JPH10315383A - Soft brightened product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of a fissure in a metal thin film layer due to a stress, with enhanced reliability, to prevent lowering of the quality of external appearance and also to suppress delamination between the metal thin film layer and a top coat layer. SOLUTION: A radiator grille 1 is constituted of a base 2 made of polypropylene containing rubber, a base coat layer 3, a metal thin film layer 4 and a top coat layer 5. The metal thin film layer 4 is formed of chromium and, although the layer is visually recognized as a metal film macroscopically, it is recognized microscopically as a structure constituted of minute metal grains spread over and has grain boundaries 6. As for the top coat layer 5, the degree of swelling thereof is 100-150% and, besides, it is formed by compounding a silane coupling agent having a mercapto group with a high- ultraviolet absorber. Accordingly, an improvement in bonding power between the metal thin film layer 4 and the top coat layer 5 is attained and delamination between them is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft glittering product, and more particularly, to a soft glittering product whose base material is made of a deformable soft resin material and at least a part of the surface of which has a metallic luster. It is.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a soft luminous product 51 is generally made of a base material 5 made of, for example, polyurethane.
2, a base coat layer 53 formed on the base material 52, a metal thin film layer 54 formed on the base coat layer 53, and a top coat layer 55 formed thereon. The base coat layer 53 is provided mainly for forming a thin film formation surface into a mirror surface when the metal thin film layer 54 is formed, and the top coat layer 55 protects the metal thin film layer 54 and the like. It is provided for the purpose.

[0003] However, the soft brightening product 51
However, since the metal thin film layer 54 forms a continuous film, there is a possibility that the following problems may occur. That is, the soft luminous product 51 absorbs the stress by bending or deforming itself when originally receiving some stress. The base material 52, the base coat layer 53, and the top coat layer 55 among the constituent elements of the soft glitter product 51 can maintain their shapes even if they are actually deformed by receiving some stress. The original shape can be restored again with the release of the stress. However, the metal thin film layer 54 located between the base coat layer 53 and the top coat layer 55 could not follow the deformation, and as shown in FIG. . When such cracks are generated, the cracks are visually recognized as white streaks and the appearance quality is extremely low.

[0004] As a technique for solving such a problem,
For example, one disclosed in Japanese Patent Application Laid-Open No. 9-70920 is known. In this technique, the metal thin film layer is made of a metal having corrosion resistance, the thickness thereof is set to 150 ° or more and 800 ° or less, and further has a crystal grain boundary.

According to this technique, when a soft glittering product receives some stress, a substrate made of a soft resin material,
The base coat layer and the top coat layer can be deformed following the stress. For the metal thin film layer,
Since it has its own crystal grain boundaries, even if stress is applied, the adjacent metal grains (metal grains) are shifted or the distance between them is widened, so that the metal constituting the metal thin film layer It is hardly stressed by itself. Also, macroscopically, by the fine metal constituting the metal thin film layer,
It can be visually recognized as a planar metal film. Furthermore, in the above technique, since the metal thin film layer has corrosion resistance, there is no need to worry about corrosion or the like. As a result, it is possible to more reliably suppress the occurrence of cracks in the metal thin film layer due to stress,
As a result, a decrease in appearance quality can be prevented.

On the other hand, when a soft glitter product is used, for example, as an exterior product, a coating is often applied on the top coat layer of the soft glitter product.

[0007]

However, the above prior art has the following problems. That is, the base coat layer and the top coat layer are made of a paint, that is, a resin material, whereas the metal thin film layer is made of a metal literally. For this reason, the bonding strength between the metal thin film layer and the top coat layer was sometimes insufficient. Further, when the top coat layer of the soft glittering product is further coated, the solvent contained in the paint may cause the top coat layer to swell. When the degree of the swelling is large, the bonding strength between the metal thin film layer and the top coat layer may be further reduced. As a result, there is a possibility that peeling may occur between the metal thin film layer and the top coat layer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a soft glittering product having a base material, a base coat layer, a metal thin film layer and a top coat layer, in which a metal is formed by stress. A soft brightening product that more reliably suppresses the occurrence of cracks in the thin film layer, prevents deterioration in appearance quality, and suppresses delamination between the metal thin film layer and the top coat layer. Is to do.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a base material made of a soft resin material and a base coat layer provided on at least a part of the surface of the base material are provided. A thickness of 150 ° or more, which is provided on at least a part of the surface of the base coat layer, is made of a metal having corrosion resistance, and has a crystal grain boundary.
に お い て In a soft brightening product comprising the following metal thin film layer and a top coat layer applied and formed so as to cover at least the metal thin film layer, the degree of swelling of the top coat layer is 100% or more and 150% or less. The gist of the present invention is that the top coat layer contains a silane coupling agent having a mercapto group. Here, the degree of swelling means the degree of volume swelling of the topcoat layer when the topcoat layer is immersed in an organic solvent and then dried.

[0010] Further, in the invention according to claim 2, in the soft glittering product according to claim 1, the gist is that the top coat layer further contains a high ultraviolet absorber. .

Further, in the invention according to claim 3, in the soft brightening product according to claim 1 or 2, the compounding amount of the silane coupling agent in the top coat layer is 1.2% by weight or more. The gist is that the content is 0.2% by weight or less.

According to a fourth aspect of the present invention, in the soft brightening product according to any one of the first to third aspects, the silane coupling agent having a mercapto group is γ-mercaptopropyltrimethoxysilane. The gist is that

Here, the thickness of the metal thin film layer needs to be 150 ° or more and 800 ° or less. If the thickness is less than 150 °, metallic luster may not be produced. If the thickness is more than 800 °, it is difficult to form a crystal grain boundary, and a continuous film without the crystal grain boundary may be formed.

(Function) According to the first aspect of the present invention, the metallic luster can be released by the metal thin film layer on the base coat layer provided on at least a part of the surface of the substrate made of a soft resin material. Further, the metal thin film layer can be protected by the top coat layer formed so as to cover at least the metal thin film layer.

In the present invention, when the soft glittering product receives some stress, the base material, the base coat layer and the top coat layer made of a soft resin material can be deformed following the stress. In addition, since the metal thin film layer itself has a crystal grain boundary, even if stress is applied, only the adjacent crystal grains (metal grains) are shifted or the distance between the two is widened. The metal constituting the metal thin film layer is hardly subjected to stress. Also,
Macroscopically, the fine metal constituting the metal thin film layer can be visually recognized as a planar metal film. Furthermore, in the present invention, since the metal thin film layer has corrosion resistance, there is no need to worry about corrosion or the like.

In addition, in the present invention, the degree of swelling of the top coat layer is 100% or more and 150% or less. Therefore,
The top coat layer has a high crosslinking density. Therefore, even when the top coat layer is coated and the solvent in the paint permeates the top coat layer, the bonding strength between the metal thin film layer and the top coat layer does not easily decrease. For this reason, peeling between the metal thin film layer and the top coat layer hardly occurs.

The top coat layer contains a silane coupling agent having a mercapto group. Therefore, the silane coupling agent bonds to the metal thin film layer and the top coat layer, and the bonding strength between the metal thin film layer and the top coat layer is improved.

Further, according to the invention described in claim 2,
In addition to the effect of the first aspect of the present invention, since the top coat layer contains a high ultraviolet absorber, the amount of ultraviolet light transmitted through the top coat layer is suppressed. Therefore, for example, even when the product is used for a long period of time, a decrease in the bonding strength between the metal thin film layer and the top coat layer is suppressed.

According to the third aspect of the present invention,
In addition to the effects of the invention described in claims 1 and 2, the amount of the silane coupling agent in the top coat layer is 1.2.
Since the content is not less than 3.2% by weight and not less than 3.2% by weight, the above-described action is more reliably achieved.

In addition, according to the fourth aspect of the present invention,
In addition to the effect of the invention according to claims 1 to 3, since the silane coupling agent having a mercapto group is γ-mercaptopropyltrimethoxysilane, the bonding strength between the metal thin film layer and the top coat layer is higher. Enhanced.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment in which the soft glitter product of the present invention is embodied in a radiator grill for an automobile will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a radiator grill 1 as a soft glitter product has a base material 2, a base coat layer 3 applied on the surface of the base material 2, and a base coat layer 3. Metal thin film layer 4 and a top coat layer 5 further applied thereon. The base material 2 is made of a rubber component (for example, ethylene-propylene).
And polypropylene containing a diene polymer component having a hydroxyl group (for example, manufactured by Mitsubishi Chemical Corporation)
FG5-1) by a known injection molding method. Therefore, a hydroxyl group (OH group) or the like is introduced as an adhesive component on the surface of the substrate 2. The base coat layer 3 is mainly composed of an acrylic urethane paint (for example, trade name: TG-B-2331 manufactured by Fujikura Kasei Co., Ltd.) and is baked at 110 ° C. for 90 minutes. It is “about 25 μm”. Further, the top coat layer 5 is formed of a urethane-based paint (for example,
It is formed by applying a material having TG-T-2287 (trade name, manufactured by Fujikura Kasei Co., Ltd.) as a main component and baking it at 70 ° C. for 70 minutes.
It has become. Further, the metal thin film layer 4 is made of chromium (for example, purity 99.99% manufactured by Kojundo Chemical Co., Ltd.).
The film thickness is formed to be about 400 °.

In this embodiment, the metal thin film layer 4
Is macroscopically visible as a metal film, but microscopically, it has a continuous (like neighboring metal particles in contact) tissue structure laid out with fine metal particles. Have. More specifically, the metal thin film layer 4 is formed by laying a large number of metal grains formed on the base coat layer 3, and a boundary between the metal grains is a so-called crystal grain boundary 6.

Next, a characteristic portion of the present embodiment will be described. In the present embodiment, the top coat layer 5
Has a degree of swelling (the degree of volume swelling of the top coat layer 5 when the organic solvent has penetrated) is 130%, and the crosslink density is high. In order to make the top coat layer 5 have a high crosslinking density, for example, a two-pack type acrylic polyol as a main agent and hexadimethylene isocyanate (HDI) as a curing agent are mixed into a paint for the top coat layer 5.

The top coat layer 5 contains 2.5% by weight of a silane coupling agent having a mercapto group (eg, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, etc.). . As a silane coupling agent having a mercapto group, it is particularly desirable to use γ-mercaptopropyltrimethoxysilane. Further, the top coat layer 5 contains 9% by weight of a high UV absorber (at least one of a benzotriazole UV absorber and a benzophenone UV absorber).

The radiator grill 1 constructed as described above is manufactured, for example, as follows. That is, first, the base material 2 having substantially the same appearance as the radiator grill 1 is formed by a known injection molding method. Further, the surface of the base material 2 is degreased and washed with isopropyl alcohol and the like, and air-dried. Next, a paint for the base coat layer 3 is applied so as to have a film thickness of “about 25 μm” and baked at a high temperature of 110 ° C. for 90 minutes. By this baking, a base coat layer 3 is formed on the surface of the substrate 2 as shown in FIG.

Subsequently, the substrate 2 on which the base coat layer 3 was formed was set in a known sputtering apparatus, and the initial vacuum degree was "6.0 × 10 ^-3 Pa" and the film formation vacuum degree (Ar gas pressure) was " 1.0 × 10 ⁻¹ Pa ”or“ 5.0 × 10 ⁻² Pa ”
The sputtering with chromium is performed under the condition of “Pa”. Note that the voltage at this time is “550 V” and the current is “8
0A ". Then, as shown in FIG. 4, on the base coat layer 3, the metal thin film layer 4 having the above-mentioned crystal grain boundaries 6 (crystal average size: 100 ° or less) is formed.

Thereafter, a coating material for the top coat layer 5 is applied so as to have a thickness of about 25 μm,
Bake for 0 minutes. By this baking, a top coat layer 5 is formed on the metal thin film layer 4 as shown in FIGS. After the completion of baking, the radiator grill 1 described above is obtained by being left at room temperature for one day.

Next, the operation and effect of this embodiment will be described. (A) Radiator grill 1 configured as described above
According to this, when the radiator grill 1 itself receives some stress from the outside, as shown in FIG. 5, the base material 2 made of a soft resin, the base coat layer 3 and the top coat layer 5
It can be deformed following the stress. Further, the metal thin film layer 4 itself has a crystal grain boundary 6, so that
Even if such a stress is received, the metal constituting the metal thin film layer 4 is hardly subjected to the stress only by expanding the space between adjacent crystal grains. Therefore, there is no possibility that a crack is generated in the metal thin film layer 4. Therefore, it is possible to reliably prevent the appearance quality from deteriorating due to the occurrence of cracks in the metal thin film layer 4 due to the deformation. In order to confirm this effect, the operation of bending the radiator grill 1 90 ° along a round bar having a diameter of 25 mm (with the metal thin film layer 4 and the like outside) was repeated 10 times, and the appearance was visually evaluated. As a result, no defect was recognized.

(B) When viewed microscopically, although the metal thin-film layer 4 is composed of fine metal particles, macroscopically, a flat surface is formed by the aggregation of the fine metal particles. It can be visually recognized as a metal film. In other words, even in the case of the configuration as in the present embodiment, as far as the naked eye normally looks, it can be visually recognized in the same manner as a conventional ordinary metal thin film. Therefore, by adopting the configuration of the present embodiment,
The appearance quality is not inferior to that of the prior art (one continuous film) (visible light reflectance: 55%).

(C) Further, in this embodiment, since the metal thin film layer 4 is made of chromium having corrosion resistance, there is no need to worry about corrosion and the like, and the corrosion as shown in the prior art occurs. It will be difficult. In particular, in the present embodiment, since the metal thin film layer 4 has the crystal grain boundaries 6, the conductivity between adjacent crystal grains is easily interrupted, and even if corrosion occurs partially, The propagation of the corrosion can be suppressed (the sheet resistance of the metal thin film layer 4 is 10
kΩ / □).

(D) In the present embodiment, particularly, the degree of swelling of the top coat layer 5 is 130%, and the crosslink density is high.
Therefore, even when the top coat layer 5 is coated and the solvent in the paint permeates the top coat layer 5, the top coat layer 5 does not easily swell. Therefore, the bonding strength between the metal thin film layer 4 and the top coat layer 5 is not easily reduced. As a result, peeling between the metal thin film layer 4 and the top coat layer 5 can be suppressed.

Here, the following experiment was conducted in order to confirm the effect of the above (d). That is, first, various paints for the top coat layer are used, and thereby various top coat layers are individually formed. Then, those top coat layers were immersed in a solvent (chloroform) at room temperature for 10 minutes, and then dried. Thereby, various swelling degrees (100, 110, 120, 130, 140, 15)
(0,160%). Then, after sputtering was performed on the base coat layer on the base material to form a metal thin film layer, the top coat layers having the various swelling degrees described above were formed on the metal thin film layer.
Then, coating was performed on various top coat layers, and the adhesion between the metal thin film layer and the top coat layer at this time was evaluated. Table 1 shows the results. In the table, the peeling test results are those evaluated by the following test method,
○ indicates that no peeling occurred, and X indicates that any peeling occurred.

First, two straight cuts are made in the coated top coat layer with a cutter knife until they reach the base material. In this case, another cut is made so as to intersect one straight line at an angle of about 30 degrees. As a result, a cut is formed in the top coat layer to determine a peeled state.

Then, after the pressure-sensitive adhesive tape is pressed on the top coat layer having the cuts, the pressure-sensitive adhesive tape is quickly peeled off. At this time, the adhesion between the metal thin film layer and the top coat layer was evaluated based on whether or not the coated top coat layer was peeled off at all.

[0036]

[Table 1] As shown in Table 1 above, the degree of swelling of the top coat layer was 10
When the content is 0% or more and 150% or less, it can be seen that high bonding strength between the metal thin film layer and the top coat layer is maintained even if the solvent permeates the top coat layer. On the other hand, when the degree of swelling of the top coat layer exceeds 150%, it can be seen that separation between the metal thin film layer and the top coat layer easily occurs.

(E) According to the present embodiment, a silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) is used as the silane coupling agent. For this reason, the silane coupling agent is mutually bonded to the metal thin film layer 4 and the top coat layer 5, and the bonding strength between the metal thin film layer 4 and the top coat layer 5 can be improved. Delamination between the thin film layer 4 and the top coat layer 5 can be suppressed.

Here, in order to confirm the above effects, the effectiveness of blending a predetermined amount of a silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) into the top coat layer 5 was confirmed. That is, after forming a metal thin film layer by performing sputtering on the base coat layer, a top coat layer was prepared by mixing 2.5% by weight of a silane coupling agent having various functional groups on the metal thin film layer. . At this time, the adhesion between the metal thin film layer and the top coat layer was evaluated. Table 2 shows the results. In the table, the test results are based on the Goban peel test (JI
S D02024 ・ 15), and ○ indicates that none of the 100 locations was peeled off.
Δ indicates that peeling occurred at less than 5 places, and X indicates that peeling occurred at 5 or more places.

[0039]

[Table 2] As shown in Table 2 above, it can be seen that the addition of the silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) ensures a high bonding strength between the metal thin film layer and the top coat layer. . In addition, even when a silane coupling agent having a functional group (amino group, vinyl group, chloro group) other than the mercapto group was blended, a bonding strength as high as that of the mercapto group could not be obtained.

(F) Further, according to the present embodiment, the top coat layer 5 contains 2.5% by weight of a silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane). I have. For this reason, the bonding strength between the metal thin film layer 4 and the top coat layer 5 can be more reliably improved, and as a result, delamination between the metal thin film layer 4 and the top coat layer 5 can be more reliably suppressed. it can.

Here, in order to confirm the above-mentioned effects, the top coat layer and the metal thin film layer when the film was formed by changing the compounding ratio of the silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) in various ways. Was evaluated by the Goban peel test in the same manner as described above.
Table 3 shows the results.

[0042]

[Table 3] As shown in Table 3, when the blending ratio of the silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) is 1.2% by weight or more and 3.2% by weight or less, the metal thin film layer Although a high bonding force between the top coat layer and the top coat layer is obtained, a decrease in the bonding force is observed in other ranges.

(G) In addition, in the present embodiment, the top coat layer 5 contains a high ultraviolet absorber. For this reason, the amount of ultraviolet light transmitted through the top coat layer 5 is suppressed. Therefore, for example, even when the radiator grill 1 as a product is used for a long period of time, a decrease in the bonding force between the metal thin film layer 4 and the top coat layer 5 is suppressed, and the metal thin film layer 4 and the top It is possible to further suppress delamination between the coat layers 5.

Here, the following test was conducted in order to confirm the effects of the above (g). That is, the bonding strength between the top coat layer and the metal thin film layer when the blending amount of the high ultraviolet absorber was changed variously was evaluated. Conducted) and the appearance quality was also evaluated. Table 4 shows the results.

[0045]

[Table 4] As shown in Table 4 above, it can be said that the weather resistance is improved by blending the high ultraviolet absorber. In particular, it can be seen that by adding 6% by weight or more, a high bonding strength between the metal thin film layer and the top coat layer can be maintained.

However, when the blending amount of the high ultraviolet absorber is too large, specifically, when blending is 12% by weight or more, a high bonding force between the metal thin film layer and the top coat layer is maintained. Although it can be done, the top coat layer is colored yellow, and in this sense, the appearance quality is affected.

From these facts, it is considered that the blending amount of the high ultraviolet absorber is desirably 6% by weight or more, and considering the appearance and the like, less than 12% by weight is considered appropriate. (Second Embodiment) Next, a second embodiment of the present invention will be described. However, in the configuration and the like of the present embodiment, portions that are the same as those in the above-described first embodiment are given the same reference numerals, and descriptions thereof are omitted. The following description focuses on the differences from the first embodiment.

As shown in FIGS. 6 and 7, the present embodiment differs from the first embodiment in the method of forming the metal thin film layer 11. That is, also in the present embodiment, the metal thin film layer 11 is formed of chromium so as to have a thickness of about “about 400 °”, and can be visually recognized as a metal film macroscopically. Visually, it has a continuous texture structure of fine metal particles. That is, the metal thin film layer 11 is
A large number of metal grains formed thereon are laid all over, and a boundary between the metal grains is a so-called crystal grain boundary 12.

The radiator grill 1 configured as described above is manufactured, for example, as follows. That is, first, the base material 2 is formed and the base coat layer 3 is formed as described above. However, in the present embodiment, a paint having the same composition as that of the first embodiment is used as the paint for the base coat layer 3, and the paint is applied so as to have a film thickness of “about 15 μm”. The base coat layer 3 is formed by baking at a high temperature for 90 minutes.

Subsequently, the base material 2 on which the base coat layer 3 is formed is set in a known vacuum vapor deposition apparatus, and chromium is vapor-deposited at an initial vacuum degree of “2.0 × 10 ⁻³ Pa”.
The vacuum deposition rate at this time is, for example, “1.0 °
/ Sec ". Then, on the base coat layer 3, the metal thin film layer 11 having the above-described crystal grain boundaries 12 (crystal average size: 200 °) is formed.

Thereafter, the paint for the top coat layer 5 (first paint)
Is applied to a film thickness of “about 20 μm” and baked at a high temperature of 70 ° C. for 70 minutes. By this baking, the top coat layer 5 is formed on the metal thin film layer 11.
Is formed. After the completion of baking, the radiator grill 1 described above is obtained by being left at room temperature for one day.

The radiator grill 1 thus configured also basically has the same function and effect as the first embodiment (the sheet resistance of the metal thin film layer 11 is 250 kΩ / □). Before and after).

It should be noted that the present invention is not limited to the above-described embodiments, and may be implemented as follows by appropriately changing a part of the configuration without departing from the spirit of the invention. (1) In each of the above embodiments, as the high ultraviolet absorber,
Although a benzotriazole-based UV absorber and a benzophenone-based UV absorber were used, any high-UV absorber having an excellent UV-absorbing ability may be used, for example, salicylic acid-based UV absorber. And a cyanoacrylate ultraviolet absorber.

(2) In each of the above embodiments, the metal thin film layers 4 and 11 are embodied by chromium.
In addition, the metal thin film layer may be formed of various metal materials such as nickel, titanium, tantalum, aluminum, or an alloy thereof as long as the material has corrosion resistance.

(3) In each of the above-described embodiments, the sputtering method or the vacuum evaporation method is employed when forming the crystal grain boundaries 6 and 12 in the metal thin film layers 4 and 11. It is also possible to adopt a singing method or the like.

(4) In each of the above embodiments, the soft luminous product is embodied in the radiator grill 1 for an automobile, but other products, such as an automobile emblem,
It can also be embodied in exterior parts such as side moldings and various interior parts.

(5) In the above embodiments, the color tone of the substrate 2 and the like is not specified, but the substrate 2 and the like may be colored separately. The technical ideas which are not described in each claim of the claims but can be grasped from the above embodiment are described below together with their effects.

(A) The soft glittering product according to any one of claims 2 to 4, wherein the blending amount of the high ultraviolet absorber in the top coat layer is from 6% by weight to less than 12% by weight. And

By adopting such a configuration, it is possible to further suppress the delamination between the metal thin film layer and the top coat layer.

[0060]

As described above in detail, according to the soft brightening product of the present invention, in a soft brightening product having a base material, a base coat layer, a metal thin film layer and a top coat layer, a metal thin film layer is formed by stress. In addition, it is possible to more reliably suppress the occurrence of cracks in the metal layer, prevent the appearance quality from deteriorating, and suppress the delamination between the metal thin film layer and the top coat layer.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view schematically showing a radiator grill of a first embodiment.

FIG. 2 is a partially cutaway perspective view schematically showing a radiator grill.

FIG. 3 is a cross-sectional view of a base material and the like for explaining a method of manufacturing a radiator grill.

FIG. 4 is a cross-sectional view of a substrate and the like for explaining a method of manufacturing a radiator grill.

FIG. 5 is an enlarged cross-sectional view for explaining the operation of the first embodiment.

FIG. 6 is an enlarged cross-sectional view schematically illustrating a radiator grill according to a second embodiment.

FIG. 7 is a partially cutaway perspective view schematically showing a radiator grill.

FIG. 8 is a cross-sectional view schematically showing the structure of a conventional softening product.

FIG. 9 is a cross-sectional view for explaining a defect of a conventional softening product.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Radiator grill as a soft brightening product, 2 ... Base material, 3 ... Base coat layer, 4, 11 ... Metal thin film layer, 5 ...
Topcoat layer, 6, 12 ... grain boundaries.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sonoko Nishimoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yasutaka Hasegawa 1 Kasugamachi, Oshirochi, Nishi-Kasugai-gun, Aichi Prefecture Toyoda Gosei Co., Ltd. In-house (72) Inventor Yasuhiko Ogisu 1 Ochiai Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture Toyoda Gosei Co., Ltd.

Claims (4)

[Claims] A base material made of a soft resin material; a base coat layer provided on at least a part of the base material surface; and a base coat layer provided on at least a part of the base coat layer surface;
A soft glitter comprising a metal thin film layer having a crystal grain boundary and having a thickness of 150 to 800 mm and having a crystal grain boundary, and a top coat layer applied and formed so as to cover at least the metal thin film layer. The softened product, wherein the degree of swelling of the top coat layer is 100% or more and 150% or less, and the top coat layer is a composition containing a silane coupling agent having a mercapto group. Brightening products. 2. The soft glittering product according to claim 1, wherein the top coat layer further contains a high ultraviolet absorber. 3. The soft glitter according to claim 1, wherein the blending amount of the silane coupling agent in the top coat layer is 1.2% by weight or more and 3.2% by weight or less. Product. 4. The soft glittering product according to claim 1, wherein the silane coupling agent having a mercapto group is γ-mercaptopropyltrimethoxysilane.