JP2011246718A - Scaly thin film fine powder dispersed solution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scaly thin film fine powder dispersed solution capable of giving a metallic pigment with the scaly thin film fine powder dispersed solution in an ink forming luxuriant metallic luster to printed matter while preventing nozzle clogging by a treatment to the scaly thin film fine powder dispersed solution so as to prevent easy precipitation of the scaly thin film fine powder.SOLUTION: The scaly thin film fine powder dispersed solution is constituted by containing the scaly thin film fine powder constituted by finely pulverizing a metallic single body, an alloy or a metallic compound in slovent, wherein the scaly thin film fine powder has an average major axis of 0.5-5.0 μm, maximum major axis of 10 μm or less, average thickness of 5-100 nm and an aspect ratio of 20 or more.

Description

  The present invention relates to a scaly thin film fine powder dispersion, specifically, for example, as a raw material of a metallic pigment ink for an ink jet printer that can realize a printed matter exhibiting metallic luster with an ink jet printer. The present invention relates to a dispersion liquid containing a fine powder in which a metal such as aluminum is in the form of a scale and in the form of a thin film.

  Conventionally, outdoor advertising has been widely used for the promotion of products and shops, and in particular, the method of developing advertising using printed materials is being widely implemented. As outdoor advertising using this printed matter, posters are most often pasted in various places, and it is still a universal technique found in towns. In recent years, with the improvement of printing technology, even paper with a huge size, such as a sign drawn by hand, has been printed on special paper and pasted as a sign and displayed outdoors. And that is also done.

  Production of such printed matter, that is, posters, outdoor advertisements, signboards, sign displays, POP advertisements (Point of purchase advertising), etc., is made by companies that produce signboards and sign displays in addition to various printing companies. In recent years, photo labs and commercial printing companies, etc. have been digitizing the above-mentioned printed material creation in response to changes in the situation such as smaller lots, shorter delivery times, diversified and complicated graphical designs. At the same time, the market is rapidly expanding.

  With such changes in the situation, it has been strongly required to differentiate printed materials. For example, the content expressed by printing is more precise and can be expressed as smoothly as possible up to the details. In the case of photographic printing, the same precision as that of conventional photographic printing by silver salt photography is reproduced in details. There has been a demand for printing capable of such expression. In order to meet the various demands described above, a business inkjet printer (hereinafter also simply referred to as “inkjet printer”) has been increasingly used.

  At the same time as the demand for high-definition printing, there is an increasing demand for high-quality printing. As a prime example, the use of metallic luster has been demanded.

  As a metallic luster in this printed matter, conventionally, a transfer foil called a so-called gold foil or silver foil has been widely used. For this reason, it has become necessary to use an ink having metallic luster, that is, an ink using a metallic pigment (hereinafter, also simply referred to as “metallic pigment ink”) for printing. In particular, there is an increasing demand for using metallic pigment inks in inkjet printers that enable high-definition printing.

  In order to obtain a print having a metallic luster such as a gold foil or a silver foil, it is easiest to use a metallic pigment ink using fine pieces of gold or silver, and the effect obtained is also great. It will be a thing.

  As such a metallic pigment ink, for example, in Patent Document 1 and Patent Document 2, ink for an ink jet printer assumed to be used in an ink jet printer, more specifically, aluminum or gold having a thickness of 0.2 μm or less. Ink containing flat pieces such as silver has been proposed.

JP-A-11-323223 Japanese Patent Laid-Open No. 11-343436

  However, in the case of the ink jet ink described in Patent Document 1, after all, it is merely that a non-standard flat piece made of metal (hereinafter simply referred to as “flat piece”) is simply mixed in the ink. However, even if this is used for a commercial inkjet printer, high gloss cannot be obtained due to the shape of the flat piece. In addition, since the flat piece constituting the ink jet ink described in Patent Document 2 has a structure in which a resin layer is further laminated on the flat piece constituting the ink jet ink described in Patent Document 1, Even after printing, high gloss cannot be obtained due to the thickness of the flat piece.

This point will be described.
First, even if the flat piece is simply mixed with the ink to make the metallic pigment ink, the flat piece will settle down below the ink tank unless much measures are taken. If the metallic pigment ink with the flat pieces settled is used in the ink jet printer, the flat ink is not mixed from the ink tank. In other words, only the ink in the supernatant state is also called an ink nozzle of the ink jet printer (hereinafter also simply referred to as “nozzle”). .) Is ejected from the portion, and even if it is a printing portion where a metallic luster is desired, there is no metallic luster, and there is no meaning and simple ordinary printing using the metallic pigment ink. If it continues to be used as it is, the portion of the metallic pigment ink in which the flat pieces have settled will eventually be used, but this time the metallic pigment ink containing a large amount of flat pieces is concentrated on the nozzle portion and introduced. In this case, the flat piece easily blocks the nozzle portion, and eventually a printing trouble occurs and printing cannot be performed.

  The reason why such a phenomenon occurs is as follows. Even if the actual size of each flat piece does not block the nozzle, the flat pieces may actually aggregate together for various reasons. Because it is easy to become. Therefore, it is a metallic pigment ink that cannot be put to practical use simply by including a flat piece in the ink. If it is a metallic pigment ink that can actually be used, it will actually be effective if it is not a metallic pigment ink that clarifies that the flat piece has been subjected to some kind of treatment. It will be something that will not be done.

  In other words, it is difficult to make it work as an ink for an ink jet printer by simply containing a flat piece. Even if the flat piece is made finer and contained in a metallic pigment ink, it is flat in the ink tank during actual use. If the pieces settle or agglomerate, they cannot be used as metallic pigment ink after all.

  Therefore, in order to prevent such a phenomenon, it is conceivable that the metallic pigment ink containing the flat piece is sufficiently stirred before actual use so that the flat piece is universally present in the metallic pigment ink. Therefore, it is necessary to devise some kind of device to the device, and it is expected that there will be a problem that the device that can use the metallic pigment ink is restricted.

  Even if the flat piece can be ejected from the nozzle of the ink jet printer by some method, it is difficult to obtain a beautiful metallic luster with the ink described in Patent Document 1. This is because it is envisaged that the flat pieces contained in such an ink have a shape that can be said to be almost grain-shaped, that is, light is irradiated to the flat particles arranged substantially flat. However, such light rays are irregularly reflected, and as a result, it is considered that a desired metallic luster cannot be obtained.

  In other words, if the flat piece is substantially grainy, the printed surface obtained by applying the flat piece to a flat surface is in a state of having innumerable irregularities when finely observed. In order to obtain glossiness using flat pieces, it is preferable that the flat pieces have a flat shape with a high aspect ratio as much as possible. . The aspect ratio referred to here is a value obtained from the average major axis / average thickness of the flat piece. The average major axis of the flat piece is the average value of the entire flat piece having the longest length from end to end in the plan view of one flat piece, and the average thickness is one flat piece. It is assumed that the average value of the thickness in the side view of the piece is shown, and this is the same hereinafter. It can be said that the higher the aspect ratio, the flatter the shape.

  And if it is the atypical flat piece described in patent document 1 and patent document 2, the metallic glossiness in the printing surface which apply | coated this to a plane will reduce unevenness compared with the case of substantially granular shape, and will increase metallic glossiness. If the aspect ratio does not reach 20, that is, the degree of flatness is insufficient, and actually printing a metallic pigment ink using such However, sufficient metal luster cannot be obtained.

  And the atypical flat pieces described in Patent Document 1 and Patent Document 2 do not know whether or not the aspect ratio actually reaches 20, and even if it reaches, fine irregularities on the surface due to the reasons described above Therefore, in any case, even if printing is performed using these, a metallic gloss is not obtained so much, which is a problem.

  The present invention has been made in view of such problems, and the purpose of the present invention is to give the scaly thin film fine powder a treatment in which the scaly thin film fine powder does not easily settle in the metallic pigment ink. When used as a metallic pigment, the scaly thin film fine powder is dispersed more uniformly in the ink than in the past, and as a result, the metallic pigment ink using this prevents the nozzle clogging, The printed matter thus obtained is to provide a scaly thin film fine powder dispersion that can be used for a metallic pigment ink, which makes it possible to obtain a rich metallic luster.

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is an inkjet in which a scaly thin film fine powder obtained by finely pulverizing a simple metal, an alloy, or a metal compound is contained in a solvent. A scaly thin film fine powder dispersion for use in a metallic pigment ink for a printer, wherein the scaly thin film fine powder is one of the lengths of the scaly thin film fine powder from one end to another in a substantially plan view. The average major axis, which is the average value of the entire scale-like thin film fine powder having the longest length, is 0.5 μm or more and 5.0 μm or less, and the maximum major axis which is the maximum length is 10 μm or less. , Ri one thickness at substantially a side view of the scale-like thin film fine powder, the flaky thin-film powder der average thickness 5nm or 100nm or less the average value of the total value of the scale-like thin film fine powder The average major axis and the flat The ratio of thickness, that is, the aspect ratio represented by average major axis / average thickness is 40 or more, and is obtained by printing a metallic pigment ink for inkjet printers using the scale-like thin film fine powder dispersion on a glossy vinyl chloride sheet. metallic luster of the printed surface to be is, JIS_Z_8741 result of measurement by the standard, 20 ° specular gloss of 200 or more, 60 ° specular gloss of 330 or more, and Do Rukoto, characterized.

The invention according to claim 2 of the present invention is formed by vapor-depositing or sputtering a release layer made of a resin, and a single metal, an alloy, or a metal compound on or on the surface of a polymer resin film that is a base film. A laminate manufacturing process for obtaining a laminate by laminating a thin film layer in this order, and a thin film layer peeling for obtaining a thin film by peeling the thin film layer from the laminate while using a solvent capable of dissolving the resin Through a step, a fine pulverizing step of finely pulverizing the thin film present in the solvent, and a concentration adjusting step of adjusting a solid content concentration in the solvent of the finely pulverized thin film after the fine pulverizing step. A scaly thin film fine powder dispersion for use in a metallic pigment ink for an ink jet printer, obtained in a substantially plan view of one scaly thin film fine powder of the scaly thin film fine powder. The average length of the average value of the entire scale-like thin film fine powder of the longest length from end to end is 0.5 μm or more and 5.0 μm or less, and has the maximum length The maximum major axis is 10 μm or less, and the average thickness of the scaly thin film fine powder as a whole is an average value of the thickness of the scaly thin film fine powder as a whole in a side view is 5 nm or more and 100 nm or less. In addition, the ratio of the average major axis to the average thickness of the scaly thin film fine powder, that is, the aspect ratio represented by the average major axis / average thickness is 40 or more, and the ink jet using the scaly thin film fine powder dispersion The metallic gloss of the printed surface obtained by printing the metallic pigment ink for printer on the glossy vinyl chloride sheet was measured according to JIS_Z_8741 standard. As a result, the 20 ° specular gloss was 200 or more and the 60 ° specular gloss. But 330 or more, and Do Rukoto, characterized.

  Invention of Claim 3 of this invention is a scale-like thin film fine powder dispersion liquid of Claim 1 or Claim 2, Comprising: The said metal simple substance, an alloy, or a metal compound is aluminum, silver, gold | metal | money, nickel Any one or more of a group of metals consisting of chrome, tin, zinc, indium, titanium, silicon, copper, or platinum, or an alloy using these groups of metals, or oxidation of these groups of metals or alloys thereof Or any one or more of oxides, nitrides, sulfides, and carbides.

  Invention of Claim 4 of this invention is scale-like thin film fine powder dispersion liquid of any one of Claim 1 thru | or 3, Comprising: The said solvent is an organic solvent, It is characterized by the above-mentioned. To do.

  Invention of Claim 5 of this invention is a scale-like thin film fine powder dispersion liquid of Claim 4, Comprising: The said organic solvent is either a glycol ether type | system | group, a lactone type | system | group, or these mixtures. It is characterized by this.

  Invention of Claim 6 of this invention is the flaky thin film fine powder dispersion liquid of any one of Claim 1 thru | or 5, Comprising: In the said flaky thin film fine powder dispersion liquid of the said resin Content is 5 weight% or less of the said scaly thin film fine powder dispersion liquid, It is characterized by the above-mentioned.

  Invention of Claim 7 of this invention is the scale-like thin film fine powder dispersion liquid of Claim 6, Comprising: The said resin is soluble in the said solvent, It is characterized by the above-mentioned.

  The invention according to claim 8 of the present invention is the scaly thin film fine powder dispersion according to claim 6 or 7, wherein the resin is cellulose acetate butyrate, polyvinyl alcohol, polyvinyl butyral, polyethylene glycol. , Polyacrylic acid, polyacrylamide, cellulose derivative, polyvinyl butyral, acrylic acid copolymer or modified nylon resin.

  As described above, in the case of the scaly thin film fine powder dispersion according to the present invention, the average major axis, the maximum major axis, the thickness, and the aspect ratio of the scaly thin film fine powder contained therein are within a predetermined range. Therefore, it is easier than before to allow the flaky thin film fine powder in the dispersion to be suitably dispersed and present without being settled in the solvent, and the shape of the flaky thin film fine powder is Therefore, when this is used as a material for a metallic pigment ink for an ink jet printer, the metallic gloss of the printed surface becomes higher than when a conventional metallic pigment ink is applied. In addition, the metallic pigment ink obtained by using the scaly thin film fine powder dispersion according to the present invention does not cause nozzle clogging due to the presence of the scaly thin film fine powder, and can be used for a conventional commercial inkjet printer. The range of printed expressions can be dramatically expanded.

  In addition, as a method for obtaining such a scaly thin film fine powder dispersion, the thin film layer is peeled from the laminate while using a solvent capable of dissolving the peel layer for the laminate having the structure of base film / release layer / thin film layer To obtain a dispersion in which the thin film layer peeled in the solvent is contained as a foil, and further adjust the ratio of the finely pulverized thin film fine powder after finely pulverizing the foil present in the solvent. Cheap. That is, it is preferable because the concentration of the scaly thin film fine powder can be easily adjusted, and the concentration suitable for the inkjet ink can be easily obtained. The scale-like thin film fine powder in the solvent can be easily dispersed in the solvent, and when this is used as a raw material for the metallic pigment ink, the scale-like thin film fine powder contained in the resulting metallic pigment ink is easily Since they do not settle or condense with each other, it is possible to easily perform beautiful metallic printing by using them in an ink jet printer.

  As a method for obtaining such a scaly thin film fine powder dispersion, for example, cellulose acetate butyrate is used as the release layer, and either a glycol ether or lactone system or a mixture is used as the solvent, so that the scaly thin film fine powder is agglomerated. It is possible to obtain a dispersion that is difficult to be dispersed, that is, easy to disperse. Further, if the dispersion liquid thus obtained is used as a raw material for the metallic pigment ink, even if the obtained metallic pigment ink is used in, for example, an ink jet printer, it exhibits a smoother and more uniform metallic luster than before. Printing can be easily performed.

  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 scaly thin film fine powder dispersion (hereinafter also simply referred to as “dispersion”) according to the present invention will be described as a first embodiment.

  The dispersion according to the present embodiment is a liquid in which a thin film finely pulverized in a solvent exists as a thin film fine powder, if necessary. Moreover, such thin film fine powder is scale-like by finely pulverizing the thin film. And it can be said that there is also a feature in that the scaly thin film fine powder is treated so as not to easily settle or aggregate in a solvent. It should be noted in advance that the dispersion according to the present embodiment is also characterized in that it is assumed to be used for a metallic pigment ink for an ink jet printer.

First, the dispersion according to this embodiment will be described.
The dispersion according to the present embodiment is a scaly shape for use in a metallic pigment ink for an ink jet printer, in which a scaly thin film fine powder obtained by finely pulverizing a metal, an alloy, or a metal compound is contained in a solvent. A thin-film fine-powder dispersion, which is the entire scale-like thin-film fine powder having the longest length among the lengths from one end to the other in a plan view of one flaky thin-film fine powder. The average major axis, which is the average value, is 0.5 μm or more and 5.0 μm or less, the maximum major axis, which is the maximum length, is 10 μm or less, and the thickness of one scaly thin film fine powder in a schematic side view The average thickness, which is the average value of the entire scale-like thin film fine powder, is 5 nm to 100 nm, and the ratio of the average major axis to the average thickness of the scale-like thin film fine powder, that is, the aspect represented by the average major axis / average thickness. The ratio is 40 or more The metallic gloss of the printed surface obtained by printing the metallic pigment ink for inkjet printer using the scale-like thin film fine powder dispersion on the glossy vinyl chloride sheet was measured according to JIS_Z_8741 standard. Is 200 or more, and the 60 ° specular gloss is 330 or more.

The following will be described in order.
First, the scaly thin film fine powder will be described.
In the present embodiment, the scaly thin film fine powder is obtained by finely pulverizing a simple metal, an alloy, or a metal compound. More specifically, aluminum, silver, gold, nickel, chromium, tin, zinc , Indium, titanium, silicon, copper, platinum, or any one or more of a group of simple metals, or an alloy obtained by combining these groups of metals, or It is obtained by finely pulverizing any one or a plurality of oxides, nitrides, sulfides or carbides of a group of simple metals or alloys thereof.

  For example, it may be a finely pulverized aluminum simple substance, a mixture of finely pulverized aluminum simple substance and silver simple substance, or a finely pulverized alloy using aluminum. The thing may be sufficient, and what pulverized aluminum oxide may be sufficient. Anyway, in the present embodiment, the above-mentioned scaly thin film fine powder is used to obtain a metallic luster, and the material may be selected according to what kind of luster is required as the metallic luster. In the present embodiment, aluminum is used, and in the following description, the scaly fine powder assumes a scaly aluminum fine powder, and the dispersion is a dispersion of a scaly fine powder of aluminum in a solvent. And the following description will be continued. (Hereinafter, the scaly aluminum fine powder is also simply referred to as “aluminum fine powder” in the present embodiment.)

  The average thickness and the average major axis of the scale-like thin film fine powder are important for the metallic luster when a metallic pigment ink using this is applied.

  The scaly thin film fine powder according to the present embodiment literally has a scaly appearance. In other words, each individual is in a very fine powder form, but when the individual is picked up and observed, it has a scaly appearance. And when observing individual scale-like fine powder, the length from end to end is naturally different in each case in a substantially plan view, but the longest of the individual lengths is determined, The average value in the maximum length of the scaly fine powder, that is, the average major axis, which is the average value of the length from end to end, is 0.5 μm or more and 5.0 μm or less in the scaly thin film fine powder according to the present embodiment, Moreover, it is preferable that the length is the maximum, that is, the maximum major axis is 10 μm or less.

  Also, the thickness of the scale-like metal fine powder in the side view is naturally different depending on the individual, and even if it is a single metal fine powder, it does not have a completely uniform thickness if it is enlarged and observed. However, the average thickness obtained by averaging the individual thicknesses is preferably 5 nm or more and 100 nm or less in the present embodiment.

  If the scale-like thin film fine powder has an aspect ratio, that is, an average major axis / average thickness of 20 or more, more preferably 40 or more, the shape of the scale-like thin film fine powder is the same as that of the present embodiment. It means having a preferred flat shape in the form. This point will be separately described later.

  Here, when describing the average major axis, when the average major axis exceeds 5.0 μm, the scaly aluminum fine powder precipitates in an organic solvent in a short time when used as a raw material for a metallic pigment ink for an inkjet printer described later. Therefore, it becomes difficult to obtain a metallic pigment ink containing uniform scaly aluminum fine powder during coating. From this viewpoint, the upper limit is more preferably set to 1.5 μm in order to maintain a more suitably dispersed state. On the other hand, if the length is less than 0.5 μm, it will be too fine this time and it will be difficult to clearly obtain the gloss at the time of printing described later, so the average major axis is preferably 0.5 μm or more. At that time, the maximum major axis is preferably 10 μm or less. This is because, even if the average major axis is less than 5.0 μm, the inventors have found that troubles may occur during printing if the major axis exceeds 10 μm. More preferably, the maximum major axis is 5.0 μm or less. If the maximum major axis is less than 5.0 μm, the inventor has found that no trouble occurs at the time of printing. Naturally, if the maximum major axis is 5.0 μm or less, the average major axis at that time is less than 5.0 μm. The average major axis and the maximum major axis may be measured using a general measuring instrument such as a light scattering particle size distribution measuring instrument.

  As for the average thickness, if the average thickness of the flaky thin film fine powder is larger than 100 nm, as described above, when the paint using the flaky thin film fine powder is overlapped, a large useless space is generated. As a result, when the coated surface is viewed, unevenness is generated and the surface is not smooth, so that an effective metallic luster cannot be obtained.In other words, the scaly thin film fine powder according to this embodiment is not obtained. The inventor has found that an effective metallic luster can be obtained when the average thickness is 100 nm or less. In addition, the inventor has also found that the average thickness is preferably 30 nm or less in order to make the surface even smoother. However, if the thickness is less than 5 nm, it means that the scaly thin film fine powder itself is very thin, and as a result, it is too thin to obtain the originally obtained metallic luster. It is.

  As described above, in the present embodiment, by defining the numerical ranges relating to the average long diameter, maximum long diameter, average thickness, and aspect ratio of the scaly thin film fine powder in this way, it is not unnecessarily small and is unnecessarily large. No suitable flaky thin film powder of suitable size. That is, if it is too small, the scaly thin film fine powder will be agglomerated, and as a result, a large mass will be generated in the metallic pigment ink, and the agglomerated scaly thin film fine powder will precipitate. As described above, a phenomenon occurs in which the essential scaly thin film fine powder is unevenly distributed and is not suitable for actual use, and when it becomes large, nozzle clogging occurs. Therefore, as a result of inventor's earnest research to make the size not too small and not too large in the sense that it does not aggregate and settle and does not cause nozzle clogging, the above-mentioned range was determined. It was.

The average major axis and the average thickness of the metal fine powder described above were determined by the following method.
First, the average major axis was measured using a laser diffraction / scattering particle size distribution analyzer, and the 50% average particle diameter (median diameter) obtained as a result was taken as the average major axis. It should be noted that the average particle diameter in the present invention is assumed to be measured using “LMS-30” manufactured by Seishin Corporation.

  In addition, the average thickness is the thickness of the laminar thin film fine powder as it is in the laminating method used when producing the dispersion according to the present embodiment described later. As a thickness measurement, a plurality of laminated portions were measured by a fluorescent X-ray analyzer, and a value obtained as an average value was taken as an average thickness.

  Summarizing the above, when the shape of the scaly aluminum fine powder in this embodiment and various numerical ranges are as described above, printing the metallic pigment ink using this using an inkjet printer is as follows. Benefits.

  First, the metallic luster on the printed surface is good, but this is because the scaly thin film fine powder was used. As described above, the fine powder for metallic luster contained in the conventional metallic pigment ink has a substantially grain shape, but when observed from the side in a state where it is arranged in a plane, the surface becomes random unevenness. End up. In other words, as long as the surface is random unevenness, even if a light ray enters there, it is irregularly reflected, and it is difficult to obtain a desired metallic luster after all. However, since the scale-like thin film fine powder is used in the present embodiment, when the surface is observed from the side in a state where it is arranged in a plane, the surface is more planar than the case of the conventional substantially grain-shaped fine powder. It has become. That is, since the surface is relatively smooth, the incident light is reflected in substantially the same direction when a light beam is incident thereon, and as a result, the metallic gloss on the printed surface can be improved.

  In addition, the average major axis, the maximum major axis, the average thickness, and the aspect ratio are set as described above, so that the dispersion according to the present embodiment is used as a raw material for the metallic pigment ink, and the ink is used in an inkjet printer. In this case, occurrence of nozzle clogging can be suppressed. In other words, there are models available for professional inkjet printers that enable high-definition drawing, but the size of the nozzle that is the ink ejection part of the printer that can perform high-definition drawing is very small, that is, small nozzles Obviously, in order to inject the flaky thin film fine powder from the hole, the flaky thin film fine powder must be smaller than the size of the nozzle hole, so that the average major axis, maximum major axis, average thickness, aspect ratio The inventor has found that such a condition can be cleared by setting the ratio as described above.

  On the other hand, if it is too small, there is a possibility that the scaly aluminum fine powder may agglomerate, and it is understood that a certain size is necessary to prevent agglomeration. It has been found that the range is preferable.

  Now, the dispersion containing the scaly aluminum fine powder is used for the metallic pigment ink as described above. By using the dispersion according to the present embodiment, the metallic luster on the printed surface on which the metallic pigment ink is printed is used. Is superior to the conventional one. This point will be described here.

First, the metallic luster in the present embodiment will be described.
The metallic gloss of the printed surface obtained by printing the metallic pigment ink on the glossy vinyl chloride sheet can be obtained by measuring according to the JIS_Z_8741 standard. By the way, when measured using a pigment ink exhibiting a conventional metallic color, the 20 ° specular glossiness is about 80, and the 60 ° specular glossiness is about 100. It is said to be expensive.

  The purpose of obtaining the dispersion in the present embodiment is to increase this specular gloss. In general, in order to improve the metallic luster, the smoother the better the surface of the printed surface on which the pigment ink exhibiting a metallic color is printed is observed. In other words, if the surface is messy due to unevenness, the light incident on the messy surface will cause irregular reflection, and as a result, the reflected light will be visible to those who see the light reflected from the surface. Cannot be recognized, that is, the printed surface has a low glossiness. On the other hand, if the surface is very smooth, the incident light will not be diffusely reflected, and the incident light will be reflected in the same direction, so that the reflected light will be visible to those who see it. That is, it is visually recognized that the printed surface has a high glossiness.

  Therefore, when examining the dispersion liquid in the present embodiment, it is imagined that a large difference appears in the above-described surface state depending on the shape of the aluminum fine powder contained therein. That is, by applying the metallic pigment ink, it appears as if the fine aluminum powder contained in the ink is applied and the fine powder is laminated. Here, if the individual shape of the aluminum fine powder is, for example, granular, when a large number of granular materials are laminated, the surface finally becomes uneven, but if the shape of the aluminum fine powder is flat and flat, Even if these layers are laminated, it is only as if the plate-like substances are stacked, so that the surface can be relatively reduced in unevenness as compared with the case where the granular materials are laminated.

  And as a result of inventor's earnest research, in the aspect ratio in the present embodiment indicated by the average major axis / average thickness, the average major axis is 0.5 μm or more and 5.0 μm or less, and the average thickness is 5 nm or more and 100 nm or less. In the case where the aspect ratio is 20 or more, more preferably 40 or more, it has been found that the surface irregularities described above fall within an allowable range. In more detail, it has been found that the aspect ratio is preferably 40 or more when the average major axis is 0.5 to 1.5 μm and the average thickness is 5 to 30 nm. It is.

  In other words, the high aspect ratio means that the degree of flattening is further increased, and it becomes a thin scaly thin film fine powder. Therefore, when metallic pigment ink using this is applied, it is included in the metallic pigment ink. The scale-like thin film fine powder is likely to be arranged in an orderly and flat manner, that is, it has a smooth state with relatively few surface irregularities, resulting in reduced irregular reflection of incident light and a rich metallic luster. It is considered possible. Moreover, since it is flat, it is thought that even if the scaly thin film fine powders overlap each other, an unnecessarily vast space does not occur, that is, the scaly metal powders easily overlap each other in a dense state.

  Thus, as a result of measuring the printed surface with the metallic pigment ink using the dispersion containing the aluminum fine powder having an aspect ratio of 20 or more, the 20 ° specular gloss exceeds 150 and the 60 ° specular gloss is 250. Beyond. When the aspect ratio is 40 or more, the 20 ° specular glossiness exceeds 200 and the 60 ° specular glossiness exceeds 330.

  The dispersion according to the present embodiment has a configuration in which the flaky thin film fine powder described above is contained, and in the present embodiment, the flaky aluminum fine powder is contained in a solvent. Next, the dispersion liquid will be explained.

  The solvent constituting the dispersion used in the present embodiment is the same as the solvent of the metallic pigment ink, so that there is an advantage that the dispersion can be easily applied to the metallic pigment ink.

  This is because when the metallic pigment ink mainly uses an organic solvent, good weather resistance can be obtained, and it can be used well for large-size advertisements, signboards, signs and the like for outdoor use. However, when conventional organic solvents such as toluene and xylene are used, the load on the human body and the environment becomes very large. To avoid such a problem, that is, to the human body and the environment. It is important to use an organic solvent that can reduce the load of the ink as much as possible, and the ink composition in the present embodiment uses glycol ether and lactone simple substances or mixtures.

  If an organic solvent is used to reduce the burden on the human body and the environment in this way, the odor of the solvent is reduced to a level that is not usually noticed, and the person using the dispersion liquid according to the present embodiment and the surroundings to be used Compared to conventional organic solvents, the environment can be made gentler.

  Further, it is preferable that a small amount of resin used for the release layer (hereinafter also referred to as “release resin”) is attached to the aluminum fine powder. By attaching the release resin, the aluminum fine powder is further contained in the dispersion. It becomes easy to exist in a dispersed manner. In other words, because the release resin and the organic solvent glycol ether and lactone simple substance or mixture coexist in an environment where the release resin is easy to disperse, the fine aluminum powder to which the release resin is adhered is also the above organic solvent. That is, it becomes easy to disperse in a simple substance or mixture of glycol ether and lactone.

  The dispersion according to this embodiment is as described above. Next, a method for producing this dispersion will be described.

  The dispersion according to the present embodiment is a thin film layer formed by vapor-depositing or sputtering one or more of a single metal, an alloy, or a metal compound on the surface of a polymer resin film that is a base film. And a laminate manufacturing process for obtaining a laminate by laminating in this order, and a thin film layer peeling process for peeling the thin film layer from the laminate while using a solvent capable of dissolving the resin to obtain a thin film. A fine pulverizing step for finely pulverizing the thin film present in the solvent, and a concentration adjusting step for adjusting a solid content concentration in the solvent of the finely pulverized thin film after the fine pulverizing step. It becomes.

  Here, since aluminum is used in this embodiment, the thin film layer will be described as an aluminum layer and the thin film will be described as an aluminum foil.

First, the laminate manufacturing process will be described.
Although it is a polymer resin film used as a base material, this is not particularly limited and may be a conventionally known polymer resin film as long as it is widely used in the production of laminates. . For example, it may be a polyethylene terephthalate (PET) film, a polypropylene film, a polyamide film, or the like, but in the present embodiment, it is a film that is easy to handle in various meanings because it has been widely used in the past. A PET film that can be said to be present is used.

  In this embodiment, the base film is not limited to a PET film. For example, if a polymer resin film resistant to a solvent capable of dissolving a release layer described later is used as the base film. For example, since the base film is not dissolved or damaged by the solvent even after the aluminum layer peeling step described later, it can be used again as a base film, that is, a reusable base material. It should be mentioned that it can be used as a film and can be made suitable.

  A release layer is laminated on the surface of this PET film. This release layer must be easily dissolved by a specific solvent in the aluminum layer peeling step described later, and the thickness of the release layer is not particularly limited as long as it is a level that can be dissolved in a specific solvent as described later. Although it does not restrict | limit, If it becomes that content in the scaly thin film fine powder dispersion of the resin which finally comprises a peeling layer is 5 weight% or less of a scaly thin film fine powder dispersion, good.

  In the present embodiment, the release layer may be any one of polyvinyl alcohol, polyvinyl butyral, polyethylene glycol, polyacrylic acid, polyacrylamide, cellulose derivative, polyvinyl butyral, acrylic acid copolymer or modified nylon resin, cellulose acetate butyrate, and the like. In this case, it is based on cellulose acetate butyrate (CAB). The reason why a small amount of CAB adheres to the above-described aluminum fine powder is that CAB is used here. The reason for using CAB will be described later. This CAB is laminated on the surface of the PET film by a so-called known wet coating method such as a gravure coating method. More specifically, a PET film on which CAB is laminated is obtained by laminating CAB on the PET film by a gravure coating method while conveying the PET film by roll-to-roll.

  After the release layer is laminated on the surface of the PET film in this way, aluminum is then vapor-deposited on the surface to laminate an aluminum layer. In the present embodiment, the aluminum layer may be laminated by a conventionally known method, that is, a vacuum deposition method, a sputtering method, or the like. The thickness is preferably 5 nm or more and 100 nm or less, and this is as described above. This thickness is directly the thickness of the scaly aluminum fine powder in the present embodiment, and the thickness in the present embodiment is 20 nm. In addition, when trying to make this thickness into 5 nm or less, the vapor deposition film obtained does not become a continuous thing, Therefore The aluminum fine powder which has the specific shape in this Embodiment cannot be obtained. Further, if the thickness is 5 nm or less, a metallic luster cannot be obtained in the deposited film itself. Therefore, in this embodiment, the average thickness is 5 nm or more.

  In addition, it is considered that the vapor deposition is carried out while conveying the film by roll-to-roll on the surface of the CAB having a configuration of a PET film / CAB which is a long film state, as described above. Also in this embodiment, vapor deposition is performed in this manner.

  As described above, a laminate having a configuration of PET film / CAB / aluminum is obtained. In the present embodiment, the description is made in the state of being laminated on one side of the PET film. However, it may be laminated equally on both sides, and even if lamination is repeated on one side, I will add that it is okay to go. That is, it may be aluminum / CAB / PET film / CAB / aluminum, or PET film / CAB / aluminum / CAB / aluminum / (hereinafter repeated)... / CAB / PET film / CAB / aluminum / CAB...

Next, the aluminum layer peeling step will be described.
This step is to manufacture a laminate and then peel the aluminum layer from the laminate. In this embodiment, this step is performed using a solvent that can easily dissolve the release layer.

  There are various known methods for dissolving the peeling layer with a solvent and peeling the aluminum layer. For example, the following method can be considered.

  First, if the laminate is in the state of a so-called long film, the solvent is sprayed onto the entire laminate while the laminate that is in the form of a long film is conveyed by roll-to-roll. And the aluminum layer side is scraped off with respect to the laminated body in the state in which the solvent was injected, and this is removed from a base film. Then, the scraped aluminum layer is collected, and the solvent sprayed at this time may be in a state of adhering to the aluminum layer as it is. In addition, since it is expected that the peeling layer is already dissolved by the solvent and the aluminum layer is peeled off from the base film before scraping, the overall operation from the stage of injecting the solvent, It can be said that it is optimal to recover the aluminum layer together with the solvent.

  That is, by executing this aluminum layer peeling step, not only the peeled aluminum layer but also the solvent used for peeling is recovered together with the aluminum layer.

  Furthermore, actually, the release layer is not completely dissolved, that is, the aluminum layer with a part of the release layer still attached is also collected at the same time, but in this embodiment, in that state It may be the recovery of. That is, in this embodiment, a small amount of CAB is attached to the aluminum layer. The reason why this state is acceptable will be described later.

  In the present embodiment, for example, either a glycol ether type or a lactone type or a mixture is preferably used as the solvent for dissolving the release layer described above.

  More specifically, glycol ethers include methyl, n-propyl, i-propyl, n-butyl, i-butyl, hexyl, and 2-ethylhexyl aliphatic, allyl with double bonds, and phenyl groups. Ethylene glycol ethers and propylene glycol ethers are preferable examples. More specifically, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol Monohexyl ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl Ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol mono Preferred examples include ethyl ether. By the way, they are colorless and have little odor. Furthermore, since they have an ether group and a hydroxyl group in the molecule, they are liquid at room temperature with the characteristics of both alcohols and ethers. .

  Preferred examples of the lactone include γ-butyrolactone, δ-valerolactone, and ε-caprolactone.

  In this embodiment, it can be said that it is preferable to use either diethylene glycol diethyl ether (hereinafter referred to as DEGdEE) or γ-butyrolactone. In this embodiment, DEGdEE is used as a solvent. As described above, DEGdEE is used as an organic solvent with a small burden on the human body and the environment, and it can be said that it is also suitable in this respect.

  By performing the aluminum layer peeling step as described above, the aluminum layer becomes aluminum foil and is collected together with DEGdEE. That is, it is recovered as a state in which the aluminum foil with the CAB partially attached thereto is dispersed and exists in the solvent by DEGdEE.

  When a dispersion containing aluminum foil in DEGdEE is obtained in this way, the aluminum foil present in the dispersion is then made as fine as possible and finely pulverized, and then finely pulverized aluminum fine powder A concentration step of adjusting the solid content, that is, the concentration in the DEGdEE solvent is performed.

Therefore, these steps will be described next.
The method used in the pulverization step is not particularly limited, and may be performed by a conventionally known method.
In this fine pulverization step, the aluminum foil is finely pulverized and pulverized without performing the work of filtering out the aluminum foil from the DEGdEE solvent. As a result, the dispersion after the fine pulverization step is in a state in which the aluminum foil containing the DEGdEE solvent as it is is made into an aluminum fine powder having a desired size. In this case, the size of the aluminum fine powder is obtained by first pulverizing an aluminum foil laminated on a flat substrate film. Therefore, the approximate shape of each fine powder is scaly, that is, has a flat surface. It has a shape. And the average major axis which is the average value of the longest end-to-end length in the surface of the fine powder obtained is 0.5 μm or more and 5.0 μm or less, and among the longest end-to-end length in the fine powder surface The maximum major axis is desirably 10 μm or less. Regarding the thickness, as described above, the thickness at the time of lamination is directly used, and in this embodiment, the average thickness of the aluminum fine powder obtained by peeling is 5 nm or more and 100 nm or less.

  When the fine pulverization step is completed, a concentration adjustment step for adjusting the proportion of the aluminum fine powder in the DEGdEE solvent, that is, the solid content is finally executed. This concentration adjustment process does not use a special technique, and in this embodiment, the DEGdEE solvent may be adjusted so as to obtain a desired concentration as a result. For example, it is possible to concentrate the dispersion by evaporating the DEGdEE solvent, or to reduce the concentration by adding the DEGdEE solvent.

  As described above, the fine pulverization step is performed after the aluminum layer separation step. However, in order to perform the fine pulverization step more smoothly, the preliminarily peeled aluminum foil is pulverized. It is also conceivable to perform one preliminary grinding step. Therefore, this process will be described.

  Rather than finely pulverizing the aluminum foil after the aluminum layer peeling process, the aluminum foil is crushed in one step, that is, crushed to a certain size, and further crushed into pieces, that is, in two steps. It is also assumed that it is more efficient to pulverize separately.

  That is, the method of the actual first preliminary pulverization step is not particularly limited, and it can be said that the first aluminum foil may be pulverized to some extent.

  Further, when the fine pulverization step is finally performed, it is assumed that it is preferable to ensure a certain concentration of the dispersion depending on the fine pulverization method. That is, for example, there is a difference in the quality of the finally obtained dispersion liquid when pulverizing in the state of about 1% solvent and pulverizing in the state of about 20% solvent. In the case of the present embodiment, the aluminum foil obtained by first finishing the aluminum layer peeling step is present in the DEGdEE solvent used to dissolve the CAB as the peeling layer. In this state, the desired concentration is often not reached. In other words, when DEGdEE is used in a large amount, the concentration of DEGdEE solvent containing the resulting aluminum foil is too low, and even if such a solvent is used as it is in the pulverization step, desired pulverization cannot be performed efficiently. Conceivable. Therefore, in order to cope with such a situation, it can be said that it is preferable to execute a concentration step for adjusting the concentration after the first preliminary pulverization step. Actually, the aluminum foil is pulverized to a certain size by executing the first preliminary pulverization step, but the dispersion is not so suitable for use in the final pulverization step because the concentration is too low. Since only a liquid can be obtained, it can be said that it is effective to increase the concentration in the concentration step.

  And if it is judged that the pulverization state is still not perfect, that is, it is judged that the pulverization state is not yet sufficient even if trying to go through the first preliminary pulverization step and the concentration step. Furthermore, it is effective to execute the second preliminary pulverization step.

Incidentally, the method of the first preliminary pulverization step and the second preliminary pulverization step described individually may be a conventionally known method as in the case of the fine pulverization step, and further, the first preliminary pulverization step and the second preliminary pulverization step. The pulverization method in each step of the pulverization step and the fine pulverization step may be the same or all different, or any two steps may be the same and the remaining steps may be different. Absent. If necessary, it is only necessary to obtain an aluminum fine powder having a desired size in the final pulverization step. If preparation is necessary for this purpose, the first preliminary pulverization step, the concentration step, and the second step. That is, the preliminary pulverization step may be performed.
The dispersion according to the present embodiment is obtained in this way.

The description of the obtained dispersion will be further continued.
As described above, the dispersion according to the present embodiment uses DEGdEE as a solvent, but this is selected because CAB can be easily dissolved. That is, if the substance used as the solvent for dissolving CAB and the solvent used in the dispersion are the same, it is not necessary to perform extra processing, and workability can be improved. However, in the aluminum layer peeling step, CAB is not completely dissolved and is in a state of being attached to the aluminum fine powder although it is in a small amount. That is, some of the aluminum fine powder has nothing attached thereto, and some of the aluminum fine powder has CAB attached thereto.

  When the aluminum fine powder in such a state is present in the DEGdEE solvent, the detailed mechanism is unknown, but a part of the DEGdEE solvent is likely to settle, whereas a part of the aluminum fine powder is in the solvent for a long time. It was confirmed by the inventor to drift.

  That is, the combination of DEGdEE and CAB makes it difficult for aluminum fine powder with CAB to settle, while aluminum fine powder without CAB usually settles, resulting in aluminum fine powder in the dispersion. Seems to be relatively dispersed in the solvent. Although the present embodiment uses DEGdEE, it should be noted that the same phenomenon was confirmed even when γ-butyrolactone was used.

  In addition, the release layer has been described above, but if the release layer is used so that the content when the dispersion is obtained by the method described so far is 5% by weight or less of the dispersion, The inventor has found that the dispersibility of the scaly thin film fine powder is very good.

  Similarly, the thickness of the aluminum layer is 5 nm or more and 100 nm or less because if the thickness is 100 nm or more, even if CAB is attached to some of the flaky aluminum fine powder, the flaky aluminum fine powder itself This is because it has been confirmed that the above-mentioned phenomenon does not occur or hardly occurs due to the weight of the material, and when the thickness is 5 nm or less, the obtained scaly aluminum powder itself becomes too thin and easily aggregates. This is because the following phenomenon has been confirmed. Of course, other reasons such as metallic luster have already been described.

  The dispersion obtained as described above can be used as a part of raw materials for various products. Specifically, for example, when a metallic pigment ink is desired, a sufficient metallic effect can be obtained by the fact that the metal foil fine powder is unevenly distributed although the metal foil fine powder is simply mixed in the ink in the past. However, when the dispersion according to the present embodiment is mixed with the ink, the scaly thin film fine powder is easily dispersed in the ink with a suitable balance. As a result, the metallic pigment ink that easily obtains a uniform metallic luster. It can be. Further, if such ink is used as an ink for an ink jet printer, for example, since the scaly thin film fine powder is suitably dispersed in the ink as described above, the printed matter printed by the printer is not evenly distributed with metallic luster. In addition, since the scale-like thin film fine powder is not unevenly distributed or aggregated in the ink, the scale-like thin film fine powder itself or the aggregated form clogs the nozzle holes. It can be said that it can be made suitable without causing any troubles.

  The case where the dispersion according to the present invention is actually used as a raw material for a metallic pigment ink for an inkjet printer will be discussed below.

Inkjet printer used: Roland D.C. G. SP-300V made by company
Printing media used: Roland G. SV-G-610G
Metal used for scaly thin film fine powder: Aluminum 1.5 wt%
Solvent used in the dispersion: Diethylene glycol diethyl ether 61 wt%
γ-butyrolactone 15wt%
Tetraethylene glycol dimethyl ether 18wt%
Binder resin: Cellulose acetate butyrate 4wt%
Dispersant: Nonionic surfactant 0.5 wt%
How to make metallic pigment ink for inkjet printer: Scale-like thin film fine powder dispersion, solvent, binder resin, and dispersant were adjusted as described above, and adjusted to have ink characteristics with a mill or a stirrer.

A metallic pigment ink was formed using the dispersion, and this was test printed with an inkjet printer so as to have an area of 10 cm × 10 cm.
Test printing was performed on an A4 glossy vinyl chloride sheet.
Then, 20 ° specular gloss and 60 ° specular gloss on the printed surface were measured according to JIS_Z_8741 standard.
Seven types of examples and four types of comparative examples were manufactured and compared.
The results are shown in the table.

  As described above, in the case of using the dispersion liquid according to the present invention as an example, it was possible to execute printing exhibiting a desired glossiness, but in the case of a comparative example, printing may not be possible in the first place. Also, it was not possible to obtain a sufficient glossiness. In particular, those having an aspect ratio of more than 40 have a high glossiness.

  By producing a metallic pigment ink based on the scaly thin film fine powder dispersion according to the present invention and printing it using an ink jet printer, it is possible to obtain an impressive printed material with good metallic luster.

Claims (8)

A scaly thin film fine powder dispersion for use in a metallic pigment ink for an ink jet printer, wherein a scaly thin film fine powder obtained by finely pulverizing a simple metal, an alloy, or a metal compound is contained in a solvent,
Of the scaly thin film fine powder,
The average major axis, which is the average value of the entire scale-like thin film fine powder, of the longest length among the lengths from one end to the end of the one scale-like thin film fine powder in a substantially planar view, is 0.5 μm or more. 0.0 μm or less,
A maximum major axis that is the maximum of the length is 10 μm or less,
One of said scale-like thin film fine powder thickness at substantially a side view, the flaky thin der average thickness 5nm or 100nm or less the average value of the fine powder entire value of is,
The ratio of the average major axis to the average thickness of the scaly thin film fine powder, that is, the aspect ratio represented by the average major axis / average thickness is 40 or more,
As a result of measuring the metallic luster of the printed surface obtained by printing the metallic pigment ink for inkjet printer using the scale-like thin film fine powder dispersion on the glossy vinyl chloride sheet according to the JIS_Z_8741 standard, the 20 ° specular gloss is 200. above, 60 ° specular gloss of 330 or more, and Do Rukoto,
A scaly thin film fine powder dispersion characterized by On the surface of the polymer resin film that is the base film,
A release layer made of resin;
A thin film layer formed by vapor-depositing or sputtering any one or more of a simple metal, an alloy or a metal compound;
A laminate manufacturing process for obtaining a laminate by laminating the layers in this order,
A thin film layer peeling step for peeling the thin film layer from the laminate while using a solvent capable of dissolving the resin to obtain a thin film;
A pulverizing step of pulverizing the thin film present in the solvent;
A concentration adjusting step for adjusting a solid content concentration in the solvent of the finely pulverized thin film after the pulverizing step;
Is a scaly thin film fine powder dispersion for use in metallic pigment inks for inkjet printers,
Of the scaly thin film fine powder,
The average major axis, which is the average value of the entire scale-like thin film fine powder, of the longest length among the lengths from one end to the end of the one scale-like thin film fine powder in a substantially planar view, is 0.5 μm or more. 0.0 μm or less,
A maximum major axis that is the maximum of the length is 10 μm or less,
One of said scale-like thin film fine powder thickness at substantially a side view, the flaky thin der average thickness 5nm or 100nm or less the average value of the fine powder entire value of is,
The ratio of the average major axis to the average thickness of the scaly thin film fine powder, that is, the aspect ratio represented by the average major axis / average thickness is 40 or more,
As a result of measuring the metallic luster of the printed surface obtained by printing the metallic pigment ink for inkjet printer using the scale-like thin film fine powder dispersion on the glossy vinyl chloride sheet according to the JIS_Z_8741 standard, the 20 ° specular gloss is 200. above, 60 ° specular gloss of 330 or more, and Do Rukoto,
A scaly thin film fine powder dispersion characterized by The scaly thin film fine powder dispersion according to claim 1 or 2,
The metal simple substance, alloy or metal compound is one or more of a group of metals consisting of aluminum, silver, gold, nickel, chromium, tin, zinc, indium, titanium, silicon, copper, or platinum, or a group of these An alloy using a metal, or one or a plurality of oxides, nitrides, sulfides, or carbides of the group of metals or alloys thereof,
A scaly thin film fine powder dispersion characterized by The scaly thin film fine powder dispersion according to any one of claims 1 to 3,
The solvent is an organic solvent,
A scaly thin film fine powder dispersion characterized by A scaly thin film fine powder dispersion according to claim 4,
The organic solvent is either a glycol ether type or a lactone type, or a mixture thereof;
A scaly thin film fine powder dispersion characterized by A scaly thin film fine powder dispersion according to any one of claims 1 to 5,
The content of the resin in the flaky thin film fine powder dispersion is 5% by weight or less of the flaky thin film fine powder dispersion,
A scaly thin film fine powder dispersion characterized by The scaly thin film fine powder dispersion according to claim 6,
The resin is soluble in the solvent;
A scaly thin film fine powder dispersion characterized by The scaly thin film fine powder dispersion according to claim 6 or 7,
The resin is one of cellulose acetate butyrate, polyvinyl alcohol, polyvinyl butyral, polyethylene glycol, polyacrylic acid, polyacrylamide, cellulose derivative, polyvinyl butyral, acrylic acid copolymer or modified nylon resin,
A scaly thin film fine powder dispersion characterized by