KR100877183B1 - Frinting film for insert molding - Google Patents

Abstract

A print film for insert molding is provided to reduce the generation of crack even in case of the transfer after injection molding and to improve vapor deposition, printability and surface strength. A print film for insert molding a base film(1); a UV hard coating layer(3) which comprises a silicon dioxide nanoparticle and a siloxane compound and is coated on the base film; a printing primer layer(4) coated on the upper surface of the UV hard coating layer; a printing layer(5) formed on the upper surface of the printing primer layer by partial printing; a vapor deposition layer(7) formed on the upper surface of the printing layer by the vacuum vapor deposition of metal or metal compounds; and an hot-melt adhesive layer(9) coated on the upper surface of the printing primer layer and the vapor deposition layer.

Description

Print Film for Insert Molding {FRINTING FILM FOR INSERT MOLDING}

Figure 1a is a cross-sectional view showing an embodiment of the insert molding printing film according to the present invention.

Figure 1b is a cross-sectional view showing another embodiment of the insert molding printing film according to the present invention.

Figure 1c is a cross-sectional view showing another embodiment of the insert molding printing film according to the present invention.

Figure 2 is a view showing the structural formula of the UV hard coating layer used in the insert molding printing film of Figures 1a to 1c.

Figure 3 is a cross-sectional view showing a release process of the printing film for insert molding of Figure 1c.

Figure 4a to 4c is a cross-sectional view showing another embodiment of the insert molding printing film according to the present invention.

※ Explanation of codes for main parts of drawing

1 Base film 2 Release agent layer

3, 3 ': UV hard coating layer 4: printing primer layer

5: printed layer 6: deposited primer layer

7: deposited layer 8: antioxidant layer

9: hot melt adhesive layer

The present invention relates to a printing film for insert molding, and more specifically, no crack is generated even when transferred simultaneously with injection molding of a molded article through the use of a completely curable and highly flexible resin, and has excellent deposition and printability, The present invention relates to a printing film for insert molding having excellent surface strength.

In general, an in-mold film is used to manufacture keypads or LCD windows installed in various windows and decoration panels, including a name plate of a mobile phone, a washing machine, or a home appliance. The in-mold film forms various printing layers on the back surface of the base film and inserts them into a mold during injection of various products, and is attached to the surface of various panels through press heating and compression.

The method of attaching the in-mold film to the surface of the resin molded article used in the related art as described above is called a molding simultaneous transfer method. That is, in the simultaneous molding method, a transfer film in which a transfer layer composed of a release layer, a print layer, and an adhesive layer is sequentially stacked on a base film is sandwiched in a molding die, and resin is injected into and filled with a cavity. After cooling, a resin molded article is obtained and the in-mold film is adhered to the surface thereof, and then the base film is peeled off, thereby transferring the transfer film onto the resin molded article surface to perform decoration. The in-mold film used in the molding simultaneous transfer method is formed by printing each layer on a long length base film in accordance with the roll width of the printing press, cutting it to an appropriate width in accordance with the size of the transfer object, and transferring the same. do.

However, in the above case, there is a drawback that the slit portion of the in-mold film causes the peeling phenomenon that the surface is peeled off by the chuck that the blade touches upon slit. This is because, between the base film and the transfer layer of the in-mold film, the peelability of not only the portion provided for the transfer but also the portion not provided for the transfer is excellent. The peeling phenomenon is transferred when there are many printed layers as a transfer layer, or when it is necessary to form a deposited layer as a printed layer, when a peeling layer must be thickened like a hard coating in-mold film, or when there are many functional layers. The thicker the layer, the more pronounced it occurs.

As a result, there was a problem that the ink coated piece is again attached to the in-mold film and enters between the transfer object and the transfer layer during transfer, and if the ink coated piece is attached to the back surface of the in-mold film or the transfer is performed simultaneously with the molding, the ink coated piece is There was a problem in that it was adhered to the cavity surface of the mold, and thus, nicks were formed on the surface of the molded article due to ink coating pieces.

On the other hand, as a manufacturing method of a molded article excellent in wear resistance and chemical resistance, conventionally providing a protective printed layer made of an active energy ray-curable resin composition on the emission surface of the base film, a photo printing layer, adhesive printing layer, etc. on the protective printing layer The transfer material obtained by providing an additional layer of the adhesive is adhered on the surface of the molded article, and a protective printed layer made of an active energy ray-curable resin composition is provided on one side without release of the base film or the base film. The surface protection sheet obtained by providing an additional layer, such as a photographic printing layer and an adhesive printing layer, on the other surface, etc. are mentioned.

However, in the method for producing a molded article having excellent wear resistance and chemical resistance, the active energy ray-curable resin composition and the surface protective sheet of the base film such as in-mold film are crosslinked and cured by being irradiated with active energy ray before use (preliminary curing). In this case, when the base film is attached to the molded article, there is a problem that a crack easily occurs in the protective printed layer located on the curved portion of the molded article.

Accordingly, an object of the present invention is a print film for insert molding, which has no cracking, excellent deposition and printability, and excellent surface strength even when transferred simultaneously with injection molding of a molded article through the use of a completely curable and highly flexible resin. In providing.

The above object of the present invention,

Adhesion between the base film, the UV hard coating layer including the silicon dioxide and siloxane compound of the nanoparticles to be coated on the entire surface of the upper surface of the base film to have a predetermined release property, and the UV hard coating layer and the printing layer laminated thereafter A print primer layer formed by being applied to the upper surface of the UV hard coating layer on the whole surface, a print layer formed by partially printing on the upper surface of the print primer layer, and a metal on the upper surface of the print layer. Or it is achieved by providing a printing film for insert molding, characterized in that it comprises a deposition layer formed by vacuum deposition of a metal compound, and a hot melt adhesive layer formed on the printing primer layer and the upper surface of the deposition layer.

According to a preferred feature of the present invention, it further comprises a deposition primer layer is formed between the coating layer and the deposition layer so as to enhance the adhesion of the metal component of the deposition layer.

According to a more preferred feature of the present invention, it further comprises an antioxidant layer formed between the deposition layer and the hot melt adhesive layer to prevent the metal component of the deposition layer is oxidized.

According to a further preferred feature of the invention, the printing primer layer is made of an acrylic polyol or urethane copolymer.

According to a further preferred feature of the invention, the printing primer layer is formed to have a predetermined refractive index with the UV hard coating layer so that the rainbow phenomenon can be improved.

According to a still further preferred feature of the invention, the printed layer comprises 25 parts by weight of pigment, 15 parts by weight of synthetic resin, 5 parts by weight of hardener.

According to a further preferred feature of the invention, the deposition primer layer comprises a curing agent containing 80% by weight of a synthetic resin and urethane copolymer.

According to a further preferred feature of the invention, the antioxidant layer is made of a polyvinyl chloride binder.

In addition, the above object of the present invention,

Between a base film, a release agent layer formed by being coated on the entire surface of the base film, a UV hard coat layer formed by being applied on the entire surface of the release agent layer, and the UV hard coating layer and a printing layer laminated thereafter. A print primer layer which is formed by being coated on the entire surface of the UV hard coating layer so as to enhance adhesion of the UV hard coating layer, a print layer which is formed by partially printing on the top surface of the print primer layer, and an upper surface of the print layer It is also achieved by providing a printing film for insert molding, characterized in that it comprises a deposition layer formed by vacuum deposition of a metal or metal compound, and a hot melt adhesive layer formed on the printing primer layer and the upper surface of the deposition layer. do.

According to a preferred feature of the present invention, it further comprises a deposition primer layer is formed between the coating layer and the deposition layer so as to enhance the adhesion of the metal component of the deposition layer.

According to a more preferred feature of the present invention, it further comprises an antioxidant layer formed between the deposition layer and the hot melt adhesive layer to prevent the metal component of the deposition layer is oxidized.

According to a further preferred feature of the present invention, the release agent layer comprises a melamine resin-based release agent and a curing agent composed of P-toluenesulphonic acid.

According to a still further preferred feature of the invention, the UV hard coating layer comprises an acrylic copolymer, a siloxane compound and a conductive polymer compound.

According to a still further preferred feature of the present invention, the acrylic copolymer, siloxane compound and conductive polymer compound each have 80 to 95 parts by weight, 5 to 20 parts by weight and 0.1 to 10 parts by weight.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this is to describe in detail enough to easily practice the invention having ordinary skill in the art to which the present invention belongs, and this does not mean that the technical spirit and scope of the present invention is limited.

Figure 1a is a cross-sectional view showing an embodiment of the insert molding printing film according to the present invention, Figure 1b is a cross-sectional view showing another embodiment of the insert molding printing film according to the present invention, Figure 1c is an insert according to the present invention Figure 2 is a cross-sectional view showing another embodiment of the printing film for molding, Figure 2 is a view showing the structural formula of the UV hard coating layer used in the insert molding printing film of Figure 1a to Figure 1c, Figure 3 is for the insert molding of Figure 1c It is sectional drawing which shows the release process of a printing film.

Insert molding printing film according to the present invention, as shown in Figure 1a, a base film (1), UV hard coating layer (3), a print primer layer (4), a print layer (5), a deposition layer (7), It comprises a hot melt adhesive layer (9), preferably further comprises a deposition primer layer (6) as shown in Figure 1b, more preferably further comprises an antioxidant layer (8) as shown in Figure 1c. do.

The base film 1 serves as a base material of the insert molding print film to support various coating layers laminated thereon. The base film 1 may be made of PET (polyethylene terephthalate), PC (polycarbonate) or acrylic, etc., preferably made of polyethylene terephthalate. The polyethylene terephthalate has excellent tensile strength and thermal stability, and thus has excellent dimensional stability and excellent durability, and thus has little change in physical properties even after several windings. In addition, the polyethylene terephthalate is not only easy to physical treatment (corona) and chemical treatment (acrylic, urethane) to increase the adhesion of the surface, but also consists of strong bonds and organic solvent binder because of excellent solvent resistance to organic solvents Physical properties are very easy to coat.

In addition, the base film (1) preferably has a thickness of 25㎛ 50㎛. If the thickness of the base film (1) is thinner than 25㎛ may cause cracks due to the weight of the coating layer through a number of processes on the top, when the thickness of the base film (1) thicker than 50㎛ the elongation of the edge of the injection molding during the injection process is This is because not only there is a risk of deformation of the form, but also the feedability (Feeding) is low, there is a possibility of failure occurs, it is more preferable to have a thickness of 36㎛ 38㎛.

The UV hard coating layer 3 is formed on the entire surface of the upper surface of the base film 1, and is a layer exposed to the outside when the base film 1 is peeled off after the transfer of the insert molding printing film. Not only serves to prevent, but also applied to the upper surface of the base film (1) to absorb the UV wavelength band serves to improve the UV weather resistance for the injection after the transfer. The UV hard coating layer 3 comprises a silicon dioxide and siloxane compound of the nanoparticles to have a predetermined release property, as shown in Figure 2 has a structure in which the siloxane compound is bonded to the silicon of the nanoparticles. Therefore, as the UV hard coating layer 3 contains a large amount of silicon components, the UV hard coating layer 3 has a predetermined release property, and as shown in FIG. 3, a separate release agent layer is not formed on the base film 1. If not, the base film 1 and the UV hard coating layer 3 can be easily released. In addition, due to the silicone component contained in the UV hard coat layer 3, the elasticity and flexibility of the UV hard coat layer 3 are increased, thereby making it possible to apply to injection moldings having various bends. In addition, cracks of the cured resin may be generated in the bent portion when the hardness of the general acrylic resin is to be strengthened. However, cracks may be prevented even if the hardness is enhanced by the silicone component contained in the UV hard coating layer 3. have.

The UV hard coating layer 3 is formed by a microgravure coating method, it is preferably formed to have a thickness of 2 to 15㎛, more preferably formed to have a thickness of 4 to 10㎛, 5-9㎛ of It is even more preferred to be formed to have a thickness. When the UV hard coating layer 3 has a thickness of 2 μm or less, the thickness is too thin, so that the physical properties of the UV hard coating layer 3 are difficult to be realized. When the UV hard coating layer 3 has a thickness of 15 μm or more, the UV hard coating layer 3 is too thick. Thereafter, blocking and cracking may occur in a continuous process. In the case where the UV hard coating layer 3 has a thickness of 5 to 9 μm, the rainbow phenomenon may be partially improved. When the UV hard coating layer 3 has a thickness of 5 to 9 μm, the pencil hardness is about 4H. Is above the level.

In addition, the curing of the UV hard coating layer (3) is implemented by a complete curing method by ultraviolet absorption, when uncured or semi-cured method may be mixed with the coating liquid of the printing primer layer (4) to be laminated later This is because, when mixed, it is very likely that the inherent flexibility and hardness of the UV hard coating layer 3 is deteriorated. Therefore, the UV hard coat layer 3 is cured in a completely cured manner by ultraviolet rays, whereby an effect of very high solvent resistance and weather resistance after curing can be obtained.

The printing primer layer (4) is formed by applying the entire surface on the upper surface of the UV hard coating layer (3), and serves to strengthen the adhesive force between the printed layer (5) and the UV hard coating layer (3) to be laminated thereafter. It also serves to improve the absorbency of the ink used in the printed layer (5) to be laminated later. That is, the UV hard coating layer 3 also has the property of absorbing ink but has a disadvantage in that resolution and clarity are somewhat low, so that the printing primer layer 4 is separately formed. The printing primer layer 4 is preferably made of an acrylic polyol or urethane copolymer excellent in ink absorption.

In addition, the printing primer layer 4 is preferably formed to have a predetermined refractive index with the UV hard coating layer 3, which is to improve the Rainbow (RainBow) phenomenon. That is, the UV hard coating layer 3 has a flat outer surface. When the external surface is reflected at an angle, an oil-shaped rainbow phenomenon may occur on the surface, and a printing primer may be used to offset the rainbow phenomenon. The layer is to put a difference in refractive index between (4) and the UV hard coating layer (3). At this time, the difference in refractive index is preferably at least 0.003 or more, and if less than 0.003, the rainbow phenomenon is not improved.

The printing primer layer 4 is coated using a multi-color gravure printing machine, and is preferably formed to have a thickness of about 1.0 μm to 1.5 μm, and the drying is performed at about 100 ° C. for 10 seconds. It is preferable to go through the aging process (24 hours at 40 ℃) after the drying process.

The print layer 5 is partially printed on the upper surface of the print primer layer 4 and serves to represent various designs, characters, or trademarks in various colors. The printing layer 5 preferably comprises 25 parts by weight of pigment, 15 parts by weight of synthetic resin, and 5 parts by weight of a curing agent, and more preferably, the curing agent is made of synthetic resin containing about 40% of a urethane copolymer.

The print layer 5 is formed using a multi-color gravure printing machine, and is operated at a printing frequency determined by the multi-gravure printing machine. In addition, the printed layer 5 is preferably formed to have a thickness of about 1.0㎛ ~ 1.5㎛, drying proceeds for about 10 seconds at about 100 ℃, after the drying process through aging (24 hours at 40 ℃) through Crosslinking is complete.

The deposition layer 7 is formed by vacuum deposition of a metal or metal compound on the upper surface of the printing layer 5. Here, vacuum deposition is a method of forming a thin film by evaporating a metal or a metal compound in a vacuum state, the material that can be used for the deposition is Al, Cu, Cr, Ag, etc., Al is mainly used. The deposition layer 7 is preferably formed to have a thickness of about 0.01 ~ 0.2㎛.

Meanwhile, although the deposition layer 7 may be directly formed on the upper surface of the printing layer 5, the adhesion of the printing layer 5 and the deposition layer 7 may be further enhanced so that the adhesion of the deposition layer 7 may be further enhanced. It is preferable to further include a deposition primer layer 6 which is formed by coating separately therebetween, so as not to remove the deposition layer 7 in a subsequent cleaning process. As shown in FIG. 1B, the deposition primer layer 6 is applied to the upper surface of the printing layer 5 and serves to increase adhesion of metal components in a subsequent deposition process. It should have a property of excellent bonding strength with the metal component to be vacuum deposited, and preferably comprises a curing agent containing 80% by weight of synthetic resin and urethane copolymer. The deposition primer layer 6 is made of a non-polar binder that does not react with the cleaning liquid during the cleaning process, and has excellent adhesion to the deposition agent having a metal component.

The deposition primer layer 6 is coated using a multi-color gravure printing machine, which is operated at a predetermined printing frequency in the multi-gravure printing machine. In addition, the deposition primer layer 6 is preferably formed to have a thickness of about 1.0㎛ ~ 1.5㎛, drying is carried out at about 100 ℃ for 10 seconds, and after the drying process aged (24 hours at 40 ℃) After the crosslinking is completed.

The hot melt adhesive layer 9 serves to increase the adhesion of the injection molding print film and the injection molding, and as illustrated in FIGS. 1A and 1B, the upper portion of the print primer layer 4 and the deposition layer 7 may be formed. It is applied to the surface and formed. Hot melt adhesive layer (9), also known as hot melt adhesive, is a solid material at room temperature without melting or dispersing in a solvent, only melt 100% solids to heat to use as an adhesive, after being applied to the adhered surface in the molten state It is to be bonded by cooling and solidifying by dissipating heat to and around the adherend, and unlike other adhesives, there is no need for drying process, work space is small and the adhesion speed is fast, there is an effect that enables the production line automation and productivity increase. Ethylene-vinyl acetate-based, polyolefin-based, styrene block copolymerization system, polyamide-based, polyester-based, polyurethane-based, etc. may be used as the hot melt adhesive, it is preferable that a polyester-based hot melt adhesive is used. The polyester-based hot melt adhesive is synthesized by reacting terephthalic acid or isophthalic acid with 1,4-butadiol as saturated polyester, and the polyester-based resin may be used without significant modification, but may be mixed with a filler or the like. Such polyester-based hot melt adhesives are excellent in water resistance, chemical resistance, thermal stability, adhesion to nonporous surfaces, oil resistance, and the like.

The hot melt adhesive layer 9 is formed by a microgravure coating method or a multi-color gravure printing web press, and is preferably formed to have a thickness of about 2.0 μm to 3.5 μm, and drying is performed at about 100 ° C. for 30 seconds.

On the other hand, although the oxidation of the deposition layer 7 can be prevented to some extent by the hot melt adhesive layer 9, it is preferable that an additional antioxidant layer 8 is formed separately, as shown in FIG. 1C. ) Is applied to the upper surface of the deposition layer (7) serves to prevent the deposited metal component is oxidized, it is preferable that the antioxidant layer (8) is made of a polyvinyl chloride binder. In the case where the antioxidant layer 8 is formed on the upper surface of the deposition layer 7, the hot melt adhesive layer 9 is formed by being applied to the printing primer layer 4 and the upper surface of the antioxidant layer 8.

The anti-oxidation layer 8 is formed by a micro gravure coating method or a multi-color gravure printing rotary press, and is preferably formed to have a thickness of about 1.0 μm to 1.5 μm, and drying is performed at about 100 ° C. for 30 seconds.

1A to 1C, a process of attaching the insert molding printing film to a molded product such as a mobile phone is briefly described. After the insert molding printing film is adhered to the molded product through the hot melt adhesive layer 9, the base film 1 After peeling off, attachment of the printing film for insert molding is completed. On the other hand, if the insert molding film is attached at the same time as the injection molding, the base film (1) is placed in the lower mold to insert the printing film for the insert molding, lowering the upper mold, and the resin is injected Upon molding, the hot melt adhesive layer 9 of the insert molding printing film is adhered to the molded article simultaneously with the molding. Then, after lifting the upper mold and taking the molded product out of the lower mold, the base film 1 is separated from the UV hard coating layer 3 to complete the process of attaching the insert molding print film.

4A to 4C are cross-sectional views showing still another embodiment of a printing film for insert molding according to the present invention. Insert molding printing film according to the present invention, as shown in Figure 4a, the base film (1), release agent layer (2), UV hard coating layer (3 '), printing primer layer (4), printing layer (5) And a deposition layer 7, a hot melt adhesive layer 9, preferably further comprising a deposition primer layer 6 as shown in FIG. 4b, and more preferably, oxidation as shown in FIG. 4c. The prevention layer 8 is further included. Here, the base film 1, the print primer layer 4, the print layer 5, the deposition primer layer 6, the deposition layer 7, the anti-oxidation layer 8, the hot melt adhesive layer 9 is described above. Since the technical features are the same as in the case of the insert molding printing film of FIGS. 1A to 1C, description thereof will be omitted. Hereinafter, only the release agent layer 2 and the UV hard coating layer 3 ′ will be described.

The release agent layer 2 is applied to the entire upper surface of the base film 1 so that the base film 1 is peeled off after the print film for insert molding is transferred or transferred simultaneously with injection molding. Together with the UV hard coat layer 3 '. That is, when the UV hard coating layer 3 'is directly applied to the base film 1, the base film 1 does not become a base film in the subsequent transfer process due to the adhesion between the base film 1 and the UV hard coating layer 3'. Since there is a problem that does not occur is to form a separate release agent layer (2) on the base film (1), therefore, the base film (1) and the release agent layer (2) is integrated as shown in Figure 4 UV hard It can be easily peeled off from the coating layer 3 '. The release agent layer 2 preferably comprises a melamine resin releasing agent and a curing agent composed of P-toluenesulphonic acid, and in addition to the melamine resin releasing agent, a silicone resin releasing agent, a fluorine resin releasing agent, a cellulose induction releasing agent, and a polyolefin resin releasing agent. And combination mold release agents thereof may be used. In addition, the release agent layer 2 may be made of a mixture of modified siloxane acrylate, modified siloxane acrylate and wax. The release agent layer 2 is formed by a micro gravure (Micro Gravuer) coating method, it is preferably formed to have a thickness of 0.1 ~ 1.0㎛. In addition, the release agent layer (2) is preferably formed by curing for 30 seconds at about 100 ~ 160 ℃ temperature conditions for the melamine react with each other, the curing conditions of the release agent layer made of modified siloxane acrylate is also the same level as above. to be. On the other hand, the release agent layer (2) may be cured in a manner of aging 1-2 days at 40 ~ 60 ℃ to remove the unreacted monomer.

The UV hard coating layer 3 'is formed by coating the entire surface of the upper surface of the release agent layer 2, and when the base film 1 and the release agent layer 2 are peeled off after the transfer of the insert molding printing film. As the exposed layer, not only serves to prevent scratches, but also to absorb the UV wavelength band after being applied to the upper surface of the release agent layer (2) serves to improve the UV weather resistance for the injection molding after the transfer. The UV hard coating layer 3 'comprises an acrylic copolymer and a compound having a siloxane structure, and preferably includes an acrylic copolymer and a silane. The siloxane structure used at this time is generally used having a structure that is connected to the acrylic copolymer and the reactor. Therefore, the UV hard coating layer (3 ') is connected to the Si structure has excellent flexibility, thereby preventing cracking during injection.

In addition, the UV hard coating layer (3 ') preferably further comprises a conductive polymer compound, wherein the acrylic copolymer, the siloxane compound and the conductive polymer compound are 80 to 95 parts by weight, 5 to 20 parts by weight and 0.1 to 10, respectively It is more preferable that it is a weight part. When the siloxane compound is 20 parts by weight or more, the flexibility of the UV hard coating layer 3 'is ensured, so that cracking of the injection molding does not occur, but the hardness of the UV hard coating layer 3' is lowered, resulting in a large amount of scratches due to external impact. When the siloxane compound is 5 parts by weight or less, the hardness of the injection molding is increased, but the flexibility during injection is reduced, causing a large amount of cracking. The conductive polymer compound has a structure that is connected to the acrylic copolymer and the reactor, through which charge can be implemented. Accordingly, chargeability is implemented in the UV hard coating layer 3 ′ exposed to the surface of the injection molded product, thereby preventing foreign matter from being mixed by antistatic and contamination by changing the surface tension and contact angle. When the conductive polymer compound is 10 parts by weight or more, the content of the conductive polymer compound implemented on the surface of the UV hard coating layer 3 'increases, so that the properties of chargeability and contact angle are excellent, but hardness is low. When the conductive polymer compound is less than 0.1 part by weight, it is very difficult to implement chargeability.

Since the coating method and curing method of the UV hard coating layer 3 'is the same as the coating method and curing method of the UV hard coating layer 3 of the above-described insert molding printing film of FIGS. Will be omitted.

The process of attaching the insert molding printing film of FIGS. 4A to 4C to a molded product such as a mobile phone is the same as the process of attaching the insert molding printing film of FIGS. 1A to 1C to a molded product, except that the base film 1 The difference is that only the release agent layer 2 is peeled off from the UV hard coat layer 3.

As described above, according to the insert molding printing film according to the present invention, by using a UV hard coating layer made of nanoparticles of silicon dioxide and siloxane compound, the UV hard coating layer is a fully hardened type, but has high flexibility, and simultaneously transfer molding and transfer. In addition, the occurrence of cracks can be reduced as well as the occurrence of cracks during injection molding can be further reduced by using a highly flexible primer layer and printed layer.

In addition, since a large amount of silicone components are included in the UV hard coating layer, the UV hard coating layer itself has a predetermined release property, and thus the base film and the UV hard coating layer can be easily released without applying a separate release agent layer to the base film. Increased flexibility can be applied to injection moldings with various bends, as well as cracking can be prevented.

In addition, printability and adhesion may be improved by stacking a printing primer layer provided with functionality between the UV hard coating layer and the printing layer.

In addition, the pencil hardness of the UV hard coating layer is superior to about 4H or more, scratch generation can be prevented.

In addition, deposition may be improved by stacking a deposition primer layer on the printed layer.

In addition, by using a material having excellent flexibility in each coating layer applied to the printing film for insert molding, the adhesion to the curved portion of the injection molding can be improved.

In addition, by using a hot melt adhesive layer, there is no drying process, the working space is small and the adhesion speed is high, the production line can be automated as well as productivity can be increased.

Claims (14)

Base film; A UV hard coating layer coated on the entire surface of the base film and including silicon dioxide and siloxane compounds of nanoparticles to have a predetermined release property; A printing primer layer formed on the top surface of the UV hard coating layer so as to enhance adhesion between the UV hard coating layer and the printing layer laminated thereafter; A print layer formed by partially printing on an upper surface of the print primer layer; A deposition layer formed by vacuum deposition of a metal or metal compound on the upper surface of the printing layer; And Print molding film for insert molding comprising a; hot melt adhesive layer is applied to the upper surface of the printing primer layer and the deposition layer. The method of claim 1, Print film for insert molding characterized in that it further comprises a deposition primer layer which is applied between the printed layer and the deposition layer is formed so as to enhance the adhesion of the metal component of the deposition layer. The method of claim 2, Print film for insert molding characterized in that it further comprises an anti-oxidation layer is formed between the deposition layer and the hot melt adhesive layer to prevent the metal component of the deposition layer is oxidized. The method according to any one of claims 1 to 3, The printing primer layer is an insert molding printing film, characterized in that made of an acrylic polyol or urethane copolymer. The method according to any one of claims 1 to 3, The printing primer layer is an insert molding printing film, characterized in that it is formed to have a predetermined refractive index with the UV hard coating layer so that the rainbow phenomenon can be improved. The method according to any one of claims 1 to 3, The printing layer is an insert molding printing film, characterized in that it comprises 25 parts by weight of pigment, 15 parts by weight of synthetic resin, 5 parts by weight of a curing agent. The method according to claim 2 or 3, The deposition primer layer is an insert molding printing film, characterized in that it comprises a curing agent containing 80% by weight of synthetic resin and urethane copolymer. The method of claim 3, The anti-oxidation layer is a printing film for insert molding, characterized in that made of a polyvinyl chloride binder. Base film; A release agent layer formed by being entirely coated on the upper surface of the base film; A UV hard coating layer formed on the entire surface of the release agent layer by coating; A printing primer layer formed on the top surface of the UV hard coating layer so as to enhance adhesion between the UV hard coating layer and the printing layer laminated thereafter; A print layer formed by partially printing on an upper surface of the print primer layer; A deposition layer formed by vacuum deposition of a metal or metal compound on the upper surface of the printing layer; And Print molding film for insert molding comprising a; hot melt adhesive layer is applied to the upper surface of the printing primer layer and the deposition layer. The method of claim 9, Print film for insert molding characterized in that it further comprises a deposition primer layer which is applied between the printed layer and the deposition layer is formed so as to enhance the adhesion of the metal component of the deposition layer. The method of claim 10, Print film for insert molding characterized in that it further comprises an anti-oxidation layer is formed between the deposition layer and the hot melt adhesive layer to prevent the metal component of the deposition layer is oxidized. The method according to any one of claims 9 to 11, The release agent layer is a printing film for insert molding, characterized in that it comprises a melamine resin-based release agent and a curing agent composed of P-toluenesulphonic acid. The method according to any one of claims 9 to 11, The UV hard coating layer is an insert molding printing film comprising an acrylic copolymer, a siloxane compound and a conductive polymer compound. The method of claim 13, The acrylic copolymer, the siloxane compound and the conductive polymer compound are 80 to 95 parts by weight, 5 to 20 parts by weight and 0.1 to 10 parts by weight, respectively.

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