JP2005292198A - In-mold label and molding using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-mold label and a molding using the same, the abrasion resistance and the counterfeit preventing the features of which are improved by welding, even a substrate film down to the surface of a plastic molding. <P>SOLUTION: A substrate film 11 has a hard coat layer 12 formed on one side thereof and has an ink layer 13, mainly consisting of color hiding ink and an adhesive varnish layer 14 successively laminated to the other surface. A covert gram layer may be provided instead of the ink layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-mold label and a molded product using the in-mold label. In particular, the present invention relates to an in-mold label for an LCD display panel used in a mobile phone, an advanced information terminal, a small LCD camera, or the like that requires security or design. The present invention relates to a mold label and a molded product using the same.

  Conventionally, an in-mold label processing method in which a label that has been subjected to printing and heat-sensitive sealant processing is inserted into a mold for plastic molding, and a label having a printed layer formed on the surface of the molded product is applied at the same time as molding. Is known (see, for example, Patent Document 1).

The said prior art document is shown.
JP, 2004-40365, A (Claim 1) On the other hand, security or design nature is given to various cards using techniques, such as hot stamping and silk screen printing.

  Alternatively, a transfer film (30) in which a release varnish layer (32) / hologram print layer (33) / adhesive varnish layer (34) is sequentially laminated on a base film (31) to which a hologram print layer or the like is added is injection molded. A technique is known in which a printed layer (33) is formed on the surface of a plastic molded article (40) by being inserted into a mold for use and transferred onto the plastic surface simultaneously with injection molding (see FIGS. 3 and 4). .

  In this method, as shown in FIG. 3 and FIG. 4, a release varnish layer (32) which also serves as a protective layer is basically required. The physical property level of the transferred foil or hologram surface is a scratch such as friction. Properties and thermal shock properties (softening and warping in repeated high and low temperature conditions) are naturally limited. The same is true for transparency.

  The present invention has been made in view of the above-described problems relating to the in-mold label used for the LCD display panel member and its molded product. By welding the base film to the surface of the plastic molded product, the friction resistance, It is an object to provide an in-mold label with improved anti-counterfeiting properties and a molded product using the same.

  According to the first aspect of the present invention, a hard coat layer is formed on one side of a base film, and an ink layer mainly composed of color hiding ink and an adhesive varnish layer are sequentially formed on the other side of the base film. It is an in-mold label characterized by being formed by laminating.

  Thus, according to the first aspect of the present invention, the hard coat layer is formed on one side of the base film, and on the other side of the base film, the ink layer mainly composed of color hiding ink and the adhesive varnish Since the layers are sequentially laminated, a metallic feeling that can only be obtained with color hiding inks can be expressed.

  In the invention of claim 2, a hard coat layer is formed on one side of the base film, and a covertgram layer and an adhesive varnish layer are sequentially laminated on the other side of the base film. It is an in-mold label characterized.

  Thus, according to the invention of claim 2, the hard coat layer is formed on one side of the base film, and the covertgram layer and the adhesive varnish layer are sequentially laminated on the other side of the base film. Since it is formed, special ink that can only be determined by the polarizing plate can be printed on the hologram (to make visual discrimination impossible).

  A third aspect of the invention is an in-mold label according to the first or second aspect of the invention, wherein the base film is an unstretched polypropylene film having good visible transparency.

  Thus, according to the invention described in claim 3, by using an unstretched polypropylene film having good visible transmittance as the base film, a polarizing effect can be obtained through the film (the molded product can be made opaque).

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the invention, the adhesive varnish constituting the adhesive varnish layer is a polyurethane resin in which 5 parts of an aromatic isocyanate is kneaded with 95 parts of a polyester resin. An in-mold label comprising:

  Thus, according to invention of Claim 4, since the adhesive varnish which comprises an adhesive varnish layer consists of a polyurethane-type resin which knead | mixed 5 parts of aromatic isocyanates with respect to 95 parts of polyester-type resins, Adhesion is best.

  Further, the invention of claim 5 is the polyurethane resin in which the adhesive varnish constituting the adhesive varnish layer in the invention of claim 1, 2 or 3 is obtained by kneading 10 parts of aliphatic isocyanate with 90 parts of polyester resin. An in-mold label comprising:

  Thus, according to the invention described in claim 5, since the adhesive varnish constituting the adhesive varnish layer is made of a polyurethane resin in which 10 parts of aliphatic isocyanate is kneaded with 90 parts of the polyester resin, Adhesion is best.

  The invention of claim 6 is a plastic molded product in-molded using the in-mold label of claim 1, 2, 3, 4 or 5.

  Thus, according to the sixth aspect of the present invention, the plastic molded product in-molded using the in-mold label is a plastic molded product having excellent friction resistance and thermal shock resistance and transparency.

  As described above, according to the present invention, the in-mold film itself is welded to the surface of the plastic molded product at the time of injection molding, so that the friction resistance and the thermal shock property are remarkably improved as compared with the conventional film insert transfer method.

  The in-mold label of this invention is demonstrated in detail below based on one Embodiment.

  In the in-mold label of the present invention, for example, as shown in FIG. 1, a hard coat layer (12) is formed on one side of a base film (11), and a color hiding ink is formed on the other side of the base film. The ink layer (13) and the adhesive varnish layer (14) are mainly laminated in order.

  As the substrate film (11), a polyethylene terephthalate film, a polycarbonate film, an unstretched polypropylene film, or the like can be suitably used. Pretreatment such as corona discharge treatment may be performed as necessary. The thing of thickness about 75-125 micrometers can be used conveniently.

  The hard coat layer (12) is a layer made of UV / EB curable resin (main structure is polyfunctional acrylic, acrylic functional polymer). More specifically, for example, beam set HC900, beam set HC910 (Arakawa Chemical Industries, Ltd.) Product). It is a layer which apply | coated this resin so that application | coating thickness might be set to about 25-30 micrometers on the single side | surface of a base film (11). This layer has excellent friction and chemical resistance.

  The adhesive varnish layer (14) formed on the ink layer (13) mainly composed of color hiding ink needs to have good adhesion to the plastic molded product (20) described later. A polyurethane resin obtained by kneading 5 parts of an aromatic isocyanate as a curing agent with 95 parts of a certain polyester resin can be preferably used. The coating thickness is preferably about 25 to 30 μm.

  A polyurethane resin obtained by kneading 10 parts of an aliphatic isocyanate as a curing agent with 90 parts of a polyester resin as a medium may be used. Also in this case, the coating thickness is preferably about 25 to 30 μm.

  As the ink layer (13), a covertgram layer (13a) may be provided by a technique such as silk screen printing. The covertgram layer (13a) is a material that changes only to polarized light using the hologram as a blindfold base, and can be discriminated only through the polarizing plate without knowing whether it is printed or not.

  After that, necessary processing such as cutting, small-rise drawing and punching is performed. Depending on the application, a metal deposition layer may be provided or pasta processing may be performed.

  The in-mold label (10, 10a) thus produced is injected, for example, by in-mold molding using, for example, polycarbonate resin or polymethyl methacrylate resin, and the LCD display panel member (20) of a mobile phone is injected. When molding by the molding method, the above-mentioned in-mold label (10, 10a) is inserted into the mold with the surface of the adhesive varnish layer (14) inside, and in-mold at the same time as molding at the resin temperature at the time of injection molding. The labels (10, 10a) are fused to the surface of the LCD display panel member (20).

  The result of the pencil hardness test according to JIS K5400 of this molded product (20) is 3H level when a polyethylene terephthalate film is used as the base film, and 2H level when a polycarbonate film is used as the base film. As an LCD display panel member of this type, it will be sufficiently durable.

  Further, the molded article (20) using the polycarbonate resin satisfies the international standard thermal shock test of 10 cycles of −40 ° C. × 0.5 hr → + 85 ° C. × 0.5 hr.

It is sectional explanatory drawing which shows one Example of the laminated constitution of the in-mold label of this invention. It is a cross-sectional explanatory drawing which shows one Example of the laminated constitution of the plastic molded product which carried out the in-mold shaping | molding using the in-mold label of FIG. It is sectional explanatory drawing which shows another Example of the laminated constitution of the in-mold label of this invention. FIG. 4 is a cross-sectional explanatory view showing an example of a layer structure of a plastic molded product in-molded using the in-mold label of FIG. 3. It is sectional explanatory drawing which shows the layer structure of the transfer film of the conventional film insert transfer method. FIG. 6 is an explanatory cross-sectional view showing a layer structure of a plastic molded product produced by a film insert transfer method using the transfer film of FIG. 5.

Explanation of symbols

10. In-mold label 10a In-mold label 11 Substrate film 12 Hard coat layer 13 Color hiding ink layer 13a Covertgram layer 14 Adhesive varnish layer 20 Plastic molded product 30 Transfer film 31 ... Base film 32 ... Peeling varnish layer 33 ... Hologram printing layer 34 ... Adhesive varnish layer 40 ... Plastic molded product

Claims (6)

  A hard coat layer is formed on one side of the base film, and an ink layer mainly composed of color hiding ink and an adhesive varnish layer are sequentially laminated on the other side of the base film. In-mold label.   An in-mold label characterized in that a hard coat layer is formed on one side of a base film, and a covertgram layer and an adhesive varnish layer are sequentially laminated on the other side of the base film. .   The in-mold label according to claim 1 or 2, wherein an unstretched polypropylene film having good visible transparency is used for the base film.   The in-mold label according to claim 1, 2 or 3, wherein the adhesive varnish constituting the adhesive varnish layer is made of a polyurethane resin in which 5 parts of an aromatic isocyanate is kneaded with 95 parts of a polyester resin. .   The in-mold label according to claim 1, 2 or 3, wherein the adhesive varnish constituting the adhesive varnish layer is made of a polyurethane resin obtained by kneading 10 parts of an aliphatic isocyanate with 90 parts of a polyester resin. .   A plastic molded product obtained by in-mold molding using the in-mold label according to claim 1, 2, 3, 4 or 5.

Images