WO2010101020A1 - 感熱記録体及びその製造方法 - Google Patents
感熱記録体及びその製造方法 Download PDFInfo
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- WO2010101020A1 WO2010101020A1 PCT/JP2010/052271 JP2010052271W WO2010101020A1 WO 2010101020 A1 WO2010101020 A1 WO 2010101020A1 JP 2010052271 W JP2010052271 W JP 2010052271W WO 2010101020 A1 WO2010101020 A1 WO 2010101020A1
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- Prior art keywords
- heat
- sensitive recording
- recording material
- layer
- parts
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering 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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/04—Direct thermal recording [DTR]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
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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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
Definitions
- Item 3 The thermal recording material according to Item 1 or 2, wherein the pigment contains 20 to 70% by mass of at least one selected from a layered silicate compound and colloidal silica with respect to the total solid content of the uppermost layer.
- Item 11 The content of at least one selected from the polyethylene oxide, xanthan gum and sodium polyacrylate is 0.05 to 0.5% by mass with respect to the total solid content of the uppermost layer.
- Item 12 By irradiating an ultraviolet ray or an electron beam onto a support, a heat-sensitive recording layer containing a leuco dye and a developer, an intermediate layer containing an aqueous adhesive, and an ultraviolet ray or electron beam curable resin composition
- a heat-sensitive recording layer containing a leuco dye and a developer
- an intermediate layer containing an aqueous adhesive
- an ultraviolet ray or electron beam curable resin composition In the method for producing a heat-sensitive recording material in which a cured protective layer is sequentially provided, an uppermost layer coating solution containing a water-based adhesive and a pigment having an average particle diameter of 100 nm or less is further applied onto the protective layer and dried.
- the heat-sensitive recording layer generally uses water as a dispersion medium, for example, a leuco dye, a developer, and, if necessary, an additive such as a sensitizer and a preservability improver, either together or separately, with stirring or ball mill, attritor, sand mill, etc.
- a thermosensitive recording layer coating solution prepared by mixing a dispersion liquid finely pulverized with a pulverizer so that the average particle diameter is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, and an adhesive, preferably an aqueous adhesive.
- the coating is applied and dried on the support so that the coating amount after drying is preferably about 2 to 20 g / m 2 , more preferably about 3 to 10 g / m 2 .
- the heat-sensitive recording layer coating liquid may contain other commonly used additives other than those described above.
- other additives include surfactants, waxes, lubricants, pigments, water resistance agents (crosslinking agents), antifoaming agents, fluorescent whitening agents, and coloring dyes.
- surfactants include dioctyl sulfosuccinic acid sodium salt, dodecylbenzene sulfonic acid sodium salt, lauryl alcohol sulfate sodium salt, fatty acid alkali metal salts such as sodium stearate, fluorine-based surfactants such as perfluoroalkylethylene oxide adducts, etc. Is mentioned.
- waxes examples include carnauba wax, paraffin wax, and ester wax.
- lubricants include alkyl phosphates such as potassium stearyl phosphate, fatty acid metal salts such as zinc stearate and calcium stearate, and polyethylene wax.
- examples of the pigment include kaolin, clay, talc, calcium carbonate, calcined kaolin, titanium oxide, amorphous silica, and aluminum hydroxide.
- Water-proofing agents include glyoxal, formalin, glycine, glycidyl ester, glycidyl ether, dimethylol urea, ketene dimer, dialdehyde starch, melamine resin, polyamide resin, polyamide-epichlorohydrin resin, ketone-aldehyde resin, borax Boric acid, ammonium zirconium carbonate, epoxy compounds, hydrazine compounds, oxazoline group-containing compounds, and the like.
- the present invention by providing an intermediate layer containing an aqueous adhesive on the heat-sensitive recording layer, it is possible to suppress a decrease in glossiness caused by melting and softening the heat-sensitive recording layer due to the heat of the thermal head. Moreover, the barrier property with respect to an ultraviolet-ray or an electron beam curable resin composition is exhibited, and preservation
- Examples of the water-based adhesive constituting the intermediate layer include a water-based adhesive contained in the heat-sensitive recording layer.
- various modified polyvinyl alcohols are preferable.
- Diacetone-modified polyvinyl alcohol and casein are preferred.
- the amount of the water-based adhesive used is not particularly limited, but is preferably about 20 to 80% by mass with respect to the total solid content of the intermediate layer from the viewpoint of excellent barrier sensitivity and recording sensitivity.
- the thermal recording layer coating solution and the intermediate layer coating solution may be applied and dried one by one, or the same coating solution may be applied in two or more layers. Also, two or more layers can be applied simultaneously.
- the coating method for example, slot die coating, slide bead coating, curtain coating, air knife coating, blade coating, gravure coating, micro gravure coating, bar coating, rod coating, roll coating and the like are used.
- a known smoothing process such as a super calendar or a soft calendar may be performed.
- the smoothing treatment may be carried out by bringing the thermal recording layer side into contact with either a metal roll or an elastic roll.
- a treatment such as corona discharge, ultraviolet ray or electron beam irradiation to the support surface, the suitability of the protective layer is improved, and a protective layer having a uniform thickness is formed. Further, it is possible to reduce the coating defects of the heat-sensitive recording layer, and to improve the adhesion between the support and the heat-sensitive recording layer.
- Examples of the resin constituting the ultraviolet ray or electron beam curable resin composition include prepolymers and monomers.
- the prepolymer include (a) aliphatic, alicyclic, and araliphatic poly (meth) acrylates of 2- to 6-valent polyhydric alcohols and polyalkylene glycols; (b) aliphatic, alicyclic, and aromatic A poly (meth) acrylate of a polyhydric alcohol in which an alkylene oxide is added to an aliphatic or aromatic divalent to hexavalent polyhydric alcohol; (c) a poly (meth) acryloyloxyalkyl phosphate ester; (d) a polyester (E) epoxy poly (meth) acrylate; (f) polyurethane poly (meth) acrylate; (g) polyamide poly (meth) acrylate; (h) polysiloxane poly (meth) acrylate; (i) A vinyl or diene-based low polymer having a (meth)
- Examples of the monomer include (a) carboxyl group-containing monomers represented by ethylenically unsaturated mono- or polycarboxylic acid, and carboxyl group-containing monomers such as alkali metal salts, ammonium salts, and amine salts thereof.
- vinyl lactams such as ethylenically unsaturated (meth) acrylamide or alkyl-substituted (meth) acrylamide, N-vinylpyrrolidone
- Sulfonic acid group-containing monomers represented by sulfonic acids and sulfonic acid group-containing monomers such as alkal
- the main body means one of the most abundant components in the whole, and in the case of two components, it means containing about 50% by mass or more of the whole, and “(meth) acrylic acid” It means “methacrylic acid” and / or “acrylic acid”.
- the protective layer in the present invention preferably contains a filler.
- a filler preferably contains a filler.
- the average thickness of a protective layer is more than the average particle diameter of a filler from a viewpoint of improving glossiness.
- the filler include, for example, kaolin, calcined kaolin, calcium carbonate, barium carbonate, zinc carbonate, zinc oxide, aluminum oxide, titanium dioxide, silicon dioxide, aluminum hydroxide, barium sulfate, zinc sulfate, calcium silicate, talc, Inorganic pigments such as amorphous silica, spherical silica, alumina, diatomaceous earth, calcined diatomaceous earth, mica, magnesium oxide, magnesium carbonate, aluminosilicate, activated clay, montmorillonite, synthetic zeolite, colloidal silica, and these inorganic pigments are organic.
- cubic synthetic zeolite and spherical silica are particularly preferable from the viewpoint of improving glossiness and recording image quality.
- the filler content is preferably 1 to 15% by mass, more preferably 2 to 12% by mass, based on the total solid content of the protective layer. By setting it as 1 mass% or more, sticking can be suppressed and the scraping property of sebum dirt can be remarkably improved. By setting the content to 15% by mass or less, the glossiness can be further increased.
- the glossiness of the surface of the protective layer based on JIS P 8142-1993 is set to 90% or more, and the surface of the uppermost layer side is 75 ° C. It can be suitably adjusted so that the glossiness is 90% or more and the glossiness of 20 degrees is 35% or more. In addition, the recording image quality and folding resistance can be improved.
- the average particle diameter of the filler used in the protective layer is measured by, for example, a laser diffraction / scattering method (SALD2200 manufactured by Shimadzu Corporation, LB-500 manufactured by Horiba, Ltd., MT3300 manufactured by Nikkiso Co., Ltd.), centrifugal sedimentation method, Coulter counter It can be measured by a commonly used measuring device such as an electron microscope.
- SALD2200 manufactured by Shimadzu Corporation, LB-500 manufactured by Horiba, Ltd., MT3300 manufactured by Nikkiso Co., Ltd.
- centrifugal sedimentation method Coulter counter It can be measured by a commonly used measuring device such as an electron microscope.
- the protective layer is prepared by, for example, applying a protective layer coating solution prepared by mixing ultraviolet or electron beam curable resin, if necessary, a filler with an appropriate mixing stirrer such as a three-roll mill or a mixer onto the intermediate layer. It is formed. Prior to application of the protective layer coating solution, the surface of the intermediate layer can be subjected to corona discharge treatment or the like in order to enhance the adhesion between the intermediate layer and the protective layer.
- a coating method for example, various known coating methods such as offset gravure coating, air knife coating, Mayer bar coating, blade coating, reverse roll coating, and slit die coating can be used.
- a resin other than an ultraviolet ray or an electron beam curable resin such as an acrylic resin, a silicone resin, an alkyd resin, a fluororesin, or a butyral resin, as necessary, as long as the effects of the present invention are not impaired.
- Additives such as antifoaming agents, leveling agents, lubricants, surfactants, plasticizers, ultraviolet absorbers, fluorescent dyes, colored dyes, fluorescent pigments and colored pigments can be appropriately added. Furthermore, from the viewpoint of preventing sticking, zinc stearate or the like may be contained as a lubricant.
- curing can be promoted by adding a photopolymerization initiator to the ultraviolet ray or electron beam curable resin composition.
- a photoinitiator is not limited and various well-known things can be used. For example, methyl benzoylbenzoate, benzoin, benzyldimethyl ketal, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1- [4- (methylthio) phenyl] -2- Morpholino-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4-diethylthioxanthone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, camphorquinone , Anthracene, benzyl, phenylmethylglyoxylate and the like.
- the content of the photopolymerization initiator is preferably about 0.05 to 10 parts by mass with respect to 100 parts by mass of the ultraviolet ray or electron beam curable resin. More preferably, it is about 0.1 to 5 parts by mass. By setting the content to 0.05 parts by mass or more, curing can be effectively promoted. On the other hand, if it exceeds 10 parts by mass, the curability will be saturated, so the production cost can be reduced by setting it to 10 parts by mass or less.
- the Martens hardness based on ISO 14577 of the protective layer is adjusted to 100 to 200 N / weight by adjusting the crosslinking density by adjusting the number of reactive functional groups and molecular weight of the ultraviolet or electron beam curable resin used for the protective layer. It is preferably in the range of mm 2.
- the crosslinking density by adjusting the number of reactive functional groups and molecular weight of the ultraviolet or electron beam curable resin used for the protective layer.
- it is preferably in the range of mm 2.
- the uppermost layer coating solution it is difficult to scratch the surface of the protective layer, thereby preventing a decrease in glossiness.
- it is excellent in folding resistance by setting it as 200 N / mm ⁇ 2 > or less.
- examples of the ultraviolet light source include 1 to 50 ultraviolet lamps, xenon lamps, tungsten lamps, and the like.
- ultraviolet rays having an intensity of about 40 to 240 W / cm, preferably about 60 to 180 W / cm can be irradiated.
- the absorbed dose of the irradiated electron beam is preferably in the range of about 10 to 200 kGy, more preferably about 20 to 100 kGy.
- the resin component By setting it to 10 kGy or more, the resin component can be sufficiently cured, and by setting it to 200 kGy or less, there is no possibility of color development or discoloration of the thermosensitive recording medium due to excessive electron beams.
- an electron beam irradiation method for example, a scanning method, a curtain beam method, a broad beam method, or the like can be adopted, and an acceleration voltage at the time of irradiation is preferably about 70 to 300 kV.
- the ultraviolet rays and the electron beam may be irradiated from either the recording surface or the back surface of the support, and the irradiation conditions may be appropriately selected according to the ultraviolet ray or the electron beam curable resin composition and the coating amount. From the viewpoint of obtaining higher glossiness, it is preferable to be cured by irradiation with an electron beam.
- an uppermost layer containing a water-based adhesive and a pigment having an average particle diameter of 100 nm or less is provided on the protective layer.
- aqueous adhesive contained in the uppermost layer examples include an aqueous adhesive contained in the heat-sensitive recording layer. These can be used individually by 1 type or in combination of 2 or more types.
- the total content of the water-based adhesive is preferably 20 to 70% by mass with respect to the total solid content of the uppermost layer. By setting it to 20% by mass or more, a uniform thin film excellent in film formability can be formed. By setting it to 70% by mass or less, the effect of suppressing sticking is excellent.
- any of water-soluble adhesives and water-dispersible adhesives can be used.
- water-soluble adhesives include starches, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, silicon-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol, and carboxy-modified.
- Polyvinyl alcohol diacetone modified polyvinyl alcohol, diisobutylene-maleic anhydride copolymer salt, styrene-maleic anhydride copolymer salt, ethylene-acrylic acid copolymer salt, styrene-acrylic acid copolymer salt, methyl vinyl ether
- maleic anhydride copolymer salts isopropylene-maleic anhydride copolymer salts
- polyacrylamides examples of the water-dispersible adhesive include vinyl acetate latex, styrene-butadiene latex, acrylic latex, urethane latex and the like.
- vinyl acetate latex, styrene-butadiene latex, acrylic are used because of improving the adhesion to the protective layer cured by irradiating the ultraviolet ray or electron beam curable resin composition with ultraviolet ray or electron beam.
- a water-dispersible adhesive such as a latex based on urethane or a urethane based latex is preferred.
- the water-based adhesive used for the uppermost layer preferably contains a water-based adhesive made of polyurethane ionomer.
- a water-based adhesive made of polyurethane ionomer is preferably 20 to 60% by mass and more preferably 30 to 50% by mass with respect to the total solid content of the uppermost layer.
- the adhesion between the uppermost layer and the protective layer can be improved, and the uppermost layer component can be prevented from peeling off and becoming a head wrinkle. Moreover, the effect which improves water resistance is also acquired. On the other hand, sticking can be effectively suppressed by setting it as 60 mass% or less.
- the aqueous adhesive comprising a polyurethane ionomer used in the present invention is different from an emulsion type in which a polyurethane resin is dispersed in water with a conventional emulsifier or the like, and is an emulsifier by an ionic urethane resin, that is, an ionic group of the polyurethane ionomer. It is a so-called colloidally dispersed aqueous urethane resin which is dissolved in water or dispersed into extremely fine particles without using any organic solvent.
- the uppermost layer in the present invention preferably contains a resin obtained from a polymer latex having a heterophasic particle structure containing a urethane resin component in at least one phase as an aqueous adhesive.
- the content of the aqueous adhesive is preferably 5 to 30% by mass and more preferably 5 to 20% by mass with respect to the total solid content of the uppermost layer. By setting it as 5 mass% or more, the adhesiveness of a top layer and a protective layer can be improved further. On the other hand, when the content is 30% by mass or less, the effect of suppressing sticking is excellent.
- Such a heterogeneous particle structure polymer latex is not particularly limited in its heterogeneous particle structure.
- Structural examples and preparation methods of heterogeneous particle structures are described in “Application of Synthetic Latex (Takaaki Sugimura, Ikuo Kataoka, Junichi Suzuki, Keiji Kasahara Publishing Co., Ltd., published by Kobunshi Publishing Co., Ltd. (1993)).
- Examples include a core-shell structure, a composite structure, a localized structure, a daruma-like structure, a raspberry-like structure, a multiparticulate composite structure, a makizuki-like structure, an IPN (interpenetrating network structure), etc.
- a polymer latex having a core-shell structure, a composite structure, a raspberry-like structure, or a multiparticulate composite structure is preferred.
- a polymer latex having a heterophasic particle structure containing a urethane resin component in at least one phase includes, for example, natural rubber, polybutadiene, styrene-butadiene polymer, acrylonitrile-butadiene polymer, and methyl methacrylate-butadiene as components other than urethane resin.
- Polymers, polyacrylonitrile, polyvinyl acetate, polyethyl acrylate, polybutyl acrylate, polymethyl methacrylate, polyvinyl chloride, and the like can be included.
- a styrene-butadiene polymer those containing a styrene-butadiene polymer, an acrylonitrile-butadiene polymer, and a methyl methacrylate-butadiene polymer are preferable.
- a latex obtained by polymerizing a styrene monomer and a butadiene monomer in an aqueous medium containing a polyurethane ionomer as a urethane resin component is more preferable.
- the content of the urethane resin component in the polymer latex having a heterophasic particle structure containing the urethane resin component in at least one phase is preferably 3 to 90% by mass, more preferably 20 to 80% by mass.
- polymer latex having a heterophasic particle structure containing a urethane resin component in at least one phase are commercially available as, for example, Pateracol (registered trademark) H2090, H2020A (manufactured by DIC Corporation), and are easily obtained. Can be used.
- the content of the resin obtained from the polymer latex having a heterophasic particle structure containing a urethane resin component in at least one phase is used in combination with 100 parts by mass of the aqueous adhesive made of polyurethane ionomer when used in combination with the aqueous adhesive made of polyurethane ionomer.
- About 10 to 60 parts by mass is preferable, and about 10 to 55 parts by mass is more preferable.
- the adhesiveness of a top layer and a protective layer can be improved further.
- the amount is 60 parts by mass or less, the effect of suppressing sticking is excellent.
- the present invention by containing a pigment having an average particle diameter of 100 nm or less, dust, foreign matter, particularly sebum stains when touched with bare hands are adsorbed on the surface of the heat-sensitive recording body without reducing glossiness.
- a pigment having an average particle diameter of 100 nm or less dust, foreign matter, particularly sebum stains when touched with bare hands are adsorbed on the surface of the heat-sensitive recording body without reducing glossiness.
- sebum stains and the like can be prevented from transferring to the thermal head surface during recording.
- the sebum dirt or the like can be adsorbed and easily scraped off from the surface of the thermal head.
- the surface of the protective layer is highly hydrophobic and the wetting tension is low, repelling is likely to occur in the uppermost thin film, and pigments with an average particle diameter of 100 nm or less are likely to be unevenly coated, resulting in excellent film formability. Since a uniform uppermost layer can be formed, it is possible to improve printing troubles such as print scratches and white streaks caused by accumulation of sebum stains on the surface of the thermal head.
- the pigment contained in the uppermost layer has an average particle size of 100 nm or less, preferably 80 nm or less, more preferably 50 nm or less. If it exceeds 100 nm, the high glossiness of the surface of the protective layer is impaired, the glossiness of the surface of the uppermost layer side is lowered, and the recording image quality may be impaired.
- the lower limit of the average particle diameter is not particularly limited, but is about 5 nm or more because it is available as an industrial material. If the particle diameter is further reduced to less than 5 nm, the stability of the particles is impaired, and the recording image quality may be impaired due to the formation of secondary aggregates.
- the average particle diameter of the pigment used in the uppermost layer is measured by, for example, a laser diffraction / scattering method (SALD2200 manufactured by Shimadzu Corporation, LB-500 manufactured by Horiba, Ltd., MT3300 manufactured by Nikkiso Co., Ltd.), centrifugal sedimentation method, Coulter counter It can be measured by a commonly used measuring device such as an electron microscope.
- SALD2200 manufactured by Shimadzu Corporation, LB-500 manufactured by Horiba, Ltd., MT3300 manufactured by Nikkiso Co., Ltd.
- centrifugal sedimentation method Coulter counter It can be measured by a commonly used measuring device such as an electron microscope.
- pigments include layered silicate compounds such as mica, hectorite and smectite, and inorganic pigment fine particles such as colloidal silica, alumina sol, zinc oxide and titanium oxide.
- layered silicate compounds and colloidal silica are preferable because they are excellent in the effect of adsorbing sebum stains and the like adhering to the surface of the heat-sensitive recording material and suppressing the accumulation of soot on the surface of the thermal head.
- synthetic hectorite is particularly preferable.
- the content of the pigment is preferably 20 to 70% by mass, and more preferably 20 to 60% by mass with respect to the total solid content of the uppermost layer. By making it 20% by mass or more, it is possible to exhibit even more excellent sebum dirt absorbing and scraping properties. On the other hand, by setting it to 70% by mass or less, the glossiness and the recording image quality can be further improved.
- the content of the pigment is preferably 45 to 180 parts by mass, and more preferably 45 to 160 parts by mass with respect to 100 parts by mass of the total amount of the aqueous adhesive in the uppermost layer.
- the content of the pigment is preferably 45 to 180 parts by mass, and more preferably 45 to 160 parts by mass with respect to 100 parts by mass of the total amount of the aqueous adhesive in the uppermost layer.
- the content of the pigment is preferably 50 to 200 parts by mass, preferably 60 to 190 parts by mass with respect to 100 parts by mass of the aqueous adhesive consisting of polyurethane ionomer when the uppermost layer contains an aqueous adhesive consisting of polyurethane ionomer. Part is more preferred.
- the content of the pigment is preferably 50 to 200 parts by mass, preferably 60 to 190 parts by mass with respect to 100 parts by mass of the aqueous adhesive consisting of polyurethane ionomer when the uppermost layer contains an aqueous adhesive consisting of polyurethane ionomer. Part is more preferred.
- it 50 parts by mass or more it is possible to exhibit even more excellent sebum dirt absorbing and scraping properties.
- by setting it to 200 parts by mass or less it is possible to improve glossiness and recording image quality, and to improve the adhesion between the uppermost layer and the protective layer.
- the uppermost layer was further prepared by mixing an alkyl phosphate ester salt, an alkali metal pyrophosphate salt, and a specific thickener as an additive other than the pigment and the water-based adhesive, for example, using water as a medium. It is preferable that the uppermost layer coating solution is formed by applying and drying on the protective layer.
- the thickener examples include at least one thickener selected from acrylic alkaline thickeners, polyethylene oxide, xanthan gum and sodium polyacrylate.
- the surface of the protective layer is highly hydrophobic and the wetting tension is low, a specific thickening agent is included in the uppermost layer coating liquid, so that the coating liquid can be repelled or flow unevenly during drying.
- a specific thickening agent is included in the uppermost layer coating liquid, so that the coating liquid can be repelled or flow unevenly during drying.
- it suppresses uneven drying and further contains an alkali metal pyrophosphate to suppress thickening of the coating liquid over time by a specific thickener and reduce coating unevenness.
- the recording image quality and glossiness are improved, and excellent recording runnability can be obtained by containing an alkyl phosphate ester salt and a pigment having an average particle diameter of 100 nm or less.
- the content of the alkyl phosphate ester salt such as stearyl phosphate potassium salt is 0.5 to 10% by mass, more preferably 0.5 to 8% by mass with respect to the total solid content of the uppermost layer. 5 mass% is still more preferable.
- the content is 0.5 to 0.5% by mass or more, the adhesiveness between the thermal head and the uppermost layer is reduced, and in particular, in an effect of suppressing the occurrence of print damage in a high humidity environment of, for example, 30 ° C. and 85% RH. Excellent.
- it by setting it as 10 mass% or less, it can suppress that the uppermost-layer coating liquid thickens with time, and can reduce coating unevenness.
- the solid content concentration even when preparing the coating solution for the top layer with a low viscosity, the viscosity rises quickly when the dryer is dried to control the fluidity of the coating solution, to suppress drying unevenness, and to reduce the minute printing unevenness of the recording area. Can be improved.
- the acrylic alkali thickening type thickener as such a thickening agent is mainly composed of a non-crosslinking type alkali-soluble emulsion or a cross-linking type alkali swellable emulsion as an acrylic polymer.
- Addition of alkali such as caustic soda causes dissolution and swelling, and the effect of increasing the viscosity of the coating liquid by the action of chemical bonds (hydrogen bonds) between the polymer and water molecules and the physical action of the polymer including water molecules.
- these acrylic thickeners are emulsion type, they have a relatively high solid content and exhibit a sufficient thickening effect with a small amount of addition, such as carboxymethylcellulose, methylcellulose, sodium alginate, etc. Compared with the normally used thickener, the degree of impairing water resistance is extremely low.
- Polyethylene oxide can effectively increase the viscosity of the coating liquid by setting the preferred viscosity average molecular weight to 100,000 or more, more preferably 500,000 or more. From the viewpoint of improving mixing in the coating liquid, the viscosity average molecular weight is preferably 5,000,000 or less.
- Xanthan gum is produced extracellularly by Xantomonas camphors, a fungus that produces heteropolysaccharides, by total culture of the medium containing fermentable carbohydrates, nitrogen sources and other suitable nutrient sources under various conditions It means gum and is described in US Pat. No. 4,320,612. As a specific example of xanthan gum, for example, it is marketed as Kelzan series manufactured by Sankisha Co., Ltd., and can be easily obtained and used.
- the content of such a thickener is preferably in the range of 0.1 to 3% by mass, preferably in the range of 0.1 to 2% by mass with respect to the total solid content of the uppermost layer when an acrylic alkaline thickener is used. Is more preferable.
- the single content is preferably in the range of 0.05 to 0.5% by mass with respect to the total solid content of the uppermost layer. The range of 0.05 to 0.4% by mass is more preferable.
- the content of the thickener used in combination with the main thickener is preferably adjusted to 20% by mass or less.
- the coating solution for the uppermost layer contains an alkali metal pyrophosphate such as sodium pyrophosphate, thereby improving the stability of the coating solution and suppressing the thickening of the coating solution over time. Can be reduced.
- an alkali metal pyrophosphate such as sodium pyrophosphate
- a layered silicate compound is used as the pigment of the uppermost layer, it is used for the preparation of the uppermost layer coating liquid in the state of a dispersion using water as a medium, so that excellent stability as a dispersant can be obtained. .
- the content of the alkali metal pyrophosphate is in the range of 3 to 20% by mass with respect to the pigment contained in the uppermost layer, and more preferably 5 to 15% by mass. By setting it as 3 mass% or more, thickening of a coating liquid with time can be suppressed and coating unevenness can be reduced. On the other hand, water resistance can be improved by setting it as 20 mass% or less.
- surfactants include dioctyl sulfosuccinic acid sodium salt, dodecylbenzene sulfonic acid sodium salt, lauryl alcohol sulfate sodium salt, fatty acid alkali metal salts such as sodium stearate, fluorine-based surfactants such as perfluoroalkylethylene oxide adducts, etc.
- waxes include carnauba wax, paraffin wax, and ester wax.
- the lubricants include alkyl phosphates such as potassium stearyl phosphate, fatty acid metal salts such as zinc stearate and calcium stearate, and polyethylene wax.
- alkyl phosphates such as potassium stearyl phosphate
- fatty acid metal salts such as zinc stearate and calcium stearate
- polyethylene wax By containing zinc stearate in a range of preferably about 1 to 20% by mass, more preferably about 5 to 10% by mass, based on the total solid content of the uppermost layer, the recording running property can be improved.
- an emulsified dispersion of zinc stearate having a small average particle diameter is preferable.
- Water resistance agents include glioxal, formalin, glycine, glycidyl ester, glycidyl ether, dimethylol urea, ketene dimer, dialdehyde starch, melamine resin, polyamide resin, polyamide-epichlorohydrin resin, ketone-aldehyde resin, borax, boric acid, Examples thereof include ammonium zirconium carbonate, epoxy compounds, hydrazine compounds, oxazoline group-containing compounds, and the like.
- top layer for example, water is used as a medium, and a top layer coating solution prepared by mixing a water-based adhesive, a pigment having an average particle diameter of 100 nm or less, and additives as necessary is applied and dried on the protective layer. Provided.
- the coating amount of the top layer coating liquid is not particularly limited, but the average thickness of the top layer after drying is preferably 0.02 to 0.4 ⁇ m, more preferably 0.05 to 0.35 ⁇ m, and It is applied so as to be equal to or larger than the average particle size of the pigment used. By setting it as 0.02 micrometer or more, a coating defect can be prevented and the much more excellent sebum dirt absorbing property can be exhibited. On the other hand, by using a thin film of 0.4 ⁇ m or less, interference fringes (rainbow unevenness) on the surface of the uppermost layer that appears strongly when larger than 0.4 ⁇ m can be suppressed, and the surface quality of the recording surface can be improved.
- the average thickness of the uppermost layer is determined by measuring the thickness from any five positions of the reflected electron composition image obtained by photographing the cross section of the thermosensitive recording body at a magnification of 1000 to 3000 using an electron microscope. The average value of three places excluding the value and the minimum value is obtained. More simply, it may be determined by dividing the solid content coating amount of the uppermost layer by the density after drying of the uppermost layer.
- the top layer coating solution is applied on the protective layer by application methods such as slot die coating, slide bead coating, curtain coating, air knife coating, blade coating, gravure coating, micro gravure coating, bar coating, rod coating, roll coating, etc. Is done.
- the micro gravure coating method is used from the viewpoint of suppressing the uneven swimming of the coating liquid and forming a uniform thin film having no coating defects such as repellency when the average thickness of the uppermost layer is in the range of 0.02 to 0.4 ⁇ m.
- a mode in which the coating is performed is preferable.
- Examples of the micro gravure coating method include the method described in JP-A-2-119777.
- the uppermost layer can be provided on the protective layer by coating and drying, so that the uppermost layer is formed by coating and drying on a substrate different from the support, and the uppermost layer is further formed on the support side.
- the productivity can be increased by a simple method without going through complicated steps such as transfer to the surface.
- the surface of the protective layer is subjected to treatment such as corona discharge, electron beam or ultraviolet irradiation, flame treatment, etc. It is preferable to set it as 50 mN / m or more. As a result, a uniform uppermost layer without coating defects can be effectively formed, and the recording image quality can be further improved. Also, modification by surface treatment is effective for improving the adhesion between the protective layer and the uppermost layer.
- the wetting tension is measured according to the test method of JIS K 6768-1999.
- the heat-sensitive recording material of the present invention has a back layer containing a pigment, an adhesive, an antistatic agent, etc. on the back of the support in order to improve the running performance of the recording or prevent sticking due to static electricity and damage to the thermal head.
- the back surface layer formed using the coating liquid can also be provided.
- various known techniques in the field of manufacturing a thermal recording material can be added as necessary.
- the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.
- “parts” and “%” represent “parts by mass” and “mass%”, respectively.
- the average particle size of the leuco dye and developer used in the examples and comparative examples was measured using a laser diffraction particle size distribution analyzer SALD2200 (manufactured by Shimadzu Corporation).
- SALD2200 laser diffraction particle size distribution analyzer
- the average particle diameter of the filler used for the protective layer measured the volume average particle diameter using the micro track particle size distribution measuring device MT3300 (made by Nikkiso Co., Ltd.).
- the average particle size of the pigment used in the uppermost layer was measured by using a dynamic light scattering type particle size distribution measuring device LB-500 (manufactured by Horiba Seisakusho).
- the Martens hardness was measured on the surface of the cured protective layer before forming the uppermost layer by using an ultra micro hardness tester (trade name: FisherScope HM2000, manufactured by Fisher Instruments).
- Example 1 Preparation of leuco dye dispersion (liquid A) 3-di (n-butyl) amino-6-methyl-7-anilinofluorane 20 parts, sulfone-modified polyvinyl alcohol (trade name: Goceran L-3266, Nippon Gosei Co., Ltd.) The composition consisting of 10 parts of a 10% aqueous solution and 20 parts of water was dispersed with a sand mill so that the volume average particle diameter was 1.0 ⁇ m to obtain a liquid A.
- intermediate layer coating solution 70 parts of 60% slurry of kaolin (trade name: UW-90, manufactured by Engelhard), acetoacetyl-modified polyvinyl alcohol (trade name: Gohsefamer (registered trademark) Z-200, Japan
- a composition consisting of 180 parts of a 10% aqueous solution of Synthetic Co., Ltd., 2 parts of a 10% aqueous solution of sodium dioctylsulfosuccinate and 150 parts of water was mixed to obtain a coating solution for an intermediate layer.
- neopentyl glycol hydroxypivalate ester diacrylate (trade name: KAYARAD MANDA, manufactured by Nippon Kayaku Co., Ltd.), caprolactone-modified dipentaerythritol hexaacrylate (trade name) : KAYARAD DPCA-60, manufactured by Nippon Kayaku Co., Ltd.), a cube having a 50% volume average particle diameter (D50) of 1.0 ⁇ m and a 90% volume average particle diameter (D90) of 2.0 ⁇ m
- D50 50% volume average particle diameter
- D90 90% volume average particle diameter
- top layer coating solution 270 parts of the above synthetic hectorite dispersion, aqueous adhesive made of polyurethane ionomer (trade name: Hydran (registered trademark) AP-40, solid content concentration 22.5%, manufactured by DIC) 25 parts, latex obtained by polymerizing styrene monomer and butadiene monomer in an aqueous medium containing polyurethane ionomer (trade name: Pateracol (registered trademark) H2020A, solid content concentration 41%, manufactured by DIC) 1.5 part, and stearin A composition comprising 2 parts of zinc acid (trade name: Hi-micron L-111, solid content concentration 20%, manufactured by Chukyo Yushi Co., Ltd.) was mixed to obtain a coating solution for the uppermost layer.
- aqueous adhesive made of polyurethane ionomer (trade name: Hydran (registered trademark) AP-40, solid content concentration 22.5%, manufactured by DIC) 25 parts
- thermo recording material The coating amount for the thermal recording layer and the intermediate layer coating solution on one side of a synthetic paper (trade name: YUPO FPG-80, manufactured by YUPO Corporation) as a support, respectively, was dried. There 6.0 g / m 2, sequentially applied and dried by a bar coating method so that 2.5 g / m 2, provided with a heat-sensitive recording layer and the intermediate layer, the intermediate layer surface treated supercalender on the intermediate layer
- the protective layer coating solution is applied by an offset gravure coating method so that the solid content coating amount is 1.5 g / m 2, and an electron with an acceleration voltage of 175 KV and an absorbed dose of 40 kGy by an electrocurtain type electron beam accelerator (manufactured by ESI).
- the surface of the protective layer was subjected to corona discharge treatment, and the wetting tension was set to 70 mN / m. Further, the uppermost layer was provided on the protective layer by a microgravure coating method so that the coating amount after drying of the uppermost layer coating solution was 0.15 g / m 2 to provide a thermal recording material.
- the average thickness of the protective layer was 1.5 ⁇ m, and the average thickness of the uppermost layer was 0.15 ⁇ m.
- the Martens hardness after providing the protective layer was 160 N / mm 2 .
- Example 2 Latex in which styrene monomer and butadiene monomer were polymerized in an aqueous medium containing 300 parts of a synthetic hectorite dispersion, 35 parts of an aqueous adhesive made of polyurethane ionomer, and an aqueous medium containing polyurethane ionomer in the preparation of the top layer coating liquid of Example 1.
- Heat sensitive in the same manner as in Example 1 except that 10 parts, 15 parts of zinc stearate, and 5 parts of stearyl phosphate potassium salt (trade name: Wopol 1800, solid concentration 35%, manufactured by Matsumoto Yushi Co., Ltd.) were used. A record was obtained.
- Example 3 Latex in which styrene monomer and butadiene monomer were polymerized in an aqueous medium containing 350 parts of a synthetic hectorite dispersion, 16 parts of an aqueous adhesive comprising a polyurethane ionomer, and an aqueous medium containing the polyurethane ionomer in the preparation of the top layer coating liquid of Example 1.
- a heat-sensitive recording material was obtained in the same manner as in Example 1 except that 1.5 parts and 3 parts of zinc stearate were used.
- Example 4 In the preparation of the top layer coating solution of Example 1, colloidal silica (trade name: Snowtex N, solid content concentration 20%, manufactured by Nissan Chemical Industries, volume average particle size of 15 nm) was used instead of 270 parts of the synthetic hectorite dispersion. A heat-sensitive recording material was obtained in the same manner as in Example 1 except that 25 parts and 100 parts of water were used. The average thickness of the uppermost layer was 0.15 ⁇ m.
- colloidal silica trade name: Snowtex N, solid content concentration 20%, manufactured by Nissan Chemical Industries, volume average particle size of 15 nm
- Example 5 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that in the production of the heat-sensitive recording material of Example 1, the coating amount after drying of the uppermost layer coating liquid was 0.3 g / m 2 . The average thickness of the uppermost layer was 0.3 ⁇ m.
- Example 6 In the preparation of the coating liquid for protective layer of Example 1, spherical silica having a 50% volume average particle diameter (D50) of 1.5 ⁇ m and a 90% volume average particle diameter (D90) of 2.5 ⁇ m instead of synthetic zeolite ( trade name: SO-E3, using Admatechs Co., Ltd.) 12 parts, and 3.5 g / m 2 in place of the solid coating amount of the protective layer coating solution 1.5 g / m 2, the surface of the protective layer A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the wetting tension was changed to 55 mN / m instead of 70 mN / m by corona discharge treatment. The average thickness of the protective layer was 3.5 ⁇ m. The Martens hardness after providing the protective layer was 165 N / mm 2 .
- D50 volume average particle diameter
- D90 90% volume average particle diameter
- thermosensitive recording material was obtained in the same manner as in Example 1 except that 100 parts of water was used instead of 270 parts of the synthetic hectorite dispersion in the preparation of the uppermost layer coating liquid of Example 1.
- Comparative Example 2 In the preparation of the uppermost layer coating liquid of Example 1, instead of 270 parts of the synthetic hectorite dispersion liquid, 12 parts of 40% slurry of calcined kaolin having a volume average particle size of 1.5 ⁇ m and 100 parts of water were used. Obtained a heat-sensitive recording material in the same manner as in Example 1.
- Comparative Example 3 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the surface of the protective layer was not subjected to corona discharge treatment and the uppermost layer was not provided in the production of the heat-sensitive recording material of Example 1.
- thermosensitive recording material thus obtained was evaluated as follows. The results are shown in Table 1.
- the gloss level (based on JIS P 8142-1993) of the unrecorded portion on the uppermost layer side surface of the thermal recording medium is incident angle 75. Measured at degrees and 20 degrees. Similarly, the glossiness of the surface of the cured protective layer before applying the uppermost layer was measured at an incident angle of 75 degrees.
- the thermal recording medium was subjected to halftone printing with a printer (trade name: UP-880, manufactured by Sony Corporation), and the image quality of the recording portion was evaluated as follows.
- Example 7 Preparation of leuco dye dispersion (liquid A) Composition comprising 20 parts of 3-di (n-butyl) amino-6-methyl-7-anilinofluorane, 10 parts of a 10% aqueous solution of polyvinyl alcohol, and 20 parts of water The product was dispersed with a sand mill so that the average particle size was 1.0 ⁇ m to obtain liquid A. The average particle size was measured by using a laser diffraction particle size distribution analyzer SALD2000 (manufactured by Shimadzu Corporation).
- SALD2000 laser diffraction particle size distribution analyzer
- liquid B A composition comprising 50 parts of 4-hydroxy-4'-isopropoxydiphenylsulfone, 20 parts of a 10% aqueous solution of polyvinyl alcohol, and 60 parts of water was mixed with a sand mill to obtain an average particle size. Liquid B was obtained by dispersing to 1.2 ⁇ m. The average particle size was measured by using a laser diffraction particle size distribution analyzer SALD2000 (manufactured by Shimadzu Corporation).
- coating liquid for protective layer As an electron beam curable resin, 60 parts of neopentyl glycol hydroxypivalic acid ester diacrylate (trade name: KAYARAD MANDA, manufactured by Nippon Kayaku Co., Ltd.), caprolactone A composition comprising 40 parts of modified dipentaerythritol hexaacrylate (trade name: KAYARAD DPCA-60, manufactured by Nippon Kayaku Co., Ltd.), a 50% volume average particle size (D50) of 1.0 ⁇ m, and a 90% volume average particle size (D90) 2.0 ⁇ m cubic synthetic zeolite (trade name: Shilton AMT-08L, manufactured by Mizusawa Chemical Co., Ltd.) 5 parts, 50% volume average particle diameter (D50) of 0.7 ⁇ m zinc stearate fine
- KAYARAD MANDA modified dipentaerythritol hexaacrylate
- D90 90% volume average particle size 2.0 ⁇ m cubic synthetic zeolite
- a layered silicate compound that is a synthetic hectorite (trade name: Laponite B, average particle size 40 nm, manufactured by Rockwood) 50 parts was added and stirred vigorously to prepare a 10% dispersion of a layered silicate compound.
- Aqueous polyurethane resin (aqueous adhesive composed of polyurethane ionomer) (trade name: Hydran AP-40, solid content concentration 22.5%, 200 parts by Dainippon Ink & Chemicals, Inc., 5 parts by styrene-butadiene latex (trade name: SMARTEX PA-9281, solid concentration 40%, manufactured by Nippon A & L), zinc stearate (trade name: Hymicron L) -111, solid content concentration 20%, manufactured by Chukyo Yushi Co., Ltd.) 25 parts, nonionic surfactant (trade name: Olphine E1010, manufactured by Nisshin Chemical Co., Ltd.) 10% 10 parts of aqueous solution, alkyl phosphate potassium salt (trade name: Wopol 1800, solid concentration 35%, manufactured by Matsumoto Yushi Co., Ltd.) 0.94 parts, acrylic alkali thickening type thickener (trade name: Somalex 440, solid A composition comprising 4.1 parts of a partial concentration of
- thermosensitive recording material On one side of synthetic paper (trade name: YUPO FPG-80, thickness 80 ⁇ m, manufactured by YUPO Corporation) as a support, the thermal recording layer coating solution and the intermediate layer coating solution are dried. after coating amount after each, 8.0 g / m 2, sequentially applied and dried by a bar coating method so that 3.0 g / m 2 to form a heat-sensitive recording layer and the intermediate layer were processed supercalender A protective layer coating solution is applied on the intermediate layer by an offset gravure coating method so that the coating amount is 3.5 g / m 2, and an electrocurtain type electron beam accelerator (manufactured by ESI) has an acceleration voltage of 175 kV and an absorbed dose of 35 kGy.
- synthetic paper trade name: YUPO FPG-80, thickness 80 ⁇ m, manufactured by YUPO Corporation
- the protective layer made of the electron beam curable resin composition was cured by irradiation with an electron beam. Furthermore, the uppermost layer coating liquid was applied and dried by a microgravure coating method so that the coating amount after drying was 0.15 g / m 2 on the protective layer to obtain a heat-sensitive recording material.
- Example 8 A thermosensitive recording material was obtained in the same manner as in Example 7 except that in the preparation of the uppermost layer coating solution of Example 7, the amount of the alkyl phosphate potassium salt was changed to 55.1 parts instead of 7.4 parts. It was.
- Example 9 A heat-sensitive recording material was obtained in the same manner as in Example 7 except that the amount of sodium pyrophosphate was changed to 1 part instead of 5 parts in the preparation of the uppermost layer coating solution of Example 7.
- Example 10 A thermosensitive recording material was obtained in the same manner as in Example 7 except that the amount of sodium pyrophosphate was changed to 12.5 parts instead of 5 parts in the preparation of the uppermost layer coating solution of Example 7.
- thermosensitive recording material thus obtained was evaluated as follows. The results are shown in Table 2.
- the glossiness at 75 degrees is preferably 90% or more, and more preferably 95% or more.
- the glossiness of 20 degrees is preferably 45% or more, more preferably 55% or more, and particularly preferably 65% or more from the viewpoint of improving the recording image quality closer to mirror gloss.
- thermosensitive recording medium is conditioned for 30 minutes in an environment of 30 ° C and 85% RH, and solid black with a built-in pattern of a thermal recording printer (trade name: UP-D897, manufactured by Sony Corporation) in an environment of 30 ° C and 85% RH.
- the printed stamp screen was visually observed, and the recording running property was visually determined as follows.
- X A print defect is strongly generated, which is a problem.
- the thermal recording medium is solid black printed with a built-in pattern of a printer (trade name: UP-D897, manufactured by Sony Corporation), and the printed screen is observed under a single fluorescent lamp that is easy to observe drying unevenness.
- the unevenness was visually determined as follows. A: There is no drying unevenness. ⁇ : Drying unevenness hardly occurs. (Triangle
- the thermal recording medium was solid black printed with the built-in pattern of the printer (trade name: UP-D897, manufactured by Sony Corporation), water was dripped onto the printed screen, and then immediately rubbed with a finger 100 times to visually check the water resistance of the top layer.
- Judged. A There is no change in the uppermost layer.
- ⁇ The uppermost layer swells and slightly whitens, but there is no practical problem.
- ⁇ The uppermost layer is partially dissolved and peeled off.
- X The uppermost layer is completely dissolved and disappears.
- Each top layer coating solution is stored at room temperature, and immediately after preparation, the viscosity of each coating solution is measured with a B-type viscometer (trade name: BM, manufactured by Tokyo Keiki Co., Ltd.), compared to immediately after preparation. The number of days required for the viscosity to increase by 5 mPa ⁇ s or more was evaluated.
- ⁇ Over 3 days and within 7 days.
- X Within 3 days.
- a coating liquid longer than 7 days has good stability, no coating unevenness, and no problem in production.
- Example 11 Preparation of leuco dye dispersion (liquid A) Composition comprising 20 parts of 3-di (n-butyl) amino-6-methyl-7-anilinofluorane, 10 parts of a 10% aqueous solution of polyvinyl alcohol, and 20 parts of water The product was dispersed with a sand mill so that the average particle size was 1.0 ⁇ m to obtain liquid A. The average particle size was measured by using a laser diffraction particle size distribution analyzer SALD2000 (manufactured by Shimadzu Corporation).
- SALD2000 laser diffraction particle size distribution analyzer
- coating liquid for protective layer As an electron beam curable resin, 60 parts of neopentyl glycol hydroxypivalic acid ester diacrylate (trade name: KAYARAD MANDA, manufactured by Nippon Kayaku Co., Ltd.), caprolactone A composition comprising 40 parts of modified dipentaerythritol hexaacrylate (trade name: KAYARAD DPCA-60, manufactured by Nippon Kayaku Co., Ltd.), a 50% volume average particle size (D50) of 1.0 ⁇ m, and a 90% volume average particle size (D90) 2.0 ⁇ m cubic synthetic zeolite (trade name: Shilton AMT-08L, manufactured by Mizusawa Chemical Co., Ltd.) 5 parts, 50% volume average particle diameter (D50) of 0.7 ⁇ m zinc stearate fine
- KAYARAD MANDA modified dipentaerythritol hexaacrylate
- D90 90% volume average particle size 2.0 ⁇ m cubic synthetic zeolite
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Abstract
Description
ISO 14577に基づくマルテンス硬さを100~200N/mm2の範囲にすることが好ましい。100N/mm2以上とすることにより、スティッキングを抑制し、皮脂汚れの掻取り性をより一層向上できる。また、最上層用塗液を塗布する際に、保護層表面に擦過傷を付き難くして、光沢度の低下を防ぐことができる。一方、200N/mm2以下とすることにより、耐折性に優れる。
・ロイコ染料分散液(A液)の調製
3-ジ(n-ブチル)アミノ-6-メチル-7-アニリノフルオラン20部、スルホン変性ポリビニルアルコール(商品名:ゴーセランL-3266、日本合成社製)の10%水溶液10部、及び水20部からなる組成物をサンドミルで体積平均粒子径が1.0μmとなるように分散してA液を得た。
4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン50部、スルホン変性ポリビニルアルコール(商品名:ゴーセランL-3266、日本合成社製)の10%水溶液20部、及び水60部からなる組成物をサンドミルで体積平均粒径が1.3μmとなるように分散してB液を得た。
A液70部、B液75部、無定形シリカ(商品名:ニップシールE-743、日本シリカ工業社製)の25%スラリー40部、完全鹸化ポリビニルアルコール(商品名:PVA105、クラレ社製)の10%水溶液50部、スチレン-ブタジエン系ラテックス(商品名:L-1571、固形分濃度48%、旭化成工業社製)30部、ステアリン酸アミド(商品名:ハイミクロンL-271、固形分濃度25%、中京油脂社製)20部、及び水30部からなる組成物を混合して感熱記録層用塗液を得た。
カオリン(商品名:UW-90、エンゲルハード社製)の60%スラリー70部、アセトアセチル変性ポリビニルアルコール(商品名:ゴーセファイマー(登録商標)Z-200、日本合成社製)の10%水溶液180部、ジオクチルスルホコハク酸ナトリウム塩の10%水溶液2部、及び水150部からなる組成物を混合して中間層用塗液を得た。
電子線硬化性樹脂として、ネオペンチルグリコールヒドロキシピバリン酸エステルジアクリレート(商品名:KAYARAD MANDA、日本化薬社製)60部、カプロラクトン変性ジペンタエリスリトールヘキサアクリレート(商品名:KAYARAD DPCA-60、日本化薬社製)40部からなる組成物と、50%体積平均粒子径(D50)が1.0μm、且つ90%体積平均粒子径(D90)が2.0μmの立方体形の合成ゼオライト(商品名:シルトンAMT-08L、水澤化学工業社製)5部、50%体積平均粒子径(D50)が0.7μmのステアリン酸亜鉛の微粉末1部を混合してスリーロールミルで分散し、保護層用塗液を得た。
水2600部中に、ピロリン酸ナトリウム4部を溶解し、合成ヘクトライト(商品名:ラポナイトB、ロックウッド社製、体積平均粒子径40nm)50部を添加、強撹拌して合成ヘクトライト分散液を得た。
上記の合成ヘクトライト分散液270部、ポリウレタンアイオノマーからなる水性接着剤(商品名:ハイドラン(登録商標)AP-40、固形分濃度22.5%、DIC社製)25部、ポリウレタンアイオノマーを含有する水性媒体中でスチレンモノマー及びブタジエンモノマーが重合されたラテックス(商品名:パテラコール(登録商標)H2020A、固形分濃度41%、DIC社製)1.5部、及びステアリン酸亜鉛(商品名:ハイミクロンL-111、固形分濃度20%、中京油脂社製)2部からなる組成物を混合して最上層用塗液を得た。
支持体としての合成紙(商品名:ユポFPG-80、ユポコーポレーション社製)の片面に、感熱記録層用塗液及び中間層用塗液を、それぞれ乾燥後の塗布量が6.0g/m2、2.5g/m2となるようにバー塗布方法により順次塗布及び乾燥して、感熱記録層及び中間層を設け、中間層面をスーパーカレンダー処理し、中間層上に保護層用塗液を固形分塗布量で1.5g/m2となるようにオフセットグラビアコーティング法により塗布し、エレクトロカーテン型電子線加速器(ESI社製)により加速電圧175KV、吸収線量40kGyの電子線を照射することにより硬化された保護層を設けた後、保護層の表面をコロナ放電処理し、濡れ張力を70mN/mとした。更に保護層上に、最上層用塗液を乾燥後の塗布量が0.15g/m2となるようにマイクログラビアコーティング法で塗布及び乾燥して最上層を設け、感熱記録体を得た。保護層の平均厚さは1.5μm、最上層の平均厚さは0.15μmであった。また、保護層を設けた後のマルテンス硬さは160N/mm2であった。
実施例1の最上層用塗液の調製において、合成ヘクトライト分散液300部、ポリウレタンアイオノマーからなる水性接着剤35部、ポリウレタンアイオノマーを含有する水性媒体中でスチレンモノマー及びブタジエンモノマーが重合されたラテックス10部、ステアリン酸亜鉛15部、更にステアリルリン酸エステルカリウム塩(商品名:ウーポール1800、固形分濃度35%、松本油脂社製)5部を使用した以外は、実施例1と同様にして感熱記録体を得た。
実施例1の最上層用塗液の調製において、合成ヘクトライト分散液350部、ポリウレタンアイオノマーからなる水性接着剤16部、ポリウレタンアイオノマーを含有する水性媒体中でスチレンモノマー及びブタジエンモノマーが重合されたラテックス1.5部、ステアリン酸亜鉛3部を使用した以外は、実施例1と同様にして感熱記録体を得た。
実施例1の最上層用塗液の調製において、合成ヘクトライト分散液270部に代えてコロイダルシリカ(商品名:スノーテックスN、固形分濃度20%、日産化学社製、体積平均粒子径15nm)25部、及び水100部を用いた以外は、実施例1と同様にして感熱記録体を得た。最上層の平均厚さは0.15μmであった。
実施例1の感熱記録体の作製において、最上層用塗液の乾燥後の塗布量を0.3g/m2とした以外は、実施例1と同様にして感熱記録体を得た。最上層の平均厚さは0.3μmであった。
実施例1の保護層用塗液の調製において、合成ゼオライトに代えて、50%体積平均粒子径(D50)が1.5μm、90%体積平均粒子径(D90)が2.5μmの球状シリカ(商品名:SO-E3、アドマテックス社製)12部を使用し、保護層用塗液の固形分塗布量を1.5g/m2に代えて3.5g/m2とし、保護層の表面の濡れ張力をコロナ放電処理により70mN/mに代えて55mN/mとした以外は、実施例1と同様にして感熱記録体を得た。保護層の平均厚さは3.5μmであった。また、保護層を設けた後のマルテンス硬さは165N/mm2であった。
実施例1の最上層用塗液の調製において、合成ヘクトライト分散液270部に代えて、水100部を使用した以外は、実施例1と同様にして感熱記録体を得た。
実施例1の最上層用塗液の調製において、合成ヘクトライト分散液270部に代えて、体積平均粒子径が1.5μmの焼成カオリンの40%スラリー12部、及び水100部を用いた以外は、実施例1と同様にして感熱記録体を得た。
実施例1の感熱記録体の作製において、保護層の表面をコロナ放電処理せず、最上層を設けなかった以外は、実施例1と同様にして感熱記録体を得た。
光沢度計(商品名:GM-26D、村上色彩技術研究所製)を用いて、感熱記録体の最上層側表面の未記録部の光沢度(JIS P 8142-1993に基づく)を入射角75度及び20度で測定した。また、同様にして最上層を塗布する前の硬化された保護層表面の光沢度を入射角75度で測定した。
感熱記録体の記録面に手汗・顔の皮脂汚れを付着させた後、プリンター(商品名:UP-880、ソニー社製)によりハーフトーン印画を行い、グレーベタ画面に皮脂が吸い取られた程度を下記のごとく評価した。皮脂汚れがグレーベタ画面にシミとなって濃く現れ、尾引きしないほど吸取り性が良好である。
◎:グレーベタ画面に皮脂汚れがシミとなって濃く現れ、尾引きしない。
○:グレーベタ画面に皮脂汚れがシミとなって濃く現れるが、尾引きする。
△:グレーベタ画面に皮脂汚れがシミとなって薄く現れ、尾引きする。
×:グレーベタ画面に皮脂汚れがシミとなって現れない。
感熱記録体の記録面に手汗・顔の皮脂汚れを付着させた後、プリンター(商品名:UP-880、ソニー社製)によりハーフトーン連続印画を行い、印字障害(白筋状の印画欠陥)の程度を下記のごとく評価した。
◎:印画開始から印字障害が発生しないか、数cm以内で印字障害が消える。
○:印画開始から数十cm程度で印字障害が消える。
△:印画開始から数m程度で印字障害が徐々に消える。
×:印画開始から数mを越えて印字障害が消えない。
感熱記録体をプリンター(商品名:UP-880、ソニー社製)によりハーフトーン印画を行い、記録部の画質を下記のごとく評価した。
◎:均一であり、白抜けがない。
○:白抜けがほとんどなく、実用上問題がない。
△:白抜けがあり、実用上問題である。
×:著しく不均一で問題がある。
感熱記録体をプリンター(商品名:UP-880、ソニー社製)により黒ベタ印画を行い、スティッキング(印画が跳んで横線が見られること)の程度を評価した。
◎:スティッキングがなく良好である。
○:スティッキングがほとんど見られず良好である。
△:スティッキングがところどころで見られ、実用上問題である。
×:スティッキングが激しく問題である。
・ロイコ染料分散液(A液)の調製
3-ジ(n-ブチル)アミノ-6-メチル-7-アニリノフルオラン20部、ポリビニルアルコールの10%水溶液10部、及び水20部からなる組成物をサンドミルで平均粒子径が1.0μmとなるように分散してA液を得た。平均粒子径はレーザー回折式粒度分布測定装置SALD2000(島津製作所社製)を用いて体積平均粒子径を測定した。
4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン50部、ポリビニルアルコールの10%水溶液20部、及び水60部からなる組成物をサンドミルで平均粒子径が1.2μmとなるように分散してB液を得た。平均粒子径はレーザー回折式粒度分布測定装置SALD2000(島津製作所社製)を用いて体積平均粒子径を測定した。
A液70部、B液75部、無定形シリカ(商品名:ニップシールE-743、日本シリカ社製)の25%スラリー40部、ポリビニルアルコールの10%水溶液50部、スチレン・ブタジエン系ラテックス(商品名:L-1537、固形分濃度50%、旭化成社製)30部、ステアリン酸アミド(商品名:ハイミクロンL-271、固形分濃度25%、中京油脂社製)20部、フッ素系界面活性剤(商品名:メガファックF-445、大日本インキ化学工業社製)の10%水溶液2部、及び水35部からなる組成物を混合して感熱記録層用塗液を得た。
カオリン(商品名:UW-90、エンゲルハード社製)の60%スラリー70部、ステアリン酸亜鉛(商品名:ハイドリンZ-8-36、固形分濃度36%、中京油脂社製)13部、アセトアセチル変性ポリビニルアルコール(商品名:ゴーセファイマーZ-200、日本合成化学工業社製)の10%水溶液180部、ジオクチルスルホコハク酸ナトリウム塩の10%水溶液2部、及び水120部からなる組成物を混合して中間層用塗液を得た。
電子線硬化性樹脂として、ネオペンチルグリコールヒドロキシピバリン酸エステルジアクリレート(商品名:KAYARAD MANDA、日本化薬社製)60部、カプロラクトン変性ジペンタエリスリトールヘキサアクリレート(商品名:KAYARAD DPCA-60、日本化薬社製)40部からなる組成物と、50%体積平均粒子径(D50)が1.0μm、且つ90%体積平均粒子径(D90)が2.0μmの立方体形の合成ゼオライト(商品名:シルトンAMT-08L、水澤化学工業社製)5部、50%体積平均粒子径(D50)が0.7μmのステアリン酸亜鉛の微粉末1部を混合してスリーロールミルで分散し、保護層用塗液を得た。
水446部中に、ピロリン酸ナトリウム塩5部を溶解し、合成ヘクトライトである層状珪酸塩化合物(商品名:ラポナイトB、平均粒子径40nm、ロックウッド社製)50部を添加、強撹拌して層状珪酸塩化合物10%分散液を調製し、水性ポリウレタン樹脂(ポリウレタンアイオノマーからなる水性接着剤)(商品名:ハイドランAP-40、固形分濃度22.5%、大日本インキ化学工業社製)200部、スチレン-ブタジエン系ラテックス(商品名:スマーテックスPA-9281、固形分濃度40%、日本A&L社製)5部、ステアリン酸亜鉛(商品名:ハイミクロンL-111、固形分濃度20%、中京油脂社製)25部、ノニオン系界面活性剤(商品名:オルフィンE1010、日信化学社製)の10%水溶液10部、アルキルリン酸エステルカリウム塩(商品名:ウーポール1800、固形分濃度35%、松本油脂社製)0.94部、アクリル系アルカリ増粘型増粘剤 (商品名:ソマレックス440、固形分濃度30%、ソマール社製)4.1部、及び水1350部からなる組成物を混合して最上層用塗液を得た。
支持体として合成紙(商品名:ユポFPG-80、厚さ80μm、ユポコーポレーション社製)の一方の面に、感熱記録層用塗液及び中間層用塗液を、乾燥後の塗布量がそれぞれ、8.0g/m2、3.0g/m2となるようにバー塗布方法で順次塗布及び乾燥して感熱記録層及び中間層を形成し、スーパーカレンダー処理した後、中間層上に保護層用塗液を塗布量が3.5g/m2となるようオフセットグラビア塗布方法で塗布し、エレクトロカーテン型電子線加速器(ESI社製)により加速電圧175kV、吸収線量35kGyの電子線を照射して電子線硬化性樹脂組成物からなる保護層を硬化させた。更に、保護層上に最上層用塗液を乾燥後の塗布量が0.15g/m2となるようマイクログラビア塗布方法で塗布及び乾燥して感熱記録体を得た。
実施例7の最上層用塗液の調製において、アルキルリン酸エステルカリウム塩の量を7.4部に代えて55.1部とした以外は、実施例7と同様にして感熱記録体を得た。
実施例7の最上層用塗液の調製において、ピロリン酸ナトリウムの量を5部に代えて1部とした以外は、実施例7と同様にして感熱記録体を得た。
実施例7の最上層用塗液の調製において、ピロリン酸ナトリウムの量を5部に代えて12.5部とした以外は、実施例7と同様にして感熱記録体を得た。
実施例1と同様の方法にて、最上層表面の未記録部のJIS P 8142-1993に基づく75度と20度の光沢度を光沢度計(商品名:GM-26D、村上色彩技術研究所)で測定した。75度の光沢度は、90%以上が好ましく、95%以上がより好ましい。20度の光沢度は、より鏡面光沢に近づけて記録画質を向上する観点から、45%以上が好ましく、55%以上がより好ましく、65%以上が特に好ましい。
実施例1と同様の方法にて、吸取り性を評価した。
実施例1と同様の方法にて、掻取り性を評価した。
実施例1と同様の方法にて、記録画質を測定し、評価した。
実施例1と同様の方法にて、スティッキングについて、評価した。
感熱記録体を30℃、85%RH環境下で30分間調湿し、同じく30℃、85%RH環境下で感熱記録プリンター(商品名:UP-D897、ソニー社製)の内蔵パターンでベタ黒印画した印画面を、目視で観察し、下記の如く記録走行性を目視判定した。
◎:印画傷が全くない。
○:印画傷がほとんど発生していない。
△:印画傷が発生しており、実用上問題である。
×:印画傷が強く発生しており、問題である。
感熱記録体をプリンター(商品名:UP-D897、ソニー社製)の内蔵パターンでベタ黒印画し、その印画面を乾燥ムラの観察し易い単一の蛍光灯下で観察し、印画面の乾燥ムラを下記の如く目視判定した。
◎:乾燥ムラがない。
○:乾燥ムラがほとんど発生していない。
△:乾燥ムラが発生しており、実用上問題である。
×:乾燥ムラが強く発生しており、問題である。
感熱記録体をプリンター(商品名:UP-D897、ソニー社製)の内蔵パターンでベタ黒印画し、その印画面に水を滴下した後、直ちに指で100回擦り、最上層の耐水性を目視判定した。
◎:最上層に変化がない。
○:最上層が膨潤してわずかに白化するが、実用上問題ない。
△:最上層が部分的に溶解して剥がれる。
×:最上層が完全に溶解して消失する。
それぞれの最上層用塗液を常温で保管し、調製直後から一日ごとに、B型粘度計(商品名:BM、東京計器社製)で各塗液の粘度を測定し、調製直後に比べ粘度が5mPa・s以上上昇するのに要する日数を評価した。
◎:10日を超える。
○:7日を超えて、10日以内。
△:3日を超えて、7日以内。
×:3日以内。
7日を超える塗液は、安定性が良好で塗布ムラの発生がなく、生産上問題ない。
・ロイコ染料分散液(A液)の調製
3-ジ(n-ブチル)アミノ-6-メチル-7-アニリノフルオラン20部、ポリビニルアルコールの10%水溶液10部、及び水20部からなる組成物をサンドミルで平均粒子径が1.0μmとなるように分散してA液を得た。平均粒子径はレーザー回折式粒度分布測定装置SALD2000(島津製作所社製)を用いて体積平均粒子径を測定した。
4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン50部、ポリビニルアルコールの10%水溶液20部、及び水60部からなる組成物をサンドミルで平均粒子径が1.2μmとなるように分散してB液を得た。平均粒子径はレーザー回折式粒度分布測定装置SALD2000(島津製作所社製)を用いて体積平均粒子径を測定した。
A液70部、B液75部、無定形シリカ(商品名:ニップシールE-743、日本シリカ社製)の25%スラリー40部、ポリビニルアルコールの10%水溶液50部、スチレン・ブタジエン系ラテックス(商品名:L-1537、固形分濃度50%、旭化成社製)30部、ステアリン酸アミド(商品名:ハイミクロンL-271、固形分濃度25%、中京油脂社製)20部、フッ素系界面活性剤(商品名:メガファックF-445、大日本インキ化学工業社製)の10%水溶液2部、及び水35部からなる組成物を混合して感熱記録層用塗液を得た。
カオリン(商品名:UW-90、エンゲルハード社製)の60%スラリー70部、ステアリン酸亜鉛(商品名:ハイドリンZ-8-36、固形分濃度36%、中京油脂社製)13部、アセトアセチル変性ポリビニルアルコール(商品名:ゴーセファイマーZ-200、日本合成化学工業社製)の10%水溶液180部、ジオクチルスルホコハク酸ナトリウム塩の10%水溶液2部、及び水120部からなる組成物を混合して中間層用塗液を得た。
電子線硬化性樹脂として、ネオペンチルグリコールヒドロキシピバリン酸エステルジアクリレート(商品名:KAYARAD MANDA、日本化薬社製)60部、カプロラクトン変性ジペンタエリスリトールヘキサアクリレート(商品名:KAYARAD DPCA-60、日本化薬社製)40部からなる組成物と、50%体積平均粒子径(D50)が1.0μm、且つ90%体積平均粒子径(D90)が2.0μmの立方体形の合成ゼオライト(商品名:シルトンAMT-08L、水澤化学工業社製)5部、50%体積平均粒子径(D50)が0.7μmのステアリン酸亜鉛の微粉末1部を混合してスリーロールミルで分散し、保護層用塗液を得た。
水446部中に、ピロリン酸ナトリウム塩5部を溶解し、合成ヘクトライトである層状珪酸塩化合物(商品名:ラポナイトB、平均粒子径40nm、ロックウッド社製)50部を添加、強撹拌して層状珪酸塩化合物10%分散液を調製し、水性ポリウレタン樹脂(商品名:ハイドランAP-40、固形分濃度22.5%、大日本インキ化学工業社製)200部、スチレン-ブタジエン系ラテックス(商品名:スマーテックスPA-9281、固形分濃度40%、日本A&L社製)5部、ステアリン酸亜鉛(商品名:ハイミクロンL-111、固形分濃度20%、中京油脂社製)25部、ノニオン系界面活性剤(商品名:オルフィンE1010、日信化学社製)の10%水溶液10部、アルキルリン酸エステルカリウム塩(商品名:ウーポール1800、固形分濃度35%、松本油脂社製)7.4部、アクリル系アルカリ増粘型増粘剤 (商品名:ソマレックス440、固形分濃度30%、ソマール社製)4.1部、及び水1350部からなる組成物を混合して最上層用塗液を得た。
支持体として合成紙(商品名:ユポFPG-80、厚さ80μm、ユポコーポレーション社製)の一方の面に、感熱記録層用塗液及び中間層用塗液を、乾燥後の塗布量がそれぞれ、8.0g/m2、3.0g/m2となるようにバー塗布方法で順次塗布及び乾燥して感熱記録層及び中間層を形成し、スーパーカレンダー処理した後、中間層上に保護層用塗液を塗布量が3.5g/m2となるようオフセットグラビア塗布方法で塗布し、エレクトロカーテン型電子線加速器(ESI社製)により加速電圧175kV、吸収線量35kGyの電子線を照射して電子線硬化性樹脂組成物からなる保護層を硬化させた。更に、保護層上に最上層用塗液を乾燥後の塗布量が0.15g/m2となるようマイクログラビア塗布方法で塗布及び乾燥して感熱記録体を得た。
実施例11の最上層用塗液の調製において、アルキルリン酸エステルカリウム塩の量を7.4部に代えて1.9部とした以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アルキルリン酸エステルカリウム塩の量を7.4部に代えて30.9部とした以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤の量を4.1部に代えて0.53部とした以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤の量を4.1部に代えて10.3部とした以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリエチレンオキサイド(商品名:PEO-3Z、粘度平均分子量600,000~1100,000、住友精化社製)の1%水溶液6.6部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリエチレンオキサイド(商品名:PEO-3Z、粘度平均分子量600,000~1100,000、住友精化社製)の1%水溶液11部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリエチレンオキサイド(商品名:PEO-3Z、粘度平均分子量600,000~1100,000、住友精化社製)の1%水溶液50部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、キサンタンガム(商品名:ケルザンASX-T、三晶社製)の1%水溶液6.6部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、キサンタンガム(商品名:ケルザンASX-T、三晶社製)の1%水溶液11部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、キサンタンガム(商品名:ケルザンASX-T、三晶社製)の1%水溶液50部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリアクリル酸ナトリウム(商品名:アクアリックFH-G、日本触媒社製)の1%水溶液6.6部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリアクリル酸ナトリウム(商品名:アクアリックFH-G、日本触媒社製)の1%水溶液11部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、アクリル系アルカリ増粘型増粘剤4.1部に代えて、ポリアクリル酸ナトリウム(商品名:アクアリックFH-G、日本触媒社製)の1%水溶液50部を用いた以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、ピロリン酸ナトリウムの量を5部に代えて2部とした以外は、実施例11と同様にして感熱記録体を得た。
実施例11の最上層用塗液の調製において、ピロリン酸ナトリウムの量を5部に代えて9部とした以外は、実施例11と同様にして感熱記録体を得た。
Claims (12)
- 支持体上にロイコ染料と顕色剤を含有する感熱記録層、水性接着剤を含有する中間層、並びに紫外線又は電子線硬化性樹脂組成物に紫外線又は電子線を照射することにより硬化された保護層を順次設けた感熱記録体において、更に前記保護層上に水性接着剤及び平均粒子径100nm以下の顔料を含有する最上層を備え、前記最上層側表面のJIS P 8142-1993に基づく75度の光沢度が90%以上、且つ20度の光沢度が35%以上であることを特徴とする感熱記録体。
- 前記最上層がポリウレタンアイオノマーからなる水性接着剤を含有する、請求項1に記載の感熱記録体。
- 前記顔料として層状珪酸塩化合物及びコロイダルシリカから選ばれる少なくとも1種を、前記最上層の全固形量に対して20~70質量%含有する、請求項1又は2に記載の感熱記録体。
- 前記最上層が水性接着剤として少なくとも一相にウレタン樹脂成分を含有する異相粒子構造のポリマーラテックスから得られる樹脂を含有する、請求項1~3のいずれか1項に記載の感熱記録体。
- 前記最上層の平均厚さが0.02~0.4μmであり、且つ前記顔料の平均粒子径以上である、請求項1~4のいずれか1項に記載の感熱記録体。
- 前記保護層が累積体積分布より求めた50%体積平均粒子径(D50)が2.0μm未満、且つ90%体積平均粒子径(D90)との比(D90/D50)が3.0以下であるフィラーを含有し、前記保護層の平均厚さが0.5~5μm、且つ前記フィラーの平均粒子径以上である、請求項1~5のいずれか1項に記載の感熱記録体。
- 前記保護層が合成ゼオライト及び球状シリカから選ばれる少なくとも1種のフィラーを含有する、請求項1~6のいずれか1項に記載の感熱記録体。
- 前記保護層の表面のJIS P 8142-1993に基づく75度の光沢度が90%以上、且つ濡れ張力が50mN/m以上である、請求項1~7のいずれか1項に記載の感熱記録体。
- 前記最上層がアルキルリン酸エステル塩;ピロリン酸アルカリ金属塩;並びにアクリル系アルカリ増粘型増粘剤、ポリエチレンオキサイド、キサンタンガム及びポリアクリル酸ナトリウムから選ばれる少なくとも1種の増粘剤を含有する最上層用塗液を用いて形成されたものであり、前記アルキルリン酸エステル塩の含有量が前記最上層の全固形量に対して0.5~10質量%であり、前記ピロリン酸アルカリ金属塩の含有量が前記顔料に対して3~20質量%である請求項1~8のいずれか1項に記載の感熱記録体。
- 前記アクリル系アルカリ増粘型増粘剤の含有量が、前記最上層の全固形量に対して0.1~3質量%である、請求項9に記載の感熱記録体。
- 前記ポリエチレンオキサイド、キサンタンガム及びポリアクリル酸ナトリウムから選ばれる少なくとも1種の含有量が、前記最上層の全固形量に対して0.05~0.5質量%である、請求項9又は10に記載の感熱記録体。
- 支持体上に、ロイコ染料と顕色剤を含有する感熱記録層、水性接着剤を含有する中間層、並びに紫外線又は電子線硬化性樹脂組成物に紫外線又は電子線を照射することにより硬化された保護層を順次設けた感熱記録体の製造方法において、更に前記保護層上に水性接着剤及び平均粒子径100nm以下の顔料を含有する最上層用塗液を塗布及び乾燥して最上層を設ける工程を含み、前記最上層側表面のJIS P 8142-1993に基づく75度の光沢度が90%以上、且つ20度の光沢度が35%以上である、請求項1~11のいずれか1項に記載の感熱記録体の製造方法。
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EP10748616.9A EP2404764B1 (en) | 2009-03-02 | 2010-02-16 | Heat-sensitive recording material and method for producing same |
CN201080010473.XA CN102341248B (zh) | 2009-03-02 | 2010-02-16 | 热敏记录材料及其制造方法 |
BRPI1012309-1A BRPI1012309B1 (pt) | 2009-03-02 | 2010-02-16 | Material de gravação sensível ao calor e método para a produção do mesmo |
US13/254,045 US8513160B2 (en) | 2009-03-02 | 2010-02-16 | Heat-sensitive recording material and method for producing same |
JP2011502706A JP5218638B2 (ja) | 2009-03-02 | 2010-02-16 | 感熱記録体及びその製造方法 |
KR1020117022966A KR101679193B1 (ko) | 2009-03-02 | 2010-02-16 | 감열 기록체 및 그 제조 방법 |
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JP (1) | JP5218638B2 (ja) |
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Cited By (8)
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JP2013173357A (ja) * | 2012-01-25 | 2013-09-05 | Mitsubishi Paper Mills Ltd | 可逆性感熱記録材料 |
JP2014180772A (ja) * | 2013-03-18 | 2014-09-29 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2014180773A (ja) * | 2013-03-18 | 2014-09-29 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2014188725A (ja) * | 2013-03-26 | 2014-10-06 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2015161899A (ja) * | 2014-02-28 | 2015-09-07 | ソマール株式会社 | ハードコート膜用コーティング組成物及びハードコート膜 |
JP2016093950A (ja) * | 2014-11-14 | 2016-05-26 | 大阪シーリング印刷株式会社 | 感熱記録体 |
JP2017165102A (ja) * | 2016-03-17 | 2017-09-21 | 株式会社リコー | キレート剤を含む感熱性記録材料 |
JP2020059283A (ja) * | 2019-12-12 | 2020-04-16 | 大阪シーリング印刷株式会社 | 帯封用感熱記録体 |
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DE102013002297A1 (de) * | 2013-02-08 | 2014-08-14 | Papierfabrik August Koehler Se | Wärmeempfindliches Aufzeichnungsmaterial |
JP6417674B2 (ja) * | 2013-03-07 | 2018-11-07 | 株式会社リコー | 感熱記録材料 |
JP5477995B1 (ja) | 2013-03-12 | 2014-04-23 | サカタインクス株式会社 | 活性エネルギー線硬化型オフセット印刷インキ組成物 |
CN110903716A (zh) * | 2019-11-29 | 2020-03-24 | 广东简彩纸业科技有限公司 | 三防热敏纸及其制造工艺 |
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- 2010-02-16 US US13/254,045 patent/US8513160B2/en not_active Expired - Fee Related
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JP2013173357A (ja) * | 2012-01-25 | 2013-09-05 | Mitsubishi Paper Mills Ltd | 可逆性感熱記録材料 |
JP2014180772A (ja) * | 2013-03-18 | 2014-09-29 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2014180773A (ja) * | 2013-03-18 | 2014-09-29 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2014188725A (ja) * | 2013-03-26 | 2014-10-06 | Dic Corp | 感熱記録媒体の保護層形成用コーティング剤及び感熱記録媒体 |
JP2015161899A (ja) * | 2014-02-28 | 2015-09-07 | ソマール株式会社 | ハードコート膜用コーティング組成物及びハードコート膜 |
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JP2017165102A (ja) * | 2016-03-17 | 2017-09-21 | 株式会社リコー | キレート剤を含む感熱性記録材料 |
JP2020059283A (ja) * | 2019-12-12 | 2020-04-16 | 大阪シーリング印刷株式会社 | 帯封用感熱記録体 |
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JPWO2010101020A1 (ja) | 2012-09-06 |
KR101679193B1 (ko) | 2016-11-24 |
BRPI1012309A2 (pt) | 2016-03-15 |
EP2404764A4 (en) | 2012-08-08 |
EP2404764A1 (en) | 2012-01-11 |
EP2404764B1 (en) | 2016-04-20 |
US20110318511A1 (en) | 2011-12-29 |
JP5218638B2 (ja) | 2013-06-26 |
US8513160B2 (en) | 2013-08-20 |
BRPI1012309B1 (pt) | 2019-09-24 |
KR20110128906A (ko) | 2011-11-30 |
CN102341248B (zh) | 2014-01-29 |
CN102341248A (zh) | 2012-02-01 |
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