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WO2006035661A1 - Papier d’impression a jet d’encre - Google Patents

Papier d’impression a jet d’encre Download PDF

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Publication number
WO2006035661A1
WO2006035661A1 PCT/JP2005/017461 JP2005017461W WO2006035661A1 WO 2006035661 A1 WO2006035661 A1 WO 2006035661A1 JP 2005017461 W JP2005017461 W JP 2005017461W WO 2006035661 A1 WO2006035661 A1 WO 2006035661A1
Authority
WO
WIPO (PCT)
Prior art keywords
calcium carbonate
light calcium
paper
silica
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2005/017461
Other languages
English (en)
Japanese (ja)
Inventor
Yujiro Fukuda
Dai Nagahara
Norifumi Tanaka
Ayano Takagi
Koichi Yanai
Yoshio Yoshida
Kohei Kurimoto
Masanori Kawashima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Original Assignee
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2004279578A external-priority patent/JP4496906B2/ja
Priority claimed from JP2004284661A external-priority patent/JP4213103B2/ja
Application filed by Nippon Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Nippon Paper Industries Co Ltd
Publication of WO2006035661A1 publication Critical patent/WO2006035661A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/506—Intermediate layers

Definitions

  • the present invention relates to an inkjet recording sheet.
  • the ink jet recording method is widely used with the rapid improvement of the printing performance due to the fact that full-coloring is easy and the printing noise is small!
  • the ink jet recording method has been widely used as a color printer in homes and offices because the device is compact and inexpensive.
  • the ink jet recording method ejects ink droplets toward recording paper such as nozzle force paper to form an image, and the recording paper and the printer do not come in direct contact with each other! is there.
  • the inkjet recording method is, for example, recording of a document created by document creation software, recording of a digital image such as a digital photograph, recording (replication) after a scanner prints a beautiful print such as a silver salt photograph or a book, etc. To be used. Then, an inkjet recording sheet having a configuration suitable for each of these applications has been proposed. For example, for simple document recording, plain paper type recording paper which is not coated on base paper is used.
  • a coating type provided with a thick coating layer as an ink receiving layer on a base paper is used, and in particular when the gloss is required, the above coating A cast type recording sheet prepared by cast coating a working layer is used (see, for example, Patent Documents 1 and 2).
  • a coating liquid containing a pigment and a binder as main components is coated on a base paper to form a coating layer to be an ink receiving layer, and the coating is wet and plasticized.
  • the work layer is pressed against a mirror-finished surface such as a cast drum to finish gloss.
  • the cast coating method is (1) wet cast method (direct method) in which the coated layer is pressed and dried on a mirror-finished heating drum while the coated layer is wet, and (2) the coated layer in the wet state is ) After being dried, it is swelled and plasticized with rewetting liquid, pressed onto mirror surfaced heating drum and dried, and re-wet method (re-wetting method), (3) the wet coating layer is made into gel state by coagulation treatment Generally divided into three types: Gelie cast method (solidification method), which is pressed and dried on a mirror-finished heating drum be able to.
  • the ink for inkjet recording contains a large amount of solvent in the ink to form stable droplets. Therefore, in order to obtain good image quality, it is necessary to rapidly absorb recording paper force S ink droplets.
  • ink-jet recording paper is required to have higher ink absorbency by the use of high-speed or multi-color ink in printers. Therefore, a recording sheet provided with the above-mentioned ink receiving layer on a support is covered.
  • the ink receiving layer is generally composed of a pigment which absorbs the ink, a binder which binds the pigment on the support, an ink fixing agent which fixes the ink to the ink receiving layer, and various auxiliary agents.
  • a pigment for the ink receiving layer synthetic amorphous silica excellent in ink absorbability and transparency is generally used, but various properties for improving printing quality and workability (particle size, Silica having an oil absorption etc. has been proposed as a pigment (see, for example, Non-Patent Document 1).
  • the average particle diameter is about 3 to 6 ⁇ m, and the oil absorption amount is 250 cm 3 Z100.
  • silicas 123 of the same reference
  • average particle diameter of 2 to 15 111 oil absorption of 180 ml
  • 100 g or more of silica pl46 of the same document
  • an ink jet recording sheet provided with an ink receiving layer is disclosed (see, for example, Patent Document 6).
  • an inkjet recording sheet capable of absorbing more ink is desired.
  • Such a force has been proposed to provide an under layer between the support and the ink receiving layer.
  • a technique of providing an under layer containing silica as a pigment in the lower layer of the ink receiving layer, or as an under layer pigment A technology using a mixture of silica and heavy calcium carbonate fine particles has been proposed (see Patents 7 and 8).
  • Patent Document 1 Japanese Patent Application Laid-Open No. 62-95285
  • Patent Document 2 Japanese Patent Application Laid-Open No. 5-59694
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2004-18336
  • Patent Document 4 Japanese Patent Application Laid-Open No. 2002-29739
  • Patent Document 5 Japanese Patent Application Laid-Open No. 10-226982
  • Patent Document 6 Japanese Patent Application Laid-Open No. 2003-170656
  • Patent Document 7 Japanese Patent Application Laid-Open No. 2003-260862
  • Patent Document 8 Japanese Patent Application Laid-Open No. 2003-285543
  • Non-patent document 1 "Development technology of ink 'media' printer in ink jet recording", 1st print, Issuer Kazuhiro Takathin, Inc. Technical Information Association, Inc., August 28, 2000 pl23, p 146
  • titanium oxide used to improve the opacity of paper itself is a relatively hard filler, and paper using titanium oxide tends to have a high density, so guillotine etc.
  • guillotine etc. There is a problem that when cutting is performed, the load on the cutting blade is large and chipping of the blade occurs, and cutting noise becomes extremely large.
  • a low specific gravity substance such as white carbon is used as a filler, the rigidity and size of the paper are lowered, and the opacity is lowered as compared with calcium carbonate and the like.
  • the under layer or the ink receiving layer thereon may be missing and the paper may get caught between the paper and the like. It occurs.
  • the paper surface may have irregularities such as depressions, which may impair the appearance, and is particularly remarkable in high-smooth cast paper.
  • an object of the present invention is to provide an ink jet recording sheet which is excellent in opacity and cutting processability, or higher in ink absorbability and sander strength.
  • the present inventors have found that by using a specific filler in paper, the opacity and cutting processability can be improved.
  • the above object of the present invention is an ink jet recording sheet provided with an ink receiving layer containing a pigment and a binder on a base paper, wherein the surface of the light calcium carbonate particles is made of silica in the base paper.
  • an ink jet recording sheet characterized in that it comprises a filler consisting of coated light calcium carbonate-silica composite particles.
  • the inventors have found that by using a specific filler in the under layer, it is possible to improve the ink absorbability and improve the under layer strength. . It is considered that this is because the pigment improves the balance of the absorption characteristics of the pigment and improves the ink absorption without adsorbing a large amount of the binder.
  • the above object of the present invention is an ink jet recording paper provided with an under layer containing a pigment and a binder on at least one surface of a support and an ink receiving layer provided on the surface of the under layer.
  • This is achieved by an ink jet recording sheet characterized in that the pigment of the under layer contains light calcium carbonate-silica composite particles coated with silica on the surface of light calcium carbonate particles.
  • the solid content mass ratio (CaCO 2 / SiO 2) of the light calcium carbonate Z silica in the light calcium carbonate-silica composite particles is 25Z75 to 75Z25.
  • the light calcium carbonate particles are secondary particles by aggregation of spindle-like primary particles.
  • it is a light rosette calcium carbonate calcium carbonate that forms a.
  • the outermost surface of the ink receiving layer is brought into pressure contact with the heated mirror surface while the surface of the coating layer formed by applying the coating material for the ink receiving layer is in a wet state, and then dried. It is preferable to be provided.
  • an ink jet recording sheet which is excellent in opacity and cutting processability, or higher in ink absorbency and sander strength.
  • An embodiment according to the first invention (containing light calcium carbonate / silica composite particles as a filler in base paper)
  • the ink jet recording paper of the embodiment according to the first invention of the present invention is provided with an ink receiving layer on a base paper, and contains the following light calcium carbonate / silica composite particles as a filler in the base paper.
  • the base paper used in the present embodiment contains pulp fibers and fillers as main components.
  • the type and blending amount of pulp used for the base paper are not particularly limited.
  • kraft pulp (a)
  • Chemical pulps such as KP), Stone Grand Pulp (SGP), Pressed Stone Grand Pulp (PG P), Refiner Grand Pulp (RGP), Chemi Grand Pulp (CGP), Thermo Grand Pulp (TGP), Ground Pulp (GP) Mechanical pulp (MP) such as Thermo-mechanic pulp (TMP), Chemotherme force-carp pulp (CTMP), Refiner-mechanic pulp (RMP), etc., and 1 or 2 from waste paper pulp such as deinked pulp (DIP)
  • TMP Thermo-mechanic pulp
  • CMP Chemotherme force-carp pulp
  • RMP Refiner-mechanic pulp
  • DIP deinked pulp
  • the species or more can be selected appropriately and used in combination.
  • light calcium carbonate-silica composite particles in which the surface of light calcium carbonate particles is coated with silica are used.
  • the composite particles are used as the whole or part of the filler in paper.
  • the light calcium carbonate-silica composite particles have, for example, a particle diameter of about 0.9 to 9 / ⁇ Silica (SiO 2) particles with a primary particle size of about 20 to 60 nm on the surface of light calcium carbonate
  • light calcium carbonate can be synthesized by, for example, calcining limestone and chemical reaction, but is not limited thereto.
  • the crystal form (homomorphous) of light calcium carbonate (CaCO 3) is calcite, aragona
  • the shape of the light calcium carbonate may be any of needle, column, spindle, sphere, cube, and rosette type.
  • the rosette type refers to a shape in which spindle-shaped light calcium carbonate primary particles are aggregated into a chestnut-like shape, and the specific surface area and oil absorption are higher than those of other forms.
  • it is preferable to use rosette type calcite-based light calcium carbonate since light calcium carbonate-silica composite particles excellent in the effect of improving bulkiness and opacity when internally added to a base paper can be obtained. Light carbonated calcium carbonate may be used after being crushed.
  • FIG. 1 is a SEM (electron microscope) image showing an example of the form of light calcium carbonate (Rosetta-type calcite system) in a dispersed state in a liquid
  • FIG. 2 shows the dispersed state in a liquid.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a SEM image which shows an example of the form of the light calcium calcium carbonate silica composite particle. According to FIG. 2, it can be seen that substantially spherical silica particles are bound (deposited) on the surface of light calcium carbonate. Also, in the example of FIG. 2, three composite particles are present. It is to be noted that the composite particles adhere to the surface of the knob fiber in a single or plural aggregated state after paper making.
  • the oil absorption can be increased, and the opacity of paper can be improved.
  • light calcium carbonate-silica composite particles are less likely to wear the blade when cutting the paper which has lower hardness than titanium.
  • the light calcium carbonate-silica composite particles are required to be contained in the paper, and preferably 1 to 25% by mass as the filler in the paper.
  • the filler content in the paper is less than 1% by mass, the opacity of the ink jet recording sheet is not improved, and when it exceeds 25% by mass, the paper strength is reduced, paper breaks are generated during paper making, and paper powder is generated during processing. It will be easier.
  • the filler content in the paper is more preferably 3 to 25% by mass, and most preferably 5 to 25% by mass. In addition, it can be measured by the ash content test method (525 ° C. combustion method) specified in the paper filler rate IS ISC P 8251. It is preferable that the solid content mass ratio (CaCO 2 / SiO 2) of the light calcium carbonate Z silica in the light calcium carbonate-silica composite particles is 25Z75 to 75Z25. The above ratio is
  • the solid content mass ratio can be determined, for example, by fluorescent X-ray analysis of light calcium carbonate-silica composite particles to quantify Ca and Si.
  • the average particle diameter force of the light calcium carbonate / silica composite particles is preferably 30 ⁇ m.
  • the average particle size of the composite particles is less than 1 ⁇ m, the retention of filler during papermaking may decrease.
  • the average particle size exceeds 30 m, the paper strength may decrease, the filler distribution in the paper may become uneven, and the formation may be deteriorated.
  • a more preferable average particle size is 3 to 20 ⁇ m, and a further preferable range is 3 to 10 ⁇ m.
  • the oil absorption of the light calcium carbonate-silica composite particles is preferably 70 to 300 ml Z100 g.
  • the oil absorption amount of the composite particles is less than 70 ml and less than 100 g, when the coating amount of the ink receiving layer is small, the ink absorptivity deteriorates and problems such as bleeding easily occur in the ink jet recorded image.
  • the oil absorption exceeds 300 ml Z100 g, other additives may be absorbed excessively at the time of sheet making, and the effects of the agent may be reduced. More preferable oil absorption is 100 to 200 ml Z 100 g.
  • the light calcium carbonate-silica composite particles have a BET specific surface area of 5 to 110 m 2 / g.
  • the BET specific surface area of the composite particles is less than 5 m 2 / g, the light scattering effect of the composite particles is reduced, so that the light scattering tends to be reduced and the opacity is reduced.
  • the BET specific surface area exceeds 110 m 2 Zg, other additive chemicals may be absorbed excessively at the time of paper making, and the effects of the chemicals may be reduced.
  • a more preferred BET specific surface area is 10 to 50 m 2 Zg.
  • the light calcium carbonate / silica composite particles contain light calcium carbonate inside, when making the paper by acid papermaking, the light calcium carbonate inside the particles may be decomposed or dissolved. Therefore, in the present invention, it is preferable to make the paper by neutral paper making or alkaline paper making. (3) Other effects of light calcium carbonate / silica composite particles
  • the present invention is effective when producing an inkjet recording sheet by a cast coating method. That is, in all of the cast coating methods, since it is necessary to press the coated layer against the cast drum to obtain a glossy surface, drying of the coated layer proceeds only from the side not in contact with the cast roll of the base paper. Therefore, the cast coating method can improve productivity by using a highly permeable base paper that has low drying speed and low productivity. Then, according to the present embodiment, the density of the base paper is reduced (the bulk is increased), and as a result, the air permeability of the base paper can be increased.
  • the bulkiness of the base paper it is preferable to set the bulkiness to 3% or more.
  • the higher the bulkiness rate the better the cast operability, but if the bulkiness rate is too high, the paper strength tends to decrease, and there is a tendency for paper breaking to occur at the time of base paper production. For this reason, it is preferable to set the bulkiness to 20% or less.
  • the bulk ratio is determined by measuring the density from the thickness and basis weight of the base paper before coating.
  • the light calcium carbonate-silica composite particles are prepared, for example, by adding a mineral acid to a mixture of light calcium carbonate and an aqueous solution of an alkaline metal silicate at a temperature not higher than the boiling temperature thereof. Obtained as 9. Incidentally, according to such a production method, it is considered that the surface of the light calcium carbonate will be a composite particle coated with silica.
  • the above-mentioned light calcium carbonate is dispersed in water.
  • the dispersion amount in water is preferably set to 1 to 20% by mass in terms of solid content in consideration of the influence of addition of caiic acid described later.
  • the dispersed amount is less than 1% by mass, the production amount per batch decreases, and when it exceeds 20% by mass, the dispersibility decreases, and an alkali caic acid used for the reaction with the light calcium carbonate amount
  • the viscosity of the reaction may increase and the operability S may decrease.
  • an alkaline solution of silicic acid for example, sodium or potassium
  • silicic acid for example, sodium or potassium
  • the solid content mass ratio (CaCO 2 / SiO 2) of the intended light calcium carbonate-silica composite particles can be adjusted by adjusting the feed mass ratio of the light calcium carbonate to the alkali solution of silicic acid.
  • the dispersion time, the strength of the agitation, etc. are not limited.
  • the reaction is neutralized with a mineral acid.
  • Mineral acids can be anything cheap, such as sulfuric acid and hydrochloric acid.
  • the mineral acid may contain an acidic metal salt such as a sulfuric acid band or magnesium sulfate.
  • the acid concentration should be at least 0.05 N, as the amount of the whole solution will increase if the acid concentration is low.
  • the acid concentration should be at least 0.05 N, as the amount of the whole solution will increase if the acid concentration is low.
  • the acid concentration becomes high, a low pH occurs in the solution due to the addition of acid, and light calcium carbonate is decomposed, so strong stirring is performed using a homomixer etc. at the addition port of acid. There is a need. Also, the acid addition may be performed several times.
  • a suspension in which the surface of the light calcium carbonate particles is coated with silica is obtained.
  • This suspension may be used as it is in the papermaking process, etc., but in the case of small scale production, filtration equipment such as filter paper or membrane filter is used, and in the case of medium scale or more, belt filter is used. And solid-liquid separation using filtration with a drum filter, etc., or centrifugation using a centrifuge, and removal of salts, which are by-products generated by neutralization reaction, is preferred. . If this salt remains, it may be converted to a poorly soluble metal salt (eg, calcium sulfate) in the papermaking process, which may cause scaling. Furthermore, the cake (usually having a solid concentration of 10 to 50%) subjected to solid-liquid separation may be re-dispersed with water or ethanol, and then solid-liquid separated again to further remove excess caiic acid or salt.
  • a poorly soluble metal salt eg, calcium sulfate
  • the adjustment of the average particle size of the light calcium carbonate-silica composite particles can be carried out by vigorously stirring or grinding during aging during the neutralization reaction, or after completion of the neutralization reaction, or after wet separation of solid / liquid separated after completion of the reaction. It can be carried out by crushing using a machine. You may combine these methods.
  • aging refers to temporarily suspending the addition of the acid to be added during neutralization and leaving it to be stirred only.
  • filler in addition to the light calcium carbonate-silica composite particles, other inorganic fillers and organic fillers may be used in combination as long as bulkiness, opacity, size and the like are not impaired.
  • fillers generally used in neutral papermaking and alkaline papermaking can be used without any limitation.
  • fillers fine particles of organic substances such as urea formalin resin, polystyrene resin, and phenol resin may be selected.
  • the content of the total filler in the paper (light calcium carbonate / silica composite particles alone, or the total of this and other fillers) in the paper is preferably 1 to 40% by mass in solid content 3 to 40 mass % Is more preferably 5 to 40% by mass. If the content exceeds 40% by mass, the number of cut sheets due to the decrease in paper strength may increase, and the operability may decrease and the amount of paper dust generated during printing may increase.
  • the content of these sizing agents is preferably from 0.1 to 1% by weight, preferably from 0.05 to 5% by weight, based on the absolute dry weight of the pulp.
  • a paper machine used for paper making of base paper known devices such as a Fourdrinier paper machine, an on-top twin wire paper machine, a gear former and the like can be used.
  • the surface may be coated on a base paper for the purpose of improving surface strength, imparting water resistance, and improving ink receptivity.
  • the type of surface treatment agent used for surface coating is not particularly limited, and, for example, raw starch, oxidized starch, esterified starch, cationized starch, enzyme-modified starch, aldehyde-modified starch, hydroxylated starch and the like Modified starches; Cellulose derivatives such as carboxymethyl cellulose, hydroxyl cellulose and methyl cellulose; Modified alcohols such as polybul alcohol and carboxyl-modified polybul alcohol; styrene butadiene copolymer, polyvinyl acetate, polyvinyl chloride It is possible to use a rue acetate-bule copolymer, polyvinyl chloride, poly salt, vinylidene, polyacrylate, polyacrylamide, etc.
  • a coating obtained by adding a surface sizing agent such as styrene acrylic acid, styrene maleic acid, an olefin based compound, or a cationic sizing agent to the surface treating agent.
  • the linear pressure should be as low as possible, as long as the smoothness of the paper can be maintained. It is preferable to use soft calenders.
  • the ink receiving layer contains a pigment and a binder.
  • the pigment can be appropriately selected from known pigments. Specific examples thereof include silica (including colloidal silica), alumina (including colloidal alumina), aluminum hydroxide, kaolin, talc, calcium carbonate, titanium dioxide, clay, zinc oxide, etc. Alternatively, multiple mixtures can be used. Among them, alumina is an acid oxide of aluminum obtained by calcining aluminum hydroxide or the like, and can be exemplified by, for example, ⁇ -alumina, j8-anoremina, ⁇ -alumina and the like. -It is preferable to use alumina because the gloss of the ink receiving layer is further improved.
  • the particle diameter of alumina, BET specific surface area can be appropriately selected as necessary, but the average particle diameter (laser diffraction method It is preferable to use an alumina of 1. 0 to 4.0 m) because the glossiness of the ink receptive layer is improved. In particular, an anolemina of 1. 5 to 3. 3 / z m is preferably used. Prefer! /.
  • the binding agent may be of any type as long as it is a polymer compound capable of forming a film. Specifically, completely acid or partially acid polyvinyl alcohol; carboxylic acid-defective polybule alcohol; silyl-modified polybule alcohol; acetatocetyl-modified polybule alcohol; polybutyl acetar resin; oxidized starch, Starches such as esterified starch; cellulose derivatives such as carboxymethyl cellulose and hydroxyl cellulose; polybutyl pyrrolidone; casein; gelatin; soy protein; styrene-one acrylic resin and derivatives thereof; styrene butadiene latex, acrylic resin, It is possible to use acetate alone or in combination with urethra chloride, urethan emulsion, urethan emulsion, urea emulsion, alkane aldehyde, and derivatives thereof alone or in combination. In particular, polyvinyl alcohol (including modified products) is preferable
  • the amount of the binder to be added is not particularly limited as long as the necessary layer strength can be obtained, but it is preferably 5 parts by mass to 30 parts by mass with respect to 100 parts by mass of the pigment 20 More preferably, it is at most parts by weight. If the blending amount is less than 5 parts by mass, the strength of the ink receiving layer decreases. If it exceeds 30 parts by mass, the ink absorption of the ink receiving layer tends to be reduced. Also
  • the polybule alcohol in the binder is The proportion is preferably 30% by mass or more, more preferably 50% by mass or more.
  • the ink receiving layer can be formed by applying a coating liquid for ink receiving layer.
  • the coating method may be a known coater such as blade coater, air knife coater, roll coater, brush coater, kiss coater, squeeze coater, curtain coater, die coater, die coater, gravure coater, cast coater, etc.
  • the power that can be selected appropriately from the coating methods used to obtain an inkjet recording sheet with particularly high gloss Cast coating (coating by cast coating) is preferred from the viewpoint of
  • an ink jet recording sheet having high gloss it is preferable to form an ink receptive layer by the V, conventional cast coating method, from the viewpoint of heat resistance.
  • This cast coating method is performed by pressing the coated layer against a heated mirror surface while the surface of the coated layer coated with the paint for ink receiving layer is in a wet state, and then drying.
  • the cast coating method is: (1) a wet casting method (direct method) in which the coated layer is pressed (pressure-welded) against a mirror-finished heating drum while it is in a wet state (as-coated); 1) The wet coated layer is once (semi) dried and then swell plasticized (wet) by rewet liquid, pressed onto a mirror-finished heating drum and dried (Rewet method), (3
  • the gel coating method can be generally divided into three types: gel cast method (coagulation method), in which the wet coating layer is made into a gel state by coagulation treatment such as coagulation liquid, and pressed onto a mirror-finished heated drum and dried. Ru.
  • V the same as the displacement method, except that the mirror surface (for example, a heated mirror drum or a metal mirror such as a flat mirror) is pressed against the coating layer in the wet state (including gel state in the wet state). is there.
  • the mirror surface for example, a heated mirror drum or a metal mirror such as a flat mirror
  • the rewetting method is preferable from the viewpoint of obtaining high strength and gloss which can also use the above-mentioned displacement method, and from the point of improving the productivity of the coagulation method.
  • any aqueous solution containing a compound having the function of coagulating polybule alcohol can be used, but in particular, Treatment solutions containing boric acid and borate are preferred. By mixing and using boric acid and a borate, it becomes easy to obtain a solidified state of appropriate hardness, and it is possible to obtain an inkjet recording sheet having a good gloss.
  • casein is used as a binding agent, an aqueous solution containing a compound having the function of coagulating casein is treated as a binder. It can be used as a fluid.
  • a treatment liquid having a function of drying the coated layer coated with the coating liquid for the ink receiving layer and plasticizing the binder of the coated layer Solution is applied to the coated layer, and then the coated layer is pressure-bonded to the heated mirror surface to impart gloss.
  • the treatment liquid when the treatment liquid is applied, the ink receiving layer is in a dry state, so that it is difficult to copy the surface of the mirror drum surface.
  • productivity can be improved because the coating speed can be increased as compared with other methods.
  • a pigment dispersant if necessary, a water retention agent, a thickener, an antifoamer, an antiseptic agent, a coloring agent, a water resistant agent, a wetting agent
  • An agent, a fluorescent dye, an ultraviolet absorber, a cationic polymer electrolyte, etc. can be added as appropriate.
  • the method for applying the treatment liquid may be, for example, a roll, a spray, or a curtain method.
  • the ink jet recording sheet of the embodiment according to the second aspect of the present invention is configured by providing an undercoat layer and an ink receiving layer in this order on a support.
  • the support a known material can be appropriately selected and used. It is particularly preferable to use paper (coated paper, uncoated paper, etc.) as the base paper.
  • the filler it is also possible to use a conventionally known inorganic filler and organic filler in combination. Any filler that is usually used in neutral papermaking and alkaline papermaking can be used without any limitation.
  • Any filler that is usually used in neutral papermaking and alkaline papermaking can be used without any limitation.
  • the light calcium carbonate / silica composite particles according to the first invention may be used.
  • the method for producing a support, the surface coating after paper making, and the surface treatment are also the same as in the embodiment according to the first invention. The explanation is omitted.
  • An under layer is present between the base paper and the ink receiving layer to aid in the uniform coating and ink absorption of the ink receiving layer.
  • the under layer contains a pigment and a binding agent, and the pigment contains light calcium carbonate-silica composite particles.
  • the same light calcium carbonate-silica composite particles as used in the embodiment according to the first invention are used, so the description of the same parts will be omitted.
  • the light calcium carbonate calcium carbonate power of the Rosetta-type light calcium carbonate-mosilica composite particles obtained has good absorption characteristics, and when this is used as a pigment of the under layer, the ink absorbability of the ink jet recording paper is obtained. Is preferable because it improves. Since the light calcium carbonate-silica composite particles obtained by the above-mentioned Rosetta-type light calcium carbonate carbonate and the like have a light calcium carbonate particle serving as a core, they have a large number of voids in the composite particles and the ink absorbability is improved. It is thought that.
  • the reason for improving the ink absorbability and the strength of the under layer by using the above-described light calcium carbonate-silica composite particles as a pigment is not clear, but is considered as follows. That is, in the case of light calcium carbonate-silica composite particles, since primary particles of silica are attached to the surface of light calcium carbonate, a large amount of ink having an oil absorption larger than that of calcium carbonate having the same particle diameter is contained in the pigment. Can be absorbed. In particular, when light calcium carbonate serving as a core forms secondary particles, a space is formed between primary particles of calcium carbonate, resulting in a further increase in oil absorption.
  • the specific surface area and the ratio of the pigment adsorbing the binder are smaller than that of a single silica of the same particle diameter. Since the amount is reduced (as the required amount of binder is decreased), it is considered that an effective amount of binder is secured and the strength of the under layer is increased. In addition, when the specific surface area of the pigment decreases, the stability of the paint containing it also increases.
  • the light calcium carbonate-silica composite particles have the characteristics of silica and the characteristics of light calcium carbonate. It is considered that the combination of these properties is considered, and there is an advantage that the ink absorbency, print density, or sharpness can be properly adjusted by adjusting the blending ratio of these.
  • the vividness is an index for clearly printing an image, and is an evaluation that integrates the printing density, the image reproducibility, and the presence or absence of image unevenness. From these facts, the solid mass ratio (CaCO 2 / SiO 2) of the light calcium carbonate Z silica in the light calcium carbonate silica composite particles is
  • the above ratio is less than 25/75, the properties of the silica are exhibited overall, and the strength of the under layer is apt to decrease because the adsorption property is too high and the binding agent is adsorbed.
  • the above ratio exceeds 75Z25, the characteristic of light calcium carbonate is largely developed, the adsorption characteristic is lowered, and the ink absorptivity and the printing density are easily lowered.
  • the solid content mass ratio can be determined, for example, by measuring light calcium carbonate-silica composite particles with a fluorescent X-ray to quantify Ca and Si.
  • the oil absorption of the light calcium carbonate-silica composite particles is preferably 100 to 250 ml Z 100 g. If the oil absorption of the composite particles is less than 100 ml ZlOOg, the ink absorption may decrease, and if it exceeds 250 ml Zl 00g, the under layer strength may decrease. A more preferable oil absorption amount is 120 to 200 ml Z 100 g, and a further preferable range is 140 to 180 ml Z 100 g.
  • Oil absorption can be measured according to IS K5101.
  • the BET specific surface area of the light calcium carbonate / silica composite particles is 5 to 150 m 2 Zg.
  • the BET specific surface area of the composite particles is less than 5 m 2 Zg, the ink absorptivity decreases, and when it exceeds 150 m 2 Z g, the strength of the under layer decreases and the viscosity of the coating liquid increases and the operability decreases.
  • a more preferable BET specific surface area is 10 to: LOOm 2 Zg, and a further preferable range is 20 to 50 m 2 Zg.
  • the BET specific surface area can be measured by a nitrogen adsorption method.
  • the average particle diameter of the light calcium carbonate-silica composite particles is preferably 1 to 10 ⁇ m.
  • the average particle size of the composite particles is less than 1 ⁇ m, the voids in the composite particles are reduced and the ink absorbability is reduced.
  • the average particle size exceeds 10 m, the smoothness of the under layer may be impaired, and it may be difficult to uniformly provide the ink receiving layer.
  • a more preferable average particle diameter is 2 to 9 ⁇ m, and a further preferable range is 3 to 8 ⁇ m.
  • the average particle size can be measured using a laser method particle size measuring apparatus (for example, a trade name of Master Malvern, Inc .: Master-I sizer-type).
  • the present invention is effective when producing an inkjet recording sheet by a cast coating method. That is, in the cast coating method, since it is necessary to press the coated layer against the cast drum to obtain a glossy surface, drying of the coated layer proceeds only from the side not in contact with the cast roll of the support. Therefore, although the cast coating method has a low drying speed and low productivity, the productivity can be improved by increasing the air permeability of the under layer.
  • the reason is considered to be that the light calcium carbonate-silica composite particles contain voids as described above.
  • the average particle size of the composite particles it is preferable to set the average particle size of the composite particles to 1 m or more.
  • the above-mentioned Rosetta-type light calcium carbonate calcite has a great effect of improving the air permeability of the under layer having many voids because of the chestnut-like shape.
  • the air permeability of the support provided with the under layer is preferably 300 seconds or less, more preferably less than 100 seconds.
  • the method for producing the composite particles is the same as the method for producing the embodiment according to the first aspect of the present invention, so the description will be omitted.
  • the pigment of the under layer in addition to the light calcium carbonate-silica composite particles, it is also possible to use an inorganic pigment and an organic pigment in combination, if necessary, as long as the effects of the present invention are not impaired. These pigments can be used without any limitation as long as they are pigments generally used in coated paper.
  • synthetic silica, alumina and alumina hydrate (alumina sol, colloidal alumina, pseudoboehmite etc.), aluminum silicate, magnesium silicate, magnesium carbonate, light calcium carbonate, calcium carbonate, kaolin, talc, calcium sulfate, dioxide Titanium, zinc oxide, zinc carbonate, calcium silicate, aluminum hydroxide
  • Inorganic pigments such as urea; organic pigments such as urea formalin resin, polystyrene resin and phenol resin; and one or more selected from kabuto etc. can be used in combination.
  • light calcium carbonate / silica composite particles and other pigments are used in combination, light calcium carbonate / silica composite particles are preferably contained in an amount of 60% by mass or more in all pigments.
  • the same binder as the binder for the ink receiving layer in the embodiment according to the first invention can be used as the binder for the under layer, so the description will be omitted.
  • the use of polyvinyl alcohol (including modified products) is preferable because it improves the transparency of the under layer and improves the color developability of the ink remaining in this layer.
  • the amount of the binder contained in the under layer is not particularly limited as long as the necessary layer strength can be obtained, but it is preferably 3 to 70 parts by mass with respect to 100 parts by mass of the pigment. It is more preferred that If the blending amount of the binder is small, the strength of the under layer decreases. If the blending amount is too large, the ink absorbability tends to be reduced.
  • the under layer may contain a cationic polymer compound.
  • Examples of the cationic polymer compound include primary amine, secondary amine, tertiary amine, quaternary ammonium salt and cyclic amine, or a polymer compound using these salts as monomers.
  • Specific examples include berylimine, alkylamine, alkyleneamine, buramine, allylamine, cycloaliphatic amine, epihalohydrin, dialkylaminoethyl methacrylate, dialkylaminoalkyl arylate, dialkylaminoalkyl acrylamide, diallyldimethyl
  • polyethylenimine type oils polyamine type oils, polyamide type oils, polyamidoepichlorohydrin, which are cationic polymer compounds having monomers such as ammonium salts, acrylamides, amidoamines and amidines.
  • the printing quality is excellent regardless of whether the dye ink or the pigment ink is used, and the printing density is particularly high.
  • Condensates (homopolymers), copolymers and derivatives of dialkyl (alkylene) amines, lohydrins and diaryl dimethyl ammonium salts, which increase the degree and water resistance, are preferred.
  • dialkyl (alkylene) amines, polymers of lohydrin (homopolymers), copolymers, and derivatives are most preferable because they have low molecular weight and are not likely to inhibit the ink absorption of the ink receiving layer.
  • pigment dispersants In the under layer, if necessary, pigment dispersants, flow improvers, water retention agents, thickeners, antifoaming agents, foam inhibitors, mold release agents, surface property modifiers, foaming agents, penetrants, coloring dyes, coloring Pigments, optical brighteners, UV absorbers, antioxidants, preservatives, fungicide, P H adjusting agents, softeners, may be added various aids.
  • the under layer can be formed as one or more layers on one side or both sides of the support.
  • the components of the coating liquid may be different within the range specified in the present invention.
  • the coating material may be layered in plural layers by a slide die coater or the like, coated on a support and then dried.
  • an interface exists between the coating layers, and the interface is observed, for example, by observing the cross section of the ink receiving layer with an electron microscope or an optical microscope, or by a gas adsorption method or mercury porosimeter. It can be identified by measuring the pore size distribution.
  • the coating amount of the under layer and more preferably it is preferred instrument is 3 ⁇ 30GZm 2 is 5 ⁇ 20gZm 2. If it is less than 3 gZm 2 , the support can not be covered sufficiently and coating unevenness may occur. If it exceeds 30 g Zm 2 , the strength of the coated layer may be reduced to cause the under layer peeling.
  • the physical properties of the coated paper may differ between the case where it is applied at one time and the case where it is applied twice. Also, in this case, as described above, the interface of the coated layer can be easily observed in the case of double coating by microscopic observation or the like.
  • the physical properties of the coated paper may differ due to binder migration and the like, so the number of times of coating may be determined according to the required characteristics and the like.
  • the drying load of the coater is large, and it is affected by the equipment, so in the case of a small coater, it may be necessary to coat twice.
  • a calender device such as a machine calender, a super calender, a soft calender, etc. before or after applying the under layer.
  • the ink receiving layer contains a pigment and Z or a binder, and retains colored components in the ink.
  • the pigment, the binder, and the pigment for the ink receiving layer in the embodiment according to the first aspect of the invention can be used in the ink receiving layer, so the description will be omitted. If necessary, various assistants similar to those of the under layer can be added.
  • the coating amount of the ink receiving layer can be optionally adjusted within the range in which sufficient ink absorbency can be obtained while covering the surface of the under layer, but from the viewpoint of achieving both recording density and ink absorbency, one side It is preferable that it is 3-30 g / m ⁇ 2 > in solid content conversion. A further preferred range is 5 to 20 g / m 2 . If the coating amount is less than 3 g / m 2 , the under layer may not be covered sufficiently and coating unevenness may occur, and if it exceeds 30 g / m 2 , the coating layer in the case of the cast method described later. The peelability of the mirror drum force is reduced, and the coating layer may be attached to the mirror drum.
  • the ink receiving layer can be formed by applying a coating liquid for ink receiving layer.
  • a coating liquid for ink receiving layer As the application method, the same method as the application method of the ink receiving layer in the embodiment according to the first aspect of the present invention can be used, so the description will be omitted.
  • Method of forming ink receiving layer When it is possible to obtain an ink jet recording sheet having the same high gloss as that of a silver salt photograph, it is preferable to form an ink receiving layer by a V-like cast coating method from the point of view. This cast coating method is carried out by pressing the coated layer against a heated mirror surface while the surface of the coated layer coated with the paint for ink receiving layer is in a wet state, and then drying.
  • the first layer contains the light calcium carbonate-silica composite particles, an appropriate void is formed in the layer, and when the coating liquid for the ink receiving layer is pressed against the cast drum and dried, Since the vapor evaporated from the coating liquid is easily released, the cast drum may be dried immediately and the cast drum may be fogged or any trouble may be reduced if the coating layer adheres to the cast drum.
  • the cast coating method can be generally divided into three types, a direct method, a rewetting method, and a coagulation method. These are the same as those described in the first embodiment of the present invention. , I omit the explanation.
  • the rewetting method is preferable from the viewpoint of obtaining high strength and gloss which can also use the above-mentioned displacement method, and from the point of improving the productivity of the coagulation method.
  • a pigment dispersant if necessary, a water retention agent, a thickener, an antifoamer, an antiseptic agent, a coloring agent, a water resistant agent, a wetting agent Fluorescent dyes, ultraviolet absorbers, cationic polymer electrolytes and the like can be added as appropriate.
  • a method for applying the treatment liquid include, but not limited to, roll, spray and curtain methods.
  • an overcoat layer comprising a coating layer containing organic fine particles, inorganic fine particles, or a polymer compound, etc. is provided on the ink receiving layer for the purpose of adjusting the glossiness and the coefficient of friction. It can also be done.
  • a back layer may be provided on the support opposite to the side on which the ink receiving layer is provided to provide writability, antistatic properties, antifouling properties, slipperiness, and the like. Is also possible.
  • the obtained slurry was subjected to 100 mesh sieve to separate coarse particles, and suction filtration was performed using No. 2 filter paper. Furthermore, the filtrate was re-dispersed in water so that the solid matter was 10% by mass, and light calcium carbonate-silica composite particles A of 50 Z 50 in weight ratio of light calcium carbonate Z silica were obtained.
  • the oil absorption capacity of this composite particle was 160 ml Z 100 g, the BET specific surface area was 28 m 2 Z g, and the average particle size was 6.1 ⁇ m.
  • the sample after the above suction filtration is redispersed in ethanol so that the filtrate has a solid content of 10% by mass, followed by filtration, and the powder sample dried at 105 ° C. Using.
  • the weight ratio of light calcium carbonate Z silica is 70 Z30, and the oil absorption amount is 150 ml Z 100 g, in the same manner as in the production of the light calcium carbonate-silica composite particles A except that the dispersion amount of the rosetta light calcium carbonate is 1407 g.
  • the coating solution A was coated to a coating amount of 15 g / m 2 to form an under layer.
  • Coating solution A 100 parts of silica as a pigment (Fine Seal X-37B: manufactured by Tokuma Co., Ltd.), 5 parts of SB latex (LX438C: manufactured by Sumitomo Chemical Co., Ltd.) as a binding agent, and polyvinyl alcohol (PVA 117: stock 20 parts of Kuraray Co., Ltd. and 5 parts of sizing agent (Polymeron 360: Arakawa Chemical Industry Co., Ltd.) were blended to prepare a coating liquid having a solid content concentration of 20%.
  • 10 g / m 2 of coating solution B is coated on the coated surface of coating solution A with a roll coater, and while the coating layer is in a wet state, coagulate using coagulating solution C, and then press
  • the coated layer was pressure-bonded to the heated mirror-finished surface via a roll, the mirror surface was copied, and dried to obtain an inkjet recording sheet with a basis weight of 9 OgZm 2 .
  • Coating solution B 100 parts of high purity alumina (UA5605: manufactured by Showa Denko KK, average particle diameter: 2.8 m) as a pigment is blended, and completely densified poly vinyl alcohol having a polymerization degree of 500 (PVA 105: Kuraray Co., Ltd., 15 parts of oxidation degree 9) was blended, and 0.2 parts of an antifoaming agent was blended to adjust a coating liquid having a concentration of 30%.
  • PVA 105 Kuraray Co., Ltd., 15 parts of oxidation degree 9
  • the coagulation solution was adjusted.
  • the coating liquid for the ink receiving layer using the following coating liquid B1 instead of the coating liquid B, the coating liquid is coated with an air one-knife coater to a coating amount of 12 gZm 2 and then a coagulating liquid C Coagulation and An ink jet recording sheet was obtained in exactly the same manner as in Example 1, except that it was dried as it was without cast coating.
  • Coating solution B1 Silica as a pigment (Nipp JEL AY-603: manufactured by Tosoh Silica Corporation) 70 parts and silica (Mizkasil P-50: manufactured by Mizusawa Chemical Industry Co., Ltd.) 30 parts, as a binder 35 parts of alcohol (PVA-117: manufactured by Kuraray Co., Ltd.) and 25 parts of ethylene acetate vinyl copolymer latex (Likabond BE-7000: manufactured by Chuo Ri-i Kogyo Co., Ltd.), force size (Polymeron 360: 2 parts of Araiso 11 Chemical Industry Co., Ltd., 5 parts of dye fixing agent (PAS-H-10L: made by Nitto Boseki Co., Ltd.), an antifoaming agent, dilution water, etc. are appropriately blended, and the solid concentration is 18%
  • TP121 spindle-like light calcium carbonate (TP121, manufactured by Okutama Kogyo Co., Ltd.) is blended so as to have a loading rate S7% in the paper as it is.
  • An inkjet recording paper was obtained in exactly the same manner as in Example 1 except for the above.
  • TP121 is composed of spindle-shaped primary particles, and the primary particles do not aggregate and do not form secondary particles.
  • white carbon TIXOLEX 17, manufactured by Rhdia Silica Korea
  • a light sales rosetta type light calcium carbonate (a) are used instead of the light calcium carbonate-silica composite particle A.
  • the ink jet recording paper was obtained.
  • the average particle diameter of the above mixed filler was 3.8 m, and the oil absorption amount was 137 ml / 100 g.
  • titanium oxide (FA-50: manufactured by Furukawa Machine Metals Co., Ltd.) was blended in place of the light calcium carbonate-silica composite particles A so that the filler content in the paper would be 2%, except that In the same manner as in Example 1, an inkjet recording sheet was obtained.
  • An inkjet recording paper was obtained in exactly the same manner as in Example 1 except that no filler was added to the base paper.
  • titanium oxide (FA-50: manufactured by Furukawa Machine Metals Co., Ltd.) was blended in place of the light calcium carbonate-silica composite particles A so that the filler content in the paper would be 2%, except that An ink jet recording sheet was obtained in the same manner as in Example 3.
  • the fluorescent-silica composite particles were analyzed by fluorescent X-ray to determine Ca and Si, thereby obtaining [0086] 2) Evaluation of each inkjet recording paper (2-1) Whiteness of base paper: The uncoated base paper was measured with a color difference meter (manufactured by Murakami Color Research Laboratory) according to JIS P8148.
  • the bulkiness is about 4% or more.
  • a predetermined pattern is recorded on the ink receiving layer with black ink by an ink jet printer (PM-950C: trade name of Seiko Epson Corporation) using dye ink, and the ink receiving layer is viewed from the side opposite to the ink receiving layer.
  • the degree of transparency of the printed image on the side was observed.
  • the strike-through rating indicates the opacity of the paper. If the strike through is ⁇ , it can be said that the opacity is excellent :: The image can not be seen from the opposite side
  • the coating layer was attached to the cast drum to make it dirty and the maximum value of the coating speed in the range was evaluated. If the cast operability is ⁇ , it can be said that the cast operability is excellent.
  • Coating speed is more than 20mZ minutes and less than 25mZ minutes
  • Example 1 1 50/50 6.1 160 28 Cast Coat Silica Composite Particles A
  • Example 2 7 70/30 4.6 150 26 Cast Coat-Silica Composite Particles B
  • Example 3 1 7 50/50 6.1 160 28 matte silica composite particles A
  • the mixed slurry was heated to 85 ° C. while being sufficiently stirred by a laboratory agitator.
  • a 10% sulfuric acid solution was added by a rotary pump, and at this time, it was added immediately below the stirring blade of the laboratory agitator so that the sulfuric acid-added portion was sufficiently stirred.
  • the final pH of the slurry after the addition of sulfuric acid is 8.0 and the total sulfuric acid addition time is 240 minutes so that the temperature is constant and the sulfuric acid is added at a constant rate. did.
  • the resulting slurry is separated by a 100 mesh sieve to separate coarse particles, and suction filtered using No.
  • the weight ratio of light calcium carbonate Z silica is 70 Z30, and the oil absorption is 140 ml Z 100 g, in the same manner as in the production of the light calcium carbonate silica composite particles C except that the dispersion amount of the rosetta light calcium carbonate is 1436 g.
  • Light calcium carbonate-silica composite particles E having a BET specific surface area of 26 m 2 Z g and an average particle size of 3.6 m were obtained.
  • Pulp consisting of 100 parts of hardwood bleached kraft pulp (L BKP) with 350 ml c 's' f freeness, 4 parts of acid titanium, cationic starch (Kate 304L: Nippon NSC Co., Ltd.) 0.4 parts, aluminum sulfate 1.0 part, 0.1 part of synthetic sizing agent, and 0.02 part of retention aid were added to obtain a norp slurry. Papermaking was carried out using this slurry strength paper machine, and starch was impregnated on both sides by a size press so that the dry coating amount per one side was 1.5 gZm 2 to obtain a support.
  • a coating solution D was coated on one side of this support using a blade coater to give a coating amount of lOgZm 2 to form an under layer, and a coated paper with a basis weight of 180 g Zm 2 was obtained.
  • Coating solution D 100 parts of light calcium carbonate-silica composite particles C as pigment, 30 parts of polybul alcohol (PVA 117: manufactured by Kuraray Co., Ltd.) as binder and ethylene glycol acetate (BE7000: Central Rikko Kogyo Co., Ltd.) 5 parts, cationic resin (polyamine ammonia epichlorohydrin, molecular weight 100,000) 5 parts, sizing agent (Polymeron 360: Arakawa Chemical Industrial Co., Ltd.) 2 parts, antifoam agent 0.5 part A coating solution (solid content: 23%) was prepared.
  • PVA 117 manufactured by Kuraray Co., Ltd.
  • BE7000 Central Rikko Kogyo Co., Ltd.
  • cationic resin polyamine ammonia epichlorohydrin, molecular weight 100,000
  • sizing agent Polymeron 360: Arakawa Chemical Industrial Co., Ltd.
  • antifoam agent 0.5 part
  • a coating solution solid content: 23%) was prepared.
  • Coating solution E 100 parts of silica as a pigment (Fine Seal X-37: manufactured by Tokuama Co., Ltd.), 5 parts of SB latex (LX438C: manufactured by Sumitomo Chemical Co., Ltd.) as a binding agent, and polyvinyl alcohol (PVA 117: Kuraray Co., Ltd.
  • An aqueous coating solution E having a concentration of 20% was prepared by blending 24 parts of a product, and 5 parts of a sizing agent (Polymeron 360: manufactured by Arakawa Chemical Industry Co., Ltd.).
  • the coagulation liquid was adjusted.
  • An ink jet recording sheet was prepared in the same manner as in Example 4, except that the light calcium carbonate / silica composite particles C were replaced with 100 parts of the light calcium carbonate / silica composite particles D as a pigment for the coating liquid D. Obtained.
  • Inkjet was carried out in exactly the same manner as in Example 4, except that 100 parts of the light calcium carbonate-silica composite particles E were blended instead of the light calcium carbonate / silica composite particles C as a pigment for the under layer coating liquid D. I got a recording sheet.
  • Example 4 As a coating liquid for the ink receiving layer, Example 4 was used except that the following coating liquid E1 was used instead of the coating liquid E, and the coagulating liquid F1 was used instead of the coagulating liquid F. Ink jet recording paper was obtained in the same manner as in.
  • Coating solution E1 100 parts of silica as a pigment (Fine seal X-37: manufactured by Tokuma Co., Ltd.), 30 parts of an aqueous urethane resin (HUX- 980: manufactured by Asahi Denka Kogyo Co., Ltd.) as a binding agent, and Zein (ALACID) 10 parts of lactic case, and 5 parts of a release agent (Nopcoat SYC: manufactured by San Nopco Co., Ltd.) were mixed to prepare an aqueous coating liquid E1 having a concentration of 30%.
  • Coagulation solution F1 5% of calcium formate (manufactured by Asahi Chemical Industry Co., Ltd.) and 1% of a dye fixing agent (Dyfix YK-50: manufactured by Daiwa Chemical Co., Ltd.) were mixed to prepare a coagulation solution.
  • Rosetta type light calcium carbonate (Alpaca 5970, manufactured by Specialty Minerals Inc., oil absorption amount 120 ml Z 100 g, BET specific surface area 12 m 2 Z g instead of light calcium carbonate-silica composite particle C as a pigment for the coating liquid D for the under layer
  • An ink jet recording sheet was obtained in the same manner as in Example 4 except that 100 parts of an average particle diameter of 3.O / zm were blended.
  • BET specific surface area The specific surface area was measured by a nitrogen adsorption amount using an automatic specific surface area measuring apparatus by volume method (Diemi-2360 manufactured by Micromeritics Co., Ltd.). When the sample was a slurry, it was dispersed in ethanol so as to have a solid content of 10%, dried at 105 ° C., and then the BET specific surface area was measured.
  • a Sellotape registered trademark, transparent adhesive tape
  • a digital force gauge When the tape was peeled off the surface of the under layer, the maximum value read with a digital force gauge was taken as the following measurement value.
  • peeling off the tape the strength of the coated layer of the under layer can be measured.
  • the following “paper peeling” indicates the case where the base paper strength is peeled not the under layer but the case where the peeling strength is the lowest and the part is the base paper. In this case, adhesion of the base paper fiber to the tape can be visually confirmed. The occurrence of paper peeling indicates that the strength of the interface between the under layer and the base paper is low, and indicates that peeling of the coated layer or cast coatability is deteriorated.
  • the measured value is lOOogf (9.81N) or more, no paper peeling!
  • the measured value is 500 gf (4.90 N) or more and less than 700 gf (6.86 N). Or more than that there is paper peeling.
  • the measured value is less than 500 gf (4.90 N).
  • a red and green solid image is recorded on a recording sheet with a spreadsheet software “Etacel” using an ink jet printer (PM-950C: trade name of Epson Corporation) using dye ink, and a red and green mixed color is used. Bleeding was visually evaluated at the boundaries of parts.
  • a predetermined pattern was printed on a recording sheet using an ink jet printer (PM-950C: trade name of Epson Corporation) using a dye ink, and the vividness of the image area was visually evaluated.
  • Vividness is an index by which an image is printed beautifully, and printing density and image
  • the evaluation is a comprehensive evaluation of the appearance and the presence or absence of image unevenness. Here, the following evaluation was made by visually judging the printed image.
  • the air permeability of the recording paper before forming the ink receiving layer was measured according to the Papers and Pulp Technical Association Ci. TAPPI No. 5.
  • the measured value is less than 100 s.
  • the measured value is at least 100 s but less than 300 s.
  • the measured value is 300 seconds or more and less than 600 seconds.
  • the measured value is 600 s or more.
  • Example 5 light calcium carbonate 50/50 4.4 160 28 monosilica composite particles D
  • the light calcium carbonate-silica composite particles as the pigment of the under layer, it is possible to obtain an ink jet recording sheet excellent in the under layer strength and the ink absorptivity.
  • FIG. 1 is a view showing an example of the form of light calcium carbonate (Rosetta-type calcite system) dispersed in a liquid.
  • FIG. 2 is a view showing an example of the form of light calcium carbonate / silica composite particles dispersed in a liquid.

Landscapes

  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

L’invention concerne un papier d’impression à jet d’encre offrant une excellente opacité et pouvant être facilement coupé, ou un papier enduit offrant une excellente absorption de l’encre et dont la couche d’enduction présente une excellente résistance. Le papier d’impression à jet d’encre selon l’invention comporte un papier support sur lequel est appliquée une couche réceptrice d’encre contenant un pigment et un liant, le papier support contenant une charge constituée de particules légères d’un composite carbonate de calcium-silice comprenant des particules légères de carbonate de calcium dont la surface est recouverte de silice. Le papier enduit selon l’invention contient les particules légères du composite carbonate de calcium-silice ci-dessus, comprenant des particules légères de carbonate de calcium dont la surface est recouverte de silice.
PCT/JP2005/017461 2004-09-27 2005-09-22 Papier d’impression a jet d’encre Ceased WO2006035661A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2004-279578 2004-09-27
JP2004279578A JP4496906B2 (ja) 2004-09-27 2004-09-27 インクジェット記録媒体
JP2004-284661 2004-09-29
JP2004284661A JP4213103B2 (ja) 2004-09-29 2004-09-29 インクジェット記録用紙
JP2004-290365 2004-10-01
JP2004290365 2004-10-01

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WO2006035661A1 true WO2006035661A1 (fr) 2006-04-06

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0559694A (ja) * 1991-08-27 1993-03-09 Sanyo Kokusaku Pulp Co Ltd インクジエツト記録用紙
JPH0672017A (ja) * 1992-08-07 1994-03-15 Nippon Paper Ind Co Ltd インクジェット記録用紙及びその製造方法
JPH06293179A (ja) * 1993-04-09 1994-10-21 New Oji Paper Co Ltd インクジェット記録用シート
JPH07196317A (ja) * 1993-12-28 1995-08-01 Agency Of Ind Science & Technol 製紙用フィラーとしての軽質炭酸カルシウムの製造法
WO2001064585A1 (fr) * 2000-03-03 2001-09-07 Nittetsu Mining Co., Ltd. Particule composite de carbonate de silice-calcium
JP2003020592A (ja) * 2001-07-05 2003-01-24 Oji Paper Co Ltd 中性紙
JP2004209965A (ja) * 2002-12-17 2004-07-29 Oji Paper Co Ltd インクジェット記録用塗工紙及びその記録物

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0559694A (ja) * 1991-08-27 1993-03-09 Sanyo Kokusaku Pulp Co Ltd インクジエツト記録用紙
JPH0672017A (ja) * 1992-08-07 1994-03-15 Nippon Paper Ind Co Ltd インクジェット記録用紙及びその製造方法
JPH06293179A (ja) * 1993-04-09 1994-10-21 New Oji Paper Co Ltd インクジェット記録用シート
JPH07196317A (ja) * 1993-12-28 1995-08-01 Agency Of Ind Science & Technol 製紙用フィラーとしての軽質炭酸カルシウムの製造法
WO2001064585A1 (fr) * 2000-03-03 2001-09-07 Nittetsu Mining Co., Ltd. Particule composite de carbonate de silice-calcium
JP2003020592A (ja) * 2001-07-05 2003-01-24 Oji Paper Co Ltd 中性紙
JP2004209965A (ja) * 2002-12-17 2004-07-29 Oji Paper Co Ltd インクジェット記録用塗工紙及びその記録物

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