JP2006015680A - Lusterless film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lusterless film which has a cross sectional structure not only irregularly reflecting incident light but also keeping the effect and can exhibit design of a high quality by making the lusterless state while keeping a metallic gloss. <P>SOLUTION: In the lusterless film made by laminating at least a resin layer of a resin on a surface of a base film of a polymer resin, the resin is made to contain a filling material in advance, and the average diameter y of the filling material and the thickness x of the resin layer satisfy the equation of y=ax (wherein 1.0<a≤1.5). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a matte film, and specifically relates to a matte film used to produce a high-class design feeling by sticking to the surface of a decorative board used in, for example, a refrigerator or a system kitchen.

  In recent years, it has been practiced to devise the appearance of water-based products such as refrigerators, so-called white goods, and system kitchens, to give the product a profound feeling and luxury. In particular, giving the appearance of a so-called matte surface of the product is performed especially for producing a high-class feeling as having excellent design properties.

  In view of this, conventionally, a process for exhibiting such an appearance is performed on the surface of a plate material such as a metal plate or a resin plate which is an outer plate of a product. For example, the matte process is performed by engraving innumerable fine lines called hairlines directly on the surface.

  However, when a hairline is cut directly on the surface of the plate material, it takes time and effort, and it is not necessarily a suitable method. In addition, if such matte treatment is applied to the surface of the plate material, the hairline is cut directly into the plate material surface. However, engraving the hairline means that the plate material surface is scratched. Since the plate material is likely to deteriorate as a cause, it cannot be said that it is a preferable and perfect method.

  In view of this, a method for obtaining a similar effect by preparing a matte film that has been subjected to a matte treatment in advance and sticking it to the surface of a metal plate or a resin plate is actually being carried out.

  To further explain this, first, a resin or metal is laminated on the surface of a polymer resin film such as a polyethylene terephthalate (PET) film, and then the matte surface is subjected to a matte treatment to give a gloss. By making it a matte film and sticking it on the surface of a metal plate, a resin plate or the like, a plate material whose surface is matted is obtained. And the obtained board | plate material is used as decorative boards, such as a refrigerator, for example.

  As a matte film used for such a purpose, for example, in the invention described in Patent Document 1, at least one surface of a base film having a roughened surface has a metal vapor-deposited layer, and the other surface has printability. A matte film having a metallic luster having a configuration having an easy-adhesion layer mainly composed of an oxazoline group-modified resin for making it suitable is disclosed. In this way, the incident light that is uniformly incident on the smooth surface is reflected uniformly, but the surface becomes a random surface by engraving innumerable fine irregularities and streaks on the smooth surface. The incident light that is uniformly incident on the surface is irregularly reflected, so that it looks like the matte appearance while maintaining the metallic luster.

JP 2001-328207 A

  However, since the matte film described in Patent Document 1 is required to be roughened by scratching at least one side of the base film by some method, it is provided from the beginning of the base film. There is a very high possibility that the physical characteristics and the like that have been lost will be damaged. In other words, if a myriad of scratches are made, the base film will be scratched, and when the metal vapor deposition layer is vapor deposited due to the scratch or when this is used for a plate, the base film can be easily removed. Since it can be broken, it cannot be said to be a sufficiently effective technique. In addition, various methods for roughening have been proposed, but in any case, since the substrate film is directly processed and processed by some method, the properties of the substrate film deteriorate. It is inevitable to do.

  Therefore, instead of the base film, it is conceivable to laminate some kind of material, such as a metal vapor deposition layer, etc., and to make the surface of the laminate matted by some technique, but the conventionally proposed method If this is the case, the surface of the laminate will still be scratched directly by some method, so the damage to the laminate will be accelerated, deteriorated from the scratched part, and the part that has been scratched during long-term use. However, the problem that the effect is lost due to wear becomes smooth. In addition, as described above, when a conventional matte film is used for so-called white goods such as a refrigerator, a detergent, vinegar, or an alkaline material is applied to the surface of the conventional matte film. Since the portion was easily whitened, it was desired as a market demand to realize a matte film that does not whiten even in such a case.

  The present invention has been made in view of such problems, and its purpose is not only to diffusely reflect incident light by a very easy method, but also to achieve its effect despite its simple configuration. The present invention provides a matte film having a lasting cross-sectional configuration and capable of presenting a high-class design feeling by being in a matte state while maintaining a metallic luster.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is a film obtained by laminating a resin layer of at least a resin on the surface of a base film made of a polymer resin. Further, a matte film in which a filler is previously contained in a resin, wherein the relationship between the average particle diameter y of the filler and the thickness x of the resin layer is y = ax (where 1.0 < a ≦ 1.5)).

  The invention described in claim 2 of the present invention is characterized in that in the matte film described in claim 1, either or both of an inorganic filler and an organic filler are used as the filler.

The film according to claim 3 of the present invention is the matte film according to claim 2,
The inorganic filler or organic filler is insoluble in the resin and the solvent used at the time of inclusion.

  The film according to claim 4 of the present invention is the matte film according to claims 2 to 3, wherein the inorganic filler is a silica filler or a titanium oxide filler, and the organic filler is a styrene filler, It is an acrylic filler or a melamine filler.

  The film according to claim 5 of the present invention is the matte film according to any one of claims 1 to 4, wherein the substrate film is any one of a polyethylene terephthalate film, a polypropylene film, and a polyurethane film. Or it is characterized by being plural.

  As described above, in the matte film according to the present invention, in the film formed by laminating at least the resin layer made of the resin on the surface of the base film made of the polymer resin, the filler is preliminarily laminated when the resin is laminated. Therefore, the filler will diffusely reflect the incident light, so that the film surface appears to have been matted. If it sticks on the surface, it can be set as the decorative board in which the matte process was made. Further, the relationship between the average particle diameter y of the filler and the thickness x of the resin layer is represented by y = ax (where 1.0 <a ≦ 1.5), so that the cross-sectional view In this case, a part of the filler always protrudes in a convex shape from the resin layer, and when 1.0 <a ≦ 1.5, the fillers do not approach each other more than necessary, that is, in other words Since the fillers are present at a certain interval, for example, even if the matte film according to the present invention is subjected to a cleaning alkaline detergent or the like, the portion turns white and the design is impaired. It will disappear.

  Embodiments of the present invention will be described below. The embodiment shown here is merely an example, and is not necessarily limited to this embodiment.

(Embodiment 1)
A matte film according to the present invention will be described as a first embodiment.
The matte film according to the present embodiment is a film in which a resin layer made of at least a resin is laminated on the surface of a base film made of a polymer resin, in order to improve alkali resistance when laminating the resin. Although it has a configuration in which a filler is previously contained in the resin, the relationship between the average particle size y of the filler and the thickness x of the resin layer is y = ax (where 1.0 <a ≦ 1.5).

  First, a film used as a polymer resin film as a base material may be a known film. For example, a polyethylene terephthalate film, a polypropylene film, a polyurethane film, and the like can be considered. In the present embodiment, a polyethylene terephthalate film is used. Shall be used. Furthermore, the thickness of the film is not particularly specified, but it is preferably 6 μm or more and 300 μm or less, more preferably 10 μm or more and 100 μm or less.

  This is because if it is less than 6 μm, it is too thin as a substrate film, so that it is impossible to laminate a laminate described later, and if it exceeds 300 μm, the total thickness of the film obtained becomes too thick, which will be described later. This is because it cannot be used for decorative purposes. In this embodiment, a polyethylene terephthalate film having a thickness of 25 μm is used.

  Subsequently, a resin layer is formed by laminating a resin on the surface of the polymer resin film to be a base material. In this case, a filler is previously contained in the resin. There may be various purposes for containing the filler, but in this embodiment, it should be included in order to improve the alkali resistance, and it will be explained according to this purpose, but it should be included for other purposes. , As well.

This filler and resin will be described.
The filler according to the present embodiment may be a known one, but for example, using one or a plurality of inorganic fillers and organic fillers, more specifically, silica filler, titanium oxide filler, styrene filler, There are acrylic filler, melamine filler, and the like. In the present embodiment, silica filler is preferably used from the viewpoint of ease of handling, availability, and the like. In addition, even if it is a substance other than this, as long as it can improve alkali resistance, it does not matter, but the inorganic filler and organic filler used in the present embodiment contain these. It is important that it is insoluble in the resin used and the solvent used when it is contained. Further, as described above, if it is contained in order to improve alkali resistance, it may be a filler according to that, and if it is contained for other purposes, it also contains a filler according to that purpose. What should I do?

  The resin containing the filler is not particularly specified here, but is assumed to be a resin such as an acrylate resin, a urethane resin, or an epoxy resin. For example, an acrylate resin may be used to impart hard coat properties. In addition, although it is the method of making a resin contain a filler, this may be sufficient if both are mixed by a conventionally well-known method, and it does not have a special method.

  The resin containing the filler may be laminated on the surface of the base film by a known method such as a slit reverse method or a gravure method, and is assumed to be a slit reverse method in this embodiment.

  And although the silica as a filler in this Embodiment is a substantially spherical thing, when this is contained in resin as mentioned above, a filler containing resin is apply | coated and a resin layer is laminated | stacked, as shown in FIG. A schematic cross section is shown. In FIG. 1, 1 is a base film, 2 is resin, 3 shows a filler.

  At this time, as described above, the relationship between the average particle diameter y of the filler and the thickness x of the resin layer satisfies y = ax (where 1.0 <a ≦ 1.5). This is important in this embodiment.

  This point will be further described. By satisfying the above relational expression, a part of the filler always protrudes from the outermost surface of the resin layer. And since the front-end | tip of many fillers protrudes on the surface of a resin layer, when the whole resin layer surface is observed, the surface is not a smooth thing but is in the state in which the convex part was formed at random. Considering that light enters the surface of the resin layer and reflects it in this state, completely different irregular reflection occurs in each part of the surface of the resin layer. That is, when the surface of the resin layer is smooth, gloss is generated because the reflected light is uniformly reflected when reflected, but when this is irregularly reflected, the reflected light is offset and the gloss is not so much. It becomes a so-called matte state. Therefore, since the front end portion of the filler must protrude from the resin layer surface, a in the above formula must be greater than 1.0.

  Next, when the value of a in the above formula is larger than 1.0, as described above, a part of the filler protrudes from the outermost surface of the resin layer, but it is always always preferable to increase it indefinitely. Not exclusively. In other words, if the value of a becomes too large, it no longer makes sense as a filler. Therefore, if the value of a is too large, it can be said that it is out of the question. However, if the value of a is larger than a certain value, the filler is densely packed in the resin layer, resulting in a phenomenon that the interval between the fillers is shortened. Therefore, it can be said that there is a suitable value for the upper limit of the value of a.

  To explain this in more detail, if a filler that establishes a relationship that the value of a becomes too large to some extent is used, the diameter of the filler is made large even though the volume of the resin layer is constant. As a result, the ratio of the filler to be applied to the resin layer increases, that is, the density of the filler in the resin layer becomes high, and as a result, the interval between the fillers becomes short.

  If the spacing between the fillers is short, it seems that the outermost surface of the resin layer is finer and more messy, so it seems that the matte effect due to irregular reflection is more likely to occur. There is a situation where they are very close and in some cases contact. In such a state, the function as the filler can no longer be achieved, and the essential effect of the resin layer will be lost. When an alkaline solution such as an alkaline household detergent is applied to the resin layer from the outside, a phenomenon occurs in which the alkaline solution erodes the resin layer. When the alkaline solution erodes the resin layer and does not affect the filler at the same time, the outermost surface of the resin layer is deeply eroded. When the part eroded in such a state is exposed to external light, the part changes the state of diffuse reflection of light, and at first glance, only that part appears to be clouded, and presents a sense of luxury design. The phenomenon that the matte part that had been lost disappears occurs. In other words, when the spacing between the fillers is wide, the depth of erosion in the cross-sectional view is not so great, but when the spacing between the fillers is narrow, the depth of erosion in the cross-sectional view becomes deep enough to cause the above-described effect. End up.

  Therefore, in order to reduce the possibility of occurrence of such a white turbidity phenomenon as much as possible, it is necessary to set the spacing between the fillers to a certain value or more. Therefore, in the present embodiment, the upper limit of the value of “a” is set to 1.5 in order to obtain the filler spacing that does not cause white turbidity due to erosion by the alkaline solution.

  As described above, in the matte film according to the present embodiment, by laminating a resin layer containing a filler, a surface matting effect can be obtained by irregular reflection caused by the effect of the filler protruding from the resin layer, and In order to obtain a film in which the surface of the matte film does not become cloudy because the space between the fillers is ensured to some extent, that is, there is more than a certain distance between the protrusions of the filler protruding from the resin layer surface. is there.

  The embodiment described above will be further described by the following examples.

Example 1
First, a resin containing a filler was laminated on one side of a PET film with a thickness of 25 μm (Mitsubishi Chemical Polyester Film Co., Ltd .: trade name “Mitsubishi Diafoil”) Silica filler as a filler (manufactured by GE Toshiba Silicone Co., Ltd .: (Trade name “Tospearl”), urethane acrylate was used as the resin. The lamination method was a slit reverse method.
As a result, the thickness x of the resin layer was 3.0. The particle size y of the filler contained in the resin was 4.5. Therefore, the relationship y = 1.5x is established.

  In this case, the matte feeling was very good. Further, even when an alkaline solution (sodium hydroxide aqueous solution) was applied to this, the portion where the alkaline solution was applied did not become cloudy.

(Example 2)
The filler used in Example 1 was changed to one having a particle size y of 4.0. Everything else is the same as in the first embodiment. Therefore, the relationship y = 1.3x is established.
The matte feeling in this case was good. Further, even when an alkaline solution was applied to this, the portion to which the alkaline solution was applied did not become cloudy.

(Comparative Example 1)
The filler used in Example 1 was changed to a particle size y of 5.5. Everything else is the same as in the first embodiment. Therefore, the relationship y = 1.8x is established.
In this case, the matte feeling was not particularly impossible. However, when an alkaline solution was applied to this, the portion to which the alkaline solution was applied became intensely clouded.

It is a schematic sectional drawing of the matte film concerning this invention.

Explanation of symbols

1 Base film 2 Resin 3 Filler

Claims (5)

In a film formed by laminating at least a resin layer with a resin on the surface of a base film made of a polymer resin,
When laminating the resin, it is a matte film containing a filler in advance in the resin,
The relationship between the average particle size y of the filler and the thickness x of the resin layer is represented by y = ax (where 1.0 <a ≦ 1.5),
A matte film characterized by The matte film according to claim 1,
Using either or both of an inorganic filler and an organic filler as the filler,
A matte film characterized by The matte film according to claim 2,
The inorganic filler or organic filler is insoluble in the resin and the solvent used at the time of containing,
A matte film characterized by The matte film according to any one of claims 2 to 3,
The inorganic filler is a silica filler or a titanium oxide filler,
The organic filler is a styrene filler, an acrylic filler or a melamine filler;
A matte film characterized by The matte film according to any one of claims 1 to 4,
The base film is a polyethylene terephthalate film, a polypropylene film or a polyurethane film, or a plurality thereof,
A matte film characterized by

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