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
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
• • 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
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
  • B41M5/3333—Non-macromolecular compounds
• • 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
• • 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
• • 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
• • 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
  • B41M5/323—Organic colour formers, e.g. leuco dyes
  • B41M5/327—Organic colour formers, e.g. leuco dyes with a lactone or lactam ring
  • B41M5/3275—Fluoran compounds
• • 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

Definitions

• the present invention utilizes a color-forming reaction between a colorless or light-colored electron-donating leuco dye (hereinafter also referred to as “leuco dye”) and an electron-accepting developer (hereinafter also referred to as "developer”).
• leuco dye colorless or light-colored electron-donating leuco dye
• developer electron-accepting developer
• the present invention relates to a thermosensitive recording medium which is excellent in high-speed printability, oil resistance, plasticizer resistance, print runnability and the like.
• thermosensitive recording media are obtained by coating a coating liquid containing a colorless or light-colored leuco dye and a developer on a support such as paper, synthetic paper, film, plastic, etc., and thermal head, hot A recorded image is obtained by an instantaneous chemical reaction caused by heating with a stamp, hot pen, laser beam, or the like.
• Thermal recording media are widely used as recording media such as facsimiles, computer terminal printers, automatic ticket vending machines, measuring recorders, and receipts from supermarkets and convenience stores. In recent years, thermal recording media have been used in various applications such as various tickets, receipts, labels, bank ATMs, gas and electricity meter reading, and cash vouchers such as horse racing tickets.
• thermosensitive recording material improved in water resistance, plasticizer resistance in the image area, heat resistance in the blank area, oil resistance, storage stability in the image area and blank area under severe conditions, and various other properties are required.
• a thermosensitive recording material improved in water resistance, plasticizer resistance in the image area, heat resistance in the blank area, etc., by using a combination of two specific color developers (Patent Document 1) and a urea compound as a color developer for improving required performance such as color density, whiteness, and storability of printed portions of a thermal recording medium (Patent Documents 2 and 3).
• Patent Documents 4 As a method for improving the sensitivity and print quality of a thermosensitive recording medium, it has been proposed to provide an undercoat layer containing hollow particles between the support and the thermosensitive recording layer (Patent Documents 4, 5, etc.).
• an object of the present invention is to provide a thermal recording medium which is excellent in high-speed printability among the various performances required of the thermal recording medium, and which is further excellent in oil resistance, plasticizer resistance, print runnability, and the like.
• the present inventors have found that a heat-sensitive recording layer provided on a support contains a specific urea compound as a color developer, and an undercoat layer is provided between the support and the heat-sensitive recording layer.
• the inventors have found that the above problems can be solved by incorporating a specific amount of plastic hollow particles in the undercoat layer, and have completed the present invention. That is, the present invention provides a heat-sensitive recording material comprising an undercoat layer provided on a support, and a heat-sensitive recording layer containing a colorless or light-colored electron-donating leuco dye and an electron-accepting color developer provided on the undercoat layer.
• the heat-sensitive recording layer contains a urea compound represented by the following general formula (Chemical Formula 1) as an electron-accepting color developer, and the undercoat layer contains 50 to 95% by weight of a pigment in solid content.
• X represents —O— or —NH—
• R 1 represents a hydrogen atom or —SO 2 —R 3
• R 3 represents a substituted or unsubstituted alkyl group, aralkyl group or aryl group
• R 2 represents a hydrogen atom or an alkyl group
• m represents an integer of 0 to 2
• n represents 0 or 1.
• thermo recording medium which has good high-speed printability while having color development performance, and furthermore, provides a thermal recording medium which has good oil resistance, plasticizer resistance, print runnability, and the like. can provide.
• the heat-sensitive recording material of the present invention has a heat-sensitive recording layer on a support and an undercoat layer between the support layer and the heat-sensitive recording layer. Containing a urea compound, the undercoat layer contains a specific amount of plastic hollow particles.
• Various materials used in the heat-sensitive recording layer of the heat-sensitive recording medium of the present invention are exemplified below. It can also be used for each coating layer provided.
• the heat-sensitive recording layer contains at least one urea compound represented by the general formula (1) as a color developer.
• R 3 is preferably a substituted or unsubstituted aryl group, more preferably a group represented by the following formula.
• R 4 to R 8 may be the same or different, and are hydrogen atom, halogen atom, nitro group, amino group, alkyl group, alkoxy group, aryloxy group, alkylcarbonyloxy group, aryl represents a carbonyloxy group, an alkylcarbonylamino group, an arylcarbonylamino group, an alkylsulfonylamino group, an arylsulfonylamino group, a monoalkylamino group, a dialkylamino group, or an arylamino group.
• This urea compound is preferably selected from the following (1) to (3).
• (3) a third urea compound represented by the following formula (Chem. 4) In the formula, R 2 is defined as above, and R 4 to R 8 are described later.)
• the urea compounds used in the present invention are more preferably at least two selected from the urea compounds represented by (1) to (3) above.
• two or more urea compounds are not selected from each of (1), (2) and (3). That is, the at least two urea compounds are a combination of a first urea compound and a second urea compound, a combination of a first urea compound and a third urea compound, a combination of a second urea compound and a third urea compound, and (1 ) to (3) are combined use of the first to third urea compounds.
• the first urea compound used in the present invention is represented by the following formula (2), preferably represented by the following formula (5).
• R 1 represents a hydrogen atom or --SO 2 --R 3 and n represents 0 or 1, preferably 1.
• R 3 represents an optionally substituted or unsubstituted alkyl group, aralkyl group or aryl group.
• This alkyl group is, for example, a linear, branched or alicyclic alkyl group, and preferably has 1 to 12 carbon atoms.
• the aralkyl group preferably has 7 to 12 carbon atoms, and the aryl group preferably has 6 to 12 carbon atoms.
• the substituent is preferably an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a halogen atom.
• a plurality of R 3 may be the same or different.
• the positions of R 1 —O— in the benzene ring of general formula (2) may be the same or different, and are preferably 3-, 4- or 5-position.
• the position of R 3 —SO 2 —O— in the benzene ring of general formula (2) and general formula (5) may be the same or different, preferably 3-position, 4-position or 5-position. rank.
• alkyl group examples include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, t-butyl group, cyclopentyl group, hexyl group, cyclohexyl group and 2-ethyl group.
• the aralkyl group includes a benzyl group, 1-phenylethyl group, 2-phenylethyl group, 3-phenylpropyl group, p-methylbenzyl group, m-methylbenzyl group, m-ethylbenzyl group and p-ethylbenzyl group.
• the aryl group includes a phenyl group, p-tolyl group, m-tolyl group, o-tolyl group, 2,5-dimethylphenyl group, 2,4-dimethylphenyl group, 3,5-dimethylphenyl group, 2, 3-dimethylphenyl group, 3,4-dimethylphenyl group, mesitylene group, p-ethylphenyl group, pi-propylphenyl group, pt-butylphenyl group, p-methoxyphenyl group, 3,4-dimethoxy phenyl group, p-ethoxyphenyl group, p-chlorophenyl group, 1-naphthyl group, 2-naphthyl group, t-butylated naphthyl group, or an alkyl group, alkoxy group, aralkyl group, aryl group, or halogen atom;
• a substituted aryl group and the like
• R 2 represents a hydrogen atom or an alkyl group, preferably a hydrogen atom, and the alkyl group is preferably an alkyl group having 1 to 4 carbon atoms, such as methyl group, ethyl group, propyl group, isopropyl group, butyl group. , isobutyl group, sec-butyl group, t-butyl group and the like.
• the position of R 2 in the benzene ring of the general formula (2) may be the same or different, preferably 3-position, 4-position or 5-position.
• a urea compound represented by the following general formula (Formula 6) is more preferable as the first urea compound of the present invention.
• R 9 is an alkyl group or an alkoxy group, preferably an alkyl group, and o represents an integer of 0-3, preferably 0-2, more preferably 0-1.
• the number of carbon atoms in this alkyl group is, for example, 1-12, preferably 1-8, more preferably 1-4.
• the position of R 9 in the benzene ring of formula (6) may be the same or different, preferably 3-position, 4-position or 5-position, preferably 4-position.
• the first urea compound of the present invention for example, N,N'-di-[3-(benzenesulfonyloxy)phenyl]urea, N,N'-di-[3-(benzenesulfonyloxy)-4 -methyl-phenyl]urea, N,N'-di-[3-(benzenesulfonyloxy)-4-ethyl-phenyl]urea, N,N'-di-[3-(benzenesulfonyloxy)-5-methyl -phenyl]urea, N,N'-di-[3-(benzenesulfonyloxy)-4-propyl-phenyl]urea, N,N'-di-[3-(o-toluenesulfonyloxy)phenyl]urea, N,N'-di-[3-(m-toluenesulfonyloxy)phenyl]
• the second urea compound used in the present invention is represented by the following formula (chemical formula 3).
• R 2 , R 4 to R 8 are defined as above.
• R 4 to R 8 are preferably a hydrogen atom, an alkyl group or an alkoxy group.
• R 4 , R 5 , R 7 and R 8 are preferably hydrogen atoms
• R 6 is preferably hydrogen atoms or alkyl groups.
• R6 is particularly preferably an alkyl group.
• This alkyl group (including those included in alkylcarbonyloxy groups, alkylcarbonylamino groups, alkylsulfonylamino groups, monoalkylamino groups, and dialkylamino groups), and aryl groups (aryloxy groups, arylcarbonyloxy groups, aryl carbonylamino group, arylsulfonylamino group, and arylamino group) are defined in the same manner as the alkyl group and aryl group in the general formula (2).
• This alkoxy group is, for example, a linear, branched or alicyclic alkoxy group, and preferably has 1 to 12 carbon atoms.
• the position of the —O—(CONH) m —SO 2 -substituted phenyl group in the benzene ring of the general formula (3) is preferably the 3-, 4- or 5-position (the following general formula (7) and general formula (Formula 8).).
• m represents an integer of 0-2, preferably 0-1.
• a urea compound represented by the following general formula (Chem. 7) or the following general formula (Chem. 8) is preferable.
• the third urea compound used in the present invention is represented by the following formula (Formula 4).
• R 2 and R 4 to R 8 are defined as above.
• N-[2-(3-phenylureido)phenyl]benzenesulfonamide is preferable, and this compound is represented by the following formula, and is available from Nippon Soda Co., Ltd. under the trade name NKK1304, for example. is.
• the content of the urea compound in the thermosensitive recording layer of the present invention (solid content, total amount when multiple urea compounds are included) is 1.0 to 70.0% by weight, preferably 5.0 to 65.0% by weight, More preferably 10.0 to 60.0 parts by weight.
• the content of the first urea compound in the thermosensitive recording layer of the invention is 1.0 to 50.0% by weight, preferably 5.0 to 40.0% by weight.
• the content of the second urea compound is 5.0 to 50.0% by weight, preferably 5.0 to 40.0% by weight.
• the content of the third urea compound is 5.0 to 50.0% by weight, preferably 5.0 to 40.0% by weight.
• the content of the second urea compound in the heat-sensitive recording layer is 1.0 parts by weight of the first urea compound. , preferably 0.1 to 30.0 parts by weight, more preferably 0.5 to 25.0 parts by weight, still more preferably 1.0 to 20.0 parts by weight, particularly preferably 2.0 to 15.0 parts by weight Department. Further, when the heat-sensitive recording layer of the present invention contains the first and third urea compounds, the content of the third urea compound in the heat-sensitive recording layer is 1.0 parts by weight of the first urea compound.
• the content of the third urea compound in the heat-sensitive recording layer is 1.0 parts by weight of the second urea compound.
• 0.1 to 30.0 parts by weight more preferably 0.3 to 25.0 parts by weight, still more preferably 0.5 to 20.0 parts by weight, and particularly preferably 0.7 to 15.0 parts by weight. 0 parts by weight.
• the heat-sensitive recording layer of the present invention may use a color developer other than the first to third compounds.
• Acidic substances 4,4'-isopropylidenediphenol, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 4,4'-dihydroxydiphenyl sulfide, hydroquinone monobenzyl ether, benzyl 4-hydroxybenzoate, 4,4'-dihydroxydiphenylsulfone, 2,4'-dihydroxydiphenylsulfone, 4-hydroxy-4'-isopropoxydiphenylsulfone, 4-hydroxy-4' -n-propoxydiphenylsulfone, bis(3-allyl-4-hydroxyphenyl)sulfone, 4-hydroxy-4'-methyldiphenylsulfone, 4-hydroxyphenyl-4'-benzyloxyphenylsulfone, 3,4-dihydroxyphenyl -4'-methyl
• color developers can be used alone or in combination of two or more.
• 1-[4-(4-hydroxyphenylsulfonyl)phenoxy]-4-[4-(4-isopropoxyphenylsulfonyl)phenoxy]butane is available, for example, from API Corporation under the trade name JKY-214.
• the phenol condensation composition described in Japanese Patent Application Laid-Open No. 2003-154760 is available, for example, under the trade name JKY-224 manufactured by API Corporation.
• Compounds described in WO02/081229 and the like are available under the trade names NKK-395 and D-100 manufactured by Nippon Soda Co., Ltd.
• metal chelate-type coloring components such as higher fatty acid metal double salts and polyhydric hydroxyaromatic compounds described in JP-A-10-258577 can also be contained.
• the total content (solid content) of the first to third urea compounds used is preferably 50% by weight or more, more preferably 80% by weight or more, and still more preferably 90% by weight or more.
• leuco dyes used in the present invention all those known in the field of conventional pressure-sensitive or heat-sensitive recording papers can be used, and they are not particularly limited, but triphenylmethane-based compounds, fluoran-based compounds, fluorene -based compounds, divinyl-based compounds and the like are preferred. Specific examples of representative colorless to light-colored dyes (dye precursors) are shown below. These dye precursors may be used alone or in combination of two or more.
• ⁇ Fluorene-based leuco dye > 3,6,6'-tris(dimethylamino)spiro[fluorene-9,3'-phthalide], 3,6,6'-tris(diethylamino)spiro[fluorene-9,3'-phthalide]
• sensitizers can be used as the sensitizer used in the present invention.
• sensitizers include fatty acid amides such as stearamide and palmitic acid amide, ethylenebisamide, montanic acid wax, polyethylene wax, 1,2-bis-(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, 1-hydroxy-2-naphthoic acid
• Pigments used in the present invention include kaolin, calcined kaolin, calcium carbonate, aluminum oxide, titanium oxide, magnesium carbonate, aluminum silicate, magnesium silicate, calcium silicate, aluminum hydroxide, silica and the like. They can also be used in combination.
• Binders used in the present invention include 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 polyvinyl alcohol.
• Lubricants 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-t-butyl-3-methylphenol), 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 and the like can also be added.
• benzophenone-based or triazole-based UV absorbers, dispersants, antifoaming agents, antioxidants, fluorescent dyes, and the like can be used.
• the types and amounts of leuco dyes, color developers, sensitizers, and other various components used in the thermosensitive recording layer of the present invention are determined according to the required performance and recording suitability, and are not particularly limited. Normally, 0.5 to 10 parts by weight of developer, 0.1 to 10 parts by weight of sensitizer, 0.5 to 20 parts by weight of pigment, and 0.01 to 10 parts by weight of stabilizer per 1 part by weight of leuco dye. parts, and about 0.01 to 10 parts by weight of other components. About 5 to 25% by weight of the binder in the solid content of the thermosensitive recording layer is suitable.
• the leuco dye, color developer, and optionally added materials are pulverized to a particle diameter of several microns or less by a pulverizer such as a ball mill, attritor, sand grinder, or an appropriate emulsifying device, and then mixed with a binder.
• a pulverizer such as a ball mill, attritor, sand grinder, or an appropriate emulsifying device
• various additive materials are added to prepare a coating liquid. Water, alcohol, or the like can be used as a solvent for this coating liquid, and the solid content thereof is about 20 to 40% by weight.
• the heat-sensitive recording material of the present invention is provided with an undercoat layer between the support and the heat-sensitive recording layer.
• This undercoat layer consists mainly of a binder and a pigment.
• the binder used for the undercoat layer the above binders usable for the heat-sensitive recording layer can be appropriately used. One or more of these binders may be used.
• the pigment used in the undercoat layer contains plastic hollow particles.
• the plastic hollow particles used in the present invention are fine hollow particles which have a shell made of a thermoplastic resin and contain air or other gases inside, and are already in an expanded state.
• thermoplastic resins include polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyacrylate, polyacrylonitrile, polybutadiene, or copolymers thereof.
• Particularly preferred are styrene resins such as polystyrene, acrylic resins such as polyacrylate and polyacrylonitrile, copolymers thereof, and copolymer resins mainly composed of polyvinylidene chloride and polyacrylonitrile.
• Such organic hollow particles are available as SX8782 manufactured by JSR, MH5055 and MH8108A manufactured by Nippon Zeon, Ropaik HP-91 manufactured by Rohm & Haas Japan, and Microsphere manufactured by Matsumoto Yushi.
• the volume hollowness of the plastic hollow particles used in the present invention is preferably about 40 to 95%. By setting the volume hollowness to 40% or more, it is possible to improve the heat insulating property and to further improve the coloring performance. On the other hand, when the content is 95% or less, the shell strength of the hollow particles is increased, the hollow state is effectively maintained, and it becomes easy to obtain an undercoat layer with good surface strength.
• the volumetric hollowness is a value obtained by (d3/D3) ⁇ 100. In the formula, d represents the inner diameter of the organic hollow particles, and D represents the outer diameter of the organic hollow particles.
• the undercoat layer may contain pigments other than plastic hollow particles, such as calcium carbonate, silica, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, kaolin, calcined kaolin, clay, inorganic pigments such as talc, Organic pigments such as plastic hollow particles can be used. One or more of these pigments may be used. Calcined kaolin is preferably used as a pigment other than plastic hollow particles.
• the pigment content in the undercoat layer is generally 50 to 95% by weight, preferably 70 to 90% by weight, based on the solid content of the undercoat layer.
• the content of the plastic hollow particles in the undercoat layer is 50% by weight or more, preferably 70 to 100% by weight, more preferably 80 to 100% by weight, based on the pigment (solid content) in the undercoat layer.
• auxiliary agents such as dispersants, plasticizers, pH adjusters, antifoaming agents, water retention agents, preservatives, coloring dyes, and UV inhibitors may be appropriately added to the coating solution for the undercoat layer, if necessary. good.
• the heat-sensitive recording material of the present invention may further have a protective layer on the heat-sensitive recording layer.
• This protective layer consists mainly of a binder and a pigment, to which a cross-linking agent may be added.
• this binder the above-described binders usable in the heat-sensitive recording layer can be appropriately used, but carboxy-modified polyvinyl alcohol and non-core-shell type acrylic resins having a glass transition point (Tg) higher than 50° C. are preferred. One or more of these binders may be used.
• cross-linking agent examples include epichlorohydrin-based resins such as polyamine epichlorohydrin resins and polyamide epichlorohydrin resins, polyamide-urea-based resins, polyalkylenepolyamine resins, polyalkylene-polyamide resins, polyamine-polyurea-based resins, modified Polyamine resins, modified polyamide resins, polyalkylenepolyamine urea formalin resins, or polyamine/polyamide resins such as polyalkylenepolyamine polyamide polyurea resins, glyoxal, methylol melamine, melamine formaldehyde resins, melamine urea resins, potassium persulfate, ammonium persulfate, Examples include sodium persulfate, ferric chloride, magnesium chloride, borax, boric acid, alum, and ammonium chloride.
• the amount of the binder or the total amount of the binder and the pigment in the protective layer is usually 80.0 to 100.0% by weight, preferably 90.0 to 100.0% by weight, based on 100 parts by weight of the pigment. It is preferable that the binder is about 30.0 to 300.0 parts by weight.
• the coating solution for the protective layer may contain various additives such as lubricants, stabilizers, ultraviolet absorbers, dispersants, antifoaming agents, antioxidants, fluorescent dyes, etc. You may mix
• means for coating the heat-sensitive recording layer and coating layers other than the heat-sensitive recording layer are not particularly limited, and can be applied according to well-known and commonly used techniques.
• an off-machine coating machine or an on-machine coating machine equipped with various coaters such as air knife coater, rod blade coater, bent blade coater, bevel blade coater, roll coater and curtain coater are appropriately selected and used.
• the coating amount of the heat-sensitive recording layer and the coating layers other than the heat-sensitive recording layer is determined according to the required performance and recording suitability, and is not particularly limited.
• the coating amount of the protective layer is preferably 0.5 to 5.0 g/ m 2 in terms of solid content.
• various known techniques in the field of thermosensitive recording materials such as performing smoothing treatment such as supercalendering after coating each coating layer, can be added as necessary.
• each dispersion liquid and coating liquid were prepared as follows for the production of a thermal recording medium.
• coating solutions 1 to 4 for undercoat layers were prepared.
• ⁇ Coating solution 1 for undercoat layer Calcined kaolin (manufactured by BASF, trade name: Ansilex 90) 40.0 parts Plastic hollow particles (manufactured by Nippon Zeon, trade name: Nipol MH8108A, hollow rate 50%, solid content 27%) 222.2 parts Styrene-butadiene copolymer latex (Nippon Zeon Co., Ltd., Product name: ST5526, solid content 48%) 10.0 parts
• Color developer dispersions Liquids A1 to 5
• leuco dye dispersion Liquid B
• sensitizer dispersion Liquid C
• urea compound 1 N,N'-di-[3-(p-toluenesulfonyloxy)phenyl]urea (hereinafter referred to as "urea compound 1") 6.0 parts Fully saponified polyvinyl alcohol aqueous solution (manufactured by Kuraray Co., Ltd., trade name: PVA117, solid content 10%) 5.0 parts water 1.5 parts
• urea compound 2 A urea compound represented by the following chemical formula (9) (hereinafter referred to as "urea compound 2") 6.0 parts Fully saponified polyvinyl alcohol aqueous solution (PVA117) 5.0 parts Water 1.5 parts Color developer dispersion (A3 liquid) N-[2-(3-phenylureido)phenyl]benzenesulfonamide (hereinafter referred to as "urea compound 3”) 6.0 parts Fully saponified polyvinyl alcohol aqueous solution (PVA117) 5.0 parts Water 1.5 parts
• Color developer dispersion A5 liquid
• 4-Hydroxy-4'-isopropoxydiphenylsulfone manufactured by Mitsubishi Chemical Corporation, trade name: NYDS
• Fully saponified polyvinyl alcohol aqueous solution PVA117
• Leuco dye dispersion Liquid B 3-dibutylamino-6-methyl-7-anilinofluorane (manufactured by Yamamoto Kasei Co., Ltd., trade name: ODB-2) 6.0 parts Fully saponified polyvinyl alcohol aqueous solution (PVA117) 5.0 parts Water 1.5 Department
• Sensitizer dispersion Liquid C
• KS232 1,2-bis-(3-methylphenoxy)ethane (manufactured by Sanko Co., Ltd., Product name: KS232) 6.0 parts
• Fully saponified polyvinyl alcohol aqueous solution PVA117
• each dispersion liquid was mixed in the following proportions to prepare a coating liquid for a heat-sensitive recording layer.
• ⁇ Coating liquid for thermosensitive recording layer Color developer dispersion (Liquid A1) 36.0 parts Leuco dye dispersion (Liquid B) 18.0 parts Sensitizer dispersion (Liquid C) 5.0 parts Fully saponified polyvinyl alcohol aqueous solution (PVA117) 25. 0 copies
• a protective layer coating solution was prepared by mixing the formulations having the following proportions.
• Aluminum hydroxide dispersion manufactured by Martinsberg, Product name: Martin Fin OL, solid content 50%
• Carboxy-modified polyvinyl alcohol aqueous solution manufactured by Kuraray, product name: KL318, degree of polymerization: about 1800, degree of saponification: 85-90 mol%, Solid content 10%
• Polyamide epichlorohydrin resin manufactured by Seiko PMC, trade name: WS4030, solid content 25%
• Modified polyamine resin manufactured by Taoka Chemical Co., trade name: Sumilase Resin SPI -102A, solid content 45%
• Zinc stearate manufactured by Chukyo Yushi Co., Ltd., trade name: Hydrin Z-7-30, Solid content 30%
• Example 1 After coating one side of a support (wooden paper with a basis weight of 47 g/m 2 ) with the coating liquid 1 for the undercoat layer by a bent blade method so that the solid content coating amount is 10.0 g/m 2 . , and drying to obtain an undercoat layer-coated paper.
• the thermosensitive recording layer coating solution On the undercoat layer of the undercoat layer-coated paper, the thermosensitive recording layer coating solution is coated by a rod blade method so that the solid content coating amount is 6.0 g/m 2 , and then dried.
• a heat-sensitive recording material was prepared by processing with a super calender so that the smoothness became 100 to 500 seconds.
• Example 2 Undercoat layer coating solution 3 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 18 parts of A4 liquid was added to the liquid.
• Example 3 The procedure of Example 1 was repeated except that the undercoat layer coating solution 3 was used instead of the undercoat layer coating solution 1, and the A2 solution was used instead of the A1 solution in the thermosensitive recording layer coating solution. A heat-sensitive recording material was produced.
• Example 4 The procedure was the same as in Example 1, except that the undercoat layer coating solution 3 was used instead of the undercoat layer coating solution 1, and the A3 solution was used instead of the A1 solution in the thermosensitive recording layer coating solution. A heat-sensitive recording material was produced.
• Example 5 Undercoat layer coating solution 4 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 18 parts of A2 liquid was added to the liquid.
• Undercoat layer coating solution 2 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 18 parts of A3 liquid was added to the liquid.
• Undercoat layer coating solution 3 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 18 parts of A3 liquid was added to the liquid.
• thermosensitive recording layer coating solution 5 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 18 parts of A3 liquid was added to the liquid.
• the protective layer coating solution is coated by a rod blade method so that the coating amount in solid content is 2.0 g/m 2 , and then dried.
• a thermal recording material was prepared in the same manner as in Example 8, except that the surface was treated with a supercalender so that the smoothness was 100 to 500 seconds.
• Example 10 Undercoat layer coating solution 3 was used in place of undercoat layer coating solution 1, and the blending amount of solution A1 in the thermosensitive recording layer coating solution was changed to 18 parts.
• a thermal recording material was produced in the same manner as in Example 1, except that 9 parts of A3 liquid and 9 parts of A4 liquid were added to the liquids.
• Example 11 instead of the undercoat layer coating solution 1, the undercoat layer coating solution 3 was used, the A1 solution in the thermosensitive recording layer coating solution was not blended, and 18 parts of the A2 solution and 18 parts of the A3 solution were added.
• a thermal recording material was produced in the same manner as in Example 1 except for the above.
• a heat-sensitive recording material was prepared in the same manner as in Example 1, except that the undercoat layer coating solution 1 was changed to the undercoat layer coating solution 6.
• a thermal recording material was prepared in the same manner as in Example 3, except that the undercoat layer was not provided.
• a thermal recording material was prepared in the same manner as in Example 3, except that the undercoat layer coating solution 3 was changed to the undercoat layer coating solution 8.
• a heat-sensitive recording material was prepared in the same manner as in Example 4, except that the undercoat layer coating solution 3 was changed to the undercoat layer coating solution 6.
• a heat-sensitive recording material was prepared in the same manner as in Example 5, except that the undercoat layer coating solution 4 was changed to the undercoat layer coating solution 6.
• a heat-sensitive recording material was prepared in the same manner as in Example 5, except that no undercoat layer was provided.
• a heat-sensitive recording material was prepared in the same manner as in Example 5 except that the undercoat layer coating solution 4 was changed to the undercoat layer coating solution 8.
• a thermal recording material was prepared in the same manner as in Example 6, except that no undercoat layer was provided.
• a heat-sensitive recording material was prepared in the same manner as in Example 6, except that the undercoat layer coating solution 2 was changed to the undercoat layer coating solution 8.
• a thermal recording material was prepared in the same manner as in Example 11, except that no undercoat layer was provided.
• the following evaluations were performed on the produced thermal recording material.
• the prepared thermal recording material was checked using a TH-PMD (thermal recording paper printing tester manufactured by Okura Electric Co., Ltd., equipped with a thermal head manufactured by Kyocera) at a printing speed of 50 mm / sec and an applied energy of 0.41 mJ / dot. I printed the pattern.
• the print density of the printed portion was measured with a Macbeth densitometer (RD-914, using an amber filter) to evaluate the color development performance (print density).
• thermosensitive recording material For the prepared thermal recording material, using TH-PMD (thermal recording paper printing tester manufactured by Okura Electric Co., Ltd., equipped with a thermal head manufactured by Kyocera Corporation), applied energy 0.41 mJ / dot, printing speed 50 mm / sec Checkered pattern. was printed.
• the printed thermosensitive recording material was pasted on a paper tube wrapped once with PVC wrap (High Wrap KMA manufactured by Mitsui Chemicals), and further wrapped with PVC wrap three times on it, and subjected to environmental conditions of 40 ° C. for 24 hours. Let it stand for a while.
• Residual rate (%) (Print density of printed area after treatment/Print density of printed area before treatment) x 100 Excellent: Residual rate of 90% or more Fair: Residual rate of 70% or more and less than 90% Poor: Residual rate of less than 70% Grid printing of 10 cm in length was performed on the produced thermal recording medium by a label printer (Loane R-8) manufactured by Sato Co., Ltd. After printing, the scum adhering to the thermal head (head scum) was visually evaluated according to the following criteria. did.

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