JP2001334746A - Glossy paper for liquid ink recording and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glossy paper for liquid ink recording and a method of manufacturing the same having a fast rate of absorption and fixation of a liquid ink such as an ink-jet ink and also having a high glossiness. SOLUTION: The method of manufacturing the glossy paper for liquid ink recording 10 comprises the steps of providing a base material 12, of forming an intermediate layer 14 on one of the main surfaces of the base material 12, and of forming a glossy layer 16 on top of the intermediate layer 14, wherein the glossy layer 16 is made up of a colloidal material having a viscosity of 20 mPa.s or higher including an inorganic or organic substance and a water-soluble resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ink recording medium for printing, for example, an ink jet ink with an ink jet printer, and particularly to a glossy liquid ink recording paper having gloss and a method of manufacturing the same.

[0002]

2. Description of the Related Art In an ink jet recording system, minute droplets of ink are discharged from minute nozzles and fixed on a recording sheet such as paper to record images and characters.
There are many operating principles. This ink jet recording system has features such as high speed, low noise, easy multi-coloring, great flexibility of recording pattern, and no need for development and fixing. Used in various applications.

[0003]

The recording medium used in this ink jet recording system has a high density of printed dots, a fast absorption of ink jet ink, and a dot overlap when printed. In such a case, it is required that the ink does not flow or bleed, and that the dots in the horizontal direction when printed are not unnecessarily large and are not blurred. Further, since a recording medium having a higher surface gloss is conventionally preferred by consumers, an inkjet recording medium having a glossy finish has been proposed. Is desired. However, providing a glossy layer with high gloss on the intermediate layer having a high absorption of the ink jet ink has a disadvantage that the material of the glossy layer is easily absorbed by the intermediate layer, so that gloss is hardly generated.

SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to provide a glossy paper for recording a liquid ink which has a high absorption and fixing speed of a liquid ink such as an ink jet ink and has a high glossiness, and a method for producing the same.

[0005]

According to the present invention, there is provided a method for producing glossy paper for liquid ink recording according to the present invention, comprising the steps of: preparing a base material; forming an intermediate layer on one main surface thereof; Forming a glossy layer, the glossy layer having a viscosity of 20 including an inorganic or organic substance and a water-soluble resin.
This is a method for producing glossy paper for liquid ink recording, which is formed of a colloidal material of mPa · s or more.

In the step of forming a glossy layer in the method for producing glossy paper for liquid ink recording according to the present invention, a glossy layer material is applied on the intermediate layer, and a smooth surface is provided on the glossy layer material. After the smooth surface of the film is brought into close contact with the film and a gloss layer is formed, the film may be peeled from the gloss layer.

In the method for producing a glossy paper for liquid ink recording according to the present invention, in the step of forming a glossy layer, a glossy layer material is applied to the smooth surface of a film having a smooth surface, and the glossy layer material is formed. May be laminated on the intermediate layer to form a gloss layer, and then the film may be peeled from the gloss layer.

Further, in the method for producing a glossy paper for liquid ink recording according to the present invention, the glossy layer may be formed using a material containing a colloidal silica composite emulsion and having a viscosity of 20 mPa · s or more.

In the method for producing a glossy paper for liquid ink recording according to the present invention, the glossy layer has a viscosity of 20 mPa · s or more obtained by mixing a water-soluble resin or an emulsion resin with a filler having low water absorption such as colloidal silica. May be formed using the above material.

Further, in the method for producing a glossy paper for liquid ink recording according to the present invention, the viscosity of the material of the glossy layer may be adjusted by the amount of the viscosity modifier added.

In the method for producing a glossy paper for liquid ink recording according to the present invention, the intermediate layer constitutes an ink receiving layer for receiving the liquid ink, and a plurality of fine holes are formed in the glossy layer. It is preferable that the liquid ink penetrates into the intermediate layer from the fine holes.

Further, in the method for producing a glossy paper for liquid ink recording according to the present invention, the intermediate layer includes an ink fixing agent and a pigment that absorbs a dye or the like of the ink, and is formed such that the liquid ink is absorbed by the pigment. Is preferably performed.

In the method for producing a glossy paper for liquid ink recording according to the present invention, the pigment of the intermediate layer preferably contains synthetic silica.

Further, the glossy paper for liquid ink recording according to the present invention has a glossy layer or an intermediate layer formed by any of the methods described above.

According to the invention of the present application, the viscosity of the material for the gloss layer is 20 m, which contains an inorganic or organic substance and a water-soluble resin.
Since a colloidal material of Pa · s or more is used, the material is prevented from penetrating into the intermediate layer, and a gloss layer having desired glossiness can be formed on the intermediate layer. Further, there is no inconvenience that the material permeates the intermediate layer and fills the voids in the intermediate layer to reduce the absorption capacity of ink. This allows
The two requirements of high ink receiving speed and high glossiness can be simultaneously achieved. For example, the ink jet ink discharged by the ink jet printer permeates in the thickness direction from the surface of the glossy layer and is quickly adsorbed to the intermediate layer. By mixing a pigment that adsorbs ink into the intermediate layer, the ink adsorption speed can be increased.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the drawings.

[0017]

FIG. 1 is a schematic sectional view of a glossy paper for liquid ink recording according to an embodiment of the present invention. The glossy paper 10 for liquid ink recording is provided on one main surface (front surface) of a base material 12 made of a high-quality paper or a synthetic resin film / sheet or the like as an ink receiving layer serving as an intermediate layer for receiving an oily or aqueous inkjet ink. A layer 14 is formed, and a gloss layer 16 located on the outermost surface is formed on a main surface (front surface) of the ink receiving layer 14 opposite to the main surface on the substrate 12 side.

The ink receiving layer 14 is formed on the base material 12 serving as a support material.
And at least one layer between the gloss layer 16. The coating composition 14 'for forming the ink receiving layer 14 is obtained 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.

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, and boehmite. And pseudo-boehmite. In terms of not lowering the transparency, the refractive index is 1.4.
Those in the range of 0 to 1.60 are preferred, and silica fine particles are particularly preferred. The average primary particle diameter 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. Further, the refractive index is preferably around 1.45. Silica fine particles can easily adhere to each other due to hydrogen bonding due to silanol groups on the surface. Further, when the average primary particle diameter is 10 nm or less, it is possible to form a structure having 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 according to the production method. In the wet method, the mainstream is a method in which active silica is generated by acid decomposition of a silicate, which is appropriately polymerized, coagulated and sedimented to obtain hydrous silica. 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 an arc in an electric furnace and oxidized with air ( The method of obtaining anhydrous silica by the arc method is the mainstream. These hydrated silica and anhydrous silica have different properties in terms of the density of silanol groups on the surface, the presence or absence of vacancies, etc., and exhibit different properties, respectively. In the case of silicic anhydride (anhydrous silica), three-dimensional porosity is particularly high. It is known to form structures and is preferred for use in the present invention. In the case of silica fine particles, the type of resin to be combined with the silica fine particles is important from the viewpoint of transparency of the porous layer. In the case of anhydrous silica, polyvinyl alcohol (PVA) is used as a water-soluble resin.
It is particularly preferable to use polyvinyl alcohol having a low saponification degree, specifically, a saponification degree of 70 to 90%, from the viewpoint of light transmission. PVA has a hydroxyl group in the structural unit, and the hydroxyl group and a silanol group on the surface of the silica fine particles form a hydrogen bond to facilitate formation of a three-dimensional network structure in which the secondary particles of the silica fine particles are chain units. Thus, it is considered that a coloring material receiving layer having a structure with a high porosity can be obtained. The porous layer having a three-dimensional network structure rapidly absorbs ink by capillary action in ink jet recording, and enables not only fine recording without ink bleeding and ink accumulation, but also coloring material in thermal recording, Then, the toner in the electrophotographic recording can be firmly bonded. That is, the coloring material or the toner penetrates into the pores of the porous layer, and the three-dimensional network structure causes a shape anchor effect, whereby the coloring material or the like is firmly fixed. Further, since the ratio of the inorganic fine particles constituting the transparent layer is large, the heat resistance is high and the emboss resistance is high.

Examples of the ink fixing agent (cationizing agent) constituting the coating composition 14 'include quaternary ammonium salt polymers, polyamines and derivatives thereof, alkylamine polymers, and dicyandiamide type cationic resins. In particular, secondary amines, tertiary amines, and quaternary ammonium salts which form insoluble salts with sulfonic acid groups, carboxyl groups, amino groups, etc. in water-soluble direct dyes and water-soluble acid dyes which are the dye components of aqueous inks When the cationic ink fixing agent is mixed, the dye is captured in the ink receiving layer 14. Therefore, it is possible to suppress the outflow and bleeding of the ink when water is dropped or when moisture is absorbed due to the improvement in color and the formation of an insoluble salt.

As the binder constituting the coating composition 14 ', PVA such as silicon-modified polyvinyl alcohol, starch, SBR latex, acrylic resin,
Urethane resins and the like can be mentioned. More specifically, the binder includes, for example, starch derivatives such as oxidized starch, etherified starch, and phosphated starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose; casein, gelatin, soy protein,
Polyvinyl alcohol or derivatives thereof; polyvinyl alcohol of various degrees of oxidation or silanol modified products thereof, carboxylated products, cationized products, etc .; polyvinyl pyrrolidone, maleic anhydride resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer Such as conjugated diene copolymer latex; acrylic polymer latex such as acrylate and methacrylate polymer or copolymer; vinyl polymer latex such as ethylene vinyl acetate copolymer; Functional group-modified polymer latex with a monomer containing a functional group such as a carboxy group of a coalescence; melamine resin,
Aqueous adhesives such as thermosetting synthetic resins such as urea resins; acrylics such as polymethyl methacrylate; acid esters; polymer or copolymer resins of methacrylic acid esters; polyurethane resins, unsaturated polyester resins, vinyl chloride-vinyl acetate Synthetic resin-based adhesives such as copolymers, polyvinyl butyral, and alkyd resins can be used.

In addition, the coating composition 14 'for forming the ink receiving layer 14 may contain a water-resistant agent such as a melamine resin, if necessary. Further, other components may be added to the coating composition 14 'for various purposes. For example, viscosity dispersants such as pigment dispersants and thickeners, flow improvers, defoamers, foam inhibitors, mold release agents, foaming agents, penetrants, coloring dyes, coloring pigments, fluorescent brighteners, ultraviolet light Various additives such as an absorbent, an antioxidant, a preservative, an anti-binder, a wet paper strength enhancer, and a dry paper strength enhancer can be appropriately compounded according to the purpose.

The mixing ratio of the pigment and the binder in the coating composition 14 'for forming the ink receiving layer 14 is such that the binder is 3 to 70 parts by weight with respect to 100 parts by weight of the pigment, and more preferably 5 to 70 parts by weight. 50 parts by weight, but the mixing ratio of the binder to 100 parts by weight of the pigment is 3
If the amount is less than the weight part, the coating strength of the ink receiving layer 14 may be insufficient. On the other hand, if the blending ratio of the binder exceeds 70 parts by weight, the ink absorbency of the ink receiving layer 14 may decrease.

An example of the mixing ratio of the pigment and the binder in the coating composition 14 'for forming the ink receiving layer 14 is as follows. For example,
100 parts by weight of solid or powdery amorphous silica (silicon dioxide SiO ₂ ) which is a porous material as a pigment, 45 parts by weight of polyvinyl alcohol as a binder and 45 parts by weight of a liquid material as an ink fixing agent 30 parts by weight of a polyamine derivative of the above, 10 parts by weight of an acetal (formal) as a waterproofing agent, and 1 part by weight of a powdery hexametaphosphoric acid as a dispersant were mixed, An ink receiving layer 14 can be formed.

The coating amount of the coating composition 14 'for forming the ink receiving layer 14 varies depending on the required gloss, ink absorbency, type of the support, and the like, and cannot be determined unconditionally. / M ² or more, preferably 5 to 1
5 g / m ² . Further, the ink receiving layer 14 may be provided by applying a predetermined coating amount twice or more.

The application of the coating composition 14 ′ for forming the ink receiving layer 14 can be performed by using various coating apparatuses on-machine or off-machine. Examples of the coating device include various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters, size presses, and the like. After the ink receiving layer 14 is applied to smooth the ink receiving layer 14, the ink receiving layer 14 may be flattened using a calender such as a machine calender, a TG calender, or a soft calender.
The number of the ink receiving layers 14 can be appropriately determined as needed, and may be one layer or a plurality of layers.

Next, the gloss layer 16 will be described. The gloss layer 16 has transparency and is composed of a coating composition 16a made of a colloidal silica composite emulsion or the like, and is provided at least one layer on the substrate 12 serving as a support and the ink receiving layer 14. As the colloidal silica composite emulsion, colloidal silica / acryl / styrene or colloidal silica / acryl can be selected. The coating composition 16a for forming the gloss layer 16 may be composed mainly of a colloidal silica composite emulsion or composed mainly of a mixture of a filler and a binder. As the filler in this case, the same pigment as the ink absorbing pigment used in the ink receiving layer 14 described above can be used, but colloidal silica is preferred. Further, as the binder, the same one as the above-mentioned ink receiving layer 14 can be used, but a water-soluble resin is preferable. Examples of the water-soluble resin include a resin having a dissociable group such as a hydrophilic structural unit or a carboxyl group,
For example, polyvinyl alcohol (PVA), which is a resin having a hydroxyl group as a hydrophilic structural unit, cellulosic resins (methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HE)
C), carboxymethylcellulose (CMC), chitins and starch; polyethylene oxide (PEO), polypropylene oxide (PPO), polyethylene glycol (PE) which are resins having an ether bond.
G) and polyvinyl ether (PVE); and polyacrylamide (PAAM) and polyvinylpyrrolidone (PV), which are resins having an amide group or an amide bond.
P). Also, polyacrylates having a carboxyl group as a dissociable group, maleic acid resins, alginates and gelatins; polystyrene sulfonates having a sulfone group, amino groups, imino groups,
Mention may be made of polyallylamine (PAA) with amines and quaternary ammonium salts, polyethyleneimine (PEI), epoxidized polyamide (EPAm), polyvinylpyridine and gelatins. 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 amount of the water-soluble resin is 0.001 or less, the coating strength of the glossy layer is hardly obtained and the coatability is poor. It does not pass through layer 16 to ink receiving layer 14. In order to appropriately impart water resistance to polyvinyl alcohol or the like, for example, a water-resistant agent of a urea glyoxal / acrylamide polymer may be mixed or a curing agent may be mixed.

The viscosity of the coating composition 16a for forming the gloss layer 16 is 20 to 25 ° C. using a B-type viscometer (6
When measured at 0 rpm), the coating composition 16a indicates that the coating composition 16a is at least 20 mPa · s.
4, so that the function of the ink receiving layer 14 is not hindered. The viscosity of the coating composition 16a is used as it is when the viscosity becomes favorable by blending the above-mentioned materials. If not, it is adjusted with a viscosity modifier such as a thickener. Examples of the viscosity modifier include sodium alginate, propylene glycol alginate, sodium caseinate, sodium carboxymethyl cellulose, sodium cellulose glycolate, sodium starch glycolate, sodium starch phosphate, sodium polyacrylate, methyl cellulose, and the like. Synthetics,
Natural gums such as gum arabic, alginic acid, casein, guar gum, gluten, starch, locust bean gum and the like can be used. Further, a water-soluble resin having a high viscosity such as PVA may be used.

The glossy paper 10 is formed so that the surface of the glossy layer 16 is smooth, thereby forming the glossy paper 10 for liquid ink recording having a beautiful gloss. In order to manufacture such a glossy paper 10 for liquid ink recording, first, a coating composition 16a for forming a glossy layer 16 is applied on a substrate 12, and as shown in FIG. The smooth surface of the film 18 is brought into close contact with 16a. As the film 18 having a smooth surface, for example, a polyethylene film, a polypropylene film,
Polyamide (nylon) film, polyester film, polyethylene naphthalate film, polystyrene film, polyvinyl alcohol (vinylon) film, polyetherketone film, polysulfone film, polyethersulfone film, polyetherimide film, EVA copolymer film, Ethylene copolymer films such as ionomer films, polycarbonate films, cellophane films, polyvinyl chloride films, polyvinylidene chloride films, aluminum foils, films such as acetate films, and other films having a smooth surface alone, or these Paper and film to which a film is attached can be used.
In order to improve the releasability from the gloss layer 16, a release agent may be applied to the smooth surface.

After the smooth surface of the film 18 is brought into close contact with the applied coating composition 16a, the coating composition 16a is dried into a film to form a gloss layer 16, and then the film 18 is peeled off. In FIG. 2, the material 16a of the glossy layer indicated by diagonal lines 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 gloss paper 10 can be obtained. Therefore, in the manufacturing process of the glossy paper 10, the manufacture of the glossy paper can be simplified without the need of an ultraviolet irradiation device or the like. In the step of applying the coating composition 16a, the same apparatus as that exemplified as the apparatus for applying the coating composition 14 'can be used.

As another method, in order to form the gloss layer 16, a 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 dries, the layer of gloss layer material 16a is pressed against the surface of the ink receiving layer 14. Then, after the gloss layer 16 is dried and the gloss layer 16 is formed, the film 18 is peeled from the gloss layer 16. As described above, the gloss layer material 16a may be applied to the substrate 12 side, or may be applied to the film 18 side.
By peeling the film 18 after the gloss layer 16 is formed, gloss paper 10 having gloss can be obtained.

The glossy layer 16 of the glossy paper 10 is formed as a porous film or layer having a plurality of fine holes. Liquid ink such as ink-jet ink supplied from an ink-jet printer or the like passes through the glossy layer 1 through fine holes.
6 and soaks into the ink receiving layer 14 and is fixed.

Next, the liquid ink applied to the glossy paper 10 for ink jet recording of this embodiment will be described. This liquid ink is an aqueous ink, and the aqueous ink is a recording liquid including a colorant, a liquid medium, and other additives. As the coloring agent, a direct dye, an acid dye, a basic dye, a reactive dye, or a water-soluble dye such as a food colorant is used.

Examples of the direct dye include, but are not limited to, C.I. I. Direct Black 48, 49, 51, 56, 62, 71, 74, 75, 7
7, 78, 80 C.I. I. Direct Yellow 42, 44, 48, 50, 51, 58, 72, 85, 8
6,87,88,98 C.I. I. Direct Orange 77, 80, 81, 83, 84, 85, 90, 94, 9
9, 101, 108 C.I. I. Direct Red 75, 77, 80, 81, 83, 84, 85, 90, 9
4,99,101 C.I. I. Direct Blue 120, 123, 158, 163, 165, 192, 1
93, 194, 195 C.I. I. Direct Green 1, 6, 8, 28, 33, 37, 63, 64 C.I. I. Direct Brown 2,6,25,27,44,58,95,100,10
6, 112, 173 and the like are used.

The acid dye is not particularly limited, but examples thereof include C.I. I. Acid Black 60, 94, 107, 109, 112, 118, 11
9, 121, 122 C.I. I. Acid Orange 7, 8, 10, 33, 56, 64 C.I. I. Acid Red 85, 87, 88, 89, 92, 94, 97, 106,
108, 110 C.I. I. Acid Violet 7, 11, 15, 34, 35, 41, 43, 49, 75 C.I. I. Acid Blue 93, 102, 104, 111, 113, 117, 12
0, 124, 126 C.I. I. Acid Green 3, 12, 19, 27, 41, 9, 16, 20, 25 C.I. I. Acid Brown 4,14 and the like are used.

The basic dye is not particularly restricted but includes, for example, C.I. I. Basic Black 2,8 C.I. I. Basic Yellow 1, 2, 11, 12, 14, 21, 32, 36 C.I. I. Basic Orange 2,15,21,22 C.I. I. Basic Red 1, 2, 9, 12, 13, 37 C.I. I. Basic Violet 1,3,7,10,14 C.I. I. Basic Blue 1,3,5,7,9,24,25,26,28,29 C.I. I. Basic Green 1,4 C.I. I. Basic Brown 1,12 or the like is used.

The reactive dye is not particularly restricted but includes, for example, C.I. I. Reactive Black 1,3,5,6,8,12,14 C.I. I. Reactive Yellow 1,2,3,13,14,15,17 C.I. I. Reactive Orange 2,5,7,16,20,24 C.I. I. reactive Red 6,7,11,12,15,17,21,23,24,
35, 36, 42 C.I. I. Reactive Violet 2,4,5,8,9 C.I. I. Reactive Blue 2,5,7,12,13,14,15,17,18,1
9, 20, 21, 25 C.I. I. Reactive Green 5, 7 C.I. I. Reactive Brown 1, 7, 16 and the like are used.

Further, the food colorant is not particularly limited. I. Food Black 2 C.I. I. Food Yellow 3,4,5 C.I. I. Food Red 2,3,7,9,14,52,87,92,94,10
2,104,105 C.I. I. Food Violet 2 C.I. I. Food Blue 1,2 C.I. I. Food Green 2,3 or the like is used.

Examples of the liquid medium of the aqueous ink include water and various water-soluble organic solvents, for example, polyhydric alcohols such as diethylene glycol, and lower alkyls of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether. Ethers are preferred. Other additives include, for example, p
Examples include H regulators, sequestering agents, fungicides, viscosity regulators, surface tension regulators, wetting agents, surfactants, and rust inhibitors.

Hereinafter, specific embodiments will be described. (Comparative Example 1) Ink receiving layer 100 parts by weight of synthetic silica as a filler, 40 parts by weight of polyvinyl alcohol as a binder, and 2 parts by weight of a polyamine derivative as an ink fixing agent.
5 parts by weight and 5 parts by weight of a urea glyoxal / acrylamide polymer as a waterproofing agent were mixed at a weight ratio to form a coating composition 14 '. 10 g / m ² (D
RY) was applied to form an ink receiving layer 14. When 2 microliters of the liquid ink was dropped onto the ink receiving layer 14 with a micropipette, the time until the ink was completely absorbed was 15 seconds. Glossy layer Colloidal silica 95 parts by weight and 10% aqueous solution have viscosity of 4
When a coating composition 16a was prepared by mixing 5 parts by weight of 8 mPa · s PVA, the viscosity was 19 mPa · s.
Was obtained as a coating composition 16a. The coating composition 16a was coated on the ink receiving layer 14 with 7 g /
When the gloss layer 16 was formed by applying and drying m ² (DRY), the desired gloss was not obtained.

Example 1 An ink receiving layer 14 was formed on a high quality paper base material 12 in the same manner as in the comparative example. A viscosity of 800 m with 95 parts by weight of colloidal silica and 10% aqueous solution
When 5 parts by weight of Pa · s PVA was mixed to prepare a coating composition 16a, a coating composition 16a having a viscosity of 43 mPa · s was obtained. When the gloss layer 16 was formed on the ink receiving layer 14 by the above-described method using the coating composition 16a, desired gloss was obtained.

Example 2 An ink-receiving layer 14 was formed on a high-quality paper base material 12 in the same manner as in the comparative example. A coating composition 16a was prepared by mixing 95 parts by weight of colloidal silica and 5 parts by weight of casein.
3 mPa · s of the coating composition 16a was obtained.
When the gloss layer 16 was formed on the ink receiving layer 14 by the above-described method using the coating composition 16a, desired gloss was obtained.

Example 3 An ink receiving layer 14 was formed on a high-quality paper base material 12 in the same manner as in the comparative example. Table 1 shows the results of forming the gloss layer 16 on the three coating compositions 16a whose viscosity was adjusted with alginic acid.

[0044]

[Table 1]

As is clear from Table 1, the viscosity was 20 mP
When a coating composition 16a of at least as is used,
The desired gloss can be imparted even on the ink absorbing layer having a high absorption. However, when the coating composition 16a having a viscosity of less than 20 mPa · s was used, the desired gloss was not obtained because the coating composition 16a was absorbed by the ink-receiving layer 14 having a high absorption.

The glossy paper for liquid ink recording of this embodiment can be used not only for the aqueous ink described above but also for various recording media using ink that is liquid at the time of recording. As such a recording medium, for example,
The donor sheet is an ink sheet obtained by applying a hot-melt room-temperature solid ink consisting mainly of waxes and resin components and dyes and pigments to a thin support such as a resin film, high-density paper, or synthetic paper. A hot-melt transfer recording medium that heats from the back surface of the ink of the donor sheet to melt and transfer the ink, an ink-jet recording medium that heats and melts the hot-melt room-temperature solid ink as described above to form fine droplets, and performs flight recording, oil Examples include an ink jet recording medium using an ink in which a soluble dye is dissolved in a solvent, an image receiving recording medium of a photosensitive pressure-sensitive donor sheet using microcapsules containing a photopolymerizable monomer, a colorless or colored dye and / or a pigment, and the like. . What is common to these recording media is that the ink is in a liquid state during recording.
The liquid ink permeates 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.

[0047]

According to the present invention, it is possible to obtain a glossy paper for recording a liquid ink, which has a high absorption and fixing speed of the liquid ink and has a high glossiness.

[Brief description of the drawings]

FIG. 1 is an illustrative sectional view of a glossy paper for liquid ink recording according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a step of attaching a film on a material of a gloss layer in order to produce the glossy paper for liquid ink recording shown in FIG.

FIG. 3 is a schematic sectional view showing a step of laminating a gloss layer formed on a film on a material of an intermediate layer in order to manufacture the glossy paper for liquid ink recording shown in FIG.

[Explanation of symbols]

 Reference Signs List 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 (11)

[Claims] 1. A method for producing glossy paper for liquid ink recording, comprising the steps of: preparing a base material; forming an intermediate layer on one main surface thereof; and forming a glossy layer on the surface of the intermediate layer. The method for producing a glossy paper for liquid ink recording, wherein the glossy layer is formed of a material containing an inorganic or organic substance and a water-soluble resin and having a viscosity of 20 mPa · s or more. 2. In the step of forming the gloss layer, a material of the gloss layer is applied on the intermediate layer, and the smooth surface of a film having a smooth surface is brought into close contact with the material of the gloss layer, and The method for producing a glossy paper for liquid ink recording according to claim 1, wherein the film is peeled from the glossy layer after forming the layer. 3. In the step of forming the glossy layer, the material of the glossy layer is applied to the smooth surface of a film having a smooth surface, and the material of the glossy layer is laminated on the intermediate layer. The method for producing a glossy paper for liquid ink recording according to claim 1, wherein the film is peeled from the glossy layer after forming the glossy layer. 4. The gloss for liquid ink recording according to claim 1, wherein the gloss layer is formed using a material containing a colloidal silica composite emulsion and having a viscosity of 20 mPa · s or more. Paper manufacturing method. 5. The gloss layer is formed using a material having a viscosity of 20 mPa · s or more obtained by mixing a water-soluble resin or an emulsion resin with a filler having low water absorption such as colloidal silica. Item 4. The method for producing a glossy paper for liquid ink recording according to any one of Items 3. 6. The viscosity of the gloss layer material is adjusted by the amount of a viscosity modifier added.
The method for producing a glossy paper for liquid ink recording according to any one of the above. 7. The intermediate layer constitutes an ink receiving layer for receiving liquid ink, a plurality of fine holes are formed in the gloss layer, and the liquid ink permeates the intermediate layer from the fine holes. The method for producing a glossy paper for liquid ink recording according to any one of claims 1 to 6, wherein the glossy paper is formed as described above. 8. The method according to claim 1, wherein the intermediate layer includes an ink fixing agent and a pigment that absorbs a dye or the like of the ink, and is formed such that the liquid ink is absorbed by the pigment. A method for producing the glossy paper for liquid ink recording according to the above. 9. The pigment of the intermediate layer contains synthetic silica.
A method for producing the glossy paper for liquid ink recording according to claim 8. 10. A glossy paper for liquid ink recording, wherein a glossy layer is formed by the method according to claim 1. Description: 11. A glossy paper for liquid ink recording, wherein an intermediate layer is formed by the method according to claim 7. Description: