JP2001272935A - Method for manufacturing illuminative decorative sheet and illuminative decorative molded goods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for manufacturing an illuminative decorative sheet and illuminative decorative molded goods which allow the exact alignment of light shielding pattern parts and translucent pattern parts and have light shieldability and translucency which are sure even after premolding. SOLUTION: The illuminative decorative sheet 8, which is formed with the light shielding pattern parts 6 and the translucent pattern parts 7 by having at least light shiedable colored layers 2 partially laminated on a transparent or translucent substrate sheet 1 and translucent colored layers 3 laminated wholly or partially thereon, is 0 to 10% in the total ray transmittance (in conformity with JIS K 7361-1) of the light shielding pattern parts 6 when the illuminative decorative sheet 8 is expanded to 200% elongation rate in a temperature region lower by 50 deg.C than the final displacement temperature measured in a region where the weight decrease in the heat flux DSC analysis (in conformity with JIS K 7121) of the substrate sheet 1 is <=1%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for illuminating a light-transmitting pattern portion such as characters and symbols even at night or in a dark room by irradiating a light source from the back surface to facilitate recognition. The present invention relates to a method for manufacturing a decorative sheet and an illuminated decorative molded product, and can be applied to home electric appliances, automobile parts, key mat members for mobile phones, and the like.

[0002]

2. Description of the Related Art Heretofore, as a method of obtaining an illuminating component having a translucent pattern portion, there has been a method of using an illuminating decorative sheet. The illuminating decorative sheet, on a transparent or translucent base sheet, by having at least a light-shielding colored layer partially laminated, and a translucent colored layer entirely or partially laminated, A light-shielding pattern portion and a light-transmitting pattern portion are formed.

[0003] The illuminating decorative sheet having such a configuration is preformed so as to conform to the shape of a mold, and then placed in a mold having a cavity, and a molten resin is injected into the mold. An illuminated decorative molded product in which the illuminated decorative sheet and the molten resin are integrated can be obtained.

[0004]

However, in the process of manufacturing an illuminated decorative molded article manufactured using such an illuminated decorative sheet, there is a problem that the positioning accuracy is low during preforming. For example, in the vacuum pressure forming method generally used as a preforming method, since the decorative sheet is preformed into a three-dimensional shape after being heated to a softening point or higher,
Since the illuminating decorative sheet itself expands and contracts, and pattern position fluctuations and distortions occur irregularly, making it difficult to correct it, it has been difficult to obtain high alignment accuracy.

Another problem is that light leakage occurs during preforming. That is, due to the thickness of the light-shielding colored layer and the flexibility of the resin used for the light-shielding colored layer, the light-shielding colored layer cannot follow local elongation generated during pre-molding, so that the layer is extremely thin. In some cases, the transmitted light cannot be sufficiently shielded by being stretched, or the light-shielding colored layer itself breaks, resulting in light leakage.

Accordingly, the present invention solves the above-mentioned problems, enables accurate alignment between the light-shielding pattern portion and the light-transmitting pattern portion, and ensures reliable light-shielding and light-transmitting properties even after preforming. It is an object of the present invention to provide a method for manufacturing a decorative sheet and a decorative decorative molded article.

[0007]

The illuminated decorative sheet and the method for producing an illuminated decorative molded product of the present invention have the following constitutions in order to achieve the above objects.

That is, the illuminating decorative sheet of the present invention comprises:
On a transparent or translucent base sheet, a light-shielding colored portion partially laminated, and at least a light-transmitting colored layer entirely or partially laminated, a light-shielding pattern portion and a light-transmitting pattern Flow rate DSC analysis of the base sheet in the illuminating decorative sheet having
K7121) in a temperature range 50 ° C. lower than the final displacement temperature measured in a region where the weight loss is 1% or less,
The total light transmittance (based on JIS K7361-1) of the light-shielding pattern portion when the illuminating decorative sheet was extended to an elongation of 200% was configured to be 0 to 10%.

In the above invention, the light-transmitting pattern portion has a total light transmittance (based on JIS K7361-1) 2.
You may comprise so that it may be 0-100%.

[0010] In the above invention, the illuminating decorative sheet may have an adhesive layer.

In the above invention, the light-shielding colored layer may have a metallic luster color.

In the above invention, the illuminating decorative sheet may be preformed.

In the above invention, the weight of the illuminating decorative sheet is measured in a region where the weight loss of the base sheet constituting the illuminating decorative sheet is 1% or less in a heat flow DSC analysis (based on JIS K7121). 3 from the final displacement temperature
You may comprise so that it may be preformed in the temperature range 0-70 degreeC low.

Further, according to the method of manufacturing an illuminated decorative molded product of the present invention, the illuminated decorative sheet according to any one of claims 1 to 4 is preformed so as to conform to the shape of a mold, and then the metal having a cavity is formed. It was set up in a mold, a molten resin was injected into the mold, and a molded product in which the decorative sheet and the molten resin were integrated was obtained.

Further, the illuminating decorative sheet according to claim 5 is installed in a mold having a cavity, a molten resin is injected into the mold, and the decorative sheet and the molten resin are integrated. It was configured to obtain a molded article.

[0016]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are cross-sectional views showing one embodiment of the illuminating decorative sheet of the present invention. FIG. 3 is a sectional view showing an example in which the illuminating decorative sheet of the present invention is preformed.
FIG. 4 is a cross-sectional view showing one embodiment of an illuminated decorative molded product obtained using the illuminated decorative sheet of the present invention. FIG.
FIG. 4 is a cross-sectional view showing a stretched portion for calculating an elongation percentage of the illuminated decorative sheet of the present invention. In the figure, 1 is a base sheet, 2
Is a light-shielding colored layer, 3 is a light-transmitting colored layer, 4 is an adhesive layer, 6 is a light-shielding pattern portion, 7 is a light-transmitting pattern portion, 8 is an illuminating decorative sheet, 9 is a molding resin, and 10 is a mold. is there.

The illuminating decorative sheet 8 of the present invention comprises a light-shielding colored layer 2 partially laminated on a transparent or translucent base sheet 1 and a light-transmitting colored layer 2 entirely or partially laminated. By having at least the coloring layer 3, in the illuminating decorative sheet 8 on which the light-shielding pattern portions 6 and the light-transmitting pattern portions 7 are formed, the weight loss of the base sheet 1 in the heat flow DSC analysis (based on JIS K7121) is reduced. The total light transmittance (JIS K7) of the light-shielding pattern portion 6 when the illuminating decorative sheet 8 is expanded to 200% in a temperature region lower by 50 ° C. than the final displacement temperature measured in the region of 1% or less.
361-1) is 0 to 10% (FIG. 1).
~ 2).

The base sheet 1 is transparent or translucent and serves as a support for the illuminating decorative sheet 8.

As the base sheet 1, a single-layer film made of a polycarbonate resin, a polyamide resin, a polyimide resin, a polyester resin, an acrylic resin, an olefin resin, a urethane resin or the like is preferably used. Further, a laminated film or a copolymer film of two or more resins selected from these may be used. The thickness of the base sheet 1 is preferably 50 to 250 μm. 50μ
If it is less than m, there is a high risk of not being able to follow the elongation at the time of preforming, or breaking at a location where the elongation becomes a thin part. If the thickness exceeds 250 μm, it takes a long time to heat the illuminating decorative sheet 8 to an optimal state for preforming, and the production efficiency is poor. Further, even if the function of the base sheet 1 as a surface protective layer of the illuminated decorative molded product is taken into consideration, a thickness exceeding 250 μm is unnecessary and leads to an increase in cost.

The total light transmittance of the base sheet 1 is preferably at least 65%. If it is less than 65%, the base sheet 1 takes on a milky white color and changes the color of the light-shielding colored layer 2 and the translucent colored layer 3, so that the desired color may not be reproduced.

The light-shielding colored layer 2 is a layer for blocking light from a light source, and is a layer that expresses the light-shielding pattern portion 6 by being partially laminated.

The light-shielding colored layer 2 is made of a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, an alkyd resin. It is preferable to use a colored ink containing a resin such as a binder and a pigment or dye of an appropriate color as a colorant. As a method for forming the ink layer, there are printing methods such as an offset printing method, a gravure printing method, and a screen printing method. In particular, in the present invention in which a large ink layer is required, a screen printing method is suitable.

The binder for the light-shielding colored layer 2 is a two-component curable urethane resin or polyester resin, or a one-component polycarbonate resin having excellent heat resistance and flexibility. It is preferable to use Since the ink layer that is not easily softened by heating during pre-forming does not adhere to the pre-forming mold, the pre-formed illuminable decorative sheet 8 can be removed without breaking its three-dimensional shape. Light leakage does not occur because it follows rapid and local elongation during molding. Also,
When coming into contact with the high-temperature molten resin, the possibility that the light-shielding colored layer 2 melts and the appearance becomes poor is reduced.

When the light-shielding colored layer 2 is desired to be formed as a single layer in a light color or a metallic gloss color having poor light-shielding properties, a light-shielding colored layer obtained by mixing a carbon black pigment having light-shielding properties with a binder. 2 may be separately laminated to form a structure of two or more layers.

In the case where the entire pattern cannot be obtained in the above-mentioned range even if a cut pattern having a sharp edge is formed in one layer, the number of plate lines is set so as to give priority to the reproducibility of the cut pattern. The first light-shielding colored layer 2 is formed on the plate in which
The second or third or later light-shielding colored layer 2 may be formed by laminating so as to have a cut pattern pattern having a large clearance allowance of 0.5 mm and a film thickness capable of securing light-shielding properties.

The light-shielding colored layer 2 has a thickness of 3.0 to 30 μm.
Is preferred. If the film thickness is less than 3.0 μm, sufficient light-shielding properties may not be ensured at a portion that becomes a thin portion due to extension during preforming. If the film thickness exceeds 30 μm, the film thickness may interfere at the time of preforming, and it may not be possible to sufficiently reproduce a shape at a corner or the like. In addition, since the residual solvent is not easily volatilized, the mold releasability at the time of preforming is deteriorated, and the light-shielding colored layer 2 easily flows at the time of injecting the molten resin.

The light-transmitting colored layer 3 is entirely or partially laminated, so that the light-transmitting pattern portion 7 such as a colored character or symbol can be formed at a portion where the light-shielding colored layer 2 does not exist.
Is a layer that expresses

The light-transmitting colored layer 3 may be the same as the light-shielding colored layer 2 except that it has a light-transmitting property.

In particular, a two-part curable urethane resin or polyester resin or a one-part polycarbonate resin is used as a binder for the translucent colored layer 3, and is excellent in heat resistance and flexibility. Preferably, one is used. Since the ink layer that is not easily softened by heating during pre-forming does not adhere to the pre-forming mold, the pre-formed illuminable decorative sheet 8 can be removed without breaking its three-dimensional shape. It follows the rapid and local elongation during molding. Further, when the transparent coloring layer 3 comes into contact with the high-temperature molten resin, the possibility that the transparent coloring layer 3 is melted and the appearance becomes poor is reduced.

The light-transmitting colored layer 3 is formed by adjusting the color and thickness of the color pigment mixed with the binder so that the total light transmittance of the light-transmitting pattern portion 7 becomes 20 to 100%. 3 may be formed.

The translucent colored layer 3 may be a transparent or translucent colored layer having a tint that satisfies not only white but also the total light transmittance in the above range.

The thickness of the translucent colored layer 3 is 3.0 to 3.0.
30 μm is preferred. The thickness of the translucent colored layer 3 is 3.0 μm.
If it is less than m, the translucent colored layer 3 is melted by the heat of injection molding of the high-temperature molten resin, resulting in poor appearance. Also, 30
When the thickness exceeds μm, the total light transmittance of the translucent colored layer 3 itself becomes low, so that light from the light source becomes difficult to transmit, and characters and symbols become difficult to recognize.

As described above, in the illuminating decorative sheet 8 on which the light-shielding pattern portion 6 and the light-transmitting pattern portion 7 are formed,
The adhesive layer 4 may be formed.

The adhesive layer 4 is a layer for bonding the illuminating decorative sheet 8 to the molding resin 9. The adhesive layer 4 is formed on the translucent coloring layer 3 and the light-shielding coloring layer 2.

The adhesive layer 4 is preferably transparent or translucent. Further, the adhesive layer 4 may be colored so that it can also be used as the light-shielding colored layer 2 or the light-transmitting colored layer 3.

As the adhesive layer 4, a heat-sensitive or pressure-sensitive resin suitable for adhering the illuminating decorative sheet 8 to the molding resin 9 is appropriately used. For example, when the material of the molding resin 9 is a polyacrylic resin, a polyacrylic resin may be used. When the material of the molding resin 9 is a polyphenylene oxide / polystyrene resin, a polycarbonate resin, a styrene copolymer resin, or a polystyrene blend resin, a polyacryl resin, a polystyrene resin having an affinity for these resins, A polyamide resin, a vinyl chloride resin, or the like may be used. Further, when the material of the molding resin 9 is a polypropylene resin, a chlorinated polypropylene resin, an ethylene vinyl acetate resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, and a coumarone indene resin are used. It is possible. When the material of the molding resin 9 is adhered to a thermosetting plastic resin such as silicone rubber, an organic solvent solution of a titanate ester, a carbon-functional silane, or a mixture thereof, a polyurethane resin, a polyester resin, ethylene -A vinyl acetate copolymer resin, a polyvinyl chloride resin, an acrylic resin, a butyral resin, an acetal resin, or a resin obtained by adding alkoxysilane, chlorosilane, or the like as a silane compound to the resin can be used.

As a method for forming the adhesive layer 4, there are a printing method such as a gravure printing method and a screen printing method, and a coating method such as a gravure coating method, a roll coating method and a spray coating method.

Further, a light-transmitting white layer may be provided below the light-transmitting colored layer 3. The translucent white layer is formed when it is desired to make the color of the translucent colored layer 3 more vivid. The light-transmitting white layer is preferably provided in the same manner as the light-transmitting colored layer 3.

Further, a metal thin film layer may be provided on the light-shielding colored layer 2 side of the illuminating decorative sheet 8. The metal thin film layer is a layer provided to express metallic luster.

The metal thin film layer is formed by a vacuum evaporation method, a sputtering method, an ion plating method, a plating method, or the like. Moreover, you may form by laminating a metal foil. Aluminum, nickel, gold, platinum, chromium, iron, copper, tin,
Use metals such as indium, silver, titanium, lead, zinc, and alloys or compounds thereof. The metal thin film layer can be formed entirely or partially. Further, an anchor layer may be formed to improve the adhesion between the metal thin film layer and the light-shielding colored layer 2.

According to the present invention, the heat flux DSC analysis (based on JIS K7121) of the base sheet 1 reduces the weight loss by 5% from the final displacement temperature measured in an area of 1% or less.
In the 0 ° C. lower temperature range, the illuminating decorative sheet 8 is stretched by 20%.
It is important that the total light transmittance (according to JIS K7361-1) of the light-shielding pattern portion 6 when it is extended to 0% is 0 to 10%.

The heat flow rate DSC analysis based on JIS K7121 is a method of measuring a melting temperature, a crystallization temperature, and a glass transition temperature as a method of measuring a transition temperature of a plastic.
In this method, the temperature difference between the test piece and the reference material is measured as a function of the temperature while changing the temperature of the test piece and the reference material according to an adjusted program.

The reason why the temperature range lower by 50 ° C. than the final displacement temperature measured by the heat flow rate DSC analysis of the base sheet 1 was adopted is that, as shown in the preforming test results shown in Table 1, high precision alignment was performed in the preforming. This is because the temperature conditions are optimal for various requirements such as.

That is, as a preforming test, the final displacement temperature of the base sheet 1 was measured by thermal flow velocity DSC analysis using the illuminating decorative sheet 8 composed of various base sheet 1 materials and colored layer materials. The decorative sheet 8 was subjected to three-dimensional drawing at various temperatures, and evaluated for positional accuracy, pattern distortion, shape reproducibility, flexibility, and releasability after molding (see Table 1). The preforming is performed using an ultra-high pressure molding machine manufactured by Kneebring, and using an air pressure of 100 bar.
I went in. In Table 1, ○ indicates good and X indicates bad.

[0046]

[Table 1]

Here, the final displacement temperature is defined by JIS K7
In the measurement chart of the base sheet 1 measured by the heat flow rate DSC defined in 121, the weight loss was measured at the highest temperature part among the displacement points due to either endotherm or heat generation measured in an area of 1% or less. A thing. When the base sheet 1 is made of a single resin, a measurement chart is obtained in which the displacement temperature measured by the heat flow rate DSC can be generally recognized as a glass transition point. However, when the base sheet 1 is a copolymer composed of two or more resins, a plurality of displacements without a glass transition phenomenon are often seen in the measurement chart depending on the degree of polymerization and the mixing ratio. Therefore, in the present invention, in order to specify such a case, the one measured as the maximum temperature in the region where the weight loss is 1% or less on the measurement chart is defined as the final displacement temperature.

As shown in the test results of the preforming described above, the present invention finds the relationship between the final displacement temperature, which is the thermal property of the illuminating decorative sheet 8, and the optimum temperature condition for the preforming. That is what it is. That is, the difference between the final displacement temperature in the region where the weight loss is 1% or less in the heat flow rate DSC of the various base sheets 1 and the optimal forming temperature in the pre-forming of the illuminating decorative sheet 8 is approximately 30 ° C. to 70 ° C.
The intermediate value of 50 ° C. was set as a reference value.

In the case of keypad parts for portable telephones for illumination parts for which high-precision alignment is required, a height of 2.5 to 3 is required.
mm buttons are adjacent to each other at a distance of 3 to 4 mm, and the elongation rate of the illuminable decorative sheet 8 in such a specification is expressed as “elongation rate (%) = [(extension distance B + C + D) / illuminable decorative sheet. Various calculations were performed using the sheet 8 plane distance A] × 100 ”(see FIG. 5), and it was found that the elongation percentage for maintaining the light-shielding property of the illuminating decorative sheet 8 was at least 200%. . Therefore, in the present invention, the elongation percentage of 200% refers to a state in which the illuminating decorative sheet 8 of an arbitrary size is expanded at an set temperature and at an arbitrary speed and a tensile load, and the dimension is doubled. Shall be referred to.

The illuminable decorative sheet 8 is stretched at an elongation of 200%.
%, The total light transmittance of the light-shielding pattern portion 6 when extended to
At the time of preforming, a portion where light leakage or an appearance defect of an ink crack occurs is locally concentrated at a portion where the elongation is increased by 200% or more. This is a criterion for determining whether or not the light shielding property is secured.

Under the above conditions, JIS K7361
It is important that the total light transmittance of the light-shielding pattern portion 6 according to a measurement method conforming to −1 be 0 to 10%. That is, the total light transmittance of the light shielding pattern portion 6 is 0 to 0.
When it is in the range of 10%, the light from the light source can be reliably blocked, and the light-transmitting pattern portion 7 can be reliably recognized. The total light transmittance of the light shielding pattern portion 6 is 1
If it exceeds 0%, it is impossible to follow the local extension in the preforming step, and light leakage occurs.

The total light transmittance of the light shielding pattern portion 6 is 0 to 1
In order to make it 0%, the color and the mixing ratio of the pigment added to the binder of the light-shielding colored layer 2 may be adjusted, or the thickness of the light-shielding colored layer 2 may be adjusted. Note that the total light transmittance of the light-shielding pattern portion 6 referred to in the present invention refers to the light-shielding colored layer 2.
It refers to the total light transmittance of the light-shielding pattern portion 6 in the entire illuminating decorative sheet 8 instead of the total light transmittance of only the light-emitting decorative sheet 8.

According to JIS K7105, which is a conventional method for measuring the optical properties of plastics, there is a problem in that, due to the efficiency of the integrating sphere that captures diffused light, a value higher than the theoretical value is exhibited depending on the conditions of the equipment used. Calibration by the double beam method was necessary to obtain more accurate values. JIS K7361- adopted in the present invention
Reference numeral 1 is a measurement method which is a deficiency of the conventional method and is established simultaneously with the ISO standard.

The total light transmittance of the light transmitting pattern portion 7 is preferably 20 to 100%.

The total light transmittance of the light transmitting pattern portion 7 is 20 to
When it is within the range of 100%, light from the light source is sufficiently transmitted, and the light transmission pattern portion 7 can be reliably recognized. If the total light transmittance of the light transmitting pattern portion 7 is less than 20%, light from the light source cannot be sufficiently transmitted, and it is difficult to determine the light transmitting pattern portion 7 such as formed characters and symbols. .
In order for the total light transmittance of the light transmitting pattern portion 7 to be 20 to 100%, the color and the mixing ratio of the pigment added to the binder of the light transmitting colored layer 3 are adjusted, The thickness of the layer 3 may be adjusted. The total light transmittance of the light-transmitting pattern portion 7 is not the total light transmittance of only the light-transmitting colored layer 3 but the total light transmittance of the light-transmitting pattern portion 7 in the entire illuminating decorative sheet 8. Say.

Table 2 shows an example of the relationship between the total light transmittance of the light shielding pattern portion 6 of the illuminating decorative sheet 8 and its evaluation. As an evaluation, it was confirmed whether or not light leakage and cracks occurred in the light shielding pattern portion 6.

[0057]

[Table 2]

Table 3 shows an example of the relationship between the total light transmittance of the translucent pattern portion 7 of the illuminating decorative sheet 8 and its evaluation. As an evaluation, it was confirmed whether or not the visibility of the light transmitting pattern portion 7 was ensured. The illuminable decorative sheet 8 was formed into a shape as shown in FIG. 3 so that the translucent pattern portion 7 was located on the top surface of the button portion of the molded product. As a result, the total light transmittance after extension was not measured.

[0059]

[Table 3]

The total light transmittance shown in Tables 2 and 3 was measured by a total light transmittance meter Model- manufactured by Nippon Denshoku Industries Co., Ltd.
It was measured using NDH2000. Specifically, three 50 × 50 mm test pieces having the light-shielding pattern portion 6 or the light-transmitting pattern portion 7 of the illuminating decorative sheet 8 are prepared, a standard white plate is attached to the total light transmittance measuring device, and the incident light amount is measured. Then, the test piece was set with the standard white plate attached, and the total light transmittance was measured to obtain the total light transmittance.

In order to obtain an illuminated decorative molded product using the illuminated decorative sheet 8 having the above-described configuration, first, the illuminable decorative sheet 8 is preformed so as to conform to the shape of a mold ( (See FIG. 3). Preforming is a vacuum pressure forming method, vacuum forming method, hydraulic forming method generally known as a preforming method,
It may be performed by a high-pressure molding method, a die press molding method, or the like.

In the preforming, the illuminating decorative sheet 8 is formed by heating the base sheet 1 constituting the illuminating decorative sheet 8 with a heat flux DSC.
1 weight loss in analysis (based on JIS K7121)
% From the final displacement temperature measured in the region of
It is preferably performed in a temperature range lower by ° C. This is because within this range, there is little possibility that problems will occur in positional accuracy, pattern distortion, shape reproducibility, mold release, and flexibility.

Next, the preformed illuminating decorative sheet 8
Is placed in a mold having a cavity, and molten resin is injected into the mold to obtain a molded product in which the decorative sheet and the molten resin are integrated.

The molding resin 9 has a total light transmittance of 20
It is preferable to use a material that can be filled and molded into the mold cavity by injection molding or compression molding. For example, acrylic resin, acrylonitrile styrene resin, polycarbonate resin, polypropylene resin, silicone resin, and the like can be used.

The light-transmitting pattern portion 7 is usually formed as a cut pattern such as a character or a symbol by partially forming the light-shielding colored layer 2, and is colored by the light-transmitting colored layer 3. Then, light is transmitted by being illuminated by a light source from the back side, and the shape of characters and symbols can be recognized.

Thus, an illuminated decorative molded product can be obtained (see FIG. 4).

The illuminated decorative molded product thus obtained is
The light-shielding pattern part 6 and the light-transmitting pattern part 7 are accurately aligned, and have reliable light-shielding properties and light-transmitting properties. In particular, when the illuminated decorative molded article has a high luminance such as a metallic luster as an external color, the mixing ratio of the aluminum pigment contained in the ink layer becomes high, so that the binder in the ink layer is relatively high. Of the ink layer itself, the flexibility of the ink layer itself is lost, and in the preforming process, the appearance of defects such as light leaks and ink cracks in the local extension area has frequently occurred. It is useful to check whether or not the decorative sheet 8 has the total light transmittance within the range of the present invention, because it is possible to judge whether or not molding failure occurs before performing the preliminary molding.

[0068]

(Example 1) A two-component curable urethane resin-based ink (Seiko Advance Co., Ltd.) was used as a base sheet of a 125 μm thick polycarbonate film (Iupilon, manufactured by Mitsubishi Plastics, Inc.) as a light-shielding colored layer. SG410) having a film thickness of 5 μm is partially formed by a screen printing method, and then a two-part curable urethane resin-based ink (SG410 manufactured by Seiko Advance Co., Ltd.) having a film thickness of 3 μm is entirely formed as a translucent colored layer. Then, an adhesive layer made of vinyl chloride-vinyl acetate copolymer resin was formed with a thickness of 5 μm to obtain an illuminable decorative sheet.

The illuminated decorative sheet thus obtained is
The total light transmittance of the light shielding pattern portion was 5%, and the total light transmittance of the light transmitting pattern portion was 80%.

The final displacement temperature was 165 ° C. when the base sheet was measured by a heat flow rate DSC defined in JIS K7121. Based on this measurement result, the illuminated decorative sheet 200
%, The total light transmittance of the light-shielding pattern portion of the illuminating decorative sheet was 8%. Even when the illuminating decorative sheet was extended by 200%, light leakage due to transparency and ink cracks was observed. The illuminating decorative sheet did not generate.

Next, the illuminating decorative sheet was heated to a surface temperature of 1
Softening was performed under molding conditions of 15 ° C. ± 5 ° C., and pre-molding was performed by high-pressure molding with a positioning accuracy tolerance of the light-transmitting pattern portion within a range of ± 0.2 mm.

Next, the preformed illuminating decorative sheet is placed in a mold having a cavity shape corresponding to a three-dimensional shape, and a polycarbonate resin (Macrolon 2205 manufactured by Bayer) is injected as a molding resin, and is cooled and solidified. Thus, an illuminated decorative molded product was obtained, which was an illuminable keypad component in which the illuminable decorative sheet was integrated on the surface.

The illuminated decorative molded product thus obtained is
The translucent pattern portion had a very excellent appearance formed by being positioned at an arbitrary position on the illuminating keypad component display portion with high accuracy with a tolerance of ± 0.2 mm. In addition, there was no light leakage in the extended portion when the backlight was illuminated, and the light-transmitting pattern portion had excellent transparency and light-shielding properties that could be sufficiently recognized.

Example 2 A two-component curable urethane resin ink was used as a light-shielding colored layer on a base sheet of a polycarbonate-polybutylene terephthalate copolymer film (by-hole film manufactured by Bayer) having a thickness of 125 μm. (S made by Osaka Printing Ink Manufacturing & Sales Co., Ltd.
P) to form a 3 μm-thick metallic glossy light-shielding pattern
Then, a black light-shielding colored layer formed by mixing a carbon black pigment so as to have a light-transmitting pattern part 0.2 mm larger than the light-transmitting pattern part formed by the light-shielding colored layer is formed to a thickness of 5 μm. The light-shielding colored layer having a metallic luster color was formed so that the total light transmittance was 8%.

Next, as a light-transmitting colored layer, a two-part curable urethane resin-based ink (SG410, manufactured by Seiko Advance Co., Ltd.) was partially screen-printed to a thickness of 3 μm by a screen printing method to partially transmit the entire light of the light-transmitting colored layer. Then, an adhesive layer made of a vinyl chloride-vinyl acetate copolymer resin was formed to a thickness of 5 μm to obtain an illuminating decorative sheet.

The illuminated decorative sheet thus obtained is
The total light transmittance of the light shielding pattern portion was 8%, and the total light transmittance of the light transmitting pattern portion was 80%.

The final displacement temperature was 150 ° C. when the base sheet was measured by a heat flow rate DSC defined in JIS K7121. When the total light transmittance of the illuminated decorative sheet at 200% extension was measured at an ambient temperature of 100 ° C. based on the measurement result, the total light transmittance of the light-shielding pattern portion of the illuminated decorative sheet was 10%. Further, the illuminating decorative sheet was a illuminating decorative sheet in which even when the illuminating decorative sheet was extended by 200%, light leakage due to transparency and ink cracks did not occur.

Then, the illuminating decorative sheet was heated to a surface temperature of 10
When softened under the molding conditions of 0 ° C ± 5 ° C and preformed by high pressure molding, a tolerance of positional accuracy of ± 0.15mm was realized, the cavity shape of the injection mold was sufficiently reproduced, and light leakage at the maximum extension part. Did not occur.

Next, the preformed illuminating decorative sheet is placed in a molding die having a cavity shape corresponding to a three-dimensional shape so as to be fitted into the cavity, and a polycarbonate resin (Bayer Macrolon 22) is used as a molding resin.
05) was injected and cooled and solidified to obtain an illuminated decorative molded article which is an illuminated automobile interior part having an illuminated decorative sheet integrated on the surface.

The illuminated decorative molded product thus obtained is
High-brightness metallic luster, excellent appearance with no distortion or misalignment of the translucent pattern part, and transparency that allows the translucent pattern part to be clearly recognizable when illuminated by the backlight even when used in dark areas And had light-shielding properties.

(Example 3) A polycarbonate-polybutylene terephthalate copolymer resin film (macrohole film manufactured by Bayer Co.) having a thickness of 125 µm was used as a base sheet, and a silver-toned color was formed thereon as a translucent colored layer.
A liquid-curable urethane ink is coated on the entire surface with a roll coater to a thickness of 2 μm. After cutting, a black ink (SG410 manufactured by Seiko Advance Co., Ltd.) is used as a light-shielding colored layer, and the thickness is 5 μm by screen printing. Thus, an illuminating decorative sheet was obtained.

The illuminated decorative sheet thus obtained is
A light-transmitting pattern portion composed of a silver single layer portion having a total light transmittance of 30% and a light-shielding pattern portion composed of a silver layer / black layer laminated portion having a total light transmittance of 10% were formed.

The final displacement temperature was 150 ° C. when the base sheet was measured by a heat flow rate DSC defined in JIS K7121. When the total light transmittance of the illuminated decorative sheet at 200% extension was measured at an ambient temperature of 100 ° C. based on the measurement result, the illuminated decorative sheet was
The total light transmittance of the light-shielding pattern portion was 10%, and the illuminating decorative sheet was a illuminating decorative sheet in which even when the illuminating decorative sheet was extended by 200%, light leakage due to transparency and ink cracks did not occur.

Next, the illuminating decorative sheet was heated to a surface temperature of 10
When softened under the molding conditions of 0 ° C ± 5 ° C and preformed by high pressure molding, a tolerance of positional accuracy of ± 0.15mm was realized, the cavity shape of the injection mold was sufficiently reproduced, and light leakage at the maximum extension part. There was no.

Next, the preformed illuminating decorative sheet is arranged so as to be fitted in a molding die having a cavity shape corresponding to a three-dimensional shape, and an acrylic resin is injected as a molding resin and cooled and solidified to form an illuminating sheet. An illuminated decorative molded product, which is an illuminable automotive interior part having a decorative sheet integrated on the surface, was obtained.

The illuminated decorative molded product thus obtained is
It has a silver metallic luster and has an excellent appearance without distortion or misalignment of the translucent pattern part. Even when used in a dark part, the transmissive pattern part can be clearly recognized when illuminated by the backlight. It had properties and light-shielding properties.

[0087]

Since the present invention has the above-described structure, it has the following effects.

The illuminating decorative sheet of the present invention comprises a light-shielding colored layer partially laminated on a transparent or translucent base sheet, and a translucent colored layer entirely or partially laminated on a transparent or translucent base sheet. In the illuminated decorative sheet in which the light-shielding pattern portion and the light-transmitting pattern portion are formed by having at least the following, the heat flux DSC analysis of the base sheet (JIS K71)
21), the total light transmittance of the light-shielding pattern portion when the illuminating decorative sheet is extended to 200% in a temperature region 50 ° C. lower than the final displacement temperature measured in a region where the weight loss is 1% or less. (JIS K7361-1 compliant) is 0
Since it is 10% or less, the light-shielding pattern portion and the light-transmitting pattern portion can be accurately positioned, and have reliable light-shielding properties and light-transmitting properties even after preforming.

Further, in the method for producing an illuminated decorative molded product according to the present invention, the illuminated decorative sheet is preformed so as to conform to the shape of the mold, and then placed in a mold having a cavity. Since the molten resin is injected into the mold to obtain a molded product in which the decorative sheet and the molten resin are integrated, the light-shielding pattern part and the light-transmitting pattern part are accurately aligned, and reliable light shielding is achieved. It is possible to easily obtain an illuminated decorative molded product having a light-transmitting property.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an illuminating decorative sheet of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the illuminating decorative sheet of the present invention.

FIG. 3 is a cross-sectional view showing an example in which the illuminating decorative sheet of the present invention is preformed.

FIG. 4 is a cross-sectional view showing one embodiment of an illuminated decorative molded product obtained using the illuminated decorative sheet of the present invention.

FIG. 5 is a cross-sectional view showing a stretched portion for calculating an elongation percentage of the illuminable decorative sheet of the present invention.

[Description of Signs] 1 Base sheet 2 Light-blocking colored layer 3 Light-transmitting colored layer 4 Adhesive layer 6 Light-blocking pattern section 7 Light-transmitting pattern section 8 Illuminating decorative sheet 9 Molding resin 10 Mold

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 4F100 AK15 AK22 AK45 AK51 AL01 AT00A BA02 BA03 BA04 BA07 BA10A BA10B BA10C CB00D DC30B DC30C EH46 GB48 GB90 JL10B JL10C JN01 JN01A JN01C JN02 JN02A JAA A4A JB13 5C096 AA01 AA27 BA01 CA02 CA28 CB01 CJ01 EB02 EB08

Claims (8)

[Claims] 1. A light-shielding pattern comprising at least a light-shielding colored layer partially laminated and a light-transmitting colored layer partially or entirely laminated on a transparent or translucent base sheet. In the illuminating decorative sheet in which the portions and the translucent pattern portions are formed, the heat flow rate DS of the base sheet
In the C analysis (according to JIS K7121), the light-shielding pattern portion when the illuminating decorative sheet is expanded to 200% in a temperature region 50 ° C. lower than the final displacement temperature measured in a region where the weight loss is 1% or less is measured. Total light transmittance (JIS K
7361-1) is 0 to 10%. 2. The light-transmitting pattern portion has a total light transmittance (JI
The illuminating sheet according to claim 1, wherein the illuminating sheet is 20 to 100%. 3. The illuminable decorative sheet according to claim 1, wherein the illuminable decorative sheet has an adhesive layer. 4. The illuminating decorative sheet according to claim 1, wherein the light-shielding colored layer has a metallic glossy color. 5. The illuminated decorative sheet according to claim 1, wherein the illuminated decorative sheet is preformed. 6. A heat flux DSC analysis (JIS K) of the base sheet constituting the illuminable decorative sheet.
The illuminating decoration according to any one of claims 1 to 4, wherein the preformed body is preformed in a temperature region lower by 30 to 70 ° C than a final displacement temperature measured in a region where the weight loss is 7% or less. Sheet. 7. The illuminating decorative sheet according to claim 1, which is preformed so as to conform to the shape of the mold, is then placed in a mold having a cavity, and the molten resin is injected into the mold. And obtaining a molded product in which the decorative sheet and the molten resin are integrated with each other. 8. The illuminating decorative sheet according to claim 5 is installed in a mold having a cavity, a molten resin is injected into the mold, and the decorative sheet and the molten resin are integrated. A method for producing an illuminated decorative molded product, comprising obtaining a molded product.