle diameter of the filler is preferably 0.5 to 20 μm, more preferably 0.5 to 10 μm, and the addition amount is 0.1 to 10 parts by mass with respect to 100 parts by mass of the resin forming the protective layer. The range is preferable, and the range of 0.5 to 5 parts by mass is more preferable. The shape of the particles is a polyhedron, a sphere, a scale shape, or the like.

  The thickness of the protective layer 13 is usually about 1 to 50 μm, and preferably in the range of 5 to 15 μm. This protective layer 13 may be subjected to corona discharge treatment or plasma discharge treatment for the purpose of improving the adhesion with the primer layer described later.

  The protective layer 13 has various functions by adding various additives, for example, a so-called hard coating function, anti-fogging coating function, anti-fouling coating function, anti-glare coating function, reflection, having high hardness and scratch resistance. It is also possible to impart a prevention coating function, an ultraviolet shielding coating function, an infrared shielding coating function, and the like.

[Primer layer]
In the decorative film for transfer produced according to the present invention, a primer layer 14 is preferably further laminated between the protective layer 13 and a decorative layer 15 described later. This is because the adhesion between the protective layer 13 and the decorative layer 15 can be further improved by laminating the primer layer 14. The primer layer 14 is preferably a transparent or translucent layer, such as polyurethane resin, polyester resin, acrylic resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, cellulose resin, chlorinated resin. One kind of resin such as polyethylene and chlorinated polypropylene, or a mixture of two or more kinds is used, and those using a polyurethane two-component curable resin are particularly preferable.

As the polyurethane-based two-component curable resin, for example, a curing agent is added immediately before use to a polymer polyol such as vinyl chloride-vinyl acetate copolymer, polyester, urethane, acrylic, or a mixture thereof. Used. As the curing agent, polyisocyanate is preferable, for example, aromatic isocyanate such as 2,4-tolylene diisocyanate, xylylene diisocyanate, naphthalene diisocyanate, 4,4'-diphenylmethane diisocyanate; 1,6-hexamethylene diisocyanate, 2 , 2,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate and the like, or adducts of the above-mentioned various isocyanates. Alternatively, a multimer, for example, an adduct of tolylene diisocyanate, a tolylene diisocyanate trimer, or the like can be used.
The polymer polyol is preferably a polyester polyol, such as poly (ethylene adipate), poly (butylene adipate), poly (neopentyl adipate), poly (hexamethylene adipate), poly (butylene azelate), poly (butylene seba). Kate), polycaprolactone, etc. are used.
A coating solution obtained by dissolving the resin in a solvent is applied and dried by a known method to form a primer layer. About the thickness of a primer layer, it is about 0.5-20 micrometers normally, Preferably, it is the range of 1-5 micrometers.

[Decoration layer]
The decorative layer 15 in the decorative film for laminate and the decorative film for transfer produced according to the present invention is usually composed of a picture layer and / or a concealing layer. Here, the pattern layer is a layer provided for expressing a pattern such as a pattern or characters, and the concealing layer is generally a solid layer and is provided for concealing coloring such as injection resin. Is a layer. In the concealing layer, a decorative layer may be formed alone in addition to the case of being provided inside the pattern layer in order to enhance the pattern of the pattern layer. Moreover, the said decoration layer may be transparent and may be colored.
Here, the pattern layer is a layer provided for expressing a pattern such as a pattern or characters. Although the pattern of the pattern layer is arbitrary, for example, a pattern composed of wood grain, stone grain, cloth grain, sand grain, geometric pattern, character, and the like can be mentioned.
The decorative layer 15 is usually a decorative film for laminating on the substrate 11 by a known printing method such as gravure printing, offset printing, silk screen printing, transfer printing from a transfer sheet, sublimation transfer printing, ink jet printing and the like. By forming, it forms between the base material 11 and the adhesive bond layer 16, as shown in FIG. On the other hand, in the decorative film for transfer, the protective layer 13 and the adhesive layer 16 are formed on the protective layer 13 or the primer layer 14 by a known printing method similar to the above, as shown in FIG. Formed between. The thickness of the decorative layer 15 is preferably 3 to 40 μm and more preferably 10 to 30 μm from the viewpoint of design.

  As the binder resin of the printing ink used for forming the decorative layer 15, polyester resins, polyurethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, and the like are preferable. The main component is preferably an acrylic resin alone or a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin. Among these, when an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin or another acrylic resin is mixed, the printability and moldability are improved, which is preferable. Here, the acrylic resin includes polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer. Examples include acrylic resins such as polymers (where (meth) acrylate refers to acrylate or methacrylate), modified acrylic resins such as fluorine, and these can be used as one or a mixture of two or more. In addition, (meth) acrylic acid alkyl esters such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, and 2-hydroxyethyl ( Acrylic polyol obtained by copolymerizing (meth) acrylate ester having a hydroxyl group in the molecule such as (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate Can also be used. As the vinyl chloride-vinyl acetate copolymer resin, those having a vinyl acetate content of about 5 to 20% by mass and an average degree of polymerization of about 350 to 900 are usually used. If necessary, the vinyl chloride-vinyl acetate copolymer resin may be further copolymerized with a carboxylic acid such as maleic acid or fumaric acid. The mixing ratio of the acrylic resin and the vinyl chloride-vinyl acetate copolymer resin is about acrylic resin / vinyl chloride-vinyl acetate copolymer resin = 1/9 to 9/1 (mass ratio). In addition, as a subcomponent resin, if necessary, other resins, for example, resins such as thermoplastic polyester resins, thermoplastic urethane resins, chlorinated polyethylene, chlorinated polypropylene, and other chlorinated polyolefin resins. May be mixed.

  Examples of the colorant used in the decorative layer 15 according to the present invention include aluminum, chromium, nickel, tin, titanium, iron phosphide, copper, gold, silver, brass and other metals, alloys, or scale-like foil powders of metal compounds. It consists of foil powder such as metallic pigment, mica-like iron oxide, titanium dioxide-coated mica, titanium dioxide-coated bismuth oxychloride, bismuth oxychloride, titanium dioxide-coated talc, fish scale foil, colored titanium dioxide-coated mica, and basic lead carbonate. Pearlescent pigments, fluorescent pigments such as strontium aluminate, calcium aluminate, barium aluminate, zinc sulfide, calcium sulfide, white inorganic pigments such as titanium dioxide, zinc white, antimony trioxide, zinc white, petal, Inorganic pigments such as vermilion, ultramarine, cobalt blue, titanium yellow, yellow lead, carbon black, isoindolinone Be low, Hansa Yellow A, quinacridone red, permanent red 4R, phthalocyanine blue, be mixed Indanthrene Blue RS, (including dyes) organic pigments such as aniline black one or more.

Such a decorative layer 15 is a layer provided for imparting design properties to a three-dimensional decorative film (for laminating and transferring), but for the purpose of improving the design properties, a metal thin film layer or the like is further provided. It may be formed. The metal thin film layer can be formed by using a metal such as aluminum, chromium, gold, silver, or copper by a method such as vacuum deposition or sputtering. This metal thin film layer may be provided on the entire surface or may be partially provided in a pattern.
In addition to the above components, the printing ink used for forming the decorative layer 15 is appropriately added with an anti-settling agent, a curing catalyst, an ultraviolet absorber, an antioxidant, a leveling agent, a thickener, an antifoaming agent, a lubricant, and the like. be able to. The printing ink is provided in a form in which the above components are usually dissolved or dispersed in a solvent. Any solvent can be used as long as it dissolves or disperses the binder resin, and an organic solvent and / or water can be used. Examples of the organic solvent include hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate, cellosolve acetate, and butyl cellosolve acetate, and alcohols.

[Adhesive layer]
In the production method of the present invention, the adhesive layer 16 is laminated with the base material 11 and the decorative layer 15 in the decorative film for lamination, and preferably with the protective layer 13 in the decorative film for transfer, if desired. The primer layer 14 and the decoration layer 15 are formed to be laminated on the injection molding resin with good adhesion. That is, as the adhesive layer 16, in the injection molding simultaneous decorating method, the injection molded resin and the three-dimensional molded decorative film are bonded so as to have good adhesion and do not peel off at the ends. It is important to obtain.
Therefore, in the present invention, as the adhesive constituting the adhesive layer, the value of “softening temperature of the adhesive—mold temperature at the time of injection molding” is 25 to 65 ° C., and “at the time of injection molding” An adhesive having a value of “resin temperature−softening temperature of the adhesive” of 90 to 190 ° C. is used. From the above viewpoint, the “resin temperature during injection molding—softening temperature of the adhesive” of the adhesive is preferably 130 to 190 ° C., and more preferably 170 to 185 ° C.
Moreover, the suitable range of the softening temperature of an adhesive agent exists by the resin temperature at the time of injection molding. Specifically, when the resin temperature during injection molding is 250 ° C. or higher, particularly when the resin temperature is 300 ° C. or higher, the softening temperature of the adhesive is preferably in the range of 110 to 150 ° C., and preferably 120 to 150 ° C. A range is further preferred.

  When the adhesive constituting the adhesive layer satisfies the above conditions, as the injection resin, for example, ABS resin (resin temperature at the time of injection molding: about 230 ° C.), polycarbonate resin / ABS resin alloy (resin at the time of injection molding) Temperature: about 260 ° C.) and polycarbonate resin (resin temperature during injection molding: about 310 ° C.), the respective mold temperatures are about 40-80 ° C., about 40-80 ° C., and about 70-100 ° C. In the decorative film for laminate, the base material 11 and the decorative layer 15 and the injection resin molded body are in close contact, while in the decorative film for transfer, the transfer layer 17 of the decorative film and the injection resin molded body are in close contact with each other. It is possible to obtain a decorative molded product formed by bonding with good properties.

Examples of the adhesive layer 16 include those composed of a heat-sensitive adhesive, a pressure adhesive, and the like. In the present invention, the adhesive layer 16 can be adhered to a decorative molded product by heating and pressing as necessary. A heat seal layer that develops is preferable. Examples of the resin used for the adhesive constituting the adhesive layer 16 include an acrylic resin, a vinyl chloride resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, a styrene-acryl copolymer resin, Of at least one resin selected from polyester-based resins, polyamide-based resins, and the like, an adhesive that satisfies the above conditions is appropriately selected and used. Apply one or two or more selected resins in a form that can be applied as a solution or an emulsion by means of a gravure printing method, a screen printing method or a reverse coating method using a gravure plate, and then dry. Can be formed.
The thickness of the adhesive layer 16 is preferably about 0.1 to 6 μm from the viewpoint that the three-dimensional decorative film can be efficiently transferred to the decorative molded product.

The adhesive layer 16 has an organic ultraviolet absorber such as benzophenone compound, benzotriazole compound, oxalic acid anilide compound, cyanoacrylate compound, salicylate compound, zinc, titanium, cerium, tin, iron, etc. It is possible to contain an additive of fine particles having an inorganic ultraviolet absorbing ability such as an oxide of the above. Further, as an additive, a coloring pigment, a white pigment, an extender pigment, a filler, an antistatic agent, an antioxidant, a fluorescent whitening agent, and the like can be appropriately contained as necessary.
The three-dimensional molded decorative film obtained by the production method of the present invention having such a configuration is particularly suitable for decorating a polycarbonate resin molded body.

[Method of manufacturing decorative molded product]
The manufacturing method of the decorative molded product of the present invention is (1) a method of manufacturing a decorative molded product using the decorative film for laminate manufactured as described above, and (2) manufactured as described above. There are two modes: a method for producing a decorative molded product using a decorative film for transfer.
(Method using decorative film for laminate)
The manufacturing method of the decorative molded product of the present invention using the decorative film for laminating includes the following steps (1) to (4).
(1) First, the step of heating the decorative film for laminating from the adhesive layer side with a hot platen, with the base material side of the decorative film for laminating directed into the mold,
(2) A step of pre-molding the heated decorative film for laminating so as to conform to the shape in the mold and closely contacting the inner surface of the mold, thereby clamping the mold;
(3) A step of injecting the injection resin into the mold, and (4) a step of taking out the decorative molded product from the mold after the injection resin has cooled.

(Method using decorative film for transfer)
On the other hand, the manufacturing method of the decoration molded product of this invention by the decoration film for transcription | transfer includes the following processes (1)-(5).
(1) First, the process of heating the decorative film for transfer from the adhesive layer side with a hot plate with the base material side of the decorative film for transfer facing into the mold,
(2) A step of pre-molding the heated decorative film for transfer so as to conform to the shape in the mold and closely contacting the inner surface of the mold to clamp the mold,
(3) A step of injecting the injection resin into the mold,
(4) A step of taking out the decorative molded product from the mold after the injection resin has cooled, and (5) a step of peeling the substrate and the release layer from the decorative molded product.

In both steps (1) and (2), the temperature for heating the three-dimensional decorative film (for laminating and transferring) is not less than the glass transition temperature of the substrate and less than the melting temperature (or melting point). It is preferable that it is the range of these. Usually, it is more preferable to carry out at a temperature near the glass transition temperature.
In addition, said glass transition temperature vicinity refers to the range of about glass transition temperature +/- 5 degreeC, and when using a suitable polyester film as a base material, it is generally about 70-130 degreeC.

In both steps (3), an injection resin, which will be described later, is melted and injected into a cavity to integrate the three-dimensional decorative film (for laminating and transferring) and the injection resin. When the injection resin is a thermoplastic resin, it is made into a fluid state by heating and melting, and when the injection resin is a thermosetting resin, the uncured liquid composition is injected in a fluid state at room temperature or appropriately heated. Cool and solidify. As a result, the three-dimensional decorative film is integrated with the formed resin molded body and attached to form a decorative molded product. The heating temperature of the injection resin depends on the injection resin, but is generally about 180 to 320 ° C.
When using the decorative film for lamination, the decorative molded product thus obtained is cooled and then taken out from the mold to obtain a decorative molded product. On the other hand, in the case of using a decorative film for transfer, after cooling and taking out from the mold, the substrate 11 and the release layer 12 are peeled off to remove the protective layer 13, the primer layer 14 provided as desired, and the decoration layer The decorative molded product to which the transfer layer 17 composed of 15 and the adhesive layer 16 is transferred is obtained.

[Production method: Injection resin]
The injection resin used for the decorative molded product is not particularly limited as long as it is a thermoplastic resin that can be injection molded or a thermosetting resin (including a two-component curable resin), and various resins are used. Can do. Examples of such thermoplastic resin materials include vinyl polymers such as polyvinyl chloride and polyvinylidene chloride; polystyrene, acrylonitrile-styrene copolymers, ABS resins (acrylonitrile-butadiene-styrene copolymer resins), and the like. Styrene resins; acrylic resins such as polymethyl (meth) acrylate, polyethyl (meth) acrylate, polyacrylonitrile; polyolefin resins such as polyethylene, polypropylene, polybutene, polyethylene terephthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, Examples thereof include polyester resins such as polybutylene terephthalate; polycarbonate resins. Examples of the thermosetting resin include a two-component reaction curable polyurethane resin and an epoxy resin. These resins may be used alone or in combination of two or more.
These resins include various additives as required, such as antioxidants, heat stabilizers, ultraviolet absorbers, light stabilizers, flame retardants, plasticizers, silica, alumina, calcium carbonate, aluminum hydroxide, etc. Inorganic powders, wood powders, fillers such as glass fibers, lubricants, mold release agents, antistatic agents, colorants and the like can be added. Note that as the injection resin, a resin colored by adding a colorant may be used as appropriate according to the application. As the colorant, a known colorant similar to that which can be used for the above-mentioned substrate can be used.
There is no restriction | limiting in particular about the thickness of the injection resin molding which comprises a decorative molded product, Although it selects according to the use of the said decorative molded product, Usually, 1-5 mm, Preferably it is 2-3 mm.

FIG. 3 is a schematic view showing a cross section of an example of the decorative molded product of the present invention. In the decorative molded product 30, the base material 11 and the decorative layer 15 are formed on the injection resin molded body 18, and the adhesive layer 16. It has a structure integrated and stacked via.
FIG. 4 is a schematic view showing a cross-section of a different example of the decorative molded product of the present invention. The decorative molded product 40 has a protective layer 13 and an optionally provided primer layer 14 on the injection resin molded body 18. The transfer layer 17 composed of the decorative layer 15 and the adhesive layer 16 is laminated and integrated through the adhesive layer 16.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
<Evaluation method>
(1) Weight average molecular weight of electron beam curable resin The value measured by GPC analysis and converted with standard polystyrene was used.
(2) Softening temperature of the adhesive constituting the adhesive layer The softening temperature Tm of the resin used as the adhesive was determined by a flow tester method.
(3) Adhesiveness between injection resin molded product and transfer layer in decorative molded product Immediately after molding the decorative molded product, the adhesiveness when the acrylic resin film of the base material was peeled in the direction of 180 degrees was as follows: The evaluation criteria were evaluated.
Criteria ◯: No film peeling Δ: Slight peeling at the end of the molded product x: Peeling over the entire molded product Note that ○ is acceptable and Δ and x are unacceptable.

Example 1
(1) Production of a three-dimensional decorative film (decorative film for laminating) Printing on the surface of a polymethyl methacrylate film having a thickness of 75 μm using an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin as a binder resin Ink (acrylic resin: 50% by mass, vinyl chloride-vinyl acetate copolymer resin: 50% by mass) is subjected to gravure printing at a coating amount of 3 g / m ² to form a woodgrain pattern layer. In addition, a concealing layer (with gravure printing) having a thickness of 3 μm was provided. Further, an acrylic resin [softening temperature Tm: 125 ° C.] is applied as an adhesive on the masking layer by gravure printing at a coating amount of 4 g / m ² to form an adhesive layer, and the three-dimensional structure shown in FIG. A molded decorative film (decorative film for laminating) was obtained.
(2) Production of decorative molded product The decorative film (a) obtained in (1) above is heated at a hot platen temperature of 150 ° C. and molded so as to conform to the shape inside the mold of injection molding. Adhered to the inner surface. The mold used was a 80 mm square size, 10 mm rising and 2R tray shape with a high deep drawing degree. On the other hand, an ABS resin [manufactured by Nippon A & L Co., Ltd., trade name “Crustic MTH-2”] was used as an injection resin, which was melted at 230 ° C. and then injected into the cavity. The product was taken out from the mold at a temperature of 80 ° C., and a decorative molded product 30 having the structure shown in FIG. In the present invention, deep drawing refers to a shape in which the area ratio before and after the decorative film is formed is 130% or more, and high deep drawing means that the area ratio is large. Say.
Table 1 shows the evaluation results of the adhesion between the injection resin molded product and the laminate layer in each condition in the injection molding simultaneous lamination decoration method and the obtained decorative molded product 30.

Examples 2-11
(1) Production of three-dimensional molded decorative film (decorative film for laminating) In Example 1 (1), Example 1 except that the adhesive having the type and softening temperature shown in Table 1 was used. In the same manner as (1), ten types of three-dimensional molded decorative films (decorative films for laminating) 2 having the configuration shown in FIG. 1 were produced.
(2) Production of decorative molded product The ten types of three-dimensional molded decorative films (decorative films for laminating) obtained in (1) above were used, and the types shown in Table 1 were used as the injection resin. Except for the above, the same operation as in Example 1 (2) was performed to produce 10 types of decorative molded articles having the configuration shown in FIG.

Comparative Examples 1-10
(1) Production of three-dimensional molded decorative film (decorative film for laminating) In Example 1 (1), instead of acrylic resin [softening temperature Tm: 125 ° C], the resins shown in Table 1 were used. Except for the above, ten types of three-dimensional decorative films (decorative films for laminating) were produced in the same manner as in Example 1 (1).
(2) Production of a decorative molded product Example 1 (2) under the conditions shown in Table 1 using the 10 types of decorative films obtained in (1) above and the type of injection resin shown in Table 1. The same operation as) was performed to produce 10 types of decorative molded products.
Table 1 shows the evaluation results of the adhesion between the injection resin molded product and the laminate layer in each of the obtained decorative molded products.

Reference example 1
(1) Production of three-dimensional molded decorative film (decorative film for laminating) In Example 1 (1), instead of acrylic resin [softening temperature Tm: 125 ° C.], acrylic resin [softening temperature Tm: 135 ° C. ] Was used in the same manner as in Example 1 (1) to produce a three-dimensional decorative film (decorative film for laminating).
(2) Production of decorative molded product In Example 1 (2), polycarbonate resin (hereinafter abbreviated as PC resin) instead of ABS resin as injection resin [trade name “Panlite L-, manufactured by Teijin Chemicals Ltd.” 1225Z "] except that it was injected into the cavity at 290 ° C., and the same operation as in Example 1 (2) was performed to produce a decorative molded product. However, the resin temperature at the time of injection was too low. And could not be molded.

[note]
1) Type of adhesive A: Acrylic resin [softening temperature: 125 ° C]
B: Acrylic resin [softening temperature: 129 ° C.]
C: Acrylic resin [softening temperature: 135 ° C.]
D: mixed resin of 1: 1 mass ratio of acrylic resin [softening temperature: 102 ° C.] and vinyl chloride-vinyl acetate copolymer [softening temperature: 72 ° C.] [softening temperature: 87 ° C. (calculated value)]
E: Acrylic resin [softening temperature: 102 ° C.]
F: Acrylic resin [softening temperature: 155 ° C.]

As is apparent from Table 1, in all of the examples, the value of “softening temperature of the adhesive-mold temperature during injection molding” is 25 to 65 ° C., and “resin temperature during injection molding— The value of the “softening temperature of the adhesive” is in the range of 90 to 190 ° C. and satisfies both the above conditions.
On the other hand, the comparative example does not satisfy one or both of the above conditions.

  The three-dimensional molded decorative film of the present invention is a decorative film used in an injection molding simultaneous decoration method for imparting design properties to a decorative resin molded product, and includes an injection resin molded body and a decorative film. A decorative resin molded article with good adhesion can be provided.

DESCRIPTION OF SYMBOLS 10 Decorative film 11 for laminate Base material 12 Release layer 13 Protective layer 14 Primer layer 15 Decorative layer 16 Adhesive layer 17 Transfer layer 18 Injection resin molded body 20 Decorative film for transfer 30 Decorative molded product 40 Decorative molded product

Claims (9)

  On the base material, the value of “softening temperature of the adhesive—mold temperature during injection molding” is 25 to 65 ° C. as an adhesive, and “resin temperature during injection molding—softening temperature of the adhesive” The manufacturing method of the three-dimensional shaping decoration film including the process of laminating | stacking an adhesive bond layer using the adhesive agent whose value is 90-190 degreeC.   Furthermore, it has the process of laminating a decoration layer on a base material, The manufacturing method of the three-dimensional molded decoration film of Claim 1 which laminates | stacks an adhesive bond layer on this decoration layer.   Further, a step of laminating a release layer on the substrate, a step of laminating an ionizing radiation curable resin composition layer containing a polymerizable (meth) acrylate oligomer on the release layer, and the ionizing radiation curable resin composition The tertiary according to claim 1, further comprising a step of irradiating the layer with ionizing radiation to form a protective layer by crosslinking and curing the ionizing radiation curable resin composition layer, and laminating an adhesive layer on the protective layer. Production method of original molded decorative film.   The method for producing a three-dimensional decorative film according to claim 3, further comprising a step of laminating a decorative layer on the protective layer, and laminating an adhesive layer on the decorative layer.   The method for producing a three-dimensional decorative film according to any one of claims 1 to 4, wherein the adhesive layer is a heat seal layer.   The decorative molded product which uses the three-dimensional molded decorative film obtained by the manufacturing method of any one of Claims 1-5.   The three-dimensional molded decorative film obtained by the production method according to any one of claims 1 to 5 is arranged with the base material side facing into the mold, and the tertiary from the adhesive layer side by a hot platen. The step of heating the original molded decorative film, the step of preforming the heated three-dimensional molded decorative film along the inner shape of the mold, and closely contacting the inner surface of the mold, and then clamping the injection resin A method for producing a decorative molded product, including a step of injecting the product into the inside and a step of taking out the decorative molded product from the mold after the injection resin has cooled.   Furthermore, the manufacturing method of the decorative molded product of Claim 7 including the process of peeling a base material and a release layer from a decorative molded product.   The method for producing a decorative molded product according to claim 7 or 8, wherein the injection resin is a polycarbonate resin.

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