JP4354092B2 - Method for producing glossy paper for recording liquid ink - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid ink recording medium for printing ink jet ink by an ink jet printer, for example, and particularly to a method for producing glossy paper for liquid ink recording having gloss.
[0002]
[Prior art]
The ink jet recording method is a method in which minute droplets of ink are ejected from a minute nozzle and fixed on a recording sheet such as paper to record images, characters, etc., but there are many operating principles. This inkjet recording system has features such as high speed, low noise, easy multi-coloring, large recording pattern flexibility, no need for development and fixing, etc. It is used in various applications.
[0003]
[Problems to be solved by the invention]
The recording medium used in this ink jet recording method has a high density of printed dots, fast absorption of ink jet ink, and ink flows out or bleeds even when dots are overlapped when printed. It is desired that the dots do not spread more than necessary and are not blurred when printed. Therefore, as the ink jet recording sheet, high-quality paper devised so as to be rich in ink absorbability, coated paper having an ink receiving layer containing a porous pigment on the surface, and the like are applied.
[0004]
However, an ink receiving layer having a high porosity or a large void is rich in ink receptivity, but light scatters into the void due to light scattering on the surface of the layer or a decrease in light transmittance. It is difficult to reach, and the image becomes whitish, and the vividness of hue and the color density tend to decrease. Further, since such an ink receiving layer has a porous surface, it is difficult to desire high gloss.
[0005]
On the other hand, since a recording medium having a higher surface gloss than conventional ones is preferred by consumers, an inkjet recording medium having a gloss finish has been proposed. Is desired. As a method for imparting gloss to the surface of a paper as an ink jet recording medium, a method of smoothing the coating layer surface and increasing the gloss by passing paper between pressurized and heated rolls is known. When the pigment-coated paper is calendered at high temperature and pressure, the gloss is improved, but the voids in the coating layer are reduced, the ink absorption is delayed and drying is delayed, and the ink is overflowed due to the decrease in the absorption capacity, so-called beading. This is not preferable for inkjet recording sheets.
[0006]
Therefore, it has been considered that a glossy layer is formed by applying a highly glossy coating composition on the intermediate layer. However, providing a glossy layer having high glossiness on the intermediate layer that absorbs ink jet ink quickly has the disadvantage that the glossy layer material is easily absorbed by the intermediate layer, making gloss less likely to occur.
[0007]
Therefore, a main object of the present invention is to provide a method for producing glossy paper for liquid ink recording, which absorbs and fixes liquid ink such as inkjet ink quickly and has high gloss.
[0008]
[Means for Solving the Problems]
The present invention includes a step of preparing a base material, a step of forming an intermediate layer constituting an ink receiving layer that receives liquid ink on one main surface thereof, and a plurality of surfaces on the surface of the intermediate layer opposite to the base material A method for producing a glossy paper for liquid ink recording, comprising the steps of: forming a glossy layer formed so that liquid ink penetrates into the intermediate layer from the micropores. The gelling agent in any one of the combinations (1) to ( 2 ) is contained, and the glossy layer is allowed to contain a gelling agent that reacts with the gelling agent contained in the intermediate layer. The liquid composition prevents the coating composition for forming the glossy layer from penetrating into the intermediate layer by reacting the gelling agent contained in the glossy layer with the gelling agent contained in the intermediate layer to cause gelation. In the manufacturing method of glossy paper for ink recording That.
Combination of gelling agent and gelling agent that reacts with the gelling agent:
(1) copper sulfate and casein (2) calcium, barium, aluminum, metal salts and alginic acid copper or iron [0009]
In the step of forming the glossy layer of the present invention, a glossy layer-forming coating composition is applied on the intermediate layer, the smooth surface of the film having a smooth surface is adhered onto the coating composition, and the glossy layer is formed. After forming, the film may be peeled from the glossy layer.
[0010]
In the step of forming the glossy layer of the present invention, a glossy layer-forming coating composition is applied to the smooth surface of the film having a smooth surface, and the coating composition is laminated on the intermediate layer. After forming the film, the film may be peeled off from the glossy layer.
[0011]
In the present invention, the intermediate layer may include a pigment that absorbs an ink fixing agent, an ink dye, and the like, and may be formed so that liquid ink is adsorbed by the pigment.
[0012]
According to the present invention, a gelled thin film is formed between the intermediate layer and the glossy layer by reacting the gelling agent with the gelling agent and gelling, and the coating composition for forming the glossy layer is intermediate. Infiltration into the layer is prevented. Therefore, a glossy layer having a desired glossiness can be formed on the intermediate layer, and when the glossy layer is formed, the coating composition penetrates into the intermediate layer and fills the voids in the intermediate layer to increase the ink absorption tolerance. There is no reduction. As a result, the two requirements of high ink receiving speed and high glossiness can be achieved simultaneously.
[0013]
The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the present invention with reference to the drawings.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic cross-sectional view of a liquid ink recording glossy paper according to an embodiment of the present invention. The liquid ink recording glossy paper 10 is an ink receiving medium serving as an intermediate layer for receiving an oil-based or water-based inkjet ink on one main surface (surface) of a base material 12 which is a support material made of high-quality paper or a synthetic resin film / sheet. The layer 14 is formed, and a gelling agent layer is formed on the main surface (surface) opposite to the main surface 12 side main surface of the ink receiving layer 14 (reference example). A gloss layer 16 located on the outermost surface is formed on the main surface (surface) opposite to the main surface on the layer 14 side. In this case, a gelling agent is mixed in the coating material 16 a for forming the gloss layer 16. Note that a gelling agent layer may be provided instead of the gelling agent layer (reference example). In that case, the gelling agent is mixed into the coating material 16a. Further, the coating composition 14 ′ for forming the ink receiving layer 14 without forming a gelling agent layer or gelling agent layer contains a gelling agent (or gelling agent (reference example)). The coating composition 16a for forming the gloss layer 16 may contain a gelling agent (or gelling agent (reference example)). Here, the gelling agent gels the gelled agent. The gelling agent and the gelling agent cooperate to form a gelled thin film layer 20 between the glossy layer 16 and the ink receiving layer 14.
Examples of combinations of gelling agent and gelling agent used in this embodiment include combinations of boric acid and borax, etc. and polyvinyl alcohol (PVA) (reference example), copper sulfate and formic acid (reference example) and Casein combinations, combinations of metal salts such as calcium, barium, aluminum, copper, and iron with alginic acid, electrolytes such as monovalent or polyvalent metal ions (eg, magnesium sulfate, copper sulfate, aluminum sulfate, etc.) and colloidal silica (Reference example) can be used.
Further, examples of the gelling agent that can be used include boron compounds that rapidly cause a crosslinking reaction when used in combination with polyvinyl alcohol. Boron compounds include boric acid, borates (eg, orthoborate, InBO ₃ , ScBO ₃ , YBO ₃ , LaBO ₃ , Mg ₃ (BO ₃ ) ₂ , Co ₃ (BO ₃ ) ₂ ), diborate (eg, Mg ₂ B ₂ O ₅ , Co ₂ B ₂ O ₅ ), metaborate (eg, LiBO ₂ , Ca (BO ₂ ) ₂ , NaBO ₂ , KBO ₂ ), tetraborate (eg, Na ₂ B ₄ O) ₇ · _10H 2 O), it can be given five borate _{(e.g., KB 5 O 8 · 4H 2} O, Ca 2 B 6 O 11 · 7H 2 O, a _CsB 5 _{O 5)} etc. (reference example).
Other gelling agents include glyoxal, melamine / formaldehyde (eg, methylol melamine, alkylated methylol melamine), methylol urea, resol resin, polyisocyanate, and the like. The gelling agent layer or the gelling agent layer is prepared by dissolving the gelling agent or the gelling agent in water and / or an organic solvent. The concentration of this solution is preferably 0.05 to 10% by weight, particularly 0.1 to 7% by weight. Examples of the organic solvent used alone or mixed with water include alcohols such as methanol and isopropyl alcohol; ketones such as methyl ethyl ketone; esters such as ethyl acetate; aromatic solvents such as toluene; ethers such as tetrahydrofuran; And halogenated solvents such as The coating amount of the gelling agent liquid is preferably about ² to 40 g / m2.
[0015]
The ink receiving layer 14 is provided at least in one layer between the base material 12 and the gloss layer 16 as a support material. The coating composition 14 'for forming the ink receiving layer 14 is formed by mixing an inorganic pigment and / or an organic pigment with an ink fixing agent, a binder, other pigment dispersants, a water resistance agent and the like.
[0016]
Examples of the filler constituting the coating composition 14 'include pigments such as silica, colloidal silica, calcium carbonate, and aluminum oxide. More specifically, the pigment includes inorganic fine particles. Examples of the inorganic fine particles include silica fine particles, colloidal silica, calcium silicate, zeolite, kaolinite, halloysite, muscovite, talc, calcium carbonate, calcium sulfate, boehmite. And pseudo boehmite. From the viewpoint of not reducing transparency, those having a refractive index in the range of 1.40 to 1.60 are preferred, and silica fine particles are particularly preferred. The average primary particle size of the inorganic fine particles is generally 30 nm or less, preferably 15 nm or less, particularly preferably about 3 to 10 nm, from the viewpoint of transparency. The refractive index is preferably around 1.45. Silica fine particles are easy to adhere to each other due to hydrogen bonding due to silanol groups on the surface. Furthermore, when the average primary particle diameter is 10 nm or less, it is possible to form a structure with a particularly high porosity, thereby improving ink absorption characteristics. It is effective for. Silica fine particles that can be used are roughly classified into a wet method and a dry method depending on the production method. In the wet method, a method in which activated silica is produced by acid decomposition of silicate, and this is appropriately polymerized and coagulated and precipitated to obtain hydrous silica is the mainstream. On the other hand, dry silica is a method by high-temperature gas phase hydrolysis of silicon halide (flame hydrolysis method), a method in which silica sand and coke are heated and reduced by arc in an electric furnace and oxidized with air ( The method of obtaining anhydrous silica by the arc method) is the mainstream. These hydrous silica and anhydrous silica differ in the density of silanol groups on the surface, the presence or absence of vacancies, etc., and show different properties, but in the case of anhydrous silicic acid (anhydrous silica), the porosity is particularly high in three dimensions. It is known to form a structure and is preferred for use in the present invention. In silica fine particles, from the viewpoint of transparency of the porous layer, the type of resin combined with the silica fine particles is important. In the case of anhydrous silica, it is preferable to use polyvinyl alcohol (PVA) as a water-soluble resin, In particular, polyvinyl alcohol having a low saponification degree, specifically, a saponification degree of 70 to 90% is preferable in terms of light transmittance. PVA has a hydroxyl group in the structural unit, and this hydroxyl group and a silanol group on the surface of the silica fine particle form a hydrogen bond, thereby making it easy to form a three-dimensional network structure in which the secondary particle of the silica fine particle is a chain unit. Thus, it is considered that a colorant receiving layer having a structure with a high porosity can be obtained. A porous layer having a three-dimensional network structure absorbs ink rapidly by capillary action in ink jet recording, and not only enables fine recording without ink bleeding or ink accumulation, but also a color material in thermal recording, In addition, the toner in electrophotographic recording can be firmly adhered. That is, the coloring material or toner penetrates into the pores of the porous layer, the shape anchor effect due to the three-dimensional network structure is generated, and the coloring material or the like is firmly fixed. Moreover, since there are many ratios of the inorganic fine particle which comprises a transparent layer, it has the characteristics that heat resistance is high and embossing resistance is also high.
[0017]
Examples of the ink fixing agent (cationizing agent) constituting the coating composition 14 'include quaternary ammonium salt polymers, polyamines and derivatives thereof, alkylamine polymers, dicyandiamide type cationic resins, and the like. In particular, from secondary amines, tertiary amines, and quaternary ammonium salts that form insoluble salts with sulfonic acid groups, carboxyl groups, amino groups, and the like in water-soluble direct dyes and water-soluble acidic dyes that are dye components of water-based inks. When the cationic ink fixing agent is added, the dye is captured in the ink receiving layer 14. Therefore, when the color is improved and an insoluble salt is formed, the ink can be prevented from flowing out or bleeding when water is dripped or absorbed.
[0018]
Examples of the binder constituting the coating composition 14 'include PVA such as silicon-modified polyvinyl alcohol, starch, SBR latex, acrylic resin, and urethane resin. More specifically, examples of the binder include starch derivatives such as oxidized starch, etherified starch, and phosphate esterified starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein, gelatin, soy protein, polyvinyl alcohol or the like Derivatives: Polyvinyl alcohol of various degrees of oxidation or its silanol-modified products, carboxylated products, cationized products, etc .; conjugated dienes such as polyvinylpyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer Copolymer latex; acrylic polymer latex such as acrylate and methacrylate polymer or copolymer; vinyl polymer latex such as ethylene vinyl acetate copolymer; Or functional group-modified polymer latex with functional group-containing monomers such as carboxy groups of these various polymers; aqueous adhesives such as thermosetting synthetic resins such as melamine resins and urea resins; acrylics such as polymethyl methacrylate; Examples include acid esters; methacrylic acid ester polymers or copolymer resins; polyurethane resins, unsaturated polyester resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral, alkyd resins, and the like. When the gelling agent or the gelling agent is contained in the binder, a material that does not gel by reacting with the gelling agent or the gelling agent is selected from these.
[0019]
In addition, the coating composition 14 ′ for forming the ink receiving layer 14 may contain a water-proofing agent such as a melamine resin, if necessary. Further, the coating composition 14 'may be blended with other materials for various purposes. For example, pigment dispersants, thickeners, fluidity improvers, antifoaming agents, antifoaming agents, release agents, foaming agents, penetrating agents, coloring dyes, colored pigments, fluorescent whitening agents, UV absorbers, antioxidant Various additives such as agents, preservatives, antibacterial agents, wet paper strength enhancers, and dry paper strength enhancers can be appropriately blended depending on the purpose.
[0020]
The blending ratio of the pigment and the binder in the coating composition 14 'for forming the ink receiving layer 14 is 3 to 70 parts by weight, more preferably 5 to 50 parts by weight with respect to 100 parts by weight of the pigment. However, when the blending ratio of the binder with respect to 100 parts by weight of the pigment is less than 3 parts by weight, the coating strength of the ink receiving layer 14 may be insufficient. On the other hand, when the blending ratio of the binder exceeds 70 parts by weight, the ink absorbability of the ink receiving layer 14 may be lowered.
[0021]
Here, an example of the blending ratio of the pigment and the binder in the coating composition 14 ′ for forming the ink receiving layer 14 is as follows. For example, solid or powdery amorphous silica (silicon dioxide SiO ₂ ) which is a porous material as a pigment is 100 parts by weight, polyvinyl alcohol is 45 parts by weight as a binder, and an ink fixing agent. 30 parts by weight of a liquid polyamine derivative, 10 parts by weight of acetal (formal) as a water-resistant agent, and 1 part by weight of powdered hexametaphosphoric acid as a dispersant are mixed. Thus, the ink receiving layer 14 can be formed.
[0022]
The coating amount of the coating composition 14 ′ for forming the ink receiving layer 14 varies depending on the required gloss, ink absorbability, type of support, etc., but cannot be generally stated, but is usually 1 g / m ^2. As mentioned above, Preferably, it is 5-15 g / m < ² >. Further, the ink receiving layer 14 may be applied by dividing a certain coating amount into two or more times.
[0023]
The coating composition 14 ′ for forming the ink receiving layer 14 can be applied using various coating apparatuses on-machine or off-machine. Examples of the coating apparatus include various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters, and size presses. Further, in order to make the ink receiving layer 14 smooth, after the ink receiving layer is coated, a flattening finish may be performed using a calendar device such as a machine calendar, a TG calendar, and a soft calendar. In addition, the number of layers of the ink receiving layer 14 can be appropriately determined as necessary, and may be one layer or a plurality of layers.
[0024]
Next, the gloss layer 16 will be described. The gloss layer 16 is made of a coating composition 16a having transparency and made of a colloidal silica composite emulsion or the like. At least one gloss layer 16 is provided on the substrate 12 and the ink receiving layer 14 as a support. As the colloidal silica composite emulsion, colloidal silica / acrylic / styrene, colloidal silica / acrylic, or the like can be selected. The coating composition 16a for forming the glossy layer 16 may be one having a colloidal silica composite emulsion as a main component or one having a mixture of a filler and a binder as a main component. As the filler in this case, the same pigment as the ink adsorbing pigment used in the ink receiving layer 14 described above can be used, but colloidal silica is preferred. Moreover, as a binder, the thing similar to the above-mentioned ink receiving layer 14 can be used, However, A water-soluble resin is preferable. Examples of the water-soluble resin include resins having a hydrophilic structural unit or a dissociable group such as a carboxyl group. For example, polyvinyl alcohol (PVA), which is a resin having a hydroxyl group as a hydrophilic structural unit, a cellulose resin. (Methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC), etc.), chitins, and starch; polyethylene oxide (PEO), polypropylene oxide (PPO), which is a resin having an ether bond, Mention may be made of polyethylene glycol (PEG) and polyvinyl ether (PVE); and polyacrylamide (PAAM) and polyvinylpyrrolidone (PVP) which are resins having amide groups or amide bonds. Polyacrylic acid salt having a carboxyl group as a dissociable group, maleic acid resin, alginic acid salt and gelatins; polystyrene sulfonic acid salt having sulfone group, amino group, imino group, tertiary amine and quaternary ammonium salt Examples thereof include polyallylamine (PAA), polyethyleneimine (PEI), epoxidized polyamide (EPAm), polyvinylpyridine, and gelatins. When the gelling agent or the gelling agent is contained in the binder, a material that does not gel by reacting with the gelling agent or the gelling agent is selected from these. Specifically, for example, 0.001 to 100 parts by weight may be mixed with 100 parts by weight of colloidal silica as a filler. However, when the water-soluble resin is 0.001 or less, the coating strength of the glossy layer is difficult to be obtained and the coating property is also poor. When the amount is 100 parts by weight or more, micropores are hardly formed in the glossy layer, and the ink does not pass through the glossy layer 16 and reach the ink receiving layer 14. Further, in order to appropriately impart water resistance to polyvinyl alcohol or the like, for example, a water-resistant agent of urea glyoxal / acrylamide polymer may be mixed, or a curing agent may be mixed.
[0025]
In this glossy paper 10, the glossy layer 16 is formed so that the surface of the glossy layer 16 is smooth, and thereby the glossy paper 10 for recording liquid ink having a beautiful glossiness. In order to produce such a glossy paper 10 for recording liquid ink, as shown in FIG. 2, a coating composition 16a for forming the gloss layer 16 is first applied on the gelling agent layer, and then, The smooth surface of the film 18 is brought into close contact. Examples of the film 18 having a smooth surface include a polyethylene film, a polypropylene film, a polyamide (nylon) film, a polyester film, a polyethylene naphthalate film, a polystyrene film, a polvinyl alcohol (vinylon) film, a polyether ketone film, a polysulfone film, Polyethersulfone film, polyetherimide film, ethylene copolymer film such as EVA copolymer film and ionomer film, polycarbonate film, cellophane film, polyvinyl chloride film, polyvinylidene chloride film, aluminum foil, acetate film, etc. A film, a single film having a smooth surface other than this, or a paper and a film on which these films are bonded. Lum and the like can be used. In order to improve the releasability with the gloss layer 16, a release agent may be applied to the smooth surface.
[0026]
After the smooth surface of the film 18 is adhered to the applied coating composition 16a, the coating composition 16a is formed into a dry film to form the gloss layer 16, and then the film 18 is peeled off. In FIG. 2, the material 16a of the glossy layer indicated by hatching indicates that it is in an undried state. After the smooth surface of the film 18 is adhered, the surface of the peeled gloss layer 16 becomes smooth, and a beautiful glossy paper 10 can be obtained. Therefore, in the manufacturing process of the glossy paper 10, it is possible to simplify the manufacturing of the glossy paper without requiring an ultraviolet irradiation device or the like. In addition, the application | coating process of coating composition 16a can use the thing similar to what was illustrated as a coating apparatus of coating composition 14 '.
[0027]
As another method, in order to form the gloss layer 16, the gloss layer material 16a may be first applied to the smooth surface of the film 18, as shown in FIG. In this case, before the gloss layer material 16a is dried, the gloss layer coating composition 16a is pressure-bonded to the surface of the gelling agent layer. Then, after the gloss layer material 16 a is dried to form the gloss layer 16, the film 18 is peeled from the gloss layer 16. In this way, the gloss layer material 16a may be applied to the substrate 12 side or may be applied to the film 18 side, and after the gloss layer 16 is formed, the film 18 is peeled off. A glossy paper 10 having gloss can be obtained.
[0028]
The glossy layer 16 of the glossy paper 10 is formed as a porous film or layer having a plurality of fine pores. Liquid ink such as inkjet ink supplied from an inkjet printer or the like soaks into the ink receiving layer 14 from the glossy layer 16 through fine holes and is fixed.
[0029]
Next, the liquid ink applied to the glossy paper 10 for ink jet recording of this embodiment will be described. This liquid ink is a water-based ink, and the water-based ink is a recording liquid comprising a colorant, a liquid medium, and other additives. As the colorant, a water-soluble dye such as a direct dye, an acid dye, a basic dye, a reactive dye, or a food coloring matter is used.
[0030]
Although it does not specifically limit as a direct dye, For example,
C. I. Direct Black
48, 49, 51, 56, 62, 71, 74, 75, 77, 78, 80
C. I. Direct Yellow
42, 44, 48, 50, 51, 58, 72, 85, 86, 87, 88, 98
C. I. Direct Orange
77, 80, 81, 83, 84, 85, 90, 94, 99, 101, 108
C. I. Direct Red
75, 77, 80, 81, 83, 84, 85, 90, 94, 99, 101
C. I. Direct Blue
120, 123, 158, 163, 165, 192, 193, 194, 195
C. I. Direct Green
1, 6, 8, 28, 33, 37, 63, 64
C. I. Direct Brown
2, 6, 25, 27, 44, 58, 95, 100, 106, 112, 173
Etc. are used.
[0031]
Although it does not specifically limit as an acid dye, For example,
C. I. Acid Black
60, 94, 107, 109, 112, 118, 119, 121, 122
C. I. Acid Orange
7, 8, 10, 33, 56, 64
C. I. Acid Red
85, 87, 88, 89, 92, 94, 97, 106, 108, 110
C. I. Acid Violet
7, 11, 15, 34, 35, 41, 43, 49, 75
C. I. Acid Blue
93, 102, 104, 111, 113, 117, 120, 124, 126
C. I. Acid Green
3, 12, 19, 27, 41, 9, 16, 20, 25
C. I. Acid Brown
4,14
Etc. are used.
[0032]
The basic dye is not particularly limited. For example,
C. I. Basic Black
2,8
C. I. Basic Yellow
1, 2, 11, 12, 14, 21, 32, 36
C. I. Basic Orange
2,15,21,22
C. I. Basic Red
1, 2, 9, 12, 13, 37
C. I. Basic Violet
1, 3, 7, 10, 14
C. I. Basic Blue
1, 3, 5, 7, 9, 24, 25, 26, 28, 29
C. I. Basic Green
1, 4
C. I. Basic Brown
1,12
Etc. are used.
[0033]
Although it does not specifically limit as a reactive dye, For example,
C. I. Reactive Black
1,3,5,6,8,12,14
C. I. Reactive Yellow
1, 2, 3, 13, 14, 15, 17
C. I. Reactive Orange
2, 5, 7, 16, 20, 24
C. I. reactive red
6, 7, 11, 12, 15, 17, 21, 23, 24, 35, 36, 42
C. I. Reactive Violet
2, 4, 5, 8, 9
C. I. Reactive Blue
2, 5, 7, 12, 13, 14, 15, 17, 18, 19, 20, 21, 25
C. I. Reactive Green
5,7
C. I. Reactive Brown
1,7,16
Etc. are used.
[0034]
Furthermore, the food coloring is not particularly limited, for example,
C. I. Food Black
2
C. I. Food Yellow
3,4,5
C. I. Food Red
2, 3, 7, 9, 14, 52, 87, 92, 94, 102, 104, 105
C. I. Food Violet
2
C. I. Food Blue
1, 2
C. I. Food Green
2, 3
Etc. are used.
[0035]
As the liquid medium of the aqueous ink, water and various water-soluble organic solvents, for example, polyhydric alcohols such as diethylene glycol, lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether are preferable. Is. Examples of other additives include pH adjusters, metal sequestering agents, antifungal agents, viscosity modifiers, surface tension modifiers, wetting agents, surfactants, and rust inhibitors.
[0036]
The glossy paper of this embodiment is not limited to the water-based ink described above, and can be used as various recording media that use ink that is liquid during recording. As such a recording medium, for example, a hot-melt room temperature solid ink mainly composed of waxes, resin components, dyes and pigments is melted on a thin support such as a resin film, high-density paper or synthetic paper. The coated ink sheet is used as a donor sheet, heated from the back side of the ink on the donor sheet, and a hot-melt transfer recording medium for transferring the ink by melting it. Ink jet recording medium for recording, flying recording, ink jet recording medium using ink in which oil-soluble dye is dissolved in solvent, photopolymerizable monomer, photosensitive pressure sensitive type using microcapsules containing colorless or colored dye and / or pigment Examples thereof include an image receiving recording medium of a donor sheet. What is common in these recording media is that the ink is in a liquid state during recording. The liquid ink penetrates or spreads in the depth direction or the surface direction of the ink receiving layer of the recording medium until it is cured, solidified, or fixed. For this reason, the recording medium also needs to have absorptivity according to each method. Therefore, the glossy paper according to the present invention can be used as the various recording media described above.
[0037]
Hereinafter, specific examples will be described.
(Reference Example 1)
1. Ink-receiving layer 100 parts by weight of synthetic silica as filler, 40 parts by weight of polyvinyl alcohol as binder, 25 parts by weight of polyamine derivative as ink fixing agent, urea glyoxal / acrylamide weight as water-resistant agent The coalescence was mixed at 5 parts by weight to form a coating composition 14 '. 10 g / m ² (DRY) of this coating composition 14 ′ was coated on high quality paper as the base material 12 to form an ink receiving layer 14. When 2 microliters of liquid ink was dropped onto the ink receiving layer 14 with a micropipette, the time until the ink was completely absorbed was 15 seconds.
2. Gelling Agent Layer A thin gelling material layer was formed by applying a 4% boric acid aqueous solution, for example, 0.24 g / m ² (DRY) on the ink receiving layer 14 of the above 1 and drying it.
3. Gloss layer 100 parts by weight of colloidal silica and 10 parts by weight of PVA as a gelling agent are mixed to prepare a coating composition 16a, and 7 g / m ² (DRY) is applied onto the gelling agent layer ² and dried. The glossy layer 16 was formed by coating, and the glossy paper 10 was completed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0038]
(Reference Example 2)
1. Ink Receiving Layer The ink receiving layer 14 was formed in the same manner as in Reference Example 1 described above.
2. Gelling agent layer A thin gelling agent layer was formed by applying a 0.5% aqueous copper sulfate solution, for example, 0.24 g / m ² (DRY) on the ink receiving layer 14 of the above 1 and drying it.
3. Glossy layer 100 parts by weight of colloidal silica and 15 parts by weight of casein as a gelling agent are mixed to prepare the coating composition 16a, and 7 g / m ² (DRY) is applied onto the gelling agent layer ² and dried. Thus, the gloss layer 16 was formed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0039]
(Reference Example 3)
1. Ink Receiving Layer The ink receiving layer 14 was formed in the same manner as in Reference Example 1 described above.
2. Gelling agent layer A thin gelling agent layer was formed by applying a 1.0% calcium hydroxide aqueous solution, for example, 0.24 g / m ² (DRY) on the ink receiving layer 14 of the above 1 and drying it.
3. Glossy layer 100 parts by weight of colloidal silica and 10 parts by weight of alginic acid as a gelling agent are mixed to prepare a coating composition 16a, and 7 g / m ² (DRY) is applied onto the gelling agent layer ² and dried. Thus, the gloss layer 16 was formed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0040]
(Comparative Example 1)
When the glossy paper 10 was formed using the same composition as in Reference Examples 1, 2, and 3 without forming the gelling agent layer, the coating composition 16a for forming the glossy layer was formed on the ink receiving layer 14. It penetrated and was absorbed, and none of the desired gloss could be obtained.
[0041]
(Reference Example 4)
1. Ink-Receiving Layer The ink-receiving layer 14 is prepared by applying 10 g / m ² (DRY) on a fine paper as a base material 12 and mixing the liquid prepared by mixing a 4% boric acid aqueous solution with the composition of Reference Example 1 described above and drying. Formed by.
2. Gloss layer 100 parts by weight of colloidal silica and 10 parts by weight of PVA as a gelling agent are mixed to prepare a coating composition 16a, and 7 g / m ² (DRY) is applied onto the ink receiving layer 14 and dried. The glossy layer 16 was formed by coating, and the glossy paper 10 was completed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0042]
(Example 1)
1. Ink-Receiving Layer The ink-receiving layer 14 was applied by applying 10 g / m ² (DRY) on a high-quality paper as a base material 12 by mixing a liquid prepared by mixing the composition of Reference Example 1 with a 0.5% aqueous copper sulfate solution and drying. Formed.
2. Glossy layer 100 parts by weight of colloidal silica and 15 parts by weight of casein as a gelling agent are mixed to prepare a coating composition 16a, and 7 g / m ² (DRY) is applied onto the ink receiving layer 14 and dried. Thus, the gloss layer 16 was formed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0043]
(Example 2)
1. Ink-Receiving Layer The ink-receiving layer 14 is prepared by applying 10 g / m ² (DRY) onto fine paper as a base 12 using a liquid prepared by mixing 1.0% calcium hydroxide aqueous solution with the composition of Reference Example 1 described above. Formed by drying.
2. Glossy layer 100 parts by weight of colloidal silica and 10 parts by weight of alginic acid as a gelling agent are mixed to prepare a coating composition 16a, and 7 g / m ² (DRY) is applied onto the ink receiving layer 14 and dried. Thus, the gloss layer 16 was formed.
As a result, the gloss layer 16 having a desired gloss could be formed on the ink receiving layer 14 having a high liquid ink absorption rate.
[0044]
(Comparative Example 2)
When the glossy paper 10 was formed using the same composition as in Examples 1 and 2 described above without containing the gelling agent and the gelling agent, the coating composition 16a for forming the glossy layer was the ink receiving layer. 14 penetrated and absorbed, and none of them could obtain a desired gloss.
[0045]
【The invention's effect】
According to the present invention, it is possible to obtain a liquid ink recording glossy paper which absorbs and fixes liquid ink quickly and has high gloss.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of liquid ink recording glossy paper according to an embodiment of the present invention.
FIG. 2 is an illustrative sectional view showing a process of attaching a film on the material of the glossy layer in order to produce the glossy paper for recording liquid ink shown in FIG. 1;
3 is a cross-sectional view showing a process of laminating a glossy layer formed on a film on a material for an intermediate layer in order to produce the glossy paper for recording liquid ink shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Glossy paper for liquid ink recording 12 Base material 14 Ink receiving layer 16 Glossy layer 16a Coating composition for forming glossy layer 18 Film

Claims (4)

A step of preparing a base material, a step of forming an intermediate layer constituting an ink receiving layer for receiving liquid ink on one main surface thereof, and a plurality of micropores on a surface of the intermediate layer opposite to the base material Forming a glossy layer formed such that the liquid ink soaks into the intermediate layer from the micropores, and the intermediate layer includes the following ( 1) to ( 2 ) containing any gelling agent, and the glossy layer containing a gelling agent that reacts with the gelling agent contained in the intermediate layer. At the time of formation, the coating composition for forming the glossy layer penetrates the intermediate layer by reacting the gelling agent contained in the glossy layer with the gelling agent contained in the intermediate layer to cause gelation. To prevent Method for producing a click recording glossy paper.
Combination of gelling agent and gelling agent that reacts with the gelling agent:
(1) copper sulfate and casein (2) calcium, barium, aluminum, copper or iron metal salts and alginic acid   In the step of forming the gloss layer, a gloss layer forming coating composition is applied on the intermediate layer, and the smooth surface of a film having a smooth surface is adhered onto the coating composition to form the gloss layer. The method for producing glossy paper for liquid ink recording according to claim 1, wherein the film is peeled from the glossy layer.   In the step of forming the gloss layer, a coating composition for forming a gloss layer is applied to the smooth surface of a film having a smooth surface, and the coating composition is laminated on the intermediate layer to form the gloss layer. 2. The method for producing glossy paper for liquid ink recording according to claim 1, wherein the film is peeled off from the glossy layer.   4. The liquid ink recording according to claim 1, wherein the intermediate layer includes a pigment that absorbs an ink fixing agent and an ink dye, and is formed so that the liquid ink is adsorbed to the pigment. For producing glossy paper.

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