JP2013043111A - Method for producing laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method which simultaneously pushes out a plurality of ink liquid layers to stack them and then dry them, while preventing the ink liquid layers from mixing with each other, to obtain a laminated body.SOLUTION: In the method for producing a laminated boy, when a plurality of ink liquid layers are stacked up, a hardly soluble substance or an insoluble substance is formed in a contact area, in which the adjacent liquid layers come in contact with each other, to prevent the adjacent liquid layers from mixing with each other, and the ink liquid layers are transcribed on a base body while keeping the structure in which the ink liquid layers are stacked, and then the ink liquid layers are cooled to reduce the fluidity of the ink liquid layers, and the ink liquid layers are dried in a fluidity-reduced state and fixed to gain the laminated body.

Description

  The present invention relates to a method for manufacturing a laminate.

  As a method for obtaining a laminate, for example, an infrared cut film and an antireflection film in the field of optical thin films are manufactured by alternately depositing an inorganic high refractive index material and a low refractive index material on a substrate alternately. Yes. However, in order to perform vapor deposition alternately while maintaining a vacuum state, it is necessary to arrange a large number of vapor deposition apparatuses in one pass, and this method requires a large apparatus. Also, it is difficult to obtain a uniform coating amount and uniform performance over a large area by vapor deposition. As another example, an organic EL light emitting device for a display is also manufactured by such a sequential deposition technique, and a barrier film is also manufactured by alternately depositing silicon oxide or aluminum oxide on the film. Similarly, it is difficult to obtain a uniform coating amount and uniform performance in a large area.

  Therefore, applying a plurality of inks sequentially to obtain a laminate is practiced in various places in the industry. For example, it has been studied to manufacture a large-area light-emitting element by sequentially applying a plurality of inks even in an organic EL light-emitting element. Alternatively, it has also been proposed to produce a barrier film by applying a lithium polysilicate ink or a polyethyleneimine ink a plurality of times. Furthermore, an infrared cut film, an antireflection film, etc., which will be described later, are manufactured by applying a high refractive index ink or a low refractive index ink on a substrate film and repeating the drying process a plurality of times.

  On the other hand, until now, there has been almost no industrial method for applying a plurality of inks simultaneously. This is because the applied inks are mixed with each other, and the multilayer ink structure cannot be maintained as it is. Slightly, the technique of simultaneous multilayer coating is practically used for the production of color photographic film and color photographic printing paper. This is because a photosensitive emulsion, color-forming coupler, antihalation layer component, etc. are used as a water-based ink containing gelatin as a binder, and a high-temperature water-based ink is extruded from a plurality of slits at a high speed on an inclined stage. After the ink liquid layer is stacked, the ink liquid layer is transferred onto a photographic film base or photographic paper base paper, and then cooled before the ink liquid layer is mixed to change the gelatin-based ink into a gel. This is a method of obtaining a thin film having a multilayer structure in a single coating step by drying the ink liquid layer without fluidity.

  In other words, by rapidly cooling a flowable high-temperature gelatin aqueous solution, gelatin is gelled to eliminate fluidity and maintain a multilayer ink layer structure. Gelatin is a layer component that forms a laminate. Functions as a binder. Since this method uses water-based ink in which water-soluble gelatin is dissolved in a water-based solvent, it has a great advantage that the load on the working environment and the surrounding environment is low as compared with the case where an organic solvent is used.

  However, since the laminate formed by the above-described method contains a gelling agent such as water-soluble gelatin, there is a problem that the water resistance and scratch resistance of the laminate are reduced. In addition, since a sufficient amount of gelation cannot be expected by adding a small amount of gelatin or other gelling agent, a large amount of gelatin or other gelling agent must be put in the ink, and the functions of other organic synthetic polymer compounds can be obtained. It is difficult to achieve sufficient expression. Therefore, if a desired amount of an organic synthetic polymer compound can be contained as a binder or a main component of the layer of the laminate, the deterioration of the water resistance and scratch resistance of the laminate can be prevented and the function of the organic synthetic polymer compound can be prevented. Therefore, the industrial applicability of the simultaneous multilayer coating technique can be greatly expanded.

As a simultaneous multi-layer method that does not use gelatin gelation, the fluidity at the interface between two adjacent ink liquid layers and the degree of mixing can be controlled by adding viscosity adjusting components such as thickeners for water-based inks. A method (see Patent Document 1) has been proposed.
In addition, at least one of two or more types of non-aqueous coating liquids contains an electron beam curable compound, and after simultaneous multilayer coating, the coating layer is cured or thickened by irradiation with an electron beam, and then dried. A method for obtaining a film (see Patent Document 2) has been proposed.

As a recent new attempt, there has been proposed a method for preventing mixing of two layers of ink by providing a mixed ink layer having a high concentration between two layers of ink, not limited to organic solvents and water. (See Patent Document 3).
There is also a method for preventing mixing of two layers by adding a mixing preventing component to either one of the two adjacent layers and precipitating and unevenly mixing the mixing preventing component at the interface between the two layers when the two inks come into contact with each other. It has been proposed (see Patent Document 4).
Furthermore, a method has also been proposed in which a complex reaction is caused between two adjacent organic solvent inks to form a film at the interface between the two liquid layers to prevent mixing of the two layers (Patent Document). 5).

  In addition, as a method of stacking a plurality of inks in layers, for example, ink is extruded from a slit of a die coating unit having a plurality of slits provided on a slide slope, and the ink liquid layer is lowered when the ink falls along the slope. It is possible to stack one after another by riding on the ink liquid layer. Alternatively, a plurality of ink liquid layers can be stacked by flowing ink in a curtain form from a plurality of slit nozzles installed above the slide slope. The slide slope according to the present invention is not necessarily limited to a flat plane, and may have a structure in which ink falls by gravity, and the slide plane viewed from the side may be curved.

  In the present invention, “ink” is not particularly limited to those containing a color pigment, and transparent ink is also included as ink.

Japanese Examined Patent Publication No. 63-20584 JP-A-61-74675 JP 2010-110551 A JP 2010-110552 A JP 2011-72880 A

  Since the method of Patent Document 1 must strictly control the viscosity of adjacent inks, it can cope with changes in viscosity due to temperature changes in the environment and drying of the ink in continuous application work for a long time. There are difficulties associated with maintaining product uniformity.

  The method of Patent Document 2 must always use an electron beam curable resin, needs to be equipped with a special device, and is limited in the type of ink used, and cannot be used as a general-purpose coating method. .

  The method of Patent Document 3 cannot be applied to applications in which the presence of a mixed layer causes a problem because a mixed layer of two adjacent inks always exists between the ink layers of adjacent inks. For example, it cannot be used for the production of an infrared reflection film or an antireflection film that requires a clear change in refractive index difference between layers.

  The method of Patent Document 4 is a mechanism that protects the interface between the two ink layers with a substance that precipitates by a solvent shock when the ink of the adjacent ink comes into contact with the solvent of the other ink. Adjacent ink solvents need to have different solubilities of deposited substances, and cannot be applied when adjacent inks are the same solvent.

  In the method of Patent Document 5, an insoluble material is formed by complex formation of a low molecular ligand and a metal ion at the liquid layer interface between adjacent inks, and the first ink and the second ink are mixed at the interface. However, the ink is an organic solvent-based ink and not the water-based ink of the present invention. Moreover, it has not been examined to reduce the fluidity of the ink liquid layer before the drying process of the stacked ink liquid layers, and there is no description suggesting it.

  In the present invention, even when a plurality of water-based inks containing an organic synthetic polymer compound are extruded at the same time, and a plurality of ink liquid layers are stacked, the ink liquid layers adjacent to each other are less likely to mix with each other, and the laminated structure is maintained. It is a new way of manufacturing the body.

  A first invention for achieving the above object is to simultaneously extrude a plurality of water-based inks containing an organic synthetic polymer compound to stack a plurality of ink liquid layers, and when the ink liquid layers are stacked, Insoluble matter or insoluble matter is generated in the middle to prevent mixing between the ink liquid layers. After that, the ink liquid layer is applied to the substrate while maintaining the laminated structure of the stacked ink liquid layers, and then the ink liquid layer is cooled to After reducing the fluidity of the ink liquid layer of all parts or all of the ink liquid layer, the ink liquid layer is dried and fixed, so that the components in the ink containing the organic synthetic polymer compound are layered on the substrate. This is a method for producing a laminated body.

  A second invention that achieves the above object is characterized in that the hardly soluble substance or the insoluble substance is generated by any one of a crosslinking reaction, a complex formation reaction, a salting out reaction, and a neutralization reaction. It is a manufacturing method of this laminated body.

  A third invention for achieving the above object is characterized in that at least one of the plurality of water-based inks contains one of gelatin, agar, carrageenan, xanthan gum, gum arabic, and guar gum. A method for producing a laminate according to the invention or the second invention

  According to a fourth aspect of the invention for achieving the above object, the laminate is any one of an infrared reflective film, a sublimation transfer recording image receiving sheet, an antireflection film, and a heat radiating sheet. It is a manufacturing method of the laminated body in any one of.

  In the present invention, even when a plurality of water-based inks containing an organic synthetic polymer compound are extruded at the same time and a plurality of ink liquid layers are stacked, the degree to which adjacent ink liquid layers are mixed with each other is small and the laminated structure is maintained. This is a new method for producing a laminate.

It is a schematic cross section which shows one Embodiment of the manufacturing method of the laminated body of this invention. It is a model perspective view of an example of the die coating unit which can be used for the manufacturing method of the laminated body of this invention.

  The present invention relates to a method for producing a laminate, wherein a plurality of aqueous inks containing an organic synthetic polymer compound are simultaneously extruded to stack a plurality of ink liquid layers, and when the ink liquid layers are stacked, Insoluble matter or insoluble matter is generated in the middle to prevent mixing between the ink liquid layers, and then transferred to the substrate while maintaining the laminated structure of the stacked ink liquid layers. After reducing the fluidity of the ink liquid layer of all parts or all of the ink liquid layer, the ink liquid layer is dried and fixed, so that the components in the ink containing the organic synthetic polymer compound are layered on the substrate. The present invention relates to a method for manufacturing a laminated body.

  In the present invention, the number of layers excluding the substrate may be any number as long as it is 2 or more, and the number of ink liquid layers where a hardly soluble material or insoluble material is generated may be any number as long as it is 1 or more. The organic synthetic polymer compound only needs to be contained in two or more water-based inks among a plurality of water-based inks, and the component that reduces the fluidity of the ink liquid layer when cooled is 1 of the plurality of water-based inks. It may be contained in the above water-based ink. In addition, the hardly soluble or insoluble matter includes an ink liquid layer formed from at least one of water-based inks containing an organic synthetic polymer compound, and an ink liquid layer on at least one side adjacent to the ink liquid layer. It may be generated during. Furthermore, at least when the ink liquid layer is stacked, it is sufficient that a hardly soluble or insoluble material is generated between the adjacent ink liquid layers, and even after the ink liquid layer is stacked, the hardly soluble or insoluble material is generated. You may keep doing.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an embodiment of a method for producing a laminate according to the present invention.
A die coating unit 11 has slits 1, 2, and 3 for extruding ink. Of course, the number of slits is not limited to 3 and can be any number. FIG. 2 is a schematic perspective view of an example of the die coating unit 11.

  The method of stacking the ink by pushing it out from the slit includes a method in which a plurality of slit nozzles are arranged above the slide slope, the solution is poured in a curtain form from above and stacked on the slide slope, and is not limited to the coating method of FIG.

  In this embodiment, when the ink liquid layers are stacked, the reaction component contained in one of the aqueous inks forming the adjacent ink liquid layer reacts with the reaction component contained in the other ink to be adjacent to each other. A case where a hardly soluble or insoluble matter is generated with respect to at least one of the inks between the ink liquid layers and a gelling agent is used will be described. Here, one water-based ink is referred to as a first ink, and the other water-based ink is referred to as a second ink for convenience. At least one or both of the first ink and the second ink contain an organic synthetic polymer compound, and at least one or both of the first ink and the second ink are gelling agents. Contains. The first ink and the second ink are prepared using an aqueous solvent.

  The first ink is stored in the tank 1t and the tank 3t of FIG. 1, and the second ink is stored in the tank 3t. Although not shown, the number of tanks is not limited to three, and an arbitrary number can be set.

  When the first ink and the second ink are pushed out by the pressurizing pump 1p, the pressurizing pump 2p, and the pressurizing pump 3p and flow out of the slits 1, 2, and 3, they flow down the slope of the die coating unit 11. At this time, the first ink flowing out from the slit 1 spreads on the die coating unit to form an ink liquid layer 1s.

  Similarly, the second ink flowing out from the slit 2 forms an ink liquid layer 2s and flows down. When the ink liquid layer 2s comes into contact with the ink liquid layer 1s, the reaction component contained in the first ink reacts with the reaction component contained in the second ink, and at least one of them reacts. A substance that is sparingly soluble or insoluble in one of the inks is produced, preventing mixing between the ink liquid layers. Here, the fact that mixing between the ink liquid layers is prevented means that a laminated structure of the ink liquid layers in which the ink liquid layers and the ink liquid layers are stacked is formed, and the components contained in the ink liquid layer Does not mean that the ink does not mix near the boundary between the ink layers.

  When a hardly soluble substance or an insoluble substance (referred to as X for convenience) is generated, the second ink is blocked by X and cannot be mixed into the first ink liquid layer 1s, and the formed X is The ink liquid layer 2s is formed on the ink liquid layer 1s while being sandwiched, and 1s and 2s are stacked. Similarly, the first ink flowing out from the slit 3 is stacked on the ink liquid layer 2s of the second ink to form an ink liquid layer 3s made of the first ink. By alternately extruding the first ink and the second ink in this way, the ink liquid layers are similarly stacked even if the ink is extruded from four or more slits.

  The substrate 6 held by the coating roll 4 is guided to the coating roll rotating at high speed, and scoops up the stacked ink liquid layers 1s, 2s, 3s,... Which are about to flow down from the end of the die coating unit. Two or more stacked ink liquid layers are applied to the substrate while retaining the stacked layer structure.

When two or more stacked ink liquid layers applied while retaining the stacked layer structure are transported to the cooling zone 5 and cooled, the ink liquid layer formed from the ink containing the gelling agent The viscosity increases and the fluidity of the ink liquid layer decreases.
The ink components of adjacent layers are mixed by drying a layered body of ink liquid layers with reduced fluidity in the drying zone 7 while maintaining the stacked ink liquid layer structure. And a laminate having a uniform coating thickness can be obtained.

  When the two or more applied ink liquid layers are rapidly cooled in the cooling zone 5, the ink liquid layer dissolves in water at a high temperature but gels at a low temperature in order to reduce the fluidity of the ink liquid layer. A small amount of gelling agent is added. The added amount does not gel the entire ink liquid layer, but an amount sufficient for the gelling agent to decrease the fluidity of the ink liquid layer by increasing the viscosity at the gelation temperature.

  Among the laminates, organic synthetic polymer compounds give durability, strength and other necessary performance to the laminate, and a small amount of gelling agent is added, so the original performance desired by the laminate It has little effect on

  The reason for reducing the fluidity of the ink liquid layer before drying the laminate is that when the ink liquid layer is sent to the drying zone 7 with high fluidity, mixing between the ink liquid layers is hindered, but the airflow This is because the liquid moves irregularly due to the influence of the above, contact with the guide roll, etc., and the film thickness tends to be nonuniform. When the fluidity of the ink liquid layer is lowered, it becomes difficult to be affected by irregular forces from the outside, and a uniform multilayer coating film can be obtained. In addition, even if the ink liquid layer is thick, a laminate having a uniform layer can be obtained without moving the liquid.

  The coating amount of each ink liquid layer of the laminate is controlled by the amount of ink pushed out from the slit of the die coating unit and the conveyance speed of the substrate 6. By increasing the conveyance speed of the substrate 6, it is possible to apply a thin film even if the amount of ink extrusion is the same. In the method for producing a laminate of the present invention, the degree of mixing of ink between a plurality of layers is small, and a uniform multilayer laminate having a large area can be obtained by one application.

The method for confirming that the laminate is formed may be as follows. First, the cross section of the laminate is sliced into thin films and observed with an optical microscope or an electron microscope to confirm the laminate structure.
Moreover, the method for confirming whether the laminated structure is based on the production method of the present invention can be confirmed by glow discharge emission spectrometry.

  The glow discharge emission spectroscopic analysis method is an analysis method in which a thin film material is sputtered from the surface to perform elemental analysis, and elemental analysis from the surface to the inside is possible. The amount of elements at various depths from the surface is a method that can specifically analyze the amounts of carbon, hydrogen, nitrogen, oxygen, sulfur, titanium, silica, aluminum, etc. in the depth direction.

In the laminate according to this production method, two adjacent water-based inks come into contact with each other, the component contained in one ink reacts with the component contained in the other ink, and at least one of the inks A substance that is hardly soluble or insoluble is formed. Those difficultly soluble substances and insoluble substances have specific components in the two ink liquid layers reacting specifically or selectively, so that the specific components that form the hardly soluble substances and insoluble substances are aggregated intensively. Thus, the element composition different from the original composition of the ink is shown.
Therefore, if a region showing a specific element configuration is observed by glow discharge emission spectrometry near the boundary of the layer where the laminated structure can be confirmed, it can be confirmed that the layer is manufactured by the manufacturing method of the present invention.

(Water-based solvent used for water-based ink)
The water-based ink used in the present invention utilizes water and / or a water-soluble solvent as a solvent or dispersion medium. As the water, ion-exchanged water, distilled water, or the like can be used. Examples of the water-soluble solvent include alcohols such as methanol and propanol, ketones such as acetone, methyl ethyl ketone, and pyrrolidone, and polyhydric alcohols such as diethylene glycol and glycerin.
It is preferable that water is a main component from the viewpoint of environmental protection when the present invention is industrially implemented, and the ratio of water in the aqueous solvent in that case is the amount of environmental conservation when the present invention is industrially implemented. From the viewpoint of solubility and dispersibility of the organic synthetic polymer or gelling agent, it is preferably 80% by mass or more, more preferably 90% by mass or more, more preferably 95% by mass or more, and still more preferably substantially 100%. % By mass.

(Chemical reactions and reaction components used in the present invention)
When two adjacent inks come into contact with each other, the reaction component contained in one ink reacts with the reaction component contained in the other ink and is hardly soluble or insoluble in at least one of the two inks. Various reactions can be used for the reaction for forming the substance, and it is not particularly limited. For example, (A) a reaction between a crosslinkable polymer and a crosslinking agent, (B) a complex formation reaction between a metal ion and a polymer having a ligand or a low molecule having a ligand, (C) hydration Salting out reaction to remove hydrated water from dissolved polymer, (D) neutralization reaction between basic polymer and acidic polymer, (E) neutralization reaction between basic polymer and acid, (F) acidic Reactions such as a neutralization reaction between a polymer and a base and a neutralization reaction between (G) an acid and a base can be used.

Hereinafter, specific usable chemical reactions and reaction components will be described.
(A) Crosslinking reaction For example, by using a crosslinkable polymer as the component (a) to be contained in one ink and using a crosslinking agent as the component (b) to be contained in the other ink, A cross-linking reaction occurs in the contact area. The cross-linked product, which is a product of the cross-linking reaction, is hardly soluble or insoluble in water, and is present between the two ink layers in a hardly soluble or insoluble state, thereby mixing the two adjacent ink liquid layers. The degree to do can be reduced.

  Although it does not restrict | limit especially as a crosslinkable high molecular compound of a component (a), For example, high molecular compounds, such as polyvinyl alcohol, polyphenol, polycarboxylic acid, etc. which have a hydroxyl group, a carboxyl group, etc. are mentioned. Examples of the polymer compound having an amino group include diallylamine hydrochloride polymer, allylamine hydrochloride polymer, diallylamine hydrochloride / maleic acid copolymer, and the like. These may be used individually by 1 type and may use 2 or more types together. From the viewpoint of solubility in a solvent, the crosslinkable polymer compound preferably has a weight average molecular weight of 5,000 to 300,000, more preferably 30,000 to 200,000, and more preferably 50,000 to 150,000. Further preferred.

  Examples of the crosslinking agent for component (b) include crosslinkable titanium compounds such as titanium hydroxide and organic titanium chelate compounds; crosslinkable zirconium compounds; amino resins such as urea resins and melanin resins; hexamethylene diisocyanate and tolylene diene. Polyisocyanate compounds such as isocyanate, xylylene diisocyanate, isophorone diisocyanate; adipic acid diglycidyl ester, phthalic acid diglycidyl ester, terephthalic acid diglycidyl ester, pentaerythritol polyglycidyl ether, glycerin polyglycidyl ether, trimethylpropane polyglycidyl ether, neo Pentyl glycol polyglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene Glycol diglycidyl ether, polypropyleneylene glycol diglycidyl ether, 2,2-bis- (4′-glycidyloxyphenyl) propane, tris (2,3-epoxypropyl) isocyanurate, bisphenol A diglycidyl ether, hydrogenated bisphenol Epoxy compounds such as A diglycidyl ether; carbodiimide compounds; vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylethoxysilane, N- [2- (vinylbenzylamino) ethyl]- Examples include silane coupling agents such as 3-aminopropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, and γ-methacryloxypropyltrimethoxysilane. These may be used individually by 1 type and may use 2 or more types together.

  When using this crosslinking reaction, the organic synthetic polymer compound in the ink containing the crosslinking agent is non-crosslinkable (non-crosslinkable organic synthetic polymer compound) that does not react with the crosslinking agent. As such, water-based acrylic resins, water-based polyester resins, emulsions of various synthetic resins, and the like are preferable.

  When a crosslinking reaction is used, the content of the components in the ink excluding extender pigment is preferably 1 to 30% by weight, more preferably 2 to 20% by weight, and still more preferably, for the crosslinkable polymer compound. It is 8 to 15% by weight, and the crosslinking agent is preferably 0.5 to 20% by weight, more preferably 0.5 to 10% by weight, and further preferably 1 to 8% by weight.

(B) Complex formation reaction For example, when a ligand is used as component (c) and an ionic substance is used as component (d), a complex formation reaction occurs in a region where two inks meet. The complex which is a product of the complex formation reaction is hardly soluble or insoluble in water, and can exist between the two ink liquid layers in an insolubilized state, thereby preventing mixing between adjacent ink liquid layers.

Examples of the ligand of the component (c) include phosphorus-containing ligands such as phosphorous acid, phosphoric acid, and polyphosphoric acid; carboxylic acid-containing ligands such as acetic acid, hydroxyl groups, thiol groups, and amino groups. And a ligand containing an amide group, a pyridine group or the like. Synthetic polymers having these ligands can also be used. Examples of the ionic substance of component (d) include calcium ions, magnesium ions, iron ions, copper ions, manganese ions, molybdenum ions, and zinc. The substance is not particularly limited as long as it is a substance serving as an ion source such as ions, cobalt ions, boron ions, and aluminum ions. Examples thereof include aluminum sulfate, cobalt sulfate, calcium hydroxide, and magnesium hydroxide.

  When the complex formation reaction is used, the content of the component in the ink excluding the extender pigment is preferably 5 to 30% by weight, more preferably 5 to 20% by weight in the ink with respect to the ligand content. More preferably, it is 5 to 15% by weight, and the content of the coordination polymer is generally 1/3 to 1/10 of the low molecular weight ligand, although it depends on the structure of the material. The ionic substance is preferably 0.1 to 10% by weight, more preferably 0.5 to 7% by weight, and further preferably 1 to 5% by weight in the ink.

(C) Aggregation reaction by salting out For example, by using a polymer compound as the component (e) and using an electrolyte as the component (f), salting out occurs where the electrolyte takes away the solvent around the aggregating polymer compound, As a result, the aggregation reaction of the polymer compound proceeds in a region where the two inks meet. Aggregates, which are products of the aggregation reaction, are hardly soluble or insoluble in water, and are present between two adjacent ink layers in an insolubilized state, thereby preventing mixing of the two adjacent ink liquid layers. Can do.

Examples of the polymer compound of component (e) include hydrophilic polymer compounds having a hydroxyl group or a carboxyl group, such as polyvinyl alcohol, polyphenol, polycarboxylic acid and the like. These may be used individually by 1 type and may use 2 or more types together.
As the electrolyte of the component (f), known ones can be used. Binary electrolytes such as sodium chloride and calcium chloride; ternary electrolytes such as barium chloride; Electrolyte; Examples include proteins and polymer electrolytes such as polymethacrylic acid.

  When utilizing this agglomeration reaction, it is necessary to use a polymer compound that does not cause salting out as an organic synthetic polymer in the ink containing the electrolyte, such as an aqueous acrylic resin, An aqueous polyester resin, or a synthetic polymer emulsion that is stable even in the presence of a salt is preferred.

  In the case of utilizing agglomeration reaction by salting out, the content of the component in the ink excluding the extender pigment is preferably 4 to 30% by weight, more preferably 5 to 20% by weight, with respect to the content of the polymer compound. More preferably, it is 8-15 weight%, About electrolyte, Preferably it is 0.5-10 weight%, More preferably, it is 1-7 weight%, More preferably, it is 1-5 weight%.

(D) Neutralization reaction between acid and base For example, by using an acid as the component (g) and a base as the component (h), in the region where two adjacent ink layers are in contact with each other, A sum reaction occurs. The salt, which is a product of the neutralization reaction, is hardly soluble or insoluble in water and exists between the two adjacent ink liquid layers in an insolubilized state, thereby mixing the two adjacent ink liquid layers. Can hinder.

Examples of the acid of the component (g) include weak acids such as acetic acid, formic acid and carbonic acid, and synthetic polymers such as polycarboxylic acid and cationic polyvinyl alcohol.
Examples of the base of the component (h) include weak bases represented by organic amines and nitrogen-containing heterocyclic aromatic compounds such as monoethanolamine, diethanolamine, triethanolamine, pyridine, benzidine, aniline, quinoline, and acrylamide. -Synthetic polymers such as sodium acrylate copolymer.

  When utilizing the neutralization reaction of an acid and a base, the content of the components in the ink excluding extender pigments is preferably 1 to 30% by weight, more preferably 1 to 30% by weight, respectively, with respect to the acid and base contents. Is 1 to 20% by weight, more preferably 5 to 15% by weight.

Materials that can be used in the production method of the present invention will be described below.
(Organic synthetic polymer)
The organic synthetic polymer compound is contained in water-based ink and functions as a binder or / and a main component of the layer of the laminate produced in the present invention. The organic synthetic polymer compound is not particularly limited as long as it can be dissolved or dispersed in an aqueous solvent. Those that are soluble in an aqueous solvent are preferred. Examples of the organic synthetic polymer compound that is generally highly soluble in the aqueous solvent include hydroxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose. Polyvinyl alcohol (PVA) having a saponification degree of 50 mol% or more (preferably 70 mol% or more) and its derivatives, polystyrene sulfonic acid having a sulfonation degree of 50 mol% or more (preferably 70 mol% or more), and a saponification degree of 50 mol% Above (preferably 70 mol% or more) ethylene-vinyl alcohol copolymer, polyacrylic acid and its salt, aqueous acrylic resin, polyvinyl pyrrolidone, polyethylene glycol, alginates, aqueous Riesuteru resins, aqueous polyurethane resins, aqueous epoxy resin, aqueous polyolefin resin, aqueous phenolic resin, poly-para vinylphenol and the like. These may be used individually by 1 type and may use 2 or more types together. Among these, from the viewpoint of film formability and film thickness uniformity, an aqueous acrylic resin, an aqueous polyester resin, and polyparavinylphenol are preferable.
“Aqueous” means water-soluble, and there are no particular restrictions on the production method, but it is easy to use commercially available products in all cases.

  Examples of the aqueous acrylic resin include a copolymer of acrylic acid and (meth) acrylic acid alkyl ester or other polymerizable monomer. Examples of (meth) acrylic acid alkyl esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isopropyl (meth) acrylate, (meth) Examples include isobutyl acrylate, 2-ethylhexyl (meth) acrylate, n-hexyl (meth) acrylate, and lauryl (meth) acrylate. Other polymerizable monomers include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, acrylamide, N-methylol acrylamide, diacetone acrylamide, glycidyl (meth) acrylate, styrene, vinyl toluene, Examples include vinyl acetate, acrylonitrile, vinyl alcohol, and ethylene. For example, commercially available products such as “Watersol (registered trademark)” series manufactured by DIC Corporation may be used.

  The water-based polyester resin includes, for example, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, 1,6-hexanediol, neopentyl glycol, triethylene glycol, bisphenol hydroxypropyl ether, glycerin, trimethylolethane, and trimethylolpropane. , Dehydration condensation with polybasic acids such as phthalic anhydride, isophthalic acid, terephthalic acid, succinic anhydride, adipic acid, sebacic acid, maleic anhydride, itaconic acid, fumaric acid, etc. It can be obtained by adding and dispersing in water. In addition, for example, commercially available products such as “Vylonal (registered trademark)” series manufactured by Toyobo Co., Ltd. may be used.

  The hydroxyl value of the aqueous polyester resin is preferably 5 to 30 KOH mg / g, more preferably 10 to 25 KOH mg / g, and still more preferably 10 to 20 KOH mg / g. The acid value of the aqueous polyester resin is preferably 3 KOHmg / g or less. The glass transition temperature of the aqueous polyester resin is preferably 50 to 90 ° C, more preferably 60 to 85 ° C, and still more preferably 70 to 85 ° C.

Polyparavinylphenol is a homopolymer of paravinylphenol, and a commercially available product can be used. Examples of the commercially available products include “Marcalinker (registered trademark)” series manufactured by Maruzen Petrochemical Co., Ltd.
Specific examples of polyvinyl alcohol derivatives include carboxylated polyvinyl alcohol, sulfonated polyvinyl alcohol, acetoacetylated polyvinyl alcohol, and mixtures thereof.

  The weight average molecular weight of the organic synthetic polymer compound is preferably 5,000 to 1,000,000, more preferably 10,000 to 100,000, and still more preferably 10,000 to 50,000. In the present specification, the weight average molecular weight is a value in terms of polystyrene measured by gel permeation chromatography (GPC).

(A component that reduces the fluidity of the ink layer when cooled)
The component that reduces the fluidity of the ink liquid layer when cooled is not particularly limited as long as it exhibits its function. Since the handling in manufacture is easy, a gelling agent can be used suitably. A gelling agent is a material that transitions from a highly fluid sol state to a less fluid gel state by cooling. As a gelling agent, it has good solubility or dispersibility in an aqueous solvent, supplements moisture by hydrogen bonding, and has the effect of increasing the viscosity of aqueous ink even with a small amount, so gelatin, agar, carrageenan, xanthan gum, Gum arabic and guar gum are particularly preferred. Gelatin has a gelation temperature of about 15 to 20 ° C. and is easy to handle in production, so that gelatin is most preferably used. However, other gelling agents are particularly considered if they are produced in consideration of the respective gelation temperatures. There is no problem.
The amount of the gelling agent added to the ink excluding the extender is preferably 0.2 to 5.0% by weight. Adding too much is not preferable because it causes mold and decay.

(Substrate)
The substrate is not particularly limited as long as it can support the laminated structure of the applied ink liquid layer. For example, a film of glass, metal, or polymer compound can be suitably used.

(External pigment)
Further, extender pigments can be added to the ink as optional components. Extender pigments are white or transparent inorganic particles that are used for matting and dilution of other colored pigments; aluminum hydroxide, calcium carbonate, titanium oxide, barium sulfate, silicon oxide, talc, calcium sulfate Bentonite, barium titanium, zinc oxide, etc. are used.

A pigment prepared in fine particles and dispersed in a binder is used to adjust the refractive index of the optical film. High refractive index materials used for infrared reflective film and antireflection film are rutile titanium oxide, anatase titanium oxide, lead oxide, iron oxide, tungsten oxide, indium oxide, tin oxide, zinc oxide, cerium oxide, oxide There are bismuth, zirconium oxide, niobium oxide, tantalum oxide, etc. Among these, those that can be prepared as fine particles can be used. Particularly preferred are titanium oxide and tin oxide.
Examples of the low refractive index material include silicon oxide, aluminum oxide, sodium fluoride, magnesium fluoride, lithium fluoride, calcium fluoride, and silicon oxide and aluminum oxide are particularly preferable.

  Further, the ink may further contain various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, a leveling agent, an antifoaming agent, and a filler as required.

(Uses in which the production method of the present invention is suitably used)
Examples of applications in which the production process is greatly improved by utilizing the method for producing a laminate of the present invention include production of an infrared reflection film, an antireflection film, a sublimation transfer recording image receiving sheet, and a heat dissipation film. Hereinafter, the features of the infrared reflective film will be described as an example.

  Infrared reflective film is used by sticking to the window glass of buildings and vehicles (cars, trains, buses, airplanes, ships, etc.) for the purpose of blocking infrared rays and preventing the indoor temperature from rising, or for agricultural houses. Are also used for similar purposes. Since the infrared reflection film reflects only infrared rays and transmits visible light, it is possible to turn on the light in the room or to visually recognize the outside from the room through the infrared reflection film. As an infrared reflection film, an infrared reflection film is known in which an infrared reflection performance is improved by laminating a large number of inorganic materials having different refractive indexes on a light-transmitting substrate by vapor deposition. In addition, a method of manufacturing an infrared reflective film using a tandem coating method in which coating and drying processes are repeated is also known.

  However, the vapor deposition method requires a large-scale vacuum vapor deposition apparatus, and the sequential coating method repeats the coating and drying of each refractive index layer by the number of layers. Impurities cannot be avoided. Moreover, it is not easy to achieve both high infrared reflectivity and high visible light high transmittance, and a film with high infrared reflectivity tends to have a low visible light transmittance and a large weight, A film with high transmittance tends to have low infrared reflection performance. The infrared reflection performance is higher as there are more interfaces having different refractive indexes. The film thickness of each layer only works for light absorption and does not contribute to reflection performance. Therefore, when each layer becomes thick, the transmittance of visible light decreases.

  In the method of the present invention, a laminate of thin films can be obtained by increasing the conveyance speed of the substrate. Therefore, even a multilayer can be made into a thin film, and thus a laminate having high visible light transmittance and high infrared reflection performance. A body film can be obtained.

  Moreover, the manufacturing method of the laminated body of this invention is an optimal method for manufacture of optical films, such as an antireflection film using the refraction phenomenon of an interface similarly to an infrared reflective film. Furthermore, the production method according to the present invention is characterized in that it can also be used in the production method of a laminate comprising a thin film layer and a relatively thick layer. It is.

  The production of an infrared reflection film, an antireflection film, a sublimation transfer recording image receiving sheet, and a heat dissipation film using the production method of the present invention will be described below along some examples.

(Example 1, Infrared reflective film manufacturing method 1)
The infrared reflective film of the example is an infrared reflective film in which two or more layers having different refractive indexes are alternately laminated on a light-transmitting substrate, and each layer includes a refractive index adjusting component of an extender pigment, An organic synthetic polymer compound is contained as a binder. Examples of the refractive index adjusting component include titanium oxide, zirconium oxide, tin oxide, indium oxide, silicon oxide, and antimony oxide. The refractive index adjusting component may be used alone or in combination of two or more. The shape of the refractive index adjusting component is not particularly limited, but the particle size is preferably 0.5 μm to 10 μm, more preferably 1 μm to 5 μm, from the viewpoints of reflectivity and transparency. Such a refractive index adjusting component may be synthesized, but it is convenient to use a commercially available sol-like dispersion. Dispersions of titanium oxide, silicon oxide, tin oxide and the like are known. The refractive index difference between adjacent layers is preferably in the range of 0.1 to 0.4. In the case of an infrared reflective film in which three or more layers are laminated, the difference in refractive index between adjacent layers may be within the above range, and the difference in refractive index between all adjacent layers need not be the same.

  In order to produce an infrared reflective film by the production method of the present invention, at least one of the stacked inks contains, as a reaction component, a polymer compound having a reactive group that reacts with metal ions. The ink that forms the ink liquid layer adjacent to the ink liquid layer formed from the ink preferably contains a metal ion as a reaction component.

  In the case of an infrared reflective film having three or more layers laminated, from the viewpoint of infrared reflectivity, transparency, and durability, the polymer compound having the reactive group must be in one layer no matter which two adjacent layers are seen. In order to prevent mixing between the liquid layers, it is desirable that it is contained. In addition, from the viewpoint of infrared reflectivity, layers having different refractive indexes are alternately stacked in an odd number, and the refractive index of the first layer from the light-transmitting substrate is higher than the refractive index of the second layer, and the outermost layer It is necessary that the refractive index be higher than the refractive index of adjacent layers (that is, one inner layer).

  Example 1 is an example of manufacturing an infrared reflective film by using a cross-linking reaction between a polymer having a hydroxyl group and a titanium chelate to prevent mixing between ink liquid layers to obtain a multilayer structure.

(High refractive index layer forming ink 1 composition)
Components of the following composition were blended to prepare a high refractive index layer forming ink 1 composition.
Titanium compound “Olgatix (registered trademark) TC-400”: 5 parts by weight “Matsumoto Fine Chemical Co., Ltd., component; titanium diisopropoxy bis (triethanolaminate, component concentration 80% by weight, titanium content 8.3” weight%)"
Water-based polyester resin “Vylonal (registered trademark) MD-1500”: 104 parts by weight “manufactured by Toyobo Co., Ltd., weight average molecular weight = approximately 20,000, solid content concentration 30% by weight”
Titanium oxide dispersion “AERODISP (registered trademark) W740X”: 336 parts by weight “Nippon Aerosil Co., Ltd., solid content 40% by weight”
Water: 118 parts by weight

  For the measurement of the refractive index, after coating the water-based ink for the high refractive index layer on the light-transmitting substrate, the coating film is formed by drying in an oven at 120 ° C. for 3 minutes. The refractive index was 1.55 when the refractive index was measured using a refractometer “DVA-36L type” (light source: sodium D line, measurement wavelength: 589 nm, manufactured by Mizoji Optical Co., Ltd.).

(Low refractive index layer forming ink 1 composition)
Components of the following composition were blended to prepare a low refractive index layer forming ink 1 composition.
Polyvinyl alcohol “manufactured by Kanto Chemical Co., Ltd., weight average molecular weight = about 100,000”: 8 parts by weight aqueous acrylic resin “Watersol (registered trademark) PW-1100”: 52 parts by weight “manufactured by DIC Corporation, weight average molecular weight = about 50,000, 45% solids water emulsion "
Silicon oxide dispersion “AERODISP (registered trademark) W1836”: 352 parts by weight “Nippon Aerosil Co., Ltd., solid content 34% by weight”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 3 parts by weight Water: 92 parts by weight

  For the measurement of the refractive index, after coating the water-based ink for the low refractive index layer on the light-transmitting substrate, it is dried in an oven at 120 ° C. for 3 minutes to form a coating film. When the refractive index was measured using a refractometer “DVA-36L type” (light source: sodium D line, measurement wavelength: 589 nm, manufactured by Mizoji Optical Co., Ltd.), the refractive index was 1.39.

  The temperature of the ink for applying each of these layers is preferably 25 ° C to 60 ° C, more preferably 30 ° C to 50 ° C. In particular, when the ink contains gelatin, the temperature of the ink is preferably 33 ° C to 45 ° C.

  The temperature of the cooling zone is 15 ° C. or less, and the cooling process time is preferably 5 seconds or more and less than 30 seconds. If the cooling is insufficient, the layer will flow and the uniformity of the layer will deteriorate. When gelatin alone is used as a binder, if the cooling time is lengthened, it takes time to dry the water and the productivity is lowered. However, since the gelatin content is low in the production method of the present invention, it takes too long to dry the water. There is no significant impact.

(Simultaneous multilayer coating)
The high refractive index layer forming ink 1 is filled in the 1 t tank of FIG. 1, the low refractive index layer forming ink 1 is filled in the 2 t tank, and the high refractive index layer forming ink 1 is filled in the 3 t tank. .
Furthermore, the low refractive index layer forming ink 1 is filled into a 4 t tank, the high refractive index layer forming ink 1 is filled into a 5 t tank, and the low refractive index layer forming ink 1 is filled into a 6 t tank. A 7-t tank was filled with the refractive index layer forming ink 1. (Attached equipment such as 4t, 5t, 6t, 7t tanks and other pressurizing pumps are not shown.)

  When the ink in the tank is sent out sequentially from the pressure pump 1 to the pressure pump 7, the titanium compound of the adjacent high refractive index layer forming ink 1 and the polyvinyl alcohol of the low refractive index layer forming ink 1 come into contact with each other. Reaction cross-linking results in the formation of an insoluble reaction product and prevents further mixing of the liquid between the two liquid layers.

  As shown in 6 in FIG. 1, the 80 μm-thick triacetyl cellulose (ТAC) film is transported while being held in the cylinder 4 and dropped by gravity along the slope of the die coating unit. When the ink layer hindered from falling is dropped from the end of the die coating unit, it is scooped into the ТAC film 6 and rapidly cooled in the cooling zone 5. Thereafter, the film was dried in the drying zone 7 to obtain an infrared reflective film.

  In the infrared reflective film, the outermost layer needs to be a high refractive index layer. The structure of each layer of the laminate obtained in Example 1 is as follows: ТAC film / high refractive index layer / low refractive index layer / high refractive index layer / low refractive index layer / high refractive index layer / low refractive index layer / high refractive index It becomes a structure called a layer. The thickness of each layer must be close to the wavelength of infrared rays. By making the ink supply from each pressure pump almost equal and increasing the transport speed of ТAC film, a thin and uniform infrared reflection function is achieved. A high infrared reflective film could be produced.

  In Example 1, seven layers of water-based ink are applied simultaneously, mixing between the ink liquid layers is hindered by a crosslinking reaction, and the low refractive index layer is cooled to reduce the fluidity and then dried, thereby producing a high-performance infrared ray. It is a manufacturing method which manufactures a reflective film. According to this manufacturing method, a multi-layered high refractive index layer and low refractive index layer can be formed by one application, and the boundary is clear. Moreover, since it can apply | coat with a thin film, the infrared reflective film with a high visible light transmittance | permeability was able to be manufactured.

(Example 2, manufacturing method 2 of an infrared reflective film)
In Example 1 in which a multilayered structure is obtained by using a cross-linking reaction between a polymer having a hydroxyl group and a titanium chelate to prevent mixing between liquid layers, and in order to produce an infrared reflective film, the film is quenched and fluidized. Although the layer to be lowered is a low refractive index layer, the high refractive index layer can also reduce the fluidity in the production method of Example 2.
(Ink 2 composition for forming a high refractive index layer)
Components of the following composition were blended to prepare a high refractive index layer forming ink 2 composition.
Polyvinyl alcohol “manufactured by Kanto Chemical Co., Ltd., weight average molecular weight = about 100,000”: 8 parts by weight aqueous polyester resin “Vylonal® MD-1500”: 80 parts by weight “manufactured by Toyobo Co., Ltd., weight average molecular weight = about 20,000, solid concentration 30% by weight "
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 3 parts by weight titanium oxide dispersion “AERODISP® W740X”: 336 parts by weight “manufactured by Nippon Aerosil Co., Ltd., solid content 40% by weight”
Water: 90 parts by weight

  For the measurement of the refractive index, after coating the water-based ink for the high refractive index layer on the light-transmitting substrate, the coating film is formed by drying in an oven at 120 ° C. for 3 minutes. When the refractive index was measured using a refractometer “DVA-36L type” (light source: sodium D line, measurement wavelength: 589 nm, manufactured by Mizoji Optical Co., Ltd.), the refractive index was 1.54.

(Ink 2 composition for forming a low refractive index layer)
The ink 2 composition for low refractive index layer formation was prepared by mix | blending the component of the following composition.
Polyvinyl alcohol “manufactured by Kanto Chemical Co., Ltd., weight average molecular weight = about 100,000”: 8 parts by weight aqueous acrylic resin “Watersol (registered trademark) PW-1100”: 52 parts by weight “manufactured by DIC Corporation, weight average molecular weight = about 50,000, 45% solids water emulsion "
Silicon oxide dispersion “AERODISP (registered trademark) W1836”: 352 parts by weight “Nippon Aerosil Co., Ltd., solid content 34% by weight”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 3 parts by weight Water: 92 parts by weight

  For the measurement of the refractive index, after coating the water-based ink for the low refractive index layer on the light-transmitting substrate, it is dried in an oven at 120 ° C. for 3 minutes to form a coating film. When the refractive index was measured using a refractometer “DVA-36L type” (light source: sodium D line, measurement wavelength: 589 nm, manufactured by Mizoji Optical Co., Ltd.), the refractive index was 1.39.

(Ink 2 composition for mixing prevention)
Ingredients having the following composition were blended to prepare an ink 2 composition for preventing mixing.
Sodium polystyrene sulfonate: 1 part by weight “Tosoh Organic Chemical Co., Ltd., product number PS100”
Organotitanium compound “Orgatyx (registered trademark) ТC-400”: 3.0 parts by weight Water: 100 parts by weight

(Simultaneous multilayer coating)
The 1 t tank of FIG. 1 was filled with the low refractive index layer forming ink 2, the mixing prevention ink 2 was filled into the 2 t tank, and the high refractive index layer forming ink 2 was filled into the 3 t tank.
Furthermore, the mixing prevention ink 2 is filled into a 4 t tank, the low refractive index layer forming ink 2 is filled into a 5 t tank, the mixing preventing ink 2 is filled into a 6 t tank, and the high refractive index layer forming ink is filled. 2 was filled into a 7-ton tank. (Attached equipment such as 4t, 5t, 6t, 7t tanks and other pressurizing pumps are not shown.)

  When the ink in the tank is sent from the pressurizing pump 1 to the pressurizing pump 7 in order, the polyvinyl alcohol of the adjacent high refractive index layer forming ink 2 and the titanium compound of the mixing preventing ink 2 are brought into contact and crosslinked. Insoluble matter or hardly soluble matter is formed, and similarly, the polyvinyl alcohol of the adjacent low refractive index layer forming ink 2 and the titanium compound of the mixing preventing ink 2 are contacted and reactively cross-linked. And the mixing between the liquid layers of the high refractive index layer forming ink 2 and the low refractive index layer forming ink 2 is prevented.

  As shown in 6 in FIG. 1, the 80 μm-thick triacetyl cellulose (ТAC) film is transported while being held in the cylinder 4 and dropped by gravity along the slope of the die coating unit. When the ink layer hindered from falling is dropped from the end of the die coating unit, it is scooped into the ТAC film 6 and rapidly cooled in the cooling zone 5. Thereafter, the film was dried in the drying zone 7 to obtain an infrared reflective film.

  In the infrared reflective film, the outermost layer needs to be a high refractive index layer. The configuration of each layer of the laminate obtained in Example 2 is the configuration of ТAC film / low refractive index layer / high refractive index layer / low refractive index layer / high refractive index layer. The dry thickness of the low refractive index layer and the high refractive index layer must be close to the infrared wavelength, and the ink supply from each pressure pump should be approximately equal to increase the transport speed of ТAC film. Thus, a thin and uniform infrared reflecting film having a high infrared reflecting function could be produced. The mixing-preventing ink is essentially only a titanium compound, but since the viscosity is low with the titanium compound alone and the ink cannot be developed in a layered manner, sodium polystyrene sulfonate is added as a thickener. This anti-mixing ink has a small amount of extrusion and reacts with the low refractive index layer ink and the high refractive index layer ink respectively, so it is observed as an independent layer that is incorporated into the low refractive index layer and the high refractive index layer. Can not.

  In Example 2, seven layers of water-based ink are simultaneously applied, mixing between the ink liquid layers is prevented by a crosslinking reaction, and the low-refractive index liquid layer and the high-refractive index liquid layer are cooled and then dried after being cooled. By this, it is a manufacturing method which manufactures a high-performance infrared reflective film. According to this manufacturing method, a multi-layered high refractive index layer and low refractive index layer can be formed by one application, and the boundary is clear. Moreover, since it can apply | coat with a thin film, the infrared reflective film with a high visible light transmittance | permeability was able to be manufactured.

(Example 3, production method of antireflection film)
The antireflective film of an Example can be produced with the same manufacturing method using the refractive index adjustment component of the extender pigment similar to the above-mentioned infrared reflective film, and a binder. However, in the case of an antireflection film, the refractive index of the outermost layer is preferably lower than the refractive index of adjacent layers (that is, one inner layer), contrary to the case of an infrared reflection film. Further, in both the infrared reflection film and the antireflection film, the refractive index level is alternately repeated in the intermediate laminated layer, that is, the relative refractive index of each layer is “... / high refractive index layer / low refractive index”. The refractive index layer / the high refractive index layer / the low refractive index layer /.

  An antireflection film can be produced by changing the outermost layer in Example 2 to a low refractive index layer instead of the high refractive index layer.

(Simultaneous multilayer coating)
The high refractive index layer forming ink 2 of Example 2 is filled in the 1 t tank of FIG. 1, the anti-mixing ink 2 is filled in the 2 t tank, and the low refractive index layer forming ink 2 of Example 2 is 3 t. The other tank was not filled with ink, and an antireflection film was obtained in the same manner as in the production method of Example 2 below.
In the antireflection film, the outermost layer needs to be a low refractive index layer. The configuration of each layer of the laminate obtained in Example 3 is a configuration of ТAC film / high refractive index layer / low refractive index layer. The thickness of each layer needs to be close to the wavelength of visible light. By making the amount of ink supplied from each pressure pump almost equal and increasing the transport speed of ТAC film, it is a thin and uniform antireflection function. High antireflection film could be produced.

(Example 4, production method of sublimation transfer recording image receiving sheet)
The production method according to the present invention is characterized in that it can be used in a production method of a laminate comprising a thin film layer and a relatively thick layer. For example, an image receiving sheet used for sublimation transfer recording has a laminated structure in which the substrate / heat insulating layer / intermediate layer / image receiving layer are stacked on the substrate. The manufacturing method can be used even when the thickness of the heat insulating layer is different, such that a thickness of about 4 μm is necessary in the dry state, whereas a thickness of about 1 μm is sufficient for the image receiving layer.

  Usually, such a laminate is manufactured by applying each layer sequentially and drying it. However, when a new layer is printed on the dried layer, the ink is repelled by the lower layer, causing unevenness. Another problem is that the lower layer is dissolved by the upper ink and the pattern of the gravure plate is moved, and the coated surface becomes uneven.

  If this laminate is manufactured by the simultaneous multi-layer coating method, even if the outermost image-receiving layer becomes dry and viscous, the lower heat-insulating layer does not progress in drying, and its viscosity is low and it tends to flow. Problems arise. At this time, in the production method of the present invention, the thick lower layer is gelled with a gelling agent, thereby preventing a flow during drying and obtaining a uniform laminate of the layers.

Example 4 is an example of production of a sublimation transfer recording image paper. This method uses a salting-out reaction to prevent mixing of water-based ink and water-based ink.
An ink composition for forming a heat insulating layer was prepared by blending components having the following composition.
(Ink composition for forming a heat insulation layer)
Acrylic hollow particles “ROPEIKE (registered trademark) HP-1055”: 20 parts by weight “Rohm and Haas”
Polyvinyl alcohol “K-11”: 19 parts by weight “manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 1000, 15% solution”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 2.0 parts by weight Water: 40 parts by weight

(Ink 4 composition for preventing mixing)
Ingredients of the following composition were blended to prepare an ink 4 composition for preventing mixing.
Sodium polystyrene sulfonate: 1 part by weight “Tosoh Organic Chemical Co., Ltd., product number PS100”
Sodium chloride: 5 parts by weight Water: 100 parts by weight

(Composition of intermediate layer forming ink)
The ink composition for forming an intermediate layer was prepared by blending the components having the following composition.
Polyester urethane: 10 parts by weight “manufactured by DIC Corporation, product number AP-40”
Polyvinyl alcohol 15% solution “degree of saponification 88%”: 33 parts by weight “manufactured by Nippon Synthetic Chemical Industry Co., Ltd., product number GL-05”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 1.6 parts by weight Water: 30 parts by weight

(Image-receiving layer forming ink composition)
An ink composition for forming an image receiving layer was prepared by blending components having the following composition.
Ethylene-vinyl acetate-vinyl chloride copolymer emulsion: 15.0 parts by weight “Sumikaflex, trade name, manufactured by Sumika Chemtex Co., Ltd.”
Mold release component: polyether modified silicone: 1.5 parts by weight “KF-615A, trade name, manufactured by Shin-Etsu Chemical Co., Ltd., side chain modified type”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 1 part by weight surfactant “Surfinol 465, trade name, manufactured by Nissin Chemical Industry Co., Ltd.”: 0.12 parts by weight Water: 80 parts by weight

(Simultaneous multilayer coating)
The 1-ton tank of FIG. 1 is filled with the heat insulation layer forming ink, the mixing prevention ink 4 is filled into the 2 t tank, the intermediate layer forming ink is filled into the 3 t tank, and the mixing prevention ink 4 is filled with 4 t. Filled the tank. Further, an ink for forming an image receiving layer was filled in a 5 t tank. (The 4t and 5t tanks and the accompanying pressure pump are not shown.)

  As in Example 1, when the ink in the tank is sent from the pressure pump 1 to the pressure pump 5 in order, the contact surface between the adjacent heat insulation layer forming ink and the mixing preventing ink 4 is used for heat insulation layer formation. Polyvinyl alcohol in the ink precipitates in contact with the sodium chloride solution of the mixing preventing ink 4. Some gelatin also precipitates. A similar precipitation reaction occurs on the contact surface between the mixing preventing ink 4 and the intermediate layer forming ink, and the mixing of the heat insulating layer forming ink liquid layer and the intermediate layer forming ink liquid layer is hindered. The same precipitation reaction occurs at the contact surface between the intermediate layer forming ink and the mixing prevention ink 4 and mixing of the image receiving layer forming ink liquid layer and the intermediate layer forming ink liquid layer above the mixing preventing layer ink 4 is performed. Is disturbed.

  The reason for using the mixing preventing ink 4 is that polyvinyl alcohol is contained in the heat insulating layer ink and the intermediate layer ink. If the same reaction component is contained in the adjacent ink layer, the component that reacts with it cannot be put in either. In this case, a component that reacts with a component in the ink is used as another ink as a mixing preventing ink. When the reaction component in the mixing prevention ink is a low molecular weight, a liquid layer cannot be formed well only by the low molecular weight.

  As shown in 6 of FIG. 1, the primer-treated coated paper having a thickness of 100 μm is transported while being held in the cylinder 4 and dropped by gravity along the slope of the die coating unit. When the ink layer falls from the end of the die coating unit, it is scooped onto the coated paper 6 and immediately cooled in the cooling zone 5 to gelatinize the gelatin in each ink layer to reduce the fluidity of the ink. The layer was dried in the drying zone 7 while maintaining the laminated structure.

  When the production method of the present invention is not used, the laminated structure between the ink layers cannot be maintained unless the amount of gelatin in each ink layer is 2 to 10 times that of this embodiment. In Example 4, even if the amount of gelatin is reduced, the mixing of the ink between the ink layers is hindered by the insoluble or hardly soluble material generated by the salting-out reaction, so that the ink fluidity is lowered. The addition of gelling components for this purpose can be made small. In Example 4, the heat-insulating layer, the intermediate layer, and the image-receiving layer were produced by adjusting the extrusion amount of each ink and the coated paper conveyance speed so that the thicknesses when dried were 4 μm, 2 μm, and 1 μm, respectively. .

  The production example of Example 4 uses a salting-out reaction (a salting-out reaction that removes hydrated water from a polymer that is hydrated and dissolved) at the interface between the water-based ink and the water-based ink. By preventing the mixing of the layers, and simultaneously coating water-based ink / mixing-preventing ink / water-based ink / mixing-preventing ink / water-based ink, then reducing the fluidity of the ink liquid layer and drying in that state This is a method for producing image-receiving paper for heat-sensitive sublimation transfer.

(Example 5, manufacturing method 1 of heat dissipation film)
This is a method of manufacturing a heat dissipation film having high thermal conductivity in the direction perpendicular to the film surface by coating the film with a heat conductive material. The reaction is a simultaneous multi-layer coating that utilizes complex formation of a metal ion with a polymer having a chelating ligand.
(Electrically insulating-thermally conductive ink 1 composition)
Components of the following composition were blended to prepare an electrically insulating-thermally conductive ink composition 1.
Polyvinyl alcohol “Kuraray Co., Ltd., product number KL118”: 1.5 parts by weight gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 2 parts by weight vinyl acetate emulsion “Vinizole (registered trademark) 900”: 18 parts by weight “Daido Kasei Kogyo Co., Ltd., solid concentration 50% "
Boron nitride “Grade PТX15”: 120 parts by weight “MOME ТIVE, spherical boron nitride, particle size 15 μm”
Water: 60 parts by weight

(Electrically insulating-thermally conductive ink 2 composition)
Components of the following composition were blended to prepare an electrically insulating-thermally conductive ink 2 composition.
Vinyl acetate emulsion “Vinizole (registered trademark) 900”: 24 parts by weight “Daido Kasei Kogyo Co., Ltd., solid content 50%”
Boron nitride “Grade PТX15”: 120 parts by weight “MOME ТIVE, spherical boron nitride, particle size 15 μm”
Aluminum sulfate: 2.5 parts by weight Water: 60 parts by weight

(Simultaneous multilayer coating)
1t tank of FIG. 1 is filled with the electrical insulating-thermal conductive ink 1, the electrical insulating-thermal conductive ink 2 is filled into the 2t tank, and the electrical insulating-thermal conductive ink 1 is filled with the 3t tank. Filled.
Further, the electrically insulating-thermally conductive ink 2 was filled in a 4 t tank, and the electrically insulating-thermally conductive ink 1 was filled in a 5 t tank. (Attached equipment such as 4t and 5t tanks and other pressurizing pumps are not shown.)

  As in Example 1, when the ink in the tank is sent from the pressure pump 1 to the pressure pump 5 in order, the polyvinyl alcohol in the electrically insulating-thermally conductive ink 1 becomes electrically insulating-thermally conductive ink. 2 is a special polyvinyl alcohol having a high chelate reactivity with aluminum sulfate in 2 so that when it comes into contact with the ink layer of the electrically insulating-thermally conductive ink 2, the insoluble matter or the hardly soluble matter is converted into two inks. Produced on the contact surface of the liquid layer, mixing between the two liquid layers is prevented.

  As shown in 6 of FIG. 1, an ink that has fallen by gravity along the slope of the die coating unit while being transported by holding a polyethylene terephthalate film having a thickness of 100 μm as shown in 6 of FIG. The layer is scooped into the polyethylene terephthalate film 6 when falling from the end of the die coating unit, cooled in the cooling zone 5 and dried in a state where the fluidity of the liquid layer of the electrically insulating-thermal conductive ink 1 is lowered. An insulating heat dissipation sheet in which five layers of boron nitride particles are dispersed is produced by drying in zone 7. The thickness of the electrically insulating-thermally conductive ink 1 is adjusted to be 70 μm in the dry state, and the thickness of the electrically insulating-thermally conductive ink 2 is 20 μm in the dried state. By adjusting the conveyance speed of the polyethylene terephthalate film, the thickness of the entire coating film during drying was 250 μm.

  In Example 5, it is possible to obtain a heat radiating sheet having excellent thermal conductivity in the vertical direction in which boron nitride particles having excellent thermal conductivity are arranged in the vertical direction from the film surface. When a sheet with this thickness is coated once, boron nitride particles are deposited near the film surface, and the upper ink layer has only a binder, and good thermal conductivity in the vertical direction. Can't get. In this manufacturing method, since the boron nitride particles are held in each liquid layer and do not settle to the film surface, it is possible to obtain a heat radiating sheet having good thermal conductivity in the vertical direction.

(Example 6, manufacturing method 2 of heat dissipation film)
This is a method for producing a heat dissipation film having high thermal conductivity in the direction perpendicular to the film surface by coating the film. The reaction is a method for producing simultaneous multi-layer coating using a neutralization reaction between a polymer having an acidic group and a polymer having a base.

(Electrically insulating-thermally conductive ink 3 composition)
Electrically insulating and thermally conductive ink composition 3 was prepared by blending components having the following composition.
Polyvinyl alcohol “Product No. C506”: 1.5 parts by weight “Kuraray Co., Ltd., cation-modified polyvinyl alcohol”
Gelatin “GBL-200 manufactured by Nitta Gelatin Co., Ltd.”: 1.5 parts by weight Vinyl acetate emulsion “Vinizole (registered trademark) 900”: 18 parts by weight “Daido Kasei Kogyo Co., Ltd., solid content concentration 50%”
Boron nitride “Grade PТX15”: 120 parts by weight “Momen ТIVE, spherical boron nitride, particle size 15 μm)
Water: 60 parts by weight

(Ink for preventing mixing 6 composition)
Ingredients having the following composition were blended to prepare an ink 6 composition for preventing mixing.
Acrylamide / sodium acrylate copolymer: 1.0 part by weight “Taipolymer (registered trademark) TA-350, manufactured by Daimei Chemical Co., Ltd.”
Water: 100 parts by weight

(Electrically insulating-thermally conductive ink 4 composition)
Components of the following composition were blended to prepare an electrically insulating-thermally conductive ink 4 composition.
Vinyl acetate emulsion “Vinizole (registered trademark) 900”: 24 parts by weight “Daido Kasei Kogyo Co., Ltd., 50%”
Boron nitride “Grade PТX15”: 120 parts by weight “MOME ТIVE, spherical boron nitride, particle size 15 μm”
Water: 60 parts by weight

(Simultaneous multilayer coating)
The 1-ton tank of FIG. 1 was filled with the electrically insulating-thermally conductive ink 4, the anti-mixing ink 6 was filled into the 2-ton tank, and the electrically-insulating-thermally conductive ink 3 was filled into the 3-ton tank.
Further, the mixing prevention ink 6 was filled in a 4 t tank, and the electrically insulating and heat conductive ink 4 was filled in a 5 t tank. The 6t tank was filled with the mixing preventing ink 6, and the 7t tank was filled with the electrically insulating-thermal conductive ink 3. (4t, 5t, 6t, 7t tanks and other equipment such as a pressurizing pump are not shown.)

  Similarly to Example 1, when the ink in the tank is sent from the pressurization pump 1 to the pressurization pump 7 in order, the cation-modified polyvinyl alcohol in the electrically insulating-thermally conductive ink 3 becomes the mixture preventing ink 6. When the ink liquid layer of the electrically insulating-thermal conductive ink 3 and the liquid layer of the mixing preventing ink 6 are brought into contact with each other by neutralization reaction with the acrylamide / sodium acrylate copolymer, Produced on the contact surface of the two ink liquid layers, mixing between the two liquid layers is prevented. Although a part of the vinyl acetate emulsion of the electrically insulating-thermally conductive ink 3 and the electrically insulating-thermally conductive ink 4 may be insolubilized or hardly soluble when the mixing preventing ink 6 comes into contact, the aggregation speed Is relatively loose.

  As shown in 6 of FIG. 1, an ink that has fallen by gravity along the slope of the die coating unit while being transported by holding a polyethylene terephthalate film having a thickness of 100 μm as shown in 6 of FIG. The layer is scooped into the polyethylene terephthalate film 6 when falling from the end of the die coating unit, cooled in the cooling zone 5 and dried in a state where the fluidity of the liquid layer of the electrically insulating-thermal conductive ink 1 is lowered. An insulating heat radiation sheet in which the four layers of boron nitride particles are dispersed is produced by drying in the zone 7. The thickness of the electrically insulating-thermally conductive ink 3 is adjusted to 80 μm in the dry state, and the thickness of the electrically insulating-thermally conductive ink 4 is 20 μm in the dried state. The conveyance speed of the polyethylene terephthalate film was adjusted so that the thickness of all coating films during drying was 200 μm.

  In Example 6, it is possible to obtain a heat radiating sheet having excellent thermal conductivity in the vertical direction in which boron nitride particles having excellent thermal conductivity are arranged in the vertical direction from the film surface. When a sheet with this thickness is coated once, boron nitride particles are deposited near the film surface, and the upper ink layer has only a binder, so that thermal conductivity in the vertical direction is obtained. I can't. In this manufacturing method, since the boron nitride particles are held in each liquid layer and do not settle to the film surface, it is possible to obtain a heat radiating sheet having good thermal conductivity in the vertical direction.

(Quantitative elemental analysis near the layer boundary by glow discharge optical emission spectrometry)
About the Example of this invention, the element quantitative analysis of the depth direction by the glow discharge emission spectrometry was performed on condition of the following.
Measuring device: “GDS-Profiler2” (manufactured by Horiba, Ltd.)
RF power output: 20W
Argon gas pressure: 800 Pa
Anode diameter: 4mm
Use of pulse power supply (frequency: 25 Hz, duty ratio: 0.1)
Metering method: Synchro (pulse synchronization)
(Measurement example)
In the vicinity of the layer boundary of the laminate of Example 1, it was confirmed by glow discharge emission spectroscopy that a peak value was shown in a region where the titanium element concentration was narrow.

  The production method of the present invention is a production method capable of simultaneous multi-layer coating of water-based ink using an organic synthetic polymer compound, and is used for production of various industrial products to reduce product cost and improve performance. Can contribute widely.

1t: ink tank 2t: ink tank 3t: ink tank 1p: pressure pump 2p: pressure pump 3p: pressure pump 1: slit 2: slit 3: slit 1s: ink liquid layer 2s: ink liquid layer 3s: ink liquid Layer 4: Coating roll 5: Cooling zone 6: Substrate 7: Drying zone 11: Die coating unit

Claims (4)

  A method for producing a laminate, wherein a plurality of water-based inks containing an organic synthetic polymer compound are simultaneously extruded to stack a plurality of ink liquid layers, and when the ink liquid layers are stacked, between adjacent ink liquid layers Insoluble or insoluble matter is formed and mixing between the ink liquid layers is hindered. After that, after applying to the substrate while maintaining the laminated structure of the stacked ink liquid layers, the ink liquid layer is cooled to After reducing the fluidity of the ink liquid layer or the entire ink liquid layer, the ink liquid layer is dried and fixed, so that the components in the ink containing the organic synthetic polymer compound are layered on the substrate. A method for manufacturing a laminate.   The method for producing a laminate according to claim 1, wherein the hardly soluble substance or the insoluble substance is produced by any one of a crosslinking reaction, a complex formation reaction, a salting out reaction, and a neutralization reaction.   The method for producing a laminate according to claim 1 or 2, wherein at least one water-based ink among the plurality of water-based inks contains any one of gelatin, agar, carrageenan, xanthan gum, gum arabic, and guar gum.   The method for producing a laminate according to any one of claims 1 to 3, wherein the laminate is any one of an infrared reflective film, a sublimation transfer recording image receiving sheet, an antireflection film, and a heat dissipation sheet.

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