JP5876854B2 - Base material with high decorative property for shining emblem and method for producing the same - Google Patents

Description

  The present invention relates to a base material for a shining emblem having a high decorative property used in automobile exteriors and the like, and a method for producing the same.

  Among the emblems used in automobile exteriors and the like, there is a product that has been introduced to the market as a shining emblem. Such a shining emblem is a combination of a light-emitting diode element and a light guide plate on the rear surface of a resin-plated emblem based on ABS resin or PC / ABS resin, and is arranged in front of a light-emitting portion that irregularly reflects. The thing of the form that the outline of a resin emblem appears is disclosed (for example, refer patent document 1).

Japanese Patent No. 4790095

  Such a normal shining emblem is only for characters, figures, symbols, etc. (hereinafter referred to as characters), by illuminating the outer contour and the frame of the opening, so that the normal emblem that is not a shining emblem is not Although it is superior in terms of appearance, the emblem as a whole cannot be said to have high decorativeness because the shining part is limited to the outer contour and the opening.

  In the present invention, not only the contours of characters and the like having metallic luster, but also the pattern portions taking into account the decorativeness, when the base material is irradiated using a light source, the characters and the patterns can be raised and shown. It is an object of the present invention to provide a base material for emblems with high decorativeness and a method for producing the same.

を満たすことを特徴とするエンブレム用基材に関する。 The present invention is a base material for emblems using a transparent resin, a modeling part that forms characters, figures, and / or symbols having metallic luster, a translucent part that borders the modeling part and is capable of transmitting light, It has a main body part other than the modeling part and the light transmitting part, and the light transmittance from the back surface to the front surface of the emblem base material in the light transmitting part, and the light transmittance from the back surface to the front surface of the emblem base material in the main body part. Are measured at 380 nm to ₇₀₀ nm, the value at the wavelength showing the maximum value in the light transmitting part is defined as T _1max, and the value at the wavelength indicating the maximum value of the emblem substrate in the main body part is defined as T _2max. When formula (1):

It is related with the base material for emblems characterized by satisfy | filling.

  It is preferable that the width | variety of a translucent part is variable in the range of 0.4-1.5 mm.

  The modeling part preferably has a metal thin film.

  The metal thin film is preferably vapor deposited aluminum.

  The shape is preferably a flat plate shape or a curved plate shape.

  The present invention is a base material for an emblem using a transparent resin, and a transparent resin base material having a letter-like, figure-shaped and / or symbol-like concave part is formed on the back surface, and the back surface of the obtained transparent resin base material By providing a metal thin film and applying paint to the recesses, a modeling part that forms characters, figures and / or symbols with metallic luster is provided, and the metal thin film provided on the part other than the modeling part on the back surface is removed. A translucent part that forms a coating film on the back surface and borders the modeled part after using a mask on the back side that has a shape that conforms to the shape of the modeled part and that is larger than the modeled part. It is related with the base material for emblems obtained by providing a main-body part with lower light transmittance than this.

  It is preferable that the mask has a shape larger than that of the modeling portion in a range of 0.4 to 1.5 mm in a direction orthogonal to the tangent line of the contour of the modeling portion.

  The coating film is preferably obtained by screen coating.

  The screen coating is preferably sequential coating using at least two types of masks.

  Furthermore, it is preferable to provide a colorless transparent or colored transparent coating layer on the back surface.

  The present invention forms a transparent resin having character-like, figure-shaped and / or symbol-like recesses on the back surface, provides a metal thin film on the back surface of the obtained transparent resin, and further applies a highly concealing paint to the recesses. By providing a modeling part for forming characters, figures and / or symbols having a metallic luster, removing the metal thin film provided in a part other than the modeling part on the back surface, in a shape along the shape of the modeling part, and , After using a mask larger than the modeling part on the back side, by forming a coating film on the convex part on the back side, a translucent part bordering the modeling part, and a main body having a lower light transmittance than the translucent part It is related with the manufacturing method of the base material for emblems characterized by providing a part.

  It is preferable that the coating film of the back surface convex part is obtained by screen coating.

  Since the base material for emblems of the present invention has a light-transmitting portion with high light transmittance formed on the outline of characters and figures with metallic luster, by irradiating light from the back surface to the surface using a light source By radiating bright light from the outlines of characters, figures, and symbols, it is possible to construct a highly decorative emblem in which characters, figures, etc. appear to float. In addition, the main body part other than the light-transmitting part also has a certain degree of light transmissivity, so that it is possible to make the pattern on the main body part stand out. An emblem base material that can be provided can be provided.

It is a figure which shows an example of the resin product which concerns on embodiment of this invention. It is a figure which shows the shape | molded transparent resin base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the transparent resin base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the injection | pouring part back of the base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the part with low pattern density after the 1st silk screen application | coating of the base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the part with high pattern density after the 1st silk screen application | coating of the base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance after performing only the solid coating by 2nd silk screen application | coating twice on the transparent resin base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the frame part after the blue clear coating of the base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of parts other than the frame after the blue clear coating of the base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the main-body part of the sample which apply | coated only the solid coating by 2nd silk screen application | coating once on the transparent resin base material which concerns on embodiment of this invention. It is a figure which shows the light transmittance of the main-body part of the sample which apply | coated only the solid coating by 2nd silk screen application | coating once on the transparent resin base material which concerns on embodiment of this invention, and applied the blue clear layer after that. It is a figure which shows the transparent resin base material shape | molded by the plane plate shape which concerns on embodiment of this invention.

  The present invention is not intended to cause uniform light scattering from the light emitting diodes only with the outer frame of characters, etc., as in the conventional shining emblem, but not only with the outer frame of characters, etc. By reducing the light concealment of parts that correspond to parts of the pattern other than parts such as characters from the viewpoint, and by making a difference in the light transmittance of each part, the base material for the emblem with a higher decorativeness can be obtained. For the purpose of provision.

  Therefore, in the method of the above-mentioned Patent Document 1 in which a light-emitting diode and a light guide plate are provided behind a resin plating material showing characters or the like and light scattering is made uniform, the present invention has a high decorative property. We thought that it would not lead to the provision of a luminescent emblem substrate.

  As an emblem for exterior use, unlike the emblem by resin plating described in Patent Document 1 described above, as shown below, a transparent resin base material using a resin typified by an acrylic resin, a polycarbonate resin, etc., An emblem having both a metal vapor-deposited thin film portion and other portions coated with a highly concealing coating has already been introduced on the market.

  About the example, material and a construction method are demonstrated below.

  First, molding using acrylic resin pellets is performed to create a transparent resin base material having an uneven surface. At this time, the substrate is basically plate-shaped, but the surface (= the opposite surface of the one surface having the unevenness) is flat or finished with a certain degree of curved surface. The form is required from the viewpoint of decorativeness, and from the viewpoint of ease of making the molding stage, it is not so much affected whether it is flat or curved.

  Thereafter, depending on the form of the product, the substrate may be annealed.

  The molded substrate is provided with a vacuum deposition process in order to adhere a metal thin film to the front and back surfaces. In this case, examples of the metal thin film include indium, tin, aluminum, nickel, chromium, and the like, but the most suitable general-purpose metal is aluminum because of cost advantages. By this step, the metal thin film adheres to the molded transparent resin substrate with a substantially uniform thickness.

  Hereinafter, a process in the case of using the most versatile aluminum as the metal thin film will be described.

  For the purpose of protecting the deposited aluminum thin film on the concave surface corresponding to the modeling part, which is the part of the emblem character, etc., at the stage where the aluminum thin film is attached to the entire surface of the transparent resin base material, and on this modeling part For the purpose of imparting concealability, the paint is applied only to the upper part of the aluminum thin film in the recess. In order to ensure concealment, the coating film needs to have a certain thickness. Therefore, as an application method, an injection method in which the coating material is poured directly into the recessed portion is optimal.

  After confirming that the paint has dried, in order to leave only the deposited aluminum film that exists under the coating of the recess, the portion where the aluminum is exposed is diluted with dilute sodium hydroxide solution, acidic ammonium fluoride. Aluminum is dissolved by immersion in a solution or the like, and the transparent resin surface is re-expressed again.

  Next, since it is a base material taking into account the decorative property of an emblem, silk screen coating is performed using a mask traced in a concavo-convex shape to give a pattern other than the concavo-convex portion of the concavo-convex surface. In the end, a paint with high concealment was used for the entire back surface for the purpose of further improving the quality of the base material by adding concealment and adding decorativeness other than the recesses. Apply paint. In this way, conventional emblems for exterior use are manufactured.

  In the form actually sold as an emblem, the uneven surface is the back surface. The emblem which passed through the above processes has already been put on the market like the emblem based on resin plating as described in Patent Document 1.

  The present invention focuses on this form. The uneven surface is the back surface as a product form. The surface is a transparent resin typified by an acrylic resin and the like, and has good decorativeness. Since this is the surface, high scratch resistance is also imparted. The focus was on the uneven surface as the back surface, and when viewed from the front side, the metal thin film and silk screen coated part at the boundary between the concave part and the convex part that is the other part, and its upper layer The finished part has a highly concealed paint part, but it is continuously connected, although the materials are different.

  Since the boundary between the concave portion and the convex portion that is the other portion corresponds to the outline of a character or the like, it is nothing but the shape portion that is originally desired to be emphasized. If it is possible to make this part a transparent frame, it is possible to secure the part of the shape that is originally emphasized, and for example, by attaching a sheet-like light guide plate to the entire back surface of the emblem base material and causing it to emit light. Therefore, it was thought that it would be possible to provide a base material for an emblem that can constitute a shining emblem that is more advantageous in decoration than the shining emblem currently on the market.

  After intensive studies, the object of the present invention can be achieved by combining the base material for the emblem of the present invention that has undergone the following steps with, for example, a sheet-like light guide plate bonded to the entire back surface, and more decorative High shining emblem.

  The material and method of the novel high-quality emblem substrate of the present invention will be described below.

  First, using a transparent resin pellet, a transparent resin base material having an uneven surface is formed during molding. As for the shape of the transparent resin substrate, priority is given to decorativeness, but as described above, it may be flat or curved. Depending on the form of the transparent resin substrate, the substrate may be annealed in order to remove the distortion of the substrate.

  The molded transparent resin substrate is provided with a vacuum vapor deposition step in order to adhere an aluminum thin film to the front and back surfaces.

  Furthermore, at the stage of the transparent resin base material, for the purpose of protecting the aluminum thin film of the concave surface corresponding to the modeling part that is a part of the emblem character, etc., and for the purpose of imparting concealment to this modeling part, The paint is applied only to the upper part of the metal thin film in the recess. Since the coating film needs to have a certain thickness in order to ensure concealment, the paint here is applied by an injection method and dried.

  After confirming that the paint has dried, in order for the aluminum thin film to remain only in the recesses, the part where the aluminum vapor-deposited thin film is exposed on the surface is immersed in a dilute aqueous sodium hydroxide solution, acidic ammonium fluoride aqueous solution, etc. The metal component is melted and the transparent resin surface is developed again.

  Up to this point, there is no difference from the conventional method for manufacturing a base material for emblems. The subsequent steps correspond to the new process.

  Since it is a base material that wants to have superior decorative properties as a base material for emblems, it has undergone a process of applying paint by silk screen coating, which is traced to the contour shape of unevenness to give a pattern to the uneven surface In this first screen coating step in the present invention, a range slightly larger than the shape of the concave portion is masked, and the body portion which is a portion other than the masked portion also serves as a decoration. Screen coating is performed using a mask.

  Further, a second screen coating is applied for the purpose of providing concealment, not the purpose of providing the decorative property, using a mask that is slightly larger than the uneven shape. In this case, solid printing is preferable in this application so as to cover the entire body portion on the back surface. If the desired concealability cannot be ensured by a single application, the second screen application may be performed multiple times.

  Through these steps, when viewed from the surface of the emblem substrate, the portion of the boundary between the metallic gloss surface and the screen coating surface, that is, the modeling portion having a metal thin film corresponding to characters, etc., and the main body portion being the screen coating surface The translucent part, which is the part corresponding to the border of the character, that is, the character frame or the like, is in a transparent and colorless state.

  As the final finish, a final paint surface that is colorless and transparent or clear in color is applied. In the translucent portion corresponding to the above-described character frame or the like, a colorless and transparent continuous frame without a discontinuous portion or a clear continuous frame is formed although there is coloring. Other than this continuous frame, the part corresponding to the character (= modeling part) is highly concealed, and the main part corresponding to the pattern that is a part other than the character has a certain degree of concealment, but the character etc. Concealment is low compared to the molding part corresponding to.

  For example, by attaching a sheet-shaped LED light guide plate to the entire back surface of the new base material for the emblem that has undergone these new processes and causing it to emit light, strong light leaks out from the character frame at night. Since weak light leaks from the part such as the pattern, it is possible to obtain a highly decorative emblem that can understand the pattern.

  Examples of the sheet-like LED built-in light guide plate include a Lumi sheet manufactured by Kei Project Co., Ltd.

  In this way, it is possible to visually confirm the provision of a new shining emblem that cannot be realized with the currently shining emblem that is introduced in the market, that is, the appearance and quality of the outline and pattern of characters etc. It is also possible to provide a good shining emblem.

In the following, description will be given as an example of embodiments of the present invention, but the present invention is not limited to these embodiments unless contrary to the gist of the present invention. One form of the resin product of the present invention is shown in FIG.
The emblem base material 1 is provided with a modeling part 11 for displaying characters, figures, symbols and the like. In FIG. 1, the characters “UEHARA” are displayed. The modeling part 11 has a metallic luster by a metal thin film such as aluminum. Even if light is irradiated from the back surface side by coating a coating material having a higher concealment property, that is, a coating material having a low light transmittance, on the back surface of the emblem base material 1 from the metal thin film, No light leaks.

  A transparent portion 12 having a width of about 0.4 to 1.5 mm is formed in the contour portion of the modeling portion 11 along the contour of the modeling portion 11. When light is irradiated from the back side of the emblem base material 1, a relatively large amount of light is lost from the translucent part 12, so that the outlines of characters and the like constituting the modeling part 11 are conspicuous even at night. It will be.

  Moreover, the main body part 13 which is a part other than the modeling part 11 and the translucent part 12 is coated on either the front surface or the back surface, and has higher light transmission than the modeling part 11, and the translucent part. The light transmittance is lower than 12. A pattern is given to the main body 13, and by irradiating light from the back side, the pattern is raised and displayed even if not as much as the translucent part 12. By adjusting the light transmission relationship between the modeling unit 11, the light transmitting unit 12, and the main body unit 13 in this way, it is possible to determine the pattern of the main body unit 13 although the illuminance also decreases.

  The maximum value of the light transmittance of the shaped part 11 at a measurement wavelength of 380 to 700 nm is preferably 0.1% or less, and more preferably 0.05% or less. Moreover, 15-85% is preferable and the maximum value of the light transmittance of the translucent part 12 is more preferable, and 20-40%. The maximum value of the light transmittance of the main body 13 is preferably 0.2 to 6.5%, and more preferably 0.25 to 3.0%.

  The light transmittance is measured using, for example, an ultraviolet-visible near-infrared spectrophotometer (Shimadzu Corporation, UV-3100PC), scan speed: high speed, slit width: 3.0 nm, sampling pitch: Auto, measurement wavelength. : It can be measured under measurement conditions of 380 to 700 nm.

  The resin substrate is preferably a transparent resin substrate. Examples of the transparent resin include acrylic resin and polycarbonate resin. Among them, acrylic resin (particularly polymethyl methacrylate resin) is used because it has higher chemical resistance and higher weather resistance than polycarbonate. More preferred.

  Since the base material of the present invention has a strong meaning of imparting decorative properties, such as a vehicle emblem, the shape of the base material after resin molding is basically a plate shape, but the surface has no curved surface. There are various types such as a shape or a case with a slight curved surface.

  However, it is preferable that one side is always formed so as to be a base material having one or a plurality of sites with unevenness. Therefore, the base material for a sheet-like or film-like product which is the same resin base material is different from the base material of the present invention. As a product form, it is preferable that the uneven surface is the back surface in terms of decorativeness, high scratch resistance, and difficulty in variation in the performance of the manufactured product.

  On this transparent substrate, a metal thin film such as indium, tin, aluminum, nickel, chromium, etc. is vacuum-deposited, sputtering, ion-plating, counter-heating deposition, high-frequency induction heating deposition, electron beam heating deposition. It vapor-deposits by general vapor deposition methods, such as. As a metal used in this case, aluminum is most preferable from the viewpoint of versatility and cost, and a vacuum deposition method is most preferable as a method for forming the thin film.

  The thickness of the deposited aluminum thin film is preferably 30 to 100 μm, and more preferably 50 to 80 μm. If it is less than 30 μm, the solvent component of the injection coating, which is a subsequent process, permeates the vapor-deposited aluminum film and permeates the transparent resin substrate. Due to the influence, the resin base material has melted, or when observed from the surface, the portion where the solvent component has permeated appears cloudy. Otherwise, it becomes a silver-like mirror surface, and the base material feels uncomfortable. In this way, the possibility of becoming an unfavorable product from the viewpoint of decorativeness increases. A film thicker than 100 μm is not preferable from the viewpoint of yield in producing a product because the possibility that a metal peeling residual phenomenon occurs after the peeling process, which is a subsequent process, is increased.

  At this stage where the aluminum vapor deposition process has been performed on the transparent base material, the aluminum thin film covers not only the uneven portions of the base material but also the entire front and back surfaces of the base material with a uniform thickness.

  Next, a highly concealed pouring paint is poured into the concave portion 14 of the uneven surface using an pouring device as appropriate.

  The injection paint in this case is preferably a so-called one-part paint from the viewpoint of covering the deposited aluminum film on the inner wall and bottom of the recess first, and reproducibility during production and pot life of the coating liquid. For solidification of the paint poured into the recess 14, natural drying at room temperature is preferable.

  The purpose of this pouring paint is to conceal the aluminum thin film underneath it, and at the same time to provide concealment, so a certain amount of thickness is required. Here, the thickness of the injecting paint is the thickness at the middle part of the recess 14, and it is necessary that the solidified component of the injecting paint adheres to the inner wall part at the inner wall part of the recess 14. is there.

  The injection paint is thicker than the vicinity of the center of the recess 14 near the inner wall at the injection stage due to the influence of surface tension. The natural drying at room temperature mentioned above causes the solvent component in the paint to evaporate over time. Although it solidifies after that, conveniently, the dried paint remains on the inner wall portion, and inside the concave portion 14, the film thickness is about the thickness of the middle portion of the concave portion 14 described above. .

  In the examples and the like to be described later, blend formulations of this injection coating are shown. From the viewpoint of concealment, the thickness is preferably 100 to 150 μm, more preferably 110 to 130 μm. If the thickness is less than 100 μm, the film thickness is insufficient from the viewpoint of concealment, or the exposed aluminum part may not be completely covered with the aluminum part existing on the inner wall part. There is a risk that it will not. If the thickness is greater than 150 μm, the coating liquid must be injected more than the depth of the inner wall of the recess 14, and the solidified portion of the injected paint that is desired to exist only in the recess 14 leaks in addition to the recess 14. This is not preferable from the viewpoint of productivity.

  As described above, in the recess 14, there is a concealed coating film that always hides the aluminum thin film on the upper surface of the aluminum vapor deposited thin film. Since the concealing coating film causes the characteristic solidification behavior described above after injection, an appropriate depth exists also in the depth of the concave and convex portions, particularly the inner wall portion of the concave portion 14. The depth of this part is preferably 1.7 to 2.7 mm, more preferably 1.8 to 2.5 mm. If the thickness is less than 1.7 mm, the coating material can be injected only to such an extent that the concealing power is low. If the depth is greater than 2.7 mm, the concealing coating film has a sufficient thickness even though the concealing property is substantially sufficient. In order to solidify along the inner wall of the injection paint described in the above, it means that more paint than necessary is necessary, which is not preferable from the viewpoint of cost.

  The effect of making this part a preferable depth is to make use of the property of drying the aluminum coating thin film and the highly concealed paint existing in the upper layer, especially the paint described above on the inner wall of the highly concealed paint. .

  As described above, solidification of an uneven surface on the back surface of the transparent resin substrate, particularly an aluminum thin film typified by a metal thin film provided for the concave portion 14, and a highly concealed pouring paint present on the upper layer The optimal form of was described.

  The portion where aluminum is vacuum-deposited is the entire surface of the transparent resin substrate. However, in the present base material, the presence of aluminum deposited on the bottom of the recess 14 on the back surface and the inner wall is meaningless as a product, and aluminum other than these parts is a dilute sodium hydroxide aqueous solution or Then, it is dissolved using an acidic ammonium fluoride aqueous solution or the like and peeled off from the substrate. By passing through this peeling step, portions other than the aluminum thin film of the concave portion 14 on the back surface and the concealed coating film applied to the upper layer re-express the transparent resin surface immediately after molding.

  Next, a mask is applied to the concave portion 14 on the back surface with unevenness, and a silk screen coating is applied to the main body portion 13 other than the concave portion 14 in order to satisfy both decorativeness and concealment. Do.

  As described above, the silk screen coating is intended to impart two performances. Therefore, it is preferable to perform the silk screen coating using two or more masks using two or more types of paints. In any silk screen coating, so-called one-component paint is preferable from the viewpoint of reproducibility of physical properties of the coating liquid and pot life of the coating liquid.

  In order to provide high concealability, if a single silk screen application is insufficient, it may be applied multiple times.

  It is preferable that the mask shape with respect to the concave portion 14 on the back surface with unevenness is larger than the contour of the concave portion 14 by a width of 0.4 to 1.5 mm in a direction perpendicular to the tangent line of the contour. That is, the translucent part 12 is formed with a width of 0.4 to 1.5 mm along the contour of the modeling part 11 on the surface of the emblem base material and in a direction perpendicular to the tangent line of the contour of the modeling part 11. Preferably, it is formed with a width of 0.5 to 1.2 mm. When the width of the translucent portion 12 is less than 0.4 mm, the light leaking from the thin contour line is weak, or in some cases, the thin contour is not secured, and there is a portion where the injection paint and the silk screen paint in the recess 14 overlap. May occur. Since these are originally highly concealing paints, the discontinuity of the shining part is emphasized, and it may become a base material that is contrary to the object of the present invention and desires to have high decorativeness. On the other hand, when the width of the translucent part 12 is larger than 1.5 mm, the thickness of the light leaking from the light emitting part provided on the back surface is too thick, making it difficult to see the characters themselves, feeling a sense of incongruity in the character frame, etc. This is not preferable because it directly affects the quality of the decoration.

  In this upper layer, a colorless transparent or colored clear coating layer is provided on the entire back surface with unevenness. In addition to the outline portion of the character portion, the main body portion 13 that is a pattern portion that takes into account decorativeness such as figures and symbols is provided with a certain degree of concealment and light transmittance, so that the amount of light transmitted through the portion Can be strong or weak. Thereby, the base material for emblems with which the decoration property is further higher than before, and the manufacturing method thereof can be provided.

  The paint at this time is different from the paint used for the emblem that has been introduced to the market as described in Comparative Examples described later, and is characterized by being colorless and transparent or colored and clear. This coating layer also serves to impart scratch resistance, and a so-called two-component paint is preferable. Moreover, since a two-component paint is used, a simple spray coating is preferable as the coating method. By applying this clear paint after the silkscreen application, which is the previous step, this clear coating layer exists on the upper layer of the modeling part 11 which is a bare transparent base material part corresponding to the contoured part. Become.

  In addition, various color pigments can be used as the color pigment in the paint when the colored clear layer is provided. If the light emission color of the above-mentioned sheet-shaped LED built-in light guide plate is white, it means that the number of choices is increased from the viewpoint of the color variation of the leaked light, so that the decorativeness can be further improved.

  Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited to the following examples. In the following, “%” means “mass%”.

Example 1
Using a methyl methacrylate / methyl acrylate copolymer (hereinafter referred to as PMMA) having the following physical properties, PMMA was 245 (± 10) with an electric injection molding machine (S-2000I 100-B manufactured by FANUC CORPORATION). ) Heated to ° C., injection molding was performed at an injection speed of 82 (± 20) mm / s and an injection pressure of 105 (± 10) MPa, and the transparent resin substrate shown in FIG. 2 was molded.

  The basic physical properties of the PMMA used and the thermal properties and mechanical properties of the molded product obtained by molding this PMMA under the above conditions are as follows.

1. Basic physical properties Specific gravity: 1.19
Refractive index: 1.49
2. Thermal properties Linear expansion coefficient: 6 × 10 ⁻⁵ / ° C. (Test method ASTM D696)
Deflection temperature under load: 102 ° C (according to JIS K7191)
Mold shrinkage: 0.2-0.6%
3. Mechanical properties Tensile strength: 73 MPa (according to JIS K7162)
Bending strength: 108 MPa (according to JIS K7171)

  Fig.2 (a) is a figure which shows the back surface of a transparent resin base material, FIG.2 (b) is a figure which shows the cross section at the time of cut | disconnecting a transparent resin base material along a transversal direction. As shown in FIG. 2, the obtained transparent resin substrate 1a has a curved surface on the front surface and an uneven surface on the back surface. The concave portion 14 of the transparent resin substrate 1a is for constituting the character of the finally obtained emblem substrate. The obtained transparent resin substrate 1 had a maximum length in the longitudinal direction of 120 mm, a maximum length in the short direction of 60 mm, and a thickness (portion other than the concave portion 14) of 5.0 mm.

  Moreover, the light transmittance of the transparent resin substrate 1a was measured using an ultraviolet visible near infrared spectrophotometer (Shimadzu Corporation, UV-3100PC). The measurement was performed under the measurement conditions of scan speed: high speed, slit width: 3.0 nm, sampling pitch: Auto, and measurement wavelength: 380 to 700 nm. The results are shown in FIG.

  After molding the transparent resin substrate 1a, the molded substrate sufficiently cooled to room temperature was kept at 78 ° C. for 2.5 hours in a thermal oven for the purpose of removing distortion. Vacuum deposition was performed on the back surface of the transparent resin substrate 1a subjected to the annealing treatment, using aluminum as a target metal so that the thickness of the deposited thin film was about 60 μm. The vacuum deposition apparatus used is EBA-2000 manufactured by ULVAC, Inc. The conditions for forming the aluminum thin film were as follows.

Target metal: Aluminum purity 99.99% or more Degree of vacuum: 0.03 Pa or less Argon gas flow rate: 90 sccm

  The thickness of the aluminum thin film was measured using a fluorescent X-ray analyzer (manufactured by JEOL Ltd., JSX-3100R2) and confirmed to be 60 μm as intended.

Next, an injection paint was prepared using the following paint.
<Injection paint blend formula>
(1) Paint main liquid xylene 40.0%
Ethylbenzene 20.0%
Methyl ketoxime 3.0%
Mineral Spirit * 1 3.0%
Carbon black * 2 5.0%
Modified alkyd resin 28.0%
Cobalt naphthenate 0.2%
Manganese naphthenate 0.8%
Total) 100.0%
* 1 Mineral Spirit: Cas No. 8052-41-3
* 2 Carbon Black: Cas No. 1333-86-4

(2) Diluted thinner low boiling point aliphatic naphtha * 3 55.0%
Mineral spirit * 1 45.0%
Total) 100.0%
* 3 Low boiling point aliphatic naphtha: Cas No. 64742-89-8

  As described above, after adjusting the paint main liquid and dilution thinner, blending is performed so that the mass ratio of the paint main liquid / dilution thinner is 10.0 / 1.8, and the mixture is sufficiently stirred, so that the injection paint is obtained. As completed.

  This injection paint is poured into the concave portion 14 on the back surface of the transparent resin base material on which the aluminum is vapor-deposited, using a dedicated injector material, to the full height of the inner wall of the concave portion 14, and at room temperature for 12 hours. Let dry naturally. The thickness of the dried paint near the center of the recess 14 was 100 μm. It was confirmed that a dry paint component adhered to the entire inner wall of the recess 14.

  The emblem base material has no meaning as a product if there is deposited aluminum other than the concave portion 14 on the back surface and the inner wall of the concave portion 14, so it is necessary to peel off the deposited aluminum attached to other portions. In order to peel the deposited aluminum, the following acidic ammonium fluoride aqueous solution was stirred and prepared at room temperature. In addition, in the acidic ammonium fluoride aqueous solution, a powdery thing was not able to be confirmed, but it confirmed visually that acidic ammonium fluoride was melt | dissolving completely.

<Aqueous ammonium fluoride solution>
10000g of pure water
210 g of ammonium ammonium fluoride

  While bubbling air into this acidic ammonium fluoride aqueous solution, the base material on which the above-mentioned pouring paint was dried was introduced, and an aluminum dissolution step was performed for 5 minutes. After 5 minutes, the sample was taken out, washed with pure water, dried, and then visually confirmed that the original transparent resin base material was re-expressed except for the back surface concave portion 14 and the inner wall portion as intended. About this sample, the light transmittance of the back of the injection | pouring part which inject | poured the injection coating was measured on the same conditions as the transparent resin base material mentioned above. The measurement results are shown in FIG.

  Next, a transparent portion is printed again on the curved surface of the base material for the purpose of imparting decoration and high concealment to the portion other than the concave portion 14 on the back surface of the base material that appears on the surface. Silk screen printing is performed by applying a mask made of polyester fiber and a photosensitive emulsion solution that can follow the shape of the surface.

  As described above, the silk screen printing is preferably performed twice or more by using two or more masks in order to impart a decorative property and high concealing performance.

  When performing silk screen printing, T-20E manufactured by Navitas Co., Ltd. equipped with a silk screen printing machine and a system enabling silk screen printing was used. Using this apparatus, the concave portion 14 is masked and concealed using a mask that is compared with the size of the concave portion 14 on the back surface corresponding to the modeling portion 11 such as characters, and the main body portion 13 is also decorative. A silk screen was applied using a mask capable of forming a pattern in view of the above.

  A first silk screen application was applied to give decorativeness. As an example of the pattern, silk screen coating using a mask that gives a lattice pattern was performed. The ink used for the first silk printing was composed of the following materials.

<Ink 1: Blue>
Xylene 2.0%
1,3,5-trimethylbenzene 3.0%
1,2,4-trimethylbenzene 9.0%
Methanol 2.0%
Cyclohexanone 40.0%
Isophorone 7.0%
Ethylene glycol monobutyl ether 27.0%
Vinyl acetate * 4 3.0%
Copper phthalocyanine blue 7.0%
Total) 100.0%
* 4 Vinyl acetate: Cas No. 108-05-4

<Ink 2: Violet>
Xylene 2.0%
1,3,5-trimethylbenzene 4.0%
1,2,4-trimethylbenzene 8.0%
Methanol 2.0%
Cyclohexanone 40.0%
Isophorone 7.0%
Ethylene glycol monobutyl ether 26.0%
Vinyl acetate * 4 3.0%
CZ Pigment Violet 8.0%
Total) 100.0%

<Ink 3: Silver paste>
Toluene 5.0%
1,3,5-trimethylbenzene 10.0%
Trimethylbenzene (mixture) * 5 15.0%
Mineral Spirit * 1 56.0%
Acrylic acid polymer 6.0%
Evaporated aluminum pigment 8.0%
Total) 100.0%
* 5 Trimethylbenzene (mixture): Cas No. 2555-1-13-7

The ink described above was formulated as follows.
Ink 1 65.0%
Ink 2 30.0%
Ink 3 5.0%
Total) 100.0%

  About the sample which performed this 1st silk screen application | coating, the light transmittance of the location with a low pattern density and the location with a high pattern density was measured on the same conditions as a transparent resin base material. The measurement results are shown in FIGS. 5 and 6, respectively.

  Next, the second silk screen printing was performed for the purpose of imparting high concealability. Solid printing was performed on the entire main body 13 on the back surface of the base material including the lattice pattern portion applied first. The ink used for the silk screen printing was composed of the following materials.

<Ink 4: Blue>
Cyclohexanone 20.0%
1,3,5-trimethylbenzene 2.5%
Trimethylbenzene (mixture) * 5 9.0%
Isophorone 9.0%
Copper phthalocyanine blue 7.5%
Vinyl acrylic resin 35.0%
Isobutyl acetate 17.0%
Total) 100.0%

<Ink 5: Black>
Xylene 3.0%
1,3,5-trimethylbenzene 7.0%
1,2,4-trimethylbenzene 5.0%
Methanol 3.0%
Cyclohexanone 30.0%
Isophorone 27.0%
Vinyl acetate * 4 6.0%
Carbon black * 2 19.0%
Total) 100.0%

<Ink 6: Ruby Red)
1,3,5-trimethylbenzene 3.5%
1,2,4-trimethylbenzene 3.5%
Cyclohexanone 16.0%
Isophorone 10.0%
Vinyl acrylic resin 35.0%
Ethyl acetate 17.0%
Gamma quinacridone 15.0%
Total) 100.0%

<Dilution thinner>
Naphthalene 20.0%
Cyclohexane 40.0%
Isophorone 40.0%
Total) 100.0%

  Each color ink and diluted thinner adjusted as described above were mixed at the following ratios to prepare silk screen ink.

Ink 4 (Blue) 70.0%
Ink 5 (black) 7.0%
Ink 6 (Ruby Red) 12.0%
Dilution thinner 11.0%
Total) 100.0%

  Regarding the second silk screen coating, the coating was repeated twice because the coating was not sufficient by only one coating. By repeating the application twice, the thickness of the application part on which the second silk screen application was performed was about 20 μm. As data indicating the change in light transmittance by this second silk screen coating, a sample was prepared by repeating only this second silk screen coating twice directly on the transparent resin substrate. The transmittance was measured by the same method as that for the transparent resin substrate. The results are shown in FIG.

  Next, as the final step for producing the emblem substrate, the entire back surface of the substrate was coated by a spray coating method. This coating film is a colored clear coating film as described above. The coating liquid formulation is described below.

<Main agent liquid>
Acrylic polyol 35.0%
Toluene 40.0%
Ethyl acetate 7.0%
Ethyl ethoxypropionate 3.0%
Methyl isobutyl ketone 3.0%
Copper phthalocyanine blue 4.0%
Vinyl acrylic resin 8.0%
Total) 100.0%

<Curing agent liquid>
Modified polyisocyanate * 6 27.5%
Toluene 32.0%
Xylene 4.0%
Ethyl acetate 32.5%
Propylene glycol monomethyl ether acetate 4.0%
Total) 100.0%
* 6 Modified polyisocyanate: Cas No. 28182-81-2

<Dilution thinner>
Toluene 25.0%
Ethylene glycol monoethyl ether acetate 20.0%
Ethyl acetate 30.0%
Methyl isobutyl ketone 25.0%
Total) 100.0%

The three liquids prepared in these were mixed in the following ratio.
Main agent solution 55.0%
Hardener liquid 15.0%
Dilution thinner 30.0%
Total) 100.0%

  The colored clear coating solution was uniformly applied by spray coating to the entire back surface having unevenness after the above-described silk screen coating. After coating, it was placed in a 75 ° C. heat oven for 90 minutes to cure the film. The film thickness was 22 μm. The emblem base material-1 of the present invention was obtained through the above steps.

  About this base material 1 for emblems, the transmittance | permeability was measured by the same method as the transparent resin base material mentioned above about the location which is transparent as a frame, and the location with the other high concealment property. The measurement results are shown in FIGS. 8 and 9, respectively.

(Example 2)
In Example 1, the same operation was performed except that a mask having a size 0.4 mm larger than the width of the character part was used as a mask to obtain an emblem base material-2 of the present invention.

(Example 3)
In Example 1, the same operation was carried out except that a mask having a size 1.5 mm larger than the width of the character part was used as a mask to obtain an emblem base material-3 of the present invention.

Example 4
In Example 1, a transparent resin base material was produced in the same manner as in the case of molding the transparent resin except that the base material was molded into the shape shown in FIG. Fig.12 (a) is a figure which shows the back surface of a transparent resin base material, FIG.12 (b) is a figure which shows the cross section at the time of cut | disconnecting a transparent resin base material along a transversal direction. As shown in FIG. 12, the obtained transparent resin substrate 1a has a flat plate shape on the front surface and an uneven surface on the back surface. The corners of the recesses 14 have the same finish as that of the emblem base material-1. The obtained transparent resin substrate 1a has a maximum length in the longitudinal direction of 120 mm, a maximum length in the short direction of 60 mm, a thickness (a portion other than the recess 14) of 5 mm, and a depth of the recess 14 of 2.5 mm. Met. Thereafter, the same process as that of the emblem base material-1 was performed to obtain an emblem base material-4.

(Example 5)
In Example 1, in the second silk screen coating, the same operation was carried out except that the coating was performed once to obtain an emblem base material-5. In the second silk screen coating, the coating thickness at the stage of once coating was 13 μm. In this emblem substrate-5, only the second silk screen coating is directly applied on the transparent resin substrate as data indicating the change in the light transmittance due to the second silk screen coating applied once. A sample applied once was prepared, and the transmittance of the main body was measured for this sample in the same manner as the transparent resin substrate described above. The results are shown in FIG. About this sample, the transmittance | permeability of the main-body part was measured about what applied the colored clear coating liquid in Example 1 by the method similar to Example 1 from the 2nd silk screen application | coating of once application | coating. The results are shown in FIG.

(Example 6)
In Example 4, in the second silk screen application, the same operation was carried out except that the application was performed once to obtain an emblem base material-6. The coating thickness at the stage of one silk screen coating was 13 μm.

(Example 7)
In Example 1, the same operation was carried out except that the annealing step that was performed before the step of depositing aluminum was not performed, thereby obtaining an emblem base material-7. The introduction of the annealing process is originally intended to eliminate distortion of the molded product. About this base material, the base material for 10 emblems was produced on the same conditions. Although these substrates were also observed from the viewpoint of distortion, it was confirmed that 9 out of 10 substrates were less distorted and were within specifications.

(Example 8)
In Example 1, the same operation was performed except that the main agent liquid constituting the outermost layer coating material was changed to the following and spray coating was performed.

<Main agent liquid>
Acrylic polyol 35.0%
Toluene 48.0%
Ethyl acetate 11.0%
Ethyl ethoxypropionate 3.0%
Methyl isobutyl ketone 3.0%
Total) 100.0%

  Basically, it is replaced with a solvent except for the pigment and dispersion aid that are colored blue. The ratio which comprises a coating material was mixed by the following ratios similarly to Example 1, the final coating of the back surface was finished by the method similar to Example 1, and the base material-8 for emblems was obtained.

Main agent solution 55.0%
Hardener liquid 15.0%
Dilution thinner 30.0%
Total) 100.0%

(Comparative Example 1)
In Example 1, the same operation was performed except that the thickness of the aluminum deposited film was 25 μm. In the stage where the peeling process after pouring and injecting the injecting paint was completed, when viewed from the front, it was cloudy at the part corresponding to the letters etc. (= the solidified component of the injecting paint exists in the rear part) Symptoms were observed. Although N = 3 was observed, since all the samples showed the same symptom, the subsequent steps were stopped for this base material (emblem base material-9).

(Comparative Example 2)
In Example 1, the same operation was performed except that the thickness of the aluminum vapor deposition film was changed to 110 μm. After the stripping step, aluminum was observed as a stripped residue in a place where aluminum originally does not want to remain. The same was true for N = 3. The immersion time in the dissolution process was extended from 5 minutes to 20 minutes, but there were still two remaining peelings with 2 out of N = 3. Although further extension of the dipping time was considered, it was related to productivity. At this stage, this sample was judged to be NG, and production was stopped (emblem substrate-10).

(Comparative Example 3)
In Example 1, the same operation was performed except that the injection paint was injected 1 mm shallower than the corner of the inner wall when the injection paint was injected. In the stage of natural drying at room temperature for 12 hours, the paint adhering to the inner wall was found to be shallower than 1 mm depending on the part. Except this, the base material 11 for emblems was produced through the same process as Example 1.

(Comparative Example 4)
In Example 1, the same operation was performed except that a larger amount was injected than in Example 1 when the injection paint was injected. The liquid level was an amount corresponding to the height of the concave surface. In this case, when the sample was moved to be naturally dried, the coating material was filled in the concave portion 14, so that it often leaked out of the concave portion 14 (behavior 1). However, there is a case where it can be moved without being leaked, and in that case, the subsequent natural drying at room temperature and 12 hours have passed. After 12 hours, the dried film also had a portion that protruded beyond the recess 14 (behavior 2). Thus, since the behaviors 1 and 2 were seen, it was judged that this base material was not appropriate at this stage, and the subsequent production steps were stopped (emblem base material-12).

(Comparative Example 5)
In Example 1, the same operation was carried out except that the mask used for the first silkscreen application was 0.2 mm larger than the outline of the character, to obtain an emblem base material-13. .

(Comparative Example 6)
In Example 1, the same operation was performed except that the mask used for the first silkscreen application was 2.0 mm larger than the outline of the character, to obtain an emblem base material-14. .

(Comparative Example 7)
The same process is performed until the peeling process of the deposited aluminum in Example 1, but since the silk screen coating process is different, it is described below. Compared to the coating film applied in Example 1, this coating film by screen coating places importance on decorativeness and suppresses concealment rather.

<Ink 7: Blue>
Xylene 2.0%
1,3,5-trimethylbenzene 2.0%
1,2,4-trimethylbenzene 5.0%
Methanol 1.0%
Cyclohexanone 27.0%
Isophorone 7.0%
Ethylene glycol monobutyl ether 19.0%
Vinyl acetate * 4 2.0%
Vinyl acrylic resin 30.0%
Copper phthalocyanine blue 5.0%
Total) 100.0%

<Ink 8: Violet>
Xylene 2.0%
1,3,5-trimethylbenzene 2.0%
1,2,4-trimethylbenzene 5.0%
Methanol 1.0%
Cyclohexanone 27.0%
Isophorone 7.0%
Ethylene glycol monobutyl ether 19.0%
Vinyl acetate * 4 1.0%
Vinyl acrylic resin 30.0%
CI Pigment Violet 23 6.0%
Total) 100.0%

<Ink 9: Silver paste)
Toluene 5.0%
1,3,5-trimethylbenzene 10.0%
Trimethylbenzene (mixture) * 5 15.0%
Mineral Spirit * 1 56.0%
Acrylic acid polymer 6.0%
Evaporated aluminum pigment 8.0%
Total) 100.0%

  Each color ink prepared as described above was mixed at the following ratio to prepare a silk screen ink.

Ink 7 (Blue) 62.0%
Ink 8 (Violet) 30.0%
Ink 9 (silver paste) 8.0%
Total) 100.0%

  In the base material for emblem, the concave portion 14 is completely covered and masked using a mask that is shaped to match the size of the concave portion of the concave portion 14 corresponding to the character portion and the like, and the main body portion 13 also has a decorative aspect. Then, a silk screen was applied once using the ink prepared as described above using a mask capable of forming the same pattern as that of the substrate 1 for the emblem. The thickness of the silk screen application part was about 10 μm.

  Next, the entire back surface with unevenness, which is the final step of the emblem substrate in Comparative Example 7, was applied by a spray coating method. Unlike the colored clear coating film of the substrate 1 for emblem, this coating film was a coating layer that emphasized the viewpoint of improving the hiding property. The coating liquid formulation is described below.

<Main agent liquid>
Acrylic polyol 28.0%
Carbon black * 2 3.0%
Mica * 7 3.0%
Titanium oxide * 8 3.0%
Toluene 37.5%
Xylene 1.5%
Ethyl acetate 18.0%
Ethyl ethoxypropionate 3.0%
Isobutyl acetate 3.0%
Total) 100.0%
* 7 Mica: Cas No. 12001-26-2
* 8 Titanium oxide: Cas No. 13463-67-7

<Curing agent liquid>
Modified polyisocyanate * 6 27.5%
Toluene 32.0%
Xylene 4.0%
Ethyl acetate 32.5%
Propylene glycol monomethyl ether acetate 4.0%
Total) 100.0%

<Dilution thinner>
Toluene 25.0%
Ethylene glycol monoethyl ether acetate 20.0%
Ethyl acetate 30.0%
Methyl isobutyl ketone 25.0%
Total) 100.0%

The three liquids prepared in these were mixed at the following ratio to prepare a coating liquid.
Main agent solution 55.0%
Hardener liquid 15.0%
Dilution thinner 30.0%
Total) 100.0%

  The coating liquid was uniformly applied by spray coating to the entire uneven back surface of the emblem substrate after the above silk screen coating. After application, the film was cured by placing it in a 75 ° C. heat oven for 90 minutes. The film thickness was 22 μm. The emblem base material-15 was obtained through the above steps.

(Comparative Example 8)
In Example 1, the emblem substrate was completed without applying the outermost layer to which spray coating was applied. This emblem substrate is designated as emblem substrate-16.

In contrast to the emblem bases -1 to -8 in the above examples, the emblem base material 11 and the emblem base materials 13 to -16 in the comparative examples, a sheet-like white light-emitting LED is incorporated on the entire back surface with irregularities. The light guide plate (made by KEI Project Co., Ltd., Lumi Sheet) is pasted together, and the light is emitted in the dark room. Table 1 and Table 2 show.

  Thus, the base material for emblems of Examples 1 to 8 (emblem base materials -1 to -8) corresponding to the present invention is at least a light intensity of 2 as a shining emblem in combination with the LED light guide plate. It turns out that it is a base material excellent as a base material for emblems with high decorativeness which becomes a step.

  In addition, the copper phthalocyanine blue which is a blue pigment used for the colored clear layer in the emblem substrate-1 of Example 1 is replaced with a pigment dispersion showing another color, or other pigment dispersions for silk screen coatings. The luminescent emblem using the luminescent emblem substrate of the present invention can change the luminescent color by replacing the colored clear paint pigment with another color. Thus, the luminescent emblem base material of the present invention is an emblem base material capable of various color variations as a shining emblem in combination with the LED built-in light guide plate that emits white light.

DESCRIPTION OF SYMBOLS 1 Base material for emblems 1a Transparent resin base material 11 Modeling part 12 Translucent part 13 Main part (painting part)
14 recess

Claims (12)

It is a base material for emblems using a transparent resin,
A modeling part for forming letters, figures and / or symbols having metallic luster;
A transmissive part capable of transmitting light by trimming the modeling part;
It has a main body part other than the modeling part and the translucent part,
When the light transmittance from the back surface to the front surface of the emblem substrate in the light transmitting portion and the light transmittance from the back surface to the front surface of the emblem base material in the main body portion are measured at 380 nm to 700 nm, the light transmitting portion If the maximum value of the light transmittance was defined _{T 1max,} the maximum value of light transmittance in the main body portion and _{T 2max} of the formula (1):

The base material for emblems characterized by satisfy | filling. The base material for an emblem according to claim 1, wherein the width of the translucent part can be set in a range of 0.4 to 1.5 mm. The base material for emblems according to claim 1 or 2, wherein the modeling part has a metal thin film. The emblem substrate according to claim 3, wherein the metal thin film is vapor-deposited aluminum. The base material for emblems according to any one of claims 1 to 4, wherein the shape is a flat plate shape or a curved plate shape. T _2max is _0.2 to 6.5%, the emblem substrate according to any one of claims 1 to 5. Forming a transparent resin having a letter-like, figure-like and / or symbol-like recess on the back surface,
By providing a metal thin film on the back surface of the obtained transparent resin, and further applying a highly concealing paint to the concave portion, a modeling part for forming characters, figures and / or symbols having metallic luster is provided,
Remove the metal thin film provided in the part other than the modeling part on the back,
After using a mask on the back surface in a shape that conforms to the shape of the modeling portion and larger than the modeling portion, a translucent portion that borders the modeling portion by forming a coating film on the back surface convex portion, and a transparent The manufacturing method of the base material for emblems characterized by providing the main-body part whose light transmittance is lower than an optical part. The method for producing a base material for an emblem according to claim 7 , wherein the coating film on the back surface convex portion is obtained by screen coating. The method of manufacturing an emblem substrate according to claim 8, wherein the screen coating is sequential coating using at least two types of masks. The emblem according to any one of claims 7 to 9, wherein the mask has a shape larger than the modeling part in a range of 0.4 to 1.5 mm in a direction orthogonal to a tangent to the contour of the modeling part. A method for producing a substrate. Furthermore, the manufacturing method of the base material for emblems in any one of Claims 7-10 obtained by providing a colorless transparent or colored transparent coating film layer in a back surface. When the light transmittance is measured at 380 nm to 700 nm, the maximum value of the light transmittance in the main body portion is 0.2 to 6.5%. The base material for an emblem according to any one of claims 7 to 11 Production method.

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