WO2012176742A1 - インモールド成形用転写フィルムおよびその製造方法 - Google Patents
インモールド成形用転写フィルムおよびその製造方法 Download PDFInfo
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- WO2012176742A1 WO2012176742A1 PCT/JP2012/065553 JP2012065553W WO2012176742A1 WO 2012176742 A1 WO2012176742 A1 WO 2012176742A1 JP 2012065553 W JP2012065553 W JP 2012065553W WO 2012176742 A1 WO2012176742 A1 WO 2012176742A1
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- layer
- mold
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- KZOCFZSBERZALM-UHFFFAOYSA-N oxolane;propane-1,2,3-triol Chemical compound C1CCOC1.OCC(O)CO KZOCFZSBERZALM-UHFFFAOYSA-N 0.000 description 1
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- 150000003460 sulfonic acids Chemical class 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14688—Coating articles provided with a decoration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14811—Multilayered articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14827—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using a transfer foil detachable from the insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0036—Heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
- B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
- B44C1/17—Dry transfer
- B44C1/1712—Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
- B44C1/1729—Hot stamping techniques
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2451/00—Decorative or ornamental articles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24851—Intermediate layer is discontinuous or differential
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31515—As intermediate layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31554—Next to second layer of polyamidoester
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31598—Next to silicon-containing [silicone, cement, etc.] layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/31652—Of asbestos
- Y10T428/31663—As siloxane, silicone or silane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31942—Of aldehyde or ketone condensation product
- Y10T428/31946—Next to second aldehyde or ketone condensation product
Definitions
- the present invention relates to an in-mold transfer film, and more particularly to an in-mold transfer film excellent in solvent resistance, heat resistance, durability, blocking resistance and moldability, and a method for producing the same.
- In-mold molding means that when a plastic or ceramic injection molding is performed, a designed film is sandwiched in the mold, and at the same time as the injection molding, images, photographs, etc. are placed on the surface of the plastic in the mold. It is a technology that performs transfer.
- Transfer film for in-mold molding is used for in-mold molding technology. It gives decoration and other functions by peeling the transfer layer from the base film and transferring it to the molded product that is the transfer target. It is a printed film.
- the transfer film for in-mold molding is widely used for the purpose of decorating and protecting the surface of casings of mobile phone terminals, notebook PCs, digital cameras and the like, other home appliances and cosmetic containers, and automobile parts.
- IML In-mold lamination
- the transfer film for in-mold molding is generally composed of a base film, a release layer, an IMD layer, a print layer, and an adhesive layer, and is peeled off at the interface between the release layer and the IMD layer after injection molding. Therefore, the outermost surface of the molded product is an IMD layer, and the role of the IMD layer is very important for obtaining a molded product having excellent durability, chemical resistance, and moldability.
- a layer made of an active energy ray-curable resin has been used for the IMD layer.
- a method for producing a transfer film for in-mold molding there is a method of irradiating active energy rays at the time of film production to crosslink and cure (precure) the active energy ray-curable resin. The followability is poor and cracks are easily generated.
- active energy rays are not irradiated at the time of film production, and the active energy rays are irradiated to the outermost IMD layer after transferring the IMD layer to the molded product, thereby crosslinking the active energy ray curable resin.
- a method of curing (after-curing) is widely adopted.
- the above method has the following problems.
- the fluidity and tackiness of the active energy ray-curable resin remain only in the heat drying process, and during the roll-to-roll manufacturing, the resin is transferred to the guide roll, or at the winding part. There were problems such as blocking. Further, when injection molding resin or the like is injected into the mold during injection molding, a phenomenon (gate flow) may occur in which the IMD layer or the print layer near the mold injection portion (gate portion) flows out by the injected resin. there were.
- JP-A-2-261614 Japanese Patent No. 3233595 Japanese Patent No. 4683392
- the present invention solves the above-mentioned conventional problems, is excellent in solvent resistance, heat resistance, durability, blocking resistance, moldability, and can suppress the generation of gate flow, and a method for producing the same It is an issue to provide.
- the present inventors have mixed an active energy ray curable resin and a thermosetting resin in the IMD layer, and further crosslinked with the thermosetting resin in the heat drying step.
- a three-dimensional network structure was formed in the IMD layer, and it was found that a transfer film excellent in solvent resistance, heat resistance, durability, and blocking resistance can be obtained even before active energy ray curing.
- an anchor layer is provided as a heat-resistant layer
- the thermosetting resin contained in the IMD layer is also added to the anchor layer and cured to improve the IMD layer / anchor layer adhesion. .
- the molded body after transfer is irradiated with active energy rays to crosslink and cure the IMD layer, thereby forming an interpenetrating polymer network structure (IPN structure) and finally solvent resistance, heat resistance and durability.
- IPN structure interpenetrating polymer network structure
- the transfer film for in-mold molding is a transfer layer 11 transferred to an in-mold molded body, for example, as shown in FIG.
- a transfer layer 11 which is cured by: a film-like base material L0; the transfer layer 11 is laminated on the base material L0 and is disposed on the outermost surface of the molded body after in-mold molding.
- the IMD layer L2 has a mixed composition containing at least one active energy ray-curable resin and a thermosetting resin.
- the “IMD layer” refers to a layer disposed on the outermost surface of the molded body after in-mold molding.
- an IMD layer When comprised in this way, an IMD layer contains an active energy ray curable resin and a thermosetting resin, respectively. Therefore, when heated by drying or the like in the film manufacturing process, the thermosetting resin contained in the IMD layer is cured, and even before the active energy ray curable resin is cured, the IMD layer It can have solvent resistance, heat resistance, durability, and blocking resistance, and the moldability of the film is improved.
- “Laminated on (xxx layer)” is not limited to being directly laminated on the xxx layer, but may be indirectly laminated.
- a layer stacked on an IMD layer is not limited to a layer directly stacked on an IMD layer, but also includes a layer stacked indirectly (stacked via another layer).
- the in-mold molding transfer film according to the second aspect of the present invention is the in-mold molding transfer film according to the first aspect of the present invention.
- This is a layer obtained by curing the thermosetting resin contained in the IMD layer L2 by heating before transfer.
- the IMD layer contains a cured thermosetting resin.
- the IMD layer can have a hardness that does not generate a gate flow during injection molding.
- the IMD layer has nobi (softness) that follows the mold at the time of injection molding.
- the hardness of the IMD layer can be adjusted by shifting the timing for curing the active energy ray-curable resin and the thermosetting resin of the IMD layer. That is, when the IMD layer is laminated, the thermosetting resin is cured, and the IMD layer has a certain degree of hardness and heat resistance. This avoids gate flow in the IMD layer during injection molding.
- the IMD layer contains the active energy ray-curable resin before curing, generation of cracks during injection molding can be suppressed.
- the active energy ray-curable resin is cured by irradiation with active energy rays to further improve the hardness of the IMD layer.
- the in-mold molding transfer film according to the third aspect of the present invention is the in-mold molding transfer film according to the first aspect or the second aspect of the present invention, wherein the thermosetting resin is an epoxy resin. , At least one of melamine-based resin and urethane-based resin.
- Epoxy resins are heat-resistant, adhesive and chemical resistant, melamine-based resins are heat-resistant, hard and transparent, and urethane-based resins are excellent in adhesion and low-temperature curability, and can be selected and used as appropriate. .
- the in-mold molding transfer film according to the fourth aspect of the present invention is the in-mold molding transfer film according to any one of the first to third aspects of the present invention.
- the IMD layer includes a surface modification component (FIG. 1 (a)), or has a surface modification layer L2a (FIG. 1 (b)) on the surface that becomes the surface of the molded body after the transfer. .
- the IMD layer includes a surface modification component or has a surface modification layer on the surface side that becomes the surface of the IMD layer. Therefore, the durability of the IMD layer itself can be further improved. In addition, what is necessary is just to select suitably the compound which comprises a surface modification component or a surface modification layer according to the surface modification function to give to an IMD layer.
- the transfer film for in-mold molding according to the fifth aspect of the present invention is the transfer film for in-mold molding according to the fourth aspect of the present invention, wherein the surface modifying component or the surface modified layer is 1 or more types chosen from the compound containing a silicone compound, a fluorine compound, and fluorosilsesquioxane are included.
- the antifouling function can be imparted or improved to the IMD layer by the water / oil repellent effect of the compound containing a silicone compound, a fluorine compound, and fluorosilsesquioxane.
- the in-mold molding transfer film according to the sixth aspect of the present invention is the in-mold molding transfer film according to any one of the first to fifth aspects of the present invention.
- the transfer layer 11 is laminated on the side of the IMD layer L2 opposite to the substrate L0, and the cured heat increases the adhesion between the IMD layer L2 and the layer laminated on the IMD layer L2.
- It has an anchor layer L3 containing a curable resin; at least one kind of the thermosetting resin contained in the IMD layer L2 and the anchor layer L3 is the same type.
- the in-mold transfer film has an anchor layer containing a cured thermosetting resin.
- the anchor layer has heat resistance and can suppress generation of a gate flow during injection molding in in-mold molding.
- adhesion between the IMD layer and the layer can be improved when a layer is further stacked on the IMD layer.
- the anchor layer and the IMD layer each contain the same thermosetting resin, the adhesion between the IMD layer and the anchor layer can be improved.
- the transfer film for in-mold molding according to the seventh aspect of the present invention is the transfer film for in-mold molding according to the sixth aspect of the present invention.
- the transfer layer in the in-mold molding has a printing layer and an adhesive layer. Therefore, various designs and the like can be applied to the injection-molded resin using the printed layer. Furthermore, the adhesive layer can enhance the adhesion between the printed layer and the resin to be injection molded.
- the method for producing an in-mold molded product according to the eighth aspect of the present invention is, for example, as shown in FIG. 3, for in-mold molding according to any one of the first to seventh aspects of the present invention.
- an IMD layer contains active energy ray curable resin and thermosetting resin. Therefore, the hardness and heat resistance of the IMD layer can be improved by curing the thermosetting resin before the placing step and the injecting step, and the gate flow generated during the injecting step is suppressed. be able to. Furthermore, when it has an anchor layer, an anchor layer also contains a thermosetting resin. Therefore, the anchor layer also has heat resistance, and the gate flow generated during the injection process can be suppressed.
- the method for producing a transfer film for in-mold molding according to the ninth aspect of the present invention includes, for example, at least one active energy ray curable resin and a thermosetting resin, as shown in FIG. 1 (a) and FIG.
- a heating step (S02) of heating and curing the L2 resin includes, for example, at least one active energy ray curable resin and a thermosetting resin, as shown in FIG. 1 (a) and FIG.
- a heating step (S02) of heating and curing the L2 resin includes, for example, at least one active energy
- the IMD layer contains a cured thermosetting resin.
- the hardness and heat resistance of the IMD layer can be improved, and the gate flow generated during injection molding can be suppressed.
- the method for manufacturing an in-mold molding transfer film according to the tenth aspect of the present invention is the same as the method for manufacturing an in-mold molding transfer film according to the ninth aspect of the present invention, for example, FIG. 1 (a) and FIG.
- the step (S03) of laminating the anchor layer L3 for improving the adhesion with the layer laminated on the IMD layer L2 is provided on the side of the IMD layer L2 opposite to the substrate L0.
- the anchor layer is provided, the adhesion between the IMD layer and the layer can be improved when a layer is further laminated on the IMD layer.
- the method for producing an in-mold molded product according to the eleventh aspect of the present invention is, for example, as shown in FIG. 3, the method for producing a transfer film for in-mold molding according to the ninth aspect or the tenth aspect of the present invention.
- an IMD layer contains active energy ray curable resin and thermosetting resin. Further, the thermosetting resin is cured before the placing step and the injecting step. Therefore, the hardness and heat resistance of the IMD layer are improved, and the gate flow generated during the injection process can be suppressed.
- the IMD layer contains an active energy ray-curable resin and a thermosetting resin, it has excellent solvent resistance, heat resistance, durability, blocking resistance, and moldability, and can suppress the generation of gate flow.
- An in-mold transfer film can be obtained.
- FIG. 1 (a) illustrates the layer structure of an in-mold transfer film F10 configured in multiple layers, and the thickness of each layer is exaggerated.
- the in-mold transfer film F10 includes a film-like substrate L0 as a substrate, a release layer L1, an IMD layer L2, an anchor layer L3, a printed layer L4, and an adhesive layer L5.
- resin or the like is injection-molded on one surface side of the adhesive layer L5 (upper side of the adhesive layer L5 in FIG. 1A). As shown in FIG.
- the in-mold transfer film F10 is separated at the boundary surface between the release layer L1 and the IMD layer L2.
- the transfer layer 11 (IMD layer L2 / anchor layer L3 / print layer L4 / adhesive layer L5) is transferred to the resin, and the remaining film 12 (base material L0 / release layer L1) is separated and left.
- the base material L0 functions as a support during the production of the in-mold transfer film F10.
- Various plastic films can be used for the base material L0 as a film-like polymer resin.
- plastic film materials include polyester resins, acetate resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, and polyvinyl chloride resins.
- resins such as resins, polyvinylidene chloride resins, polystyrene resins, polyvinyl alcohol resins, polyarylate resins, polyphenylene sulfide resins, and cyclic polyolefin resins.
- PET polyethylene terephthalate
- PET polyethylene naphthalate
- triacetyl cellulose polyether sulfone
- polycarbonate polyarylate
- polyether ether ketone polyether ether ketone
- Polyethylene terephthalate (PET) and polyethylene naphthalate are more preferable because they are excellent in mechanical strength, dimensional stability, heat resistance, chemical resistance, optical properties, etc., and film surface smoothness and handling properties.
- Polycarbonate is more preferred because it is excellent in transparency, impact resistance, heat resistance, dimensional stability, and flammability. Considering price and availability, polyethylene terephthalate (PET) is particularly preferable.
- the film thickness of the substrate L0 is preferably 10 to 100 ⁇ m, more preferably 25 to 50 ⁇ m.
- the film thickness of the substrate L0 is 10 ⁇ m or more, the mechanical strength of the substrate can be maintained, and each layer of the in-mold transfer film F10 can be easily formed. Further, when the film thickness is 100 ⁇ m or less, the flexibility of the in-mold molding transfer film F10 can be maintained, which is suitable for in-mold molding (particularly following the mold).
- the release layer L1 is a layer for facilitating peeling of the transfer layer 11 (such as the IMD layer L2) from the base material L0.
- the mold release layer L1 can be abbreviate
- the material of the release layer L1 include melamine resins, polyolefin resins, epoxy resins, amino alkyd resins, silicone resins, fluororesins, acrylic resins, paraffin resins, urea resins, fiber resins, and the like. .
- methylated melamine resin such as methylated melamine resin, butylated melamine resin, methyl etherified melamine resin, butyl etherified melamine resin, methylbutyl mixed etherified melamine resin, etc. More preferred are melamine resins and polyolefin resins such as polyethylene and polypropylene.
- the film thickness of the release layer L1 is preferably 0.01 to 5 ⁇ m, more preferably 0.5 to 3 ⁇ m.
- the film thickness of the release layer L1 is 0.01 ⁇ m or more, stable release performance can be imparted on the substrate L0. Further, when the film thickness is 5 ⁇ m or less, the transition to the IMD layer L2 or the remaining of the IMD layer L2 on the release layer L1 can be prevented.
- the release layer L1 is laminated by applying a coating solution containing the resin as a main component on the substrate L0, heating the obtained coating film, and drying and curing the coating film.
- the coating liquid can be obtained by mixing the resin and, if necessary, various additives and solvents.
- the concentration of the resin component in the coating liquid can be appropriately selected by adjusting the viscosity according to a lamination method such as a wet coating method.
- the concentration is preferably, for example, 5 to 80% by weight, and more preferably 10 to 60% by weight.
- methyl isobutyl ketone, methyl ethyl ketone, butyl acetate, ethyl acetate, toluene, xylene, butanol, ethylene glycol monoethyl acetate and the like can be used.
- curable resin since curable resin is used as a coating liquid, it is preferable that it is liquid before hardening.
- a wet coating method in which a coating solution is uniformly coated.
- a gravure coating method a gravure coating method, a die coating method, or the like can be used.
- a gravure coating method a gravure roll with an uneven engraving process on the surface is dipped in the coating liquid, and the coating liquid adhering to the convex and concave parts on the surface of the gravure roll is scraped off with a doctor blade and stored accurately in the concave part. And transferring to the base material.
- a low viscosity liquid can be thinly coated by the gravure coating method.
- the die coating method is a method in which coating is performed while pressurizing and extruding a liquid from a coating head called a die.
- the die coating method enables highly accurate coating. Further, since the liquid is not exposed to the outside air during application, the concentration of the application liquid is hardly changed by drying.
- Other wet coating methods include spin coating, bar coating, reverse coating, roll coating, slit coating, dipping, spray coating, kiss coating, reverse kiss coating, air knife coating, and curtain coating. Method, rod coating method and the like. The lamination can be appropriately selected according to the required film thickness from these methods. Furthermore, by using the wet coating method, since it can be laminated at a line speed of several tens of meters per minute (for example, about 20 m / min), it can be manufactured in large quantities and the production efficiency can be increased.
- thermosetting resin When the thermosetting resin is cured by heating, for example, it is usually heated at a heating temperature of 80 to 160 ° C., preferably 120 to 150 ° C. At this time, when an oven is used, it may be heated for 10 to 120 seconds.
- the IMD layer L2 is a layer disposed on the outermost surface of the molded body after in-mold molding, and functions as a surface protective layer.
- the IMD layer L2 includes an active energy ray curable resin and a thermosetting resin.
- an active energy ray refers to an energy ray that can generate an active species by decomposing a compound that generates an active species. Examples of such active energy rays include optical energy rays such as visible light, ultraviolet rays, infrared rays, X-rays, ⁇ rays, ⁇ rays, ⁇ rays, and electron beams.
- the active energy ray curable resin include those capable of radical polymerization such as (meth) acrylate monomer, unsaturated polyester resin, polyester (meth) acrylate resin, epoxy (meth) acrylate resin, and urethane (meth) acrylate resin.
- a resin having a saturated bond can be mentioned. These resins may be used alone, or a plurality of resins may be used in combination.
- Examples of the (meth) acrylate monomer include compounds obtained by reacting a polyhydric alcohol with an ⁇ , ⁇ -unsaturated carboxylic acid.
- the (meth) acrylate having a cyclic structure include dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, isobornyl (meth) acrylate, tricyclode
- photopolymerizable monomers such as candiyl dimetadi (meth) acrylate, mono- and di (meth) acrylate having a terpene skeleton, and (meth) acrylate modified with respective ethylene glycol or propylene glycol.
- the condensation product (unsaturated polyester) by esterification reaction of a polyhydric alcohol and unsaturated polybasic acid (and saturated polybasic acid as needed) was melt
- the unsaturated polyester can be produced by polycondensation of an unsaturated acid such as maleic anhydride and a diol such as ethylene glycol.
- a polybasic acid having a polymerizable unsaturated bond such as fumaric acid, maleic acid, and itaconic acid or its anhydride is used as an acid component, and ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1, 2 -Butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, cyclohexane
- Polyhydric alcohols such as 1,4-dimethanol, ethylene oxide adduct of bisphenol A and propylene oxide adduct of bisphenol A are reacted as alcohol components, and phthalic acid, isophthalic acid, terephthalic acid, Such as tetrahydrophthalic acid, adipic acid, sebacic acid Polymerizable not have an unsaturated bond
- polyester (meth) acrylate resin (1) a terminal carboxyl group polyester obtained from a saturated polybasic acid and / or an unsaturated polybasic acid and a polyhydric alcohol contains an ⁇ , ⁇ -unsaturated carboxylic ester group.
- saturated polybasic acid used as a raw material for polyester (meth) acrylate examples include polybasic compounds having no polymerizable unsaturated bond such as phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, adipic acid, and sebacic acid.
- examples include acids or anhydrides thereof and polymerizable unsaturated polybasic acids such as fumaric acid, maleic acid and itaconic acid or anhydrides thereof.
- the polyhydric alcohol component is the same as the unsaturated polyester.
- the epoxy (meth) acrylate resin that can be used in the present invention is a polymerization produced by a ring-opening reaction between a compound having a glycidyl group (epoxy group) and a carboxyl group of a carboxyl compound having a polymerizable unsaturated bond such as acrylic acid. And those having a polymerizable unsaturated bond (vinyl ester) dissolved in a polymerizable monomer.
- the vinyl ester is produced by a known method, and examples thereof include epoxy (meth) acrylate obtained by reacting an epoxy resin with an unsaturated monobasic acid such as acrylic acid or methacrylic acid.
- epoxy resins may be reacted with bisphenol (for example, A type) or dibasic acid such as adipic acid, sebacic acid, dimer acid (Haridimer 270S: Harima Kasei Co., Ltd.) to impart flexibility.
- bisphenol for example, A type
- dibasic acid such as adipic acid, sebacic acid, dimer acid (Haridimer 270S: Harima Kasei Co., Ltd.
- examples of the epoxy resin as a raw material include bisphenol A diglycidyl ether and its high molecular weight homologues, novolak glycidyl ethers, and the like.
- urethane (meth) acrylate resin for example, after reacting a polyisocyanate with a polyhydroxy compound or a polyhydric alcohol, a hydroxyl group-containing (meth) acrylic compound and, if necessary, a hydroxyl group-containing allyl ether compound are reacted. And a radical-polymerizable unsaturated group-containing oligomer that can be obtained.
- polyisocyanate examples include 2,4-tolylene diisocyanate and its isomers, diphenylmethane diisocyanate, hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate, naphthalene diisocyanate, Phenylmethane triisocyanate, Vernock D-750, Crisbon NK (trade name: manufactured by Dainippon Ink and Chemicals), Desmodur L (trade name: manufactured by Sumitomo Bayer Urethane Co., Ltd.), Coronate L (trade name: Japan) Polyurethane Industry Co., Ltd.), Takenate D102 (trade name: manufactured by Mitsui Takeda Chemical Co., Ltd.), Isonate 143L (trade name: manufactured by Mitsubishi Chemical Corporation), and the like.
- polyhydroxy compound examples include polyester polyol, polyether polyol, and the like.
- polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 2-methyl-1,3-propanediol, 1,3- Butanediol, adduct of bisphenol A and propylene oxide or ethylene oxide, 1,2,3,4-tetrahydroxybutane, glycerin, trimethylolpropane, 1,3-butanediol, 1,2-cyclohexane glycol, 1,3 -Cyclohexane glycol, 1,4-cyclohexane glycol, para-xylene glycol, bicyclohexyl-4,4-diol, 2,6-decalin glycol, 2,7-decalin glycol, etc.
- the hydroxyl group-containing (meth) acrylic compound is not particularly limited, but is preferably a hydroxyl group-containing (meth) acrylic acid ester, specifically, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxy Propyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, di (meth) acrylate of tris (hydroxyethyl) isocyanuric acid, pentaerythritol tri (meth) ) Acrylate and the like.
- a hydroxyl group-containing (meth) acrylic acid ester specifically, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxy Propyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, di (me
- thermosetting resin examples include phenol resin, alkyd resin, melamine resin, epoxy resin, urea resin, unsaturated polyester resin, urethane resin, thermosetting polyimide, and silicone resin. These resins may be used alone, or a plurality of resins may be used in combination. Specifically, bisphenol A type epoxy resin, bisphenol F type epoxy resin, polyfunctional epoxy resin, flexible epoxy resin, brominated epoxy resin, glycidyl ester type epoxy resin, polymer type epoxy resin, biphenyl type epoxy resin, etc.
- Epoxy resins are heat-resistant, adhesive and chemical resistant, melamine-based resins are heat-resistant, hard and transparent, and urethane-based resins are excellent in adhesion and low-temperature curability, and can be selected and used as appropriate. .
- the active energy ray-curable resin can be cured by irradiating an ultraviolet ray (UV) or an electron beam with an active energy ray source. A case where the active energy ray-curable resin is used after being irradiated with UV will be described.
- the active energy ray-curable resin is preferably one that is cured by irradiation with UV in the presence of a photopolymerization initiator for polymerization.
- photopolymerization initiators examples include various benzoin derivatives, benzophenone derivatives, phenyl ketone derivatives, onium salt photoinitiators, organometallic photoinitiators, metal salt cationic photoinitiators, photodegradable organosilanes, and latent sulfonic acids. And phosphine oxide.
- the addition amount of the photopolymerization initiator is preferably 1 to 5 parts by weight with respect to 100 parts by weight of the active energy ray-curable resin.
- thermosetting resin needs to be rapidly cured at a desired curing temperature (80 to 160 ° C.) and time (30 to 180 seconds).
- a curing reaction initiator or a curing reaction accelerator may be used.
- epoxy resins aliphatic amines and aromatic amine amines, polyamide resins, tertiary amines and secondary amines, imidazoles, polymercaptans, acid anhydrides, Lewis acid complexes, melamine resins
- an organometallic urethanization catalyst and a tertiary amine urethanization catalyst can be exemplified.
- the mixing ratio of the active energy ray-curable resin and the thermosetting resin is preferably 80:20 to 30:70 by weight. If the thermosetting resin is 20% by weight or more, heat resistance and solvent resistance can be exhibited. If the thermosetting resin is 70% by weight or less, in-mold molding (especially following the mold) Suitable for).
- the film thickness of the IMD layer L2 is preferably 0.1 to 50 ⁇ m, more preferably 1 to 20 ⁇ m.
- the film thickness of the IMD layer L2 is 0.1 ⁇ m or more, a cross-linked structure of the thermosetting resin is easily formed, and thus durability and chemical resistance are not easily lowered. Moreover, it can avoid that the residual solvent amount at the time of solvent drying increases that the film thickness is 50 micrometers or less, and the hardness and durability of the coating film after hardening become inadequate.
- the IMD layer L2 is laminated by applying a coating liquid containing the resin as a main component on the release layer L1, heating the obtained coating film, and drying and curing the coating film.
- the coating liquid may be mixed with various additives such as wax, silica, plasticizer, leveling agent, surfactant, dispersant, antifoaming agent and solvent as required.
- a wet coating method in which a coating solution is uniformly coated.
- the heating is usually performed at a heating temperature of 80 to 160 ° C., preferably 120 to 150 ° C.
- heating may be performed for 30 to 180 seconds.
- the heating temperature is low or the heating time is short, the solvent remains, and the thermosetting resin may not be sufficiently crosslinked and cured. Further, when the heating temperature is high or the heating time is long, a heat wave is generated in the base film. It is preferable to select appropriate processing conditions as appropriate according to the type of resin and the mixing ratio.
- the IMD layer may have a surface modification function.
- a water / oil repellent function or an antifouling function may be imparted using a surface modifier such as a silicone compound, a fluorine compound, or a compound containing fluorosilsesquioxane.
- An antireflection function may be imparted by applying a low reflection treatment (AR treatment) using an organic or inorganic low refractive index material or a high refractive material.
- an anti-glare function may be imparted using an anti-glare treatment agent containing organic / inorganic particles. Water repellency / oil repellency may be further adjusted to impart a fingerprint adhesion suppression / prevention function or the like. As shown in FIG.
- the surface modification of the IMD layer can be performed by adding a compound that exhibits a surface modification function to the coating solution for the IMD layer L2 to form the IMD layer L2.
- an IMD layer L2 ′ having a surface modification layer L2a may be formed by forming a surface modification layer L2a containing a compound that exhibits a surface modification function. It is preferable to select a compound (resin or the like) that exhibits a surface modification function as appropriate in accordance with the required function.
- the IMD layer L2 ′ having the surface modification layer In the case of forming the IMD layer L2 ′ having the surface modification layer, first, a coating solution containing a compound that exhibits a surface modification function as a main component is prepared and applied onto the release layer L1, and the obtained coating is obtained. The film is heated, dried and cured as necessary (formation of L2a). Then, the coating liquid of IMD layer L2 is apply
- the antifouling agent is preferably one or more compounds selected from the group consisting of silicone compounds, fluorine compounds, fluorosilsesquioxane, and fluorosilsesquioxane polymers described in WO2008 / 072766 and WO2008 / 072765. .
- silicone compounds examples include BYK-UV3500, BYK-UV-3570 (both manufactured by Big Chemie), TEGO Rad2100, 2200N, 2250, 2500, 2600, 2700 (all manufactured by Degussa), X-22-2445, X- 22-2455, X-22-2457, X-22-2458, X-22-2459, X-22-1602, X-22-1603, X-22-1615, X-22-1616, X-22 1618, X-22-1619, X-22-2404, X-22-2474, X-22-174DX, X-22-8201, X-22-2426, X-22-164A, X-22-164C ( Any of them may be Shin-Etsu Chemical Co., Ltd.).
- Fluorine compounds include OPTOOL DAC, OPTOOL DAC-HP, R-1110, R-1210, R-1240, R-1620, R-1820, R-2020, R-5210, R-manufactured by Daikin Industries, Ltd. 5410, R-5610, R-5810, R-7210, R-7310, and the like.
- the compound that expresses the surface modification function is, for example, a fluorosilsesquioxane compound having a molecular structure represented by the following formula (I) or a polymer (homopolymer or copolymer) containing the fluorosilsesquioxane compound. ).
- the IMD layer L2 (L2 ′) can be given a function of reducing the adhesion of dirt. As shown in Examples 5 and 6, it is possible to actually increase the hardness and to improve the water repellency and oil repellency leading to the addition of antifouling and fingerprint resistance functions by reducing the surface free energy. it can.
- the compound When adding a compound that expresses the surface modification function to the coating solution of the IMD layer L2, it is preferable to add the compound directly to the coating solution or add the compound to the coating solution after dissolving the compound in an organic solvent.
- the addition amount is preferably 0.1 to 20% by weight based on the total amount of resin (active energy ray curable and thermosetting resin) necessary for forming the IMD layer.
- the ratio of the compound that exhibits the surface modification function is 20% by weight or more, the curability of the resin necessary for forming the IMD layer is hindered, and the adhesiveness is likely to be lowered. Further, when the content is 0.1% by weight or less, it is difficult to sufficiently develop the surface modification function.
- a compound is dissolved in an organic solvent to separately prepare a coating solution.
- a wet coating method in which a coating solution is uniformly coated.
- the coating solution for the surface modification layer L2a is preferably used so that the content of the compound is about 10 to 80% by weight in consideration of coating properties.
- the film thickness of the surface modification layer L2a is preferably 0.01 to 10 ⁇ m. When the film thickness is 0.01 ⁇ m or more, the surface modification function can be expressed. Further, when the film thickness is 10 ⁇ m or less, it is possible to avoid an increase in the amount of residual solvent at the time of solvent drying, and insufficient hardness and durability of the coating film after curing.
- the anchor layer L3 is a layer for improving (adhering) adhesion between the IMD layer L2 and a layer stacked on the IMD layer L2.
- the material of the anchor layer L3 include phenol resins, alkyd resins, melamine resins, epoxy resins, urea resins, unsaturated polyester resins, urethane resins, thermosetting polyimides, and silicone resins.
- thermoplastic resins such as vinyl chloride-vinyl acetate copolymer resin, acrylic resin, chlorinated rubber, polyamide resin, nitrified cotton resin, polyamide resin, and cyclic polyolefin resin.
- bisphenol A type epoxy resin bisphenol F type epoxy resin, polyfunctional epoxy resin, flexible epoxy resin, brominated epoxy resin, glycidyl ester type epoxy resin, polymer type epoxy resin, biphenyl type epoxy resin, etc.
- the anchor layer L3 may be composed of a plurality of thermosetting resins.
- it comprises an epoxy resin and a urethane resin.
- an epoxy resin in each of the anchor layer L3 and the IMD layer L2
- the adhesion between the anchor layer L3 and the IMD layer L2 can be improved.
- a urethane resin in each of the anchor layer L3 and the printing layer L4
- adhesion between the anchor layer L3 and the printing layer L4 can be improved.
- a urethane resin the stretchability of the layer can be maintained while having thermosetting properties. Therefore, it is possible to maintain a nob (softness) that follows the mold during injection molding.
- a preferable mixing ratio when an epoxy resin and a urethane resin are used for the anchor layer is a weight ratio of 5:95 to 50:50. If the epoxy resin is 5% by weight or more, it is possible to improve the adhesion to the IMD layer L2, and if the epoxy resin is 50% by weight or less, in-mold molding (especially following the mold). Suitable for.
- the film thickness of the anchor layer L3 is preferably 0.1 to 50 ⁇ m, more preferably 0.5 to 10 ⁇ m.
- the thickness of the anchor layer L3 is 0.1 ⁇ m or more, a crosslinked structure of the thermosetting resin is easily formed, and thus durability and chemical resistance are not easily lowered. Further, when the film thickness is 50 ⁇ m or less, it can be avoided that the amount of residual solvent at the time of solvent drying increases and the blocking resistance becomes insufficient.
- Anchor layer L3 is laminated
- the coating liquid may be mixed with various additives such as wax, silica, plasticizer, leveling agent, surfactant, dispersant, antifoaming agent and solvent as required.
- a wet coating method in which a coating solution is uniformly coated.
- conditions for curing the thermosetting resin by heating may be used. For example, the heating is usually performed at a heating temperature of 80 to 160 ° C., preferably 120 to 150 ° C.
- heating may be performed for 30 to 180 seconds.
- the heating temperature is low or the heating time is short, the solvent remains, and the thermosetting resin may not be sufficiently crosslinked and cured. Further, when the heating temperature is high or the heating time is long, a heat wave is generated in the base film.
- Appropriate processing conditions are selected according to the type of resin and the mixing ratio.
- an anchor, L stabilizer, or antioxidant may be added to the anchor layer L3 as necessary.
- the ultraviolet absorber include benzotriazoles, hydroxyphenyltriazines, benzophenones, salicylates, cyanoacrylates, and triazines.
- a hindered amine type light stabilizer is mentioned as an ultraviolet stabilizer.
- the antioxidant include phenol-based, sulfur-based and phosphoric acid-based antioxidants. The addition amount of the additive is preferably 0.01 to 20 parts by weight with respect to 100 parts by weight of the resin forming the anchor layer L3.
- Print layer L4 / Adhesive layer L5 With reference to Fig.1 (a), printing layer L4 / adhesion layer L5 is demonstrated.
- a printing layer L4 for decorating the in-mold molding transfer film F10 with a pattern or the like, and for bonding the printing layer L4 to a resin to be injection-molded at the time of in-mold molding.
- the adhesive layer L5 is formed.
- a protective layer L6 for antiblocking or antistatic may be provided on one surface of the base material L0 (the lower side of the base material L0 in FIG. 1A). . By providing the anti-blocking property, the protective layer L6 can suppress blocking when wound on a roll in the film production process.
- a coating agent containing various inorganic particles, organic particles, quaternary ammonium salts, siloxane, surfactants and the like may be used.
- the anchor layer L3 is laminated on the IMD layer L2 by a wet coating method and thermally cured (S03). Further, the printing layer L4 is laminated on the anchor layer L3 (S04). Finally, the adhesive layer L5 is laminated on the printing layer L4 (S05). Since lamination is performed by a wet coating method, lamination can be performed at a line speed of several tens of meters per minute (for example, about 20 m / min), and production efficiency can be increased. In steps S01 to S03, the layers are thermally cured for each wet coating, so that each layer can be reliably formed while avoiding mixing of the coating liquid. In addition, it is preferable to perform thermosetting to such an extent that it does not prevent the nobi required for the injection molding which is a post process.
- the manufactured transfer film for in-mold molding is transferred to a resin or the like on which the transfer layer is injection-molded in the later-described in-mold molding (injection molding step S06), and peeled off from the transfer film for in-mold molding (residual film) Remains).
- injection molding step S06 injection molding step S06
- residual film residual film
- an in-mold molded body is formed by the transfer layer and the resin.
- the transferred transfer layer is irradiated with active energy rays (for example, UV) in the curing of the IMD layer surface (S07).
- active energy rays for example, UV
- the IMD layer L2 is configured by mixing an active energy ray-curable resin with a thermosetting resin.
- a thermosetting resin By curing the thermosetting resin contained in the IMD layer L2 by heating before in-mold molding (for example, at the time of drying), the IMD layer L2 has a certain amount even before irradiation with active energy rays (for example, UV). Have hardness.
- resin enters the mold at a pin gate (one point) or a valve gate (one point), and the resin spreads to obtain an in-mold molded body.
- the method for producing an in-mold molding transfer film of the present application can provide an in-mold molding transfer film excellent in moldability, heat resistance, durability, and blocking resistance and solvent resistance. .
- FIG. 3 the usage example of the transfer film for in-mold shaping
- injection molding injection molding process S06
- the injection molding step S06 will be described using an in-mold transfer film (IMD film F10) manufactured by the in-mold transfer film manufacturing method.
- the IMD film F10 does not have the protective layer L6.
- Film Feed The IMD film F10 is supplied from the film feed device so that the base PET side is the mold (the left mold in FIG. 3) side, and the IMD film F10 is predetermined by a sensor fixed to the mold. Guided to position. 2. Suction IMD film F10 is clamped and then sucked to form a mold. 3. Injection molding Close the mold and injection mold the resin. 4).
- the transfer take-out robot enters and the in-mold molded body (molded body 13) is projected from the fixed side (the transfer layer is peeled off from the remaining film 12 and transferred to the resin to form the molded body 13).
- the active energy ray curable resin in the IMD layer is cured by irradiating the IMD layer surface with active energy rays.
- UV irradiation for curing the active energy ray-curable resin As a curing method by UV irradiation for curing the active energy ray-curable resin, UV having a wavelength of 200 to 400 nm from a UV lamp (for example, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a metal halide lamp, or a high-power metal halide lamp) is used.
- the IMD layer may be irradiated for a short time (within several seconds to several tens of seconds).
- the IMD layer may be irradiated with a low energy electron beam from a self-shielding low energy electron accelerator of 300 keV or less.
- the transfer film for in-mold molding of the present application it becomes possible to decorate a casing of a mobile phone terminal, a notebook PC, a digital camera, etc., other home appliances, cosmetic containers, and even automobile parts. Furthermore, the transfer film for in-mold molding of the present application is excellent in solvent resistance, heat resistance, durability, blocking resistance, and moldability, and enables stronger surface protection.
- the obtained coating liquid C1 was treated with R.I. D. Using a coating rod (# 6) manufactured by Specialties Co., Ltd., the base film L0 was coated on an easily adhesive coated surface of a polyethylene terephthalate film (thickness: 50 ⁇ m, G440E) manufactured by Mitsubishi Plastics. The obtained coating film was dried simultaneously with curing in a high temperature chamber at 150 ° C. for 20 seconds to obtain a film F1 having a release layer L1 having a thickness of 1 ⁇ m. The film thickness of the coating film was calculated from the difference in film thickness obtained by measuring the film thickness of the coated surface and the uncoated surface with a digital micro “MF-501 + counter TC-101” manufactured by Nikon Corporation.
- UV reactive acrylic resin containing photoinitiator as active energy ray curable resin (DIC Corporation: UVT Clear (trade name) NSF-001, including about 37% by weight of resin component in the product) 56.0% by weight
- alicyclic polyfunctional epoxy resin (Daicel Chemical Industries, Ltd .: Celoxide 3150, epoxy equivalent: 180 g / mol) is 9.0% by weight
- 2-butanone (MEK) is used as a diluting solvent.
- Coating liquid C2-1 (resin component concentration 30% by weight) consisting of 5% by weight and 0.5% by weight of a cationic polymerization initiator (Sanshin Chemical Co., Ltd .: Sun-Aid (trade name) SI-60) as a curing agent Prepared.
- the obtained coating liquid C2-1 was treated with R.I. D.
- the coating was applied on the surface of the release layer L1 of the film F1 using a coating rod (# 16) manufactured by Specialties.
- the obtained coating film was dried in a high temperature chamber at 140 ° C. for 60 seconds to obtain a film F2-1 having an IMD layer L2-1 having a thickness of 4 ⁇ m.
- the film F2-1 has a film configuration in which a base film L0 (PET), a release layer L1, and an IMD layer L2-1 are laminated in this order.
- Example 2 In the formation of the IMD layer, instead of the coating liquid C2-1, UV reactive acrylic resin with a photoinitiator (DIC Corporation: UVT Clear (trade name) NSF-001) 40.5% by weight, alicyclic type poly Functional epoxy resin (Daicel Chemical Industries, Ltd .: Celoxide 3150, epoxy equivalent: 180 g / mol) 15.0% by weight, 2-butanone (MEK) 43.6% by weight, cationic polymerization initiator (Sanshin Chemical Co., Ltd.) ): Sun-Aid (trade name) SI-60) Same as Example 1 except that coating liquid C2-2 (resin component concentration 30% by weight) comprising 0.9% by weight was used to obtain IMD layer L2-2. The film F2-2 was obtained by laminating the base film L0 (PET), the release layer L1, and the IMD layer L2-2 in this order.
- coating liquid C2-2 coating liquid C2-2 (resin component concentration 30% by weight) comprising 0.9% by weight was used to obtain IMD layer L2-2.
- the crack generation elongation was determined from the following equation. (Crack generation distance-Chuck distance) / Chuck distance x 100 5) Total light transmittance Only the IMD layer of the film before UV curing was taken out as a film, and the total light transmittance was measured based on JIS K7361 using a Nippon Denshoku Industries Co., Ltd. haze meter "NDH5000". 6) Haze Only the IMD layer of the film before UV curing was taken out as a film, and the haze value was measured based on JIS K7136 using a Nippon Denshoku Industries Co., Ltd. haze meter “NDH5000”.
- an ultraviolet ray was irradiated at an illuminance of 200 mW / cm 2 and an exposure amount of 1000 mJ / cm 2 to obtain a UV cured film.
- the exposure amount was measured with an illuminometer (UVPF-A1 / PD-365, manufactured by Iwasaki Electric Co., Ltd.). 9) Pencil hardness measurement
- the IMD layer side of the film after UV irradiation was measured according to JIS K5600 using a surface property tester HEIDON Type: 14W (manufactured by Shinto Kagaku Co., Ltd.).
- the films having the IMD layer containing the thermosetting resin are excellent in heat resistance, durability and moldability.
- the strength of the connected film is greatly improved.
- the solvent resistance and blocking resistance were improved, and the processability during film production was also improved.
- the printability when applying the anchor layer is excellent due to the increase in the surface free energy value.
- the obtained coating liquid C3-1 was added to R.I. D. Using a coating rod (# 9) manufactured by Specialties, it was applied on the IMD layer surface of film F2-1.
- the obtained coating film was dried in a high temperature chamber at 140 ° C. for 60 seconds to obtain a film F3-1 having an anchor layer L3-1 having a thickness of 2 ⁇ m.
- the film F3-1 has a film configuration in which a base film L0 (PET), a release layer L1, an IMD layer L2-1, and an anchor layer L3-1 are laminated in this order. That is, the film F3-1 is a film in which the anchor layer L3-1 is laminated on the film F2-1 of Example 1.
- Example 4 In forming the anchor layer, the same operation as in Example 3 was performed except that the film F2-2 was used instead of the film F2-1 to obtain the anchor layer L3-1, and the base film L0 (PET), A film F3-2 was obtained in which the release layer L1, the IMD layer L2-2, and the anchor layer L3-1 were laminated in this order. That is, the film F3-2 is a film in which the anchor layer L3-1 is laminated on the film F2-2 of Example 2.
- the film F3-3 is a film in which the anchor layer L3-2 is laminated on the film F2-3 of Comparative Example 1.
- the created test piece was pulled with a tensile tester (Orientec Co., Ltd., Tensilon RTM-250, maximum load capacity 2.5 kN) under the conditions of speed 2 mm / min, distance between chucks 100 mm, and the distance at which cracks occurred was measured. did.
- the crack generation elongation was determined from the following equation. (Crack generation distance-Chuck distance) / Chuck distance x 100 5)
- Total light transmittance Take out the film consisting of the IMD layer and anchor layer of the film before UV curing, and use the Nippon Denshoku Industries Co., Ltd. haze meter "NDH5000" to determine the total light transmittance based on JIS K7361. It was measured.
- Peeling force measurement A commercially available cellophane tape (manufactured by Nichiban Co., Ltd., Cellotape (registered trademark) CT-24, tape width 24 m) is bonded to the anchor layer surface of the film before UV curing, and 1 reciprocating pressure is applied with a 2 kg pressure roller. Then, the peel strength between the release layer and the IMD layer of the film 30 minutes after the press bonding was measured with a tensile tester (manufactured by Toyo Seiki Seisakusho, Strograph VES05D, maximum load capacity 50 N).
- a tensile tester manufactured by Toyo Seiki Seisakusho, Strograph VES05D, maximum load capacity 50 N).
- the peel force measured value is a value (N / cm) obtained by dividing the force (N) required for peeling obtained under the condition of a separation distance of 100 mm, an angle of 180 degrees and a peeling speed of 300 mm / min by the tape width (cm). It was.
- the films having the IMD layer and the anchor layer containing the thermosetting resin have heat resistance and durability.
- the strength of the film that leads to formability is greatly improved.
- the solvent resistance and blocking resistance are also improved, and the processability during film production is also excellent.
- the exposure amount was measured with an illuminometer (UVPF-A1 / PD-365, manufactured by Iwasaki Electric Co., Ltd.). 4) Pencil hardness measurement The transfer layer side of the UV molded product after UV irradiation was measured according to JIS K5600 using a surface property tester HEIDON Type: 14W (manufactured by Shinto Kagaku Co., Ltd.). . 5) Adhesion test The transfer molded product after UV irradiation was dipped in hot water at 70 ° C. for 30 minutes, dried, and then 11 cuts were made on the transfer layer side at 1 mm intervals in the vertical and horizontal directions.
- Films (Example 3 and Example 4) having an IMD layer and an anchor layer containing a thermosetting resin prevent gate flow at the time of injection molding and improve the followability of the film (film) of the three-dimensional structure part. It can be seen that the moldability is excellent. Further, it can be seen that after UV irradiation, the hardness is increased, the adhesion between the layers is improved, and the durability is excellent.
- the weight average molecular weight and polydispersity index were measured using gel permeation chromatography (GPC, model number: Alliance 2695, manufactured by Waters, column: Shodex GPC KF-804L x 2 (in series), guard column: KF-G). did.
- Chemical substance A has a molecular structure represented by the following formula (I).
- Example 5 ⁇ Formation of release layer>
- a film F1 having a release layer L1 was obtained.
- ⁇ Formation of IMD layer having surface modified layer> First, a MEK solution of the polymer A-1 was added to R.I. D. The coating was applied on the surface of the release layer L1 of the film F1 using a coating rod (# 6) manufactured by Specialties. The obtained coating film was dried in a high-temperature chamber at 80 ° C. for 60 seconds to obtain a surface modified layer having a thickness of 2 ⁇ m.
- a UV-reactive acrylic resin containing a photoinitiator (DIC Corporation: UVT Clear (trade name) NSF-001, containing about 37% by weight of resin component in the product) 0% by weight, alicyclic polyfunctional epoxy resin (Daicel Chemical Industries, Ltd .: Celoxide 3150, epoxy equivalent: 180 g / mol) as thermosetting resin, 9.0% by weight, 2-butanone (MEK) as a diluent solvent 34.5% by weight of a coating liquid C2-1 (resin component concentration 30% by weight) comprising 0.5% by weight of a cationic polymerization initiator (Sanshin Chemical Co., Ltd .: Sun-Aid (trade name) SI-60) as a curing agent %) was prepared.
- DICOM Corporation: UVT Clear (trade name) NSF-001 containing about 37% by weight of resin component in the product
- alicyclic polyfunctional epoxy resin (Daicel Chemical Industries, Ltd .: Celoxide 3150, epoxy equivalent: 180 g
- the obtained coating liquid C2-1 was treated with R.I. D. It apply
- the obtained coating film was dried in a high temperature chamber at 140 ° C. for 60 seconds to obtain a film F2-4 having an IMD layer L2-4 having a thickness of 6 ⁇ m (2 ⁇ m is a surface modified layer) having a surface modified layer. .
- a coating solution C3-1 was prepared in the same manner as in Example 3.
- the obtained coating liquid C3-1 was added to R.I. D. Using a coating rod (# 9) manufactured by Specialties, it was applied on the IMD layer surface of film F2-4.
- the obtained coating film was dried in a high temperature chamber at 140 ° C.
- the film F3-4 has a film configuration in which a base film L0 (PET), a release layer L1, an IMD layer L2-4, and an anchor layer L3-1 are laminated in this order.
- the IMD layer L2-4 is a layer having a surface modification layer.
- Example 6 ⁇ Formation of Film with IMD Layer Containing Surface Modification Component> The surface modification layer was not formed, and in the formation of the IMD layer, the MEK solution of polymer A-1 serving as the surface modification component was added to C2-1 at 1% with respect to the resin component concentration of C2-1.
- a film F3-5 was obtained in the same manner as in Example 5 except that the IMD layer L2-5 was obtained using the added coating liquid C2-4. That is, the film F3-5 has a film configuration in which a base film L0 (PET), a release layer L1, an IMD layer L2-5, and an anchor layer L3-1 are laminated in this order.
- the IMD layer L2-5 is a layer containing a surface modifying component.
- the exposure amount was measured with an illuminometer (UVPF-A1 / PD-365, manufactured by Iwasaki Electric Co., Ltd.). 4) Surface Free Energy Using the contact angle meter “DM500” manufactured by Kyowa Interface Science Co., Ltd., the contact angle on the transfer layer side of the transfer molded product after UV irradiation was measured. Two types of probe liquid, distilled water (for measuring nitrogen and phosphorus, manufactured by Kanto Chemical Co., Inc.) and tricresyl phosphate (99%, manufactured by Tokyo Chemical Industry Co., Ltd.), were used. The surface free energy was calculated according to Uy's theory.
- Pencil hardness measurement The transfer layer side of the UV molded product after UV irradiation was measured according to JIS K5600 using a surface property tester HEIDON Type: 14W (manufactured by Shinto Kagaku Co., Ltd.). . 6) Adhesion test The transfer molded product after UV irradiation was dipped in hot water at 70 ° C. for 30 minutes, dried, and 11 cuts were made on the transfer layer side at 1 mm intervals in the vertical and horizontal directions.
- Example 5 The film in which the IMD layer has a surface modification layer (Example 5) and the film in which the IMD layer contains a surface modification component (Example 6) have Example 3 (the surface modification layer or the surface modification component).
- Example 5 the surface modification layer or the surface modification component.
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Abstract
Description
その中でもIMD(インモールド転写)は、成形、転写後に残フィルムを成形品から剥離するため、IMLで煩雑であったプリフォームやトリミング工程が不要であり、加飾・成形工程の自動化やスピードアップが図れる。また、生産性向上、コストダウンの効果も高く、スケールメリットが求められる大量生産品で強みを発揮する工法である。
そのため、成形品の最表面はIMD層となり、耐久性、耐薬品性および成形性に優れた成形品を得るためにはIMD層の役割が非常に重要となる。
インモールド成形用転写フィルムの製造法としては、フィルム作成時に活性エネルギー線を照射して活性エネルギー線硬化性樹脂を架橋硬化(プレキュア)させる方法があるが、成形時、成形品へのIMD層の追従性が悪く簡単にクラックが発生しやすい。前記クラックの発生を防ぐため、フィルム作成時には活性エネルギー線を照射せず、IMD層を成形品へ転写した後に最表面のIMD層に活性エネルギー線を照射して、活性エネルギー線硬化性樹脂を架橋硬化(アフターキュア)させる方法が広く採用されている。しかし、前記方法では以下に述べる様な問題があった。
また、射出成形時、成形用樹脂等を金型へ射出させる際、金型注入部(ゲート部分)付近のIMD層もしくは印刷層が射出される樹脂によって流れ出す現象(ゲート流れ)も発生することがあった。
また、耐熱層としてアンカー層を設けた場合、前記IMD層に含まれる熱硬化性樹脂を前記アンカー層にも加え、硬化させることで、IMD層/アンカー層の密着性を向上させることも見出した。
さらに、転写後の成形体に活性エネルギー線を照射してIMD層を架橋硬化させることで、相互侵入高分子網目構造(IPN構造)を形成し、最終的に耐溶剤性、耐熱性、耐久性に優れた成形品も得られることを見出し、本発明を完成させた。
なお、「IMD層」とは、インモールド成形後に成形体の最表面に配置される層をいう。
なお、「(xxx層)上に積層される」とは、直接xxx層に積層される場合に限らず、間接的に積層される場合であってもよい。例えば、「IMD層上に積層される層」は、直接IMD層に積層される層に限られず、間接的に積層される(他の層を介して積層される)層も含む。
エポキシ系樹脂は耐熱性、接着性、耐薬品性、メラミン系樹脂は耐熱性、硬度、透明性、ウレタン系樹脂は接着性、低温硬化性に優れており、適宜選択して使用することができる。
図1(a)を参照して、本発明の第1の実施の形態に係るインモールド成形用転写フィルムF10について説明する。なお、図1(a)は多層に構成されたインモールド成形用転写フィルムF10の層構成を説明するものであり、各層の厚みは誇張されている。インモールド成形用転写フィルムF10は、基材としてのフィルム状の基材L0、離型層L1、IMD層L2、アンカー層L3、さらに印刷層L4と接着層L5を備える。
インモールド成形では、接着層L5の一方の面側(図1(a)では接着層L5の上側)に樹脂等が射出成形される。図3に示すように、樹脂等の射出成形後、インモールド成形用転写フィルムF10は、離型層L1とIMD層L2の境界面で分離される。転写層11(IMD層L2/アンカー層L3/印刷層L4/接着層L5)は、樹脂に転写され、残フィルム12(基材L0/離形層L1)は、分離され残される。
基材L0は、インモールド成形用転写フィルムF10製造時の支持体として機能する。基材L0には、フィルム状の高分子樹脂として各種のプラスチックフィルムを用いることができる。プラスチックフィルムの材料としては、例えば、ポリエステル系樹脂、アセテート系樹脂、ポリエーテルスルホン系樹脂、ポリカーボネート系樹脂、ポリアミド系樹脂、ポリイミド系樹脂、ポリオレフィン系樹脂、(メタ)アクリル系樹脂、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂、ポリスチレン系樹脂、ポリビニルアルコール系樹脂、ポリアリレート系樹脂、ポリフェニレンサルファイド系樹脂、環状ポリオレフィン系樹脂等の樹脂が挙げられる。具体的には、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート、トリアセチルセルロース、ポリエーテルスルホン、ポリカーボネート、ポリアリレート、ポリエーテルエーテルケトン等が好ましい。なお、ポリエチレンテレフタレート(PET)およびポリエチレンナフタレートは、機械的強度、寸法安定性、耐熱性、耐薬品性、光学特性等、およびフィルム表面の平滑性やハンドリング性に優れているためより好ましい。ポリカーボネートは、透明性、耐衝撃性、耐熱性、寸法安定性、燃焼性に優れているためより好ましい。価格・入手の容易さをも考慮すると、ポリエチレンテレフタレート(PET)が特に好ましい。
なお、基材L0に離型性能を持たせてもよい。離型性能を持たせることにより、基材L0から転写層11(IMD層L2等)を剥離しやすくすることができ、後述の離型層L1を省略することができる。
離型層L1は、基材L0から転写層11(IMD層L2等)を剥離しやすくするための層である。なお、基材L0が離型性能を有する場合は、離型層L1を省略することができる。離型層L1の材料としては、例えば、メラミン系樹脂、ポリオレフィン系樹脂、エポキシ系樹脂、アミノアルキド樹脂、シリコーン樹脂、フッ素樹脂、アクリル系樹脂、パラフィン樹脂、尿素樹脂、繊維系樹脂等が挙げられる。転写層11との剥離安定性、転写層11への移行性を考慮した場合、メチル化メラミン樹脂、ブチル化メラミン樹脂、メチルエーテル化メラミン樹脂、ブチルエーテル化メラミン樹脂、メチルブチル混合エーテル化メラミン樹脂等のメラミン系樹脂、ポリエチレンやポリプロピレン等のポリオレフィン系樹脂がより好ましい。
塗布液は、前記樹脂および必要に応じて各種添加剤や溶媒を混合することにより得られる。塗布液中の樹脂成分の濃度は、例えば、ウェットコーティング法等の積層方法に応じた粘度に調整して適切に選択することができる。前記濃度は、例えば、5~80重量%が好ましく、より好ましくは、10~60重量%の範囲である。溶媒としては、例えば、メチルイソブチルケトン、メチルエチルケトン、酢酸ブチル、酢酸エチル、トルエン、キシレン、ブタノール、エチレングリコールモノエチルアセテート等を用いることができる。
なお、硬化性樹脂は、塗布液として用いることから、硬化前が液状であることが好ましい。
さらに、ウェットコーティング法を用いることにより、毎分数十メートルのライン速度(例えば約20m/分)で積層できるため、大量に製造でき、生産効率を上げることができる。
IMD層L2は、インモールド成形後の成形体の最表面に配置される層であり、表面保護層として機能する。IMD層L2は、活性エネルギー線硬化性樹脂と熱硬化性樹脂をそれぞれ含んで構成される。
本明細書において、活性エネルギー線とは、活性種を発生する化合物を分解して活性種を発生させることのできるエネルギー線をいう。このような活性エネルギー線としては、可視光、紫外線、赤外線、X線、α線、β線、γ線、電子線などの光エネルギー線が挙げられる。
前記不飽和ポリエステルとしては、無水マレイン酸などの不飽和酸とエチレングリコールなどのジオールとを重縮合させて製造できる。具体的にはフマル酸、マレイン酸、イタコン酸などの重合性不飽和結合を有する多塩基酸またはその無水物を酸成分とし、これとエチレングリコール、プロピレングリコール、ジエチレングリコール、ジプロピレングリコール、1,2-ブタンジオール、1,3-ブタンジオール、1,5-ペンタンジオール、1,6-ヘキサンジオール、2-メチル-1,3-プロパンジオール、2,2-ジメチル-1,3-プロパンジオール、シクロヘキサン-1,4-ジメタノール、ビスフェノールAのエチレンオキサイド付加物、ビスフェノールAのプロピレンオキサイド付加物などの多価アルコールをアルコール成分として反応させ、また、必要に応じてフタル酸、イソフタル酸、テレフタル酸、テトラヒドロフタル酸、アジピン酸、セバシン酸などの重合性不飽和結合を有していない多塩基酸またはその無水物も酸成分として加えて製造されるものが挙げられる。
ポリエステル(メタ)アクリレートの原料として用いられる飽和多塩基酸としては、例えばフタル酸、イソフタル酸、テレフタル酸、テトラヒドロフタル酸、アジピン酸、セバチン酸などの重合性不飽和結合を有していない多塩基酸またはその無水物とフマル酸、マレイン酸、イタコン酸などの重合性不飽和多塩基酸またはその無水物が挙げられる。さらに多価アルコール成分としては、前記不飽和ポリエステルと同様である。
前記ビニルエステルとしては、公知の方法により製造されるものであり、エポキシ樹脂に不飽和一塩基酸、例えばアクリル酸またはメタクリル酸を反応させて得られるエポキシ(メタ)アクリレートが挙げられる。
また、各種エポキシ樹脂をビスフェノール(例えばA型)またはアジピン酸、セバシン酸、ダイマー酸(ハリダイマー270S:ハリマ化成(株))などの二塩基酸で反応させ、可撓性を付与してもよい。
原料としてのエポキシ樹脂としては、ビスフェノールAジグリシジルエーテルおよびその高分子量同族体、ノボラック型グリシジルエーテル類などが挙げられる。
前記ポリイソシアネートとしては、具体的には2,4-トリレンジイソシアネートおよびその異性体、ジフェニルメタンジイソシアネート、ヘキサメチレンジイソシアネート、水添キシリレンジイソシアネート、イソホロンジイソシアネート、キシリレンジイソシアネート、ジシクロヘキシルメタンジイソシアネート、ナフタリンジイソシアネート、トリフェニルメタントリイソシアネート、バーノックD-750、クリスボンNK(商品名:大日本インキ化学工業(株)製)、デスモジュールL(商品名:住友バイエルウレタン(株)製)、コロネートL(商品名:日本ポリウレタン工業(株)製)、タケネートD102(商品名:三井武田ケミカル(株)製)、イソネート143L(商品名:三菱化学(株)製)などが挙げられる。
前記ポリヒドロキシ化合物としては、ポリエステルポリオール、ポリエーテルポリオールなどが挙げられ、具体的にはグリセリン-エチレンオキシド付加物、グリセリン-プロピレンオキシド付加物、グリセリン-テトラヒドロフラン付加物、グリセリン-エチレンオキシド-プロピレンオキシド付加物、トリメチロールプロパン-エチレンオキシド付加物、トリメチロールプロパン-プロピレンオキシド付加物、トリメチロールプロパン-テトラヒドロフラン付加物、トリメチロールプロパン-エチレンオキシド-プロピレンオキシド付加物、ジペンタエリスリトール-エチレンオキシド付加物、ジペンタエリスリトール-プロピレンオキシド付加物、ジペンタエリスリトール-テトラヒドロフラン付加物、ジペンタエリスリトール-エチレンオキシド-プロピレンオキシド付加物などが挙げられる。
前記多価アルコール類としては、具体的には、エチレングリコール、ジエチレングリコール、トリエチレングリコール、ポリエチレングリコール、プロピレングリコール、ジプロピレングリコール、ポリプロピレングリコール、2-メチル-1,3-プロパンジオール、1,3-ブタンジオール、ビスフェノールAとプロピレンオキシドまたはエチレンオキシドとの付加物、1,2,3,4-テトラヒドロキシブタン、グリセリン、トリメチロールプロパン、1,3-ブタンジオール、1,2-シクロヘキサングリコール、1,3-シクロヘキサングリコール、1,4-シクロヘキサングリコール、パラキシレングリコール、ビシクロヘキシル-4,4-ジオール、2,6-デカリングリコール、2,7-デカリングリコールなどが挙げられる。
前記水酸基含有(メタ)アクリル化合物としては、特に限定されるものではないが、水酸基含有(メタ)アクリル酸エステルが好ましく、具体的には、例えば、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、3-ヒドロキシブチル(メタ)アクリレート、ポリエチレングリコールモノ(メタ)アクリレート、ポリプロピレングリコールモノ(メタ)アクリレート、トリス(ヒドロキシエチル)イソシアヌル酸のジ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレートなどが挙げられる。
具体的には、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、多官能エポキシ樹脂、可撓性エポキシ樹脂、臭素化エポキシ樹脂、グリシジルエステル型エポキシ樹脂、高分子型エポキシ樹脂、ビフェニル型エポキシ樹脂等のエポキシ系樹脂、メチル化メラミン樹脂、ブチル化メラミン樹脂、メチルエーテル化メラミン樹脂、ブチルエーテル化メラミン樹脂、メチルブチル混合エーテル化メラミン樹脂等のメラミン系樹脂、イソシアネート基を2個以上持ったポリイソシアネート化合物(O=C=N-R-N=C=O)と、水酸基を2個以上持ったポリオール化合物(HO-R'-OH)、ポリアミン(H2N-R"-NH2)、または水などの活性水素(-NH2,-NH,-CONH-など)を持った化合物などとの反応により得ることができるウレタン系樹脂等が加工適性上好ましい。
エポキシ系樹脂は耐熱性、接着性、耐薬品性、メラミン系樹脂は耐熱性、硬度、透明性、ウレタン系樹脂は接着性、低温硬化性に優れており、適宜選択して使用することができる。
活性エネルギー線硬化性樹脂にUV照射させて用いる場合を説明する。活性エネルギー線硬化性樹脂は、光重合開始剤の存在下でUVを照射して重合させることにより硬化するものが好ましい。光重合開始剤としては、例えば、各種のベンゾイン誘導体、ベンゾフェノン誘導体、フェニルケトン誘導体、オニウム塩光開始剤、有機金属光開始剤、金属塩カチオン光開始剤、光分解性オルガノシラン、潜在性スルホン酸、酸化ホスフィンなどが挙げられる。光重合開始剤の添加量は、活性エネルギー線硬化性樹脂100重量部に対して、1~5重量部とすることが好ましい。
IMD層L2の形成では、加熱により熱硬化性樹脂を硬化させる条件を用いればよい。例えば、通常、80~160℃、好ましくは120~150℃の加熱温度で加熱すればよい。このとき、オーブンを用いた場合には、30~180秒間加熱すればよい。加熱温度が低い場合や、加熱時間が短い場合は溶媒が残存し、熱硬化性樹脂の架橋硬化が不十分の可能性がある。また、加熱温度が高い場合や、加熱時間が長い場合は基材フィルムに熱ウェーブが発生する。樹脂の種類、混合比率に応じて適宜、適正な加工条件を選定することが好ましい。
表面改質層を有するIMD層L2’を形成する場合は、まず、表面改質機能を発現する化合物を主成分とする塗布液を調製し、離型層L1上に塗布し、得られた塗膜を必要に応じて加熱・乾燥し、硬化させる(L2aの形成)。続いて、IMD層L2の塗布液を表面改質層L2a上に塗布し、得られた塗膜を加熱・乾燥し、硬化させる(L2bの形成)。このようにすると、転写時にインモールド成形用転写フィルムから基材L0と離形層L1が剥離して除去されるので、表面側に表面改質層L2aを有するIMD層L2’を形成することができる。
シリコーン化合物としては、BYK-UV3500、BYK-UV-3570(いずれもビックケミー社製)、TEGO Rad2100、2200N、2250、2500、2600、2700(いずれもデグサ社製)、X-22-2445、X-22-2455、X-22-2457、X-22-2458、X-22-2459、X-22-1602、X-22-1603、X-22-1615、X-22-1616、X-22-1618、X-22-1619、X-22-2404、X-22-2474、X-22-174DX、X-22-8201、X-22-2426、X-22-164A、X-22-164C(いずれも信越化学工業(株)製)等を挙げることができる。
フッ素化合物としては、ダイキン工業(株)製のオプツールDAC、オプツールDAC-HP、R-1110、R-1210、R-1240、R-1620、R-1820、R-2020、R-5210、R-5410、R-5610、R-5810、R-7210、R-7310、等を挙げることができる。
さらに、表面改質機能を発現する化合物は、例えば、下記式(I)に示される分子構造を有するフルオロシルセスキオキサン化合物や前記フルオロシルセスキオキサン化合物を含有する重合体(ホモポリマーまたはコポリマー)であってもよい。下記式(I)に示す化合物を用いて重合された重合体は、フッ素系のシリコーン化合物であるため、IMD層L2(L2’)に汚れの付着を低減させる機能を付与することができる。実施例5、6が示すように、実際に、高硬度化を図ることができるとともに、低表面自由エネルギー化により、防汚・耐指紋機能の付与に繋がる撥水・撥油性を向上させることができる。
図1(a)を参照して、アンカー層L3を説明する。アンカー層L3は、IMD層L2と、IMD層L2上に積層される層との密着性を向上させる(接着させる)ための層である。アンカー層L3の材料としては、例えば、フェノール樹脂、アルキド樹脂、メラミン系樹脂、エポキシ系樹脂、尿素樹脂、不飽和ポリエステル樹脂、ウレタン系樹脂、熱硬化性ポリイミドおよびシリコーン樹脂等の熱硬化性樹脂や、塩化ビニル-酢酸ビニル共重合体樹脂、アクリル樹脂、塩化ゴム、ポリアミド樹脂、硝化綿樹脂、ポリアミド樹脂、環状ポリオレフィン系樹脂等の熱可塑性樹脂が挙げられる。
具体的には、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、多官能エポキシ樹脂、可撓性エポキシ樹脂、臭素化エポキシ樹脂、グリシジルエステル型エポキシ樹脂、高分子型エポキシ樹脂、ビフェニル型エポキシ樹脂等のエポキシ樹脂、メチル化メラミン樹脂、ブチル化メラミン樹脂、メチルエーテル化メラミン樹脂、ブチルエーテル化メラミン樹脂、メチルブチル混合エーテル化メラミン樹脂等のメラミン樹脂、イソシアネート基を2個以上持ったポリイソシアネート化合物(O=C=N-R-N=C=O)と、水酸基を2個以上持ったポリオール化合物(HO-R'-OH)、ポリアミン(H2N-R"-NH2)、または水などの活性水素(-NH2,-NH,-CONH-など)を持った化合物などとの反応により得ることができるウレタン樹脂等が加工適性上好ましい。
また、ウレタン系樹脂を用いることにより、熱硬化性を有しながら層の伸縮性を維持することができる。よって、射出成形の際に金型に追従するようなノビ(軟度)を維持することができる。
アンカー層L3の形成には、加熱により熱硬化性樹脂を硬化させる条件を用いればよい。例えば、通常、80~160℃、好ましくは120~150℃の加熱温度で加熱すればよい。このとき、オーブンを用いた場合には、30~180秒間加熱すればよい。加熱温度が低い場合や、加熱時間が短い場合は溶媒が残存し、熱硬化性樹脂の架橋硬化が不十分の可能性ある。また、加熱温度が高い場合や、加熱時間が長い場合は基材フィルムに熱ウェーブが発生する。樹脂の種類、混合比率に応じて適宜、適正な加工条件を選定する。
具体的には、紫外線吸収剤としてベンゾトリアゾール類、ヒドロキシフェニルトリアジン類、ベンゾフェノン類、サリシレート類、シアノアクリレート類、または、トリアジン類等が挙げられる。また、紫外線安定剤として、ヒンダードアミン型光安定剤が挙げられる。さらに酸化防止剤として、フェノール系、硫黄系、リン酸系酸化防止剤が挙げられる。
前記添加剤の添加量は、アンカー層L3を形成する樹脂100重量部に対して、0.01~20重量部とすることが好ましい。
図1(a)を参照して、印刷層L4/接着層L5を説明する。アンカー層L3上には、インモールド成形用転写フィルムF10に絵柄等の加飾を持たせるための印刷層L4、および、インモールド成形時に、射出成形される樹脂等に印刷層L4を接着させるための接着層L5が形成される。
また図1(a)に示すように、基材L0の一方の面(図1(a)では基材L0の下側)に、アンチブロッキングや帯電防止のための保護層L6を備えてもよい。保護層L6が、アンチブロッキング性を備えることにより、フィルムの製造過程において、ロールに巻き取った場合のブロッキングを抑制することができる。また、帯電防止性を備えることにより、フィルムの製造過程において、フィルムをロールから巻きだす際の剥離帯電を抑制することができる。
保護層L6を構成する材料としては、各種無機粒子、有機粒子、4級アンモニウム塩、シロキサン、界面活性剤等を含有するコート剤を用いればよい。
図1(a)および図2を参照して、本発明の第2の実施の形態に係るインモールド成形用転写フィルムの製造方法について説明する。本実施の形態では、離型層L1を積層し、保護層L6を省略する場合を説明している。しかし、基材L0が離型性を有する場合には、離型層L1も省略することができる。まず、基材L0の一方の面に離型層L1をウェットコーティング法により積層し、熱硬化させる。(S01)。次に、離型層L1上にIMD層L2をウェットコーティング法により積層し、熱硬化させる(S02)。次に、IMD層L2上にアンカー層L3をウェットコーティング法により積層し、熱硬化させる(S03)。さらにアンカー層L3上に印刷層L4を積層する(S04)。最後に、印刷層L4上に接着層L5を積層する(S05)。積層は、ウェットコーティング法により行われるため、毎分数十メートルのライン速度(例えば約20m/分)で積層でき、生産効率を上げることができる。工程S01~S03では、ウェットコーティングごとに層を熱硬化させるので、塗布液の混合を避けつつ、各層を確実に形成することができる。なお、熱硬化は、後工程である射出成形に必要なノビを妨げない程度に行なうことが好ましい。
インモールド成形における射出成形では、樹脂がピンゲート(1点)もしくはバルブゲート(1点)で金型内に入り、樹脂が広がることによりインモールド成形体が得られる。射出成形の際、ある程度溶けた樹脂(260℃位)の当たる部分には、熱および圧力がかかる。そのため、その部分の層が流れるゲート流れが生じる。
本願のインモールド成形用転写フィルムでは、IMD層L2の熱硬化およびアンカー層L3の熱硬化により、このゲート流れを抑制する。一方で、IMD層L2は、硬化前の活性エネルギー線硬化性樹脂を含有するため、射出成形に必要な成形性(特に金型への追従性)を維持することができる。
このように、本願のインモールド成形用転写フィルムの製造方法は、成形性、耐熱性、耐久性、さらには、耐ブロッキング性、耐溶剤性の優れたインモールド成形用転写フィルムを得ることができる。
[インモールド成形(射出成形工程S06)]
インモールド成形用転写フィルムの製造方法で製造されたインモールド成形用転写フィルム(IMDフィルムF10)を用いて、射出成形工程S06を説明する。なお、IMDフィルムF10は、保護層L6を有していない。
1.フィルム送り
基材PET側が金型(図3では向かって左側の金型)側になるように、フィルム送り装置からIMDフィルムF10が供給され、金型に固定されたセンサーによって、IMDフィルムF10が所定位置まで誘導される。
2.吸引
IMDフィルムF10をクランプした後吸引し、金型の形状にする。
3.射出成形
金型を閉じ、樹脂を射出成形する。
4.転写
取り出しロボットが進入し、インモールド成形体(成形体13)が固定側より突き出される(転写層が残フィルム12から剥離し、樹脂に転写され、成形体13を構成する)。
[IMD層面の硬化(UV照射工程S07)]
IMD層面に活性エネルギー線を照射して、IMD層中の活性エネルギー線硬化性樹脂を硬化させる。
活性エネルギー線硬化性樹脂を硬化させるためのUV照射による硬化法としては、UVランプ(例えば、高圧水銀ランプ、超高圧水銀ランプ、メタルハライドランプ、ハイパワーメタルハライドランプ)から200~400nmの波長のUVをIMD層に短時間(数秒~数十秒の範囲内)照射すればよい。また、電子線照射による硬化法としては、300keV以下の自己遮蔽型の低エネルギー電子加速器から低エネルギー電子線をIMD層に照射すればよい。
[実施例1]
<離型層の形成>
メラミン系離型コート剤((株)三羽研究所:ATOM BOND(商品名) RP-30、製品中約30重量%の樹脂成分を含む)32.5重量%、希釈溶媒としてトルエン/キシレン/2-ブタノン混合溶媒((株)三羽研究所:ATOM BOND(商品名) R-シンナー)64.9重量%、触媒としてパラトルエンスルホン酸エステル((株)三羽研究所:CP触媒)2.6重量%からなるコーティング液C1(樹脂成分濃度10重量%)を調製した。
得られたコーティング液C1を、R.D.スペシャリティーズ社製コーティングロッド(#6)を用いて、基材フィルムL0である三菱樹脂(株)製ポリエチレンテレフタレートフィルム(厚さ:50μm、G440E)の易接着コート面上に塗布した。
得られた塗膜を、150℃の高温チャンバーで20秒間硬化と同時に乾燥させて、膜厚1μmの離型層L1を有するフィルムF1を得た。
なお、塗膜の膜厚は、(株)ニコン製デジマイクロ「MF-501+カウンタTC-101」にて、塗工面と未塗工面の膜厚を測定し、その膜厚差から算出した。
<IMD層の形成>
活性エネルギー線硬化性樹脂として、光開始剤入りUV反応性アクリル樹脂(DIC(株):UVTクリヤー(商品名) NSF-001、製品中約37重量%の樹脂成分を含む)56.0重量%、熱硬化性樹脂として、脂環型多官能エポキシ樹脂(ダイセル化学工業(株):セロキサイド3150、エポキシ当量:180g/mol)9.0重量%、希釈溶媒として、2-ブタノン(MEK)34.5重量%、硬化剤としてカチオン重合開始剤(三新化学工業(株):サンエイド(商品名) SI-60)0.5重量%からなるコーティング液C2-1(樹脂成分濃度30重量%)を調製した。
得られたコーティング液C2-1を、R.D.スペシャリティーズ社製コーティングロッド(#16)を用いて、フィルムF1の離型層L1面上に塗布した。
得られた塗膜を、140℃の高温チャンバーで60秒間乾燥させ、膜厚4μmのIMD層L2-1を有するフィルムF2-1を得た。
フィルムF2-1は基材フィルムL0(PET)、離型層L1、IMD層L2-1の順に積層されたフィルム構成である。
IMD層の形成において、コーティング液C2-1に代えて、光開始剤入りUV反応性アクリル樹脂(DIC(株):UVTクリヤー(商品名) NSF-001)40.5重量%、脂環型多官能エポキシ樹脂(ダイセル化学工業(株):セロキサイド3150、エポキシ当量:180g/mol)15.0重量%、2-ブタノン(MEK)43.6重量%、カチオン重合開始剤(三新化学工業(株):サンエイド(商品名) SI-60)0.9重量%からなるコーティング液C2-2(樹脂成分濃度30重量%)を使用し、IMD層L2-2を得た以外は実施例1と同様の操作を行い、基材フィルムL0(PET)、離型層L1、IMD層L2-2の順に積層されたフィルムF2-2を得た。
IMD層の形成において、コーティング液C2-1に代えて、光開始剤入りUV反応性アクリル樹脂(DIC(株):UVTクリヤー(商品名) NSF-001)81.0重量%、希釈溶媒として、2-ブタノン(MEK)19.0重量%からなるコーティング液C2-3(樹脂成分濃度30重量%)を使用し、IMD層L2-3を得た以外は実施例1と同様の操作を行い、基材フィルムL0(PET)、離型層L1、IMD層L2-3の順に積層されたフィルムF2-3を得た。すなわち、IMD層L2-3は、熱硬化性樹脂を含有していない。
実施例1~2および比較例1で得られたフィルム(F2-1~F2-3)の物性を下記の方法にて測定した。
1)耐溶剤性試験
UV硬化前のフィルムのIMD層面に2-ブタノン(MEK)および酢酸エチルを滴下し、10分間静置後、キムワイプ(日本製紙クレシア製)で液滴を拭き取り、跡残りの有無を目視にて確認した。
評価基準:○ 跡残りなし、× 跡残りあり
2)ブロッキング試験
UV硬化前のフィルムを100mm×100mmにカットし、4枚重ね合わせ、2kgの分銅を載せ、恒温槽(アズワン製、NDH200)にて40℃、24時間、静置した。24時間後、サンプルを取り出し、IMD層の移行具合の模様跡を目視にて確認した。
評価基準:○ 跡残りなし、× 跡残りあり
3)動的粘弾性試験
UV硬化前のフィルムのIMD層のみを膜として取り出し、粘弾性測定解析装置((株)ユービーエム製、DVE-V4)を用いて、E’(貯蔵弾性率)が顕著に低下する温度領域を測定し、耐熱性の指標とした。
(サンプルサイズ:5mm×10mm、ステップ温度:2℃、昇温速度:5℃/min、基本周波数:10Hz、静荷重制御:自動静荷重、動的応力制御、100g、歪み制御:10μm、0.1%、自動調整、歪み波形:正弦波、加振状態:ストップ加振)
4)クラック発生伸度
UV硬化前のフィルムのIMD層面にアクリル樹脂系粘着テープ(日東電工(株)製、No.31B、テープ幅 25mm)を貼り付けた後、剥がすことで、テープ粘着面にIMD層が転写された試験片(幅25mm×長さ200mm)を作成した。作成した試験片を引張試験機((株)オリエンテック製、テンシロン RTM-250、最大荷重容量2.5kN)にて速度2mm/min、チャック間距離100mmの条件で引っ張り、クラックが入る距離を測定した。
クラック発生伸度は、以下の式から求めた。
(クラック発生距離-チャック間距離)/チャック間距離×100
5)全光線透過率
UV硬化前のフィルムのIMD層のみを膜として取り出し、日本電色工業(株)製ヘーズメーター「NDH5000」を用いて、JIS K7361に基づき、全光線透過率を測定した。
6)ヘーズ
UV硬化前のフィルムのIMD層のみを膜として取り出し、日本電色工業(株)製ヘーズメーター「NDH5000」を用いて、JIS K7136に基づき、ヘーズ値を測定した。
7)表面自由エネルギー
協和界面科学(株)製接触角計「DM500」を用いて、UV硬化前のフィルムのIMD層面の接触角を測定した。プローブ液体は、蒸留水(窒素・りん測定用、関東化学(株)製)とリン酸トリクレシル(99%、東京化成工業(株)製)の2種類の液体を使用し、測定値をKaelble-Uyの理論に従って表面自由エネルギーを算出した。
8)UV照射
実施例1~2および比較例1で得られたフィルムのIMD層面側に、高圧水銀ランプ(H08-L41、定格 160W/cm、岩崎電気(株)製)が付属したコンベア式UV照射装置を用いて、照度200mW/cm2、露光量1000mJ/cm2で紫外線を照射し、紫外線硬化させた皮膜を得た。露光量は、照度計(UVPF-A1/PD-365、岩崎電気(株)製)で測定した。
9)鉛筆硬度測定
前記、UV照射後のフィルムのIMD層側を、表面性試験機 HEIDON Type:14W(新東科学(株)製)を用いて、JIS K5600に準じて測定を行った。
[実施例3]
<アンカー層の形成>
ウレタン樹脂(DIC(株):UCシーラー(商品名) NA-001、製品中約30重量%の樹脂成分を含む)36.8重量%、ウレタン硬化剤(DIC(株):N-1、製品中約40重量%の樹脂成分を含む)7.4重量%、脂環型多官能エポキシ樹脂(ダイセル化学工業(株):セロキサイド3150、エポキシ当量:180g/mol)6.0重量%、2-ブタノン(MEK)49.5重量%、カチオン重合開始剤(三新化学工業(株):サンエイド(商品名) SI-60)0.3重量%からなるコーティング液C3-1(樹脂成分濃度20重量%)を調製した。
得られたコーティング液C3-1を、R.D.スペシャリティーズ社製コーティングロッド(#9)を用いて、フィルムF2-1のIMD層面上に塗布した。
得られた塗膜を、140℃の高温チャンバーで60秒間乾燥させ、膜厚2μmのアンカー層L3-1を有するフィルムF3-1を得た。
フィルムF3-1は、基材フィルムL0(PET)、離型層L1、IMD層L2-1、アンカー層L3-1の順に積層されたフィルム構成である。すなわち、フィルムF3-1は、実施例1のフィルムF2-1上にアンカー層L3-1を積層したフィルムである。
アンカー層の形成において、フィルムF2-1に代えて、フィルムF2-2を使用し、アンカー層L3-1を得た以外は実施例3と同様の操作を行い、基材フィルムL0(PET)、離型層L1、IMD層L2-2、アンカー層L3-1の順に積層されたフィルムF3-2を得た。すなわち、フィルムF3-2は、実施例2のフィルムF2-2上にアンカー層L3-1を積層したフィルムである。
アンカー層の形成において、フィルムF2-1に代えて、フィルムF2-3を使用し、また、コーティング液C3-1に代えて、ウレタン樹脂(DIC(株):UCシーラー(商品名) NA-001)52.6重量%、ウレタン硬化剤(DIC(株):N-1)10.5重量%、2-ブタノン(MEK)36.9重量%からなるコーティング液C3-2(樹脂成分濃度20重量%)を使用しアンカー層L3-2を得た以外は実施例3と同様の操作を行い、基材フィルムL0(PET)、離型層L1、IMD層L2-3、アンカー層L3-2の順に積層されたフィルムF3-3を得た。すなわち、IMD層L2-3は熱硬化性樹脂を含まず、アンカー層L3-2はIMD層L2-3と同一の熱硬化性樹脂を含まない。フィルムF3-3は、比較例1のフィルムF2-3上にアンカー層L3-2を積層したフィルムである。
実施例3~4および比較例2で得られたフィルム(F3-1~F3-3)の物性を試験1と同様の方法にて測定した。
1)耐溶剤性試験
UV硬化前のフィルムのアンカー層面に2-ブタノン(MEK)および酢酸エチルを滴下し、10分間静置後、キムワイプ(日本製紙クレシア製)で液滴を拭き取り、跡残りの有無を目視にて確認した。
評価基準:○ 跡残りなし、× 跡残りあり
2)ブロッキング試験
UV硬化前のフィルムを100mm×100mmにカットし、4枚重ね合わせ、2kgの分銅を載せ、恒温槽(アズワン製、NDH200)にて40℃、24時間、静置した。
24時間後、サンプルを取り出し、アンカー層の移行具合の模様跡を目視にて確認した。
評価基準:○ 跡残りなし、× 跡残りあり
3)動的粘弾性試験
UV硬化前のフィルムのアンカー層とIMD層で構成された膜を取り出し、粘弾性測定解析装置((株)ユービーエム製、DVE-V4)を用いて、E’(貯蔵弾性率)が顕著に低下する温度領域を測定し、耐熱性の指標とした。
(サンプルサイズ;5mm×10mm、ステップ温度;2℃、昇温速度;5℃/min、基本周波数;10Hz、静荷重制御;自動静荷重、動的応力制御、100g、歪み制御;10μm、0.1%、自動調整、歪み波形;正弦波、加振状態;ストップ加振)
4)クラック発生伸度
UV硬化前のフィルムのアンカー層面にアクリル樹脂系粘着テープ(日東電工(株)製、No.31B、テープ幅 25mm)を貼り付けた後、剥がすことで、テープ粘着面に転写層(IMD層+アンカー層)が転写された試験片(幅25mm×長さ200mm)を作成した。作成した試験片を引張試験機((株)オリエンテック製、テンシロン RTM-250、最大荷重容量2.5kN)にて速度2mm/min、チャック間距離100mmの条件で引っ張り、クラックが入る距離を測定した。
クラック発生伸度は、以下の式から求めた。
(クラック発生距離-チャック間距離)/チャック間距離×100
5)全光線透過率
UV硬化前のフィルムのIMD層とアンカー層からなる膜を取り出し、日本電色工業(株)製ヘーズメーター「NDH5000」を用いて、JIS K7361に基づき、全光線透過率を測定した。
6)ヘーズ
UV硬化前のフィルムのIMD層とアンカー層からなる膜を取り出し、日本電色工業(株)製ヘーズメーター「NDH5000」を用いて、JIS K7136に基づき、ヘーズ値を測定した。
7)表面自由エネルギー
協和界面科学(株)製接触角計「DM500」を用いて、UV硬化前のフィルムのアンカー層面の接触角を測定した。プローブ液体は、蒸留水(窒素・りん測定用、関東化学(株)製)とリン酸トリクレシル(99%、東京化成工業(株)製)の2種類の液体を使用し、測定値をKaelble-Uyの理論に従って表面自由エネルギーを算出した。
8)剥離力測定
UV硬化前のフィルムのアンカー層面に市販のセロハンテープ(ニチバン(株)製、セロテープ(登録商標)CT-24、テープ幅24m)を貼り合わせ、2kgの圧着ローラーで1往復圧着し、圧着から30分後のフィルムの離型層とIMD層との剥離力を引張試験機((株)東洋精機製作所製、ストログラフ VES05D、最大荷重容量50N)にて測定した。
なお、剥離力測定値は、チャック間距離100mm、180度の角度で剥離速度300mm/minの条件で求められる剥離に要する力(N)をテープ幅(cm)で割った値(N/cm)とした。
実施例3~4および比較例2で得られたフィルム(F3-1~F3-3)に、下記に示した層を形成した後、射出成形テストを実施した。
1)印刷層および接着層の形成
実施例3~4および比較例2で得られたフィルム(F3-1~F3-3)のアンカー層面側に、#300メッシュの版が取り付けられたバッチ式スクリーン印刷機(MINOMAT-e、(株)ミノグループ製)を用いて、印刷層L4(VIC(Z)710ブラック、(株)セイコーアドバンス製、膜厚4μm)、接着層L5(JT-27ベースクリヤー、(株)セイコーアドバンス製、膜厚2μm)を順次積層させた。
2)射出成形テスト
前記、印刷層L4および接着層L5が塗工されたフィルムをバルブゲートタイプのインモールド成形用テスト金型が取り付けられた射出成形機(IS170 (i5)、東芝機械(株)製)にセットし、PC/ABS樹脂(LUPOY PC/ABS HI5002、LG化学製)を射出成形することで、転写された成形品を得た。
(射出条件:スクリュー径40mm、シリンダー温度250℃、金型温度(固定側、可動側)60℃、射出圧力160MPa(80%)、保圧力100MPa、射出速度60mm/秒(28%)、射出時間4秒、冷却時間20秒)
前記、得られた転写成形品のゲート部、深絞りコーナー部の外観を目視にて確認した。
ゲート部 評価基準:○ 樹脂・インキ流れなし、× 樹脂・インキ流れあり
深絞りコーナー部 評価基準:○ クラック発生なし、× クラック発生あり
3)UV照射
前記、得られた転写成形品の転写層面側に、高圧水銀ランプ(H08-L41、定格 160W/cm、岩崎電気(株)製)が付属したコンベア式UV照射装置を用いて、照度200mW/cm2、露光量1000mJ/cm2で紫外線を照射し、紫外線硬化させた皮膜を得た。露光量は、照度計(UVPF-A1/PD-365、岩崎電気(株)製)で測定した。
4)鉛筆硬度測定
前記、UV照射後の転写成形品の転写層側を、表面性試験機 HEIDON Type:14W(新東科学(株)製)を用いて、JIS K5600に準じて測定を行った。
5)密着性試験
前記、UV照射後の転写成形品を70℃の熱水に30分間浸漬させ、乾燥後、転写層側に1mm間隔で縦横それぞれ11本の切れ目を付け、100個のマス目を作り、市販のセロハンテープ(ニチバン(株)製、セロテープ(登録商標)CT-24、テープ幅24m)をよく密着させ、90度手前方向に急激に剥がした際の、皮膜が剥離せずに残存した碁盤目の個数を表した。なお、この方法はJIS K5400に準拠している。
<重合体A-1の合成>
表面改質機能を発現する化合物(重合体A-1)を合成する。
窒素シールされたリフラックスコンデンサー、温度計、攪拌羽根およびセプタムが装着された四ツ口フラスコ(300ml)に、化学物質A(フルオロシルセスキオキサン化合物)(11.25g)、メチルメタクリレート(MMA、33.75g)および2-ブタノン(MEK、104.41g)を導入した。その後、オイルバスにて加温し、15分間還流させた後、アゾビスイソブチロニトリル(AIBN)/MEK溶液(10重量%、5.8683g)を投入し、重合を開始させた。5時間反応を行った後、AIBN/MEK溶液(10重量%、5.8683g)をさらに添加し、3時間熟成させた。ガスクロマトグラフィーにより、モノマー転化率が飽和に達したところを反応終点とし、目的とする重合体A-1のMEK溶液を得た。得られた重合体A-1のモノマー組成、フッ素濃度:F濃度、重量平均分子量:Mw、多分散指数:Mw/Mnは表4に示す通りであった。重量平均分子量、多分散指数はゲルパーミエーションクロマトグラフィー(GPC、型番:アライアンス2695、ウォーターズ社製、カラム:Shodex GPC KF-804L x 2本(直列)、ガードカラム:KF-G)を用いて測定した。
<離型層の形成>
実施例1と同様の方法で、離型層L1を有するフィルムF1を得た。
<表面改質層を有するIMD層の形成>
まず、重合体A-1のMEK溶液を、R.D.スペシャリティーズ社製コーティングロッド(#6)を用いて、フィルムF1の離型層L1面上に塗布した。
得られた塗膜を、80℃の高温チャンバーで60秒間乾燥させ、膜厚2μmの表面改質層を得た。
次に、活性エネルギー線硬化性樹脂として、光開始剤入りUV反応性アクリル樹脂(DIC(株):UVTクリヤー(商品名) NSF-001、製品中約37重量%の樹脂成分を含む)56.0重量%、熱硬化性樹脂として、脂環型多官能エポキシ樹脂(ダイセル化学工業(株):セロキサイド3150、エポキシ当量:180g/mol)9.0重量%、希釈溶媒として、2-ブタノン(MEK)34.5重量%、硬化剤としてカチオン重合開始剤(三新化学工業(株):サンエイド(商品名) SI-60)0.5重量%からなるコーティング液C2-1(樹脂成分濃度30重量%)を調製した。
得られたコーティング液C2-1を、R.D.スペシャリティーズ社製コーティングロッド(#16)を用いて、表面改質層面上に塗布した。
得られた塗膜を、140℃の高温チャンバーで60秒間乾燥させ、表面改質層を有する膜厚6μm(2μmは表面改質層)のIMD層L2-4を有するフィルムF2-4を得た。
<アンカー層の形成>
実施例3と同様の方法で、コーティング液C3-1を調製した。
得られたコーティング液C3-1を、R.D.スペシャリティーズ社製コーティングロッド(#9)を用いて、フィルムF2-4のIMD層面上に塗布した。
得られた塗膜を、140℃の高温チャンバーで60秒間乾燥させ、膜厚2μmのアンカー層L3-1を有するフィルムF3-4を得た。
すなわち、フィルムF3-4は、基材フィルムL0(PET)、離型層L1、IMD層L2-4、アンカー層L3-1の順に積層されたフィルム構成である。なお、IMD層L2-4は、表面改質層を有する層である。
<表面改質成分を含有するIMD層を備えたフィルムの形成>
表面改質層を形成しなかったこと、また、IMD層の形成において、C2-1に表面改質成分となる重合体A-1のMEK溶液をC2-1の樹脂成分濃度に対して1%添加したコーティング液C2-4を使用し、IMD層L2-5を得た以外は、実施例5と同様の操作を行い、フィルムF3-5を得た。
すなわち、フィルムF3-5は、基材フィルムL0(PET)、離型層L1、IMD層L2-5、アンカー層L3-1の順に積層されたフィルム構成である。なお、IMD層L2-5は、表面改質成分を含む層である。
実施例3、5および6で得られたフィルム(F3-1、F3-4、F3-5)に、下記に示した層を形成した後、射出成形テストを実施した。
1)印刷層および接着層の形成
実施例3、5および6で得られたフィルム(F3-1、F3-4、F3-5)のアンカー層面側に、#300メッシュの版が取り付けられたバッチ式スクリーン印刷機(MINOMAT-e、(株)ミノグループ製)を用いて、印刷層L4(VIC(Z)710ブラック、(株)セイコーアドバンス製、膜厚4μm)、接着層L5(JT-27ベースクリヤー、(株)セイコーアドバンス製、膜厚2μm)を順次積層させた。
2)射出成形テスト
前記、印刷層L4および接着層L5が塗工されたフィルムをバルブゲートタイプのインモールド成形用テスト金型が取り付けられた射出成形機(IS170 (i5)、東芝機械(株)製)にセットし、PC/ABS樹脂(LUPOY PC/ABS HI5002、LG化学製)を射出成形することで、転写された成形品を得た。
(射出条件:スクリュー径40mm、シリンダー温度250℃、金型温度(固定側、可動側)60℃、射出圧力160MPa(80%)、保圧力100MPa、射出速度60mm/秒(28%)、射出時間4秒、冷却時間20秒)
前記、得られた転写成形品のゲート部、深絞りコーナー部の外観を目視にて確認した。
ゲート部 評価基準:○ 樹脂・インキ流れなし、× 樹脂・インキ流れあり
深絞りコーナー部 評価基準:○ クラック発生なし、× クラック発生あり
3)UV照射
前記、得られた転写成形品の転写層面側に、高圧水銀ランプ(H08-L41、定格 160W/cm、岩崎電気(株)製)が付属したコンベア式UV照射装置を用いて、照度200mW/cm2、露光量1000mJ/cm2で紫外線を照射し、紫外線硬化させた皮膜を得た。露光量は、照度計(UVPF-A1/PD-365、岩崎電気(株)製)で測定した。
4)表面自由エネルギー
協和界面科学(株)製接触角計「DM500」を用いて、前記、UV照射後の転写成形品の転写層側の接触角を測定した。プローブ液体は、蒸留水(窒素・りん測定用、関東化学(株)製)とリン酸トリクレシル(99%、東京化成工業(株)製)の2種類の液体を使用し、測定値をKaelble-Uyの理論に従って表面自由エネルギーを算出した。
5)鉛筆硬度測定
前記、UV照射後の転写成形品の転写層側を、表面性試験機 HEIDON Type:14W(新東科学(株)製)を用いて、JIS K5600に準じて測定を行った。
6)密着性試験
前記、UV照射後の転写成形品を70℃の熱水に30分間浸漬させ、乾燥後、転写層側に1mm間隔で縦横それぞれ11本の切れ目を付け、100個のマス目を作り、市販のセロハンテープ(ニチバン(株)製、セロテープ(登録商標)CT-24、テープ幅24m)をよく密着させ、90度手前方向に急激に剥がした際の、皮膜が剥離せずに残存した碁盤目の個数を表した。なお、この方法はJIS K5400に準拠している。
L1 離形層
L2、L2’、L2-1、L2-2、L2-3、L2-4、L2-5 IMD層
L3、L3-1、L3-2 アンカー層
L4 印刷層
L5 接着層
L6 保護層
L7 樹脂
F1、F2-1、F2-2、F2-3、F3-1、F3-2、F3-3、F3-4、F3-5 フィルム
F10 インモールド成形用転写フィルム
11 転写層
12 残フィルム
13 成形体
C1、C2-1、C2-2、C2-3、C2-4、C3-1、C3-2 コーティング液
Claims (11)
- インモールド成形体に転写される転写層であって、転写後に活性エネルギー線を照射することにより硬化する転写層と:
フィルム状の基材とを備え;
前記転写層は、
前記基材上に積層された、インモールド成形後に成形体の最表面に配置されるIMD層を有し;
前記IMD層は、活性エネルギー線硬化性樹脂と熱硬化性樹脂をそれぞれ少なくとも1種類含む混合組成で構成された、
インモールド成形用転写フィルム。 - 前記転写層は、転写前の加熱により前記IMD層に含まれる熱硬化性樹脂が硬化した、
請求項1に記載のインモールド成形用転写フィルム。 - 前記熱硬化性樹脂は、エポキシ系樹脂、メラミン系樹脂、ウレタン系樹脂の少なくともいずれか1種類を含む、
請求項1または請求項2に記載のインモールド成形用転写フィルム。 - 前記IMD層は、表面改質成分を含む、または、前記成形体の表面となる面に表面改質層を有する、
請求項1~請求項3のいずれか1項に記載のインモールド成形用転写フィルム。 - 前記表面改質成分、または、前記表面改質層は、シリコーン化合物、フッ素化合物およびフルオロシルセスキオキサンを含有する化合物から選ばれる1種以上を含む、
請求項4に記載のインモールド成形用転写フィルム。 - 前記転写層は、前記IMD層の前記基材と反対の側に積層され、前記IMD層と前記IMD層上に積層される層との密着性を高める、硬化した熱硬化性樹脂を含有するアンカー層を有し;
前記IMD層と前記アンカー層に含まれる熱硬化性樹脂は、少なくとも1種類が同一の種類である、
請求項1~請求項5のいずれか1項に記載のインモールド成形用転写フィルム。 - 前記転写層は、さらに
前記アンカー層上に積層された印刷層と;
前記印刷層上に積層された接着層とを有する;
請求項6に記載のインモールド成形用転写フィルム。 - 請求項1~請求項7のいずれか1項に記載のインモールド成形用転写フィルムを前記基材側が金型側になるように、前記金型に重ねて配置する工程と;
前記インモールド成形用転写フィルムにインモールド用の樹脂を射出する工程とを備える;
インモールド成形体の製造方法。 - 活性エネルギー線硬化性樹脂と熱硬化性樹脂とをそれぞれ少なくとも1種類混合して、IMD層用樹脂を提供する工程と;
前記IMD層用樹脂をフィルム状の基材上に積層してIMD層を形成する工程と;
前記IMD層用樹脂を加熱して、架橋硬化する加熱工程とを備える;
インモールド成形用転写フィルムの製造方法。 - 前記IMD層の前記基材と反対の側に、前記IMD層と前記IMD層上に積層される層との密着性を高めるアンカー層を積層する工程を備える;
請求項9に記載のインモールド成形用転写フィルムの製造方法。 - 請求項9または請求項10に記載のインモールド成形用転写フィルムの製造方法で製造されたインモールド成形用転写フィルムを前記基材側が金型側になるように前記金型に重ねて配置する工程と;
前記インモールド成形用転写フィルムにインモールド用の樹脂を射出する工程とを備える;
インモールド成形体の製造方法。
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- 2012-06-18 CN CN201811113000.7A patent/CN109719892A/zh active Pending
- 2012-06-18 US US14/127,964 patent/US9375867B2/en not_active Expired - Fee Related
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JP2014117944A (ja) * | 2012-12-19 | 2014-06-30 | Jnc Corp | インモールド成形用転写フィルム、インモールド成形体の製造方法および成形体 |
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JP2014166750A (ja) * | 2013-02-01 | 2014-09-11 | Nof Corp | インモールド成形用反射防止フィルム及びそれを用いた成形物 |
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JP2018192704A (ja) * | 2017-05-17 | 2018-12-06 | 株式会社ダイセル | 転写用フィルム、及びインモールド成型品 |
JPWO2018221405A1 (ja) * | 2017-05-31 | 2020-04-02 | Jnc株式会社 | 積層フィルム |
JP7238772B2 (ja) | 2017-05-31 | 2023-03-14 | Jnc株式会社 | 積層フィルム |
JP2020531311A (ja) * | 2017-08-18 | 2020-11-05 | レオンハード クルツ シュティフトゥング ウント コー. カーゲー | 転写フィルム、フィルムコーティングされた物品の製造方法及びフィルムコーティングされた物品 |
JP7288430B2 (ja) | 2017-08-18 | 2023-06-07 | レオンハード クルツ シュティフトゥング ウント コー. カーゲー | 転写フィルム、フィルムコーティングされた物品の製造方法及びフィルムコーティングされた物品 |
US11679619B2 (en) | 2017-08-18 | 2023-06-20 | Leonhard Kurz Stiftung & Co. Kg | Transfer film, method for producing a film-coated article and film-coated article |
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Also Published As
Publication number | Publication date |
---|---|
KR20190131140A (ko) | 2019-11-25 |
CN103608160A (zh) | 2014-02-26 |
CN109719892A (zh) | 2019-05-07 |
TWI601621B (zh) | 2017-10-11 |
US9375867B2 (en) | 2016-06-28 |
TW201304931A (zh) | 2013-02-01 |
JP6011529B2 (ja) | 2016-10-19 |
KR20140038475A (ko) | 2014-03-28 |
JPWO2012176742A1 (ja) | 2015-02-23 |
US20140113115A1 (en) | 2014-04-24 |
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