JP3291242B2 - Soft brightening products - Google Patents

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. 9, 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. In other words, the soft luminous product 51 absorbs the external force by bending or deforming itself when originally receiving some external force. The base material 52, the base coat layer 53, and the top coat layer 55 among the constituent elements of the soft glittering product 51 are deformed by some external force even if they are actually deformed by the external force. Can be restored. However, the metal thin film layer 54 located between the base coat layer 53 and the top coat layer 55 cannot follow the deformation, and there is a possibility that a crack may occur in the metal thin film layer 54 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, it is disclosed in JP-A-9-70920. In this technique, the metal thin film layer is made of a metal having corrosion resistance and has a thickness of 150 ° or more and 8 mm or more.
The temperature is set to not more than 00 ° and further has a crystal grain boundary.

According to such a technique, when the soft glittering product receives some external force, a substrate made of a soft resin material,
The base coat layer and the top coat layer can be deformed following the external force. For the metal thin film layer,
Since it itself has a crystal grain boundary, even if it receives a stress caused by an external force, the adjacent crystal grains (metal grains) are shifted or the distance between the two is widened. Is hardly applied to the metal itself. Macroscopically, the fine metal constituting the metal thin film layer can be visually recognized as a metal film having a uniform surface. 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, the occurrence of cracks in the metal thin film layer due to stress can be more reliably suppressed, and thus the appearance quality can be prevented from lowering.

[0006]

However, the above prior art has the following problems. That is, the base coat layer and the top coat layer are made of paint, that is, a resin material, whereas the metal thin film layer is made of metal literally. For this reason,
In some cases, the bonding strength between the base coat layer and the metal thin film layer was insufficient. For this reason, when the soft glittering product is used and subjected to severe conditions or used for a long period of time, there is a possibility that peeling may occur between the base coat layer and the metal thin film layer.

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, wherein a metal is formed by stress. Provided is a soft glittering product that can more reliably suppress the occurrence of cracks in the thin film layer, can prevent the appearance quality from deteriorating, and can suppress delamination between the base coat layer and the metal thin film layer. It is in.

[0008]

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 base coat layer has a glass transition point of −30 ° C. or more and 0 ° C. with or less, all SANYO silane coupling agent having a mercapto group is blended, and the paint for forming the same base coat layer,
Paint component having 3 to 10 hydroxyl groups in one molecule
The gist is to contain .

Here, the thickness of the metal thin film layer needs to be 150 ° or more and 800 ° or less (the same applies hereinafter). Thickness 1
If it is less than 50 °, 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.

[0010]

Further, in the invention according to claim 2 , in the soft brightening product according to claim 1, the compounding amount of the silane coupling agent in the base coat layer is 0.8% by weight or more and 2.0% by weight. % Is the gist.

Further, according to the invention of claim 3 , in the soft brightening product of claim 1 or 2 , the silane coupling agent having a mercapto group is γ-
The gist is that it is mercaptopropyltrimethoxysilane.

(Operation) According to the first aspect of the present invention, the metallic luster can be emitted 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 external force, the base material, the base coat layer and the top coat layer made of a soft resin material can be deformed following the external force. In addition, since the metal thin film layer itself has a crystal grain boundary, adjacent crystal grains (metal grains) are shifted or the space between them is widened even when subjected to stress due to external force. The stress hardly acts on the metal constituting the metal thin film layer. Macroscopically, the fine metal constituting the metal thin film layer can be visually recognized as a metal film having a uniform surface. 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, according to the present invention, the base coat layer has a glass transition point of −30 ° C. or more and 0 ° C. or less.
Therefore, the base coat layer is relatively soft, and crystal grains (metal grains) constituting the metal thin film layer relatively easily pierce and penetrate the base coat layer. Therefore, the bonding strength of the metal thin film layer to the base coat layer is relatively high. In addition, cracks hardly occur in the base coat layer.

Further, the base coat layer contains a silane coupling agent having a mercapto group. For this reason, the bonding force between the base coat layer and the metal thin film layer is further increased.

[0017] In addition, the paint to form a base Sukoto layer,
Since one molecule contains a coating component having 3 to 10 hydroxyl groups, at least a hydroxyl group remains in the coating even when a reaction or the like occurs in the coating. For this reason, a polarity is generated in the coating by the hydroxyl groups remaining in the coating, and as a result, the base coat layer also has a polarity.
Then, since the metal thin film layer easily adheres to the surface of the base coat layer due to the influence of the polarity, the adhesion of the metal thin film layer to the base coat layer is enhanced.

Further, according to the invention described in claim 2 ,
In addition to the effect of the invention according to claim 1, the compounding amount of the silane coupling agent having a mercapto group in the base coat layer is 0.8% by weight or more and 2.0% by weight or less. It is played more reliably.

According to the third aspect of the present invention,
In addition to the effect of the invention described in claim 1 or claim 2 , the silane coupling agent having a mercapto group is γ-
Since it is mercaptopropyltrimethoxysilane, the bonding strength is further enhanced.

[0020]

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 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, and its film thickness is “about 25 μm”.
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 on the base coat layer 3, and the 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 base coat layer 3
Has a glass transition point of −10 ° C. and is relatively soft. And, in the base coat layer 3,
Silane coupling agent having a mercapto group (for example,
1.5% by weight of γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, etc.). As the silane coupling agent having a mercapto group, it is particularly preferable to use γ-mercaptopropyltrimethoxysilane.

The radiator grill 1 configured 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 and baked at a high temperature of 110 ° C. for 90 minutes. As a result of this baking, as shown in FIG.
The base coat layer 3 of “5 μm” is formed.

Subsequently, the substrate 2 on which the base coat layer 3 is formed is set in a known sputtering apparatus, and the initial vacuum degree is "6.0 × 10 ^-3 Pa" and the film forming vacuum degree (Ar gas pressure) is " 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, a metal thin film layer 4 having the above-described crystal grain boundaries 6 (crystal average size: 100 ° or less) is formed.

Thereafter, a paint for the top coat layer 5 is applied and baked at a high temperature of 70 ° C. for 70 minutes. By this baking, as shown in FIGS. 1 and 2, a top coat layer 5 having a thickness of “about 25 μm” is formed on the metal thin film layer 4. 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 force from the outside, as shown in FIG. 5, the base material 2, the base coat layer 3, and the top coat layer 5 made of a soft resin follow the external force. Can be deformed. In addition, since the metal thin film layer 4 itself has the crystal grain boundary 6, even if it receives a stress caused by such external force, the metal thin film layer 4 only spreads between adjacent crystal grains. Stress hardly acts on the metal itself constituting 4. 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 the peripheral surface of the 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. did. 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, the metal thin film layer 4 is uniformly formed by the aggregation of the fine metal particles. It can be visually recognized as a metal film having a surface. 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, with the configuration of the present embodiment, the appearance quality is not inferior to that of the conventional technique (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 or 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 this embodiment, particularly, the glass transition point of the base coat layer 3 is relatively soft at -10 ° C., and the crystal grains (metal grains) constituting the metal thin film layer 4 are formed of the base coat layer 3. Relatively easily pierce and bite. Therefore, the bonding force of the metal thin film layer 4 to the base coat layer 3 becomes relatively high. Further, the glass transition point is not too low and the strength is not too weak. Therefore, cracks are unlikely to occur in the base coat layer 3.

Further, the base coat layer 3 contains a silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane). For this reason, the bonding force between the base coat layer 3 and the metal thin film layer 4 is further increased. From these, it can be said that delamination between the base coat layer 3 and the metal thin film layer 4 can be suppressed without deteriorating the appearance quality.

Here, the following experiment was conducted in order to confirm the effects of the above (d). That is, first, a base coat layer having various glass transition points T _g was prepared, and the base coat layer was subjected to sputtering to form a metal thin film layer. At this time, the adhesiveness of the metal thin film layer (easiness of piercing of crystal grains) and appearance quality (whether or not cracks occurred after performing a simple bending test) were evaluated. Table 1 shows the results. In the table, the adhesion was evaluated by a peeling test (JIS D0202 4.15). A circle indicates that none of the 100 places was peeled off, and a triangle indicates that the peeling was less than 5 places. What happened
× indicates that peeling occurred at 5 or more locations. In the table, in the column of appearance quality, ○ indicates that no cracks occurred, and x indicates that cracks occurred to some extent.

[0033]

[Table 1] As shown in Table 1, when the glass transition point T _g is 0 ° C. or lower, the base coat layer is soft, and a high bonding force between the base coat layer and the metal thin film layer can be obtained. On the other hand, when the glass transition point T _g is 10 ° C. or more, it is understood that peeling between the base coat layer and the metal thin film layer easily occurs.

However, when the glass transition point T _g is too low (when the temperature is −40 ° C. or lower), the strength of the base coat layer becomes too low, and cracks easily occur. From these facts, the glass transition point T
_{If g} is in the range of −30 ° C. or more and 0 ° C. or less, it can be said that relatively high bonding strength between the base coat layer and the metal thin film layer can be obtained.

Second, the effectiveness of blending a predetermined amount of a silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) into the base coat layer 3 was confirmed. That is, a base coat layer comprising 1.5% by weight of a silane coupling agent having various functional groups was prepared, and the base coat layer was sputtered to form a metal thin film layer. At this time, the adhesion of the metal thin film layer was evaluated by the Goban peel test in the same manner as described above. Table 2 shows the results. Also,
The adhesion in the case where the film was formed by changing the blending 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.

[0036]

[Table 2]

[0037]

[Table 3] 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 base coat layer and the metal thin film 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.

Further, as shown in Table 3 above, when the compounding ratio of the silane coupling agent having a mercapto group (γ-mercaptopropyltrimethoxysilane) is 0.8% by weight or more and 2.0% by weight or less. Although a high bonding strength was obtained between the base coat layer and the metal thin film layer, a decrease in the bonding strength was observed in other ranges.

(E) In addition to the effects (d), in the present embodiment, the metal thin film layer 4 is manufactured by sputtering. For this reason, the kinetic energy of the crystal grains piercing the base coat layer 3 becomes relatively large, and the adhesion to the base coat layer 3 can be further improved. In addition, since the crystal size is relatively fine, the degree of freedom of deformation increases,
The effect of suppressing the occurrence of cracks can be further improved.

(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, this embodiment is different 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 are spread over the metal grains, and a boundary between the metal grains is a so-called crystal grain boundary 12.

The radiator grill 13 configured as described above is manufactured, for example, as follows. That is, first, the base material 2 is formed in the same manner as described above, and then the base material 2 is formed.
The base coat layer 3 is formed on the surface. 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 and baked at a high temperature of 110 ° C. for 90 minutes. Thereby, the base coat layer 3 having a thickness of “about 15 μm” is formed.

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 and baked at a high temperature of 70 ° C. for 70 minutes. By this baking, a top coat layer 5 having a thickness of “about 20 μm” is formed on the metal thin film layer 11. Then, after the completion of the printing, the radiator grill 13 described above is obtained by being left at room temperature for one day.

The radiator grill 13 thus configured also basically has the same operation and effect as the first embodiment (the sheet resistance of the metal thin film layer 11 is 250 kΩ / □). Before and after). (Third Embodiment) Next, a third 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 FIG. 8, in the present embodiment, the paint component forming the base coat layer 21 is different from the paint component forming the base coat layer 3 in the first embodiment. More specifically, in the radiator grill 22 of the present embodiment, a hydroxyl group (OH) in one molecule is used as a main component of the paint for forming the base coat layer 21 instead of the acrylic urethane paint for forming the base coat layer 3. Polyester polyol having at least 3 and no more than 10 groups). Here, if the number of hydroxyl groups is less than 3, the adhesion of the metal thin film layer 4 to the base coat layer 21 may be reduced. If the number of hydroxyl groups exceeds 10, the smoothness of the metal thin film layer may be reduced. May deteriorate. In addition, the number of hydroxyl groups is more preferably 4 or more and 9 or less, and still more preferably 6 or more and 8 or less.

Further, as a paint component for forming the base coat layer 21, a hard paint component such as an alkyd resin or an acrylic resin, or a soft paint component such as polyester or polyether may be used. In addition, these hard paint components and soft paint components may be used alone or in combination. In short, base coat layer 2
The coating material forming 1 only needs to contain a coating component having 3 to 10 hydroxyl groups in one molecule. However, in the present embodiment, the coating material forming the base coat layer 21 contains an isocyanate having the same molecular number as the polyester polyol.

The paint for the base coat layer 21 in the present embodiment contains a polyester polyol having 3 to 10 hydroxyl groups in one molecule, an isocyanate and the like. In this case, the hydroxyl group of the polyester polyol reacts with the isocyanate, and a polyurethane or the like having a urethane bond is obtained in the paint. Here, since the polyester polyol and the isocyanate have the same molecular number in the coating, even if two hydroxyl groups in one molecule of the polyester polyol are introduced into the urethane bond, at least one polyester group per molecule is present in the coating. At least 8 hydroxyl groups remain. For this reason, the polarity is generated in the paint by the hydroxyl groups remaining in the paint, and as a result, the polarity is also generated in the base coat layer 21. When the metal thin film layer 4 is formed on the surface of the base coat layer 21 by a sputtering device, the metal thin film layer 4 easily adheres to the surface of the base coat layer 21 due to the influence of the polarity.
The adhesion of the metal thin film layer 4 to the metal thin film layer 4 is improved.

Therefore, the radiator grill 22 according to the present embodiment also basically has the same operation and effect as the first embodiment. Here, the following experiment was performed in order to confirm the above-mentioned effects. That is, as a paint for forming a base coat layer, hydroxyl groups are contained in one molecule in 2,3,
4, 6, 8, 9, 10, and 12 polyester polyols, and isocyanate having the same molecular number as the polyester polyol were prepared. Then, a base coat layer was formed from the coating material, and the base coat layer was subjected to sputtering to form a metal thin film layer. At this time, the adhesion (easiness of piercing of crystal grains) and smoothness of the metal thin film layer to the base coat layer were evaluated. Table 4 shows the results. In the table, the adhesion was evaluated by a goban peel test, and ○ indicates 1 out of 100 places.
The symbol “△” indicates that the portion did not peel, the symbol “△” indicates that there was peeling in less than 5 portions, and the symbol “×” indicates that the peeling occurred in more than 5 portions. In the table, ○ in the column of smoothness indicates that there was no problem at all, Δ indicates that there was no problem, although there was some problem, and X indicates that there was a problem in use, respectively. I have.

[0050]

[Table 4] As shown in Table 4 above, when the number of hydroxyl groups is 3 or more in one molecule, it can be understood that a high bonding strength between the base coat layer and the metal thin film layer can be obtained. On the other hand, when the number of hydroxyl groups is less than 3 in one molecule, it can be seen that peeling between the base coat layer and the metal thin film layer easily occurs. This is presumably because the hydroxyl group of the polyester polyol was introduced into the urethane bond and no hydroxyl group remained in the coating, and no polarity was generated in the coating and the base coat layer.

On the other hand, when the number of hydroxyl groups is 2 or more and 9
It can be seen that there was no problem with the smoothness of the metal thin film layer when the number was less than the number. In addition, when the number of hydroxyl groups is 10 per molecule, it can be seen that there was no problem in use, although there was a slight problem in smoothness. In contrast, when the number of hydroxyl groups is 12 in one molecule,
It turns out that the smoothness of the metal thin film layer deteriorated and there was a problem in use. This is presumably because as the number of surplus hydroxyl groups in the coating material increases, the effect of the hydroxyl groups on the surface of the base coat layer increases, and eventually the smoothness of the metal thin film layer. From these facts, it can be said that if the number of hydroxyl groups is in the range of 3 or more and 10 or less in one molecule, relatively high bonding strength and smoothness between the base coat layer and the metal thin film layer can be obtained.

Further, in order to confirm the effect of suppressing delamination between the base coat layer 21 and the metal thin film layer 4, the following experiment was conducted. That is, a test piece was prepared which was substantially the same as the one described above in which the adhesion (easiness of piercing of crystal grains) and smoothness of the metal thin film layer to the base coat layer were evaluated.
Then, the test piece was subjected to a weather resistance test using a super UV tester. Thereafter, the adhesiveness of the metal thin film layer to the base coat layer was evaluated by a Goban peel test. Table 5 shows the results.

In the table, x / 16 indicates how many of the 16 eyes were peeled off by five peeling operations, and は indicates that none of the 16 places was peeled off. △
Indicates that peeling occurred in less than 5 places, and x indicates that peeling occurred in 5 or more places.

In Test No. 1, the number of hydroxyl groups in the polyester polyol was two in one molecule, and in Test No. 2, the number of hydroxyl groups in the polyester polyol was three in one molecule. In Test No. 3, the number of hydroxyl groups in the polyester polyol was 4, 6,
8, 9 and 10. The number of hydroxyl groups is 1
4, 6, 8, 9 and 10 in the molecule did not produce any difference as a result, so they were put together and shown as Test No. 3.

[0055]

[Table 5] As shown in Table 5 above, when the number of hydroxyl groups was 2 per molecule (Test No. 1), peeling occurred in 20 super UV treatment cycles. When the number of hydroxyl groups was 3 per molecule (Test No. 2), peeling occurred in 25 super UV treatment cycles,
The bonding strength between the base coat layer and the metal thin film layer was tested N
o. It is better than one. On the other hand, when the number of hydroxyl groups was 4, 6, 8, 9 and 10 in one molecule (Test No. 3), no peeling occurred even with 40 super UV treatment cycles. From the above, if the number of hydroxyl groups in the range of 3 or more and 10 or less in one molecule,
It can be said that a relatively high bonding force between the base coat layer and the metal thin film layer can be obtained.

The above embodiments are not limited to those described above, but may be modified as follows. (1) In each of the above embodiments, the metal thin film layers 4 and 11 are embodied as being made of chromium. However, other metal materials having corrosion resistance, such as nickel, titanium, tantalum, aluminum or The metal thin film layer may be formed of various metal materials such as alloys thereof.

(2) In each of the above embodiments, the sputtering method or the vacuum evaporation method is used to form 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.

(3) In each of the above embodiments, the soft luminous product is embodied in the radiator grills 1, 13, and 22 for automobiles, but other products, such as emblems for automobiles, side moldings, etc. And various interior products.

(4) 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 separately colored. The technical ideas that are not described in each claim of the claims but can be grasped from each of the above embodiments are described below together with their effects.

(A) In the soft glittering product, the base coat layer has a glass transition temperature of -10 ° C. and contains 1.5% by weight of the silane coupling agent having a mercapto group. It is characterized by the following.

With this configuration, it is possible to more reliably suppress delamination between the base coat layer and the metal thin film layer.

[0062]

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, the present invention has an excellent effect that cracks can be more reliably suppressed from occurring, deterioration in appearance quality can be prevented, and delamination between the base coat layer and the metal thin film layer can be suppressed.

[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 an enlarged sectional view schematically showing a radiator grill of a third embodiment.

FIG. 9 is a cross-sectional view schematically showing the structure of a conventional softening product.

FIG. 10 is a cross-sectional view for explaining a problem of a conventional softening product.

[Explanation of symbols]

1, 13, 22: radiator grill as a softening product, 2: base material, 3, 21: base coat layer, 4, 11
... metal thin film layer, 5 ... top coat layer, 6, 12 ... crystal grain boundary.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasutaka Hasegawa 1 Ochiai Nagahata, Kasuga-machi, Nishikasugai-gun, Aichi Prefecture Toyota Gosei Co., Ltd. Inside (72) Inventor Yasuhiko Ogisu 1 Ochiai Nagahata, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture (56) References JP-A-9-70920 (JP, A) JP-A-2-286328 (JP, A) JP-A-9-74273 (JP, A) JP-A-57-12637 ( JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 15/08

Claims (3)

(57) [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. in formula product, the base coat layer, with its glass transition point is below 0 ° C. -30 ° C. or higher, der is, and the base as a silane coupling agent having a mercapto group is blended
The paint that forms the squat layer has three hydroxyl groups in one molecule.
A soft glittering product characterized by containing a paint component having at least 10 components . 2. The method according to claim 1 , wherein the silane cap in the base coat layer is provided.
0.8% by weight or more and 2.0% by weight or less
Soft bright reduction product according to claim 1, characterized in that the bottom. 3. A silane cup having a mercapto group.
The ring agent is γ-mercaptopropyltrimethoxysila
Soft bright reduction product according to claim 1 or claim 2, characterized in that it is down.