WO2023017661A1 - 印刷用シート及び印刷用シートの製造方法 - Google Patents
印刷用シート及び印刷用シートの製造方法 Download PDFInfo
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- WO2023017661A1 WO2023017661A1 PCT/JP2022/020655 JP2022020655W WO2023017661A1 WO 2023017661 A1 WO2023017661 A1 WO 2023017661A1 JP 2022020655 W JP2022020655 W JP 2022020655W WO 2023017661 A1 WO2023017661 A1 WO 2023017661A1
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- WIPO (PCT)
- Prior art keywords
- mass
- acrylate
- printing sheet
- methacrylate
- calcium carbonate
- Prior art date
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Classifications
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/68—Particle size between 100-1000 nm
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
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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
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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
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
Definitions
- the present invention relates to a printing sheet and a method for manufacturing a printing sheet. More specifically, the present invention relates to a printing sheet having a coating layer on the surface of a substrate, and to improve adhesion and adhesiveness of the coating layer to the substrate, printability, water resistance, weather resistance, antistatic properties, etc. It relates to technology related to improvement.
- thermoplastics and paper materials At present, environmental protection has become an international issue, and the reduction of the consumption of thermoplastics and paper materials is being extensively studied.
- a highly-filled inorganic powder-blended thermoplastic composition has been proposed and put to practical use as a printing sheet as described above (see, for example, Patent Document 1, etc.).
- a coating liquid made of clay, latex or acrylic polymer is coated to form a coat layer, which is also called an ink receiving layer or a print receiving layer (for example, Patent Documents 2 to 4). etc.).
- the clay/latex when the clay/latex is coated, for example, since the clay component has color, the degree of whiteness of the printing sheet after coating is low, and there are cases where the color as a substitute for paper is worrisome. .
- the latex used contains a polystyrene component, there is a problem that the deterioration due to sunlight, especially ultraviolet rays, is large, and yellowing occurs over time.
- the fixability of the toner is low in printability, especially in laser printer (LBP) printing, and it is necessary to fix the toner at a high temperature.
- LBP laser printer
- these compounds are added to the coating liquid composition, there is a concern that the adhesive strength between the plastic sheet that is the base material and the coating liquid may be further reduced. However, no particular improvement could be expected.
- Patent Document 5 a polymer binder composed of vinyl acetate, vinyl-acrylic, styrene-acrylic or styrene-butadiene-acrylic polymer is mixed with tetrapotassium pyrophosphate as a dispersant, titania particles in a predetermined amount, clay and calcium carbonate. It is disclosed that a sheet having a high degree of whiteness is obtained by blending with, etc., and coating it on a substrate. By blending a predetermined amount of titania particles, it is certainly possible to improve the whiteness, but the problem of adhesion between the base material and the coating layer as described above, poor water resistance of the coating layer, and poor weather resistance. , no particular improvement can be expected.
- pigments such as calcium carbonate precipitated angonite, clay, and hollow sphere polyethylene pigment are added to an acrylic binder on the surface of a smooth substrate made of fibers having a fiber length-weighted average exceeding 0.9 mm. is coated with a composition containing a binder:pigment ratio of 100:15 to 100:40 to obtain a highly smooth printing sheet.
- a composition containing a binder:pigment ratio of 100:15 to 100:40 to obtain a highly smooth printing sheet.
- the smoothness of the sheet will increase, it is expected that the whiteness of the sheet, the printability, the adhesion between the substrate and the coating layer, the antistatic property, etc. will be improved.
- a coating composition coated on a substrate by a DF coater method to obtain a printing sheet contains 5 to 30 parts by weight of high aspect ratio clay and 90% or more of particles smaller than 2 ⁇ m. 70 to 95 parts by weight of calcium carbonate, which is disclosed to economically obtain a sheet with a high degree of whiteness.
- the high content of calcium carbonate can be expected to improve the whiteness of the sheet, the high content of calcium carbonate changes the texture of the sheet (increases the glossiness of the printed matter). is concerned.
- an SBR resin is used as the binder component of the coating composition, and there are problems such as poor weather resistance and poor water resistance due to the inclusion of the polystyrene component as described above.
- Patent Document 8 as an ink receiving layer, for example, hard polymer particles such as polymethyl methacrylate are blended in a film-forming binder, and kaolin, calcined clay, structured clay, heavy carbonate A printing sheet is disclosed which is formed on a substrate with a composition to which particles such as calcium, precipitated calcium carbonate, titanium dioxide, aluminum trihydride, satin white, silica, zinc oxide and barium sulfate are added. Addition of polymethyl methacrylate particles can be expected to improve the adhesion between the base material and the coating layer and to improve water resistance.
- hard polymer particles such as polymethyl methacrylate are blended in a film-forming binder, and kaolin, calcined clay, structured clay, heavy carbonate
- a printing sheet which is formed on a substrate with a composition to which particles such as calcium, precipitated calcium carbonate, titanium dioxide, aluminum trihydride, satin white, silica, zinc oxide and barium sulfate are added. Addition of polymethyl methacrylate particles can be
- polymethyl methacrylate particles are mainly used as the particles to be blended in the receiving layer, for example, in the case of LBP printing, the fixability with the toner is not sufficient, and it becomes necessary to fix the toner at a high temperature. Similarly, there is a risk that the sheet will melt due to heat and cause a paper jam. In addition, polymethyl methacrylate particles are disadvantageous from an economic point of view, leading to an increase in the price of the sheet.
- Patent Document 9 when creating a hologram, polymer pigments such as styrene-acrylic copolymer particles are added to an acrylic polymer, styrene-acrylic copolymer, etc. on a base material as a receiving layer. Furthermore, it is disclosed to use a sheet formed on a substrate with a composition in which precipitated calcium carbonate (PCC), heavy natural calcium carbonate, or kaolin or other clays are added thereto.
- PCC precipitated calcium carbonate
- Patent Document 8 when polymer particles such as styrene-acrylic copolymer particles are used, the matte feeling of the sheet may increase, and furthermore, the toner in LBP printing may be reduced.
- an ink-receiving layer containing amorphous silica and a binder as main components is provided on one side of a substrate, and the side opposite to the side of the substrate on which the ink-receiving layer is provided.
- a styrene-acrylic copolymer, a styrene-butadiene copolymer or an ethylene-vinyl acetate copolymer as a pigment and binder latex selected from the group consisting of delaminated clay, kaolin, talc, calcium carbonate, and a combination of delaminated clay and talc. Configurations with a backing layer comprising a polymer are shown.
- a back layer is formed on the opposite side of the receiving layer by mixing clay and calcium carbonate with a binder latex. It is provided for the sake of improvement, and does not have a structure that solves the problem of the receiving layer, which is the subject of the present invention, and contains a styrene component as a binder component, which causes a problem of moisture resistance. be.
- a surface size layer composed of oxidized starch, a sizing agent, and an acrylic polymer is formed on the outer surface side of a paper liner that forms the surface of a gypsum board, and further, a carbonic acid layer is formed on the one surface.
- a configuration comprising a coating layer comprising at least one inorganic filler selected from calcium, clay, aluminum silicate, calcined clay, titanium dioxide and mixtures thereof and a binder such as a styrene-acrylic copolymer is disclosed.
- This document describes that a decorative pattern can be printed on the coating layer.
- problems such as poor weather resistance and poor water resistance cannot be solved.
- Patent Document 12 provides an ink-absorbing layer containing at least three kinds of inorganic pigments such as light calcium carbonate, clay, and silica in a binder resin at a ratio of 2:1:2 to 2:3:2.
- a coated film is disclosed.
- Patent Document 13 discloses a coating composition based on precipitated calcium carbonate containing clay and a binder resin.
- the coating layer contains a large amount of inorganic pigments other than clay, particularly light calcium carbonate, as described in these patent documents, it is difficult to develop sufficient gloss, and the printability is often poor. Become.
- the printing sheet of Patent Document 14 has excellent printability, good adhesion between the base material and the coating layer, and good antistatic performance, so that problems such as paper jams are less likely to occur during printing, and it is also water resistant. , good weather resistance and other properties, and excellent printability.
- various physical properties such as adhesion and adhesiveness between the base material and the coating layer.
- the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a further improved printing sheet and its manufacturing method.
- the present invention also provides a printing sheet having a coating layer for receiving ink on at least one surface of a base material, which is excellent in printability and has good antistatic performance, and causes problems such as paper jams during printing.
- a printing sheet which is resistant to abrasion and is excellent in various properties such as water resistance and weather resistance, in particular, a printing sheet having extremely good adhesion between a base material and a coat layer, and a method for producing the same. Make it an issue.
- the present inventors reexamined the formulation of the coating layer made of an acrylic polymer, and used heavy calcium carbonate having a specific average particle size instead of light calcium carbonate, which was combined with talc and blended in a predetermined amount.
- the inventors have found that the above-described problems can be solved, and that a printing sheet can be obtained that is particularly excellent in adhesion and adhesiveness between the substrate and the coating layer.
- the present invention for solving the above problems has a structure in which, on one or both sides of a substrate, a continuous phase made of an acrylic polymer contains 35% by mass or more and 65% by mass or less of clay, and 5% by mass or more and 30% by mass of ground calcium carbonate. % or less, wherein the volume average particle size of the ground calcium carbonate is 0.05 ⁇ m or more and 2.00 ⁇ m or less. It is a sheet for printing.
- the substrate contains a polyolefin resin and an inorganic substance powder at a mass ratio of 50:50 to 10:90.
- a printing sheet in which the inorganic substance powder is calcium carbonate powder is shown.
- the clay has a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less.
- a printing sheet is shown in which the acrylic polymer is a (meth)acrylic acid alkyl ester.
- the (meth)acrylic acid alkyl ester is methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, nonyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, methacryl selected from the group consisting of n-octyl acid, 2-ethylhexyl methacrylate, isooctyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl acryl
- the printing sheet of the present invention on one side or both sides of the base material, 35% by mass or more and 65% by mass or less of clay and 5% by mass or more and 30% by mass of ground calcium carbonate in the continuous phase composed of the acrylic polymer.
- a printing sheet comprising The printing sheet is characterized in that the heavy calcium carbonate has a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less.
- Another aspect of the printing sheet of the present invention is a printing sheet in which the inorganic substance powder in the coat layer consists essentially of the clay and the ground calcium carbonate.
- the present invention for solving the above-mentioned problems has a structure in which, on one or both sides of a substrate, a continuous phase made of an acrylic polymer contains 35% by mass or more and 65% by mass or less of clay on a dry mass basis, and has a volume average particle diameter of 0.05 ⁇ m or more.
- a method for producing a printing sheet characterized by coating an acrylic polymer water-based emulsion containing 5% by mass or more and 30% by mass or less of heavy calcium carbonate of 0.00 ⁇ m or less.
- a base material containing a polyolefin resin and an inorganic substance powder at a mass ratio of 50:50 to 10:90 is extruded into a sheet, followed by a stretching step.
- a method for producing a printing sheet characterized by coating one side or both sides of a base sheet with the aqueous acrylic polymer emulsion through
- a printing sheet having a coating layer for receiving ink on at least one surface of a base material has excellent printability, good antistatic performance, and problems such as paper jams during printing. It is possible to provide a printing sheet which is less likely to cause erosion and which is excellent in various properties such as water resistance and weather resistance. Furthermore, according to the present invention, the whiteness and texture (appropriate glossiness) of the printing sheet are good, and the quick-drying of the ink when used for oil-based offset printing, UV offset printing, etc. is also good, It becomes a printing sheet excellent in offset aptitude.
- the printing sheet of the present invention is excellent in adhesion and adhesiveness between the substrate and the coating layer, it is difficult for the coating layer to peel off during printing, subsequent processing such as folding, and during use. Therefore, it can be applied to various printing and processing processes, and it can be used not only for general-purpose printed materials such as menu tables and posters, but also for food applications such as milk cartons, medical and sanitary applications such as folding cups, and containers for storing chemical solutions. It can be used for the purpose of
- the printing sheet of the present invention comprises a sheet-like base material and a coat layer formed on at least one surface of the base material. is 35% by mass or more and 65% by mass or less, and heavy calcium carbonate having a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less is blended in a ratio of 5% by mass or more and 30% by mass or less.
- the other configuration of the printing sheet according to the present invention is not particularly limited as long as it has the above-described coat layer on at least one surface of the substrate.
- An intermediate layer having some function between the and the coat layer for example, a sealant layer for improving the adhesion between the base material and the coat layer, an internal printing layer for giving colors and patterns to the printing sheet, shielding A layer or the like, a protective layer, an adhesive layer, or the like on the surface of the substrate not provided with the coat layer, or a protective layer or the like on the surface of the coat layer can be optionally provided.
- Substrate The material of the substrate in the printing sheet of the present invention is not particularly limited. It may be made of synthetic paper. Further, as the base material, a sheet made of inorganic powder-blended thermoplastic in which inorganic powder is highly filled in thermoplastic, particularly a polyolefin resin and inorganic powder at a mass ratio of 50:50 to 10. From the viewpoint of environmental conservation and the viewpoint of improving properties such as mechanical strength and heat resistance, it is preferable to use a sheet made of a thermoplastic containing an inorganic substance powder at a ratio of 90:90.
- the resin constituting the plastic sheet or the inorganic powder-containing thermoplastic sheet is not particularly limited, and various resins can be used according to the application, function, etc. of the printing sheet.
- polyolefin resins such as polyethylene resins, polypropylene resins, polymethyl-1-pentene, ethylene-cyclic olefin copolymers; ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers
- Functional groups such as polymers, metal salts of ethylene-methacrylic acid copolymers (ionomers), ethylene-alkyl acrylate copolymers, ethylene-alkyl methacrylate copolymers, maleic acid-modified polyethylene, maleic acid-modified polypropylene, etc.
- polyolefin resin Containing polyolefin resin; polyamide resin such as nylon-6, nylon-6,6, nylon-6,10, nylon-6,12; fragrance such as polyethylene terephthalate and its copolymer, polyethylene naphthalate, polybutylene terephthalate
- Thermoplastic polyester resins such as aliphatic polyester resins such as polybutylene succinate, polylactic acid, etc.; polycarbonate resins such as aromatic polycarbonates and aliphatic polycarbonates; atactic polystyrene, syndiotactic polystyrene, acrylonitrile- Polystyrene resins such as styrene (AS) copolymers, acrylonitrile-butadiene-styrene (ABS) copolymers; polyvinyl chloride resins such as polyvinyl chloride and polyvinylidene chloride; polyphenylene sulfide; polyether sulfone, polyether ket
- thermoplastic resins it is preferable to use polyolefin resins, aromatic polyester resins, and aliphatic polyester resins in terms of ease of molding, performance, and economy.
- the polyolefin-based resin is a polyolefin-based resin having olefin component units as a main component. Cyclic olefin copolymers and the like, and mixtures of two or more thereof are also included.
- the above-mentioned "mainly composed" means that the olefin component unit is contained in the polyolefin resin in an amount of 50% by mass or more, and the content is preferably 75% by mass or more, more preferably 85% by mass. % or more, more preferably 90 mass % or more.
- the method for producing the polyolefin resin used in the present invention is not particularly limited, and can be obtained by any method using a Ziegler-Natta catalyst, a metallocene catalyst, a radical initiator such as oxygen or a peroxide, or the like. It may be something else.
- polypropylene-based resin examples include resins having a propylene component unit of 50% by mass or more, and examples thereof include propylene homopolymers and copolymers of propylene and other ⁇ -olefins that can be copolymerized.
- Other ⁇ -olefins copolymerizable with propylene include, for example, ethylene, 1-butene, isobutylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3,4-dimethyl-1-butene. , 1-heptene, 3-methyl-1-hexene, and other ⁇ -olefins having 4 to 10 carbon atoms.
- Propylene homopolymers include isotactic, syndiotactic, atactic, hemiisotactic, and linear or branched polypropylenes exhibiting various stereoregularities.
- the above copolymer may be a random copolymer or a block copolymer, and may be a terpolymer as well as a binary copolymer. Specific examples include ethylene-propylene random copolymers, butene-1-propylene random copolymers, ethylene-butene-1-propylene random terpolymers, ethylene-propylene block copolymers, and the like. .
- polyethylene-based resin examples include resins having an ethylene component unit of 50% by mass or more.
- examples include high-density polyethylene (HDPE), low-density polyethylene (LDPE), medium-density polyethylene, linear low-density polyethylene ( LLDPE), ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-propylene-butene 1 copolymer, ethylene-butene 1 copolymer, ethylene-hexene 1 copolymer, ethylene-4 methylpentene 1 Copolymers, ethylene-octene 1 copolymers, etc., and mixtures of two or more thereof are also included.
- HDPE high-density polyethylene
- LDPE low-density polyethylene
- LLDPE linear low-density polyethylene
- ethylene-vinyl acetate copolymer ethylene-propylene copolymer
- polypropylene-based resins are preferably used because they have a particularly excellent balance between mechanical strength and heat resistance.
- the base material is a thermoplastic sheet containing an inorganic powder
- the inorganic powder that can be mixed in the sheet is not particularly limited, and examples include calcium, magnesium, aluminum, titanium, and iron. , zinc and other carbonates, sulfates, silicates, phosphates, borates, oxides, or powdery hydrates thereof.
- Specific examples include calcium carbonate, carbonate Magnesium, zinc oxide, titanium oxide, silica, alumina, clay, talc, kaolin, aluminum hydroxide, magnesium hydroxide, aluminum silicate, magnesium silicate, calcium silicate, aluminum sulfate, magnesium sulfate, calcium sulfate, magnesium phosphate, barium sulfate , silica sand, carbon black, zeolite, molybdenum, diatomaceous earth, sericite, shirasu, calcium sulfite, sodium sulfate, potassium titanate, bentonite, graphite and the like. These may be synthetic or derived from natural minerals, and may be used alone or in combination of two or more.
- the shape of the inorganic substance powder is not particularly limited, and may be particulate, flake, granular, fibrous, or the like.
- the particulate form it may be spherical as generally obtained by a synthetic method, or irregularly shaped as obtained by pulverizing natural minerals.
- These inorganic powders are preferably calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, silica, alumina, clay, talc, kaolin, aluminum hydroxide, magnesium hydroxide, and the like, with calcium carbonate powder being particularly preferred.
- the calcium carbonate may be either so-called light calcium carbonate prepared by a synthetic method or so-called heavy calcium carbonate obtained by mechanically pulverizing and classifying a natural raw material containing CaCO 3 as a main component such as limestone. It is possible to use a combination of these, but from the viewpoint of economy, ground calcium carbonate is preferable.
- heavy calcium carbonate is obtained by mechanically pulverizing and processing natural limestone, etc., and is clearly distinguished from synthetic calcium carbonate produced by chemical precipitation reaction, etc.
- the pulverization method includes a dry method and a wet method, but the dry method is preferable from the viewpoint of economy.
- the surface of the inorganic powder may be surface-modified in advance according to a conventional method.
- surface modification methods include physical methods such as plasma treatment, and chemical surface treatment using a coupling agent or surfactant.
- coupling agents include silane coupling agents and titanium coupling agents.
- Surfactants may be anionic, cationic, nonionic or amphoteric, and examples thereof include higher fatty acids, higher fatty acid esters, higher fatty acid amides and higher fatty acid salts.
- the inorganic substance powder is preferably particles, and the average particle size is preferably 0.1 ⁇ m or more and 50.0 ⁇ m or less, more preferably 1.0 ⁇ m or more and 10.0 ⁇ m or less, further preferably 1.0 ⁇ m or more and 5.0 ⁇ m or less.
- the average particle size of the inorganic substance powder described in this specification refers to a value calculated from the measurement result of the specific surface area by the air permeation method according to JIS M-8511.
- a specific surface area measuring device SS-100 manufactured by Shimadzu Corporation can be preferably used.
- the particle size distribution does not contain particles having a particle size of more than 50.0 ⁇ m.
- the average particle size is preferably 0.5 ⁇ m or more.
- the inorganic substance powder may be fibrous, powdery, flaky, or granular.
- the average fiber length of the fibrous inorganic substance powder is preferably 3.0 ⁇ m or more and 20.0 ⁇ m or less.
- the average fiber diameter is preferably 0.2 ⁇ m or more and 1.5 ⁇ m or less.
- the aspect ratio is usually 10 or more and 30 or less.
- the average fiber length and average fiber diameter of the fibrous inorganic substance powder were measured with an electron microscope, and the aspect ratio is the ratio of the average fiber length to the average fiber diameter (average fiber length/average fiber diameter). is.
- the blending ratio (% by mass) of the thermoplastic resin contained in the sheet to the inorganic powder is as follows: A ratio of 50:50 to 10:90 is preferred, a ratio of 40:60 to 20:80 is more preferred, and a ratio of 40:60 to 25:75 is even more preferred. If the proportion of the inorganic powder in the blending ratio of the thermoplastic resin and the inorganic powder is lower than 50% by mass, the thermoplastic resin composition containing the inorganic powder will have a predetermined texture due to the addition of the inorganic powder. This is because physical properties such as impact resistance cannot be obtained.
- additives when the base material is the plastic sheet or the inorganic powder-containing thermoplastic sheet, it is possible to add other additives as auxiliary agents to the composition, if necessary. be.
- Other additives include, for example, plasticizers, colorants, lubricants, coupling agents, fluidity improvers, dispersants, antioxidants, ultraviolet absorbers, flame retardants, stabilizers, antistatic agents, foaming agents, etc. is mentioned. These additives may be used alone or in combination of two or more.
- Paper-based material Specific examples of the case where the substrate is made of a paper-based material include paper substrates such as glassine paper, coated paper, fine paper, dust-free paper, and impregnated paper, and thermoplastic resins such as polyethylene for the above paper substrates. Laminated paper laminated with
- the substrate may be composed of a single layer sheet made of the material described above, or a plurality of layers may be laminated to constitute the substrate.
- the substrate is the plastic sheet or the thermoplastic sheet containing the inorganic powder
- the sheet may be unstretched, or may be stretched in a uniaxial or biaxial direction such as longitudinally or laterally. It may be the one that was made.
- the thickness of the substrate is not particularly limited, but is usually 10 ⁇ m or more and 300 ⁇ m or less, preferably 25 ⁇ m or more and 200 ⁇ m or less.
- one or both sides of the base material may be oxidized if desired for the purpose of improving adhesion to the coating layer provided on the surface.
- Surface treatment can be performed by a method, a roughening method, or the like.
- the oxidation method include corona discharge treatment, flame treatment, plasma treatment, glow discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone/ultraviolet irradiation treatment, and the like.
- Examples include sandblasting, solvent treatment, and the like.
- a primer treatment can also be applied.
- the coat layer of the printing sheet of the present invention may be provided on only one side of the substrate, or may be provided on both sides.
- the thickness of the coating layer is not particularly limited, but for example, it is preferably 1 ⁇ m or more and 10 ⁇ m or less, more preferably 2 ⁇ m or more and 8 ⁇ m or less, and particularly 3 ⁇ m or more and 5 ⁇ m or less. preferable. When the thickness is within this range, the coating layer sufficiently functions as an ink-receiving layer and exhibits ink-receiving properties such as good colorability and color-developing properties. Properties such as antistatic properties and adhesion to ink are also improved.
- the coating layer contains 35% by mass to 65% by mass, more preferably 38% by mass to 60% by mass, and still more preferably 5 mass% to 30 mass%, more preferably 7 mass% to 27 mass% of heavy calcium carbonate having a volume average particle size of 0.05 ⁇ m to 2.00 ⁇ m at a ratio of 40 mass% to 55 mass% % or less, more preferably 9 mass % or more and 25 mass % or less.
- clay and ground calcium carbonate having a predetermined particle size are present in a continuous phase made of an acrylic polymer in a well-balanced manner, so that the desired water resistance and whiteness of the printing sheet can be achieved.
- the surface of the sheet does not lose its smoothness, and at the same time, fine irregularities are formed, and the effect of improving weather resistance by scattering incident light can be obtained.
- the presence of clay in the continuous phase of the acrylic polymer lowers the resistivity, particularly the surface resistivity, making it possible to transfer toner without applying a high voltage in the case of LBP printing, for example.
- the presence of heavy calcium carbonate in the continuous phase made of acrylic polymer alleviates the yellowness caused by clay and maintains the whiteness.
- the quick-drying property is improved, and the suitability for oil-based offset printing is improved.
- the heavy calcium carbonate having a predetermined particle size as described above and the clay are combined in a well-balanced manner in the coat layer, so that the adhesion between the base material and the coat layer is excellent. Very good adhesion.
- the present invention is not limited by any particular theory, one possible reason why the present invention is effective is the manifestation of the anchoring effect caused by the heavy calcium carbonate having a predetermined particle size as described above.
- heavy calcium carbonate is obtained by mechanically pulverizing and processing natural limestone, etc., so compared to light calcium carbonate with an equivalent particle size, it generally becomes irregularly shaped particles with many irregularities.
- the presence of clay (and heavy calcium carbonate) on the surface of the coating layer forms fine unevenness on the surface of the sheet, which improves weather resistance by scattering incident light. It is considered that sufficient water resistance is maintained by the presence of on the surface of the coating layer, and that a good antistatic effect is obtained by the presence of clay. Furthermore, by blending clay and heavy calcium carbonate in a predetermined ratio in a well-balanced manner in the coat layer, it is possible to improve the printability (fixability and transferability) of the resulting printing sheet for LBP and offset printability. is estimated to be
- the amount of clay blended in the coat layer is less than the above range, the reduction in the surface resistivity of the sheet due to the blending of clay will not be sufficient, and the resistivity will increase. In this case, the adhesive strength of the toner may be lowered, the transferability may be lowered, and the adhesiveness to the substrate may be lowered. On the other hand, if the amount of clay blended is more than the above range, the transferability when used for LBP printing is good, but the water resistance of the coat layer is reduced, the appearance is adversely affected, and the coat layer is insufficient. There is a possibility that it will not be possible to form a continuous layer having sufficient strength.
- the whiteness of the sheet can be maintained at a desired level. That is, since the coating layer of the printing sheet of the present invention contains clay at a rate of 30% by mass or more as described above, there is a possibility that the yellowness difference (b * value) of the sheet may increase. As described above, by blending the heavy calcium carbonate in a proportion of 5% by mass or more, the whiteness can be effectively improved. Furthermore, by setting the amount of heavy calcium carbonate within the above range, appropriate oil resistance is exhibited, the quick-drying property of the oil-based ink is enhanced, and the oil-based offset suitability is improved.
- the heavy calcium carbonate at a ratio of 30% by mass or less, it is possible to smooth the surface of the coat layer and increase the glossiness.
- the blending ratio exceeds 30% by mass, the glossiness is lowered.
- the proportion is preferably 25% by mass or less, more preferably 20% by mass or less.
- the coating layer of the printing sheet of the present invention is formed by blending clay and heavy calcium carbonate at a predetermined blending ratio as described above.
- the surface of the coating layer can be made matte with a certain degree of roughness, or It is also possible to make it a glossy one with an increased degree of gloss.
- the acrylic polymer serving as the matrix of the coat layer includes polymers obtained by using (meth)acrylic acid, (meth)acrylic acid esters, (meth)acrylamides, and (meth)acrylonitrile as main monomer components.
- the term "(meth)acryl” used in this specification includes both “acryl” and “methacryl”.
- the monomer component constituting the acrylic polymer is not particularly limited, but includes one or more selected from the group consisting of the following components: acrylic acid, methacrylic acid; For example, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, hexyl acrylate, n-octyl acrylate, 2-acrylate - acrylic acid alkyl esters having 1 to 18 carbon atoms in the alkyl group, such as ethylhexyl, isooctyl acrylate, nonyl acrylate, lauryl acrylate, stearyl acrylate, palmityl acrylate or cyclohexyl acrylate; For example, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl
- Alkyl ester having a hydroxyl group on the side chain of (meth) acrylic acid such as; For example, polyethylene glycol having an ethylene glycol unit in the molecule (n is preferably 3 or more and 20 or less.) Diacrylate, trimethylolpropane EO-modified (n is preferably 3 or more and 20 or less.) Triacrylate, phenol EO-modified (n is preferably 3 or more and 20 or less.) Acrylate, For example, alkenyloxyalkyl esters of (meth)acrylic acid such as allyloxyethyl acrylate and allyloxyethyl methacrylate, For example, methoxybutyl acrylate, methoxybutyl methacrylate, methoxyethyl acrylate, methoxyethyl methacrylate, ethoxybutyl acrylate, alkyl esters having an alkoxyl group on the side chain of (meth)acrylic acid such as ethoxybut
- a bifunctional or polyfunctional acrylic monomer specifically, for example, 1, 4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, the above polyethylene glycol di(meth)acrylate, neopentylglycol hydroxypivalate di(meth) acrylates, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphate di(meth)acrylate, allylated cyclohexyl di(meth)acrylate, isocyanurate di(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(
- the acrylic polymer constituting the continuous phase of the coating layer in the present invention may be a homopolymer composed of only one of the various monomer components exemplified above, or the various monomer components exemplified above. may be a copolymer (copolymer) obtained by combining a plurality of Furthermore, in one embodiment of the present invention, a copolymer containing other monomer components in addition to the above monomer components may be used as the acrylic polymer.
- Monomer components other than those exemplified above are not particularly limited as long as they form a copolymer with the above monomer components.
- Examples include vinyl acetate, vinyl chloride, vinylidene chloride, vinyl lactate, vinyl butyrate, vinyl versatate and Vinyl monomers such as vinyl benzoate, ethylene, butadiene, styrene and the like can be mentioned.
- vinyl benzoate ethylene, butadiene, styrene and the like can be mentioned.
- the method for forming the coat layer in the printing sheet of the present invention is not particularly limited, but generally, from the viewpoint of coatability in forming such a coat layer, It is preferably used in the form of being dispersed in water or dissolved in an organic solvent, and particularly preferably in the form of being dispersed in water, that is, in the form of an acrylic polymer aqueous emulsion.
- the acrylic polymer preferably has the form of an aqueous emulsion at the stage of being a raw material for forming the coat layer.
- nonionic surfactants used in the emulsion polymerization, anionic, cationic, amphoteric, and nonionic surfactants can be used alone or in combination of two or more. Among these, nonionic and cationic are preferred. Examples of nonionic surfactants include, but are not limited to, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, and the like. be.
- Cationic surfactants are not particularly limited, and examples thereof include dodecyltrimethylammonium chloride, stearyltrimethylammonium chloride, N-2-ethylhexylpyridinium chloride, etc.
- Nonionic surfactants are most preferred. .
- polyoxyethylene alkylphenyl ether is particularly preferred.
- the amount of the surfactant is not particularly limited, it is usually preferably used in an amount of 1 to 5% by mass based on the total amount of the monomers.
- a water-soluble polymer such as gelatin or polyvinyl alcohol may be used in combination as a protective colloid agent.
- radical polymerization initiator in emulsion polymerization, potassium persulfate, persulfate such as ammonium persulfate, hydrogen peroxide water, t-butyl hydroperoxide, water-soluble type such as hydrochloride of azobisamidinopropane, benzoyl Oil-soluble types such as peroxide, diisopropylperoxydicarbonate, cumylperoxyneodecanoate, cumylperoxyoctoate, and azobisisobutyronitrile are exemplified, but water-soluble ones are preferred.
- the polymerization initiator is not particularly limited, but is used, for example, in a proportion of 0.01 to 0.50% by mass based on the total amount of monomers.
- the polymerization reaction is not particularly limited, it is usually carried out with stirring at a temperature of 35 to 90°C, and the reaction time is usually 3 to 40 hours.
- a basic substance at the start or end of emulsion polymerization to adjust the pH, the storage stability, freezing stability, chemical stability, etc. of the emulsion can be improved.
- the resulting emulsion is preferably adjusted to a pH of 5 to 9.
- a base such as ammonia, ethylamine, diethylamine, triethylamine, ethanolamine, triethanolamine, dimethylethanolamine, caustic soda, and caustic potash is added. substances can be used.
- acrylic polymer that serves as the matrix of the coat layer is (meth)acrylic acid alkyl ester.
- clay is blended in a predetermined ratio in combination with ground calcium carbonate described later in the continuous phase of the acrylic polymer that serves as the matrix.
- the clay used in the present invention is not particularly limited, and known clays can be used as appropriate.
- the term “clay” includes not only clay minerals having a layered structure, but also clay minerals having no layered structure, such as imogolite and allophane.
- Clay minerals having a layered structure include smectite, vermiculite, montmorillonite, bentonite, illite, hectorite, halloysite, saponite, beidellite, stevensite, nontronite, smectite, mica, brittle mica, sericite (sericite), Swelling minerals such as illite, glauconite (glauconite), hydrotalcite; zeolite), and other non-swelling minerals. Further, examples of such clays include natural clays, synthetic clays, and organized clays.
- the organized clay is not particularly limited and may include any known clay, but it is preferable that the clay is organized by an organizing agent.
- the clay before being organicized is not particularly limited as long as it is a so-called clay mineral, and any of the above examples may be used. Moreover, such clay may be a natural product or a synthetic product.
- the organic agent is not particularly limited, and any known organic agent capable of organicizing clay can be used as appropriate. Examples include hexylammonium ion, octylammonium ion, 2-ethylhexylammonium ion, , dodecyl ammonium ion, lauryl ammonium ion, octadecyl ammonium ion, dioctyldimethyl ammonium ion, trioctyl ammonium ion, dioctadecyl dimethyl ammonium ion, trioctyl ammonium ion, dioctadecyl dimethyl ammonium ion, trioctyl ammonium ion, dioctadecyl dimethyl ammonium ion, trioctadecyl ammonium ion, etc. can be used. .
- the clay used in the present invention is not particularly limited, kaolin clay is particularly preferable from the viewpoint of uniform dispersion in the coat layer.
- the particle size of the clay is not particularly limited, and depends to some extent on the thickness of the coat layer to be formed. Among them, the thickness is preferably 0.1 ⁇ m or more and 1.7 ⁇ m or less, particularly preferably 0.2 ⁇ m or more and 1.5 ⁇ m or less, and more preferably 1.0 ⁇ m or less. With such a particle size range, the clay can be blended with good dispersibility in the formed coat layer, and the desired improvement in substrate adhesion, printability, and antistatic performance described above can be achieved. It is possible to more preferably exhibit the effect of.
- the shape of the clay is not particularly limited, and may be spherical, ellipsoidal, flattened, irregular, or the like. It is desirable from the viewpoint of uniform dispersibility in the coat layer. From this point of view, the clay preferably has an aspect ratio of 5 or less, more preferably 3 or less, and still more preferably 2 or less. The above aspect ratio indicates major axis/minor axis.
- the clay it is desirable for the clay to have a uniform particle size between particles in order to uniform the in-plane properties of the coat layer.
- the specific gravity of the clay is not particularly limited, it is, for example, 1.5 to 3.0, more preferably 2.0 to 2.8. It is desirable because it can be uniformly dispersed.
- the coating layer contains heavy calcium carbonate having a predetermined particle size together with the clay.
- Heavy calcium carbonate is, as described above, calcium carbonate produced by mechanically pulverizing and classifying natural raw materials containing CaCO3 as a main component such as limestone, and is produced by chemical precipitation reaction or the like. It is clearly distinguished from light calcium carbonate (synthetic calcium carbonate).
- the heavy calcium carbonate used in the present invention has a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less as described above.
- the volume average particle diameter is, for example, 0.07 ⁇ m or more and 1.50 ⁇ m or less, preferably 0.10 ⁇ m or more and 1.00 ⁇ m or less, and particularly preferably 0.20 ⁇ m or more and 0.50 ⁇ m or less. With such a particle size range, the whiteness desired for a printing sheet can be improved, and at the same time, the smoothness of the coat layer and the glossiness of the sheet can be improved.
- the coating layer may contain other components such as additives other than those described above.
- additives include cross-linking agents, pH adjusters, thickeners, fluidity improvers, antifoaming agents, foam inhibitors, surfactants, release agents, penetrants, coloring pigments, and coloring dyes. , fluorescent brightening agents, ultraviolet absorbers, antioxidants, preservatives, antifungal agents, antibacterial agents such as zinc pyrithione, waterproofing agents, ink fixing agents, curing agents, weather resistant materials, and the like.
- each of these additives including the antibacterial agent is, for example, less than 0.40% by mass, further 0.30% by mass or less, when the total mass of the coat layer is 100% by mass. In particular, it is preferably 0.20% by mass or less.
- Antibacterial agents such as zinc pyrithione may not be contained in the coating layer at all.
- cross-linking agents examples include aldehyde-based compounds, melamine-based compounds, isocyanate-based compounds, zirconium-based compounds, titanium-based compounds, amide-based compounds, aluminum-based compounds, boric acid, borates, carbodiimide-based compounds, oxazoline-based compounds, and the like. be done.
- a cationic resin other than an acrylic resin or a polyvalent metal salt examples include polyethyleneimine-based resins, polyamine-based resins, polyamide-based resins, polyamide epichlorohydrin-based resins, polyamine epichlorohydrin-based resins, polyamidepolyamine epichlorohydrin-based resins, polydiallylamine-based resins, dicyandiamide condensates, and the like.
- Polyvalent metal salts include calcium compounds, magnesium compounds, zirconium compounds, titanium compounds, aluminum compounds and the like. Among these, calcium compounds are preferred, and calcium nitrate tetrahydrate is more preferred.
- antifoaming agent is not particularly limited, for example, mineral oil-based, polyether-based, and silicone-based antifoaming agents are used, and mineral oil-based antifoaming agents are preferred.
- Hydrophobic silica type mineral oil antifoaming agents include, but are not limited to, Nopco 8034, Nopco 8034-L, SN Deformer AP, SN Deformer H-2, SN Deformer TP-33, SN Deformer VL, SN Deformer 113, SN Deformer 154, SN Deformer 154S, SN Deformer 313, SN Deformer 314, SN Deformer 316, SN Deformer 317, SN Deformer 318, SN Deformer 319, SN Deformer 321, SN Deformer 323, SN Deformer 364, SN Deformer 414, SN Deformer 456, SN Deformer 474, SN Deformer 476-L, SN Deformer
- metal soap type mineral oil antifoaming agents include, but are not limited to, Nopco DF-122, Nopco DF-122-NS, Nopco NDW, Nopco NXZ, SN Deformer 122 -SV, SN Deformer 269, SN Deformer 1010 (manufactured by San Nopco), etc.
- amide wax type mineral oil antifoaming agents are not limited to the following, for example, Nopco 267-A, Nopco DF-124-L, SN Deformer TP-39, SN Deformer 477T, SN Deformer 477-NS, SN Deformer 479, SN Deformer 1044, SN Deformer 1320, SN Deformer 1340, SN Deformer 1360, SN Deformer 5100 (manufactured by San Nopco) ). These may be used individually by 1 type, and may use 2 or more types together. The amount of the antifoaming agent used is not particularly
- the coating layer according to the present invention has the above-described excellent effect due to the combined use of the clay and the ground calcium carbonate within a predetermined amount even with respect to fine particles other than the clay and the ground calcium carbonate having a predetermined particle size.
- other fine particles such as zinc oxide are not substantially contained.
- polymer fine particles such as (meth)acrylic acid ester resin particles typified by polymethyl methacrylate particles, and zinc oxide having a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less are substantially should not be included. Even if it is contained, it is preferably less than 0.10% by mass in the coat layer. If the coating layer contains only clay and heavy calcium carbonate having a predetermined particle size as fine particles (powder) and does not contain anything other than unavoidable impurities, the adhesiveness to the substrate and printability are particularly good. Become.
- the preparation of the coating liquid for forming the coat layer for example, when using an aqueous acrylic polymer emulsion as the acrylic polymer to be the matrix of the coat layer, the clay or its dispersion in water or the like and heavy calcium carbonate or its dispersion in water or the like are added to water, which is the dispersion medium for the aqueous acrylic polymer emulsion, and mixed with a suitable stirring or dispersing machine such as a wet colloid mill or an edged turbine. , paddle blades, etc., under the condition of rotation of 500 to 3000 rpm, and dispersing for usually 1 to 5 minutes. If the clay and heavy calcium carbonate are directly added to the acrylic polymer aqueous emulsion, they may aggregate.
- a dispersant is added in advance to the clay and/or the clay and/or the medium such as water.
- a dispersant is added in advance to the clay and/or the clay and/or the medium such as water.
- a coating liquid comprising an aqueous acrylic polymer emulsion containing 5% by mass or more and 30% by mass of heavy calcium carbonate having a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less, 65% by mass or less, It can be applied by a suitable method such as roll coating, blade coating, bar coating, brush coating, spray coating, dipping, etc., followed by drying and curing the coating layer.
- the temperature conditions for drying or curing the coating layer are not particularly limited, but the temperature can be, for example, 90 to 120°C.
- the base material contains the polyolefin resin and the inorganic powder at a mass ratio of 50:50 to 10:90. is extruded into a sheet, and through a stretching process, on one or both sides of the base sheet, clay is 35% by mass or more and 65% by mass or less by dry mass, and the volume average particle diameter is 0.05 ⁇ m or more and 2.00 ⁇ m.
- a coating solution comprising an acrylic polymer aqueous emulsion containing the following ground calcium carbonate at a ratio of 5% by mass or more to 30% by mass is applied by an appropriate method, and then the coating layer is dried and cured.
- the inorganic powder and the polyolefin resin can be mixed to form a sheet made of the inorganic powder-blended thermoplastic, even if the polyolefin resin and the inorganic powder are kneaded and melted before being put into the molding machine from the hopper.
- the polyolefin resin and the inorganic substance powder may be kneaded and melted at the same time as molding by the molding machine.
- Melt-kneading is preferably carried out by applying a high shearing stress while uniformly dispersing the inorganic powder in the polyolefin resin.
- the stretching treatment in forming the sheet is not particularly limited, and may be uniaxially or biaxially during or after the molding, or in multiple axial directions (such as stretching by a tubular method). It is possible to stretch to In the case of biaxial stretching, sequential biaxial stretching or simultaneous biaxial stretching may be used.
- the density of the sheet decreases.
- the whiteness of the sheet is improved by lowering the density.
- LBP printability In order to examine the LBP printability of the printing sheets, a color and monochrome test pattern was printed on each sheet with a laser printer (product name: Versant 80 Press, manufactured by Fuji Xerox Co., Ltd.) to check the toner fixability. was visually observed, and printability was evaluated based on the following evaluation criteria. -Evaluation Criteria ⁇ : The test pattern was printed neatly, and there was no peeling of the toner. ⁇ The test pattern is printed well, but the toner is slightly peeled off. x: The test pattern was not printed well, and the toner was remarkably peeled off.
- the surface of the coating layer slightly changed in lightness L * and chromaticity a * , but increased in chromaticity b * and slightly yellowed.
- the surface of the coating layer changed in lightness L * and chromaticity a * b * , and in particular, there was a marked increase in the value of chromaticity b * , and the surface turned yellow.
- Aqueous acrylic polymer emulsion M1 n-butyl acrylate, methyl methacrylate, 2-ethylhexyl acrylate, methacrylic acid, vinyl acetate, and a rosin derivative in a mass ratio of 26:16:44:8:6:3
- Aqueous emulsion (solid content: water 50:50 (mass ratio)) of (meth)acrylic acid alkyl ester copolymer containing Ma: Contains styrene, benzyl acrylate, butyl acrylate, 1,6-hexanediol dimethacrylate, and 2-hydroxyethyl methacrylate at a mass ratio of 84.0:26.0:32.0:0.1:0.9
- Clay C1 Kaolin clay (volume average particle size 0.29 ⁇ m, specific gravity 2.5)
- C2 Kaolin clay (volume average particle size 1.50 ⁇ m, specific gravity 2.6)
- H1 heavy calcium carbonate (volume average particle size 0.25 ⁇ m, specific gravity 2.6)
- H2 Heavy calcium carbonate (volume average particle size 0.34 ⁇ m, specific gravity 2.6)
- H3 Heavy calcium carbonate (volume average particle size 3.00 ⁇ m, specific gravity 2.6)
- L1 light calcium carbonate (volume average particle size 0.05 ⁇ m, specific gravity 2.6)
- L2 light calcium carbonate (volume average particle size 1.00 ⁇ m, specific gravity 2.6)
- Examples 1 to 6, Comparative Examples 1 to 8, and Reference Example 1 The water-based acrylic polymer emulsion, the type and amount of clay added, and the type and amount of calcium carbonate added were blended as shown in Table 1 below, and stirred and mixed using an edged turbine at 3000 rpm for 3 minutes to form a coating layer. A coating solution was prepared. The added amounts of clay and calcium carbonate shown in Table 1 are values in terms of dry mass of the aqueous acrylic polymer emulsion. In addition, water was used as a dispersion medium and the solid content concentration was set to 46% by mass in any of the coating liquids for the coating layers.
- any coating liquid for the coating layer 0.1% by mass of a surfactant as a dispersant and 0.1% by mass of a hydrophobic silica type mineral oil antifoaming agent as an antifoaming agent were blended. These dispersants and antifoaming agents are not essential components, and it was possible to prepare the coating solution for the coating layer without adding them.
- the coating layer coating solution prepared in this manner is applied to the surface of the base material by the microgravure method so as to have a predetermined film thickness shown in Table 1, and dried at 110° C. for printing. created a sheet. Adhesion, surface resistivity, whiteness, LBP printability, offset printability, water resistance, and weatherability of each printing sheet obtained were measured under the conditions described above. Table 2 shows the results obtained.
- Each of the printing sheets of Examples containing a coating layer containing predetermined amounts of talc and heavy calcium carbonate having a specific particle size according to the present invention has excellent adhesion and adhesion of the coating layer to the substrate, and has whiteness, It exhibited sufficiently good properties in terms of LBP printability, oil-based offset printability, surface resistivity, water resistance, and weather resistance.
- the printing sheets of Comparative Examples 1, 3, and 4 which contain light calcium carbonate as well as clay in the coating layer, are excellent in properties such as printability, and the adhesiveness was also good in the first evaluation result.
- the evaluation results after repeated application and peeling were inferior to those of the printing sheets of the examples according to the present invention.
- the printing sheet of Comparative Example 2 in which heavy calcium carbonate H3 having a volume average particle size of 3.00 ⁇ m was included in the coat layer together with talc, had poor printability and low adhesiveness of the coat layer.
- the importance of using heavy calcium carbonate with a volume average particle size of 0.05 ⁇ m or more and 2.00 ⁇ m or less as the calcium carbonate powder was shown.
- Comparative Example 5 which has only a conventional acrylic coating layer, the adhesiveness is poor, and there are problems in terms of LBP printability, offset printability, surface resistivity, water resistance, and weather resistance. It was transformative. Moreover, in Comparative Example 6, in which only clay was used and heavy calcium carbonate was not added, there was some inferiority in terms of offset printability, water resistance, and weather resistance.
- a printing sheet having a coating layer for receiving ink on at least one surface of a base material has excellent printability, good antistatic performance, and prevents paper jams during printing.
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Abstract
Description
前記重質炭酸カルシウムの体積平均粒子径が、0.05μm以上2.00μm以下であることを特徴とする印刷用シートが示される。
本発明の印刷用シートは、シート状の基材と、基材の少なくとも一方の表面に形成されたコート層とを備えるものであり、このコート層として、アクリル系ポリマーからなる連続相中にクレイが35質量%以上65質量%以下、体積平均粒子径が0.05μm以上2.00μm以下の重質炭酸カルシウムが5質量%以上30質量%以下の割合で配合されてなるものを有する。
本発明の印刷用シートにおける基材の材質としては、特に限定されず、樹脂系材料を主成分とするプラスチックシートから構成されていても良いし、紙系の材料から構成されていても良く、合成紙から構成されていても良い。更に、基材としては、無機物質粉末を熱可塑性プラスチック中に高充填してなる無機物質粉末配合熱可塑性プラスチックからなるシート、特に、ポリオレフィン系樹脂と無機物質粉末とを質量比50:50~10:90の割合で含有する無機物質粉末配合熱可塑性プラスチックからなるシートを用いることが、環境保全の観点から、また機械的強度、耐熱性等の特性が向上する観点から好ましい。
前記プラスチックシート、あるいは前記無機物質粉末配合熱可塑性プラスチックシートを構成する樹脂としては、特に限定されるものではなく、印刷用シートの用途、機能等に応じて、各種のものが用いられ得る。例えば、ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリメチル-1-ペンテン、エチレン-環状オレフィン共重合体等のポリオレフィン系樹脂;エチレン-酢酸ビニル共重合体、エチレン-アクリル酸共重合体、エチレン-メタクリル酸共重合体、エチレン-メタクリル酸共重合体の金属塩(アイオノマー)、エチレン-アクリル酸アルキルエステル共重合体、エチレン-メタクリル酸アルキルエステル共重合体、マレイン酸変性ポリエチレン、マレイン酸変性ポリプロピレン等の官能基含有ポリオレフィン系樹脂;ナイロン-6、ナイロン-6,6、ナイロン-6,10、ナイロン-6,12等のポリアミド系樹脂;ポリエチレンテレフタレート及びその共重合体、ポリエチレンナフタレート、ポリブチレンテレフタレート等の芳香族ポリエステル系樹脂、ポリブチレンサクシネート、ポリ乳酸等の脂肪族ポリエステル系樹脂等の熱可塑性ポリエステル系樹脂;芳香族ポリカーボネート、脂肪族ポリカーボネート等のポリカーボネート樹脂;アタクティックポリスチレン、シンジオタクティックポリスチレン、アクリロニトリル-スチレン(AS)共重合体、アクリロニトリル-ブタジエン-スチレン(ABS)共重合体等のポリスチレン系樹脂;ポリ塩化ビニル、ポリ塩化ビニリデン等のポリ塩化ビニル系樹脂;ポリフェニレンスルフィド;ポリエーテルスルフォン、ポリエーテルケトン、ポリエーテルエーテルケトン等のポリエーテル系樹脂等が挙げられる。これらは、1種を単独又は2種以上を組み合わせて用いることができる。
上記した様に、基材が無機物質粉末配合熱可塑性プラスチックシートである場合における、当該シート中に配合され得る無機物質粉末としては、特に限定されず、例えば、カルシウム、マグネシウム、アルミニウム、チタン、鉄、亜鉛等の炭酸塩、硫酸塩、珪酸塩、リン酸塩、ホウ酸塩、酸化物、若しくはこれらの水和物の粉末状のものが挙げられ、具体的には、例えば、炭酸カルシウム、炭酸マグネシウム、酸化亜鉛、酸化チタン、シリカ、アルミナ、クレイ、タルク、カオリン、水酸化アルミニウム、水酸化マグネシウム、珪酸アルミニウム、珪酸マグネシウム、珪酸カルシウム、硫酸アルミニウム、硫酸マグネシウム、硫酸カルシウム、リン酸マグネシウム、硫酸バリウム、珪砂、カーボンブラック、ゼオライト、モリブデン、珪藻土、セリサイト、シラス、亜硫酸カルシウム、硫酸ナトリウム、チタン酸カリウム、ベントナイト、黒鉛等が挙げられる。これらは合成のものであっても天然鉱物由来のものであっても良く、また、これらは単独又は2種類以上併用して使用され得る。
また、基材が、前記プラスチックシート、あるいは前記無機物質粉末配合熱可塑性プラスチックシートである場合には、その組成中に、必要に応じて、補助剤としてその他の添加剤を配合することも可能である。その他の添加剤としては、例えば、可塑剤、色剤、滑剤、カップリング剤、流動性改良材、分散剤、酸化防止剤、紫外線吸収剤、難燃剤、安定剤、帯電防止剤、発泡剤等が挙げられる。これらの添加剤は、単独で用いても良く、2種以上を併用しても良い。
基材が紙系の材料から構成される場合の具体例として、グラシン紙、コート紙、上質紙、無塵紙、含浸紙等の紙基材、及び上記の紙基材にポリエチレン等の熱可塑性樹脂をラミネートしたラミネート紙が挙げられる。
基材は上記した材料より構成される一層のシートにより構成されていても良いし、あるいは複数層が積層されて基材を構成していても良い。また、基材が前記プラスチックシートあるいは前記無機物質粉末配合熱可塑性プラスチックシートの場合には、当該シートは未延伸のものであっても良いし、縦又は横等の一軸方向又は二軸方向に延伸されたものであっても良い。
本発明の印刷用シートが有するコート層は、前記基材の片面のみに設けられても良く、両面に設けられても良い。このコート層の厚さとしては、特に限定されるものではないが、例えば、1μm以上10μm以下であることが好ましく、2μm以上8μm以下であることがより好ましく、3μm以上5μm以下であることが特に好ましい。この範囲内の厚さであると、コート層が、インクの受容層として十分に機能し良好な着色性、発色性等といったインク受容特性を発揮し、かつ、印刷用シートの耐水性、表面の帯電防止性、インクとの密着性等といった特性も良好となる。
コート層のマトリックスとなるアクリル系ポリマーとしては、(メタ)アクリル酸、(メタ)アクリル酸エステル、(メタ)アクリルアミド類、及び(メタ)アクリロニトリルを主たるモノマー成分として得られる重合物が含まれる。なお、本明細書において用いられる「(メタ)アクリル」との用語は、「アクリル」と「メタクリル」との双方を含む意味で用いているものである。
アクリル酸、メタクリル酸;
例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸n-プロピル、アクリル酸イソプロピル、アクリル酸n-ブチル、アクリル酸イソブチル、アクリル酸t-ブチル、アクリル酸ヘキシル、アクリル酸n-オクチル、アクリル酸-2-エチルヘキシル、アクリル酸イソオクチル、アクリル酸ノニル、アクリル酸ラウリル、アクリル酸ステアリル、アクリル酸パルミチル又はアクリル酸シクロヘキシル等のアルキル基の炭素数が1~18のアクリル酸アルキルエステル;
例えば、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n-プロピル、メタクリル酸イソプロピル、メタクリル酸n-ブチル、メタクリル酸イソブチル、メタクリル酸t-ブチル、メタクリル酸ヘキシル、メタクリル酸n-オクチル、メタクリル酸-2-エチルヘキシル、メタクリル酸イソオクチル、メタクリル酸ノニル、メタクリル酸ラウリル、メタクリル酸ステアリル、メタクリル酸パルミチル及びメタクリル酸シクロヘキシル等のアルキル基の炭素数が1~18のメタクリル酸アルキルエステル;
例えば、アクリル酸2-ヒドロキシエチル、メタクリル酸2-ヒドロキシエチル、アクリル酸2-ヒドロキシプロピル、メタクリル酸2-ヒドロキシプロピル、アクリル酸4-ヒドロキシブチル、メタクリル酸4-ヒドロキシブチル、フタル酸モノヒドロキシエチルアクリレート等の(メタ)アクリル酸の側鎖に水酸基を有するアルキルエステル;
例えば、エチレングリコール単位を分子内に持つポリエチレングリコール(nは3以上20以下が望ましい。)ジアクリレート、トリメチロールプロパンEO変性(nは3以上20以下が望ましい。)トリアクリレート、フェノールEO変性(nは3以上20以下が望ましい。)アクリレート、
例えば、アリルオキシエチルアクリレートやアリルオキシエチルメタクリレート等の(メタ)アクリル酸のアルケニルオキシアルキルエステル、
例えば、アクリル酸メトキシブチル、メタクリル酸メトキシブチル、アクリル酸メトキシエチル、メタクリル酸メトキシエチル、アクリル酸エトキシブチル、メタクリル酸エトキシブチル等の(メタ)アクリル酸の側鎖にアルコキシル基を有するアルキルエステル;
例えば、アクリル酸アリルやメタクリル酸アリル等の(メタ)アクリル酸のアルケニルエステル;
例えば、アクリル酸グリシジル、メタクリル酸グリシジル、並びにアクリル酸メチルグリシジルやメタクリル酸メチルグリシジル等のアクリル酸の側鎖にエポキシ基を有するアルキルエステル;
例えば、アクリル酸ジエチルアミノエチル、メタクリル酸ジエチルアミノエチル、アクリル酸メチルアミノエチル、メタクリル酸メチルアミノエチル等の(メタ)アクリル酸のモノ-又はジ-アルキルアミノアルキルエステル;
例えば、側鎖としてシリル基、アルコキシシリル基又は加水分解性アルコキシシリル基等を有するシリコーン変性(メタ)アクリル酸エステル;
例えば、アクリルアミド、メタクリルアミド;
例えば、N-メチロールアクリルアミド及びN-メチロールメタクリルアミド等のメチロール基を有する(メタ)アクリルアミド;
例えば、N-アルコキシメチロールアクリルアミド(例えば、N-イソブトキシメチロールアクリルアミド等)、及びN-アルコキシメチロールメタクリルアミド(例えば、N-イソブトキシメチロールメタクリルアミド等)等のアルコキシメチロール基を有する(メタ)アクリルアミド;
例えば、N-ブトキシメチルアクリルアミドやN-ブトキシメチルメタクリルアミド等のアルコキシアルキル基を有する(メタ)アクリルアミド;及び、
アクリロニトリル、メタクリロニトリル等の各種のアクリル系単量体も前記アクリル系樹脂を構成するモノマー成分として挙げることができる。
更に、アクリル系ポリマーに光硬化反応等により架橋構造を導入し、コート層の皮膜強度を高めようとする場合には、2官能乃至は多官能のアクリル系モノマー、具体的には例えば、1,4-ブタンジオールジ(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、ネオペンチルグリコールジ(メタ)アクリレート、上記ポリエチレングリコールジ(メタ)アクリレート、ヒドロキシピバリン酸ネオペンチルグリコールジ(メタ)アクリレート、ジシクロペンタニルジ(メタ)アクリレート、カプロラクトン変性ジシクロペンテニルジ(メタ)アクリレート、エチレンオキシド変性リン酸ジ(メタ)アクリレート、アリル化シクロヘキシルジ(メタ)アクリレート、イソシアヌレートジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、ジペンタエリスリトールトリ(メタ)アクリレート、プロピオン酸変性ジペンタエリスリトールトリ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレート、プロピレンオキシド変性トリメチロールプロパントリ(メタ)アクリレート、トリス(アクリロキシエチル)イソシアヌレート、ペンタエリスリトールテトラ(メタ)アクリレート、ジペンタエリスリトールペンタ(メタ)アクリレート、プロピオン酸変性ジペンタエリスリトールペンタ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート、カプロラクトン変性ジペンタエリスリトールヘキサ(メタ)アクリレート等の多官能(メタ)アクリレートを配合することも可能である。
すなわち、本発明でコート層の連続相を構成するアクリル系ポリマーは、上記に例示の各種のモノマー成分の内の何れかのみから構成されるホモポリマーであっても、上記に例示する各種モノマー成分を複数組み合わせてなるコポリマー(共重合体)であっても良い。
更に、本発明の一実施態様においては、上記モノマー成分以外に他のモノマー成分を含有するコポリマーをアクリル系ポリマーとして用い得る。
さらに本発明においては、マトリックスとなるアクリル系ポリマーの連続相に、後述する重質炭酸カルシウムと組み合わせて、所定の割合でクレイを配合する。
本発明において、前記コート層は、上記クレイと共に、所定粒子径の重質炭酸カルシウムを含有する。「重質炭酸カルシウム」とは、前述したように、石灰石等CaCO3を主成分とする天然原料を機械的に粉砕分級して製造される炭酸カルシウムであり、化学的沈殿反応等によって製造される軽質炭酸カルシウム(合成炭酸カルシウム)とは明確に区別される。
本発明において、前記コート層は、上記以外の添加剤等の他の成分を含有しても良い。
添加剤としては、具体的には、架橋剤、pH調整剤、増粘剤、流動性改良剤、消泡剤、抑泡剤、界面活性剤、離型剤、浸透剤、着色顔料、着色染料、蛍光増白剤、紫外線吸収剤、酸化防止剤、防腐剤、防黴剤、ジンクピリチオン等の抗菌剤、耐水化剤、インク定着剤、硬化剤、耐候材料等が挙げられる。なお、抗菌剤を始めとするこれら各添加剤それぞれの配合量は、コート層の全体の質量を100質量%とした場合に、例えば0.40質量%未満、さらには0.30質量%以下、特に0.20質量%以下であることが好ましい。ジンクピリチオン等の抗菌剤については、コート層中に全く含まれない態様であってもよい。
本発明の印刷用シートの製造方法としては、公知の基材表面にコート層を形成する方法を使用することができ、例えば、基材の片面又は両面に、乾燥質量でクレイが35質量%以上65質量%以下、体積平均粒子径が0.05μm以上2.00μm以下の重質炭酸カルシウムが5質量%以上30質量%の割合で配合されてなるアクリル系ポリマー水性エマルジョンからなる塗工液を、ロールコート、ブレードコート、バーコート、刷毛塗り、スプレーコート、ディッピング等の適当な手法により、塗工し、その後、コート層を乾燥、硬化することによって行い得る。コート層の乾燥又は硬化の際の温度条件としては、特に限定されるものではないが、例えば90~120℃の温度にて行い得る。
なお、シート状に押出し成形する時における成形温度としては、同様の温度で成形することが好ましい。
以下の実施例及び比較例においての各物性値はそれぞれ以下の方法により評価されたものである。
基材に対するコート層の密着性を調べるために、セロハン粘着テープによる剥離試験を行った。
・測定用テープ
JIS Z1522:2009に準拠するセロハン粘着テープ(幅:24mm)
・測定手順-1
(1)約75mmの長さにテープを取り出す。
(2)測定するシートにテープを貼り、透けて見える様に指でテープを擦る。なおこの際、爪を立てずに指の平で押すこととする。
(3)テープを貼って5分以内に、テープの端部を持ち上げ引き剥がし方向とコート層とが約60°の角度をなす様にして、0.5~1.0秒で確実に引き離す。剥離面を観察し、塗工層が付着しているかを目視により観察し、以下の評価基準に基づき、コート層と基材との密着性を評価する。
・評価基準
○ コート層の剥離が全くない。
△ コート層の剥離が20%未満である。
× コート層の剥離が20%以上である。
・測定手順-2
上記評価結果が〇であった試料については、上記(1)~(3)の操作をさらに5回繰り返し(貼付・剥離回数:各全6回)、コート層の剥離が見られなかった試料を「◎」と評価した。
JIS K 6911:2006に準拠して測定した。測定には、試料を100mm角のシートとして用い、以下の条件で測定を行った。
温度23℃、湿度50%
印刷用シート製造直後において、コート層表面の状態を目視観察し、L*a*b*色空間色度図に対比して白色度(b*)を測定した。
印刷用シートのLBP印刷適性を調べるために、各シートに対して、レーザープリンター(製品名:Versant 80 Press、富士ゼロックス株式会社製)にて、カラー及びモノクロテストパターンを印刷し、トナーの定着性を目視により観察し、以下の評価基準に基づき、印刷適性を評価した。
・評価基準
○ テストパターンが綺麗に印刷され、トナーの剥離が全くない。
△ テストパターンが良好に印刷されているが、トナーの剥離がやや生じている。
× テストパターンがうまく印刷されず、トナーの剥離が著しく生じている。
印刷用シートのオフセット印刷適性を調べるために、各シートに対して、オフセット印刷機(製品名:RMGT920、リョービMHIグラフィックテクノロジー株式会社製)にて、油性オフセットインクを用いてテストパターンを印刷し、印刷のにじみ、ずれの定着性を目視により観察し、以下の評価基準に基づき、オフセット印刷適性(インク速乾性)を評価した。
・評価基準
○ テストパターンが綺麗に印刷され、印刷のにじみ、ずれが全くない。
△ テストパターンが良好に印刷されているが、印刷のにじみ、ずれがやや生じている。
× テストパターンがうまく印刷されず、印刷のにじみ、ずれが著しい。
濡らしたキムワイプ(日本製紙クレシア製 商品名)でコート層の表面を10秒間こすり、水跡が残らないかを目視観察し、以下の評価基準に基づき、耐水性を評価した。
・評価基準
○ コート層の表面に水跡が全く残らない。
△ コート層の表面に染みた様な水跡がわずかながら発生する。
× コート層の表面に染みた様な水跡が著しく残る。
メタルハライドウェザー試験において、ブラックパネル温度63℃(±2℃)、湿度50%(±5%)、照度1200W/m2で24時間試験して、コート層表面の試験前後の状態を目視観察し、L*a*b*色空間色度図に対比して色を測定し、以下の評価基準に基づき評価した。
・評価基準
○ コート層の表面の試験前後において、明度L*及び色度a*b*の変化がほとんどなく黄変が実質的に生じていない。
△ コート層の表面の試験前後において、明度L*及び色度a*の変化はわずかであるが、色度b*の値の増加があり、わずかに黄変している。
× コート層の表面の試験前後において、明度L*及び色度a*b*の変化があり、特に色度b*の値の著しい増加があり、黄変している。
以下の実施例及び比較例において使用した成分はそれぞれ以下のものであった。
S1:ポリプロピレン単独重合体(融点160℃)36.0質量部と、無機物質粉末として平均粒子径2.2μm(JIS M-1511に準じた空気透過法による平均粒子径)の重質炭酸カルシウム粉末60.0質量部と、更に滑剤としてアルカンスルホン酸ナトリウム(アルキル基の炭素数(平均値)=12)2.0質量部を、二軸スクリューを装備した押出成形機(Tダイ押出成形装置φ20mm、L/D=25)に投入し、220℃以下の温度で混練し、混練した原料を成形温度220℃でTダイによりシート成形し、引き取り機で巻き取りながら延伸して基材となる無機物質粉末配合熱可塑性プラスチックからなるシートを作成した。なお、この様にして得られたシートの肉厚は200μmであった。
M1:アクリル酸n-ブチル、メタクリル酸メチル、アクリル酸2-エチルヘキシル、メタクリル酸、酢酸ビニル、ロジン誘導体とを、質量比26:16:44:8:6:3の割合で含有してなる(メタ)アクリル酸アルキルエステル共重合体の水性エマルジョン(固形分:水=50:50(質量比))
Ma:スチレン、ベンジルアクリレート、ブチルアクリレート、1,6-ヘキサンジオールジメタクリレート、2-ヒドロキシエチルメタクリレートとを、質量比84.0:26.0:32.0:0.1:0.9で含有してなるスチレン-アクリル酸エステル共重合体の水性エマルジョン(固形分:水=20:80(質量比))
C1:カオリンクレイ(体積平均粒子径0.29μm、比重2.5)
C2:カオリンクレイ(体積平均粒子径1.50μm、比重2.6)
H1:重質炭酸カルシウム(体積平均粒子径0.25μm、比重2.6)
H2:重質炭酸カルシウム(体積平均粒子径0.34μm、比重2.6)
H3:重質炭酸カルシウム(体積平均粒子径3.00μm、比重2.6)
L1:軽質炭酸カルシウム(体積平均粒子径0.05μm、比重2.6)
L2:軽質炭酸カルシウム(体積平均粒子径1.00μm、比重2.6)
アクリル系ポリマー水性エマルジョン、クレイの種類及び添加量、炭酸カルシウムの種類及び添加量をそれぞれ、下記表1に示すものとして配合し、エッジドタービンを用いて3000rpmで3分間攪拌混合して、コート層塗工液を調製した。なお、表1において示すクレイ及び炭酸カルシウムの添加量は、アクリル系ポリマー水性エマルジョンの乾燥質量換算の値である。なお、何れのコート層塗工液においても、分散媒として水を用い、固形分濃度は46質量%とした。また、何れのコート層塗工液においても、分散剤として界面活性剤を0.1質量%及び消泡剤として疎水性シリカタイプの鉱物油系消泡剤を0.1質量%配合したが、これらの分散剤及び消泡剤は必須の成分ではなく、これらを加えなくとも、コート層塗工液を調製することは可能であった。この様にして調製したコート層塗工液を、前記した基材表面に、表1に示す所定の膜厚となる様にマイクログラビア法によって塗工し、110℃にて乾燥させて、印刷用シートを作成した。得られた各印刷用シートに関して、接着性、表面抵抗率、白色度、LBP印刷適性、オフセット印刷適性、耐水性、耐候性に関して上記した条件により測定した。得られた結果を表2に示す。
Claims (8)
- 基材の片面又は両面に、アクリル系ポリマーからなる連続相中にクレイが35質量%以上65質量%以下、重質炭酸カルシウムが5質量%以上30質量%以下の割合で配合されてなるコート層を有している印刷用シートであって、
前記重質炭酸カルシウムの体積平均粒子径が、0.05μm以上2.00μm以下であることを特徴とする印刷用シート。 - 前記基材が、ポリオレフィン系樹脂と無機物質粉末とを質量比50:50~10:90の割合で含む基材である請求項1に記載の印刷用シート。
- 前記無機物質粉末が炭酸カルシウム粉末である請求項2に記載の印刷用シート。
- 前記クレイの体積平均粒子径が、0.05μm以上2.00μm以下である請求項1~3の何れかに記載の印刷用シート。
- 前記アクリル系ポリマーが(メタ)アクリル酸アルキルエステルである請求項1~4の何れかに記載の印刷用シート。
- 前記(メタ)アクリル酸アルキルエステルが、アクリル酸メチル、アクリル酸エチル、アクリル酸n-プロピル、アクリル酸イソプロピル、アクリル酸n-ブチル、アクリル酸イソブチル、アクリル酸n-オクチル、アクリル酸-2-エチルヘキシル、アクリル酸イソオクチル、アクリル酸ノニル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸n-プロピル、メタクリル酸イソプロピル、メタクリル酸n-ブチル、メタクリル酸イソブチル、メタクリル酸n-オクチル、メタクリル酸-2-エチルヘキシル、メタクリル酸イソオクチル、アクリル酸2-ヒドロキシエチル、メタクリル酸2-ヒドロキシエチル、アクリル酸2-ヒドロキシプロピル、メタクリル酸2-ヒドロキシプロピルからなる群から選択される1種もしくは2種以上のものである請求項5に記載の印刷用シート。
- 基材の片面又は両面に、アクリル系ポリマーからなる連続相中に乾燥質量でクレイが35質量%以上65質量%以下、体積平均粒子径が0.05μm以上2.00μm以下の重質炭酸カルシウムが5質量%以上30質量%以下の割合で配合されてなるアクリル系ポリマー水性エマルジョンを塗工することを特徴とする印刷用シートの製造方法。
- ポリオレフィン樹脂と無機物質粉末とを質量比50:50~10:90の質量比で含む基材をシート状に押出し成形し、延伸処理工程を介して、基材シートの片面又は両面に前記アクリル系ポリマー水性エマルジョンを塗工することを特徴とする請求項7に記載の印刷用シートの製造方法。
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