WO2011007775A1 - 印刷用塗工紙 - Google Patents
印刷用塗工紙 Download PDFInfo
- Publication number
- WO2011007775A1 WO2011007775A1 PCT/JP2010/061832 JP2010061832W WO2011007775A1 WO 2011007775 A1 WO2011007775 A1 WO 2011007775A1 JP 2010061832 W JP2010061832 W JP 2010061832W WO 2011007775 A1 WO2011007775 A1 WO 2011007775A1
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- WIPO (PCT)
- Prior art keywords
- paper
- printing
- ink
- coating layer
- colloidal silica
- Prior art date
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Classifications
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- 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
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
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- 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
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- 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
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- 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
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- 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
- B41M5/52—Macromolecular coatings
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- 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
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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- 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
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
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- 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
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- 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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
Definitions
- the present invention relates to a coated paper for printing used in a printing machine using an inkjet recording method.
- a coated paper for printing having gloss.
- Inkjet recording technology has advanced rapidly, and it has become possible to form color and high-quality images on recording media such as paper and film by printers that use the inkjet recording method.
- Printers that use such an ink jet recording system include small printers for home use and large format printers used by printers and the like. Basically, these printers are used mainly in a small number of printing sites in order to perform printing in units of one sheet.
- inkjet printing In recent years, application to commercial printing (hereinafter referred to as “inkjet printing”) using an inkjet recording method has begun due to further technological advances. In the commercial printing field, the number of copies is large, and printing speed is emphasized from the viewpoint of productivity and printing cost.
- a printing speed suitable for inkjet printing is achieved by a printing machine (hereinafter referred to as “inkjet printing machine”) having a line head in which the head for ejecting ink is fixed in the entire width direction perpendicular to the paper conveyance direction. (For example, see Patent Document 1). Recently, a rotary inkjet printer has also been developed.
- a rotary inkjet printer has been developed that has a printing speed of 15 m / min or higher, a speed of 60 m / min or higher at a higher speed, and a speed of 120 m / min or higher at a higher speed.
- inkjet printers can handle variable information, they are especially applied to on-demand printing.
- fixed information is printed by an offset printer and variable information is printed by an inkjet printer.
- PPC paper or non-coated paper has been used as paper for inkjet printers.
- it has the same texture as printing paper such as general-purpose A2 mat coated paper and A2 gloss coated paper, and can be used for inkjet printers.
- printing paper such as general-purpose A2 mat coated paper and A2 gloss coated paper
- the defective diffusion of dots is a phenomenon in which the spread of the ink in the surface direction is insufficient in the process in which the inkjet ink collides and is absorbed by the coated paper for printing. Due to the poor diffusion of dots, streaky areas, i.e., white streaks, in which the overlap of ink is insufficient are generated in the printed image. Therefore, it is necessary to suppress dot diffusion failure.
- the poor scratch resistance is a phenomenon in which ink is detached by rubbing the printed part of the printing coated paper with something. The printed image is smudged due to poor scratch resistance. Therefore, it is required to improve the scratch resistance.
- a recording medium in which the base paper has an ink absorption amount of 1.5 times or more of the coating layer see, for example, Patent Document 2
- a specific moisture content and a CD / MD direction there is a rigid recording medium (for example, see Patent Document 3) and a recording medium having a specific water absorption (for example, see Patent Document 4) in which a base layer is provided with a binder layer and a second layer containing kaolin and polyvinyl alcohol.
- a base layer is provided with a binder layer and a second layer containing kaolin and polyvinyl alcohol.
- A4 size printing time per sheet is 1 second or less, which is overwhelming high-speed printing compared to large-format inkjet printers and home inkjet printers. Therefore, the coated paper for printing is required to have a quality corresponding to the ink jet printer. That is, until the ink is landed on the printing paper and wound on the rotary press or overlapped on the paper discharge tray on the sheet-fed press, the strength of the coating layer, the quick absorption of the ink, the reliable fixing of the ink, Suppression of dot diffusion failure on the printing paper surface of the landed ink is required.
- the printed portion of the printed material is required to have excellent scratch resistance and performance such as excellent ink adhesion so that the ink fixed on the coated paper for printing does not peel off.
- glossy paper does not have a coated paper for printing having such performance.
- Inkjet printer paper provided with an ink-receiving layer is excellent in ink absorbability, but the ink absorbability is too good, so that the landed ink droplets do not spread much, resulting in poor dot diffusion. As a result, white streaks occur in the printed part. Therefore, with general-purpose printing paper or paper dedicated for inkjet printers, it is impossible to obtain ink fixing properties, ink absorbability, suppression of dot diffusion failure, or scratch resistance of the printed portion corresponding to the inkjet printer.
- An object of the present invention is a coated paper for use in an ink jet printer, having ink fixing properties and ink absorbability corresponding to ink jet printing, suppressing dot diffusion failure, and scratch resistance of a printed portion. It is to provide a coated paper excellent in printing.
- the base paper is at least a cation in an undercoat layer containing a pigment and a binder on at least one surface of the base paper, and one or more coating layers on the undercoat layer. Containing at least one selected from a functional resin and a polyvalent cation salt, the uppermost coating layer contains at least colloidal silica, and has a 75 ° glossiness defined by JIS Z8741 on the surface of the uppermost coating layer. This is achieved with a coated paper for printing that is 40% or more.
- the ink absorbability when the contact time of the base paper is 30 seconds is 60 g / m 2 or more, the ink absorbability can be further improved or the dot diffusion failure can be suppressed.
- the scratch resistance can be further improved.
- the ink fixing property when the glass transition temperature of the synthetic resin constituting the colloidal silica composite synthetic resin is 50 ° C. or more, the ink fixing property can be further improved or the scratch resistance of the printed portion can be improved.
- the uppermost coating layer contains a water-dispersible binder, and the glass transition temperature of the water-dispersible binder is lower than the glass transition temperature of the synthetic resin constituting the colloidal silica composite synthetic resin.
- a coated paper for printing in which an undercoat layer containing a pigment and a binder is provided on at least one surface of a base paper, and one or more coating layers are provided on the undercoat layer, ion-exchanged water is used.
- Dropping when 1 ⁇ l of a mixed solution of ion-exchanged water and glycerin (ion-exchanged water / glycerin 8/2) is dropped on the surface of the uppermost coating layer in the printing paper having the above contact angle.
- the remaining droplet volume ratio after 1.5 seconds is 75% or more and 100% or less, and the remaining droplet volume ratio after 10 seconds after dropping is 60% or more and 85% or less. Scratchability can be improved or dot diffusion failure can be suppressed.
- a printing method using an inkjet printer the step of obtaining the above-mentioned coated paper for printing, and inkjet printing using a pigment ink on the coating layer of the coated paper for printing.
- a method including a step of forming a printed image at a printing speed of 15 m / min or more.
- the present invention is also a method for forming an excellent printed image, the step of obtaining the above-mentioned coated paper for printing, and the formation of the printed image on the coating layer of the coated paper for printing using an inkjet printer.
- a method comprising the steps of:
- an ink jet printer that employs pigment ink can obtain scratch resistance of the printed portion, and can obtain a coated paper for printing that suppresses dot diffusion failure and prevents the occurrence of white streaks.
- the base paper includes chemical pulps such as LBKP and NBKP, mechanical pulps such as GP, PGW, RMP, TMP, CTMP, CMP, and CGP, and waste paper pulps such as DIP, light calcium carbonate, heavy calcium carbonate, and talc. , Clay, kaolin and other fillers, sizing agents, fixing agents, retention agents, cationic resins such as cationic resins and polyvalent cation salts, and other additives such as paper strength agents. Paper made of neutral or alkaline paper can be used.
- pigment dispersant in the base paper stock in the present invention, as other additives, pigment dispersant, thickener, fluidity improver, antifoaming agent, foam suppressor, mold release agent, foaming agent, penetrating agent, coloring dye, Color pigments, fluorescent brighteners, ultraviolet absorbers, antioxidants, preservatives, antibacterial agents, water resistance agents, wet paper strength enhancers, dry paper strength enhancers and the like that do not impair the desired effects of the present invention Thus, it can be appropriately blended.
- the base paper used in the present invention contains at least one selected from a cationic resin and a polyvalent cation salt in advance.
- the coated paper for printing can have ink fixing properties and ink absorbability suitable for inkjet printing. The reason is not clear, but when an undercoat layer is provided on the base paper, the coating liquid loosely aggregates in the vicinity of the interface between the base paper and the undercoat layer coating liquid, and the vicinity of the base paper of the undercoat layer has a porous structure. it is conceivable that.
- the cationic resin is generally used such as a cationic polymer or a cationic oligomer that dissociates and exhibits a cationic property when dissolved in water, and the type thereof is not particularly limited. Polymers or oligomers containing primary to tertiary amines or quaternary ammonium salts that dissociate and become cationic when dissolved in water are preferred.
- polyethyleneimine polyvinyl pyridine, polyamine sulfone, polydialkylaminoethyl methacrylate, polydialkylaminoethyl acrylate, polydialkylaminoethyl methacrylamide, polydialkylaminoethyl acrylamide, polyepoxyamine, polyamidoamine, dicyandiamide- Formalin condensate, dicyandiamide polyalkyl-polyalkylene polyamine condensate, compounds such as polyvinylamine, polyallylamine and their hydrochlorides, polydiallyldimethylammonium chloride and copolymers of diallyldimethylammonium chloride and acrylamide, polydiallyl Methylamine hydrochloride, dimethylamine-ammonia-epichlorohydrin condensate, dimethyl Min - can be exemplified epichlorohydrin condensates, and the like.
- a polyvalent cation salt is a salt containing a water-soluble polyvalent cation, and preferably a polyvalent cation that can be dissolved in water at 20 ° C. in an amount of 1% by mass or more. It refers to a salt containing salt.
- polyvalent cations include divalent cations such as magnesium, calcium, strontium, barium, nickel, zinc, copper, iron, cobalt, tin and manganese, and trivalent cations such as aluminum ion, iron and chromium. Ions, or tetravalent cations such as titanium and zirconium, and complex ions thereof.
- the anion that forms a salt with the polyvalent cation may be either an inorganic acid or an organic acid, and is not particularly limited.
- Inorganic acids include, but are not limited to, hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, boric acid, hydrofluoric acid, and the like.
- organic acids include, but are not limited to, formic acid, acetic acid, lactic acid, citric acid, oxalic acid, succinic acid, and organic sulfonic acid.
- Preferred polyvalent cation salts include magnesium chloride, calcium chloride and the like.
- the amount of the cationic resin or polyvalent cation salt contained in the base paper is preferably in the range of 0.1 g / m 2 to 5 g / m 2 in terms of dry solid content per side. Moreover, although it may be more than this range, since the effect beyond it is not acquired, it is unpreferable from the point of cost.
- a method of adding a cationic resin or a polyvalent cation salt to the base paper a method of making a paper after adding a cationic resin or a polyvalent cation salt to the base paper stock, a cationic resin or a polyvalent cation to the base paper There is a method of applying or impregnating a cation salt.
- a method of coating or impregnating the base paper with a cationic resin or a polyvalent cation salt is preferable.
- coating in addition to a size press, a gate roll coater, and a film transfer coater, coating can be performed by various coating machines such as a blade coater, a rod coater, an air knife coater, and a curtain coater. From the viewpoint of production cost, it is preferable to perform coating on-machine such as a size press, gate roll coater, or film transfer coater installed in a paper machine.
- the sizing degree of the base paper can be adjusted and controlled by the addition amount of the internal sizing agent at the time of making the base paper, the application amount of the surface sizing agent by size press treatment, the coating amount of the coating layer, and the like.
- the sizing degree of the base paper can be expressed as Cobb water absorption. When the Cobb water absorption increases, the size decreases.
- the internal sizing agent is, for example, rosin sizing agent for acidic paper, alkenyl succinic anhydride, alkyl ketene dimer, neutral rosin sizing agent or cationic styrene-acrylic sizing agent for neutral paper. .
- the surface sizing agent examples include a styrene-acrylic sizing agent, an olefin sizing agent, and a styrene-maleic sizing agent.
- a cationic or nonionic surface sizing agent is preferable.
- the content of the sizing agent in the base paper is preferably 0.01 to 1.0% by mass, more preferably 0.03 to 0.8% by mass, based on the pulp mass.
- the coating amount of the surface sizing agent applied to the base paper is preferably 0.01 g / m 2 to 1.0 g / m 2 , more preferably 0.02 g / m 2 to 0.5 g / m 2. It is.
- the Cobb water absorption of the base paper according to JIS P8140 when the contact time between the base paper and water is 30 seconds is preferably 60 g / m 2 or more. More preferably, the Cobb water absorption is 100 g / m 2 or more. By setting it within this range, it is possible to further improve the ink absorbability and suppress the dot diffusion failure.
- the thickness of the base paper of the present invention is not particularly limited, but is 50 to 300 ⁇ m, preferably 80 to 250 ⁇ m.
- an undercoat layer is provided on a base paper containing at least one selected from a cationic resin and a polyvalent cation salt, and the uppermost coating layer contains at least colloidal silica.
- the uppermost coating layer refers to the outermost coating layer as viewed from the base paper.
- the base paper contains a cationic resin or a polyvalent cation salt
- the undercoat layer on the base paper forms a porous structure
- the uppermost coating layer contains colloidal silica to form uniform and dense voids. Form. Due to these combined effects, it is considered that the coated paper for printing has ink absorbability and ink fixability compatible with an ink jet printer, further suppresses dot diffusion failure, and provides scratch resistance of the printed portion. .
- the colloidal silica used for the uppermost coating layer is an ultrafine silica sol dispersed in water in a colloidal form, and generally known colloidal silica can be used.
- the average particle diameter of colloidal silica is preferably in the range of 5 nm to 80 nm, and more preferably in the range of 10 nm to 50 nm. If the average particle size of the colloidal silica is less than 5 nm, the ink absorbability may decrease, and if it exceeds 80 nm, the suppression of defective dot diffusion may be insufficient.
- the average particle size is an average particle size based on a particle size distribution measurement based on volume using a laser diffraction / scattering method or a dynamic light scattering method.
- the average particle diameter is 3 ⁇ m or more
- the average particle diameter is based on the Coulter counter method. For example, it can be measured using a laser diffraction / scattering type particle size distribution measuring instrument Microtrac MT3000II manufactured by Nikkiso Co., Ltd.
- the uppermost coating layer can contain a colloidal silica composite synthetic resin as colloidal silica.
- the uppermost coating layer contains a colloidal silica composite synthetic resin, whereby the scratch resistance of the printed portion can be further increased.
- the colloidal silica composite synthetic resin contained in the coating layer is disclosed in JP-A-59-71316, JP-A-59-152972, JP-A-60-127371, and JP-A-3599677. Is disclosed.
- the colloidal silica composite synthetic resin has a structure in which colloidal silica having an average particle size of 5 nm to 80 nm is bonded to the surface of synthetic resin particles having an average particle size of 10 nm to 100 nm. It is distinguished from containing colloidal silica and synthetic resin particles individually in that the colloidal silica and the synthetic resin particles are chemically bonded.
- the synthetic resin comprises a radical polymerizable unsaturated monomer having a silyl group and a copolymerizable radical polymerizable unsaturated monomer having no silyl group in the presence of a surfactant.
- a surfactant Can be obtained by emulsion polymerization.
- Emulsion polymerization is performed in an aqueous medium with the addition of a polymerization initiator.
- a polymerization initiator e.g., ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium
- emulsion polymerization For the emulsion polymerization, a known emulsion polymerization method can be used. For example, batch polymerization method in which each component is charged into a reaction can and polymerized at once, and a part of the monomer is initially polymerized in an aqueous medium containing an emulsifier, and then the remaining emulsifier and monomer are dropped to polymerize.
- Various polymerization methods such as a dropping polymerization method or an emulsion monomer dropping method in which a component to be dropped is preliminarily emulsified and dispersed in water can be used.
- an emulsion polymerization method for obtaining a synthetic resin of a colloidal silica composite synthetic resin used in the present invention it is preferable to use an emulsion monomer dropping method in order to obtain a fine particle synthetic resin.
- the multistage polymerization method in which the monomer composition in the polymerization stage is changed stepwise, the power feed polymerization method in which the monomer composition is changed as needed, or the seed polymerization method in which a seed is added as a nucleus Can also be used in appropriate combination.
- radical polymerizable unsaturated monomer having a silyl group for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinyldimethylmethoxysilane, vinyltriacetoxysilane, vinyltrichlorosilane, Examples include vinyltris (2-methoxyethoxy) silane, 3- (meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, 3- (meth) acryloxypropylmethyldimethoxysilane, and the like. These unsaturated monomers may be used individually by 1 type, and may use 2 or more types together.
- Preferred radical polymerizable unsaturated monomers having a silyl group include vinyltriethoxysilane, 3- (meth) acryloxypropyltrimethoxysilane, and 3- (meth) acryloxypropyltriethoxysilane from the viewpoint of polymerizability. Is mentioned.
- the amount of the radical polymerizable unsaturated monomer having a silyl group used in the polymerization reaction is 100 parts by mass of the total radical polymerizable unsaturated monomer (including the radical polymerizable surfactant described later) used. It is preferably 0.1 parts by mass or more and 15 parts by mass or less, more preferably 0.5 parts by mass or more and 10 parts by mass or less.
- the amount of the radically polymerizable unsaturated monomer having a silyl group is less than 0.1 part by mass, the composite of the synthetic resin and the colloidal silica may be insufficient. If it exceeds 15 parts by mass, destabilization of polymerization, generation of aggregates, increase in viscosity of the reaction solution, etc.
- the silanol group of the colloidal silica and the synthetic resin can be coupled, and the colloidal silica and the synthetic resin are chemically To form a colloidal silica composite synthetic resin.
- the copolymerizable radical polymerizable unsaturated monomer having no silyl group is, for example, an alkyl group such as methyl, ethyl, n-butyl, t-butyl, propyl, 2-ethylhexyl, octyl or the like.
- (meth) acrylic acid in combination with at least one selected from the group consisting of ethyl acrylate, butyl acrylate, methyl methacrylate, styrene, and 2-ethylhexyl acrylate.
- the glass transition temperature (hereinafter also referred to as Tg) of the synthetic resin constituting the colloidal silica composite synthetic resin is preferably 50 ° C. or higher, and more preferably 70 ° C. or higher.
- Tg is 50 ° C. or more, ink fixability and scratch resistance of the printed portion can be obtained more than those compatible with an ink jet printer.
- Tg is determined by measuring with a differential scanning calorimeter (DSC) such as EXSTAR 6000 (manufactured by Seiko Denshi), DSC220C (manufactured by Seiko Denshi Kogyo), DSC-7 (manufactured by Perkin Elmer), etc. Can do.
- DSC differential scanning calorimeter
- the glass transition phenomenon is observed as a shift of the baseline toward the endothermic direction, and the intersection between the baseline and the endothermic peak slope is defined as Tg.
- the glass transition temperature of the synthetic resin constituting the colloidal silica composite synthetic resin includes a monomer that forms a polymer having a relatively low Tg and a monomer that forms a polymer having a relatively high Tg. It can adjust by preparing a synthetic resin in combination.
- the monomer that forms a polymer having a relatively low glass transition temperature include ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like.
- Examples of the monomer that forms a polymer having a relatively high Tg include acrylic acid, methacrylic acid, methyl methacrylate, styrene, cyclohexyl acrylate, and cyclohexyl methacrylate.
- the surfactant used in emulsion polymerization functions as an emulsifier during emulsion polymerization.
- a normal anionic, cationic or nonionic surfactant can be used as the surfactant used in the emulsion polymerization.
- a radically polymerizable surfactant having one or more unsaturated groups capable of radical polymerization in the molecule can be preferably used.
- the radical polymerizable surfactant can be copolymerized with the monomer during emulsion polymerization due to the presence of a polymerizable unsaturated bond in the molecule.
- the surfactant does not remain after emulsion polymerization, which is preferable because it does not bleed out to the surface of the film as a free surfactant when the coating layer is formed, and does not inhibit ink absorbability.
- Such radically polymerizable surfactant can be appropriately selected from known substances.
- the synthetic resin constituting the colloidal silica composite synthetic resin is in the form of particles, and the average particle diameter of the synthetic resin particles is preferably 10 nm or more and 100 nm or less. If the average particle size of the synthetic resin particles is less than 10 nm, the particle size of the resulting colloidal silica composite synthetic resin is reduced, so that the surface porosity is lowered, and the ink absorbability may be lowered. If the average particle diameter is more than 100 nm, the particle diameter of the colloidal silica composite synthetic resin obtained on the contrary is excessively large, so that the surface porosity becomes excessive and dot diffusion failure may occur.
- the average particle size of the synthetic resin particles is more preferably 20 nm or more and 80 nm or less.
- the colloidal silica composite synthetic resin is obtained by mixing the synthetic resin obtained above with stirring in the presence of colloidal silica, and heating the mixture as necessary to heat the silyl group of the synthetic resin and the silanol group of the colloidal silica.
- the colloidal silica constituting the colloidal silica composite synthetic resin is an ultrafine silica sol dispersed in water in a colloidal manner, similar to the above colloidal silica, and generally known colloidal silica can be used.
- the average particle diameter of the colloidal silica is preferably 5 nm or more and 80 nm or less. By making the average particle diameter within this range, the synthetic resin can be bound so that the colloidal silica is completely covered. More preferably, the average particle size is 10 nm or more and 50 nm or less.
- the average particle size of the colloidal silica composite synthetic resin is preferably 20 nm or more and 300 nm or less. More preferably, it is 50 nm or more and 200 nm or less.
- colloidal silica a commercially available product can be used both in the case of colloidal silica used alone and in the case of colloidal silica constituting the colloidal silica composite synthetic resin.
- Colloidal silica surface-treated with metal ions such as metaaluminate ions can also be used.
- the shape of the colloidal silica may be single particle colloidal silica, or may be colloidal silica in which particles are connected in a beaded manner or branched by a special treatment.
- Colloidal silica surface-treated with a metal ion such as metaaluminate ion is preferable in that it has excellent mixing stability and is difficult to aggregate.
- the uppermost coating layer of the present invention can contain other pigments in addition to colloidal silica and colloidal silica composite synthetic resin.
- pigments can be used as other pigments.
- the content of the colloidal silica contained in the uppermost coating layer is preferably 40% by mass or more, more preferably 45% by mass or more, based on the total pigment contained in the uppermost coating layer. .
- the uppermost coating layer can contain various known binders.
- the binder to be contained an aqueous binder having a medium as water is preferable.
- Water-based binder means a water-soluble binder or a water-dispersible binder.
- the water-soluble binder include starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch, cellulose derivatives such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose, polyvinyl alcohol derivatives such as polyvinyl alcohol and silanol-modified polyvinyl alcohol, Casein, gelatin or modified products thereof, soy protein, pullulan, gum arabic, Karaya gum, albumin and other natural polymer resins or derivatives thereof, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, alginic acid, polyethyleneimine, polypropylene glycol, polyethylene Examples thereof include, but are not limited to, glycol, maleic anhydride or a copolymer thereof.
- water-dispersible binder examples include conjugated diene copolymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, a polymer of acrylate ester or methacrylate ester, or a copolymer thereof.
- Acrylic copolymer latex, vinyl copolymer latex such as ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyurethane resin latex, alkyd resin latex, unsaturated polyester resin latex, or various of these Examples include, but are not limited to, latex binders such as functional group-modified copolymer latexes with functional group-containing monomers such as carboxy groups of the copolymer, and thermosetting synthetic resins such as melamine resins and urea resins. These aqueous binders can be used alone or in admixture of two or more.
- a water-dispersible binder is preferable from the viewpoint of obtaining ink absorbability and ink fixability corresponding to an ink jet printer, and among them, styrene-butadiene copolymer or methyl methacrylate-butadiene copolymer is preferable.
- the Tg of the water-dispersible binder is preferably lower than the Tg of the synthetic resin constituting the colloidal silica composite synthetic resin.
- a more preferred water-dispersible binder is a styrene-butadiene copolymer or methyl methacrylate-butadiene copolymer having a Tg lower than that of the synthetic resin constituting the colloidal silica composite synthetic resin.
- the Tg of the binder can be adjusted by selecting the monomer and changing the blending ratio of the monomer to be copolymerized.
- the content of the total binder in the uppermost coating layer is 60% by mass or less based on the total solid content of the uppermost coating layer from the viewpoint of ink absorbability corresponding to an ink jet printer and suppression of defective diffusion of dots. , Preferably 30% by mass or less, more preferably 15% by mass or less.
- the contact angle of the coating layer surface is preferably 55 ° to 85 ° after 0.1 seconds of contact with the mixed solution, and preferably 25 ° to 45 ° after contact 1.5 seconds.
- the coated paper can obtain better ink fixing properties and ink absorbability, or suppression of dot diffusion failure with respect to the ink jet printer. If the contact angle value is out of the above range, the effect of the present invention cannot be obtained in any of these ink jet printing suitability.
- An ink-jet ink is an aqueous solution containing a coloring material using water as a medium, and generally contains an anti-drying agent such as glycerin.
- An example of such a contact angle measuring device is an automatic contact angle meter CA-VP300 (manufactured by Kyowa Interface Science Co., Ltd.).
- 1 ⁇ l of droplets may be in the range of 1 ⁇ ⁇ 20%, and there is no problem in measurement within this range.
- the residual droplet volume ratio is the surface of the coating layer in a specific time range when a predetermined droplet is dropped on the coating layer as shown in the following formula (1).
- Residual droplet volume ratio (%) ⁇ (Residual droplet volume V t on the coating layer surface after dropping t seconds) / (Dropped droplet volume) ⁇ ⁇ 100
- the remaining droplet volume can be calculated by the following formula (2) from the droplet radius and the droplet height measured from the image analysis data using a commercially available contact angle measuring device.
- 1 ⁇ l of droplets may be in the range of 1 ⁇ ⁇ 20%, and there is no problem in measurement within this range.
- V t ⁇ ⁇ (r t ⁇ r t ⁇ h t / 2 + h t ⁇ h t ⁇ h t / 6)
- V t Volume of remaining droplet [ ⁇ l] on the surface of the coating layer after elapse of t seconds after dropping
- ⁇ Circumference ratio
- r t Droplet radius ( ⁇ m) on the coating layer surface after elapse of t seconds to be measured
- h t droplet height ( ⁇ m) on the surface of the coating layer after elapse of t seconds to be measured
- An example of such a contact angle measuring device is an automatic contact angle meter CA-VP300 (manufactured by Kyowa Interface Science Co., Ltd.).
- the method for adjusting the contact angle or residual droplet volume ratio of the uppermost coating layer to the above range includes: coating amount, pigment type, pigment average particle size, pigment particle size distribution, pigment This is achieved by combining various conditions such as the shape of the pigment, the oil absorption of the pigment, the type of resin as the binder, the molecular weight or the degree of polymerization, the mixing of the water-dispersible binder and the water-soluble binder, the mixing ratio thereof, and the content ratio of the pigment and the binder. be able to.
- a method of adjusting the contact angle or the remaining droplet volume ratio of the uppermost coating layer to the above range (1) a combination of a flat or spherical pigment and an amorphous pigment ( 2) containing colloidal silica having an average particle diameter of 100 nm or less, (3) increasing the content ratio of a flat or spherical pigment, (4) containing a colloidal silica composite synthetic resin, (5) 100 parts by mass of pigment.
- the binder may be 5 parts by mass or more and 35 parts by mass or less, (6) increase the content ratio of the water-dispersible binder in the total binder in the coating layer, and (7) weaken the calendar process. be able to.
- the contact angle or the remaining droplet volume ratio satisfying the above range is achieved by using these methods alone or in combination, but is not limited to these methods.
- the coating amount of the uppermost layer of the coating layer as dry solids 3 g / m 2 or more 12 g / m 2 or less, more preferably 4g / m 2 or more 10 g / m 2 or less.
- the uppermost coating layer can contain a cationic resin or a polyvalent cation salt as required in order to further obtain ink fixing properties, ink absorbability, or suppression of defective diffusion of dots.
- the cationic resin that can be contained in the uppermost coating layer is the same as the cationic resin used for the base paper, such as cationic polymers and cationic oligomers that dissociate and become cationic when dissolved in water.
- the type is not particularly limited.
- the polyvalent cation salt that can be contained in the uppermost coating layer is a water-soluble polyvalent cation salt similar to the polyvalent cation salt used for the base paper, and is 1% by mass or more in water at 20 ° C. A salt containing a polyvalent cation salt that can be dissolved.
- the kind is not particularly limited.
- the uppermost coating layer includes additives such as ink fixing agents, pigment dispersants, thickeners, fluidity improvers, surfactants, antifoaming agents, and antifoaming agents.
- additives such as ink fixing agents, pigment dispersants, thickeners, fluidity improvers, surfactants, antifoaming agents, and antifoaming agents.
- An agent, a dry paper strength enhancer, and the like can be appropriately blended.
- a commonly used coating method can be used, and it is not particularly limited.
- the coating apparatus used in the coating method include an air knife coater, a blade coater, a roll coater, a bar coater, a rod blade coater, a curtain coater, and a short dwell coater.
- a blade coater, an air knife coater, and a curtain coater are preferable.
- the 75 ° glossiness defined by JIS Z8741 on the surface of the coating layer is 40% or more, preferably 60% or more and 90% or less. If it is this range, the glossiness close
- the gloss can be adjusted by the content or coating amount of colloidal silica in the uppermost coating layer, or by adding a pigment other than colloidal silica, such as colloidal alumina. Moreover, a higher glossiness can be obtained by performing a calendar process. Examples of the calendar processing apparatus at that time include a machine calendar, a super calendar, and a soft nip calendar. Moreover, it can also give gloss using the well-known cast coat method.
- one or more pigments are provided between the uppermost coating layer and the undercoat layer as necessary to achieve the purpose of adjusting the surface quality and glossiness. Further, an intermediate coating layer containing a binder may be provided.
- pigments used for the intermediate coating layer.
- one or more conventionally known pigments can be used.
- calcium carbonate, kaolin, and synthetic amorphous silica are preferable from the viewpoint of ink absorbability and gloss.
- the aqueous binder is a water-soluble binder or a water-dispersible binder.
- the water-soluble binder include starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch, cellulose derivatives such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose, polyvinyl alcohol derivatives such as polyvinyl alcohol and silanol-modified polyvinyl alcohol, Casein, gelatin or modified products thereof, soy protein, pullulan, gum arabic, Karaya gum, albumin and other natural polymer resins or derivatives thereof, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, alginic acid, polyethyleneimine, polypropylene glycol, polyethylene Examples thereof include, but are not limited to, glycol, maleic anhydride or a copolymer thereof.
- water-dispersible binder examples include conjugated diene copolymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, a polymer of acrylate ester or methacrylate ester, or a copolymer thereof.
- Acrylic copolymer latex, vinyl copolymer latex such as ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyurethane resin latex, alkyd resin latex, unsaturated polyester resin latex, or various of these Examples include, but are not limited to, latex binders such as functional group-modified copolymer latexes with functional group-containing monomers such as carboxy groups of the copolymer, and thermosetting synthetic resins such as melamine resins and urea resins. These aqueous binders can be used alone or in admixture of two or more.
- the binder blending amount in the intermediate coating layer is 5% by mass or more and 25% by mass with respect to the pigment contained in the intermediate coating layer from the viewpoint of ink absorbability corresponding to an ink jet printer and suppression of defective diffusion of dots.
- the following is preferred. More preferably, it is 7 mass% or more and 20 mass% or less.
- the intermediate coating layer contains additives such as ink fixing agents, pigment dispersants, thickeners, fluidity improvers, printability improvers, surfactants, antifoaming agents, and foam inhibitors.
- additives such as ink fixing agents, pigment dispersants, thickeners, fluidity improvers, printability improvers, surfactants, antifoaming agents, and foam inhibitors.
- Agent, mold release agent, foaming agent, penetrating agent, coloring dye, coloring pigment, fluorescent whitening agent, UV absorber, antioxidant, preservative, antibacterial agent, water resistant agent, wet paper strength enhancer, dry paper A force enhancer etc. can be mix
- the method of applying the intermediate coating layer can be any commonly used coating method and is not particularly limited. Examples thereof include an air knife coater, a blade coater, a roll coater, a bar coater, a rod blade coater, a curtain coater, and a short dwell coater. A blade coater, an air knife coater, and a curtain coater are preferable.
- the coating amount of the intermediate coating layer is preferably in the range of 3 g / m 2 or more and 20 g / m 2 or less as a dry solid content.
- an undercoat layer containing a pigment and a binder is provided on the surface of the base paper on which the coating layer is provided as at least one surface.
- the pigment used for the undercoat layer is preferably a pigment having no porosity.
- the presence or absence of porosity can be represented by a BET specific surface area.
- the pigment having no porosity has a specific surface area value of 100 m 2 / g or less by the BET method.
- non-porous pigments include, for example, magnesium carbonate, heavy calcium carbonate, light calcium carbonate, zinc carbonate, satin white, kaolin, calcined kaolin, talc, clay, zinc oxide, titanium dioxide, calcium sulfate, and barium sulfate. Etc.
- the pigment used for the undercoat layer is preferably heavy calcium carbonate, light calcium carbonate, or kaolin among the non-porous pigments from the viewpoint of ink absorbability corresponding to an ink jet printer and suppression of defective diffusion of dots.
- the average particle size of the pigment used in the undercoat layer is preferably selected from the range of 0.1 ⁇ m to 5 ⁇ m. More preferably, the pigment includes two or more kinds of pigments having different average particle diameters.
- the average particle diameter of the smaller pigment with respect to the average particle diameter of the larger pigment sequentially satisfies the following relational expression (3). Satisfied.
- “two or more types” includes the same type of pigments having different average particle diameters.
- a pigment having an average particle size larger than the above range suppresses dot diffusion failure, but has poor ink fixability and ink absorbability, and gloss may be difficult to obtain.
- a pigment having an average particle size smaller than the above range has good ink fixability and ink absorbability and easily develops gloss, but is insufficient in suppressing dot diffusion failure, and the coating layer It may be difficult to obtain strength.
- the pigment contains two or more kinds of pigments having different average particle diameters, and the two or more kinds of pigments satisfy the above relational expression (3), so that excellent ink fixing property, ink absorbability, and suppression of dot diffusion failure are achieved. Can be obtained.
- the first pigment having the largest average particle diameter and the second pigment having the second largest average particle diameter satisfy the relational expression (3)
- the second pigment having the second largest average particle diameter and the third pigment having the third largest average particle diameter satisfy the relational expression (3). After that, the relationship is repeated.
- the relational expression (3) is preferably established between the inorganic pigment particles.
- kaolin As the pigment having the largest average particle diameter satisfying the above formula (3), kaolin is preferable. By using kaolin, better ink absorbability can be obtained.
- Pigments with an average particle size in the range of 0.1 ⁇ m to 5 ⁇ m are Shiraishi Calcium, Hyogo Clay, Pimatech, Okutama Kogyo, Engelhard, Huber, Imeris, Tokuyama, Mizusawa Chemical, Tosoh It can be purchased as a commercial product from Silica, Grace, Shionogi and others.
- the target average particle diameter can be appropriately obtained from a pigment having a relatively large average particle diameter by a method of fragmenting with a strong force of mechanical means.
- Mechanical means include: ultrasonic homogenizer, pressure homogenizer, liquid collision homogenizer, high-speed rotary mill, roller mill, container drive medium mill, medium agitator mill, jet mill, mortar, disintegrator (covered in a bowl-shaped container) And an apparatus for grinding and kneading the pulverized product with a bowl-shaped stirring bar), a sand grinder, and the like. In order to reduce the particle size, classification and repeated pulverization can be performed.
- the content in the undercoat layer of the first pigment having the largest average particle diameter satisfying the above formula (3) is less than 50 parts by mass, preferably 5 parts by mass with respect to 100 parts by mass of the total pigment in the undercoat layer. Part to 45 parts by weight.
- binder used for the undercoat layer various known water-based binders whose medium is water can be used.
- the water-based binder is a water-soluble binder or a water-dispersible binder.
- the water-soluble binder include starch derivatives such as oxidized starch, etherified starch and phosphate esterified starch, cellulose derivatives such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose, polyvinyl alcohol derivatives such as polyvinyl alcohol and silanol-modified polyvinyl alcohol, Casein, gelatin or modified products thereof, soy protein, pullulan, gum arabic, Karaya gum, albumin and other natural polymer resins or derivatives thereof, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, alginic acid, polyethyleneimine, polypropylene glycol, polyethylene Examples thereof include, but are not limited to, glycol, maleic anhydride or a copolymer thereof.
- water-dispersible binder examples include conjugated diene copolymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, a polymer of acrylate ester or methacrylate ester, or a copolymer thereof.
- Acrylic copolymer latex, vinyl copolymer latex such as ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyurethane resin latex, alkyd resin latex, unsaturated polyester resin latex, or various of these Examples include, but are not limited to, latex binders such as functional group-modified copolymer latexes with functional group-containing monomers such as carboxy groups of the copolymer, and thermosetting synthetic resins such as melamine resins and urea resins. These aqueous binders can be used alone or in combination.
- the binder of the undercoat layer preferably contains at least one of a water-soluble binder and a water-dispersible binder from the viewpoint of ink absorbability and ink fixability corresponding to an ink jet printer. More preferably, the water-soluble binder is a starch derivative or a polyvinyl alcohol derivative, and the water-dispersible binder is a styrene-butadiene copolymer or a methyl methacrylate-butadiene copolymer.
- the content of the binder in the undercoat layer is preferably 20% by mass or less, more preferably 15% by mass with respect to the total solid content of the undercoat layer, from the viewpoint of ink absorbability corresponding to the ink jet printer and the coating layer strength of the undercoat layer. % Or less.
- the undercoat layer includes an ink fixing agent, a pigment dispersant, a thickener, a fluidity improver, a printability improver, a surfactant, an antifoaming agent, a foam inhibitor, a release agent.
- Molding agent, foaming agent, penetrating agent, coloring dye, coloring pigment, fluorescent whitening agent, UV absorber, antioxidant, preservative, antibacterial agent, water resistance agent, wet paper strength enhancer, dry paper strength enhancer Etc. can be appropriately blended.
- the coating amount of the undercoat layer is preferably 2 g / m 2 or more 7 g / m 2 or less of the range as a dry solid, 3 g / m 2 or more 6 g / m 2 or less in the range is more preferable.
- the method for applying the undercoat layer can be any commonly used coating method and is not particularly limited. Examples thereof include an air knife coater, a blade coater, a roll coater, a bar coater, a rod blade coater, a curtain coater, and a short dwell coater. A blade coater, an air knife coater, and a curtain coater are preferable.
- the coated paper for printing in which the base paper is provided with an undercoat layer and each coating layer may be used as it is.
- a calendar process can be applied in order to improve the quality of appearance such as improvement of smoothness, improvement of printing quality, and adjustment of gloss.
- a device composed of a combination of hard rolls, elastic rolls, or a combination of a hard roll and an elastic roll can be suitably used.
- These apparatuses are called a machine calendar, a soft nip calendar, a super calendar, a multi-stage calendar, a multi-nip calendar, etc., and can also heat a roll intentionally.
- the roll temperature at the time of heating can be suitably used from a medium low temperature of about 40 ° C. to a high temperature of about 250 ° C.
- An apparatus composed of a combination of a belt and a roll can also be used. These devices are called shoe calenders, metal belt calenders, and the like, and can be intentionally heated.
- the microscopic shape of these roll surfaces is not particularly limited, and a smooth or concavo-convex processed surface can be used as long as it does not impair the characteristics of the present invention, such as mirror surface, matte, and emboss.
- the coated paper for printing can be provided with these layers on both sides of the base paper. Providing on both sides is preferable because printing can be performed on both sides depending on the printing machine.
- the coated paper for printing of the present invention can be used for inkjet printing, and a printed image having excellent image quality and durability can be obtained.
- the coated paper for printing of the present invention can be preferably used in an ink jet printer that employs a pigment ink, and a printed image having excellent image quality and durability can be obtained.
- the coated paper for printing of the present invention can be preferably used for a rotary inkjet printer in which the printing speed is 15 m / min or more, 60 m / min or more at a higher speed, and 120 m / min at a higher speed. A printed image having high image quality and durability can be obtained.
- a method for improving the image quality and durability of a printed image printed by an ink jet printer, the step of obtaining the printing coated paper, and the coating of the printing coated paper Provided is a method including a step of forming a printed image by performing inkjet printing using a pigment ink on a layer at a printing speed of 15 m / min or more.
- the present invention also provides a method of forming a printed image free from the occurrence of rubbing, dirt, ink absorption unevenness and bleeding, and white streak by inkjet printing, the step of obtaining the above-mentioned printing coated paper, and the printing coating
- a method including a step of forming a printed image by performing inkjet printing using a pigment ink at a printing speed of 15 m / min or more on a coating layer of a working paper.
- the present invention is also a method for forming an excellent printed image, the step of obtaining the above-mentioned coated paper for printing, and the formation of the printed image on the coating layer of the coated paper for printing using an inkjet printer.
- a method comprising the steps of:
- the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Further, “parts” shown in the examples represents a dry solid content or a mass part of a substantial component unless otherwise specified. The coating amount also indicates the dry coating amount.
- Example 1 Example 1 to (Example 40) and (Comparative Example 1) to (Comparative Example 13)
- Tables 1 and 2 show the contents of the undercoat layer and the coating layer in each example and the number of blended parts.
- a coated paper for printing was prepared according to the following contents.
- Table 3 shows the contents of the undercoat layer and the coating layer of each comparative example and the number of blended parts.
- a base paper was prepared as follows. Further, the Cobb water absorption of the base paper was measured as follows. ⁇ Cobb water absorption> According to JIS P8140, the amount of absorption (g / m 2 ) when the contact time with the water on the surface of the base paper was 30 seconds was measured. Hereinafter, the Cobb water absorption means the Cobb water absorption when the contact time is 30 seconds.
- base paper 7 Phosphate esterified starch with a size press of the base paper 5 and dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) as a cationic resin in a coating amount on both sides of 1.8 g / m 2 respectively.
- a base paper 7 having a Cobb water absorption of 138 g / m 2 was obtained in the same manner as the base paper 5 except that the coating was applied to 3 g / m 2 .
- base paper 8 Phosphate esterified starch with a size press machine of base paper 5 and dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) as a cationic resin in a coating amount on both sides of 1.8 g / m 2 respectively.
- a base paper 8 having a Cobb water absorption of 138 g / m 2 was obtained in the same manner as the base paper 5 except that the coating was applied to 9 g / m 2 .
- base paper 9 Phosphoric esterified starch with a size press of the base paper 5 and dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) as a cationic resin in a coating amount on both sides of 1.7 g / m 2 respectively.
- a base paper 9 having a Cobb water absorption of 138 g / m 2 was obtained in the same manner as the base paper 5 except that the coating was applied so as to be 12 g / m 2 .
- base paper 11 3 g / m 2 and 3 respectively in a coating amount on both sides of phosphate esterified starch with a size press of the base paper 4 and dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) as a cationic resin.
- a base paper 11 having a Cobb water absorption of 126 g / m 2 was obtained in the same manner as the base paper 4 except that the coating was applied so as to be 5 g / m 2 .
- colloidal silica content and number of parts are listed in Tables 1 to 3 (however, colloidal silica composite synthetic resin indicates the number of parts as colloidal silica composite synthetic resin). Pigments other than colloidal silica Content and number of parts are listed in Tables 1 to 3 Binder Content and number of parts are listed in Tables 1 to 3 Blended as described above, mixed and dispersed with water to a solids concentration of 30% Prepared.
- the synthetic resin constituting the colloidal silica composite synthetic resin used vinyltriethoxysilane as a monomer having a silyl group, and styrene and butyl acrylate as monomers having no silyl group.
- Tg was adjusted by the blending ratio of monomer styrene having no silyl group and butyl acrylate.
- the colloidal silica which comprises colloidal silica composite synthetic resin used colloidal silica with an average particle diameter of 30 nm.
- Pigment A Kaolin Pigment B: Heavy calcium carbonate Pigment C: Styrenic plastic pigment Pigment D: Synthetic amorphous silica Pigment E: Styrene-acrylic copolymer Binder a: Phosphate esterified starch Binder b: Polyvinyl alcohol Binder c : Styrene-butadiene copolymer Binder d: Methyl methacrylate-butadiene copolymer
- the coating amount of the undercoat layer and the top layer of the coating layer for Examples 35-38 was respectively 5 g / m 2 and 6 g / m 2 per side. In Comparative Examples 2 and 4, the coating amount of the uppermost coating layer was 6 g / m 2 per side. Examples 11 and 38 were coated on both sides, and the others were coated on one side.
- the calender used an apparatus composed of an elastic roll and a metal roll, and the nip line pressure was 80 kN / m within a range where a thickness profile in the width direction was appropriately obtained.
- the temperature of the metal roll was 40 ° C.
- Comparative Example 8 commercially available glossy photo paper for inkjet printers (IJ-UF-120, manufactured by Mitsubishi Paper Industries), as Comparative Example 9, commercially available glossy paper for inkjet printers (IJ-CastCoat 150J, manufactured by Mitsubishi Paper Industries), Comparative Example 10
- Commercially available paper for inkjet printers (IJ-MateCoat90, manufactured by Mitsubishi Paper Industries)
- commercially available coated paper for printing as Comparative Example 11 (Pearl Coat N, continuous weight 73 kg, manufactured by Mitsubishi Paper Industries), commercially available as Comparative Example 12
- Printing paper Mitsubishi IJ form paper PD, 81.4 g / m 2 , manufactured by Mitsubishi Paper Industries Co., Ltd.
- Comparative Example 13 use of commercially available printing coated paper (Aurora Coat, continuous weight 73 kg, manufactured by Nippon Paper Industries Co., Ltd.) It was.
- These commercially available paper for inkjet printers and coated paper for printing do not contain a cationic resin or a polyvalent metal ion salt in
- Evaluation of the coated paper for printing was performed by the following method.
- a Daipress Screen manufacturer printing press TruepressJet 520 was used as the ink jet printing machine. Printing was performed at a printing conveyance speed of 128 m per minute.
- the white paper glossiness of the coated paper for printing was measured at an incident reflection angle of 75 ° using a digital gloss meter GM-26D manufactured by Murakami Color Research Laboratory in accordance with JIS Z8741. It is sufficient that glossiness is 40% or more as gloss-based coated paper for printing, and 60% to 90% is desirable as excellent gloss-based coated paper for printing.
- Table 4 and Table 5 show the evaluation results in printing using the coated paper for printing in Examples 1 to 40 and Comparative Examples 1 to 13 above.
- the coated papers of the present invention of Examples 1 to 40 are excellent in ink fixability and ink absorbability, suppressed dot diffusion failure, and further excellent in scratch resistance and ink adhesion. Had sex.
- the uppermost coating layer contains a colloidal silica composite synthetic resin.
- the Tg of the synthetic resin constituting the colloidal silica composite synthetic resin is more preferably 50 ° C. or more, or the Tg of the water-dispersible binder is lower than the Tg of the synthetic resin constituting the colloidal silica composite synthetic resin. I understand that.
- the coated paper for printing of Comparative Examples 1 to 7 is because the base paper does not contain one or more selected from a cationic resin or a polyvalent cation salt, or the uppermost coated layer is It has been found that the effect of the present invention cannot be obtained because it does not contain colloidal silica or there is no undercoat layer. Moreover, the effect of the present invention was not obtained with commercially available paper for inkjet printers or coated paper for printing.
- Example 41 Example 41 to (Example 44) and (Comparative Example 14) to (Comparative Example 18) A coated paper for printing was prepared according to the following contents.
- Table 6 shows the contents of the undercoat layer or coating layer of each example and each comparative example and the number of blended parts.
- the base paper 10 or the base paper 12 was used as the base paper.
- undercoat layer coating solution 1 Kaolin (average particle size 2.2 ⁇ m) 20 parts, heavy calcium carbonate (average particle size 1.4 ⁇ m) 80 parts, styrene-butadiene copolymer (Tg: ⁇ 19 ° C.) latex 10 parts, phosphate esterified starch 4
- the undercoat layer coating solution 1 was prepared by adjusting the aqueous solution so that the pH was 9.5 and adjusting the water with a B-type viscosity of 200 to 600 mPa ⁇ s.
- undercoat layer coating solution 2 20 parts of kaolin (average particle size 2.2 ⁇ m), 80 parts of heavy calcium carbonate (average particle size 2.5 ⁇ m), 10 parts of styrene-butadiene copolymer (Tg: ⁇ 19 ° C.) latex, phosphated starch 4
- the undercoat layer coating solution 2 was prepared by adjusting the aqueous solution so as to have a pH of 9.5 and adjusting the B-type viscosity to 200 to 600 mPa ⁇ s.
- the pigments and binders abbreviated in Table 6 are as follows.
- Pigment F Colloidal silica (average particle size 12 nm)
- Pigment G Colloidal silica (average particle size 20-30 nm)
- Pigment H Colloidal silica composite synthetic resin (using the same colloidal silica composite synthetic resin as in Example 36)
- Pigment I Polystyrene organic pigment (average particle size 1 ⁇ m, porosity 50 volume%)
- Pigment J Kaolin (average particle size 2.2 ⁇ m)
- Binder e Styrene-butadiene copolymer (glass transition temperature -19 ° C)
- Binder f Styrene-acrylic copolymer
- Binder g Polyvinyl alcohol (saponification degree 98%, polymerization degree average 400)
- the coated papers for printing of Examples 41 to 44 and Comparative Examples 14 to 16 were prepared according to the following procedure. Further, as Comparative Example 17, a commercially available coated paper for A2 gloss printing (Pearl coat N, continuous weight 73 kg, manufactured by Mitsubishi Paper Industries), and as Comparative Example 18, a commercially available glossy paper exclusively for inkjet printers (IJ-CastCoat 150J, manufactured by Mitsubishi Paper Industries) ) was used.
- Comparative Example 17 a commercially available coated paper for A2 gloss printing (Pearl coat N, continuous weight 73 kg, manufactured by Mitsubishi Paper Industries)
- Comparative Example 18 a commercially available glossy paper exclusively for inkjet printers (IJ-CastCoat 150J, manufactured by Mitsubishi Paper Industries) ) was used.
- the evaluation of the coated paper for printing was carried out by the above method except for the measurement of the contact angle and the remaining droplet volume.
- the measurement of the contact angle and the remaining droplet volume ratio was performed by the following method.
- Table 7 shows the measurement results of these contact angles and residual droplet volume ratios, and the evaluation results.
- Examples 41 to 44 in which the contact angle of the uppermost coating layer is within the range of the present invention, exhibited excellent ink jet printing suitability. From the comparison between Example 42 and Example 43 or Example 44, it can be seen that if the remaining droplet volume ratio is within the range of the present invention, better ink fixing properties and suppression of defective dot diffusion can be obtained.
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Abstract
Description
本発明において原紙としては、LBKP、NBKPなどの化学パルプ、GP、PGW、RMP、TMP、CTMP、CMP、CGPなどの機械パルプ、DIPなどの古紙パルプに、軽質炭酸カルシウム、重質炭酸カルシウム、タルク、クレー、カオリンなどの各種填料、サイズ剤、定着剤、歩留まり剤、カチオン性樹脂や多価陽イオン塩などのカチオン化剤、紙力剤などの各種添加剤を配合した紙料から、酸性、中性、アルカリ性などで抄造した紙を使用できる。
式(1) 残存液滴体積率(%)={(滴下t秒経過後の塗工層表面の残存液滴体積Vt)/(滴下した液滴体積)}×100
式(2) Vt=π×(rt×rt×ht/2+ht×ht×ht/6)
Vt:滴下t秒経過後の塗工層表面の残存液滴体積[μl]
π:円周率
rt:測定する滴下t秒経過後の塗工層表面の液滴半径(μm)
ht:測定する滴下t秒経過後の塗工層表面の液滴高さ(μm)
このような接触角測定装置には、例えば自動接触角計CA-VP300(協和界面科学株式会社製)がある。
R(a)=0.4・R(A)~0.7・R(A) 式(3)
R(A):大きい方の顔料の平均粒子径
R(a):小さい方の顔料の平均粒子径
下記の内容に従って印刷用塗工紙を作製した。各実施例の下塗り層および塗工層の内容と配合部数については表1および表2に示す。
原紙を、以下の通り作製した。また、原紙のコッブ吸水度を以下の通り測定した。
<コッブ吸水度>
JIS P8140に準じ、原紙の表面の水との接触時間30秒のときの吸収量(g/m2)を測定した。以下、コッブ吸水度とは、接触時間30秒のときのコッブ吸水度をいう。
濾水度400mlcsfのLBKP100部からなるパルプスラリーに、填料として軽質炭酸カルシウム15部、両性澱粉0.8部、硫酸バンド0.8部、アルキルケテンダイマー型サイズ剤(サイズパインK903、荒川化学工業社製)0.1部を添加して、長網抄紙機で抄造し、サイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ2g/m2と1.5g/m2になるように塗工した。その後にマシンカレンダー処理をしてコッブ吸水度65g/m2、坪量93g/m2の原紙1を得た。
原紙1のアルキルケテンダイマー型サイズ剤の添加量を0.08部とした以外は原紙1と同様に行い、コッブ吸水度88g/m2の原紙2を得た。
原紙1のアルキルケテンダイマー型サイズ剤の添加量を0.05部とした以外は原紙1と同様に行い、コッブ吸水度103g/m2の原紙3を得た。
原紙1のアルキルケテンダイマー型サイズ剤の添加量を0.03部とした以外は原紙1と同様に行い、コッブ吸水度126g/m2の原紙4を得た。
原紙1のアルキルケテンダイマー型サイズ剤の添加量を0.01部とした以外は原紙1と同様に行い、コッブ吸水度138g/m2の原紙5を得た。
原紙5のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ2g/m2と0.06g/m2になるように塗工した以外は原紙5と同様に行い、コッブ吸水度138g/m2の原紙6を得た。
原紙5のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ1.8g/m2と3g/m2になるように塗工した以外は原紙5と同様に行い、コッブ吸水度138g/m2の原紙7を得た。
原紙5のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ1.8g/m2と9g/m2になるように塗工した以外は原紙5と同様に行い、コッブ吸水度138g/m2の原紙8を得た。
原紙5のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ1.7g/m2と12g/m2になるように塗工した以外は原紙5と同様に行い、コッブ吸水度138g/m2の原紙9を得た。
原紙4のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ3g/m2と2g/m2になるように塗工した以外は原紙4と同様に行い、コッブ吸水度126g/m2の原紙10を得た。
原紙4のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ3g/m2と3.5g/m2になるように塗工した以外は原紙4と同様に行い、コッブ吸水度126g/m2の原紙11を得た。
原紙1のサイズプレス装置でリン酸エステル化澱粉と、カチオン性樹脂としてジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)を両面の塗工量でそれぞれ3g/m2と2g/m2になるように塗工した以外は原紙1と同様に行い、コッブ吸水度65g/m2の原紙12を得た。
原紙5において、カチオン性樹脂としてのジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)に代えて、多価陽イオン塩として塩化マグネシウムを用いる以外は原紙5と同様に行い、コッブ吸水度138g/m2の原紙13を得た。
原紙4において、カチオン性樹脂としてのジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)に代えて、多価陽イオン塩として塩化マグネシウムを用いる以外は原紙4と同様に行い、コッブ吸水度126g/m2の原紙14を得た。
原紙1において、カチオン性樹脂としてのジメチルアミン-エピクロルヒドリン重縮合物(ジェットフィックス5052、里田化工社製)に代えて、多価陽イオン塩として塩化マグネシウムを用いる以外は原紙1と同様に行い、コッブ吸水度65g/m2の原紙15を得た。
原紙4において、カチオン性樹脂を塗工しない以外は原紙4と同様に行い、コッブ吸水度126g/m2の原紙16を得た。
顔料 内容と配合部数は表1~3に記載
水溶性バインダー 内容と配合部数は表1~3に記載
水分散性バインダー 内容と配合部数は表1~3に記載
上記の内容で配合し、水で混合・分散して、固形分濃度50質量%に調製した。
コロイダルシリカ 内容と配合部数は表1~3に記載
(但し、コロイダルシリカ複合合成樹脂は、コロイダルシリカ複合合成樹脂としての配合部数を示す。)
コロイダルシリカ以外の顔料 内容と配合部数は表1~3に記載
バインダー 内容と配合部数は表1~3に記載
上記の内容で配合し、水で混合・分散して、固形分濃度30質量%に調製した。なお、コロイダルシリカ複合合成樹脂を構成する合成樹脂は、シリル基を有する単量体にビニルトリエトキシシランを用い、シリル基を有さない単量体としてスチレンおよびアクリル酸ブチルを用いた。Tgは、シリル基を有さない単量体スチレンおよびアクリル酸ブチルの配合比率によって調整した。コロイダルシリカ複合合成樹脂を構成するコロイダルシリカは平均粒子径30nmのコロイダルシリカを用いた。コロイダルシリカ複合合成樹脂を構成するコロイダルシリカと合成樹脂の質量比は、コロイダルシリカ/合成樹脂=60/40であり、コロイダルシリカ複合合成樹脂の平均粒子径は150nmである。
顔料B:重質炭酸カルシウム
顔料C:スチレン系プラスチックピグメント
顔料D:合成非晶質シリカ
顔料E:スチレン-アクリル共重合体
バインダーa:リン酸エステル化澱粉
バインダーb:ポリビニルアルコール
バインダーc:スチレン-ブタジエン共重合体
バインダーd:メチルメタクリレート-ブタジエン共重合体
原紙に下塗り層用塗工液をブレードコーターにて塗工し乾燥した後、最上層の塗工層用塗工液をエアーナイフコーターにて塗工し乾燥させた。その後、平滑化のためにカレンダー処理を行った。実施例1~8、16、17、21~34、39、40および比較例1、3、5~7について下塗り層と最上層の塗工層の塗工量は片面あたり各々4g/m2と6g/m2とした。実施例9~15、18~20について下塗り層と最上層の塗工層の塗工量は片面あたり各々5g/m2と5g/m2とした。実施例35~38について下塗り層と最上層の塗工層の塗工量は片面あたり各々5g/m2と6g/m2とした。比較例2、4について最上層の塗工層の塗工量は片面あたり6g/m2とした。実施例11、38は両面に塗工し、これら以外は片面に塗工した。カレンダーは弾性ロールと金属ロールからなる装置を用いて、ニップ線圧は幅方向の厚みプロファイルが適切に得られる範囲において、80kN/mで行った。また、金属ロールの温度は40℃とした。
印刷用塗工紙の評価は、下記の方法によって実施した。
印刷用塗工紙の白紙光沢度は、JIS Z8741に準拠し、村上色彩技術研究所製デジタル光沢計GM-26D型を用いて入反射角度75°で測定した。グロス系の印刷用塗工紙として光沢度が40%以上であればよく、優れたグロス系の印刷用塗工紙として60%~90%がよい。
所定の搬送速度で印刷機の排紙部に排出された印刷用塗工紙の印刷面を観察し、インクの擦れ跡およびインクの剥離の度合いを目視評価で判定した。3~5の評価であれば、実用上に問題はない。
5:インクの擦れ跡、インクの剥離が認められない。
4:インクの擦れ跡、インクの剥離がともにほとんど認められない。
3:インクの擦れ跡がかすかにあり、インクの剥離が極僅かに認められる。
2:インクの擦れ跡があり、部分的に印刷物が汚れたように見える。
1:印刷部分の全体的に、インクの擦れ跡やインクの剥離が発生している。
印刷用塗工紙に、18cm×18cm画サイズのブラックインクによるベタ画像を印刷した。印刷してから1時間後に、印刷用塗工紙の印刷面に500gまたは300gの荷重で、押し付け面積を4cm2とし、木綿のガーゼを押し付けて25回摩擦試験を行い、下記基準に従って目視にて評価した。3~5の評価であれば、実用上に問題はない。
5:500g荷重のとき、ほとんど傷が認められない。
4:500g荷重のとき、僅かに傷が認められるが、許容レベルである。
3:300g荷重のとき、僅かに傷が認められるが、許容レベルである。
2:300g荷重のとき、多少の傷が認められる。
1:300g荷重のとき、著しく傷が認められる。
印刷してから1時間後に、印刷用塗工紙の印刷表面を爪で擦過し、インクの接着性強度を官能評価により、下記の5段階で評価した。3~5の評価であれば、実用上に問題はない。
5:剥離がない。
4:剥離がほとんどない。
3:若干剥離があるが、実用上問題ない。
2:剥離があり、使用できない。
1:容易に剥離し、使用できない。
印刷用塗工紙に、印刷機でブラック、シアン、マゼンタ、イエローの各単色および、ブラックインクを除く他の3色インクでの2重色(レッド、グリーン、ブルー)の計7色のベタパターンを、2cm×2cm四方で横一列に隙間なく並べて記録するという方法で、ベタ印刷を行った。印刷部の各色ベタ部および境界部について目視評価で判定した。3~5の評価であれば、実用上に問題はない。
5:色の境界部に滲みがない。
4:色の境界部にほとんど滲みがない。
3:色の境界部に滲みはあるものの、境界部がはっきり識別できる。
2:色の境界部が、はっきりせず、隣接する色が境界部を越えて若干移動している。
1:各色の境界がわからず、隣接する色への滲み出しが大きい。
印刷用塗工紙に、18cm×18cm画サイズのブラックインクによるベタ画像を印刷した。インク滴のドットの拡散不良による白筋の視認性の程度を目視評価で判定した。3~5の評価であれば、実用上に問題はない。
5:白筋が、確認できない。
4:白筋は確認できないが、濃淡が確認できる。
3:白筋は確認できないが、淡い筋ムラが確認できる。
2:薄い白筋が、確認できる。
1:白筋が、はっきり確認できる。
下記の内容に従って印刷用塗工紙を作製した。各実施例および各比較例の下塗り層または塗工層の内容と配合部数については表6に示す。
カオリン(平均粒子径2.2μm)20部、重質炭酸カルシウム(平均粒子径1.4μm)80部、スチレン-ブタジエン共重合体(Tg:-19℃)ラテックス10部、リン酸エステル化澱粉4部を配合し、これにpH9.5となるようにアンモニア水で調整し、B型粘度が200~600mPa・sになるように水で調整し、下塗り層の塗工液1を調製した。
カオリン(平均粒子径2.2μm)20部、重質炭酸カルシウム(平均粒子径2.5μm)80部、スチレン-ブタジエン共重合体(Tg:-19℃)ラテックス10部、リン酸エステル化澱粉4部を配合し、これにpH9.5となるようにアンモニア水で調整し、B型粘度が200~600mPa・sになるように水で調整し、下塗り層の塗工液2を調製した。
顔料 内容と配合部数は表6に記載
バインダー 内容と配合部数は表6に記載
顔料G:コロイダルシリカ(平均粒子径20~30nm)
顔料H:コロイダルシリカ複合合成樹脂(実施例36と同様のコロイダルシリカ複合合成樹脂物を使用)
顔料I:ポリスチレン系有機顔料(平均粒子径1μm、空隙率50体積%)
顔料J:カオリン(平均粒子径2.2μm)
バインダーe:スチレン-ブタジエン共重合体(ガラス転移温度-19℃)
バインダーf:スチレン-アクリル共重合体
バインダーg:ポリビニルアルコール(ケン化度98%、重合度平均400)
原紙に、下塗り層用塗工液を片面あたり塗工量が5g/m2となるようにブレードコーターで塗工した。乾燥後にカレンダー処理をして下塗り層を設けた。次に下塗り層上に、最上層の塗工層用塗工液を片面あたり塗工量が6g/m2となるようにエアーナイフコーターで片面に塗工した。乾燥させた後にカレンダー処理をして印刷用塗工紙を得た。ここで比較例15は下塗り層用塗工液2を用い、それ以外は下塗り層塗工液1を用いた。また比較例16は下塗り層を設けなかった。
接触角の測定ならびに残存液滴体積率の測定は、印刷用塗工紙の塗工層上に混合溶液(イオン交換水/グリセリン=8/2)1μlを滴下し、各所定の接触時間において、自動接触角計CA-VP300(協和界面科学社製)および画像解析ソフトFAMAS(協和界面科学社製)を用いた画像データ解析により行った。画像データ解析は、カーブフィッティング法により行った。また測定に用いた混合溶液(イオン交換水/グリセリン=8/2)は、重量比としてイオン交換水/グリセリン=8/2の割合で混合し、さらに界面活性剤を加えて表面張力27.5mN/mに調整した。
Claims (7)
- 原紙の少なくとも一方の面に顔料とバインダーを含有する下塗り層、および下塗り層上に1層以上の塗工層を設けた印刷用塗工紙において、原紙が少なくともカチオン性樹脂および多価陽イオン塩から選ばれる1種以上を含有し、最上層の塗工層が少なくともコロイダルシリカを含有し、最上層の塗工層表面のJIS Z8741で規定する75°光沢度が40%以上である印刷用塗工紙。
- 前記原紙が、接触時間30秒のときのJIS P8140に準じるコッブ吸水度が60g/m2以上である請求項1に記載の印刷用塗工紙。
- 最上層の塗工層に含まれるコロイダルシリカが、コロイダルシリカ複合合成樹脂を含む請求項1または2に記載の印刷用塗工紙。
- 前記コロイダルシリカ複合合成樹脂を構成する合成樹脂のガラス転移温度が、50℃以上である請求項3に記載の印刷用塗工紙。
- 最上層の塗工層に含有されるバインダーが、水分散性バインダーであり、水分散性バインダーのガラス転移温度が、コロイダルシリカ複合合成樹脂を構成する合成樹脂のガラス転移温度よりも低い温度である請求項3または4に記載の印刷用塗工紙。
- 原紙の少なくとも一方の面に顔料とバインダーを含有する下塗り層および下塗り層上に1層以上の塗工層を設けた印刷用塗工紙において、イオン交換水とグリセリンの混合溶液(イオン交換水/グリセリン=8/2)に対する最上層の塗工層表面の接触角が混合溶液と接触0.1秒後では55°以上85°以下、接触1.5秒後では25°以上45°以下であり、塗工層表面のJIS Z8741で規定する75°光沢度が40%以上であることを特徴とする印刷用塗工紙。
- 前記印刷用塗工紙において、イオン交換水とグリセリンの混合溶液(イオン交換水/グリセリン=8/2)の液滴1μlを最上層の塗工層表面に滴下した場合の滴下1.5秒後の残存液滴体積率が75%以上100%以下、滴下10秒後の残存液滴体積率が60%以上85%以下である請求項6に記載の印刷用塗工紙。
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US (1) | US8609210B2 (ja) |
JP (1) | JP5285157B2 (ja) |
CN (1) | CN102470680A (ja) |
DE (1) | DE112010002965T5 (ja) |
WO (1) | WO2011007775A1 (ja) |
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JP2016175249A (ja) * | 2015-03-19 | 2016-10-06 | 三菱製紙株式会社 | 産業用インクジェット印刷機向け印刷用塗工紙 |
JP7088714B2 (ja) | 2018-03-28 | 2022-06-21 | 日本製紙株式会社 | インクジェット記録体用支持体及びそれを用いたインクジェット記録体 |
Also Published As
Publication number | Publication date |
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CN102470680A (zh) | 2012-05-23 |
US8609210B2 (en) | 2013-12-17 |
JPWO2011007775A1 (ja) | 2012-12-27 |
DE112010002965T5 (de) | 2012-10-11 |
JP5285157B2 (ja) | 2013-09-11 |
US20120114880A1 (en) | 2012-05-10 |
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