KR20100048181A - Transfer film for inmold injection - Google Patents

Abstract

PURPOSE: A transfer film for in-mold injection is provided to express various patterns and luster by additionally including an embo glossy layer in the transfer film including a base, a release layer, a radiation hardening type resin layer, a printing layer, and a bonding layer. CONSTITUTION: A transfer film for in-mold injection comprises a base(1), a release layer(3), a radiation hardening type resin layer(4), a printing layer(5), and a bonding layer(6). The transfer film includes an embo glossy layer(2) additionally. The embo glossy layer is placed between the base and the release layer. The thickness of the embo glossy layer is in a range of 1 ~ 2μm. The embo glossy layer is manufactured using a gravure coating method.

Description

In-mold transfer film {TRANSFER FILM FOR INMOLD INJECTION}

The present invention relates to a transfer film for in-mold injection, and more particularly to an in-mold injection transfer film that can implement a variety of patterns and gloss, including an embossed gloss layer.

Recently, a so-called inmold injection method is widely used to manufacture front panels of various home appliances such as washing machines or air conditioners, or to manufacture LCD windows or keypads for computers and mobile phones.

In-mold injection is injection of molten resin while a transfer film with a predetermined pattern is printed between a fixed mold and a moving mold of an injection mold, and thus transfers 360 ° direction and uneven portion transfer that cannot be overcome by conventional thermal transfer methods. It is possible to, and means that the pattern printed on the transfer film is transferred to the surface of the molding at the same time injection. When the in-mold injection method is applied, conventional injection; Vacuum deposition (base coating, deposition, top coating); adhesion; And the four-step process leading to the attachment of the aluminum name plate can be significantly shortened by only one step process, such as injection and transfer, thereby reducing the manufacturing cost of the injection molding, there is an effect that can significantly reduce the defect rate.

In the in-mold injection process as described above, the transfer film is a material which has a very important influence on the quality of the molded product. The transfer film is usually composed of a base film (or substrate sheet) having a releasability, a protective layer laminated thereon, and a printing layer and an adhesive layer having a predetermined pattern. After the injection process, the protective layer and the print layer is transferred to the molding by the adhesive layer, the base film is separated and removed. At this time, the protective layer is bonded only to the part covering the printing layer on the molding and the remaining part is cut off with the base film.

Reference may be made to the following Documents 1 and 2 as conventional techniques for in-mold injection films.

In Document 1, a method of molding a printed flat film, and injecting a predetermined injection molded product and printing the same on an injection molded product, the method comprising: (A) printing on a back surface of the film in the planar state made of a first material; (B) the printing Molding the formed film into a predetermined shape; (C) injecting a first injection product into the printing surface of the molded film; And (D) removing the film from the injection molded product and transferring the printing surface of the first material to the first injection product.

In Document 2, A) 38-50 micrometers polyethylene terephthalate (PET) film layer; B) Release material layer which consists of an acrylic copolymer (ACRYLIC COPOLYMER), synthetic wax, toluene, methyl ethyl ketone (METHYL ETHYL KETONE); C) a top priming layer composed of polyurethane resin (POLYURETHANE RESIN), modified acrylic resin (MODIFIED ACRYLIC RESIN), silica powder (SILICA POWDER), and methyl ethyl ketone as components; D) a printing layer composed of synthetic resins, synthetic waxes, pigments (PIGMENT), toluene, methyl ethyl ketone, ethyl acetate; And E) an adhesive layer.

Document 1 KR 10-2006-0006033 A 2006.01.19.

Document 2 KR 10-2002-0006248 A 2002.02.04.

Documents 1 and 2 have a great difference in the present invention and configuration in that they do not include an embossed gloss layer.

Conventionally, after forming a release layer, such as silicone on a base material, it manufactured by the method of forming each layer, such as an ionizing radiation-curable resin layer, a decoration layer, and an adhesive bond layer, sequentially.

Such a conventional method can only express the external appearance effect of the glossiness which is the glossiness of a release layer, when shape | molding and transferring simultaneously with injection. Because of this, there was a limitation in forming various patterns and gloss such as a wood pattern, there was a problem that the in-mold film can only be used in a limited limit of the appearance effect.

Therefore, the problem to be solved by the present invention is to provide a transfer film for in-mold injection molding that can implement a variety of patterns and gloss.

The present invention has been made to solve the problems of the prior art as described above,

An in-mold injection transfer film comprising a substrate, a release layer, a radiation-curable resin layer, a print layer, and an adhesive layer, provides an in-mold injection transfer film, characterized in that it further comprises an embossed gloss layer.

In addition, in the present invention, the embossed gloss layer provides a transfer film for in-mold injection, characterized in that included between the substrate and the release layer.

In addition, in the present invention, the embossed gloss layer provides a transfer film for in-mold injection, characterized in that the thickness in the range of 1 ~ 2 ㎛.

In addition, in the present invention, the embossed gloss layer provides an in-mold injection transfer film, characterized in that formed by the gravure coating method.

In addition, in the present invention, the embossed gloss layer provides a transfer film for in-mold injection, characterized in that it comprises a methyl methacrylate resin and a quencher.

In addition, in the present invention, the embossed gloss layer provides a transfer film for in-mold injection, characterized in that it comprises 50 to 80% by weight of methyl methacrylate resin and 20 to 50% by weight of a matting agent.

In addition, in the present invention, the substrate provides a transfer film for injection molding, characterized in that it comprises a polyester or polyvinyl chloride.

In addition, in the present invention, the substrate provides a transfer film for in-mold injection, characterized in that having a thickness in the range of 12 to 50 ㎛.

In addition, in the present invention, the release layer provides a transfer film for in-mold injection, characterized in that it comprises 20 to 70% by weight of melamine-based resin and 10 to 30% by weight of toluensulfonic acid-based curing agent.

In addition, in the present invention, the release layer provides a transfer film for in-mold injection, characterized in that having a thickness in the range of 1 to 2㎛.

In addition, in the present invention, the radiation-curable resin layer provides a transfer film for in-mold injection, characterized in that containing 70 to 90% by weight of urethane acrylic, 10 to 20% by weight of silica and 1 to 3% by weight of an initiator.

In addition, in the present invention, the print layer provides a transfer film for in-mold injection, characterized in that having a thickness within the range of 1 ~ 5 ㎛.

In addition, in the present invention, the adhesive layer provides a transfer film for in-mold injection, characterized in that having a thickness within the range of 1 ~ 5 ㎛.

In-mold injection transfer film according to the present invention has an effect that can implement a variety of patterns and gloss, including the embossed gloss layer.

Hereinafter, the present invention will be described in detail.

The present invention is characterized in that it further comprises an embossed gloss layer in the in-mold injection transfer film comprising a substrate, a release layer, a radiation-curable resin layer, a printing layer and an adhesive layer.

The embossed gloss layer forms a feature of the present invention.

The embossed gloss layer functions to impart various forms of embossing or / and gloss to the radiation curable resin layer.

The embossed gloss layer is a roll of # 120 to # 200 mesh of resin containing 50 to 80 wt% of methyl methacrylate resin and 20 to 50 wt% of matting agent such as PE Wax. It may be formed by applying on the substrate through a gravure coating method using.

The embossed gloss layer preferably has a thickness in the range of 1 to 2 μm. When the coating thickness exceeds the above range, it is difficult to uniformly obtain a coating surface when coating a release layer.

The substrate functions to maintain the shape of the transfer film as a whole.

Preferably, the modified resin is a heat-resistant synthetic resin, and one or two or more mixed resins selected from polyester resins, polypropylene resins, polyamide resins, polyethylene resins, and triacetate resins as examples of such resins. It can be used to consist of.

It is preferable that the thickness of the said base material exists in the range of 12-50 micrometers. When the thickness of the substrate is less than 12, it is difficult to work due to the large film shrinkage rate, and when the thickness of the substrate is greater than 50, curved molding may be difficult during injection molding.

The release layer functions to separate the substrate from the molding after injection molding.

The release layer may be made of one or two or more mixed resins selected from materials such as wax, silicon, Teflon, melamine, urethane, and the like.

In particular, in the present invention, the release layer contains 20 to 70% by weight of the melamine-based resin and 10-30% by weight of the toluene sulfonic acid-based curing agent is added using a microgravure coating method. It is preferably produced by applying to the surface with a thickness of 1 ~ 2㎛.

The thickness of the release layer is preferably formed within the range of 0.5 ~ 2㎛.

The radiation-curable resin layer functions to protect the print layer and the protective layer after the release layer is separated.

The radiation curable resin layer may be formed by curing a composition including an ultraviolet curable resin, a light stabilizer, and an initiator through an ultraviolet irradiation process. As the UV curable resin, oligomers such as urethane acrylate, epoxy acrylate, polyester acrylate, and the like having general refractive index that can easily control physical properties may be used.

In particular, in the present invention, it is preferable to use a composition containing 80 to 85% by weight of urethane acrylic resin, 10 to 20% by weight of silica and 1 to 3% by weight of initiator.

In addition, as the radiation-curable resin layer forming method, various methods such as Nip Coater and Bar Coater can be used without limitation, but in the present invention, it is preferable that the method is a micro gravure coating method.

It is preferable that the thickness of the said radiation curable resin layer exists in the range of 1-5 micrometers. If the thickness is less than 1, the surface hardness is not imparted. If the thickness is greater than 5, there is a possibility that cracks may occur in the curved portion during curved forming.

The printed layer functions to form a predetermined pattern and color.

The print layer is made of acrylic resin, polyurethane resin, melamine resin, polyamide resin and the like, and includes various pigments and dyes as in the conventional transfer film.

In particular, in the present invention, the composition used for forming the printed layer preferably contains 40 to 60% by weight of acrylic resin and 20 to 40% by weight of vinyl chloride copolymer.

The method of forming the printed layer may be used in various ways without limitation, but is preferably formed by a gravure method.

The printing layer can improve the printing effect by adding a stabilizer, anti-broking agent and a matting agent depending on the pattern.

It is preferable that the thickness of the said print layer is 1-5 micrometers.

In the present invention, a metal deposition layer may be formed on the printed layer printing surface to impart various metallic luster, which is also included in the printed layer. The metal deposition layer can be formed of a material such as aluminum, chromium, nickel or silver.

The adhesive layer is made of an acrylic or vinyl adhesive, and serves to attach the transfer film of the present invention to an injection molding. It is preferable that the thickness of the said adhesion layer is 1-2 micrometers.

The adhesive layer is fused to the surface of the workpiece when the transfer film is hot pressed to the surface of the molded product in the transfer printing process. The adhesive layer may be formed by a gravure method using a mixture of polyvinyl chloride and acrylic resin and diluted in an organic solvent.

It is preferable that the said adhesion layer is formed in the thickness of 1-5 micrometers. If the adhesive layer is thick, print flow marks may occur on the window portion of the mobile phone.

Hereinafter, the present invention will be described in detail with reference to Examples. The following examples are only for the detailed description of the invention and are not intended to limit the scope of the rights.

Example

Polyester resin film (brand name: Saehan Toray F99) is used as a base material. Resin comprising 50% by weight of methyl methacrylate-based resin and 50% by weight of polyethylene wax (PE Wax) on the substrate by using a gravure coating method using the # 120 ~ # 200 Mesh Roll 2 micrometers was apply | coated on the phthalate (PET) film, and the embossed glossy layer was formed.

A resin layer containing 70% by weight of the melamine-based resin and 30% by weight of a toluensulfonic acid-based curing agent was applied to the surface of the embossed layer by using a micro coating method to form a release layer.

Radiation-curable resin layer formation was formed by the microcoating method of the composition containing 10-20 weight% of silica and 1-3 weight% of initiators using the urethane acryl monomer as the main solution on the said release layer.

On the radiation curable resin layer, an acrylic resin containing a pigment was applied to a thickness of 1 to 5 μm by a gravure method, and aluminum vacuum deposition was applied thereon to give a metallic luster to form a printed layer.

 Finally, an acrylic adhesive was used, and an adhesive layer having a thickness of 1 μm was formed to complete the transfer film.

Using the transfer film and the acrylic resin, an LCD window for a mobile phone having a curved portion of R 2.5 mm was in-molded at an injection temperature of 250 ° C. and a pressure of 300 kg / cm 2.

Comparative example

The transfer film was manufactured in the same lamination order and structure except that the embossed glossy layer was formed in the above embodiment.

Using the transfer film and the acrylic resin, an LCD window for a mobile phone having a curved portion of R 2.5 mm was in-molded at an injection temperature of 250 ° C. and a pressure of 300 kg / cm 2.

Experimental Example

[Comparison of glossiness]

Glossiness was measured for an LCD molded product in-mold according to the above Examples and Comparative Examples, and the results are shown in Table 1 below.

Glossiness is a value measured using a glossiness meter (TASCO TMS-723).

Glossiness Example 65 Comparative example 42.5

As can be seen in Table 1, when comparing the physical properties of the molded article prepared according to the embodiment of the present invention and the molded article prepared according to the comparative example, the embodiment of the present invention showed excellent properties in the gloss of the protective layer Appeared.

1 illustrates an embodiment of an in-mold injection transfer film of the present invention.

Explanation of symbols on the main parts of the drawings

1: Base material 2: Embossed gloss layer

3: release layer 4: radiation-curable resin layer

5: printed layer 6: adhesive layer

7: In-mold injection film 8: Transparent injection

Claims (13)

An in-mold injection transfer film comprising a substrate, a release layer, a radiation-curable resin layer, a print layer, and an adhesive layer, wherein the in-mold injection transfer film further comprises an embossed gloss layer. The transfer film for in-mold injection molding as claimed in claim 1, wherein the embossed gloss layer is included between the substrate and the release layer. The transfer film for in-mold injection molding as claimed in claim 1, wherein the embossed gloss layer has a thickness within a range of 1 to 2 μm. The transfer film for in-mold injection molding as claimed in claim 1, wherein the embossed gloss layer is formed by a gravure coating method. The transfer film for in-mold injection molding according to any one of claims 1 to 4, wherein the embossed gloss layer comprises methyl methacrylate resin and a quencher. The transfer film for in-mold injection molding according to claim 5, wherein the embossed gloss layer comprises 50 to 80 wt% of methyl methacrylate resin and 20 to 50 wt% of a matting agent. The transfer film for in-mold injection molding as claimed in claim 1, wherein the substrate comprises polyester or polyvinyl chloride. The transfer film for in-mold injection molding as claimed in claim 1, wherein the substrate has a thickness in the range of 12 to 50 μm. The release film of claim 1, wherein the release layer comprises 20 to 70 wt% of a melamine resin and 10 to 30 wt% of a toluensulfonic acid curing agent. The transfer film of claim 1 or 9, wherein the release layer has a thickness within a range of 1 to 2 μm. The transfer film of claim 1, wherein the radiation-curable resin layer comprises 70 to 90 wt% of urethane acrylic, 10 to 20 wt% of silica, and 1 to 3 wt% of an initiator. The transfer film for in-mold injection molding as claimed in claim 1, wherein the printed layer has a thickness within a range of 1 μm to 5 μm. The transfer film for in-mold injection molding as claimed in claim 1, wherein the adhesive layer has a thickness within a range of 1 μm to 5 μm.

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