JP2013226756A - Patterned paper for inkjet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide patterned paper which has fine visibility of a pattern, is superior in design and printed image quality, and is adequate for inkjet recording.SOLUTION: Patterned paper is formed by forming an inkjet ink receiving layer containing an inorganic pigment and a binder on a base paper containing a pattern organizer. The base paper is made mainly of pulp, and has the pattern organizer exposed on one surface of the base paper. The inkjet ink receiving layer is formed on at least one surface of the base paper on which the pattern organizer is exposed. The inkjet ink receiving layer contains the inorganic pigment of fine grains which include secondary particles having a volume average particle diameter of 500 nm or less and accounts for 50 to 80 mass% of the inkjet ink receiving layer. The inkjet receiving layer has a full light transmittance defined in JIS K 7105: 1981 of 90% or more.

Description

  The present invention relates to a pattern paper, and more particularly to a pattern paper having ink jet recording suitability.

  Currently, various design papers are distributed on the market, and they are widely used for applications such as brochures and catalogs, book covers, covers, flips, and strips. In particular, in the field called fancy paper, pattern papers with patterns on paper have been widely distributed. For example, the method of making paper by mixing pre-colored fibers with white stock is called "hair dyeing". It has been known for a long time. Also known are pattern papers produced by blending various dyed celluloses with exposed pulp and blended with pulp, and pattern papers expressing patterns by blending agglomerates or paper pieces or plants with papermaking raw materials. Since these pattern papers are also used for postcards, stationery, envelopes, box sticking, etc., forms with printability such as offset printing, ink jet printing, electrophotographic printing, etc. have been proposed to expand applications. It has been.

  As one of the uses of such pattern paper, in recent years, postcard papers with various patterns are commercially available. Mixed products etc. have been released and have been well received. In recent years, since inkjet printers for personal use are widespread, even postcard paper with a pattern is desired to have inkjet recording suitability.

  As a method for imparting ink jet recording suitability to a pattern paper, for example, there is a method of applying a cationic substance having ink fixability on a base paper, but sufficient ink absorbability can be obtained only by applying an ink fixing agent alone. It is difficult to get. As a method for imparting further ink jet recording suitability, for example, an ink jet ink receiving layer containing an inorganic pigment having excellent ink absorbability is provided on a base paper. As such a pattern paper having ink jet recording suitability, Patent Document 1 discloses an ink jet ink containing synthetic amorphous silica having an average particle size of 6 μm or more on the surface of a base paper containing aggregates to be a pattern. A patterned paper provided with a receiving layer is disclosed.

  As another method for imparting ink jet recording suitability to a pattern paper, there is a method of providing a pattern forming body on the surface of a recording paper having an ink jet ink receiving layer. As such a pattern paper having ink jet recording suitability, Patent Document 2 discloses a recording paper having a pattern formed by press-printing a metal foil on an ink jet ink receiving layer.

JP 2011-94253 A Japanese Patent Laid-Open No. 10-157279

  However, although the pattern paper disclosed in Patent Document 1 is satisfactory in ink jet recording suitability, there is a problem that the pattern visibility is inferior because the ink jet ink receiving layer hides the pattern on the surface of the base paper. In particular, when the pattern forming body used for the base paper is a glossy material having glitter, the glossiness due to the glossy material is impaired by hiding the pattern, resulting in poor design as a pattern paper There was a problem of becoming.

  Moreover, about the recording paper of patent document 2, although the glossiness is obtained in the pattern by foil press printing, since the pattern by metal foil is made | formed on the inkjet ink receiving layer, a foil press part absorbs inkjet ink. There was a problem that the image quality of the foil stamped part was inferior.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a pattern paper having good pattern visibility, excellent design properties, and excellent print image quality. It is to provide.

  Other objects and operational effects of the present invention will be easily understood by those skilled in the art by referring to the following description.

  In order to achieve the above object, the ink-jet recording pattern paper of the present invention is provided with an ink-jet ink receiving layer containing an inorganic pigment and a binder on a base paper containing a pattern-forming body, The main component is pulp, and a pattern formed body is exposed on at least one surface, and the inkjet ink receiving layer is provided on at least one surface of the surface on which the pattern formed body of the base paper is exposed. The inorganic pigment includes a fine inorganic pigment having a volume average particle diameter of secondary particles of 500 nm or less, and the proportion of the fine inorganic pigment in the ink-jet ink receiving layer is 50 to 80% by mass. The total light transmittance of the layer in JIS K 7105: 1981 (hereinafter sometimes referred to as “transmittance”) is 90% or more.

  According to such a configuration, since the mixing ratio of the fine inorganic pigment in the inkjet ink receiving layer is high, the transmittance of the inkjet ink receiving layer is high, and the pattern forming body contained in the base paper is hidden by the inkjet ink receiving layer. Since it is hard to be done, the visibility of a pattern is not impaired and it can be set as the pattern paper excellent in the design property. In addition, since the ink-jet ink has excellent absorbability, an ink-jet recording pattern paper excellent in ink-jet recording suitability can be obtained.

  In a preferred embodiment of the present invention, it is desirable that the fine inorganic pigment contains any one selected from synthetic amorphous silica, alumina, and alumina hydrate, or two or more of these. According to such a configuration, since the ink-jet ink absorbability of the ink-jet ink receiving layer is improved, it is possible to obtain a pattern paper for ink-jet recording having more excellent ink-jet recording suitability.

  In a preferred embodiment of the present invention, the binder preferably contains any one selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, and carboxymethyl cellulose, or two or more thereof. According to such a configuration, the ink jet recording is excellent in the texture of the pattern on the surface of the pattern paper, has high image quality in the ink jet recording, and does not easily cause problems such as dropping off of fine particles in a processing step such as a printing step or a cutting step. It can be used as a pattern paper.

  In a preferred embodiment of the present invention, as the inorganic pigment, a synthetic amorphous silica whose secondary particles have a volume average particle diameter of 5 to 20 μm is used as a ratio of 1 to 12% by mass in the inkjet ink receiving layer. It is desirable to contain in the range of. According to such a configuration, it is possible to obtain a pattern paper for inkjet recording in which the inkjet ink receiving layer maintains high transmittance and inkjet recording suitability, and also has excellent transportability in an inkjet printer.

  In a preferred embodiment of the present invention, it is desirable that the pattern forming body contains a glittering substance. According to such a configuration, it is possible to give glossiness to the pattern-formed body and to make a pattern paper for ink-jet recording that is further excellent in design.

  In preferable embodiment of this invention, it is desirable for the said pattern formation body to be mix | blended in the range of 0.2-5 mass parts with respect to the whole base paper layer containing a pattern formation body. According to such a configuration, it is possible to obtain a pattern paper for ink-jet recording that has good pattern visibility and is less likely to be peeled off during the printing process or from being removed from the paper layer during cutting.

In preferable embodiment of this invention, it is preferable that the coating amount of the said inkjet ink receiving layer is the range of 3-15 g / m < ² > in solid content. By setting the coating amount of the ink-jet ink receiving layer within this range, it is possible to obtain a pattern paper for ink-jet recording in which the balance between the ink-jet recording suitability and the visibility of the pattern-formed body is balanced.

  According to the present invention, since the ink-jet ink receiving layer has a high transmittance, the visibility of the pattern-formed body is not impaired even if the ink-jet ink receiving layer is provided on the surface of the base paper containing the pattern-formed body. An ink jet recording pattern paper satisfying the design properties as a pattern paper and excellent in ink jet recording suitability can be obtained.

  In addition, by using any one selected from synthetic amorphous silica, alumina, and alumina hydrate, or two or more of these as fine inorganic pigments, an ink jet recording pattern paper that is further excellent in ink jet recording suitability is obtained. be able to.

  In addition, as a binder to be contained in the ink-jet ink receiving layer, any one selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, and carboxymethyl cellulose, or two or more of these can be used, and the texture as a pattern paper is excellent. In addition, it is possible to obtain a pattern paper for ink-jet recording that has high image quality and is unlikely to cause problems such as dropping of fine particles in processing steps such as a printing step and a cutting step.

  Further, by containing a synthetic amorphous silica having a volume average particle diameter of secondary particles of 5 to 20 μm in a range of 1 to 12% by mass as a proportion of the inkjet ink receiving layer, the inkjet ink receiving layer is high. It is possible to obtain an ink jet recording pattern paper excellent in transportability in an ink jet printer while maintaining transmittance and ink jet recording suitability.

  Further, by adding a glittering substance to the pattern forming body, it is possible to obtain a pattern paper for ink jet recording that is further excellent in design.

  Moreover, the visibility of a pattern is good by making the mixture ratio of a pattern formation body into the range of 0.2-5 mass parts with respect to the whole base paper layer containing a pattern formation body, and also in a printing process. A pattern paper for ink-jet recording can be obtained in which the pattern-forming body is not easily dropped from the paper layer during peeling or cutting.

In addition, by setting the coating amount of the ink-jet ink receiving layer in the range of 3 to 15 g / m ² in terms of solid content, a pattern paper for ink-jet recording having a good balance between ink-jet recording suitability and pattern formation visibility is obtained. be able to.

It is a graph which shows the physical-property evaluation result of an Example and a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described, but the present invention is not limited to the following descriptions.

  As described above, the pattern paper for ink jet recording according to the present invention is intended to have both design properties as a pattern paper and ink jet recording suitability as an ink jet recording paper. In order to ensure the designability as a pattern paper, the pattern forming body for imparting design properties to the pattern paper is exposed on the surface of the pattern paper, and the visibility of the exposed pattern forming body is hindered. It is necessary not to be able to. Further, in order to maintain the suitability for ink jet recording as an ink jet recording paper, it is considered necessary to provide ink jet ink acceptability and to reduce the factors that impede ink jet ink absorption and fixing. The inventors of the present application have conducted intensive research on a pattern paper having both design and ink jet recording suitability, and have come to recall the ink jet recording pattern paper according to the present invention.

  The ink jet recording pattern paper according to the present invention comprises a base paper containing a pattern forming body and an ink jet ink receiving layer provided on the surface of the base paper where the pattern forming body is exposed. The ink jet ink receiving layer is inorganic. The composition contains a pigment and a binder.

  The base paper used for the ink-jet recording pattern paper of the present invention has a structure in which a pattern-forming body is exposed on at least one surface. The method of exposing the pattern formed body to at least one side of the base paper is not particularly limited, and a method of adding the pattern formed body into the papermaking raw material when making the base paper, A known method such as a method of applying a coating liquid containing a pattern forming body on the base paper, a method of directly pressing the pattern forming body to the surface of the base paper, or the like can be used.

  When providing a pattern forming body using a method of applying or pressure-bonding the pattern forming body, general high quality paper, medium quality paper, white paperboard or the like can be used as a paper base material as a base. In addition, the pulp used when adding the pattern former to the papermaking raw material and making it at the papermaking stage includes chemical pulp such as hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP), ground pulp, deinking General pulp such as waste paper pulp such as waste paper pulp can be used alone or in combination of two or more.

  These raw material pulps may be used in combination with one or more of various additives such as conventionally known fillers, binders, sizing agents, fixing agents, yield improvers, and paper strength enhancers as necessary. . Moreover, in this invention, you may comprise so that a pattern formation body may be made only in the layer used as the outermost layer as a base paper as a laminated paper of two or more layers.

  As a method for exposing the pattern formed body to the surface of the base paper, any of the above-described methods may be selected according to the application and the type of the pattern formed body, but among these methods, the pattern formed body does not easily fall off. For this reason, the method using paper engraving is preferable.

  Next, the pattern formed body will be described. The pattern forming body used in the present invention is not particularly limited as long as it can be recognized as a pattern when exposed on the surface of the base paper and does not impair ink jet recording suitability when used as a pattern paper for ink jet recording. A known pattern forming body used in the field of pattern paper can be appropriately selected and used. Specific examples of such a pattern forming body include colored pigments and aggregates thereof, colored fibers, fiber aggregates, and resin-based aggregates.

  In the patterned paper for inkjet recording of the present invention, the pattern forming body may contain a glittering substance. By including a glittering substance in the pattern forming body, it is possible to obtain a pattern paper for inkjet recording having a glossy feeling in the pattern and high design properties. When the pattern forming body contains a glittering substance, the glossiness of the pattern is an important factor for visibility. However, if an inkjet ink receiving layer having a low transmittance is provided on the pattern, the glossiness is remarkably increased. It will be damaged.

  However, in the pattern paper for ink-jet recording of the present invention, since the ink-jet ink receiving layer has a total light transmittance of 90% or more, the glossiness of the pattern is hardly impaired and the design is extremely excellent. And it can be set as the pattern paper for inkjet recording which has the outstanding inkjet printing aptitude. Here, as the pattern forming body containing the glittering substance, a metal piece itself having a glittering property such as gold or aluminum may be used as the pattern forming body, or the glossy pigment itself having a glittering property or an aggregate thereof may be patterned. A pearlescent pigment is preferred when a glossy pigment is used. By using such a pearl luster pigment, it is possible to obtain a pattern paper for ink-jet recording which is further excellent in gloss and design.

  Here, the pearl luster pigment is a pigment capable of giving a pearly shine by utilizing a light reflection / interference phenomenon. More specifically, by coating the surface of the flaky substrate with a metal oxide having a high refractive index, the incident light is reflected in multiple layers at the surface of the coating layer and at the interface between the substrate and the coating layer. The same glossiness is developed. Further, by changing the thickness of the base material or the coating layer, it is possible to express seven interference colors by the multilayer reflection light and the mutual interference action in the reflection light layer.

  Examples of such pearlescent pigments include those in which the surface of natural or synthetic thin film mica particles is coated with titanium oxide, and more specifically, “PEARL-GRAZE series” manufactured by Nihon Koken Kogyo. “ULTIMICA series” “PROMINENCE series” “TWINCLE PEARL series”, “Iriodin”, “Miraval”, “Colorstream” manufactured by Merck, etc.

  As described above, these glittering substances may be included in the base paper without being aggregated. However, when fine particles such as pearlescent pigments are used, they are recognized as patterns of a certain size. It can also be included in the base paper as an aggregate. There is no particular limitation on the method for forming such a pattern-forming body composed of aggregates. For example, it can be obtained by adding a metal salt to a mixture containing a glittering substance and sodium carboxymethyl cellulose. It is. Furthermore, in the present invention, the size and strength of the agglomerates can be controlled by adding cellulose fibers or chemical fibers to the mixture containing the glittering substance and sodium carboxymethyl cellulose within a range that does not impair the effects of the invention. Is possible.

  Here, the metal salt used for obtaining the pattern-forming body from the aggregate is aluminum sulfate (sulfate band), aluminum chloride, aluminum acetate, aluminum hydroxide, calcium hydroxide, ferrous sulfate, ferric chloride, Cupric chloride, zinc sulfate, lead acetate, barium chloride, and the like can be used. The pattern formed body comprising the aggregates thus obtained has good water dispersibility and can be uniformly dispersed in the stock material. Therefore, the pattern formed body is incorporated into the base paper as a means for providing the pattern formed body. When the method is employed, it becomes easy to randomly disperse the pattern forming body on the surface of the base paper.

  In the present invention, when the pattern forming body is made on the base paper, the blending amount of the pattern forming body is in the range of 0.2 to 5 parts by mass with respect to the entire base paper layer containing the pattern forming body. Is preferred. If the blending amount of the pattern forming body is less than 0.2 parts by weight, the visibility of the pattern may not be sufficiently obtained. Conversely, if the blending amount of the pattern forming body exceeds 5 parts by weight, the base paper is used. There is a risk that the layer strength will be weakened, and paper peeling may occur in the printing process, or the pattern-formed body may fall off the paper layer during cutting.

  Next, the configuration of the inkjet ink receiving layer will be described. As described above, since the pattern formed body is visually recognized as a pattern of the base paper by being exposed on the surface of the base paper, the inkjet ink having low transmittance on the surface of the base paper on which the pattern is exposed. When the receiving layer is provided, the ink-jet ink receiving layer hides the pattern on the surface of the base paper, resulting in poor pattern visibility.

  Therefore, the ink jet recording pattern paper of the present invention is configured such that an ink jet ink receiving layer having a total light transmittance of 90% or more in JIS K 7105: 1981 is provided on the base paper. If the total light transmittance is less than 90%, the pattern formed body is concealed by the ink-jet ink receiving layer having poor transparency, and the visibility of the pattern is impaired. From the viewpoint of further improving the visibility of the pattern, it is preferable that the total light transmittance of the ink-jet ink receiving layer is 94% or more. In particular, when the pattern forming body contains a glittering substance, glossiness is required. It is also desirable from the viewpoint of improving the visibility.

  By using such an ink-jet ink receiving layer, a pattern paper for ink-jet recording having excellent pattern visibility and no loss of gloss when the pattern-forming body contains a glittering substance and having ink-jet printing suitability is obtained. be able to.

  In the present invention, the total light transmittance in JIS K 7105: 1981 of the ink-jet ink receiving layer should be 90% or more to ensure the visibility of the pattern, while satisfying the ink-jet recording suitability. In order to satisfy the ink jet recording suitability, the ink jet ink receiving layer is required to have high ink absorbability. There are various methods for imparting high ink absorptivity to the ink-jet ink receiving layer, but it is easy to use a method of incorporating an inorganic pigment effective in improving ink absorptivity in the ink-jet ink receiving layer because of its high effect. .

  However, when an inorganic pigment is blended in the ink-jet ink receiving layer, the ink absorbency increases as the blending amount increases, but on the other hand, the transparency of the ink-jet ink receiving layer tends to decrease. Since the transmittance is low, the visibility of the pattern is likely to be impaired.

  That is, in the ink-jet ink receiving layer containing the inorganic pigment, the properties that increase the ink absorptivity and the total light transmittance are seemingly contradictory properties, and it has been considered difficult to satisfy both properties.

  The inventors of the present invention have conducted extensive research on this point, and as a result, there are two seemingly contradictory properties of increasing the ink absorption and the total light transmittance by blending a certain amount of a specific pigment into the ink-jet ink receiving layer. It has been found that can be satisfied at the same time.

  Based on the above knowledge, in the patterned paper for ink jet recording of the present invention, as the inorganic pigment to be contained in the ink jet ink receiving layer, a secondary inorganic particle having a volume average particle diameter of 500 nm or less is contained, and the fine particle The proportion of the inorganic pigment in the ink-jet ink receiving layer is 50 to 80% by mass. In this way, it is important to blend a specific amount of an inorganic pigment having a specific particle diameter in order to achieve both the ink absorptivity and the property of increasing the total light transmittance.

On the other hand, when an inorganic pigment having a volume average particle diameter of secondary particles exceeding 500 nm is contained in the above range, the transparency of the ink-jet ink receiving layer is impaired, resulting in a total light transmittance of 90%. It becomes difficult to do it above. As the fine inorganic pigment used in the present invention, the finer the particle diameter, the more transparent the ink-jet ink receiving layer can be made, and from this, the fine particle inorganic pigment whose secondary particles have a volume average particle diameter of 300 nm or less. It is more preferable to use
If the proportion of the fine inorganic pigment in the inkjet ink receiving layer is less than 50% by mass, the transparency of the inkjet ink receiving layer can be secured, but the ink absorbability cannot be satisfied. On the other hand, if the proportion of fine inorganic pigment exceeds 80% by mass, the ink absorbability can be satisfied, but the transparency of the ink-jet ink receiving layer tends to be impaired. Furthermore, fine inorganic particles are used in processing steps such as printing and cutting. This will cause problems such as pigment dropping off.

  In the present invention, in addition to the above configuration, it is also possible to use an inorganic pigment whose secondary particles have a volume average particle diameter of more than 500 nm. That is, as the inorganic pigment, a fine inorganic pigment and an inorganic pigment having a relatively large particle size are used in combination. By including an inorganic pigment having a relatively large particle size in the ink-jet ink receiving layer, it is possible to improve paper transportability in the ink-jet printer. This is probably because the inorganic pigment having a relatively large particle size functions as a spacer, and as a result, contributes to the reduction of the friction coefficient on the surface of the inkjet ink receiving layer. However, on the other hand, if an inorganic pigment having a volume average particle diameter of secondary particles exceeding 500 nm is used, the transparency of the ink-jet ink receiving layer tends to be impaired, and it becomes difficult to achieve a total light transmittance of 90% or more. The amount used must be kept small.

  In the present invention, it is preferable to use a synthetic amorphous silica whose secondary particles have a volume average particle diameter of 5 to 20 μm as the inorganic pigment having a volume average particle diameter of more than 500 nm. Synthetic amorphous silica has a light-transmitting property and a light-diffusing property, so that if used in a small amount, the transparency of the ink-jet ink receiving layer is hardly impaired, and further, the ink-jet ink absorbability is excellent. It can be suitably used as an inorganic pigment that functions as a spacer. The synthetic amorphous silica preferably has a volume average particle size of secondary particles of 8 to 16 μm, more preferably 10 to 15 μm. If the volume average particle diameter of the secondary particles is less than 5 μm, it is difficult to obtain the effect of reducing the friction coefficient on the surface of the inkjet ink receiving layer. On the other hand, if the volume average particle diameter of the secondary particles exceeds 20 μm, the transparency of the ink-jet ink receiving layer tends to be impaired, and it becomes difficult to make the total light transmittance 90% or more.

  In the present invention, the amount of the synthetic amorphous silica in which the volume average particle diameter of the secondary particles is 5 to 20 μm is preferably in the range of 1 to 12% by mass in the inkjet ink receiving layer. A range of 3 to 10% by mass is more preferable. If the blending amount is less than 1% by mass, it is difficult to obtain the effect of reducing the friction coefficient on the surface of the inkjet ink receiving layer. Conversely, if the blending amount exceeds 12% by mass, the transparency of the inkjet ink receiving layer tends to be impaired, and the total light transmittance is 90%. % Or more becomes difficult.

  When synthetic amorphous silica having a volume average particle diameter of secondary particles of 5 to 20 μm is used, the total light transmittance in JIS K 7105: 1981 of the ink-jet ink receiving layer should not be less than 90%. It is necessary to adjust the blending ratio with the fine inorganic pigment. That is, when a relatively large amount of secondary particles having a relatively large volume average particle diameter is blended as the synthetic amorphous silica, the transparency of the ink-jet ink receiving layer tends to be impaired. It is necessary to reduce the blending ratio of the inorganic pigment and ensure the transparency of the inkjet ink receiving layer.

  An example is given to the last, but as a specific example, when the synthetic amorphous silica whose secondary particles have a volume average particle diameter of 20 μm is blended in an amount of 12% by mass in the inkjet ink receiving layer, the inkjet ink receiving The proportion of the fine inorganic pigment in the layer is preferably 60% by mass or less.

  As another specific example, when synthetic amorphous silica having a volume average particle diameter of secondary particles of 12 μm is blended in an amount of 8% by mass in the inkjet ink receiving layer, it occupies the inkjet ink receiving layer. The blending ratio of the fine inorganic pigment is preferably 75% by mass or less.

  By adjusting the blending ratio of the fine inorganic pigment in this way, the transparency of the ink-jet ink receiving layer can be obtained even when synthetic amorphous silica having a volume average particle diameter of secondary particles of 5 to 20 μm is used. The total light transmittance in JIS K 7105: 1981 can be made 90% or more.

  In the present invention, the fine inorganic pigment is preferably an inorganic pigment selected from synthetic amorphous silica, alumina, and alumina hydrate. Each of these may be used alone or in combination of two or more. By using these inorganic pigments as finely divided inorganic pigments, an ink-jet ink receiving layer having better ink absorbability can be obtained.

  Synthetic amorphous silica can be broadly classified into wet method silica, gas phase method silica, and others depending on the production method, and wet method silica is further classified into precipitation method silica, gel method silica, and sol method depending on the production method. Classified as silica. In the present invention, any synthetic amorphous silica can be used as a fine inorganic pigment.

  Precipitated silica is produced by reacting sodium silicate and sulfuric acid under alkaline conditions. The silica particles that have grown are agglomerated and settled, followed by filtration, washing with water, drying, pulverization, and classification. . As specific examples of the precipitated silica, for example, “Toc Seal” manufactured by Tokuyama Corporation, “Nip Seal” manufactured by Tosoh Silica Co., Ltd. are commercially available.

  Gel silica is produced by reacting sodium silicate and sulfuric acid under acidic conditions. During the aging, the fine particles dissolve and reprecipitate so as to bond the other primary particles, so that the distinct primary particles disappear and relatively hard aggregated particles having an internal void structure are formed. Specific examples of gel method silica include “Carplex” manufactured by Evonik Degussa Japan Co., Ltd., “Nipgel” manufactured by Tosoh Silica Co., Ltd., “Syloid” manufactured by Grace Japan Co., Ltd., “Silojet”, etc. Is commercially available.

  The sol method silica is also referred to as colloidal silica, and is obtained by metathesis by an acid such as sodium silicate or by heating and aging a silica sol obtained through an ion exchange resin layer. Specific examples of the sol method silica include “Snowtex” manufactured by Nissan Chemical Industries, “Silica Doll” manufactured by Nippon Chemical Industry Co., Ltd., and the like.

  Vapor phase silica is also called a dry method as opposed to a wet method, and is generally made by a flame hydrolysis method. Specifically, a method of making silicon tetrachloride by burning with hydrogen and oxygen is generally known, but silanes such as methyltrichlorosilane and trichlorosilane can be used alone or tetrachlorosilane instead of silicon tetrachloride. It can be used in a mixed state with silicon. Examples of gas phase silica with secondary particles having a volume average particle diameter of 500 nm or less include “Aerosil” manufactured by Nippon Aerosil Co., Ltd., “Leosil” manufactured by Tokuyama Co., Ltd., manufactured by Cabot Corporation. “PG022”, etc. are commercially available.

  In addition, in the present invention, in addition to selecting and using secondary silica having a volume average particle diameter of 500 nm or less among commercially available various silicas, the above-mentioned commercial products are used in a bead mill, a ball mill, a collision grinder (water It is also possible to adjust the secondary particles to have a volume average particle diameter of 500 nm or less by pulverization with a wet pulverizer such as a jet mill.

  The alumina that can be blended as the fine inorganic pigment may be obtained by any method, but θ-alumina or γ-alumina in which γ-alumina or the like is a γ-type crystal of aluminum oxide is preferable. As alumina whose volume average particle diameter of secondary particles is 500 nm or less, for example, “AEROXIDE Alu C” “W630” manufactured by Evonik Degussa, “PG003” “PG008” manufactured by Cabot Corporation, and the like are commercially available.

The alumina hydrate which can be blended as the fine inorganic pigment is represented by a constitutional formula of Al ₂ O ₃ .nH ₂ O (n = 1 to 3). The case where n is 1 represents an alumina hydrate having a boehmite structure, and the case where n is greater than 1 and less than 3 represents an alumina hydrate having a pseudo boehmite structure. Such an alumina hydrate is obtained by a known production method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, hydrolysis of aluminate, etc. Examples of those having an average particle diameter of 500 nm or less include “DISPERAL HP 14” manufactured by SASOL.

  In addition, when blending the above gas phase method silica, alumina, and alumina hydrate in the ink-jet ink receiving layer, the form of a dispersion dispersed by a known dispersant such as acetic acid, lactic acid, formic acid, nitric acid These dispersion liquids may be used alone or in combination of two or more.

  In the present invention, the binder contained in the ink-jet ink receiving layer is not particularly limited, and can be appropriately selected within a range not impairing the intended effect of the present invention. For example, polyvinyl alcohol derivatives such as polyvinyl alcohol (PVA), carboxy-modified polyvinyl alcohol, and silanol-modified polyvinyl alcohol, starch derivatives such as starch, cationized starch, oxidized starch, and grafted starch, carboxymethyl cellulose, hydroxy Cellulose derivatives such as methyl cellulose, hydroxyethyl cellulose, cellulose sulfate, gelatin, casein, soybean protein, sodium polyacrylate, sodium styrene-maleic anhydride copolymer, sodium polystyrene sulfonate, maleic anhydride resin, polyvinyl pyrrolidone, polyethylene oxide , Etc. can be used in combination of one or more selected from.

  In the present invention, among these water-soluble polymer resins, it is preferable to contain any one of polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, and carboxymethyl cellulose as a binder. When these water-soluble polymer resins are contained as a binder, the ink swells and absorbs ink when ink jet recording is performed, so that an ink jet ink receiving layer having higher ink absorbability can be obtained. Image quality can be improved.

  In the present invention, a water-soluble polymer resin and other resins can be used in combination as a binder. The resin used in combination with the water-soluble polymer resin is preferably a hydrophilic resin, for example, ethylene-vinyl acetate copolymer (EVA), polyethylene, polyurethane, polyacrylic acid copolymer, polyacrylamide, styrene-butadiene copolymer. A polymer etc. are mentioned.

  In the present invention, in order to improve the fixability and color developability of the inkjet ink, the inkjet ink receiving layer may further contain an ink fixing agent mainly composed of a cationic polymer. Moreover, a well-known additive can be used for an inkjet ink receiving layer in the range which does not impair the effect made into the objective of this invention. For example, dispersing agents, antifoaming agents, pH adjusting agents, wetting agents, thickeners, crosslinking agents, preservatives, softeners, antistatic agents, antistatic agents, water resistance agents, plasticizers, fluorescent whitening agents, coloring Various additives such as pigments, coloring dyes, antioxidants, fragrances, lubricants and waxes can be used.

  Further, in providing the ink jet ink receiving layer on the base paper, it can be provided by coating the base paper with a coating liquid to be the ink jet ink receiving layer, but the coating method is not particularly limited, A coating method using a general coater such as an air knife coater, roll coater, blade coater, rod coater, bar coater, or die coater can be used. The drying method after coating is not particularly limited, and general drying methods such as hot air drying, infrared drying, and drum drying can be used.

  In the present invention, a calendar process may be performed as necessary for the purpose of controlling the smoothness of the pattern paper provided with the inkjet ink receiving layer. The calendar processing method is not particularly limited, and general calendar processing such as super calendar, machine calendar, and soft calendar can be performed. Further, post-processing treatments according to various product appearances such as embossing, drilling, and back surface tacking may be performed.

  Further, the outermost layer of the ink-jet ink receiving layer may be a gloss layer by a cast coating method. As the cast coating method, a known method such as a wet method, a coagulation method, or a rewet method can be selected. Furthermore, you may perform a calendar process on the surface of a glossy layer. The calendar process can be processed by a known process such as a super calender, a raster press, or a high temperature soft nip calender.

  The coating amount of the inkjet ink receiving layer on the base paper is not particularly limited, and may be set as appropriate so that both the transparency (total light transmittance) and the ink absorbency of the inkjet ink receiving layer can be satisfied. Good.

  As described above, in the pattern paper for ink jet recording of the present invention, the fine particle inorganic pigment is contained in the ink jet ink receiving layer in a proportion of 50 to 80% by mass in the ink jet ink receiving layer, but the content of the fine inorganic pigment is large. As the ink-jet ink receiving layer becomes less transparent, the ink absorbency tends to be higher. Similarly, the ink-jet ink receiving layer tends to have lower transparency and higher ink absorbability as the coating amount increases. Therefore, when the content ratio of the fine inorganic pigment in the ink-jet ink receiving layer is large, the ink absorbability is easily satisfied, but the transparency of the ink-jet ink receiving layer is easily impaired, so the coating amount can be set relatively small. On the contrary, when the content ratio of the fine inorganic pigment in the ink-jet ink receiving layer is small, the transparency of the ink-jet ink receiving layer is easy to ensure, but the ink absorbability is easily impaired, so the coating amount should be set relatively large. Is preferred.

Specifically, in the present invention, the coating amount of the inkjet ink receiving layer is preferably set in the range of ^{3 to} 15 g / m ² . If the coating amount is less than 3 g / m ² , ink jet recording suitability may not be satisfied. If the coating amount exceeds 15 g / m ² , the transparency of the ink jet ink receiving layer tends to be lowered, resulting in a decrease in total light transmittance. There is a possibility that it may be difficult to make the ratio 90% or more.

  Of course, even if the content ratio of the fine inorganic pigment in the ink-jet ink receiving layer is the same, by using the fine inorganic pigment that is more effective in improving the ink absorbability, the coating amount can be reduced while satisfying the ink absorbability. It is possible to increase the coating amount while satisfying the transparency (total light transmittance) of the ink-jet ink receiving layer by using finer inorganic pigments with finer particle diameters. is there.

Further, the basis weight of the pattern paper for ink jet recording according to the present invention is not particularly limited, and may be appropriately selected within a range applicable to an ink jet printer for performing printing, but preferably 50 to 300 g / m ² . It is a range.

  Examples of the pattern paper for ink-jet recording according to the present invention will be specifically described below, but the present invention is not limited thereby. Moreover, unless otherwise indicated, the part and% in an Example show a dry mass part and mass%.

(Create pattern formation)
Sodium carboxymethylcellulose aqueous solution (cellogen 3H (average molecular weight 220,000): manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 1200 kg as sodium carboxymethylcellulose, pearlescent pigment (Iriodin 305: manufactured by Merck) 3 as a glittering substance .2 kg, 3.0 kg of powdered cellulose fiber (KC Flock W-50S: manufactured by Nippon Paper Chemical Co., Ltd.) as a cellulose fiber was uniformly stirred in a 2000 liter tank to obtain a mixed solution. Next, 50 kg of 10% strength sulfuric acid band (manufactured by Techno Hokuetsu Co., Ltd.) was added as a metal salt while stirring the obtained mixed solution to obtain a slurry of a pattern forming body.

(Adjustment of papermaking raw material A)
Canadian standard freeness 500ml CSF 1.2% L-BKP pulp slurry 100 parts (converted to absolute dry pulp), cationic starch (trade name Neotac 40T: made by NSC Japan), talc (product) Meitaira Talc: manufactured by Taihei Talc Co., Ltd.) 5.0 parts, acidic rosin sizing agent (trade name AL1200: manufactured by Seiko PMC Co., Ltd.) 0.4 parts, and liquid sulfuric acid band (Techno Hokuetsu Co., Ltd.) 1.0 parts 4.0 parts by mass of the slurry of the pattern forming body was added to the paper stock prepared by addition to obtain a papermaking raw material A.

(Adjustment of papermaking raw material B)
In the preparation of the papermaking raw material A, a papermaking raw material B was obtained in the same manner as the preparation of the papermaking raw material A, except that the pattern forming body was not added.

(Creation of base paper A)
Using the papermaking raw material A, paper was made with a long net paper machine at a basis weight of 120 g / m ² to obtain a single-layer base paper A. As for the obtained base paper A, the pattern formation body which appeared on both surfaces of the base paper was recognized.

(Creation of base paper B)
Using a vat-type multi-layer paper machine, the first layer is made of papermaking raw material A with a basis weight of 15 g / m ² , the second layer is made of papermaking raw material B with a basis weight of 105 g / m ² , and the total basis weight is 120 g / m ^2. A two-layer base paper B of m ² was obtained. Here, the outer surface of the first layer is referred to as “front surface”, and the outer surface of the second layer is referred to as “back surface”. Hereinafter, the same applies to any examples and comparative examples using the base paper B. As for the obtained base paper B, the exposed pattern forming body was recognized on the surface, and the pattern forming body was not recognized on the back surface.

Example 1
Synthetic amorphous silica (FPS-101 (manufacturer catalog particle size 1.6 μm): Evonik Degussa Japan Co., Ltd.) as a fine inorganic pigment is pulverized with a collision pulverizer HJP-25005 (manufactured by Sugino Machine), and secondary particles 100 parts by mass of synthetic amorphous silica having a volume average particle diameter of 500 nm, 8 parts by mass of a cationic resin (Unisense CP-102: manufactured by Senca) as an ink fixing agent, and polyvinylpyrrolidone (K-85W: Japan) as a binder 50 parts by mass of Catalyst Co., Ltd.) was added to water and mixed and stirred to obtain an ink-jet ink receiving layer coating solution having a solid concentration of 14%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Example 2)
The volume average particle diameter of secondary particles as a fine inorganic pigment is 150 nm, 50 parts by mass of θ, γ, δ type composite alumina (PG003: manufactured by Cabot Corporation), and the volume average particle diameter of secondary particles as a fine inorganic pigment is the same. Gas phase method silica (PG022A: manufactured by Cabot Corporation) having a thickness of 150 nm, cationic resin (Unisense CP-102: manufactured by Senca) as an ink fixing agent, and polyvinyl alcohol (PVA124: manufactured by Kuraray Co., Ltd.) as a binder. ) 17.5 parts by mass of water was added and mixed and stirred to obtain a coating liquid for inkjet ink receiving layer having a solid content of 14%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Example 3)
In Example 2, a pattern paper for inkjet recording was obtained in the same manner as in Example 2 except that the blending amount of polyvinyl alcohol as a binder was changed from 17.5 parts by mass to 92 parts by mass.

Example 4
100 parts by mass of gas phase method silica (PG022A: manufactured by Cabot Corporation) in which the volume average particle diameter of secondary particles is 150 nm as an inorganic pigment, and 8 cationic resins (Unisense CP-102: manufactured by Senka) as an ink fixing agent. 92 parts by mass of polyvinyl alcohol (PVA124 / manufactured by Kuraray Co., Ltd.) as a part by mass and a binder were added to water and mixed and stirred to obtain an ink-jet ink receiving layer coating liquid having a solid content concentration of 12.5%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Example 5)
In Example 2, a pattern paper for inkjet recording was obtained in the same manner as in Example 2 except that the blending amount of polyvinyl alcohol as a binder was changed from 17.5 parts by mass to 45 parts by mass.

(Example 6)
In Example 4, the pattern paper for inkjet recording was obtained like Example 4 except having changed the compounding quantity of polyvinyl alcohol which is a binder from 92 mass parts to 45 mass parts.

(Example 7)
In Example 6, 100 parts by mass of vapor phase method silica, which is a fine inorganic pigment, 100 parts by mass of pearl necklace-shaped colloidal silica slurry (PS-SO: manufactured by Nissan Chemical Co., Ltd.) whose secondary particles have a volume average particle diameter of 150 to 200 nm. A pattern paper for ink-jet recording was obtained in the same manner as in Example 6 except for changing the part.

(Example 8)
In Example 2, the amount of the polyvinyl alcohol is a binder was changed to 45 parts by weight 17.5 parts by weight, the coating amount of the inkjet ink-receiving layer in solid content from 4g / m ² and 7 g / m ² A pattern paper for ink-jet recording was obtained in the same manner as in Example 2 except for the change.

Example 9
In Example 4, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 7 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 4.

(Example 10)
In Example 1, the amount of polyvinylpyrrolidone is binder was changed to 17.5 parts and 50 parts, and the coating amount of the ink-jet ink receptive layer on a solid basis from 4g / m ² to 12 g / m ² A pattern paper for ink jet recording was obtained in the same manner as in Example 1 except for the change.

(Example 11)
In Example 2, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 3 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 2.

(Example 12)
In Example 2, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 15 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 2.

(Example 13)
In Example 4, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 3 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 4.

(Example 14)
In Example 4, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 15 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 4.

(Example 15)
Example 2 is the same as Example 2 except that the base paper A is changed to the base paper B and the surface of the base paper B is coated with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Thus, a pattern paper for inkjet recording was obtained.

(Example 16)
In Example 4, the base paper used was changed from base paper A to base paper B, and the inkjet ink receiving layer was coated on the surface of base paper B with a coating rod so that the coating amount was 4 g / m ^{2 in} solid content. A pattern paper for inkjet recording was obtained in the same manner as in Example 4 except that the processing was performed.

(Example 17)
In Example 1, a synthetic amorphous silica (FPS-101 (manufacturer catalog particle size 1.6 μm): manufactured by Evonik Degussa Japan), which is a fine inorganic pigment, is pulverized by a collision pulverizer HJP-25005 (manufactured by Sugino Machine). And the pattern paper for inkjet recording was obtained like Example 1 except having used the volume average particle diameter of the secondary particle as 300 nm.

(Example 18)
A pattern paper for inkjet recording was obtained in the same manner as in Example 7, except that sodium carboxymethyl cellulose (Selogen 7A: manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used as the polyvinyl alcohol as the binder in Example 7.

(Example 19)
Θ, γ, δ type composite alumina (PG003: manufactured by Cabot Corporation) whose secondary particles have a volume average particle diameter of 150 nm as a fine inorganic pigment, and cationic resin (Unisense CP-102: Senca) as an ink fixing agent 8 parts by mass) Casein (ALACID LACTIC CASEIN: manufactured by Fonterra) as a binder was added to water and mixed and stirred to obtain a coating solution for an inkjet ink receiving layer having a solid content concentration of 14%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Example 20)
90 parts by mass of θ, γ, and δ type composite alumina (PG003: manufactured by Cabot Corporation) whose secondary particles have a volume average particle diameter of 150 nm as a fine inorganic pigment, and synthetic particles whose secondary particles have a volume average particle diameter of 15 μm 10 parts by mass of crystalline silica (Nipgel BY-001: manufactured by Tosoh Silica), 8 parts by mass of a cationic resin (Unisense CP-102: manufactured by Senka) as an ink fixing agent, and polyvinyl alcohol (PVA124: manufactured by Kuraray Co., Ltd.) as a binder. ) 20 parts by mass was added to water and mixed and stirred to obtain a coating liquid for inkjet ink receiving layer having a solid content of 14%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Comparative Example 1)
As a binder, polyvinyl pyrrolidone (K-85W: manufactured by Nippon Shokubai Co., Ltd.) was added to water and stirred to obtain a coating liquid for inkjet ink receiving layer having a solid content concentration of 14%. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Comparative Example 2)
In Example 1, synthetic amorphous silica (Nipgel AZ6A0 (manufacturer catalog particle size 4 μm): manufactured by Tosoh Silica), which is a fine inorganic pigment, is used as it is without being pulverized by a collision pulverizer HJP-25005 (manufactured by Sugino Machine). A pattern paper for inkjet recording was obtained in the same manner as in Example 1 except that.

(Comparative Example 3)
100 parts by mass of calcium carbonate having an average particle size of 3.3 μm as an inorganic pigment (Shiraka Hana PZ: manufactured by Shiraishi Kogyo Co., Ltd.) and 45 parts by mass of polyvinyl alcohol (PVA124: manufactured by Kuraray Co., Ltd.) as a binder are added to water and mixed. A coating solution for an ink-jet ink receiving layer having a solid content concentration of 14% was obtained. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got. The average particle size was measured by a laser diffraction method using Microtrac 7320-X100 (HoneyWell).

(Comparative Example 4)
Synthetic amorphous silica (nip gel AZ6A0 (manufacturer catalog particle size 4 μm): manufactured by Tosoh Silica Corp.) 50 parts by mass as inorganic pigment, and synthetic amorphous silica (thyroid 74 × 5500 (manufacturer catalog particle size 9 μm)): Grace 50 parts by weight, 8 parts by weight of a cationic resin (Unisense CP-102 / Senka) as an ink fixing agent, and 45 parts by weight of polyvinyl alcohol (PVA124 / manufactured by Kuraray) as a binder are added to water and mixed and stirred. A coating solution for an inkjet ink receiving layer having a solid concentration of 14% was obtained. The obtained ink-jet ink receiving layer coating solution is applied to one surface of the base paper A with a coating rod so that the coating amount is 4 g / m ² in terms of solid content. Got.

(Comparative Example 5)
In Example 1, a pattern paper for inkjet recording was obtained in the same manner as in Example 1 except that the blending amount of polyvinyl pyrrolidone as a binder was changed from 50 parts by mass to 7.5 parts by mass.

(Comparative Example 6)
In Example 2, a pattern paper for inkjet recording was obtained in the same manner as in Example 2 except that the blending amount of polyvinyl alcohol as a binder was changed from 17.5 parts by mass to 150 parts by mass.

(Comparative Example 7)
In Example 1, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 18 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 1.

(Comparative Example 8)
In Example 2, to obtain an ink jet recording pattern paper was changed from 4g / m ² to 25 g / m ² by solid content coating amount of the inkjet ink-receiving layer in the same manner as in Example 2.

  The evaluation result of the pattern paper for inkjet recording obtained in Examples 1-20 and Comparative Examples 1-8 is shown in FIG. Each evaluation method and evaluation criteria are as follows.

"Inkjet recording suitability"
Using a commercially available full-color inkjet printer (EP-801A: manufactured by Seiko Epson Corporation), a photographic image is printed on the surface provided with the inkjet ink receiving layer of the pattern paper for inkjet recording obtained in each Example and Comparative Example, Inkjet recording suitability was evaluated. The evaluation of ink jet printing suitability was comprehensively judged according to the following procedure by visually confirming the print bleeding and color density at the boundary of the photographic image.
A: Very good (practical level)
○: Good (practical level)
○ △: Yes (practical lower limit level)
Δ: Slightly bad (unsuitable for practical use)
×: Defect (unsuitable for practical use)

"Measurement of total light transmittance of inkjet ink receiving layer"
According to JIS K7105: 1981, the total light transmittance of the inkjet ink receiving layer was measured by the following procedure using a color / turbidity simultaneous measuring device (COH400: manufactured by Nippon Denshoku). The amount of coating on the surface of the polyethylene terephthalate film (Chrisper A4300: manufactured by Toyobo Co., Ltd.) applied to the base paper in each example and comparative example, with the coating liquid for inkjet ink receiving layer used in each example and comparative example. It applied so that it might become the same quantity, and it was made to dry and the coating layer was formed, and the sample for evaluation corresponding to each Example and a comparative example was obtained. Next, the transmitted light amount of only the polyethylene terephthalate film was measured using a color / turbidity simultaneous measuring device, and the transmitted light amount of the sample for evaluation in which an inkjet ink receiving layer was provided on the polyethylene terephthalate film was also measured. The total light transmittance was calculated from the following equation (1).
Formula 1: Tt (%) = (T2 / T1) × 100
Tt: Total light transmittance of ink-jet ink receiving layer (%)
T1: Transmitted light amount of only polyethylene terephthalate film T2: Transmitted light amount of polyethylene terephthalate film + inkjet ink receiving layer

Moreover, the value measured with the following method was used about the average particle diameter of the inorganic pigment contained in the inkjet ink receiving layer used by each Example and the comparative example.
For nm order: Dynamic light scattering method For μm order: Laser diffraction method

  As is clear from the results shown in FIG. 1, all of the ink jet recording pattern papers obtained in Examples 1 to 20 had a practical level of ink jet recording suitability. In addition, since the total light transmittance of the ink-jet ink receiving layer is 90% or more in any ink-jet recording pattern paper, the pattern formed body has good visibility and satisfies the design as a pattern paper. there were.

  In addition, the ink jet recording pattern paper obtained in Example 20 has excellent transportability in an ink jet printer by including a relatively large particle size synthetic amorphous silica in the ink jet ink receiving layer. there were.

  In contrast, the pattern paper for ink jet recording obtained in Comparative Example 1 did not contain an inorganic pigment in the ink jet ink receiving layer, so that the total light transmittance was high, but it was poor in ink jet recording suitability and practical. It could not be provided.

  In addition, the pattern paper for inkjet recording obtained by Comparative Examples 2 to 4 was remarkably inferior in total light transmittance because the inorganic pigment having a relatively large average particle diameter was blended in the inkjet ink receiving layer, and the pattern formed body was The visibility was poor, and the design as a pattern paper was not satisfied.

  Further, the pattern paper for inkjet recording obtained in Comparative Example 5 had a relatively large proportion of fine inorganic pigment in the inkjet ink receiving layer, and thus the total light transmittance was slightly but less than 90%. . For this reason, the pattern paper for inkjet recording obtained by this comparative example has poor visibility of a pattern formation body, and did not satisfy the designability as a pattern paper.

  Further, the pattern paper for ink jet recording obtained in Comparative Example 6 had a relatively small proportion of inorganic pigment in the ink jet ink receiving layer, so that the ink absorbability was inferior and practical ink jet recording suitability could not be obtained.

  Moreover, since the inkjet recording paper obtained by the comparative example 7 and the comparative example 8 made the coating amount of the inkjet ink receiving layer comparatively large, the total light transmittance was less than 90% and the visibility of a pattern formation body was bad. Therefore, it did not satisfy the design as a pattern paper.

  The pattern paper for ink-jet recording according to the present invention is suitable as a packaging material, a decorative box, and a postcard paper because of its texture and ink-jet printability. In particular, by engraving a pattern-formed body having a glitter, it becomes preferable as a greeting card for seasonal greetings such as gift boxes and gift boxes.

  In addition, when using the pattern paper for inkjet recording according to the present invention as a postcard paper, a pattern forming body may be used so that the pattern is exposed on both the front and back surfaces, but the pattern is formed only on one of the surfaces. In such a case, it is desirable that the surface side where the pattern is not provided is the address surface and the surface side where the pattern is provided is the communication surface. By configuring in this way, the address surface is a plain paper with no pattern, and the postal code, address, address, etc. are easy to read, and the communication surface has a high design property in addition to the pattern, and an excellent inkjet It can be used as a postcard paper that has printability and high commercial value.

  Further, by providing a gloss layer by the cast coating method on the ink-jet ink receiving layer, it is possible to express a photographic-like high-definition image, and further improve the commercial value.

Claims (7)

An ink-jet ink receiving layer containing an inorganic pigment and a binder is provided on the base paper containing the pattern forming body,
The base paper has pulp as a main component, and a pattern forming body is exposed on at least one surface,
The inkjet ink receiving layer is provided on at least one surface of the surface on which the pattern forming body of the base paper is exposed,
The inorganic pigment includes a fine inorganic pigment having a volume average particle diameter of secondary particles of 500 nm or less,
The proportion of the fine inorganic pigment in the inkjet ink receiving layer is 50 to 80% by mass,
A pattern paper for ink-jet recording, wherein the ink-jet ink receiving layer has a total light transmittance of 90% or more according to JIS K 7105: 1981.   2. The pattern paper for ink-jet recording according to claim 1, wherein the fine inorganic pigment contains at least one selected from synthetic amorphous silica, alumina, and alumina hydrate.   The pattern paper for inkjet recording according to claim 1 or 2, wherein the binder contains any one selected from polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, and carboxymethyl cellulose, or two or more thereof.   As the inorganic pigment, synthetic amorphous silica whose secondary particles have a volume average particle diameter of 5 to 20 μm is contained in a range of 1 to 12% by mass in the ink-jet ink receiving layer. The pattern paper for inkjet recording in any one of Claims 1-3.   The pattern paper for inkjet recording according to any one of claims 1 to 4, wherein the pattern forming body contains a glittering substance.   The ink jet recording according to any one of claims 1 to 5, wherein the pattern forming body is blended in an amount of 0.2 to 5 parts by mass with respect to the entire base paper layer containing the pattern forming body. Pattern paper. The ink-jet recording pattern paper according to any one of claims 1 to 6, wherein the coating amount of the ink-jet ink receiving layer is in the range of ³ to 15 g / m ² in terms of solid content.

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