JP2011126086A - Decorative sheet with invisible pattern becoming visible with time - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cause the appearance of a decorative layer formed on the surface of a product by using a decorative sheet to change with time to prevent consumer's getting bored with the appearance of the produce throughout the useful life longevity. <P>SOLUTION: The decorative sheet has a decorative layer fixable to a target product on the surface of a substrate sheet. The decorative layer has a pattern layer and a coloring layer. The pattern layer is superimposed on the coloring layer and arranged outside the coloring layer. The pattern layer is transparent and invisible when the decorative layer is fixed to the target product, and then, a pattern corresponding to the shape of the pattern layer becomes visible with time when a part of the coloring layer not superimposed on the pattern fades selectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a decorative sheet suitable for decorating the surface of an injection-molded body, and more particularly to a decorative sheet that forms a pattern that is invisible at first but becomes apparent over time on an object to be decorated.

  A method for protecting or decorating the surface of an article such as a plastic part or an exterior product using a decorative sheet has been known. For example, in Patent Document 1, a decorative sheet in which a decorative layer is provided on one side of a base sheet that is a support, and this decorative sheet are inserted into an injection mold, and in-mold injection molding is performed. And obtaining a decorated injection-molded body (simultaneous injection molding) is described.

  The decorative layer is generally a laminate in which a pattern, a colorant, an adhesive, and the like are laminated in layers. After being attached to the surface of the article, the decorative layer forms a coating having a decorative function or a protective function. Layers such as a pattern and a colorant are formed by sequentially printing or coating a printing ink such as gravure ink or a coating on a base sheet.

  The colors and patterns imparted to the surfaces of various products by the decorative layer improve the aesthetics, stimulate consumers' willingness to purchase, and satisfy their tastes. In particular, products with mature functions are devised in appearance to differentiate them from other companies. Designs that satisfy consumer preferences may promote product sales and may become a social phenomenon.

  However, once purchased, consumers will see the product on a daily basis. Therefore, consumers get used to product design and get bored as time passes. In other words, even a design that once satisfied consumer preferences will become obsolete over time. As a result, consumers have a desire for new designs.

  Depending on the type of product, the product after sale is colored or decorated as needed to change the appearance in response to the consumer's desire. However, individually changing the appearance of the product after sales is complicated and requires manual work, which is disadvantageous economically.

  Alternatively, product remodeling is usually done every few years to satisfy consumers' desire for new designs. However, if the replacement cycle of the industrial product is shortened in this way, the industrial product with the remaining useful life is discarded or overproduction of the industrial product is promoted, and there are problems such as adverse effects on the environment and waste of resources. It has occurred.

WO01 / 92006

  The present invention solves the above-mentioned conventional problems, and its purpose is to change the appearance of the decorative layer formed on the surface of the product using a decorative sheet over time, and to improve the service life. The goal is to prevent consumers from getting bored with the appearance of the product.

The present invention is a decorative sheet having a decorative layer that can be fixed to an object to be decorated on the surface of a base sheet,
The decorative layer has a pattern layer and a colored layer,
The pattern layer overlaps with the colored layer and is arranged outside the colored layer.
The pattern layer is transparent, and is invisible when the decoration layer is fixed to the object to be decorated, but then the shape of the pattern layer is formed by selectively fading a portion that does not overlap with the pattern of the coloring layer. The pattern corresponding to
Provide a decorative sheet.

  In one certain form, the said pattern layer has ultraviolet absorptivity, and the said colored layer has ultraviolet fading.

  In one certain form, the period from the time when the decorative layer is fixed to the object to be decorated until the pattern of the pattern layer becomes apparent is shorter than about 1/3 of the service life of the decorated product. is there.

  In one certain form, the coloring agent contained in the said colored layer is a ultraviolet-ray fading dye.

  In one certain form, the said ultraviolet-ray fadeable dye has 50-150 hours ultraviolet-ray resistance in the exposure test by JIS: K 7350-2.

  In one certain form, the said ultraviolet-ray fading dye is a 1: 2 chromium complex type | system | group dye.

Further, the present invention is a step of feeding any one of the above decorative sheets into the molding die in such a direction that the pattern layer side of the decorative layer faces the mold cavity surface;
Closing the mold and filling the mold cavity with the molten resin so that the molten resin contacts the inner surface of the decorative sheet (colored layer side of the decorative layer); and cooling the resin and mold Opening the injection mold and removing the injection molded body;
A method of decorating the surface of an injection molded body including

Further, the present invention is a decorated article having a decoration layer fixed to an object to be decorated,
The decorative layer has a colored layer and a pattern layer,
The pattern layer overlaps with the colored layer and is arranged outside the colored layer.
The pattern layer is transparent, and is invisible when the decoration layer is fixed to the object to be decorated. The pattern corresponding to
Provide decorated items.

In this specification, the wording is used according to the definition described below.
“Fixed” refers to attaching so that it is substantially impossible to detach. The decoration layer may be directly fixed to the object to be decorated, or may be fixed by interposing an adhesive layer or a base sheet.
“Picture layer” refers to a layer showing characters or pictures.
“Colored layer” refers to a colored layer.
“Realization” means that the presence of a pattern can be recognized. It is not necessary to see all or every detail of the picture clearly.
The “decorated object” refers to an independent article to be decorated using the decorative sheet of the present invention. For example, injection-molded bodies, injection-molded parts and the like correspond to objects to be decorated.
The “decorated article” refers to an article having the decoration layer of the present invention on the surface of an object to be decorated. When the decorated article is a part, a finished product obtained by assembling the part is referred to as a “decorated product”. That is, “decorated product” refers to a finished product having the decorative layer of the present invention on the surface.

  The decorative layer formed on the surface of the object to be decorated from the decorative sheet of the present invention has an appearance that changes over time and prevents the consumer from getting bored with the appearance of the decorated article during its useful life. . As a result, discarding of products with remaining useful lives and excessive production are suppressed, and adverse effects on the environment are reduced.

It is sectional drawing which shows the structure of the decorating sheet which is embodiment of this invention. It is sectional drawing which shows typically the state in which the pattern corresponding to the shape of a pattern layer becomes apparent in the colored layer of the decoration layer of this invention. It is sectional drawing which shows the structure of the decorated article | item which is one Embodiment of this invention. It is sectional drawing which shows the structure of the decorated article | item which is other embodiment of this invention. It is sectional drawing which shows the structure of the decorated article | item which is other embodiment of this invention. It is sectional drawing which shows the structure of the intermediate | middle decorative article formed in the process of manufacturing the decorated article shown in FIG. It is a perspective view which shows typically the state from which the external appearance of the decorated product which is embodiment of this invention changes.

Decorating Sheet FIG. 1 is a cross-sectional view showing the structure of a decorating sheet that is an embodiment of the present invention. A decorative layer 2 is provided in contact with one surface of the base sheet 1. In this specification, about the layer composition of a decoration sheet, the side of a to-be-decorated object is called inner side, and the viewer's side is called the outside.

  In the embodiment shown in FIG. 1A, the decorative layer 2 has a pattern layer 3, a colored layer 4 and an adhesive layer 5 laminated on one side of the base sheet.

  In the embodiment shown in FIG. 1B, the decorative layer 2 has a colored layer 4 and a picture layer 3 laminated on one side of the base sheet. An adhesive layer 5 is formed on the surface of the base sheet opposite to the decorative layer 2.

  Since the configuration of the decorative layer of the present invention is considered to be a laminate of a picture layer and a colored layer, one side of the decorative layer is the picture layer side and the opposite side is specified as the colored layer side. When viewed as a decorative sheet, there is a surface seen by the viewer on the pattern layer side. That is, the pattern layer side is the outside. Moreover, the surface fixed to a to-be-decorated object exists in the colored layer side. That is, the colored layer side is the inside.

  Of the layers constituting the decorative layer, each resin layer can be formed by the same method as before unless otherwise specified. Examples of conventional layer forming methods include coating methods such as gravure coating, roll coating, and comma coating, printing methods such as gravure printing, and screen printing.

Substrate sheet The substrate sheet 1 is composed of a sheet material or a film material conventionally used for supporting a picture layer or a colored layer on a sheet. Film material refers to a sheet material made of synthetic resin. As the synthetic resin, polypropylene resin, polyethylene resin, polyamide resin, polyester resin, acrylic resin, polyvinyl chloride resin and the like can be used.

  In some cases, the base sheet is peeled off from the decoration layer after performing the injection molding simultaneous decoration, and may remain after being subjected to the simultaneous injection molding decoration.

  In the case where the base sheet is peeled off from the injection-molded body leaving the decorative layer after the simultaneous injection molding, the base sheet is preferably thin and excellent in toughness. As the base sheet, for example, a stretched polyester resin film is preferable.

  In the case of such a material, the thickness of the base sheet is preferably 10 to 100 μm, preferably 20 to 80 μm, more preferably about 30 to 70 μm. If the thickness of the base sheet is less than 10 μm, the strength is insufficient and may be damaged when performing simultaneous injection molding, and if it exceeds 100 μm, the followability to the three-dimensional shape of the decorative sheet may be reduced. .

  Even after the simultaneous injection molding, if the base sheet remains adhered to the decorative layer, the base sheet is preferably excellent in heat stretchability. This is because the followability to the three-dimensional shape of the decorative sheet is improved. As the base sheet, for example, an acrylic resin film, a polycarbonate resin film, a polycarbonate resin / polyester resin alloy film, and the like are preferable.

  In the case of such a material, the thickness of the base sheet is preferably 70 to 200 μm, preferably 80 to 160 μm, more preferably about 90 to 140 μm. If the thickness of the base sheet is less than 70 μm, the strength is insufficient, and there is a risk of damage when performing simultaneous injection molding, and if it exceeds 200 μm, the heat of the injection resin will not easily escape to the mold and ink flow will occur. It becomes easy.

The decorative layer decorative layer 2 is provided on the surface of the base sheet. The decorative layer may be provided on one side or both sides of the base sheet. The decorative layer has at least a colored layer 4 and a pattern layer 3. A plurality of colored layers may be formed by laminating and may be formed on a part of the sheet surface. A plurality of pattern layers may be formed by laminating. Moreover, the decoration layer 2 is a release layer (non-display), a hard-coat layer (non-display) or an anchor layer (non-display) between the base sheet 1 and the pattern layer 3 and the colored layer 4, if necessary. Further, an additional pattern layer (not shown), an additional anchor layer (not shown) or an adhesive layer 5 may be provided adjacent to the exposed surface of the colored layer 4.

  When the base sheet 1 is peeled off from the injection-molded body leaving the decorative layer 2 after the simultaneous injection molding, the decorative layer 2 needs to have releasability from the base sheet 1. In such a case, a release layer (not shown) is formed between the base sheet 1 and the pattern layer 3 and the colored layer 4 so as to be in contact with the base sheet 1.

  The release layer may be separated from the decorative layer together with the base sheet at the time of transfer, or may be separated from the base sheet to form the outermost surface of the decorative layer. As the material of the release layer, melamine resin, silicone resin, fluorine resin, cellulose derivative, urea resin, polyolefin resin, paraffin resin, and composites thereof can be used.

  The adhesive layer 5 is provided on the surface closest to the object to be decorated of the decorating sheet, for example, an injection molded body, as necessary. An adhesive layer adheres a decoration layer and an injection molded object at the time of injection molding simultaneous decoration. As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for an injection-molded product is appropriately used. For example, when the material of the injection molded body is an acrylic resin, an acrylic resin may be used.

  In addition, when the material of the injection-molded product is polyphenylene oxide / polystyrene resin, polycarbonate resin, styrene copolymer resin, or polystyrene blend resin, acrylic resin, polystyrene resin, polyamide having affinity with these resins A series resin or the like may be used. Furthermore, when the material of the injection-molded product is polypropylene resin, chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, and coumarone indene resin can be used.

The pattern layer The pattern layer 3 is a layer for decorating the object to be decorated using characters or patterns. The pattern layer is formed, for example, by spreading ink or paint containing a synthetic resin as a binder and a colorant on the surface of a layer adjacent to the pattern layer such as the base sheet 1. When a release layer, a hard coat layer, an anchor layer or the like is formed on the surface of the base sheet 1, the ink or paint is spread on the surface of these layers.

  Examples of the method for spreading ink or paint include printing methods such as gravure printing, flexographic printing, and screen printing; and gravure coater, gravure reverse coater, flexo coater, blanket coater, roll coater, knife coater, air knife coater, kiss Coating methods such as a touch coater, a kiss touch reverse coater, a comma coater, a comma reverse coater, and a micro gravure coater can be used.

  Synthetic resins that serve as binders in the pattern layer include polyvinyl resins, polyamide resins, polyester resins, acrylic resins, polyurethane resins, polyvinyl acetal resins, polyester urethane resins, cellulose ester resins, alkyd resins, and chlorides. At least selected from the group consisting of vinyl vinyl acetate copolymer resins, thermoplastic urethane resins, methacrylic resins, acrylic ester resins, chlorinated rubber resins, polyethylene chloride resins, and chlorinated polypropylene resins One synthetic resin is preferred.

  As the colorant for the pattern layer, an ultraviolet absorber is used. The pattern does not become transparent when a normal colorant that absorbs visible light is used. Moreover, the ultraviolet absorber used can be contained in an ink or a coating material, and is a kind which can form a transparent picture layer.

  The ultraviolet absorber is preferably one that has a high effect of suppressing the colorant contained in the colored layer from fading over time in the portion of the colored layer overlapping the pattern. That is, when the colorant contained in the colored layer has an absorption peak or absorption band in the ultraviolet region, the ultraviolet absorber includes the absorption peak or absorption band of the colorant and can absorb ultraviolet rays in a wider wavelength region. preferable.

  Generally preferable ultraviolet absorbers have an ultraviolet absorption wavelength of, for example, 230 to 350 nm.

  Specific examples of preferable ultraviolet absorbers include “RSA-0124” (trade name) manufactured by Shannan Synthetic Chemical Co., Ltd.

  The thickness of the pattern layer is preferably 2 μm to 10 μm. If the thickness of the pattern layer is less than 2 μm, the ultraviolet absorption effect is insufficient, making it difficult for the pattern to become apparent, and if it exceeds 10 μm, it is difficult to form a print.

The colored layer colored layer 4 is a layer for concealing the ground color of the object to be decorated and coloring the object to be decorated. The colored layer 4 needs to be discolored or faded by the action of ultraviolet rays contained in ambient light such as sunlight. This is because if the colored layer functions in such a manner, a pattern corresponding to the shape of the pattern layer becomes apparent with time under normal use conditions where light is irradiated.

  The period from when the decoration layer is fixed to the object to be decorated until the pattern corresponding to the shape of the pattern layer becomes apparent must be shorter than the service life of the decorated product. This is because even if the appearance changes after the decorated product itself can no longer be used, the effect of extending the period of use of the product cannot be expected from the consumer. The period until the pattern of the pattern layer becomes apparent may be appropriately determined in consideration of the type of the decorated product. For example, about 2/3 of the useful life of the decorated product, about 1 / 2 or a period shorter than about 1/3.

  Examples of decorated products include mobile phones, notebook computers, media players, televisions, refrigerators, and calculators. When the decorated product is a mobile phone, the useful life is assumed to be about 1 to 3 years, for example.

  The colored layer needs to partially receive the light that has passed through the pattern layer, and is disposed inside the pattern layer. The colored layer need not be in contact with the pattern layer.

  The components and forming method of the colored layer are the same as those of the pattern layer except that the kind and amount of the colorant are changed. For example, the colored layer is formed by spreading ink or paint on the surface of an adjacent layer on the base sheet side, for example, a pattern layer or a base sheet. When an anchor layer or the like is formed between the pattern layer and the colored layer, the ink or paint is spread on the surface of these layers.

  The colorant for the colored layer is appropriately selected according to the service life of the decorated product, so long as it exhibits a color fading property that can realize the function of revealing the pattern corresponding to the shape of the pattern layer. For example, dyes are preferred because they have lower UV resistance than pigments and exhibit substantially fading (UV fading) in an environment that absorbs UV rays.

  For example, if the decorated product has a useful life of 1 to 3 years, the preferred colorant is JIS: K 7350-2 plastic-laboratory light source exposure, which corresponds to an outdoor exposure of 4 months to 1 year. Test Part 2: An ultraviolet ray resistance of 50 to 150 hours in an exposure test using a xenon arc light source. Specific examples of such a colorant include ORASOL manufactured by Ciba and the like containing a 1: 2 chromium complex dye.

  The thickness of the colored layer is preferably 2 μm to 10 μm. When the thickness of the colored layer is less than 2 μm, it is difficult to conceal the base, and when it exceeds 10 μm, it is difficult to form a print.

  FIG. 2 is a cross-sectional view schematically showing a state in which a pattern corresponding to the shape of the pattern layer becomes apparent over time in the colored layer of the decorative layer of the present invention. The decorative layer 2 is fixed to the object to be decorated 9 and has a pattern layer 3, a colored layer 4, and an adhesive layer 5. The pattern layer 3 contains a UV absorber and is transparent. The colored layer 4 overlaps with the pattern layer 3 and is disposed at a position closer to the object to be decorated 9 than the pattern layer.

  Fig.2 (a) has shown the state when a decoration layer is fixed to the to-be-decorated object. At this time, the colored layer 4 is not substantially subjected to ultraviolet rays, and the color at the time of forming the colored layer is maintained throughout the layer. Therefore, the viewer cannot recognize the presence of the pattern layer 3.

  FIG. 2 (b) shows the state when a predetermined time has passed, for example, about 1/2 of the service life of the decorated product under normal use conditions where light is irradiated. Show. At this time, a portion of the colored layer 4 that overlaps with the pattern layer 3 (overlap portion 7) receives a small amount of ultraviolet light, and a portion that does not overlap with the pattern layer 3 (exposed portion 6) receives ultraviolet light. Large amount. Therefore, the color at the time of forming the colored layer is maintained for the overlapping portion 7, and the color is changed or faded for the exposed portion 6. As a result, a pattern corresponding to the shape of the pattern layer 3 is manifested in the colored layer 4, and the viewer can recognize the pattern.

  When the pattern corresponding to the shape of the pattern layer 3 becomes obvious, the colored layer 4 may be discolored or faded to such an extent that the viewer can recognize the presence of the pattern even if the viewer cannot recognize all or details of the pattern. It's enough. In that case, the colored layer 4 is then further discolored or faded, preferably allowing the viewer to recognize all or details of the picture by the useful life of the decorated product.

Article decoration method Articles can be decorated by hot roll transfer or in-mold molding using the decorative sheet of the present invention. For example, in hot roll transfer, the surface of the decorative sheet (that is, the colored layer side of the decorative layer) is superimposed on the surface of the object to be decorated, and a transfer machine such as a roll transfer machine or an up-down transfer machine is used. Heat and pressure are applied from the outside of the decorative sheet (that is, the pattern layer side of the decorative layer). By doing so, the decorative sheet adheres to the surface of the object to be decorated, and the surface of the article is decorated.

  In in-mold injection molding, first, a decorative sheet is fed into a molding die. At that time, the decorative sheet is oriented so that the pattern layer side of the decorative layer faces the mold cavity surface.

  Next, the mold is closed so that the molten resin is in contact with the inner surface of the decorative sheet (that is, the colored layer side of the decorative layer), that is, the decorative sheet is sandwiched between the molten resin and the mold cavity surface. Then, the molten resin is filled in the cavity of the mold. As a result, the molten resin is molded, and at the same time, the decorative sheet is bonded to the surface of the injection molded body. When the resin is cooled, the mold is opened, and the injection molded body is taken out, the decorative layer is adhered to the surface of the injection molded body, and the surface of the injection molded body is decorated.

  When a release layer is formed between the base sheet and the decorative layer, the base sheet is finally peeled off.

The decorating method of the decorated article the article, the decorative article comprising a decorative layer of the present invention secured to the decorated product is obtained. FIG. 3 is a cross-sectional view showing the structure of a decorated article according to an embodiment of the present invention. In the decorated article, the decoration layer 2 is fixed to the object to be decorated 9.

  FIG. 3 (a) shows an article formed when the outermost layer is the pattern layer 3 and the base sheet is peeled after the simultaneous injection molding. FIG. 3B shows an article formed when the outermost sheet is the base sheet 1 and the base sheet is not peeled after the simultaneous injection molding. FIG. 3C shows an article in which the decoration layer 2 is fixed to the object to be decorated 9 through the base sheet 1 and the adhesive layer 5.

  FIG. 4 is a sectional view showing the structure of a decorated article according to another embodiment of the present invention. In this decorated article, the decorative layer 2 is fixed to the inner surface of the transparent object 9 and the decorative layer 2 ′ is fixed to the outer surface. The decorative layer 2 has a colored layer 4 and an adhesive layer 5, and the decorative layer 2 ′ has a pattern layer 3 and an adhesive layer 5 ′. FIG. 4A shows an article formed when the innermost sheet is the base sheet 1 and the outermost side is the base sheet 1 ', and the base sheet is not peeled after the simultaneous injection molding. FIG. 4B shows an article formed when the innermost sheet is the colored layer 4 and the outermost pattern is the pattern layer 3 and the base sheet is peeled off after simultaneous injection molding. A method of decorating both surfaces using a decorative sheet simultaneously with injection molding of a molding resin is known, and is described, for example, in JP-A-2005-262872.

  FIG. 5 is a sectional view showing the structure of a decorated article according to another embodiment of the present invention. In this decorated article, the decoration layer 2, the transparent substrate sheet 1, the transparent decoration object 9 ′, the decoration layer 2 ′, and the substrate sheet 1 ′ are fixed to the outer surface of the object to be decorated 9. . The decoration 9 may be opaque or transparent. The decorative layer 2 has a colored layer 4 and an adhesive layer 5, and the decorative layer 2 ′ has a pattern layer 3 and an adhesive layer 5 ′. FIG. 5A shows an article formed when the outermost side is the base sheet 1 ′ and the base sheet is not peeled after the simultaneous injection molding. FIG. 5B shows an article formed when the outermost layer is the pattern layer 3 and the base sheet is peeled after the simultaneous injection molding.

  FIG. 6 is a cross-sectional view showing the structure of an intermediate decorated article formed in the process of manufacturing the decorated article shown in FIG. The decoration layer 2 and the transparent base sheet 1 are fixed to the outer surface of the object to be decorated 9. A method of decorating the interlayer or the surface using a decorative sheet at the same time as injection molding of two types of molten molding resins having different colors and materials is known, and is described in, for example, JP-A-9-207165. ing.

  The decoration 9 is not particularly limited as long as it is an article manufactured by an in-mold injection molding method. For example, a main body cover of a mobile phone, a main body cover of a notebook personal computer, a main body cover of a media player, and the like.

  Moreover, when the decorated article is a part, a decorated product having the decorative layer of the present invention on the surface of the finished product is obtained by assembling the part. The decorated product is not particularly limited as long as it is a finished product having the decorated article of the present invention as a part. For example, mobile information terminals such as mobile phones, notebook computers, media players, and the like can be given.

  FIG. 4 is a perspective view schematically showing a state in which the appearance of the decorated product according to the embodiment of the present invention is changed. The decorated product shown is a mobile phone 8.

  FIG. 4A shows an appearance when the mobile phone is assembled. At this time, it may be considered that the decoration layer is substantially fixed to the object to be decorated. The pattern layer 3 is present on the outermost side of the upper cover of the mobile phone 8, and the colored layer 4 is present on the inner side (mobile phone side). The picture layer 3 is transparent and does not appear as a picture on the appearance of the mobile phone. In FIG. 4A, the alternate long and two short dashes line means a virtual line, and the portion indicated by the alternate long and two short dashes line is actually invisible.

  FIG. 4B shows an appearance when a predetermined month and day have passed, such as about 1/2 of the useful life of a mobile phone, under normal use conditions where light is then irradiated. Yes. The color of the colored layer 4 that does not overlap with the pattern layer 3 (exposed part) becomes lighter, and the color of the part that overlaps with the pattern layer 3 (overlapped part) is maintained. The pattern of the grade which can recognize presence of the pattern layer 3 has appeared.

  FIG. 4C shows the appearance of the mobile phone when the date has passed. The exposed portion of the colored layer 4 is transparent, and a picture corresponding to the shape of the picture layer 3 appears on the appearance of the mobile phone.

  The present invention will be specifically described by the following examples, but the present invention is not limited thereto. In addition, unless otherwise indicated, the quantity represented by "part" or "%" in an Example is represented on the basis of mass.

Example 1
As an ultraviolet absorber, “RSA-0124” (trade name) manufactured by Shannan Synthetic Chemical Co., Ltd. was prepared. This has an absorption band in the 230 to 350 nm region of the spectrum. 50 parts of this ultraviolet absorber and 50 parts of methyl ethyl ketone were mixed to prepare an ultraviolet absorbing ink.

A biaxially stretched polyethylene terephthalate film having a thickness of 38 × 10 ⁻³ mm (38 μm) was used as the base sheet, and a vinyl chloride / vinyl acetate copolymer resin was applied to the entire surface of one side of the base sheet with a thickness of 1 × 10 ⁻³ mm ( The release layer was formed by printing by a gravure printing method so that the thickness was 1 μm.

On the release layer thus formed, the ultraviolet absorbing ink was partially printed by a gravure printing method and dried to form a picture layer. The thickness of the picture layer was 2 μm.

  As a colorant, ORASOL manufactured by Ciba was prepared. This is a dye having an ultraviolet resistance of 50 to 150 hours in an exposure test of JIS: K 7350-2. An ultraviolet fading ink was prepared using this dye.

  The ultraviolet fading ink was printed on the entire surface of the pattern layer formed on one side of the base sheet by a gravure printing method and dried to form a colored layer. The thickness of the colored layer was 2 μm.

An acrylic resin was printed on the entire surface of the colored layer by a gravure printing method so as to have a thickness of 1 × 10 ⁻³ mm (1 μm), thereby forming an adhesive layer.

  In this way, a decorative sheet (transfer material) of the present invention was obtained.

  The obtained decorative sheet was put into a mold and in-mold injection molding of acrylic resin was performed to create a main body cover for a mobile phone. The main body cover of the obtained mobile phone had a uniform gray appearance on the decorative surface, and the transparent striped pattern formed as the pattern layer was not visible.

  When the main body cover of the mobile phone was irradiated for 150 hours under the following conditions, the portion of the colored layer that did not overlap with the pattern layer was faded, and a striped pattern corresponding to the shape of the pattern layer became apparent.

[Table 1]

  The present invention is used to decorate the appearance of injection molded articles and industrial products whose parts are injection molded articles.

1 ... Base sheet,
2 ... decorative layer,
3 ... pattern layer,
4 ... colored layer,
5 ... Adhesive layer,
6 ... exposed part,
7 ... overlapping part,
8 ... Mobile phone,
9 ... Decoration.

Claims (8)

A decorative sheet having a decorative layer that can be fixed to an object to be decorated on the surface of the base sheet,
The decorative layer has a pattern layer and a colored layer,
The pattern layer overlaps with the colored layer and is arranged outside the colored layer.
The pattern layer is transparent, and is invisible when the decoration layer is fixed to the object to be decorated, but then the shape of the pattern layer is formed by selectively fading a portion that does not overlap with the pattern of the coloring layer. The pattern corresponding to
Decorative sheet.   The decorative sheet according to claim 1, wherein the pattern layer has ultraviolet absorptivity, and the colored layer has ultraviolet fading.   The period from the time when the decorative layer is fixed to the object to be decorated to the time when the pattern of the pattern layer becomes apparent is a period shorter than about 1/3 of the service life of the decorated product. The decorative sheet as described.   The decorating sheet according to claim 2 or 3, wherein the colorant contained in the colored layer is an ultraviolet fading dye.   The decorative sheet according to claim 4, wherein the ultraviolet fading dye has an ultraviolet resistance of 50 to 150 hours in an exposure test according to JIS: K 7350-2.   The decorative sheet according to claim 5, wherein the ultraviolet fading dye is a 1: 2 chromium complex dye. The process of sending the decorating sheet in any one of Claims 1-6 in the direction so that the pattern layer side of a decorating layer may face a mold cavity surface in the metal mold | die for shaping | molding;
Closing the mold and filling the mold cavity with the molten resin so that the molten resin contacts the inner surface of the decorative sheet (colored layer side of the decorative layer); and cooling the resin and mold Opening the injection mold and removing the injection molded body;
A method for decorating the surface of an injection-molded body including A decorated article having a decorative layer fixed to an object to be decorated,
The decorative layer has a colored layer and a pattern layer,
The pattern layer overlaps with the colored layer and is arranged outside the colored layer.
The pattern layer is transparent, and is invisible when the decoration layer is fixed to the object to be decorated. The pattern corresponding to
Decorated article.

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