WO2010113805A1 - Papier couché - Google Patents

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Publication number
WO2010113805A1
WO2010113805A1 PCT/JP2010/055400 JP2010055400W WO2010113805A1 WO 2010113805 A1 WO2010113805 A1 WO 2010113805A1 JP 2010055400 W JP2010055400 W JP 2010055400W WO 2010113805 A1 WO2010113805 A1 WO 2010113805A1
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WO
WIPO (PCT)
Prior art keywords
cellulose
coated paper
paper
coated
cellulose nanofibers
Prior art date
Application number
PCT/JP2010/055400
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English (en)
Japanese (ja)
Inventor
喜威 山田
勇二 阿部
正一 宮脇
志穂 勝川
裕 阿部
夕子 飯嶋
明 磯貝
Original Assignee
日本製紙株式会社
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.)
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Application filed by 日本製紙株式会社 filed Critical 日本製紙株式会社
Priority to JP2011507155A priority Critical patent/JPWO2010113805A1/ja
Publication of WO2010113805A1 publication Critical patent/WO2010113805A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating

Definitions

  • the present invention relates to coated paper with excellent printability.
  • Coated paper is roughly divided into glossy coated paper and matte coated paper.
  • the glossy coated paper include art paper, super art paper, and coated paper which have been conventionally used for high-grade printing.
  • the finished print of the glossy coated paper has high white paper gloss and high print gloss, and is called gloss tone.
  • matte coated paper which has a low gloss on the white surface and a flat, calm printed material, and a low gloss on the white paper but high gloss on the print gloss and matte tone
  • the demand for mat-like matte-coated paper has increased, since the character part after printing is easier to read than conventional gloss-like glossy coated paper.
  • coated paper As coated paper, in recent years, there has been a demand for coated paper having excellent printability which can withstand high-quality printing such as printing using a large number of photographs and designs and color printing.
  • Patent Document 1 using cellulose nanofibers as an additive for papermaking is disclosed in Patent Document 1, and it is described that smoothness and permeability resistance are improved.
  • high-quality coated paper generally has a large basis weight of the base paper and a large amount of pigment coating, and is the same due to smoothing by calendering, etc.
  • the basis weight is relatively high in density
  • the coated paper that has been made bulky by reducing the pigment coating amount has a reduced coverage of the base paper by the coated layer, so A feeling of roughness of the line portion, that is, minute gloss unevenness is remarkably observed, and there is a surface inferior in printability. Therefore, it is difficult to produce coated paper having low density and high printability without unevenness in gloss of the image area, and further development is desired.
  • waste paper pulp should be pulped while high quality paper, newsprint, magazines, flyers, coated paper, etc. are mixed.
  • using recycled paper pulp tends to increase the density as compared with using virgin mechanical pulp.
  • Patent Document 2 a method of achieving low density by blending hollow synthetic organic matter capsules as filler components
  • Patent Document 2 a synthetic organic foamable filler (for example, trade name: EXPANSEL, manufactured by Nippon Fillite Co., Ltd.) which expands due to heat in the dryer section during papermaking.
  • EXPANSEL trade name: EXPANSEL, manufactured by Nippon Fillite Co., Ltd.
  • a bulky base paper has a large amount of void compared to a common base paper, so the pigment coating liquid easily penetrates into the inside of the base paper, and the base paper coatability is compared to the case of using a base paper having a general density. Since the base paper coverage is deteriorated, the printability such as the white paper glossiness and smoothness is lowered, and minute gloss unevenness and the like in the image area are also generated, and the print quality is remarkably lowered. In addition, even when the coating amount is reduced, there is a problem that the base paper coverage also decreases and the printing quality decreases.
  • a coated paper having excellent printability, and in particular, it is excellent in smoothness and print glossiness, and small in uneven glossiness of printed matter. It is an object of the present invention to provide a coated paper, preferably a matte coated paper, having printability.
  • a coated layer containing cellulose nanofibers is preferably provided as the innermost coated layer adjacent to the base paper.
  • the content of the cellulose nanofibers in the coating layer is preferably 0.01 to 20 parts by weight with respect to 100 parts by weight of the pigment.
  • the coated paper of the present invention In the coated paper of the present invention, excessive penetration of the extremely fine pigment in the coating solution into the base paper is suppressed, and the base paper coverage is improved, so the effect is exhibited even with low density base paper, and the smoothness is smooth. A bulky coating layer is formed, the white paper glossiness and the printing glossiness are good, the gloss unevenness is small, and the coated paper is excellent in the ink receptivity.
  • the coated paper of the present invention is characterized in that, in the coated paper having at least one coating layer containing a pigment and an adhesive on a base paper, the coating layer further contains cellulose nanofibers.
  • the coating layer containing a pigment, an adhesive and cellulose nanofibers is preferably the innermost coating layer adjacent to the base paper.
  • the extremely fine pigment in the coated layer is excessively transferred to the base paper by the pigment in the coated layer or the pigment and the pulp fiber in the base paper being bonded via the cellulose nanofibers. It is thought that the penetration of the base paper is suppressed and the base paper coverage is improved. Therefore, when the coating is applied at a relatively low coating amount on the base paper having a high porosity, the effect appears notably. In addition, it is considered that a smooth and bulky coating layer is formed, the gloss unevenness is small, and the coated paper is excellent in ink receptivity.
  • the coated paper of the present invention is a coated paper having excellent printability, excellent in smoothness and print gloss, less in gloss unevenness, and high inking property.
  • the base paper used for the coated paper of the present invention is not particularly limited, and those into which ordinary pulp, filler and the like are blended can be used. There are no particular limitations on the type of pulp and the like blended in the base paper in the present invention. For example, chemical pulp (hardwood bleached kraft pulp (hereinafter referred to as LBKP) or unbleached kraft pulp (hereinafter referred to as LUKP), softwood bleached kraft pulp (hereinafter referred to as NBKP) or unbleached kraft pulp (hereinafter referred to as NUKP), etc.), mechanical pulp (grand pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), etc.), regenerated pulp (deinked pulp (DIP), etc.) alone or in any ratio Can be mixed and used.
  • chemical pulp hardwood bleached kraft pulp (hereinafter referred to as LBKP) or unbleached kraft pulp (hereinafter referred to as LUKP), softwood bleache
  • fillers to be incorporated into the base paper heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, kaolin, calcined kaolin, delami kaolin, clay, silica, talc, hydrated silica, amorphous silicate, Inorganic fillers such as white carbon and titanium oxide, and organic fillers such as synthetic resins such as urea-formalin resin, melamine resin, polystyrene resin, and phenol resin can be used alone or in combination at an arbitrary ratio.
  • the amount of filler used is preferably 5 to 18% by weight or more per pulp weight.
  • the base paper used in the present invention may further contain, if necessary, a sulfuric acid band, a sizing agent, a paper strength agent, a retention aid, a freeness enhancer, a coloring pigment, a dye, an antifoaming agent, a brightening agent and a pH. You may contain a modifier etc.
  • the method for making the base paper is not particularly limited, and it is possible to use acid wire paper using a long wire machine including a top wire, a gap former machine, a circular net machine, a machine combining the two, a Yankee dryer machine, etc.
  • the base paper may be either neutral papermaking or an alkaline papermaking method, and medium-grade base paper including recovered waste paper pulp obtained from newspaper waste paper can also be used.
  • a base paper may be coated with a surface treatment agent composed mainly of a water-soluble polymer.
  • a water-soluble polymer those generally used as surface treatment agents such as oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch, polyacrylamide, polyvinyl alcohol and the like can be used alone or in combination.
  • a paper strength agent for the purpose of water resistance and improvement of the surface strength and an external additive sizing agent for the purpose of imparting sizing can be added to the surface treatment agent.
  • the surface treatment agent can be applied by a coating machine such as a 2-roll size press coater or a gate roll coater, a blade metering size press coater, a rod metering size press coater and a film transfer type roll coater such as a shim sizer or JF sizer. .
  • a coating machine such as a 2-roll size press coater or a gate roll coater, a blade metering size press coater, a rod metering size press coater and a film transfer type roll coater such as a shim sizer or JF sizer.
  • the basis weight of the base paper for coated paper used in the present invention is not particularly limited, and a base paper having a basis weight of about 30 to 400 g / m 2 used as a general base paper for coated paper is suitably used.
  • a base paper having a basis weight of about 30 to 200 g / m 2 can be used.
  • the density of the base paper is also not particularly limited, and is about 0.3 to 1.0 g / cm 3 , preferably about 0.4 to 0.9 g / cm 3 .
  • the base paper is coated with a coating solution containing a pigment, an adhesive and cellulose nanofibers.
  • the cellulose nanofibers used in the present invention are cellulose single microfibrils having a width of 0.5 to 20 nm, preferably 2 to 5 nm, and a length of 0.5 to 15 ⁇ m, preferably 1 to 5 ⁇ m.
  • the cellulose nanofiber of the present invention becomes a transparent liquid when dispersed in water.
  • the B-type viscosity (60 rpm, 20 ° C.) in an aqueous dispersion having a concentration of 2% (w / v) is 10 to 7000 mPa ⁇ s, preferably 500 to 7000 mPa ⁇ s, more preferably 500 to 2000 mPa ⁇ s.
  • Cellulose nanofibers having a certain degree of viscosity can be suitably used.
  • the B-type viscosity of the aqueous dispersion of cellulose nanofibers can be measured by a known method, and can be measured, for example, using a VISCOMETER TV-10 viscometer manufactured by Toki Sangyo Co., Ltd.
  • the width and length of cellulose nanofibers can be measured using a transmission electron microscope.
  • a method of producing cellulose nanofibers used in the present invention a method of obtaining a cellulose raw material such as fine powder of cellulose which has been subjected to oxidation treatment with a catalyst by disintegrating using a high pressure homogenizer (cellulose nanofibers by chemical treatment), cellulose The method (cellulose nanofiber by mechanical processing) etc. can be illustrated by obtaining the suspension of a raw material by disintegration and classification using glass, a zirconia bead, etc. as a grinding
  • it is not limited to these manufacturing methods in order to obtain the cellulose nanofiber of the above-mentioned physical properties, it is preferable to use the cellulose nanofiber which gave the oxidation treatment with a catalyst and was manufactured.
  • Cellulose nanofibers that can be suitably used in the present invention, for example, use a cellulose-based raw material in the presence of (1) an N-oxyl compound, and (2) a bromide, an iodide or a mixture thereof, using an oxidizing agent It can be produced by subjecting the oxidized cellulose to wet atomization treatment, disaggregation, and nanofiberization.
  • the cellulose-based raw material used as the raw material of the cellulose nanofiber of the present invention is not particularly limited, and various wood-derived kraft pulp or sulfite pulp, powdered cellulose obtained by grinding them with a high pressure homogenizer or mill, or them
  • purified by chemical processing, such as acid hydrolysis, can be used.
  • plants such as kenaf, hemp, rice, bagasse and bamboo can also be used.
  • bleached kraft pulp, bleached sulfite pulp, powdered cellulose and microcrystalline cellulose powder are preferable, and powdered cellulose and microcrystalline cellulose powder are more preferable.
  • Powdered cellulose is a shaft-like particle made of microcrystalline cellulose obtained by removing non-crystalline parts of wood pulp by acid hydrolysis treatment, and crushing and sieving.
  • the degree of polymerization of cellulose in powdered cellulose is preferably about 100 to 500, and the degree of crystallinity of powdered cellulose by X-ray diffraction method is preferably 70 to 90%, and volume average particles by a laser diffraction particle size distribution measuring device
  • the diameter is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less.
  • a volume average particle diameter of 100 ⁇ m or less is preferable because a cellulose nanofiber dispersion excellent in fluidity can be obtained.
  • powdery cellulose used in the present invention for example, certain particles in the form of a rod shaft are produced by a method of purifying and drying an undegraded residue obtained after acid hydrolysis of a selective pulp, grinding and sieving.
  • crystalline cellulose powder having a diameter distribution may be used, or commercially available products such as KC floc R (manufactured by Nippon Paper Chemicals Co., Ltd.), Theorus R (manufactured by Asahi Kasei Chemicals), Avicel R (manufactured by FMC) may be used. Good.
  • N-oxyl compound used in oxidizing the cellulose-based material any compound can be used as long as it promotes the target oxidation reaction.
  • a substance represented by the following general formula (Formula 1) can be mentioned.
  • R 1 to R 4 represent the same or different alkyl groups having about 1 to 4 carbon atoms.
  • TEMPO 2,2,6,6-tetramethyl-1-piperidine-N-oxy radical
  • 4-hydroxy-2,2,6,6-tetra Methyl-1-piperidine-N-oxy radical hereinafter referred to as 4-hydroxy TEMPO
  • a derivative obtained from TEMPO or 4-hydroxy TEMPO can be preferably used, and in particular, a derivative of 4-hydroxy TEMPO can be most preferably used.
  • a 4-hydroxy TEMPO derivative a derivative obtained by etherifying a hydroxyl group of 4-hydroxy TEMPO with an alcohol having a linear or branched carbon chain having 4 or less carbon atoms, or esterified with a carboxylic acid or a sulfonic acid
  • derivatives obtained by When 4-hydroxy TEMPO is to be etherified if an alcohol having 4 or less carbon atoms is used, the derivative obtained becomes water soluble regardless of the presence or absence of saturation and unsaturated bond in the alcohol, and it is favorably used as an oxidation catalyst. Functional 4-hydroxy TEMPO derivatives can be obtained.
  • R is a linear or branched carbon chain having 4 or less carbon atoms.
  • a radical of an N-oxyl compound represented by the following formula 5, that is, azaadamantane-type nitroxy radical is also particularly preferable because uniform cellulose nanofibers can be produced in a short time.
  • R5 and R6 represent the same or different hydrogen or a C1-C6 linear or branched alkyl group.
  • the amount of N-oxyl compound such as TEMPO or 4-hydroxy TEMPO derivative used in oxidizing the cellulose-based material is not particularly limited as long as it is a catalytic amount capable of forming the cellulose-based material into nanofibers.
  • the amount is about 0.01 to 10 mmol, preferably about 0.01 to 1 mmol, and more preferably about 0.05 to 0.5 mmol, relative to 1 g of the cellulose-based raw material.
  • the bromide or iodide used in the oxidation of the cellulose-based material a compound which can be dissociated and ionized in water, for example, an alkali metal bromide or an alkali metal iodide can be used.
  • the amount of bromide or iodide used can be selected as long as the oxidation reaction can be promoted. For example, the amount is about 0.1 to 100 mmol, preferably about 0.1 to 10 mmol, and more preferably about 0.5 to 5 mmol, per 1 g of the cellulose-based raw material.
  • the oxidizing agent used in the oxidation of the cellulose-based material it is possible to promote the target oxidation reaction such as halogen, hypohalous acid, subhalic acid, perhalogen acid or salts thereof, halogen oxides, peroxides, etc.
  • Any oxidizing agent can be used as long as it is an oxidizing agent.
  • sodium hypochlorite which is inexpensive and has a low environmental impact, which is currently most widely used in industrial processes, is particularly preferable from the viewpoint of production cost.
  • the amount of the oxidizing agent used can be selected as long as the oxidation reaction can be promoted.
  • the amount is about 0.5 to 500 mmol, preferably about 0.5 to 50 mmol, and more preferably about 2.5 to 25 mmol, per 1 g of the cellulose-based raw material.
  • Oxidation of the cellulose-based material is carried out, as described above, in the presence of a compound selected from the group consisting of (1) N-oxyl compounds such as 4-hydroxy TEMPO derivatives, and (2) bromides, iodides and mixtures thereof. It is characterized in that the cellulose-based raw material is oxidized in water using an oxidizing agent such as sodium hypochlorite. This method is characterized in that the oxidation reaction of the cellulose-based material can proceed smoothly and efficiently even under mild conditions, so the reaction temperature may be room temperature of about 15 to 30.degree. In addition, since a carboxyl group produces
  • an alkaline solution such as an aqueous sodium hydroxide solution
  • a cellulose nanofiber can be manufactured by carrying out the conversion treatment and disentanglement.
  • mixing / stirring such as a high-speed shear mixer or a high pressure homogenizer, or an emulsification / dispersion device can be used singly or in combination of two or more kinds as needed.
  • cellulose nanofibers of relatively low viscosity can be efficiently produced. It is preferable because it can be done.
  • the amount of carboxyl groups in 1 g of completely dried cellulose nanofibers is 0.6 mmol / g or more, preferably 0.9 mmol / g or more, and more preferably 1.2 mmol / g or more. Some things are desirable.
  • the amount of carboxyl groups of cellulose nanofibers can be adjusted by changing the conditions of the above-mentioned oxidation reaction appropriately.
  • the amount of carboxyl groups of cellulose nanofibers is prepared by preparing 60 ml of 0.5 wt% slurry of cellulose nanofibers and adding 0.1 M hydrochloric acid aqueous solution to pH 2.5, and then 0.05 N aqueous sodium hydroxide solution Measure the electrical conductivity by dropping it until the pH reaches 11, and calculate it from the amount of sodium hydroxide (a) consumed in the neutralization stage of weak acid where the change in electrical conductivity is slow using the following formula Can.
  • Carboxyl group amount [mmol / g pulp] a [ml] x 0.05 / cellulose nanofiber weight [g]
  • a base paper is coated with a coating solution containing a pigment, an adhesive and cellulose nanofibers to provide a coated layer (also referred to as "pigment coated layer"), and as a preferred embodiment, A coated layer containing cellulose nanofibers is provided on the innermost layer adjacent to the base paper.
  • the blending amount of cellulose nanofibers in the coating layer is preferably 0.01 to 20 parts by weight, and more preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the pigment.
  • a single or 2 or more types of pigment can be used as needed in the range which does not impair the objective of invention, for example, kaolin, clay, the delamination Ted clay, engineered calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, inorganic pigments such as colloidal silica, satin white, organic pigments such as plastic pigments Pigments, organic-inorganic composite pigments, etc. may be mentioned.
  • a single or two or more types of adhesives can be used as long as the object of the invention is not impaired.
  • styrene butadiene type styrene acrylic type Bonding of various copolymers of ethylene, vinyl acetate, butadiene, methyl methacrylate, vinyl acetate, butyl acrylate, etc., or polyvinyl alcohol, maleic anhydride copolymer, acrylic acid, methyl methacrylate copolymer, etc.
  • soy proteins proteins such as synthetic proteins
  • oxidized starches positive starches
  • etherified starches such as urea phosphate esterified starch
  • hydroxyethyl etherified starches starches such as dextrin
  • carboxymethyl cellulose hydroxyethyl cellulose
  • hydroxy Cellulose derivatives such as methyl cellulose
  • the total amount of the adhesive to be used is preferably in the range of about 5 to 50 parts by weight, more preferably about 10 to 30 parts by weight with respect to 100 parts by weight of the pigment, from the viewpoint of printability and coatability.
  • auxiliary agents such as a dispersant, a thickener, a water retention agent, an antifoaming agent, a water resistance agent, a colorant and the like may be added, if necessary.
  • the coating method containing a pigment, an adhesive and cellulose nanofibers on a base paper may be a blade coater, bar coater, roll coater, air knife coater, reverse roll coater, curtain coater, 2 roll size press, gate roll coater
  • a rod metal ring size press, a spray coater or the like can be used, and one or two or more layers can be coated on the base paper on one side or both sides.
  • the coating amount of the coating liquid is determined in accordance with the desired properties, but in the case of the present invention, it is preferably 1 to 20 g / m 2 , more preferably 3 to 15 g / m 2 , and more preferably 3 to 15 g / m 2 . Good coverage and print quality can be obtained even with a coating amount as low as preferably 3 to 10 g / m 2 .
  • coated paper The coated paper obtained in this manner may be subjected to a calendering treatment such as a super calender, a gross calender, a soft calender, a hot soft calender, etc., as necessary.
  • a calendering treatment such as a super calender, a gross calender, a soft calender, a hot soft calender, etc.
  • good coverage can be obtained without calendering
  • coated paper having good printability such as ink receptivity can be obtained. Therefore, in the present invention, coated paper having good printability can be obtained regardless of the basis weight and coating amount.
  • the density of the coated paper of the present invention is determined according to the purpose and may be any density. It is applicable to coated paper having a density of 1.00 g / cm 3 or less, and further, coated paper having a low density of about 0.40 to 0.90 g / cm 3 , and
  • the coated paper of the present invention can be used as a coated paper for printing used for book paper, magazines, catalogs, posters, etc., a paperboard coated paper, and can also be used as a newspaper.
  • the coated paper of the present invention can be preferably used as a coated paper for printing for various printing machines, such as for offset printing, gravure printing, and letterpress printing.
  • Ink receptivity Obtained by printing at a printing speed of 8,000 sheets / hour using an A3 size plate and an offset printing ink (Hyunitity M made by Toyo Ink) on a Roland offset plain printer (4 colors)
  • the ink receptivity of the printed matter was visually evaluated in four steps. :: very good, ⁇ : good, ⁇ : slightly inferior, x: inferior (6)
  • Unevenness in glossiness The minute unevenness in glossiness on the surface of the printed matter was visually evaluated by a monitor of 10 people. ⁇ : extremely good, :: good, ⁇ : somewhat inferior, x: inferior.
  • oxidized powdered cellulose was separated by centrifugation (6000 rpm, 30 minutes, 20 ° C.), and sufficiently washed with water to obtain oxidized powdered cellulose.
  • a 2% (w / v) slurry of oxidized powdered cellulose is treated with a mixer at 12,000 rpm for 15 minutes, and the powdered cellulose slurry is further treated with an ultrahigh pressure homogenizer at a pressure of 140 MPa for 5 times. A liquid was obtained.
  • Example 1 Base material containing 100 parts of chemical pulp as paper pulp and 5 parts of light calcium carbonate as filler (weight: 56 g / m 2 , density 0.7 g / cm 3 ) on the surface, heavy calcium carbonate as pigment (Fimatec Co., Ltd.
  • Example 2 A coated paper was obtained in the same manner as in Example 1, except that the blending amount of cellulose nanofibers was changed to 0.05 parts.
  • Example 3 A coated paper was obtained in the same manner as in Example 1, except that the blending amount of cellulose nanofibers was changed to 5 parts.
  • Example 4 A coated paper was obtained in the same manner as Example 1, except that a cellulose nanofiber having a carboxyl group content of 0.5 mmol / g was used as the cellulose nanofibers.
  • the cellulose nanofiber whose carboxyl group weight is 0.5 mmol / g was manufactured by the following method. Add 15 kg (absolutely dried) of powdered cellulose (Nippon Paper Chemicals Co., Ltd., particle size 24 ⁇ m) to 500 L of an aqueous solution of 39 g (0.25 mol) of TEMPO (Sigma Aldrich) and 755 g (7 mol) of sodium bromide Stir until the powdered cellulose is uniformly dispersed. After adding 50 L of an aqueous solution of sodium hypochlorite (effective chlorine 5%) to the reaction system, the pH was adjusted to 10.3 with a 0.5 N aqueous solution of hydrochloric acid to start an oxidation reaction.
  • oxidized powdered cellulose was separated by centrifugation (6000 rpm, 30 minutes, 20 ° C.), and sufficiently washed with water to obtain oxidized powdered cellulose.
  • a 2% (w / v) slurry of oxidized powdered cellulose is treated with a mixer for 15 minutes at 12,000 rpm, and the obtained powdered cellulose slurry is treated 5 times with a pressure of 140 MPa with an ultrahigh pressure homogenizer to obtain a clear gel dispersion
  • a cellulose nanofiber dispersion was obtained.
  • Example 5 As the first innermost coating adjacent to the base paper, 80 parts of calcium carbonate (FMT-90 manufactured by Fimatech) and 20 parts of kaolin (Japan gloss manufactured by Huber) as a pigment, styrene-butadiene as an adhesive
  • a coating solution comprising 10 parts of copolymer type latex and 5 parts of hydroxyethyl etherified starch, and 0.5 parts of cellulose nanofibers having a carboxyl group weight of 1.2 mmol / g used in Example 1 was coated per side Apply 1 layer each to both sides of the base paper with a blade type coating machine so that the amount of work is 6 g / m 2 in solid content, and apply heavy carbon dioxide as a pigment as a second layer coating on it 80 parts of calcium (Fimatech's FMT-90) and 20 parts of kaolin (Huber's Japan gloss), styrene-butadiene copolymer type as an adhesive
  • the coating solution consisting of 10 parts tex and hydroxy
  • Example 6 Do not mix the cellulose nanofibers in the coating solution for the innermost first layer coating adjacent to the base paper, and as the second layer coating, as a pigment, heavy calcium carbonate (FMT-90 manufactured by Fimatech Co., Ltd.) 50 parts and 50 parts of kaolin (Japan Gross manufactured by Huber), 10 parts of styrene-butadiene copolymer latex as an adhesive, 5 parts of hydroxyethyl etherified starch, and the amount of carboxyl group used in Example 1 1.2 mmol / g A coated paper was obtained in the same manner as Example 5, except that a coating liquid consisting of 0.5 parts of cellulose nanofibers was coated and dried.
  • FMT-90 manufactured by Fimatech Co., Ltd. 50 parts and 50 parts of kaolin (Japan Gross manufactured by Huber), 10 parts of styrene-butadiene copolymer latex as an adhesive, 5 parts of hydroxyethyl etherified starch, and the amount of carboxy
  • Example 7 A coated paper was obtained in the same manner as in Example 1 except that the coating amount per one side was changed to 6 g / m 2 in solid content.
  • Example 8 On the surface of base paper containing 100 parts of chemical pulp as paper pulp and 10 parts of light calcium carbonate as filler (basis weight 70 g / m 2 , density 0.75 g / cm 3 ), the innermost first layer adjacent to the base paper 100 parts of heavy calcium carbonate (FMT-90 manufactured by Fimatech Co., Ltd.) as a pigment, 9 parts of a styrene-butadiene copolymer type latex and 5 parts of a hydroxyethyl etherified starch as an adhesive, and used in Example 1 A coating solution consisting of 0.5 parts of cellulose nanofibers having a carboxyl group content of 1.2 mmol / g was treated with a blade type coating machine so that the coating amount per one side was 8 g / m 2 in solid content.
  • FMT-90 heavy calcium carbonate
  • One layer is coated and dried on both sides of the base paper, and on top of that, 80 parts of heavy calcium carbonate (FMT-90 manufactured by Fimatech Co., Ltd.) as a second layer is applied.
  • a coating solution consisting of 20 parts of kaolin (Huber's Japan Gloss), 10 parts of a styrene-butadiene copolymer latex as an adhesive, and 5 parts of hydroxyethyl etherified starch was coated at a coating weight of 8 g / solid on one side.
  • Example 2 After coating and drying one by one on the both sides with a blade type coating machine so as to be m 2 , the calendering was carried out under the conditions of a linear pressure of 200 kg / cm and a calender nip number of 4 with a test super calender A coated paper was obtained in the same manner as in Example 1.
  • Comparative Example 1 A coated paper was obtained in the same manner as in Example 1 except that the cellulose nanofibers were not blended in the coating liquid.
  • Comparative Example 2 A coated paper was obtained in the same manner as Example 6, except that the cellulose nanofibers were not blended in the coating liquid.
  • Comparative Example 3 A coated paper was obtained in the same manner as Example 8, except that the cellulose nanofibers were not blended in the coating liquid.
  • the coated papers for printing of Examples 1 to 6 coated with the coating liquid containing cellulose nanofibers have lower density and smoothness and print gloss than the coated papers of Comparative Example 1.
  • the ink receptivity is good, and the gloss unevenness is small.
  • Example 7 in which the coating amount of the pigment coating liquid is small the white paper glossiness and the printing glossiness are high, the low density and the smoothness are high, and the ink adhesion is high compared to Comparative Example 2 of the same coating amount. It can be seen that the fleshiness is good and the gloss unevenness is small.
  • Example 8 Even in the case of coated paper having relatively high density, when a coating liquid containing cellulose nanofibers is applied, smoothness, print glossiness is high, and ink receptivity is good, It can be seen that coated paper with less gloss unevenness can be obtained.

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Abstract

L'invention porte sur un papier couché hautement approprié pour l'impression, lequel papier présente un lissé élevé, donne un bon brillant d'impression et provoque peu d'irrégularités dans le brillant d'imprimés. Un papier couché pour l'impression comporte au moins une couche de revêtement, qui contient un pigment et un adhésif, sur un papier de base, la couche de revêtement renfermant de plus des nanofibres de cellulose.
PCT/JP2010/055400 2009-03-31 2010-03-26 Papier couché WO2010113805A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011507155A JPWO2010113805A1 (ja) 2009-03-31 2010-03-26 塗工紙

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
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JP2014009414A (ja) * 2012-06-29 2014-01-20 Nippon Paper Industries Co Ltd セルロースナノファイバーの製造方法
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