WO2010140662A1 - 感熱記録体 - Google Patents
感熱記録体 Download PDFInfo
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- WO2010140662A1 WO2010140662A1 PCT/JP2010/059462 JP2010059462W WO2010140662A1 WO 2010140662 A1 WO2010140662 A1 WO 2010140662A1 JP 2010059462 W JP2010059462 W JP 2010059462W WO 2010140662 A1 WO2010140662 A1 WO 2010140662A1
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- 229960004889 salicylic acid Drugs 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- MLVWCBYTEFCFSG-UHFFFAOYSA-L zinc;dithiocyanate Chemical compound [Zn+2].[S-]C#N.[S-]C#N MLVWCBYTEFCFSG-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
-
- 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
- B41M5/41—Base layers supports or substrates
-
- 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
- B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
-
- 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]
-
- 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
Definitions
- the present invention relates to a heat-sensitive recording material that is excellent in print back-through when the back surface of the heat-sensitive recording material is printed, has excellent print quality on the heat-sensitive recording surface, in particular, barcode readability, and good reprintability.
- the heat-sensitive recording material is usually a colorless or light-colored electron-donating leuco dye and an electron-accepting developer such as a phenolic compound, each of which is ground and dispersed into fine particles, and then mixed together to form a binder, a filler,
- a coating solution obtained by adding a sensitivity improver, lubricant and other auxiliary agents is applied to a support such as paper, synthetic paper, film, plastic, etc., thermal head, hot stamp, thermal pen, Color is generated by an instantaneous chemical reaction by heating with laser light or the like, and a recorded image is obtained.
- the thermal recording medium is widely used as a recording medium such as a facsimile, a computer terminal printer, an automatic ticket vending machine, a measurement recorder, a receipt for a supermarket or a convenience store, and when used as a recording medium for a receipt, Opportunities to print advertisements on the reverse side are increasing, and in addition to the traditionally required color sensitivity and image quality for thermal recording media, general printing suitability (prevention of print back-through prevention, fleshing property, printing workability) Etc.) is required.
- Patent Document 2 mechanical pulp is used as a raw material for newspapers and magazines, but it is generally known that the use of mechanical pulp makes the paper bulky (Patent Document 2, etc.).
- Patent Document 3 in a thermal recording material having ink jet recording suitability on the back surface, by providing two undercoat layers between the support and the thermal recording layer, the ink jet ink is applied to the thermal recording surface when ink jet recording is performed. A method for suppressing the influence is disclosed (Patent Document 3).
- the present invention is excellent in image quality printed on the heat-sensitive recording surface, in particular, barcode readability, print density and reprintability even when printed on the back surface of the heat-sensitive recording material (opposite surface of the heat-sensitive recording layer).
- An object of the present invention is to provide a heat-sensitive recording material having a good heat resistance.
- thermosensitive recording medium provided with a thermosensitive recording layer containing a colorless or light-colored electron-donating leuco dye and an electron-accepting developer on the support.
- a thermosensitive recording medium provided with a thermosensitive recording layer containing a colorless or light-colored electron-donating leuco dye and an electron-accepting developer on the support.
- the present invention is a heat-sensitive recording material provided with a heat-sensitive recording layer comprising a colorless or light-colored electron-donating leuco dye and an electron-accepting developer on a support, and the support is made of mechanical pulp. Drip water absorption on the surface of the support on which the heat-sensitive recording layer is provided (except that the amount of water dropped is 0.001 ml, J. TAPPI No. 32-2 : According to the drip water absorption specified in 2000)).
- the quality of the image printed on the heat-sensitive recording surface in particular, the barcode readability is excellent (that is, print back-through is not caused).
- a thermal recording material having good print density and reprintability.
- the sheet containing the bulking agent that is hydrophilic has high opacity due to the increase in bulk, but the inking property to the ink that is hydrophobic is insufficient, There is a problem that ink easily penetrates into the opposite surface when printing (that is, print back-through) occurs.
- the mechanical pulp constituting the support refers to pulp obtained by physically crushing wood, and includes pulp that has been treated with chemicals or heat before crushing.
- the mechanical pulp include ground pulp (GP), refiner ground pulp (RGP), semi-chemical pulp (SCP), chemi-ground pulp (CGP), and thermomechanical pulp (TMP). If it is based on, it will not be limited to these, It can use individually or in combination of 2 or more types.
- thermomechanical pulp (TMP) has a higher specific scattering coefficient than other mechanical pulps and can provide high opacity, so that it is preferably used as a support for the heat-sensitive recording material of the present invention.
- this mechanical pulp and chemical pulp softwood bleached kraft pulp (NBKP), unbleached kraft pulp (NUKP), hardwood bleached kraft pulp (LBKP), unbleached kraft pulp (LUKP)), non-wood pulp Or the like can be appropriately blended depending on the required quality of the support.
- Waste paper pulp may be used for the support of the present invention.
- Waste paper pulp refers to pulp obtained by using waste paper as a raw material and removing ink contained in the waste paper in a deinking process.
- inks contained in waste paper include printing inks (edited by the Japan Printing Society, “Printing Engineering Handbook”, Gihodo, p.606, 1983), non-impact printing inks (“latest and special function inks”, CMC, p1, 1990). ) And non-heated osmotic drying offset inks used mainly in newspapers and paper-based magazines (Akiyuki Goto, Journal of Japan Printing Society, 38 (5), 7, (2001), etc.).
- Used paper includes used paper containing newspaper, flyers, magazines, cardboard and other mechanical pulp as the main raw material pulp, coated paper magazines, heat / pressure sensitive paper, imitation / color-quality paper, copy paper, computer output paper It is largely divided into used paper containing chemical pulp as the main raw material pulp.
- Mechanical pulp and chemical pulp contained in waste paper retain their properties. As described above, the mechanical pulp contained in the waste paper is bulky, and the sheet containing the waste paper containing the mechanical pulp has high opacity.
- Non-wood pulp includes bagasse pulp and straw pulp.
- the blending ratio of the mechanical pulp with respect to the total pulp of the support is 5% by weight or more, preferably in the range of 5 to 95% by weight, more preferably 10 to 50% by weight, still more preferably 10 to 25% by weight. is there. If the blending ratio of the mechanical pulp is less than 5% by weight with respect to the whole pulp of the support, it becomes difficult to obtain sufficient opacity, and the effect of preventing the ink see-through cannot be expected. On the other hand, when the blending ratio of the mechanical pulp is more than 25% by weight, the effect of preventing ink back-through is improved, but the smoothness of the support surface tends to decrease.
- the uniformity of the coated surface when the thermosensitive recording layer is coated on the support is lowered, and the fineness of the printed image is lowered, so that the improvement effect of the barcode readability tends to be saturated.
- the fineness of the printed image is greatly reduced and the print density and reprintability are lowered, and the support is accompanied by a decrease in entanglement (bonding between fibers) of pulp fibers. Since the strength of the ink is reduced, problems such as paper peeling that causes the support surface layer to peel off may occur due to tackiness (adhesiveness) of the ink during printing.
- this mechanical pulp includes mechanical pulp contained in the used paper pulp, and the blending ratio of the mechanical pulp in the used paper pulp is measured according to JIS P8120.
- the mixing ratio of the waste paper pulp to the whole pulp of the support is preferably in the range of 5 to 95% by weight, more preferably 5 to 80% by weight for the purpose of optimizing the balance between the effect of preventing ink back-through and the fineness of the printed image. %, More preferably 5 to 60% by weight.
- a filler may be added to the support.
- known fillers generally used in the past specific examples include inorganic fillers such as calcium carbonate, kaolin, clay, white carbon, titanium oxide, styrene-methacrylic copolymer resin, urea-formalin resin. And organic fillers such as polystyrene resin.
- the addition amount of the filler is not particularly limited, but it is preferable to adjust the addition amount so that the ash content of the support is 2 to 20%. If the ash content of the support exceeds 20%, the entanglement of the pulp fibers is hindered, so that sufficient strength may not be obtained.
- the ash content of the support is measured according to JIS P8251.
- the drip water absorption on the surface on which the heat-sensitive recording layer is provided is 50 seconds or more.
- This drip water absorbency is the same as that of J. Pulp and Paper Technology, except that the amount of dripped water is 1 ⁇ l (0.001 ml).
- TAPPI No. Measurement is performed according to 32-2: 2000 (paper—water absorption test method—part 2: dropping method). That is, when a test specimen (paper) is stretched horizontally and 1 ⁇ l (0.001 ml) of distilled water is dropped on the measurement surface (ie, the surface on which the heat-sensitive recording layer is provided), the water droplets are absorbed by visual observation. Measure the time to complete.
- the size of the test specimen may be any size as long as this measurement is possible. For example, a circular test piece having a diameter of at least about 40 mm may be used.
- the drip water absorption is expressed in time (seconds). The higher the drip water absorption, the lower the water absorption, and the lower the drip water absorption, the higher the water absorption.
- the drip water absorption on the surface of the support on which the heat-sensitive recording layer is provided is 50 seconds or more, thereby suppressing the sinking of the coating liquid when the heat-sensitive recording layer is coated on the support, and the effectiveness of the coating layer Since the layer thickness is increased and a uniform coated surface is obtained, the fineness of the printed image is improved, and the barcode readability, print density, and reprintability are improved.
- the drip water absorption is preferably 80 seconds or more, and more preferably 100 seconds or more.
- the barcode reading property, printing density, and reprinting property are good.
- the coating liquid sinks greatly when the heat-sensitive recording layer is applied onto the support, and sufficient barcode readability is obtained. Printing density and reprintability cannot be obtained.
- the drip water absorption is preferably 300 seconds or less, more preferably 200 seconds or less.
- the drip water absorption on the surface of the support on which the thermosensitive recording layer is provided is adjusted by treating the support with a sizing agent.
- the sizing agent may be internally added in the paper making process of the support, or may be applied after the paper making (external addition).
- the sizing agent is preferably applied (external addition) after papermaking.
- the desired drip water absorption can be obtained by appropriately selecting and adjusting the type, amount of use, and addition method of such a sizing agent according to the pulp constituting the support.
- the internal addition is a method in which a sizing agent is added to the pulp slurry at a so-called wet end, and the sizing agent is incorporated into the support at the same time as the paper making, and the external addition is a blade coater after paper making of the support.
- a sizing agent is coated on the surface of a support using a coating machine represented by a gate roll coater, a size press coater, a rod metering size press and the like.
- sizing agent for internal addition in the case of acidic papermaking, reinforced rosin sizing agent, emulsion sizing agent, synthetic sizing agent, etc., in the case of neutral papermaking, alkyl ketene dimer (AKD), Alkenyl succinic anhydride (ASA) and the like are used.
- sizing agents for external addition include cationic polymers such as styrene-maleic acid copolymer resins and styrene-acrylic acid copolymer resins, anionic polymers, and styrene polymers.
- Cationic polymers such as isocyanate polymers, saponified alkyd resins such as rosin, tall oil and phthalic acid, anionic low molecular compounds such as saponified petroleum resin and rosin, ⁇ -olefin-maleic acid copolymer resin Acrylic ester-acrylic acid copolymer resin, alkyl ketene dimer (AKD), etc., but styrene-acrylic acid copolymer resin that easily interacts with carboxyl groups in cellulose under neutral papermaking. Cationic polymers and alkyl ketene dimers (AKD) are preferred, especially styrene-actene. Cationic polymer Le acid copolymer resin is more preferable.
- the support becomes bulky and voids in the support increase, so that the drip water absorption tends to decrease.
- the drip water absorption of the support tends to decrease due to the influence of a surfactant contained in the waste paper pulp. Even in such a case, a desired drip water absorption can be obtained by appropriately selecting and adjusting the type, amount of use, and addition method of the sizing agent.
- the heat-sensitive recording layer is removed.
- the drip water absorption of the surface to be provided is the same as that measured on the opposite surface of the thermal recording medium.
- the paper making method of the support is not particularly limited, and a long net machine including a top wire, a circular net machine, a combination machine of both, a Yankee dryer machine, and the like can be used.
- the papermaking method can be appropriately selected from acidic papermaking, neutral papermaking, and alkaline papermaking, and is not particularly limited.
- the support may be appropriately mixed with chemicals usually used in the paper making process, for example, various auxiliary agents such as a paper strength enhancer, an antifoaming agent and a colorant.
- the sizing agent When the sizing agent is added internally, the addition amount may be set so as to give a desired drip water absorbency, but is preferably 0.1 to 1% by weight with respect to the weight of pulp in terms of solid content, more preferably 0.8%. 05 to 0.5% by weight.
- the sizing agent used for the external addition described above is used.
- the support is impregnated or coated with a coating solution that may further contain a water-soluble polymer substance, a pigment, or the like that increases the surface strength.
- water-soluble polymer substances that increase the surface strength include starch, enzyme-modified starch, thermochemically-modified starch, oxidized starch, esterified starch, etherified starch (for example, hydroxyethylated starch), cationized starch and the like.
- polyvinyl alcohol fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxyl modified polyvinyl alcohol, silanol modified polyvinyl alcohol, cation modified polyvinyl alcohol, polyvinyl alcohol such as terminal alkyl modified polyvinyl alcohol, polyacrylamide, cationic poly Polyacrylamides such as acrylamide, anionic polyacrylamide and amphoteric polyacrylamide, styrene / butadiene copolymer, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, poly Fluoride, polyvinylidene chloride, polyacrylic acid esters. These are used individually or in mixture of 2 or more types.
- auxiliary agents such as a dispersant, a plasticizer, a pH adjuster, an antifoaming agent, a water retention agent, an antiseptic, an adhesive, a coloring dye, and an ultraviolet ray inhibitor may be appropriately blended in the coating liquid as necessary. Good.
- the solid content concentration of the coating liquid is appropriately adjusted depending on the composition, coating apparatus, etc., but is usually about 5 to 15% by weight.
- the coating amount in the case of externally adding a sizing agent may be an amount that gives a desired drip water absorbency, but is preferably used when a coating apparatus capable of one-side coating such as a blade coater is used.
- the coating is evenly applied on both sides of the support, so that the surface of the support on which the thermosensitive recording layer is provided is coated.
- the amount of work is half of the amount of coating that combines both sides.
- the basis weight of the support of the heat-sensitive recording material is preferably 30 to 100 g / m 2 , more preferably 40 to 80 g / m 2 , and still more preferably 40 to 50 g / m 2 . In this case, even when printing is performed on the back surface of the heat-sensitive recording material, the effects of the present invention, such as excellent bar code reading performance, are exhibited to the maximum. If the basis weight of the support is less than 30 g / m 2 , there is a possibility that sufficient strength as a support for the heat-sensitive recording material cannot be obtained.
- the basis weight of the support exceeds 100 g / m 2 , it becomes difficult to obtain smoothness when the surface of the coating layer is treated with a calendar or the like, and there is a tendency that printing density and reprintability are lowered.
- the basis weight of the support is measured according to JIS P8124.
- an undercoat layer may be provided between the support and the heat-sensitive recording layer.
- This undercoat layer mainly comprises a binder and a pigment.
- the binder a generally used water-soluble polymer or hydrophobic polymer emulsion or the like can be appropriately used.
- cellulose derivatives such as polyvinyl alcohol, polyvinyl acetal, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, starch and its derivatives, polyacrylic acid soda, polyvinyl pyrrolidone, acrylic acid amide / acrylic acid ester copolymer, acrylic acid Water-soluble polymers such as amide / acrylic acid ester / methacrylic acid copolymer, styrene / maleic anhydride copolymer alkali salt, isobutylene / maleic anhydride copolymer alkali salt, polyacrylamide, sodium alginate, gelatin, casein, Polyvinyl acetate, polyurethane, styrene / butadiene copolymer, polyacrylic acid, polyacrylate ester, vinyl chloride / vinyl acetate copolymer, polybutyl methacrylate, ethylene / acetic acid Cycloalkenyl copolymer, can be used
- pigments known pigments generally used conventionally, specific examples include inorganic pigments such as calcium carbonate, silica, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, calcined kaolin, clay, talc, etc. Can be used. These pigments may be used alone or in combination of two or more.
- the pigment in the undercoat layer is usually 50 to 95% by weight, preferably 70 to 90% by weight, based on the total solid content.
- Various additives such as a dispersant, a plasticizer, a pH adjuster, an antifoaming agent, a water retention agent, an antiseptic, a coloring dye, and an ultraviolet ray inhibitor may be appropriately blended in the undercoat layer coating liquid as necessary. Good.
- the coating amount after drying of the undercoat layer is preferably 15 g / m 2 or less, more preferably 1 to 15 g / m 2 , still more preferably 3 to 10 g / m 2 .
- the support of the heat-sensitive recording material of the present invention is designed so that the drip water absorption on the surface on which the heat-sensitive recording layer is provided is 50 seconds or more. Even in the coating solution for the undercoat layer, Similarly, there is an effect of suppressing sinking of the coating liquid into the support. Therefore, even if the coating amount of the undercoat layer after drying is small, the effective layer thickness of the undercoat layer is large and a uniform coated surface can be obtained. By applying the coating solution for the heat-sensitive recording layer on this coated surface, sinking of the coating solution for the heat-sensitive recording layer is suppressed compared to the case where no undercoat layer is provided, and the effective layer thickness of the heat-sensitive recording layer is reduced. A large and highly uniform coated surface can be obtained.
- the quality of the image printed on the heat-sensitive recording surface that is, barcode readability, print density, and reprintability are particularly good.
- the undercoat layer has an effect of suppressing the penetration of ink into the heat-sensitive recording surface.
- the undercoat layer is thickened or has a barrier property that prevents the ink from permeating. There is no need to let it. Therefore, in the heat-sensitive recording material of the present invention, the coating amount after drying of the undercoat layer is relatively small.
- the surface opposite to the surface on which the heat-sensitive recording layer of the heat-sensitive recording material of the present invention is provided may be the same as the surface on which the heat-sensitive recording layer is provided. May be applied.
- the heat-sensitive recording layer of the present invention contains an electron-donating leuco dye and an electron-accepting developer, and may contain a sensitizer, a binder, a crosslinking agent, a stabilizer, a pigment, a lubricant, and the like as necessary.
- various materials used for the heat-sensitive recording layer of the present invention will be exemplified, but these materials can also be used for each coating layer provided as necessary including the heat-sensitive recording layer.
- the binder used in the present invention includes fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, acetoacetylated polyvinyl alcohol, carboxy modified polyvinyl alcohol, amide modified polyvinyl alcohol, sulfonic acid modified polyvinyl alcohol, butyral modified polyvinyl alcohol, and olefin modified.
- These polymer substances are used by dissolving them in solvents such as water, alcohol, ketones, esters, hydrocarbons, etc., and are used in the state of being emulsified or pasted in water or other media to achieve the required quality. It can also be used in combination.
- crosslinking agent used in the present invention examples include glyoxal, methylol melamine, melamine formaldehyde resin, melamine urea resin, polyamine epichlorohydrin resin, polyamide epichlorohydrin resin, potassium persulfate, ammonium persulfate, sodium persulfate, chloride chloride
- examples include ferric iron, magnesium chloride, borax, boric acid, alum, ammonium chloride and the like.
- the pigment used in the present invention include inorganic pigments such as silica, calcium carbonate, kaolin, calcined kaolin, diatomaceous earth, talc, titanium oxide, and aluminum hydroxide.
- the lubricant used in the present invention include fatty acid metal salts such as zinc stearate and calcium stearate, waxes, and silicone resins.
- 4,4′-butylidene (6-tert-butyl-3-methylphenol) is used as an image stabilizer exhibiting the oil resistance effect of a recorded image within a range not inhibiting the desired effect on the above problems.
- 2,2′-di-t-butyl-5,5′-dimethyl-4,4′-sulfonyldiphenol 1,1,3-tris (2-methyl-4-hydroxy-5-cyclohexylphenyl) Butane, 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, 4-benzyloxy-4 ′-(2,3-epoxy-2-methylpropoxy) diphenylsulfone, etc.
- benzophenone and triazole ultraviolet absorbers, dispersants, surfactants, antifoaming agents, antioxidants, fluorescent dyes, and the like can be used.
- the electron-donating leuco dye used in the present invention all known ones in the field of conventional pressure-sensitive or thermal recording paper can be used, and are not particularly limited. Compounds, fluorene-based compounds, divinyl-based compounds and the like are preferable. Specific examples of typical colorless or light-colored dyes (dye precursors) are shown below. These dye precursors may be used alone or in combination of two or more.
- the electron-accepting developer used in the present invention all known ones in the field of conventional pressure-sensitive or heat-sensitive recording paper can be used, and are not particularly limited.
- activated clay attapulgite Inorganic acidic substances such as colloidal silica and aluminum silicate, 4,4′-isopropylidenediphenol, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxyphenyl) -4-methyl Pentane, 4,4'-dihydroxydiphenyl sulfide, hydroquinone monobenzyl ether, benzyl 4-hydroxybenzoate, 4,4'-dihydroxydiphenyl sulfone, 2,4'-dihydroxydiphenyl sulfone, 4-hydroxy-4'-isopropoxy Diphenylsulfone, 4-hydroxy-4'-n-propoxy Diphenylsulfone, bis (3-allyl-4-hydroxyphenyl) sulfone, 4-hydroxy-4'-methyldiphen
- N, N′-di-m-chlorophenyl Thiourea compounds such as thiourea, p-chlorobenzoic acid, stearyl gallate, bis [4- (n-octyloxycarbonylamino) salicylate] dihydrate, 4- [2- (p-methoxyphenoxy) ethyloxy] Salicylic acid, 4- [3- (p-tolylsulfonyl) propyloxy] sali
- aromatic carboxylic acids examples thereof include salts with polyvalent metal salts, zinc antithiline complexes of zinc thiocyanate, and complex zinc salts of terephthalaldehyde acid with other aromatic carboxylic acids.
- These developers can be used alone or in combination of two or more.
- the diphenylsulfone cross-linking compound described in International Publication No. WO 97/16420 is available as trade name D-90 manufactured by Nippon Soda Co., Ltd.
- the compounds described in International Publication WO02 / 081229 and the like are available as trade names NKK-395 and D-100 manufactured by Nippon Soda Co., Ltd.
- a metal chelate color-developing component such as higher fatty acid metal double salts and polyvalent hydroxyaromatic compounds described in JP-A-10-258577 can also be contained.
- sensitizers As the sensitizer used in the heat-sensitive recording material of the present invention, conventionally known sensitizers can be used.
- sensitizers include fatty acid amides such as stearamide, palmitic acid amide, ethylene bisamide, montanic acid wax, polyethylene wax, 1,2-di- (3-methylphenoxy) ethane, p-benzylbiphenyl, ⁇ - Benzyloxynaphthalene, 4-biphenyl-p-tolyl ether, m-terphenyl, 1,2-diphenoxyethane, dibenzyl oxalate, di (p-chlorobenzyl) oxalate, di (p-methylbenzyl) oxalate, Dibenzyl terephthalate, benzyl p-benzyloxybenzoate, di-p-tolyl carbonate, phenyl- ⁇ -naphthyl carbonate, 1,4-diethoxynaphthalene
- the types and amounts of the electron-donating leuco dye, electron-accepting developer, and other various components used in the heat-sensitive recording material of the present invention are determined according to the required performance and recording suitability, and are not particularly limited. Usually, about 0.5 to 10 parts by weight of an electron accepting developer and about 0.5 to 10 parts by weight of a sensitizer are used with respect to 1 part by weight of the electron donating leuco dye. Electron-donating leuco dye, electron-accepting developer, and materials to be added as necessary are finely divided to a particle size of several microns or less by a pulverizer such as a ball mill, an attritor, or a sand glider, or an appropriate emulsifier. Depending on the binder and purpose, various additive materials are added to form a coating solution.
- a protective layer and other coating layers commonly used for heat-sensitive recording materials may be provided on the heat-sensitive recording layer, if necessary.
- General-purpose coating machines such as curtain coater, air knife coater, blade coater, gravure coater, roll coater, lip coater and bar coater are used for coating each coating layer such as undercoat layer, heat-sensitive recording layer and protective layer. Can be used.
- the following examples illustrate the invention but are not intended to limit the invention.
- “parts” represents “parts by weight” and “%” represents “% by weight” unless otherwise specified.
- the freeness (Canadian standard freeness, hereinafter referred to as “CSF”) of each pulp was measured according to JIS P8121.
- the support was adjusted to a density of about 0.7 g / cm 3 by machine calendering so that the density would be about the same for the purpose of clarifying the effects of the invention. did.
- the drip water absorbency refers to the drip water absorbency of the surface of the paper support on which the undercoat layer is not provided, on which the heat-sensitive recording layer is provided.
- a support was prepared as follows.
- (Support 1) A raw material obtained by adding and mixing 0.7 parts of aluminum sulfate and 10 parts of calcium carbonate to 100 parts of pulp consisting of 20 parts of TMP of 90 ml of CSF and 80 parts of LBKP of 300 ml of CSF was made with a long net paper machine.
- a clear-size coating solution comprising hydroxyethylated starch (ETHYLEX 2035 manufactured by STALEY) and a cationic sizing agent (cationic polymer of styrene-acrylic acid copolymer resin, LC-5 manufactured by Harima Kasei Co., Ltd.) on both sides.
- the dry coating amount on both surfaces of the hydroxyethylated starch support is 0.67 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer is provided is 0.335 g / m 2 ), and the support of the cationic sizing agent. Coating was performed with a gate roll coater so that the dry coating amount on both sides was 0.15 g / m 2 (the dry coating amount on the surface on which the heat-sensitive recording layer was provided was 0.075 g / m 2 ).
- a paper support having a basis weight of 48 g / m 2 and an ash content of 5% was obtained by processing so as to have a density of 0.7 g / cm 3 with a calendar.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 170 seconds.
- Undercoat layer coating solution having the following composition was applied and dried on one side of the paper support obtained above, so that the dry coating amount of the undercoat layer was 5.0 g / m 2 .
- the support provided with the undercoat layer is referred to as support 1.
- Undercoat layer coating solution calcined kaolin (Ansilex 90 manufactured by Engelhard, Inc., oil absorption 90c c / 100 g) 100 parts Styrene-butadiene copolymer latex (solid content 48%) 40 parts Polyvinyl alcohol 10% aqueous solution 30 parts Water 146 parts
- the dry coating amount on both sides of the hydroxyethylated starch support is 1 g / m 2 (the dry coating amount on the surface on which the heat-sensitive recording layer is provided is 0.5 g / m 2 ), and the cationic sizing agent on both sides of the support.
- Coating was performed with a gate roll coater such that the dry coating amount was 0.06 g / m 2 (the dry coating amount on the surface on which the heat-sensitive recording layer was provided was 0.03 g / m 2 ).
- a paper support having a basis weight of 48 g / m 2 and an ash content of 5% was obtained by processing so as to have a density of 0.7 g / cm 3 with a calendar.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 110 seconds.
- Undercoat layer coating solution having the following composition was applied and dried on one side of the paper support obtained above, so that the dry coating amount of the undercoat layer was 8.0 g / m 2 .
- the support provided with the undercoat layer is referred to as support 2.
- Undercoat layer coating solution calcined kaolin (Ansilex 90 manufactured by Engelhard, Inc., oil absorption 90c c / 100 g) 100 parts Styrene-butadiene copolymer latex (solid content 48%) 40 parts Polyvinyl alcohol 10% aqueous solution 30 parts Water 146 parts
- Example 1 Thermosensitive recording layer
- the developer dispersion liquid (A liquid), leuco dye dispersion liquid (B liquid) and sensitizer dispersion liquid (C liquid) having the following composition are separately wetted with a sand grinder until the average particle size becomes 0.5 ⁇ m. Grinding was performed.
- Liquid A developer dispersion
- 4-hydroxy-4'-isopropoxydiphenylsulfone 6.0 parts polyvinyl alcohol 10% aqueous solution 18.8 parts water 11.2 parts
- Liquid B leuco dye dispersion
- 3-Dibutylamino-6-methyl-7-anilinofluorane OLB- 2
- C liquid (sensitizer dispersion)
- Dibenzyl oxalate 6.0 parts
- the dispersion liquid is mixed at the following ratio to prepare a heat-sensitive recording layer coating liquid, and this heat-sensitive recording layer coating liquid is dried onto the undercoat layer of the support 1 obtained above.
- the coating and drying were carried out so as to obtain 6.0 g / m 2 .
- This sheet was processed with a super calendar so that the smoothness of the heat-sensitive recording surface was 500 to 1000 seconds to obtain a heat-sensitive recording material.
- Coating liquid for heat-sensitive recording layer Liquid A (developer dispersion) 36.0 parts Liquid B (leuco dye dispersion) 9.2 parts Liquid C (sensitizer dispersion) 36.0 parts Carboxy-modified polyvinyl alcohol 25 0.0 part surfactant (manufactured by Nissin Chemical Co., Surfinol 104, solid content: 50%) 0.5 parts Polyamide epichlorohydrin resin 2.0 parts
- Example 2 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the pulp composition was changed to 40 parts of TMP and 60 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 150 seconds.
- Example 3 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the pulp composition was changed to 70 parts of TMP and 30 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 100 seconds.
- Example 4 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the pulp composition was 10 parts of TMP, 10 parts of RGP (CSF 70 ml), 5 parts of NBKP (CSF 470 ml), and 75 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 155 seconds.
- Example 5 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the pulp composition was changed to 30 parts of TMP, 20 parts of RGP, 5 parts of NBKP, and 45 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 110 seconds.
- Example 6 A heat-sensitive recording material was obtained using the support 2 in the same manner as in Example 1.
- Example 7 A heat-sensitive recording material was obtained in the same manner as in Example 6 except that the pulp was mixed with 95 parts of TMP 5 parts and CSF 300 ml of waste paper pulp (mixing ratio of mechanical pulp 10%, the same shall apply hereinafter). The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 90 seconds.
- Example 8 Example 7 except that the dry coating amount of the both sides of the support of the cationic sizing agent was 0.04 g / m 2 (the dry coating amount on the surface on which the heat-sensitive recording layer was provided was 0.02 g / m 2 ).
- Example 9 Example 7 except that the dry coating amount of the both sides of the support of the cationic sizing agent was 0.08 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer was provided was 0.04 g / m 2 ). In the same manner, a heat-sensitive recording material was obtained. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 150 seconds.
- Example 10 In addition to the addition of alkyl ketene dimer (AD1604 manufactured by Seiko PMC, solid content of 30%) as an internal sizing agent to the support material so that the solid content of the pulp slurry is 0.15% per pulp weight. Obtained a heat-sensitive recording material in the same manner as in Example 7. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 110 seconds.
- Example 11 A heat-sensitive recording material was obtained in the same manner as in Example 6 except that the pulp content was 20 parts TMP and 80 parts waste paper pulp. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 80 seconds.
- Example 12 A heat-sensitive recording material was obtained in the same manner as in Example 6 except that the pulp content was 40 parts TMP and 60 parts waste paper pulp. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 70 seconds.
- Example 13 A heat-sensitive recording material was obtained in the same manner as in Example 7 except that the basis weight of the support was 30 g / m 2 . The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 90 seconds.
- Example 14 A heat-sensitive recording material was obtained in the same manner as in Example 7 except that the basis weight of the support was 80 g / m 2 . The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 90 seconds.
- Example 15 A heat-sensitive recording material was obtained in the same manner as in Example 6 except that the pulp composition was changed to 10 parts of LBKP and 90 parts of used paper pulp. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 90 seconds.
- Example 16 A heat-sensitive recording material was obtained in the same manner as in Example 6 except that the pulp composition was changed to 60 parts of TMP and 40 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 50 seconds.
- thermosensitive recording material was obtained in the same manner as in Example 7 except that the cationic sizing agent of the clear size coating solution was alkyl ketene dimer (SK Resin S-20 manufactured by Japan PMC Co., Ltd.). The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 90 seconds.
- a thermal recording layer was obtained by applying the thermal recording layer coating solution in the same manner as in Example 6 except that the undercoat layer was not provided on the support.
- the pulp composition was 10 parts of TMP, 10 parts of RGP (CSF 70 ml), 5 parts of NBKP (CSF 470 ml), 75 parts of LBKP, and the dry coating amount of both sides of the support of the cationic sizing agent was 0.4 g / m 2 (thermal recording layer)
- a heat-sensitive recording material was obtained in the same manner as in Example 6 except that the dry coating amount on the surface provided with 2 was 0.2 g / m 2 ).
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 230 seconds.
- Example 20 The pulp formulation is 10 parts of TMP, 10 parts of RGP, 5 parts of NBKP, 75 parts of LBKP, and the dry coating amount of the both sides of the support of the cationic sizing agent is 0.6 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer is provided) Was 0.3 g / m 2 ), and a heat-sensitive recording material was obtained in the same manner as in Example 6.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 340 seconds.
- the pulp composition is 10 parts of TMP, 10 parts of RGP, 5 parts of NBKP, 75 parts of LBKP, and the dry coating amount of both sides of the support of the cationic sizing agent is 1.0 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer is provided) Is 0.5 g / m 2 ), and a heat-sensitive recording material was obtained in the same manner as in Example 6.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 700 seconds.
- the pulp composition was 10 parts of TMP, 10 parts of RGP, 5 parts of NBKP, and 75 parts of LBKP.
- an anionic sizing agent anionic polymer of styrene-acrylic acid copolymer resin, Arakawa Chemical) PM1343 manufactured by Co., Ltd. was used, and the dry coating amount of the anionic sizing agent on both sides of the support was 0.15 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer was provided was 0.075 g / m 2 ).
- a thermosensitive recording material was obtained in the same manner as in Example 6 except that.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 70 seconds.
- the pulp composition was 10 parts of TMP, 10 parts of RGP, 5 parts of NBKP, and 75 parts of LBKP.
- an anionic sizing agent anionic polymer of styrene-acrylic acid copolymer resin, Arakawa Chemical) PM1343 manufactured by Co., Ltd. is used, and the dry coating amount of the both sides of the support of the anionic sizing agent is 1.0 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer is provided is 0.5 g / m 2 ).
- thermosensitive recording material was obtained in the same manner as in Example 6 except that.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 450 seconds.
- the pulp formulation is 10 parts of TMP, 10 parts of RGP, 5 parts of NBKP, 75 parts of LBKP, and a nonionic synthetic sizing agent (nonionic synthetic oligomer, WSA40 manufactured by Arakawa Chemical Co., Ltd.) is used instead of the cationic sizing agent of the clear size coating liquid.
- the dry coating amount of the nonionic synthetic sizing agent on both sides of the support was 0.8 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer was provided was 0.4 g / m 2 ).
- a heat-sensitive recording material was obtained in the same manner as in Example 6. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 50 seconds.
- Example 1 A heat-sensitive recording material was obtained in the same manner as in Example 1 except that the pulp composition was changed to 100 parts of LBKP. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 190 seconds.
- Comparative Example 2 Except for adding 100 parts of LBKP to the pulp slurry and adding a bulking agent (KB115 manufactured by Kao Corporation, ester of polyhydric alcohol and saturated fatty acid) to 0.5% per weight of pulp. In the same manner as in Example 1, a heat-sensitive recording material was obtained. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 160 seconds.
- Example 6 except that the dry coating amount of the both sides of the support of the cationic sizing agent was 0.02 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer was provided was 0.01 g / m 2 ). In the same manner, a heat-sensitive recording material was obtained. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 30 seconds.
- a thermal recording material was obtained in the same manner as in Comparative Example 4.
- Example 7 except that the dry coating amount of the both sides of the support of the cationic sizing agent was 0.02 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer was provided was 0.01 g / m 2 ). In the same manner, a heat-sensitive recording material was obtained. The drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 10 seconds.
- the pulp composition is 10 parts of TMP, 10 parts of RGP (CSF 70 ml), 5 parts of NBKP (CSF 470 ml) and 75 parts of LBKP.
- the dry coating amount of the both sides of the support of the anionic sizing agent is 0.06 g / m 2 (the dry coating amount on the surface on which the thermosensitive recording layer is provided Is 0.03 g / m 2 ), and a heat-sensitive recording material was obtained in the same manner as in Example 6.
- the drip water absorption on the surface of the paper support on which the heat-sensitive recording layer was provided was 20 seconds.
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Abstract
Description
一般に紙の不透明度を向上させる方法として、紙を嵩高にすることが知られている。感熱記録体の分野では、多価アルコールなどの嵩高剤を添加した支持体を用いて、発色感度を向上させた感熱記録体が開示されている(特許文献1)。
また機械パルプは新聞紙や雑誌等の原料として用いられているが、一般に機械パルプを使用することで紙が嵩高になることが知られている(特許文献2など)。
また、裏面にインクジェット記録適性を持たせた感熱記録体において、支持体と感熱記録層との間に二層の下塗り層を設けることにより、インクジェット記録された場合に感熱記録面に対するインクジェットのインクによる影響を抑制する方法が開示されている(特許文献3)。
また支持体に機械パルプを用いた場合、支持体上に感熱記録層を塗工する際に、塗工液が支持体中に含浸しやすく、塗工層の被覆性や平滑性が低下し(沈み込み)、印字濃度や再印字性(保存後の印字濃度)が低下する。
そのため、本発明は、感熱記録体の裏面(感熱記録層の反対面)に印刷した場合においても、感熱記録面に印字した画像品質、特にバーコード読取り性に優れ、かつ印字濃度、再印字性が良好である感熱記録体を提供することを目的とする。
即ち、本発明は、支持体上に、無色ないし淡色の電子供与性ロイコ染料及び電子受容性顕色剤を含有する感熱記録層を設けた感熱記録体であって、該支持体が機械パルプを5重量%以上含有するパルプから成り、該支持体の感熱記録層を設ける面の点滴吸水度(滴下水の量を0.001mlとする以外は、紙パルプ技術協会 J.TAPPI No.32-2:2000に規定される点滴吸水度に準じる。)が50秒以上である感熱記録体である。
木材繊維の形態がほとんどそのまま残って単繊維化している化学パルプに比べ、機械パルプは大部分が破断した繊維及び繊維束である。そのため機械パルプを含有したシートは嵩が高くなることにより、高い不透明性を有している。さらに、機械パルプは疎水性のリグニンで固められているため、インキに対する高い吸着性を有しているとともに機械パルプ自体が空隙を有している。そのため機械パルプを含有したシートは疎水性であるインキの着肉性に優れる。
これに対して、親水性である嵩高剤を含有したシートは、嵩が高くなることにより、高い不透明性を有しているが、疎水性であるインキに対する着肉性が不十分であるため、印刷した際に反対面へインキが浸透しやすいという問題(即ち、印刷裏抜け)が発生する。
特に、サーモメカニカルパルプ(TMP)は、他の機械パルプに比べて比散乱係数が高く、高い不透明度を得られることから、本願発明の感熱記録体の支持体として好ましく用いられる。
古紙パルプとは、古紙を原料とし、脱墨工程にてこれらの古紙に含まれるインキを除去したパルプを指す。古紙に含まれるインキとしては、印刷インキ(日本印刷学会編、"印刷工学便覧"、技報堂、p.606、1983)、ノンインパクトプリンティングインキ("最新・特殊機能インキ"、シーエムシー、p1、1990)や主に新聞、更紙系雑誌に用いられる非加熱の浸透乾燥方式のオフセットインキ(後藤朋之、日本印刷学会誌、38(5)、7、(2001)など)が挙げられる。
古紙は、新聞、チラシ、更紙系雑誌、ダンボールなどの機械パルプを主原料パルプとして含有する古紙と、コート紙系雑誌、感熱・感圧紙、模造・色上質紙、コピー用紙、コンピューターアウトプット用紙などの化学パルプを主原料パルプとして含有する古紙に大分される。
古紙に含まれる機械パルプや化学パルプは、その性質を保持している。古紙に含まれる機械パルプは、上述したように、嵩が高く、機械パルプを含む古紙を含有したシートは高い不透明性を有している。
非木材パルプとしては、バガスパルプやワラパルプなどが挙げられる。
機械パルプの配合割合が支持体のパルプ全体に対して5重量%未満では十分な不透明度を得ることが難しくなり、インキ裏抜け防止効果が期待できない。一方、機械パルプの配合割合を25重量%より多くすると、インキ裏抜け防止効果は向上するが支持体表面の平滑性が低下する傾向が見られる。その結果、支持体上に感熱記録層を塗工した際の塗工面の均一性が低下し、印字した画像の精細性は低下するため、バーコード読取り性の向上効果は飽和する傾向が見られる。特に機械パルプの配合割合を50重量%より多くすると、印字した画像の精細性の低下が大きく印字濃度、再印字性が低下すると共に、パルプ繊維の絡み合い(繊維間結合)の減少に伴い支持体の強度が低下するため、印刷時にインキのタック(粘着性)により、支持体表層が引き剥がされる紙剥けなどの問題が発生することがある。
古紙パルプを使用する場合、この機械パルプには古紙パルプが含有する機械パルプも含まれ、古紙パルプ中の機械パルプの配合割合は、JIS P8120に準じて測定される。支持体のパルプ全体に対する古紙パルプの配合割合は、インキ裏抜け防止効果と印字画像の精細さのバランスを最適化する目的で、好ましくは5~95重量%の範囲、より好ましくは5~80重量%、更に好ましくは5~60重量%である。
この点滴吸水度は、滴下水の量を1μl(0.001ml)とした以外は、紙パルプ技術協会 J.TAPPI No.32-2:2000(紙-吸水試験方法-第2部:滴下法)に準じて測定する。即ち、測定用試験片(紙)を水平に張り、その測定面(即ち、感熱記録層を設ける面)に、蒸留水1μl(0.001ml)を滴下したときの、目視観察で水滴が吸収されるまでの時間を測定する。この測定用試験片(紙)の大きさは、この測定ができるものであればよく、例えば、直径が少なくとも40mm程度の円形のものを用いてもよい。
点滴吸水度は、時間(秒)で表わされ、点滴吸水度が高いほど吸水性は低く、点滴吸水度が低いほど吸水性は高い。
支持体の感熱記録層を設ける面の点滴吸水度が50秒以上であることにより、支持体上に感熱記録層を塗工した際の塗工液の沈み込みを抑制して塗工層の有効層厚が大きくなり、かつ均一な塗工面が得られるため、印字した画像の精細性が向上してバーコード読取り性、印字濃度、再印字性が良好となる。点滴吸水度は、好ましくは80秒以上であり、更に好ましくは100秒以上である。点滴吸水度が高いとバーコード読取り性、印字濃度、再印字性は良好となる。支持体の感熱記録層を設ける面の点滴吸水度が50秒未満であると、支持体上に感熱記録層を塗工した際の塗工液の沈み込みが大きく、十分なバーコード読取り性、印字濃度、再印字性が得られない。一方、点滴吸水度が高すぎると、一般印刷において、インキのハジキによる印刷ムラ(特に網点部での濃度ムラ)が発生したり、インキの定着性低下による再転写(印刷後にインキが他の印刷物や印刷版胴に転写すること。)などの問題が生じてくることから、点滴吸水度は好ましくは300秒以下、より好ましくは200秒以下である。
内添のためのサイズ剤(内添サイズ剤)としては、酸性抄造の場合、強化ロジンサイズ剤、エマルジョンサイズ剤、合成系サイズ剤などが、中性抄造の場合、アルキルケテンダイマー(AKD)、アルケニルコハク酸無水物(ASA)などが用いられる。
また、外添のためのサイズ剤(外添サイズ剤)としては、スチレン-マレイン酸系共重合体樹脂、スチレン-アクリル酸系共重合体樹脂などのカチオン性ポリマーやアニオン性ポリマー、スチレン系ポリマー、イソシアネート系ポリマーなどのカチオン性ポリマー、ロジン、トール油及びフタル酸などのアルキド樹脂ケン化物、石油樹脂とロジンのケン化物などのアニオン性低分子化合物、α-オレフィン-マレイン酸系共重合体樹脂、アクリル酸エステル-アクリル酸系共重合体樹脂、アルキルケテンダイマー(AKD)などが挙げられるが、中性抄紙下でセルロース中のカルボキシル基と相互作用しやすいスチレン-アクリル酸系共重合体樹脂のカチオン性ポリマーやアルキルケテンダイマー(AKD)が好ましく、特にスチレン-アクリル酸系共重合体樹脂のカチオン性ポリマーがより好ましい。
また、支持体が古紙パルプを含有する場合、古紙パルプに含有される界面活性剤などの影響により支持体の点滴吸水度が低下する傾向が見られる。
このような場合においても、サイズ剤の種類、使用量、添加方法を適宜選択し調節して、所望の点滴吸水度を得ることができる。
更に必要に応じて支持体に、抄造工程で通常使用される薬品類、例えば、紙力増強剤、消泡剤、着色剤等の各種助剤を適宜配合してもよい。
サイズ剤を内添する場合の添加量は、所望の点滴吸水度を与えるような量にすればよいが、好ましくは固形分で対パルプ重量あたり0.1~1重量%、より好ましくは0.05~0.5重量%である。
表面強度を高める水溶性高分子物質としては、例えば、澱粉、酵素変性澱粉、熱化学変性澱粉、酸化澱粉、エステル化澱粉、エーテル化澱粉(例えば、ヒドロキシエチル化澱粉など)、カチオン化澱粉などの澱粉類、ポリビニルアルコール、完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、カルボキシル変性ポリビニルアルコール、シラノール変性ポリビニルアルコール、カチオン変性ポリビニルアルコール、末端アルキル変性ポリビニルアルコールなどのポリビニルアルコール類、ポリアクリルアミド、カチオン性ポリアクリルアミド、アニオン性ポリアクリルアミド、両性ポリアクリルアミドなどのポリアクリルアミド類、スチレン・ブタジエン共重合体、ポリ酢酸ビニル、塩化ビニル-酢酸ビニル共重合体、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリル酸エステルなどが挙げられる。これらは、単独又は2種類以上混合して用いられる。
塗工液には必要に応じて、分散剤、可塑剤、pH調整剤、消泡剤、保水剤、防腐剤、接着剤、着色染料、紫外線防止剤等の各種助剤を適宜配合してもよい。
塗工液の固形分濃度は、組成や塗工装置等により適宜調整されるが、通常5~15重量%程度である。
また、ゲートロールコーター、サイズプレスコーター等の両面同時塗工を行う塗工装置を用いた場合は、支持体の両面に均等に塗工されるため、支持体の感熱記録層を設ける面の塗工量は、両面を合わせた塗工量の半分となる。
この下塗り層は、主としてバインダーと顔料とから成る。
バインダーとしては、一般的に使用されている水溶性高分子あるいは疎水性高分子のエマルジョン等が適宜使用可能である。具体例としては、ポリビニルアルコール、ポリビニルアセタール、ヒドロキシエチルセルロース、メチルセルロース、カルボキシメチルセルロース、等のセルロース誘導体、デンプンとその誘導体、ポリアクリル酸ソーダ、ポリビニルピロリドン、アクリル酸アミド/アクリル酸エステル共重合体、アクリル酸アミド/アクリル酸エステル/メタクリル酸共重合体、スチレン/無水マレイン酸共重合体アルカリ塩、イソブチレン/無水マレイン酸共重合体アルカリ塩、ポリアクリルアミド、アルギン酸ソーダ、ゼラチン、カゼイン等の水溶性高分子、ポリ酢酸ビニル、ポリウレタン、スチレン/ブタジエン共重合体、ポリアクリル酸、ポリアクリル酸エステル、塩化ビニル/酢酸ビニル共重合体、ポリブチルメタクリレート、エチレン/酢酸ビニル共重合体、スチレン/ブタジエン/アクリル系共重合体等の疎水性高分子のエマルジョンを用いることができる。これらのバインダーは1種又は2種以上用いてもよい。
下塗り層中の顔料は、全固形分に対して、通常50~95重量%、好ましくは70~90重量%である。
下塗り層の塗工液には必要に応じて、分散剤、可塑剤、pH調整剤、消泡剤、保水剤、防腐剤、着色染料、紫外線防止剤等の各種助剤を適宜配合してもよい。
下塗り層の乾燥後の塗工量は、好ましくは15g/m2以下、より好ましくは1~15g/m2、更に好ましくは3~10g/m2である。
更に、感熱記録体の裏面(即ち、感熱記録層の反対面)に印刷した際に、下塗り層は感熱記録面へインキが浸透することを抑制する効果がある。本発明では、前述の通り下塗り層の有効層厚が大きく、かつ均一な塗工面が得られるため、下塗り層を厚くしたり、下塗り層を多層にして、インキが浸透しないようなバリア性を持たせる必要は無い。従って、本発明の感熱記録体においては、下塗り層の乾燥後の塗工量は比較的少ない。
以下、本発明の感熱記録層に使用される各種材料を例示するが、これらの材料は感熱記録層等をはじめとする必要に応じて設けられた各塗工層にも使用することができる。
本発明で使用するバインダーとしては、完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、アセトアセチル化ポリビニルアルコール、カルボキシ変性ポリビニルアルコール、アマイド変性ポリビニルアルコール、スルホン酸変性ポリビニルアルコール、ブチラール変性ポリビニルアルコール、オレフィン変性ポリビニルアルコール、ニトリル変性ポリビニルアルコール、ピロリドン変性ポリビニルアルコール、シリコーン変性ポリビニルアルコール、その他の変性ポリビニルアルコール、ヒドロキシエチルセルロース、メチルセルロース、エチルセルロース、カルボキシメチルセルロース、スチレン-無水マレイン酸共重合体、スチレン-ブタジエン共重合体並びにエチルセルロース、アセチルセルロースのようなセルロース誘導体、カゼイン、アラビヤゴム、酸化澱粉、エーテル化澱粉、ジアルデヒド澱粉、エステル化澱粉、ポリ塩化ビニル、ポリ酢酸ビニル、ポリアクリルアミド、ポリアクリル酸エステル、ポリビニルブチラール、ポリスチロース及びそれらの共重合体、ポリアミド樹脂、シリコーン樹脂、石油樹脂、テルペン樹脂、ケトン樹脂、クマロ樹脂などを例示することができる。これらの高分子物質は水、アルコール、ケトン類、エステル類、炭化水素などの溶剤に溶かして使用するほか、水又は他の媒体中に乳化又はペースト状に分散した状態で使用し、要求品質に応じて併用することもできる。
本発明で使用する顔料としては、シリカ、炭酸カルシウム、カオリン、焼成カオリン、ケイソウ土、タルク、酸化チタン、水酸化アルミニウムなどの無機顔料などが挙げられる。
本発明で使用する滑剤としては、ステアリン酸亜鉛、ステアリン酸カルシウム等の脂肪酸金属塩、ワックス類、シリコーン樹脂類などが挙げられる。
このほかにベンゾフェノン系やトリアゾール系の紫外線吸収剤、分散剤、界面活性剤、消泡剤、酸化防止剤、蛍光染料等を使用することができる。
<トリフェニルメタン系ロイコ染料>
3,3-ビス(p-ジメチルアミノフェニル)-6-ジメチルアミノフタリド〔別名クリスタルバイオレットラクトン〕、3,3-ビス(p-ジメチルアミノフェニル)フタリド〔別名マラカイトグリーンラクトン〕
3-ジエチルアミノ-6-メチルフルオラン、3-ジエチルアミノ-6-メチル-7-アニリノフルオラン、3-ジエチルアミノ-6-メチル-7-(o,p-ジメチルアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-クロロフルオラン、3-ジエチルアミノ-6-メチル-7-(m-トリフルオロメチルアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-(o-クロロアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-(p-クロロアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-(o-フルオロアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-(m-メチルアニリノ)フルオラン、3-ジエチルアミノ-6-メチル-7-n-オクチルアニリノフルオラン、3-ジエチルアミノ-6-メチル-7-n-オクチルアミノフルオラン、3-ジエチルアミノ-6-メチル-7-ベンジルアミノフルオラン、3-ジエチルアミノ-6-メチル-7-ジベンジルアミノフルオラン、3-ジエチルアミノ-6-クロロ-7-メチルフルオラン、3-ジエチルアミノ-6-クロロ-7-アニリノフルオラン、3-ジエチルアミノ-6-クロロ-7-p-メチルアニリノフルオラン、3-ジエチルアミノ-6-エトキシエチル-7-アニリノフルオラン、3-ジエチルアミノ-7-メチルフルオラン、3-ジエチルアミノ-7-クロロフルオラン、3-ジエチルアミノ-7-(m-トリフルオロメチルアニリノ)フルオラン、3-ジエチルアミノ-7-(o-クロロアニリノ)フルオラン、3-ジエチルアミノ-7-(p-クロロアニリノ)フルオラン、3-ジエチルアミノ-7-(o-フルオロアニリノ)フルオラン、3-ジエチルアミノ-ベンゾ〔a〕フルオラン、3-ジエチルアミノ-ベンゾ〔c〕フルオラン、3-ジブチルアミノ-6-メチル-フルオラン、3-ジブチルアミノ-6-メチル-7-アニリノフルオラン、3-ジブチルアミノ-6-メチル-7-(o,p-ジメチルアニリノ)フルオラン、3-ジブチルアミノ-6-メチル-7-(o-クロロアニリノ)フルオラン、3-ジブチルアミノ-6-メチル-7-(p-クロロアニリノ)フルオラン、3-ジブチルアミノ-6-メチル-7-(o-フルオロアニリノ)フルオラン、3-ジブチルアミノ-6-メチル-7-(m-トリフルオロメチルアニリノ)フルオラン、3-ジブチルアミノ-6-メチル-7-クロロフルオラン、3-ジブチルアミノ-6-エトキシエチル-7-アニリノフルオラン、3-ジブチルアミノ-6-クロロ-7-アニリノフルオラン、3-ジブチルアミノ-6-メチル-7-p-メチルアニリノフルオラン、3-ジブチルアミノ-7-(o-クロロアニリノ)フルオラン、3-ジブチルアミノ-7-(o-フルオロアニリノ)フルオラン、3-ジ-n-ペンチルアミノ-6-メチル-7-アニリノフルオラン、3-ジ-n-ペンチルアミノ-6-メチル-7-(p-クロロアニリノ)フルオラン、3-ジ-n-ペンチルアミノ-7-(m-トリフルオロメチルアニリノ)フルオラン、3-ジ-n-ペンチルアミノ-6-クロロ-7-アニリノフルオラン、3-ジ-n-ペンチルアミノ-7-(p-クロロアニリノ)フルオラン、3-ピロリジノ-6-メチル-7-アニリノフルオラン、3-ピペリジノ-6-メチル-7-アニリノフルオラン、3-(N-メチル-N-プロピルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-メチル-N-シクロヘキシルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-シクロヘキシルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-キシルアミノ)-6-メチル-7-(p-クロロアニリノ)フルオラン、3-(N-エチル-p-トルイディノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-イソアミルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-イソアミルアミノ)-6-クロロ-7-アニリノフルオラン、3-(N-エチル-N-テトラヒドロフルフリルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-イソブチルアミノ)-6-メチル-7-アニリノフルオラン、3-(N-エチル-N-エトキシプロピルアミノ)-6-メチル-7-アニリノフルオラン、3-シクロヘキシルアミノ-6-クロロフルオラン、2-(4-オキサヘキシル)-3-ジメチルアミノ-6-メチル-7-アニリノフルオラン、2-(4-オキサヘキシル)-3-ジエチルアミノ-6-メチル-7-アニリノフルオラン、2-(4-オキサヘキシル)-3-ジプロピルアミノ-6-メチル-7-アニリノフルオラン、2-メチル-6-p-(p-ジメチルアミノフェニル)アミノアニリノフルオラン、2-メトキシ-6-p-(p-ジメチルアミノフェニル)アミノアニリノフルオラン、2-クロロ-3-メチル-6-p-(p-フェニルアミノフェニル)アミノアニリノフルオラン、2-クロロ-6-p-(p-ジメチルアミノフェニル)アミノアニリノフルオラン、2-ニトロ-6-p-(p-ジエチルアミノフェニル)アミノアニリノフルオラン、2-アミノ-6-p-(p-ジエチルアミノフェニル)アミノアニリノフルオラン、2-ジエチルアミノ-6-p-(p-ジエチルアミノフェニル)アミノアニリノフルオラン、2-フェニル-6-メチル-6-p-(p-フェニルアミノフェニル)アミノアニリノフルオラン、2-ベンジル-6-p-(p-フェニルアミノフェニル)アミノアニリノフルオラン、2-ヒドロキシ-6-p-(p-フェニルアミノフェニル)アミノアニリノフルオラン、3-メチル-6-p-(p-ジメチルアミノフェニル)アミノアニリノフルオラン、3-ジエチルアミノ-6-p-(p-ジエチルアミノフェニル)アミノアニリノフルオラン、3-ジエチルアミノ-6-p-(p-ジブチルアミノフェニル)アミノアニリノフルオラン、2,4-ジメチル-6-〔(4-ジメチルアミノ)アニリノ〕-フルオラン
3,6,6'-トリス(ジメチルアミノ)スピロ〔フルオレン-9,3'-フタリド〕、 3,6,6'-トリス(ジエチルアミノ)スピロ〔フルオレン-9,3'-フタリド〕
<ジビニル系ロイコ染料>
3,3-ビス-〔2-(p-ジメチルアミノフェニル)-2-(p-メトキシフェニル)エテニル〕-4,5,6,7-テトラブロモフタリド、3,3-ビス-〔2-(p-ジメチルアミノフェニル)-2-(p-メトキシフェニル)エテニル〕-4,5,6,7-テトラクロロフタリド、3,3-ビス-〔1,1-ビス(4-ピロリジノフェニル)エチレン-2-イル〕-4,5,6,7-テトラブロモフタリド、3,3-ビス-〔1-(4-メトキシフェニル)-1-(4-ピロリジノフェニル)エチレン-2-イル〕-4,5,6,7-テトラクロロフタリド
3-(4-ジエチルアミノ-2-エトキシフェニル)-3-(1-エチル-2-メチルインドール-3-イル)-4-アザフタリド、3-(4-ジエチルアミノ-2-エトキシフェニル)-3-(1-オクチル-2-メチルインドール-3-イル)-4-アザフタリド、3-(4-シクロヘキシルエチルアミノ-2-メトキシフェニル)-3-(1-エチル-2-メチルインドール-3-イル)-4-アザフタリド、3,3-ビス(1-エチル-2-メチルインドール-3-イル)フタリド、3,6-ビス(ジエチルアミノ)フルオラン-γ-(3'-ニトロ)アニリノラクタム、3,6-ビス(ジエチルアミノ)フルオラン-γ-(4'-ニトロ)アニリノラクタム、1,1-ビス-〔2',2',2'',2''-テトラキス-(p-ジメチルアミノフェニル)-エテニル〕-2,2-ジニトリルエタン、1,1-ビス-〔2',2',2'',2''-テトラキス-(p-ジメチルアミノフェニル)-エテニル〕-2-β-ナフトイルエタン、1,1-ビス-〔2',2',2'',2''-テトラキス-(p-ジメチルアミノフェニル)-エテニル〕-2,2-ジアセチルエタン、ビス-〔2,2,2',2'-テトラキス-(p-ジメチルアミノフェニル)-エテニル〕-メチルマロン酸ジメチルエステル
電子供与性ロイコ染料、電子受容性顕色剤並びに必要に応じて添加する材料は、ボールミル、アトライター、サンドグライダーなどの粉砕機あるいは適当な乳化装置によって数ミクロン以下の粒子径になるまで微粒化し、バインダー及び目的に応じて各種の添加材料を加えて塗液とする。
下塗り層、感熱記録層、保護層などの各塗工層の塗工には、カーテンコーター、エアーナイフコーター、ブレードコーター、グラビアコーター、ロールコーター、リップコーター及びバーコーター等、汎用の塗工機を用いることができる。
なお、各実施例中、特にことわらない限り「部」は「重量部」、「%」は「重量%」を示す。各パルプのフリーネス(カナダ標準濾水度、以下「CSF」という。)はJIS P8121に準じて測定した。
なお、以下の実施例と比較例において、発明の効果を明らかにする目的で密度が同程度となるように、支持体はマシンカレンダー処理によって密度が0.7g/cm3程度となるように調整した。
また、点滴吸水度は、下塗り層を設けていない紙支持体の感熱記録層を設ける面の点滴吸水度を指す。
(支持体1)
CSF90mlのTMP20部とCSF300mlのLBKP80部からなるパルプ100部に対して硫酸アルミニウム0.7部と炭酸カルシウム10部を添加・混合した原料を、長網抄造機で抄造した。その両面に、ヒドロキシエチル化澱粉(STALEY社製ETHYLEX2035)及びカチオン性サイズ剤(スチレン-アクリル酸系共重合体樹脂のカチオン性ポリマー、ハリマ化成株式会社製LC-5)からなるクリヤーサイズ塗工液を、ヒドロキシエチル化澱粉の支持体両面の乾燥塗工量が0.67g/m2(感熱記録層を設ける面の乾燥塗工量が0.335g/m2)、カチオン性サイズ剤の支持体両面の乾燥塗工量が0.15g/m2(感熱記録層を設ける面の乾燥塗工量が0.075g/m2)になるように、ゲートロールコーターで塗工した。カレンダーで密度が0.7g/cm3になるように処理することにより、坪量48g/m2、灰分5%の紙支持体を得た。この紙支持体の感熱記録層を設ける面の点滴吸水度は170秒であった。
下塗り層用塗工液
焼成カオリン(エンゲルハード社製アンシレックス90、吸油量90c
c/100g) 100部
スチレン・ブタジエン共重合体ラテックス(固形分48%) 40部
ポリビニルアルコール 10%水溶液 30部
水 146部
CSF90mlのTMP20部とCSF300mlのLBKP80部からなるパルプ100部に対して硫酸アルミニウム0.7部と炭酸カルシウム10部を添加・混合した原料を、長網抄造機で抄造した。その両面に、ヒドロキシエチル化澱粉(STALEY社製 ETHYLEX2035)及びカチオン性サイズ剤(スチレン-アクリル酸系共重合体樹脂のカチオン性ポリマー、ハリマ化成株式会社製 LC-5)からなるクリヤーサイズ塗工液を、ヒドロキシエチル化澱粉の支持体両面の乾燥塗工量が1g/m2(感熱記録層を設ける面の乾燥塗工量が0.5g/m2)、カチオン性サイズ剤の支持体両面の乾燥塗工量が0.06g/m2(感熱記録層を設ける面の乾燥塗工量が0.03g/m2)になるように、ゲートロールコーターで塗工した。カレンダーで密度が0.7g/cm3になるように処理することにより、坪量48g/m2、灰分5%の紙支持体を得た。この紙支持体の感熱記録層を設ける面の点滴吸水度は110秒であった。
下塗り層用塗工液
焼成カオリン(エンゲルハード社製アンシレックス90、吸油量90c
c/100g) 100部
スチレン・ブタジエン共重合体ラテックス(固形分48%) 40部
ポリビニルアルコール 10%水溶液 30部
水 146部
(感熱記録層)
下記配合の顕色剤分散液(A液)、ロイコ染料分散液(B液)及び増感剤分散液(C液)を、それぞれ別々にサンドグラインダーで平均粒子径が0.5μmになるまで湿式磨砕を行なった。
A液(顕色剤分散液)
4-ヒドロキシ-4'-イソプロポキシジフェニルスルホン 6.0部
ポリビニルアルコール 10%水溶液 18.8部
水 11.2部
B液(ロイコ染料分散液)
3-ジブチルアミノ-6-メチル-7-アニリノフルオラン(ODB-
2) 2.0部
ポリビニルアルコール 10%水溶液 4.6部
水 2.6部
C液(増感剤分散液)
シュウ酸ジベンジル 6.0部
ポリビニルアルコール 10%水溶液 18.8部
水 11.2部
感熱記録層用塗工液
A液(顕色剤分散液) 36.0部
B液(ロイコ染料分散液) 9.2部
C液(増感剤分散液) 36.0部
カルボキシ変性ポリビニルアルコール 25.0部
界面活性剤(日信化学社製、サーフィノール104、固形分:50%)
0.5部
ポリアミドエピクロロヒドリン樹脂 2.0部
パルプ配合を、TMP40部、LBKP60部とした以外は、実施例1と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は150秒であった。
[実施例3]
パルプ配合を、TMP70部、LBKP30部とした以外は、実施例1と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は100秒であった。
[実施例4]
パルプ配合を、TMP10部、RGP(CSF70ml)10部、NBKP(CSF470ml)5部、LBKP75部とした以外は、実施例1と同様にして感熱記録体を得た。この紙支持体の感熱記録層を設ける面の点滴吸水度は155秒であった。
[実施例5]
パルプ配合を、TMP30部、RGP20部、NBKP5部、LBKP45部とした以外は、実施例1と同様にして感熱記録体を得た。この紙支持体の感熱記録層を設ける面の点滴吸水度は110秒であった。
支持体2を用いて、実施例1と同様にして感熱記録体を得た。
[実施例7]
パルプ配合を、TMP5部とCSF300mlの古紙パルプ(機械パルプの配合割合10%、以下同じ。)95部とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は90秒であった。
[実施例8]
カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.04g/m2(感熱記録層を設ける面の乾燥塗工量が0.02g/m2)とした以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は60秒であった。
[実施例9]
カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.08g/m2(感熱記録層を設ける面の乾燥塗工量が0.04g/m2)とした以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は150秒であった。
支持体原料中に、内添サイズ剤としてアルキルケテンダイマー(星光PMC社製AD1604、固形分30%)をパルプスラリーに対して固形分で対パルプ重量当たり0.15%となるように添加した以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は110秒であった。
[実施例11]
パルプ配合を、TMP20部、古紙パルプ80部とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は80秒であった。
[実施例12]
パルプ配合を、TMP40部、古紙パルプ60部とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は70秒であった。
[実施例13]
支持体の坪量を30g/m2とした以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は90秒であった。
[実施例14]
支持体の坪量を80g/m2とした以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は90秒であった。
パルプ配合を、LBKP10部、古紙パルプ90部とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は90秒であった。
[実施例16]
パルプ配合を、TMP60部、LBKP40部とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は50秒であった。
[実施例17]
クリヤーサイズ塗工液のカチオン性サイズ剤をアルキルケテンダイマー(日本PMC株式会社製SKレジンS-20)としたこと以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は90秒であった。
[実施例18]
支持体に、下塗り層を設けない以外は実施例6と同様に、感熱記録層用塗工液を塗工して、感熱記録体を得た。
パルプ配合をTMP10部、RGP(CSF70ml)10部、NBKP(CSF470ml)5部、LBKP75部とし、カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.4g/m2(感熱記録層を設ける面の乾燥塗工量が0.2g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は230秒であった。
[実施例20]
パルプ配合をTMP10部、RGP10部、NBKP5部、LBKP75部とし、カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.6g/m2(感熱記録層を設ける面の乾燥塗工量が0.3g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は340秒であった。
[実施例21]
パルプ配合をTMP10部、RGP10部、NBKP5部、LBKP75部とし、カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を1.0g/m2(感熱記録層を設ける面の乾燥塗工量が0.5g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は700秒であった。
パルプ配合をTMP10部、RGP10部、NBKP5部、LBKP75部とし、クリヤーサイズ塗工液のカチオン性サイズ剤に替えてアニオン性サイズ剤(スチレン-アクリル酸系共重合体樹脂のアニオン性ポリマー、荒川化学株式会社製 PM1343)を使用、アニオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.15g/m2(感熱記録層を設ける面の乾燥塗工量が0.075g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は70秒であった。
[実施例23]
パルプ配合をTMP10部、RGP10部、NBKP5部、LBKP75部とし、クリヤーサイズ塗工液のカチオン性サイズ剤に替えてアニオン性サイズ剤(スチレン-アクリル酸系共重合体樹脂のアニオン性ポリマー、荒川化学株式会社製 PM1343)を使用、アニオン性サイズ剤の支持体両面を合わせた乾燥塗工量を1.0g/m2(感熱記録層を設ける面の乾燥塗工量が0.5g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は450秒であった。
[実施例24]
パルプ配合をTMP10部、RGP10部、NBKP5部、LBKP75部とし、クリヤーサイズ塗工液のカチオン性サイズ剤に替えてノニオン性合成サイズ剤(ノニオン性の合成オリゴマー、荒川化学株式会社製 WSA40)を使用、ノニオン性合成サイズ剤の支持体両面を合わせた乾燥塗工量を0.8g/m2(感熱記録層を設ける面の乾燥塗工量が0.4g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は50秒であった。
パルプ配合を、LBKP100部とした以外は、実施例1と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は190秒であった。
[比較例2]
パルプ配合を、LBKP100部として、パルプスラリーに対して、嵩高剤(花王株式会社製KB115、多価アルコールと飽和脂肪酸のエステル体)を対パルプ重量当たり0.5%となるように添加した以外は、実施例1と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は160秒であった。
[比較例3]
嵩向上の為、LBKP製造時のリファイナーの強度を変更し、フリーネス(CSF)が570mlのLBKPを用いた以外は、比較例1と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は140秒であった。
カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.02g/m2(感熱記録層を設ける面の乾燥塗工量が0.01g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は30秒であった。
[比較例5]
パルプ配合をLBKP100部として、パルプスラリーに対して、嵩高剤(花王株式会社製KB115、多価アルコールと飽和脂肪酸のエステル体)を対パルプ重量当たり0.5%となるように添加した以外は、比較例4と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は10秒であった。
[比較例6]
嵩向上の為、LBKP製造時のリファイナーの強度を変更し、CSF570mlのLBKPを用いてパルプ配合をLBKP100部とした以外は、比較例4と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は10秒であった。
[比較例7]
カチオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.02g/m2(感熱記録層を設ける面の乾燥塗工量が0.01g/m2)とした以外は、実施例7と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は10秒であった。
パルプ配合をTMP10部、RGP(CSF70ml)10部、NBKP(CSF470ml)5部、LBKP75部とし、クリヤーサイズ塗工液のカチオン性サイズ剤に替えてアニオン性サイズ剤(スチレン-アクリル酸系共重合体樹脂のアニオン性ポリマー、荒川化学株式会社製 PM1343)を使用、アニオン性サイズ剤の支持体両面を合わせた乾燥塗工量を0.06g/m2(感熱記録層を設ける面の乾燥塗工量が0.03g/m2)とした以外は、実施例6と同様にして感熱記録体を得た。紙支持体の感熱記録層を設ける面の点滴吸水度は20秒であった。
[印字濃度]
感熱記録体に、大倉電機社製のTH-PMDを使用して、印加エネルギー0.35mJ/dotで印字を行ない、印字後の印字濃度をマクベス濃度計(RD-914、アンバーフィルター使用)で測定した。
[再印字性](保存後の印字濃度)
40℃、90%RHの環境下で感熱記録体を24時間保存した。保存後の感熱記録体に、大倉電機社製のTH-PMDを使用して、印加エネルギー0.35mJ/dotで印字を行ない、印字濃度をマクベス濃度計(RD-914、アンバーフィルター使用)で測定した。
作製した感熱記録体の感熱記録面と反対の面に、RI印刷機を用いてオフセット輪転印刷用インキ(墨)を印刷し乾燥させた後、感熱記録面にゼブラ社製ラベルプリンタ140XiIIIにてバーコード印字(CODE39)した後、印字されたバーコードをバーコードリーダー(日本システックス社製、Quick Check PC600)にて評価した。評価はANSIグレード(CEN法、測定回数10回の平均)にて行った。
評価値が1.5以上であれば、バーコード読取性において実用上問題ないレベルであり、一方、評価値が1.5未満であると、バーコード読取性において実用上問題が発生する。
作製した感熱記録体の感熱記録面と反対の面に、ローランド社製オフセット枚葉印刷機(2色)にてオフセット枚葉用インキ(東洋インキ社製 ハイユニティーM)を用いて印刷した後に、藍単色ベタ部の紙剥け(インキのタック(粘着性)により支持体表層が引き剥がされること)を目視で評価した。
優:紙剥けが全く見られない
良:紙剥けがほとんど見られない
可:紙剥けが若干見られるが、実用上支障がない程度である
不可:紙剥けが多い、もしくは支持体の内部まで破壊される
Claims (9)
- 支持体上に、無色ないし淡色の電子供与性ロイコ染料及び電子受容性顕色剤を含有する感熱記録層を設けた感熱記録体であって、該支持体が機械パルプを5重量%以上含有するパルプから成り、該支持体の感熱記録層を設ける面の点滴吸水度(滴下水の量を0.001mlとする以外は、紙パルプ技術協会 J.TAPPI No.32-2:2000に規定される点滴吸水度に準じる。)が50秒以上である感熱記録体。
- 前記点滴吸水度が、前記支持体である測定用試験片(紙)を水平に張り、感熱記録層を設ける面に、蒸留水1μl(0.001ml)を滴下したときの、目視観察で水滴が吸収されるまでの時間で表わされる請求項1に記載の感熱記録体。
- 前記支持体の感熱記録層を設ける面の点滴吸水度が300秒以下である請求項1又は2に記載の感熱記録体。
- 前記支持体が機械パルプを10~50重量%含有するパルプから成る請求項1~3のいずれか一項に記載の記載の感熱記録体。
- 前記機械パルプがTMP(サーモメカニカルパルプ)である請求項1~4のいずれか一項に記載の感熱記録体。
- 前記支持体が、抄造工程でサイズ剤を内添したものであり、該サイズ剤がアルキルケテンダイマー(AKD)である請求項1~5のいずれか一項に記載の感熱記録体。
- 前記支持体が、抄造後その少なくとも一面にサイズ剤を塗工されたものであり、該サイズ剤がスチレン-アクリル酸系共重合体樹脂のカチオン性ポリマー又はアルキルケテンダイマー(AKD)である請求項1~5のいずれか一項に記載の感熱記録体。
- 前記支持体の坪量が35~100g/m2である請求項1~7のいずれか一項に記載の感熱記録体。
- 前記支持体と前記感熱記録層との間にバインダーと顔料とから成る下塗り層を設け、その塗工量が15g/m2以下である請求項1~8のいずれか一項に記載の感熱記録体。
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US8247347B2 (en) | 2007-03-29 | 2012-08-21 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US8283284B2 (en) | 2007-05-10 | 2012-10-09 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US8466085B2 (en) | 2007-08-29 | 2013-06-18 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US8492308B2 (en) | 2007-08-21 | 2013-07-23 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US8609582B2 (en) | 2009-03-24 | 2013-12-17 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
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US8673812B2 (en) | 2009-06-05 | 2014-03-18 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US8871678B2 (en) | 2010-03-15 | 2014-10-28 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
US9579916B2 (en) | 2013-09-30 | 2017-02-28 | Nippon Paper Industries Co., Ltd. | Thermosensitive recording medium |
Also Published As
Publication number | Publication date |
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TW201103772A (en) | 2011-02-01 |
TWI401163B (zh) | 2013-07-11 |
KR101367871B1 (ko) | 2014-02-27 |
CN102802960A (zh) | 2012-11-28 |
US8673812B2 (en) | 2014-03-18 |
KR20120023696A (ko) | 2012-03-13 |
US20120129692A1 (en) | 2012-05-24 |
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