WO2023276499A1 - 感熱記録材料 - Google Patents
感熱記録材料 Download PDFInfo
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- WO2023276499A1 WO2023276499A1 PCT/JP2022/021349 JP2022021349W WO2023276499A1 WO 2023276499 A1 WO2023276499 A1 WO 2023276499A1 JP 2022021349 W JP2022021349 W JP 2022021349W WO 2023276499 A1 WO2023276499 A1 WO 2023276499A1
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- Prior art keywords
- group
- recording material
- compounds
- heat
- sensitive recording
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—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
- B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
- B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—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
- B41M5/3331—Macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
- B41M5/337—Additives; Binders
- B41M5/3372—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/005—Lignin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/04—Direct thermal recording [DTR]
Definitions
- the present disclosure relates to thermal recording materials.
- biomass has been attracting attention as a sustainable renewable resource and energy source as long as living organisms and solar energy exist.
- biomass has been attracting attention as a sustainable renewable resource and energy source as long as living organisms and solar energy exist.
- biomass such as plants or plant-derived processed products, and techniques for converting petroleum-derived chemicals, resin products, and the like into biomass.
- forestry resources such as thinned wood, construction waste, paper mill waste, and other woody wastes are mostly disposed of except for being incinerated as fuel.
- effective utilization and recycling of these waste materials are being studied.
- lignin is contained at a ratio of about 30% of wood, and is said to be a natural organic compound that exists in the second largest amount after cellulose on the earth. Lignin is expected to be used industrially because it contains abundant aromatic rings and also has reactive functional groups such as hydroxyl groups.
- Patent Document 1 discloses a thermal recording material having a thermal recording layer and containing isolated lignin as an electron-accepting color developer.
- This isolated lignin is usually obtained by chemically modifying the lignin mentioned above.
- the isolated lignin includes lignosulfonic acid (salt), kraft lignin, soda lignin, soda-anthraquinone lignin, organosolv lignin, exploded lignin, sulfate lignin, and the like, depending on their chemical modification.
- kraft lignin contains abundant aromatic rings and has reactive groups such as hydroxyl groups, so it is suitable for developing coloring substances used in thermal recording materials. Therefore, it is expected to be applied to heat-sensitive recording materials as an environment-friendly color developer.
- An object of one aspect of the present invention is to provide a heat-sensitive recording material that uses kraft lignin as a color developer and does not give off an unpleasant odor when forming an image.
- the inventors of the present invention conducted intensive studies to solve the above problems, and found that dimethyl disulfide, among various components contained in kraft lignin, is the cause of the unpleasant odor felt during image formation. identified. Then, the present inventors purify kraft lignin by heating kraft lignin and water and azeotropically distilling dimethyl disulfide with water to reduce the content of dimethyl disulfide in kraft lignin to a specific concentration or less. By doing so, the inventors have found that the obtained heat-sensitive recording material can be less likely to emit an unpleasant odor when the image area is formed, and have completed the present invention based on this finding.
- one aspect of the present invention comprises a support and a thermosensitive coloring layer provided on the support, wherein the thermosensitive coloring layer contains (A) a coloring substance and (B) a dimethyl disulfide content of 2. .5 ppm or less of kraft lignin, and (C) at least one of the compounds of the following group (C-1), the compounds of the group (C-2) below, and the compounds of the group (C-3) below.
- An object of the present invention is to provide a heat-sensitive recording material comprising:
- Group (C-1) Compounds represented by the following general formula (I) having a sulfonylurea group (C-2)
- R 1 and R 2 represent a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and n1 and n2 are 0 represents an integer of up to 3, and when there are a plurality of R 1 and R 2 , R 1s or R 2s may be the same or different.
- X 1 and X 2 each independently represent -O- or -NH-
- R 3 represents a hydrogen atom or -SO 2 -R 4
- R 4 represents a substituted or unsubstituted alkyl group , an aralkyl group or an aryl group
- R 5 and R 6 each independently represent a hydrogen atom or an alkyl group
- n3 represents 0 or 1
- n4 represents an integer of 0 to 2
- R 3 may be the same or different.
- the ratio of the content of component (B) to the content of component (C) (component (B)/component (C)) in the thermosensitive coloring layer is 20/80 to 90 in mass ratio. /10.
- the heat-sensitive recording material may contain a compound represented by the following structural formula (III) as a color developer.
- the heat-sensitive recording material may contain one or more compounds represented by the following structural formulas (IV) to (VI) as a color developer.
- thermosensitive recording material that uses kraft lignin as a developer and does not give off an unpleasant odor when forming an image.
- the heat-sensitive recording material can form an image area that is excellent in preservability against alcohol and water.
- thermosensitive recording material comprises a support and a thermosensitive coloring layer provided on the support.
- the heat-sensitive recording material will be described in detail below.
- the support is not particularly limited, and for example, paper such as neutral paper and acid paper, recycled paper using waste paper pulp, synthetic paper, film, nonwoven fabric, and woven fabric can be used.
- the thermosensitive coloring layer comprises (A) a coloring substance (hereinafter also referred to as “component (A)”) and (B) kraft lignin having a dimethyl disulfide content of 2.5 ppm or less (hereinafter referred to as “component (B)”). and (C) at least one developer selected from the following group (C-1) compound, the following (C-2) group compound, and the following (C-3) group compound (hereinafter referred to as Also referred to as "(C) component").
- Group (C-1) Compounds represented by the following general formula (I) having a sulfonylurea group (C-2)
- R 1 and R 2 represent a halogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and n1 and n2 are 0 represents an integer of up to 3, and when there are a plurality of R 1 and R 2 , R 1s or R 2s may be the same or different.
- X 1 and X 2 each independently represent -O- or -NH-
- R 3 represents a hydrogen atom or -SO 2 -R 4
- R 4 represents a substituted or unsubstituted alkyl group , an aralkyl group or an aryl group
- R 5 and R 6 each independently represent a hydrogen atom or an alkyl group
- n3 represents 0 or 1
- n4 represents an integer of 0 to 2
- R 3 may be the same or different.
- a colorless or light-colored leuco dye can be used as the component (A) (color-developing substance).
- Leuco dyes include, for example, fluorane derivatives, quinazoline derivatives, phthalide derivatives, triphenylmethane derivatives and phenothiazine derivatives. These leuco dyes can be used singly or in combination of two or more.
- leuco dyes having a fluorane structure are particularly suitable for use because of their good color development.
- Leuco dyes having a fluoran structure include, for example, 3-isoamylethylamino-6-methyl-7-anilinofluorane, 3-(N-(4-methylphenyl)-N-ethyl)amino-6-methyl- 7-anilinofluorane, 3-diamylamino-6-methyl-7-anilinofluorane, 3-dibutylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilino Mention may be made of fluorane and 3-cyclohexylmethylamino-6-methyl-7-anilinofluorane.
- the content of the coloring substance in the thermosensitive coloring layer can be appropriately set according to the intended properties of the thermosensitive recording material.
- the content of the coloring substance may be, for example, 1 to 30% by mass, 5 to 20% by mass, or 8 to 18% by mass based on the total amount of the thermosensitive coloring layer. .
- Kraft lignin is isolated lignin obtained by treating lignin by the Kraft method.
- the Kraft method is a method of chemically modifying and separating lignin with sodium hydroxide (NaOH), sodium sulfide (Na 2 S) and the like.
- the dimethyl disulfide content is measured using a headspace gas chromatograph mass spectrometer.
- the content of dimethyl disulfide is preferably 2.5 ppm or less from the viewpoint of suppressing unpleasant odors during printing of the heat-sensitive recording material according to the present embodiment, and it is possible to further suppress unpleasant odors during printing. It is 0 ppm or less, more preferably 1.5 ppm or less. On the other hand, when the content of dimethyl disulfide exceeds 2.5 ppm, the heat-sensitive recording material obtained gives off an unpleasant odor when heat is applied during printing.
- the method for producing the kraft lignin used as the component (B) is not particularly limited as long as the content of dimethyl disulfide is 2.5 ppm or less.
- a method for example, commercially available kraft lignin is heated with water, and dimethyl disulfide is purified by azeotropic distillation with water, so that the content of dimethyl disulfide in kraft lignin is 2.5 ppm or less. be able to.
- R 1 and R 2 are preferably alkyl groups having 1 to 4 carbon atoms, because the heat-sensitive recording material to be obtained tends to further improve the color developability and storage stability of the image area.
- An alkyl group with number 1 or 2 is more preferred, and a methyl group is even more preferred.
- n1 and n2 are preferably 0-2. 0 or 1 is more preferred, and 1 is even more preferred. Within the above range, it is possible to obtain a heat-sensitive recording material which is more excellent in color developability and storability of image areas.
- the compounds of group (C-1) are compounds represented by the following structural formula (III) (wherein R 1 and R 2 are methyl groups, Compounds in which n1 and n2 are 1) are particularly preferred.
- the method for producing the (C-1) group compound is not particularly limited. Such a production method includes, for example, the method described in Japanese Patent Publication No. 2002-532441. A commercially available product may be used as the group (C-1) compound.
- Such commercial products include PF-201 manufactured by BASF (trade name, structural formula: above structural formula (III), compound name: N-[p-toluenesulfonyl]-N'-[3-p-toluene sulfonyloxyphenyl]urea) and the like.
- the (C-1) group compounds may be used singly or in combination of two or more.
- R 3 and R 4 are preferably alkyl groups having 1 to 4 carbon atoms and An alkyl group of 2 is more preferred, and a methyl group is even more preferred.
- n3 and n4 are preferably 0 to 2, more preferably 0 or 1, and even more preferably 0. Within the above range, it is possible to obtain a heat-sensitive recording material which is more excellent in color developability and storability of image areas.
- the (C-2) group compounds are preferably compounds represented by the following structural formulas (IV) to (VI) from the viewpoint of color development and image area storage stability.
- the method for producing the (C-2) group compound is not particularly limited. Examples of such a production method include the method described in International Publication No. 2014/080615. A commercially available product may be used as the group (C-2) compound.
- (C-2) Group compounds commercially available include NKK-1304 manufactured by Nippon Soda Co., Ltd. (trade name, structural formula: above structural formula (IV), compound name: N-(2-(3-phenylureido ) Phenyl)benzenesulfonamide), TG-MD manufactured by Nippon Kayaku Co., Ltd. (trade name, structural formula: above structural formula (V), presumed compound name: N-[4-[[(4-methylphenyl ) sulfonyl]oxy]phenyl]-N′-phenylurea).
- the (C-2) group compounds may be used singly or in combination of two or more.
- ((C-3) group compounds) 4,4'-dihydroxydiphenylsulfone, 2,4'-dihydroxydiphenylsulfone, bis(3-allyl-4-hydroxyphenyl)sulfone, 4-hydroxy-4'-isopropoxydiphenylsulfone, 4-hydroxy-4'-Allyloxydiphenylsulfone and 4-benzyloxy-4'-hydroxydiphenylsulfone are represented by the following structural formulas (VII) to (XII), respectively.
- a commercially available product may be used as the (C-3) group compound.
- Examples of such commercially available products include BP-S/FF-1 (trade name, structural formula: above structural formula (VII), compound name: 4,4'-dihydroxydiphenylsulfone), BPS-24C (trade name , structural formula: the above structural formula (VIII), compound name: 2,4′-dihydroxydiphenylsulfone), BPS-33AC (trade name, structural formula: structural formula (IX), compound name: bis(3-allyl-4 -hydroxyphenyl) sulfone), BPS-MAE (trade name, structural formula: above structural formula (XI), compound name: 4-hydroxy-4'-allyloxydiphenyl sulfone), BP-S/MA-3 (trade name , structural formula: the above structural formula (XII), compound name: 4-benzyloxy-4'-hydroxydiphenylsulfone) (both of which are manufactured by Nicca Chemical Co., Ltd.), and D-8 (trade name
- the (C-3) group compounds may be used singly or in combination of two or more.
- thermosensitive coloring layer (Color developer compounding amount in thermosensitive coloring layer)
- the total content of components (B) and (C) in the thermosensitive coloring layer should be 10 to 500 parts by weight per 100 parts by weight of the coloring substance, from the viewpoint of obtaining a thermosensitive recording material having sufficient coloring properties. , more preferably 50 to 400 parts by mass, even more preferably 100 to 300 parts by mass, and particularly preferably 140 to 210 parts by mass.
- the ratio of the content of component (B) to the content of component (C) in the thermosensitive coloring layer (component (B)/component (C)), in mass ratio, further improves the color development property and the storability of the image area. Therefore, 20/80 to 90/10 is preferred, 40/60 to 85/15 is more preferred, and 60/40 to 80/20 is even more preferred. Within the above range, it is possible to obtain a heat-sensitive recording material having sufficient color developability and excellent storability of image areas.
- the heat-sensitive coloring layer can further contain a color developer other than the components (B) and (C) within a range that does not impair the effects of the heat-sensitive recording material according to this embodiment.
- a color developer a conventionally known one can be used.
- color developers include, for example, JP-A-2020-520833, JP-A-2020-193153, JP-A-2006-104219, JP-A-8-059603, JP-A-10-029969. , JP-A-2008-303225, and JP-A-2007-302601.
- the thermosensitive coloring layer may further contain a sensitizer.
- the sensitizer is not particularly limited, but preferably has a melting point of 90 to 140°C.
- Such sensitizers include, for example, fatty acid amides such as stearic acid amide, ethers such as 1,2-bisphenoxyethane, 1,2-bis(m-tolyloxy)ethane, 2-benzyloxynaphthalene, and Esters such as di(4-methylbenzyl) oxalate, sulfonamides other than compounds having a sulfonylamide group represented by the above general formula (II) such as N-phenylsulfonamide, toluenesulfonic acid naphthyl ester, etc.
- Sulfonic acid esters aromatic hydrocarbon compounds such as m-terphenyl and p-benzylbiphenyl, various waxes, condensates of aromatic carboxylic acids and amines, higher linear glycols, higher ketones, diphenyl sulfone, Examples include p-hydroxybenzoic acid esters and phthalic acid diesters. These sensitizers can be used singly or in combination of two or more.
- the thermosensitive coloring layer may further contain an image stabilizer.
- the image stabilizer is not particularly limited, but examples include 4-benzyloxy-4'-(2-methylglycidyloxy)diphenylsulfone, 1,1,3-tris(2-methyl-4-hydroxy-5- cyclohexylphenyl)butane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane and the commercially available Tomirac 214 (trade name, manufactured by Mitsubishi Chemical Corporation) can be mentioned. . These image stabilizers can be used singly or in combination of two or more.
- thermosensitive coloring layer may further contain a filler, if desired.
- fillers include inorganic fillers and organic fillers.
- thermosensitive coloring layer may further contain other additives, if desired.
- additives may include, for example, lubricants, UV absorbers, waterproofing agents, dispersants, antifoaming agents, antioxidants and fluorescent dyes.
- the method for producing the heat-sensitive recording material according to the present embodiment is not particularly limited. It can be produced by dispersing in a medium to prepare a coating solution for the thermosensitive coloring layer, coating the coating solution on a support, and drying the coating solution.
- Dispersions containing components (A) to (C) are prepared by separately preparing a dispersion containing component (A) and a dispersion containing components (B) and (C). can be prepared by mixing dispersions of In each dispersion liquid, the components (A) to (C) are desirably finely divided and dispersed. Sand mills and ball mills, for example, can be used to prepare such dispersions.
- the binder is not particularly limited, and examples include cellulose derivatives such as hydroxyethyl cellulose and carboxymethyl cellulose, polyvinyl alcohols such as polyvinyl alcohol and modified polyvinyl alcohol, gelatin, casein, starch, polyacrylic acid, polyacrylic acid ester, poly Vinyl acetate, polyacrylamide, styrene-maleic acid copolymers, styrene-butadiene copolymers, polyamide resins, petroleum resins and terpene resins may be mentioned. These binders can be used singly or in combination of two or more.
- an undercoat layer containing at least one of an inorganic filler and an organic filler can be provided, if necessary.
- a cellulose derivative, a water-soluble resin such as polyvinyl alcohol, a water-soluble emulsion resin such as a styrene-butadiene copolymer, a water-insoluble resin, or a resin thereof may be added to the thermosensitive coloring layer.
- An overcoat layer formed from a material to which a monomer or oligomer such as a filler, an isocyanate, an unsaturated compound, or a cross-linking agent is added can be provided.
- the heat-sensitive recording material of the present embodiment can be a heat-sensitive multicolor recording material in which multiple layers of color-developing layers containing color-developing substances with different color tones are formed.
- the temperature of the oil bath was 120°C.
- the treatment liquid was stirred and mixed while nitrogen was introduced into the treatment liquid at a flow rate of 20 mL/min. After 2 hours had passed, the treatment liquid was air-cooled to 50°C. Then, the air-cooled treated liquid was subjected to suction filtration using a Buchner funnel to obtain a filtrate. The resulting filter cake was taken out and dried to obtain purified kraft lignin. Drying was performed using Perfect Oven PHH-200 (trade name, manufactured by ESPEC Co., Ltd.) at a temperature of 60° C. for 18 hours.
- Example measurement 0.4 g of kraft lignin obtained in each purification example or unpurified kraft lignin was accurately weighed and charged into a 22 mL vial. Then, 0.01 g of ethanol used in preparing the standard solution was added to the vial, the vial was sealed, and headspace GC-MS measurement was performed in the same manner as the measurement of the standard solution. The content of dimethyldisulfide was calculated using the integrated value of the peak at retention time 11.5 to 11.6 minutes corresponding to dimethyldisulfide obtained by measurement and the calibration curve. Table 1 shows the results.
- Coating liquid for forming under layer Calcined kaolin 20.0 parts by mass 10% by mass polyvinyl alcohol aqueous solution 30.0 parts by mass Dispersant (acetylene glycol-based nonionic surfactant) 0.3 parts by mass Binder (polyacetic acid Vinyl emulsion solid content 40% by mass) 18.0 parts by mass Distilled water 31.7 parts by mass Total 100.0 parts by mass
- a mixture having the above composition was mixed and stirred using a homodisper to prepare a coating liquid for forming an under layer.
- thermosensitive coloring layer Liquid A (first color developer dispersion), B liquid (second color developer dispersion) and C liquid having the following composition (parts by weight) (color-developing substance dispersion) were prepared respectively.
- Liquids A to C were prepared by wet dispersion using a sand mill until the average particle size reached about 0.5 ⁇ m.
- Liquid A first color developer dispersion
- Kraft lignin listed in Table 2 20 parts by mass 10% by mass polyvinyl alcohol aqueous solution 20 parts by mass Distilled water 60 parts by mass Total 100 parts by mass
- Liquid B (second color developer dispersion) Compounds listed in Table 3 20 parts by mass 10% by mass polyvinyl alcohol aqueous solution 20 parts by mass Distilled water 60 parts by mass Total 100 parts by mass
- Liquid C color-developing substance dispersion 3-dibutylamino-6-methyl-7-anilinofluorane 20 parts by mass 10% by mass polyvinyl alcohol aqueous solution 20 parts by mass Distilled water 60 parts by mass Total 100 parts by mass
- the compound represented by Structural Formula (VI) contained in Liquid B-4 was synthesized by the method described in International Publication No. 2019/044462.
- Example 1 A mixture having the following composition (parts by mass) was stirred and mixed with a homodisper to obtain a coating liquid for forming a thermosensitive coloring layer.
- a solution (A-1 solution) 22.5 parts by mass
- B solution (B-1 solution) 7.5 parts by mass
- C solution (color-forming material dispersion) 15.0 parts by mass
- the coating solution for forming the under layer is applied to high-quality paper with a basis weight of 65 g/m 2 with a bar coater so that the wet coating amount is about 23 g/m 2 , air-dried, calendered, and the under layer was prepared. Thereafter, a coating solution for forming a thermosensitive coloring layer is applied to the surface of the support provided with the under layer so that the wet coating amount is about 22 g/m 2 , air-dried, and calendered. A thermosensitive coloring layer was formed to prepare a thermosensitive recording material.
- thermosensitive coloring layer A thermal recording material was prepared in the same manner as in Example 1, except that the types and amounts (parts by mass) of liquids A and B blended in the coating liquid for forming the thermosensitive coloring layer were changed as shown in Tables 4 to 10. were made respectively.
- Residual rate (%) (color density after immersion in distilled water/color density before immersion in distilled water) x 100 Equation (2)
- ⁇ Damp heat resistance of non-image area background color The produced thermal recording material was allowed to stand under environmental conditions of 40° C. and 90% RH for 24 hours.
- the yellow value density of the non-image area (blank area) of the thermosensitive recording medium was measured with a Macbeth densitometer (trade name "RD-914", using an amber filter). Yellow value density was determined according to the following criteria. The results are shown in Tables 4-10.
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Abstract
Description
(C-2)群:スルホニルアミド基を有する下記一般式(II)で表される化合物
(C-3)群:4,4’-ジヒドロキシジフェニルスルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(3-アリル-4-ヒドロキシフェニル)スルホン、4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン、4-ヒドロキシ-4’-アリルオキシジフェニルスルホン、及び4-ベンジルオキシ-4’-ヒドロキシジフェニルスルホン
支持体としては、特に制限されないが、例えば、中性紙及び酸性紙等の紙、古紙パルプを用いた再生紙、合成紙、フィルム、不織布、並びに織布などを用いることができる。
感熱発色層は、(A)発色物質(以下、「(A)成分」ともいう)と、(B)ジメチルジスルフィドの含有量が2.5ppm以下であるクラフトリグニン(以下、「(B)成分」ともいう)と、(C)下記(C-1)群の化合物、下記(C-2)群の化合物、及び下記(C-3)群の化合物のうちの少なくとも一種の顕色剤(以下、「(C)成分」ともいう)と、を含む。
(C-2)群:スルホニルアミド基を有する下記一般式(II)で表される化合物
(C-3)群:4,4’-ジヒドロキシジフェニルスルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(3-アリル-4-ヒドロキシフェニル)スルホン、4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン、4-ヒドロキシ-4’-アリルオキシジフェニルスルホン、及び4-ベンジルオキシ-4’-ヒドロキシジフェニルスルホン
(A)成分(発色物質)としては、無色又は淡色のロイコ染料を用いることができる。ロイコ染料としては、例えば、フルオラン誘導体、キナゾリン誘導体、フタリド誘導体、トリフェニルメタン誘導体及びフェノチアジン誘導体を挙げることができる。これらのロイコ染料は、1種を単独で又は2種以上を組み合わせて用いることができる。
クラフトリグニンは、クラフト法によりリグニンを処理することで得られる単離リグニンである。クラフト法は、水酸化ナトリウム(NaOH)及び硫化ナトリウム(Na2S)等によりリグニンを化学変性させて分離する方法である。
((C-1)群の化合物)
上記式(I)中、R1及びR2は、得られる感熱記録材料の発色性及び画像部の保存性が一層向上する傾向にあることから、炭素数1~4のアルキル基が好ましく、炭素数1又は2のアルキル基がより好ましく、メチル基がさらに好ましい。
上記式(II)中、R3及びR4は、得られる感熱記録材料の発色性及び画像部の保存性が一層向上することから、炭素数1~4のアルキル基が好ましく、炭素数1又は2のアルキル基がより好ましく、メチル基がさらに好ましい。
4,4’-ジヒドロキシジフェニルスルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(3-アリル-4-ヒドロキシフェニル)スルホン、4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン、4-ヒドロキシ-4’-アリルオキシジフェニルスルホン及び、4-ベンジルオキシ-4’-ヒドロキシジフェニルスルホンは、それぞれ、下記構造式(VII)~(XII)で表される。
感熱発色層における(B)成分及び(C)成分の含有量の合計は、十分な発色性を有する感熱記録材料を得る観点から、発色物質100質量部に対して10~500質量部であることが好ましく、50~400質量部であることがより好ましく、100~300質量部であることがさらに好ましく、140~210質量部であることが特に好ましい。
感熱発色層は、本実施形態に係る感熱記録材料の効果を損なわない範囲において、(B)成分及び(C)成分以外の顕色剤を更に含有することができる。そのような顕色剤として、従来公知のものを用いることができる。
感熱発色層は、増感剤を更に含有していてもよい。増感剤としては、特に制限はないが、融点が90~140℃の増感剤であることが好ましい。このような増感剤としては、例えば、ステアリン酸アミド等の脂肪酸アミド類、1,2-ビスフェノキシエタン、1,2-ビス(m-トリルオキシ)エタン、2-ベンジルオキシナフタレンなどのエーテル類及びシュウ酸ジ(4-メチルベンジル)等のエステル類、N-フェニルスルホンアミド等の上記一般式(II)で表されるスルホニルアミド基を有する化合物以外のスルホンアミド類、トルエンスルホン酸ナフチルエステル等のスルホン酸エステル類、m-テルフェニル及びp-ベンジルビフェニル等の芳香族炭化水素化合物、各種ワックス類、芳香族カルボン酸とアミンとの縮合物、高級直鎖グリコール類、高級ケトン類、ジフェニルスルホン、p-ヒドロキシ安息香酸エステル類並びにフタル酸ジエステル類などを挙げることができる。これらの増感剤は、1種を単独で又は2種以上を組み合わせて用いることができる。
感熱発色層は、画像安定剤を更に含有していてもよい。画像安定剤としては、特に制限はないが、例えば、4-ベンジルオキシ-4’-(2-メチルグリシジルオキシ)ジフェニルスルホン、1,1,3-トリス(2-メチル-4-ヒドロキシ-5-シクロヘキシルフェニル)ブタン、1,1,3-トリス(2-メチル-4-ヒドロキシ-5-tert-ブチルフェニル)ブタン及び市販品のトミラック214(商品名、三菱ケミカル株式会社製)を挙げることができる。これらの画像安定剤は、1種を単独で又は2種以上を組み合わせて用いることができる。
感熱発色層は、必要に応じて、填料を更に含有していてもよい。填料としては、例えば、無機充填剤及び有機充填剤を挙げることができる。
感熱発色層は、必要に応じて、更に他の添加剤を含有していてもよい。他の添加剤としては、例えば、滑剤、紫外線吸収剤、耐水化剤、分散剤、消泡剤、酸化防止剤及び蛍光染料を挙げることができる。
本実施形態に係る感熱記録材料の製造方法は、特に制限されず、例えば、(A)~(C)成分及び必要に応じて添加するその他の成分を、適当な結合剤と共に、水性媒体などの媒体中に分散させて感熱発色層の塗工液を調製し、この塗工液を支持体上に塗布し、乾燥することにより製造することができる。
本実施形態の感熱記録材料においては、必要に応じて、例えば、無機充填剤及び有機充填剤のうち少なくとも一方を含む下塗り層を設けることができる。さらに、必要に応じて、感熱発色層の上に、セルロース誘導体、ポリビニルアルコール類などの水溶性樹脂、スチレン-ブタジエン共重合物などの水溶性エマルジョン樹脂、非水溶性樹脂、又は、それらの樹脂に填料、イソシアネート類、不飽和化合物などのモノマーやオリゴマー、架橋剤を加えた材料から形成されるオーバーコート層を設けることができる。
(精製例1)
クラフトリグニンと水とを加熱し、ジメチルジスルフィドを水と共沸留去させる方法により精製した。具体的には、まず、クラフトリグニン(メドウエストバコ社製、インジュリンAT)160g及び蒸留水640gを1Lセパラブルフラスコに投入し、処理液を得た。セパラブルフラスコには、留出液の冷却装置及び窒素を混合物中に導入できる窒素導入菅を設置した。セパラブルフラスコは、オイルバス上に設置した。処理液は、オイルバスで加熱することで昇温し、水の留出が始まってから2時間が経過するまで加熱した。オイルバスの温度は、120℃とした。加熱中は、窒素を流量20mL/分にて処理液中に導入しつつ、処理液を撹拌混合した。2時間の経過後、処理液を50℃まで空冷した。次いで、空冷した処理液をブフナーロートを用いて吸引濾過し、濾物を得た。得られた濾物を取り出し、乾燥することで精製したクラフトリグニンを得た。乾燥は、パーフェクトオーブンPHH-200(商品名、エスペック株式会社製)を用いて行い、温度は60℃、時間は18時間とした。
混合物の留出が始まってからの混合物の加熱時間、窒素ガス流量及びオイルバスの温度を表1に示す値としたこと以外は、実施例1と同様にして精製したクラフトリグニンを得た。
未精製クラフトリグニンとしてクラフトリグニン(メドウエストバコ社製、インジュリンAT)を準備した。
(検量線の作成)
電子天秤(sartorius A200S、sartorius社製)を用いて、標準物質としてジメチルジスルフィド(純度:99.0%、富士写真フイルム和光純薬株式会社製)を精秤し、エタノール(純度:99.5%、富士写真フイルム和光純薬株式会社製)にて順次希釈することで、濃度が、0.200mg/g、0.100mg/g、0.020mg/g及び0.004mg/gの標準溶液を作製した。得られた標準溶液を、22mLバイアル瓶に0.01g秤量し、ヘッドスペースGC―MS測定を行った。測定により得られたジメチルジスルフィドに対応する保持時間11.5~11.6分のピークの積分値から、検量線を作成した。
各精製例で得られたクラフトリグニン、又は未精製クラフトリグニン0.4gを精秤し、22mLバイアル瓶に投入した。そして、標準溶液を作製する際に使用したエタノール0.01gをバイアル瓶に加えた上でバイアル瓶を密閉し、標準溶液の測定と同様にヘッドスペースGC-MS測定を行った。測定により得られたジメチルジスルフィドに対応する保持時間11.5~11.6分のピークの積分値と、検量線とを用いて、ジメチルジスルフィドの含有量を算出した。結果を表1に示した。
(測定条件)
装置:Agilent7697A-7890A/5975C(ヘッドスペース-GC/MS)
カラム:製品名VF-1301ms(6%シアノプロピルフェニル-94%ジメチルポリシロキサン)
ヘッドスペースバイアル容量:22mL
ヘッドスペースオーブン平衡化温度:100°C
ループ温度:120°C
トランスファーライン温度:180°C
ヘッドスペース平衡化時間:20分間
サイクル時間:32分間
GC注入口温度:250°C
スプリット比:30:1
GC初期温度:40°C(3分間保持)
GC昇温速度:毎分10°C
GC最終温度:220°C(6分間保持)
MSイオン源温度:230°C
MS四重極温度:150°C
キャリアガス:ヘリウム
キャリアガス流量:1mL/min
取り込みMS範囲:30-350
(1)アンダー層形成用の塗工液
焼成カオリン 20.0質量部
10質量%ポリビニルアルコール水溶液 30.0質量部
分散剤(アセチレングリコール系非イオン界面活性剤) 0.3質量部
結合剤(ポリ酢酸ビニル乳化液固形分40質量%) 18.0質量部
蒸留水 31.7質量部
計100.0質量部
下記に示す組成(質量部)を有するA液(第一の顕色剤分散液)、B液(第二の顕色剤分散液)及びC液(発色物質分散液)をそれぞれ調製した。A液~C液の調製は、サンドミルを用いて平均粒子径が約0.5μmになるまで湿式分散を行った。
表2に記載のクラフトリグニン 20質量部
10質量%ポリビニルアルコール水溶液 20質量部
蒸留水 60質量部
計100質量部
表3に記載の化合物 20質量部
10質量%ポリビニルアルコール水溶液 20質量部
蒸留水 60質量部
計100質量部
3-ジブチルアミノ-6-メチル-7-アニリノフルオラン 20質量部
10質量%ポリビニルアルコール水溶液 20質量部
蒸留水 60質量部
計100質量部
下記の組成(質量部)よりなる混合物をホモディスパーにて攪拌混合し、感熱発色層形成用の塗工液とした。
B液(B-1液) 7.5質量部
C液(発色物質分散液) 15.0質量部
焼成カオリン 9.0質量部
2質量%ポリビニルアルコール水溶液 残部
計100.0質量部
感熱発色層形成用の塗布液に配合するA液及びB液の種類と配合量(質量部)とを表4~10に示すとおり変更したこと以外は、実施例1と同様にして感熱記録材料をそれぞれ作製した。
各実施例及び比較例において作製した感熱記録材料の評価は、次の方法により行った。
感熱紙印字評価試験装置(商品名:「TH-M2/PS」、オオクラエンジニアリング株式会社製)を用いて、印字電圧20V、パルス巾3msにて感熱記録材料を発色させ画像部を形成した。装置から取り出した直後の感熱記録材料の画像部について、感熱記録材料を鼻から約10cmの距離まで近づけ、臭気を以下の臭気の判定基準に従って官能評価を実施した。評価者6名の各判定結果の数値の平均値を総合判定結果とした。結果を表4~10に示した。
5:無臭又はほとんど臭いを感じない。
4:わずかに臭いを感じるが、不快臭とは感じない。
3:わずかに不快臭を感じる。
2:不快臭を感じる。
1:かなり強い不快臭を感じる。
(総合判定結果の基準)
A:評価者6名の各判定結果の数値の平均値が5.0
B:評価者6名の各判定結果の数値の平均値が4.0以上5.0未満
C:評価者6名の各判定結果の数値の平均値が3.0以上4.0未満
D:評価者6名の各判定結果の数値の平均値が2.0以上3.0未満
E:評価者6名の各判定結果の数値の平均値が1.0以上2.0未満
感熱紙印字評価試験装置(商品名:「TH-M2/PS」、オオクラエンジニアリング株式会社製)を用いて、パルス巾3msにて、0.07mJ/dotごとに印字エネルギーを高めて発色を行い、画像部を形成した。形成された画像部の色濃度を、マクベス濃度計(商品名:「RD-918」、マクベス社製)にて測定した。数値が小さいほど画像が薄く、数値が大きくなるほど濃い画像であることを示す。0.42mj/dotにて発色した場合の画像部の色濃度を、下記判定基準により判定を行った。結果を表4~10に示した。
A:1.20以上
B:1.00以上1.20未満
C:0.80以上1.00未満
D:0.60以上0.80未満
E:0.60未満
感熱紙印字評価試験装置(商品名:「TH-M2/PS」、オオクラエンジニアリング株式会社製)を用いて、印字電圧20V、パルス巾3msにて感熱記録材料を発色させ画像部を形成した。形成した画像部の色濃度をマクベス濃度計(商品名「RD-918」、マクベス社製)にて測定した。次いで、室温(20℃)のエタノール25容量部と蒸留水75容量部との混合液に感熱記録材料を浸して3時間放置した。この後、感熱記録材料を混合液から引き上げ、感熱記録材料の表面を濾紙で押さえながら自然乾燥した。乾燥後の感熱記録材料の画像部の色濃度をマクベス濃度計にて測定した。下記式(1)に基づき残存率(%)を算出し、残存率を下記判定基準に沿って判定した。結果を表4~10に示した。
残存率(%)=(混合液に浸漬した後の色濃度/混合液に浸漬する前の色濃度)×100)・・・式(1)
A:90%以上
B:70%以上90%未満
C:50%以上70%未満
D:30%以上50%未満
E:30%未満
感熱紙印字評価試験装置(商品名:「TH-M2/PS」、オオクラエンジニアリング株式会社製)を用いて、印字電圧20V、パルス巾3msにて感熱記録材料を発色させ画像部を形成した。形成した画像部の色濃度をマクベス濃度計(商品名「RD-918」、マクベス社製)にて測定した。次いで、室温(20℃)の蒸留水に感熱記録材料を浸して24時間放置した。この後、感熱記録材料を蒸留水から引き上げ、感熱記録材料の表面を濾紙で押さえながら自然乾燥した。乾燥後の感熱記録材料の画像部の色濃度をマクベス濃度計にて測定した。下記式(2)に基づき残存率(%)を算出し、残存率を下記判定基準に沿って判定した。結果を表4~10に示した。
残存率(%)=(蒸留水に浸漬した後の色濃度/蒸留水に浸漬する前の色濃度)×100・・・式(2)
A:90%以上
B:85%以上90%未満
C:80%以上85%未満
D:75%以上80%未満
E:75%未満
作製した感熱記録体を、40℃、90%RH環境条件下で24時間静置した。感熱記録体の非画像部(白紙部)のYellow値濃度をマクベス濃度計(商品名「RD-914」、アンバーフィルター使用)で測定した。Yellow値濃度を下記判定基準に沿って判定した。結果を表4~10に示した。
A:0.1未満
B:0.1以上0.4未満
C:0.4以上0.5未満
D:0.5以上0.6未満
E:0.6以上
作製した感熱記録体について、キセノンフェードメーター(ATLAS社製、商品名「Ci3000F」)を用いて照射強度67W/m2で6時間照射処理をした。照射処理後の感熱記録材料の非画像部(白紙部)のYellow値濃度をマクベス濃度計(商品名「RD-914」、アンバーフィルター使用)で測定した。Yellow値濃度を下記判定基準に沿って判定した。結果を表4~10に示した。
A:0.2未満
B:0.2以上0.4未満
C:0.4以上0.5未満
D:0.5以上0.6未満
E:0.6以上
Claims (4)
- 支持体と、前記支持体上に設けられた感熱発色層と、を備え、
前記感熱発色層が、(A)発色物質と、(B)ジメチルジスルフィドの含有量が2.5ppm以下であるクラフトリグニンと、(C)下記(C-1)群の化合物、下記(C-2)群の化合物、及び下記(C-3)群の化合物のうちの少なくとも一種の顕色剤と、を含む、感熱記録材料。
(C-1)群:スルホニルウレア基を有する下記一般式(I)で表される化合物
(C-2)群:スルホニルアミド基を有する下記一般式(II)で表される化合物
(C-3)群:4,4’-ジヒドロキシジフェニルスルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(3-アリル-4-ヒドロキシフェニル)スルホン、4-ヒドロキシ-4’-イソプロポキシジフェニルスルホン、4-ヒドロキシ-4’-アリルオキシジフェニルスルホン、及び4-ベンジルオキシ-4’-ヒドロキシジフェニルスルホン
[式中、R1及びR2は、ハロゲン原子、炭素数1~4のアルキル基、炭素数2~4のアルケニル基、又は、炭素数1~4のアルコキシ基を示し、n1及びn2は0~3の整数を示し、R1及びR2が、複数存在する場合には、R1同士又はR2同士は同一であっても異なっていてもよい。]
[式中、X1及びX2は、それぞれ独立に-O-又は-NH-を示し、R3は水素原子、又は-SO2-R4を示し、R4は置換もしくは無置換のアルキル基、アラルキル基又はアリール基を示し、R5及びR6はそれぞれ独立に水素原子又はアルキル基を示し、n3は0又は1を示し、n4は0~2の整数を示し、R3が、複数存在する場合には、R3同士は同一であっても異なっていてもよい。] - 前記感熱発色層において、前記(C)成分の含有量に対する前記(B)成分の含有量の比((B)成分/(C)成分)は、質量比で、20/80~90/10である、請求項1に記載の感熱記録材料。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/573,930 US20240316975A1 (en) | 2021-06-30 | 2022-05-25 | Thermosensitive recording material |
| EP22832657.5A EP4365220A4 (en) | 2021-06-30 | 2022-05-25 | Thermosensitive recording material |
| CN202280045692.4A CN117580715A (zh) | 2021-06-30 | 2022-05-25 | 热敏记录材料 |
| KR1020247002919A KR102839012B1 (ko) | 2021-06-30 | 2022-05-25 | 감열 기록 재료 및 이의 제조방법 |
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| JP2021108546A JP7362694B2 (ja) | 2021-06-30 | 2021-06-30 | クラフトリグニン、感熱記録用顕色剤及び感熱記録材料 |
| JP2021-108546 | 2021-06-30 | ||
| JP2021-214415 | 2021-12-28 | ||
| JP2021214415A JP7374980B2 (ja) | 2021-12-28 | 2021-12-28 | 感熱記録材料及びその製造方法 |
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| WO2023276499A1 true WO2023276499A1 (ja) | 2023-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2022/021349 Ceased WO2023276499A1 (ja) | 2021-06-30 | 2022-05-25 | 感熱記録材料 |
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| Country | Link |
|---|---|
| US (1) | US20240316975A1 (ja) |
| EP (1) | EP4365220A4 (ja) |
| KR (1) | KR102839012B1 (ja) |
| WO (1) | WO2023276499A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025234327A1 (ja) * | 2024-05-09 | 2025-11-13 | 日本製紙株式会社 | 感熱記録体 |
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| JP7362694B2 (ja) * | 2021-06-30 | 2023-10-17 | 日華化学株式会社 | クラフトリグニン、感熱記録用顕色剤及び感熱記録材料 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20240316975A1 (en) | 2024-09-26 |
| KR102839012B1 (ko) | 2025-07-29 |
| EP4365220A1 (en) | 2024-05-08 |
| EP4365220A4 (en) | 2025-06-11 |
| KR20240027041A (ko) | 2024-02-29 |
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