WO2023002786A1 - 感熱記録材料 - Google Patents
感熱記録材料 Download PDFInfo
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- WO2023002786A1 WO2023002786A1 PCT/JP2022/024282 JP2022024282W WO2023002786A1 WO 2023002786 A1 WO2023002786 A1 WO 2023002786A1 JP 2022024282 W JP2022024282 W JP 2022024282W WO 2023002786 A1 WO2023002786 A1 WO 2023002786A1
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- recording material
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- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/46—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 characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
- B41M5/465—Infrared radiation-absorbing materials, e.g. dyes, metals, silicates, C black
-
- 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
- B41M5/32—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers one component being a heavy metal compound, e.g. lead or iron
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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
-
- 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
- B41M5/40—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
- B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
-
- 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
- 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
- B41M5/46—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 characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
-
- 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
- B41M2205/32—Thermal receivers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
Definitions
- the present invention relates to a heat-sensitive recording material that forms an image by irradiation with an infrared laser beam, and more particularly to a heat-sensitive recording material that is suitable for preparing a block copy.
- a wet processing image forming method using a silver halide photosensitive material has long been commonly used as a high-quality image recording method used to prepare a block copy.
- wet processing image forming methods require disposal of waste liquids such as developing solutions and fixing solutions, which imposes a large environmental burden.
- image forming systems such as inkjet printers, electrophotography, dye thermal transfer systems, and the like have been put to practical use.
- a thermal head or an infrared laser is applied to a heat-sensitive recording material having a heat-sensitive recording layer on a support.
- a method of forming an image using light may be mentioned.
- the thermal recording method using an infrared laser beam is superior from the viewpoint of high-density recording and high-quality recording.
- Patent Document 1 describes a thermally reducible silver source, a reducing agent for silver ions, and a wavelength range of about 500 to 1100 nm, which can record high-density images.
- Patent Document 2 discloses an organic silver salt, an organic silver salt developer, and an infrared absorbing material capable of recording high-quality images.
- a thermal recording material for infrared laser light is disclosed which contains a dye and a water-soluble binder.
- Patent Document 3 a non-photosensitive organic silver salt, a reducing agent for silver ions, a binder, a color tone adjusting agent, and an absorber that absorbs radiation in the wavelength range of 750 to 1100 nm are contained, and the ultraviolet concentration is low and the residual color is low.
- thermochromic imaging materials are disclosed.
- Patent Document 4 discloses a photothermographic material containing a specific fluorine compound. It is described that it improves coating suitability and suppresses the occurrence of streaks, cissing, and unevenness. However, further reduction of pinholes has been demanded.
- Patent Document 5 discloses an image forming method in which a photothermographic material containing photosensitive silver halide particles, an organic silver salt, a reducing agent and a binder is exposed to a laser beam, and a visible image is formed by thermal development. It is described that the photothermographic material may contain a reducing agent in any layer on the side having the image forming layer.
- the thermal recording material is locally heated by irradiating the infrared laser beam to cause the thermal recording layer to develop a color. draw.
- the infrared laser beam has high energy, the components contained in the thermal recording material and the by-products generated in the coloring process of the thermal recording layer volatilize or explode from the surface of the thermal recording material as spouts, and the thermal recording material There was a problem of contamination of the surface of the substrate and the infrared laser irradiation device.
- the heat-sensitive recording material of the existing technology can adjust the color tone and density of the formed image by adding a tone agent (toner).
- a tone agent toner
- Patent Document 1 mentioned above mentions phthalazinone, phthalazine, and phthalimide as conventional toners
- Patent Document 6 describes an image forming layer containing a photosensitive silver halide, a non-photosensitive organic silver salt and a reducing agent. and a non-photosensitive layer and containing phthalazinones and phthalic acids as toning agents.
- Patent Document 7 discloses a non-photosensitive thermographic recording material exhibiting acceptable neutral image tone describes a thermographic recording material having on a support a heat-sensitive element containing a non-photosensitive silver salt of a carboxylic acid, a reducing agent, and a specific binder, and containing phthalazinone, a phthalazinone derivative, etc. as a toning agent. is described. Also, US Pat. No. 6,200,400 describes an imaging element addressable with infrared laser light, in which polar groups such as carboxylic acid groups influence the morphology of a silver metal image to produce gradation. Since it can be improved, it is stated that it can contain a polymer having a specific repeating unit that yields a carboxylic acid by a cleavage reaction at high temperature.
- Patent Document 2 describes a heat-sensitive recording material for infrared laser light provided with a heat-sensitive layer containing an organic silver salt, a developer, a water-soluble binder, and a specific merocyanine compound as an infrared-absorbing dye. It is described that a carboxylic acid may be contained as a stabilizer from the viewpoint of preventing thermal fogging and stabilizing the background after image formation.
- a first object of the present invention is to provide a heat-sensitive recording material from which a high-contrast image can be obtained by irradiation with an infrared laser beam.
- a second object of the present invention is to provide a heat-sensitive recording material capable of obtaining a high-contrast image by irradiation with an infrared laser beam and reducing the generation of pinholes.
- a third object of the present invention is to provide a heat-sensitive recording material capable of obtaining a high-contrast image by irradiation with an infrared laser beam and having reduced spouts generated from the surface of the heat-sensitive recording material.
- a fourth object of the present invention is to obtain a high-contrast image by irradiation with an infrared laser beam, and to measure the visible light transmission density of the image area to optimize the irradiation amount of the infrared laser beam. It is to provide recording materials.
- the above problems are solved by the following inventions.
- the first purpose is to obtain the following condition: "On a light-transmissive support, the ratio ⁇ (830)/ ⁇ (365) of the molar extinction coefficient ⁇ (830) at 830 nm and the molar extinction coefficient ⁇ (365) at 365 nm is 4.0.
- the problem is solved by the first invention, which is a heat-sensitive recording material.
- the second object is solved by the second invention, wherein the infrared absorption layer of the heat-sensitive recording material of the first invention further contains a reducing agent.
- the third object is solved by the third invention, wherein the protective layer of the thermal recording material of the first invention contains hydrophilic particles and a hydrophobic resin, and the thickness of the protective layer is 2.3 to 9.4 ⁇ m. be done.
- the fourth object is "on a light-transmitting support, an infrared-absorbing layer containing an infrared-absorbing dye from the side close to the light-transmitting support, a non-photosensitive organic silver salt, a reducing agent, and the general formula ( 1)
- a thermal recording material having at least a thermal recording layer containing at least one compound selected from the group of compounds represented by to (4) and a protective layer in this order. .
- n represents an integer of 2 to 7.
- R 1 represents a hydrogen atom or a methyl group.
- R 2 to R 9 represent a hydrogen atom, a methyl group, or a methoxy group.
- the third aspect of the invention it is possible to provide a heat-sensitive recording material in which a high-contrast image can be obtained by irradiation with an infrared laser beam and ejected matter generated from the surface of the heat-sensitive recording material is reduced.
- a high-contrast image can be obtained by irradiating the infrared laser beam, and the irradiation amount of the infrared laser beam can be optimized by measuring the visible light transmission density of the image portion.
- a heat-sensitive recording material can be provided.
- the heat-sensitive recording material of the present invention has an infrared absorption layer, a heat-sensitive recording layer, and a protective layer, which will be described later, on a light-transmitting support in this order from the side near the support.
- light-transmitting supports include resin films such as polyethylene terephthalate (PET), polyethylene naphthalate, cellulose nitrate and polycarbonate, and inorganic materials such as glass.
- PET polyethylene terephthalate
- the light-transmitting support means a support having a total light transmittance of 60% or more, and a support having a total light transmittance of 70% or more is more preferable.
- the haze value of the light-transmitting support is preferably 10% or less.
- the light-transmitting support may have known layers such as an easy-adhesion layer, a hard coat layer and an antistatic layer.
- the thickness of the light-transmitting support in the invention is not particularly specified, it is preferably 50 to 300 ⁇ m from the viewpoint of handleability.
- the infrared absorbing layer of the heat-sensitive recording material of the present invention contains an infrared absorbing dye.
- the infrared absorbing dye of the present invention means a known compound that absorbs infrared rays. Among them, an infrared absorbing dye that absorbs electromagnetic waves in a wavelength range of 600 to 1500 nm is preferable, an infrared absorbing dye that has an absorption maximum in a wavelength range of 650 to 1100 nm is more preferable, and an infrared absorption dye that has an absorption maximum in a wavelength range of 750 to 1100 nm. Dyes are more preferred.
- the infrared absorbing dye of the present invention can provide a heat-sensitive recording material capable of obtaining a high-contrast image suitable for making a block copy, it has an emission peak in the ultraviolet region of a high-pressure mercury lamp or a chemical lamp. Absorption in the wavelength region of 450 nm is small, that is, ⁇ (830)/ ⁇ which is the ratio of the molar extinction coefficient ⁇ (830) at 830 nm and the molar extinction coefficient ⁇ (365) at 365 nm on the light-transmitting support. It is preferred to have an infrared absorbing layer containing an infrared absorbing dye with (365) of 4.0 or more. When ⁇ (830)/ ⁇ (365) is 4.0 or more, it is possible to provide a heat-sensitive recording material from which a high-contrast image can be obtained by irradiation with an infrared laser beam.
- the infrared absorbing dye of the present invention can provide a heat-sensitive recording material capable of obtaining a high-contrast image suitable for making a block copy, it has an emission peak in the ultraviolet region of a high-pressure mercury lamp or a chemical lamp. It is preferred that the absorption of electromagnetic waves in the wavelength range of 450 nm is as small as possible compared to the absorption of electromagnetic waves in the wavelength range of 600-1500 nm. That is, ⁇ 1/ ⁇ 2, which is the ratio of the absorbance ⁇ 1 at the maximum absorption in the wavelength range of 600 to 1500 nm to the absorbance ⁇ 2 at the maximum absorption in the wavelength range of 350 to 450 nm, is preferably 4.0 or more. When ⁇ 1/ ⁇ 2 is 4.0 or more, it is possible to provide a heat-sensitive recording material capable of obtaining a high-contrast image when irradiated with an infrared laser beam.
- the infrared absorbing dyes described in paragraphs 0027 and 0028 above include compounds having a polymethine skeleton such as squarylium, cyanine, merocyanine, and bis(aminoaryl)polymethine. Specifically, the following general formulas (5) to ( 7), but the present invention is not limited thereto.
- R 10 to R 35 in general formulas (5) to (7) are substituents, hydrogen atom, alkyl group, aryl group, alkoxy group, acyl group, ester group, amide group, halogen atom, hydroxy group and thiol group. , a thioether group, a sulfonyl group, and the like. These may be the same substituents or different substituents, and may be combined with other substituents to form a ring structure.
- X 1 ⁇ represents a negatively charged atom or atomic group, and includes halogen ions, oxoacids such as perchlorate ions, tetrafluoroborate, hexafluorophosphate, alkyl and arylsulfonates. Specific examples include compounds such as exemplary compounds (1) to (7), but are not limited to these.
- a 2-butanone solution of an infrared absorbing dye is prepared and a UV-visible spectrophotometer UV-2600 (manufactured by Shimadzu Corporation) is used.
- UV-2600 manufactured by Shimadzu Corporation
- a high-contrast image means that "Dmax-Dmin", which is the difference between the ultraviolet light transmission density (Dmax) of the image area and the ultraviolet light transmission density (Dmin) of the non-image area, is 3.0 or more. More preferably, "Dmax-Dmin” is 3.5 or more.
- X-Rite registered trademark
- 361T manufactured by X-Rite Co., Ltd.
- the content of the infrared absorbing dye in the infrared absorbing layer is not particularly limited, but is preferably 0.1 to 20% by weight, more preferably 0.2 to 17.5% by weight, based on the total solid content of the infrared absorbing layer. .3 to 15% by weight is particularly preferred.
- the infrared absorbing layer may contain a single infrared absorbing dye, or may contain two or more infrared absorbing dyes.
- a heat-sensitive recording material having an infrared absorbing layer containing the above-mentioned infrared absorbing dye can produce a high-contrast image when irradiated with an infrared laser beam.
- the infrared absorbing layer preferably contains a reducing agent in addition to the infrared absorbing dye, so that the occurrence of fine pinholes can be reduced.
- the reducing agent contained in the infrared absorbing layer is not particularly limited, and aldehyde compounds such as glyoxal, glutaraldehyde and 3-methylglutaraldehyde, hydrazine compounds such as hydrazine sulfate and hydrazine carbonate, hydroquinone, catechol, 4-methylcatechol, 4- Polyhydroxybenzene compounds such as tert-butyl catechol, chlorohydroquinone, pyrogallol, polyhydroxybenzoic acid compounds such as gallic acid, methyl gallate, propyl gallate, 3,4-dihydroxybenzoic acid, and ethyl 3,4-dihydroxybenzoate , 2-aminophenol, 3-aminophenol, 4-aminophenol and other aminophenol compounds, glucose, fructose and other sugars, ascorbic acid, isoascorbic acid, ascorbyl stearate, ascorbyl palmitate and other known ascorbic acids can be used.
- the content of the reducing agent contained in the infrared absorbing layer is not particularly limited, but is preferably 1 to 25% by weight, more preferably 2 to 20% by weight, and 3 to 16% by weight based on the total solid content of the infrared absorbing layer. Especially preferred.
- the infrared absorbing layer may contain a single reducing agent, or may contain two or more reducing agents.
- the infrared absorbing layer preferably contains a binder component together with the infrared absorbing dye described above.
- Thermoplastic resins are preferred as such binder components, and typified by, for example, cellulose derivatives such as hydroxyethyl cellulose and hydroxypropyl cellulose, acrylic resins, polyester resins, polyurethane resins, vinyl chloride resins, vinyl acetate resins, polyolefin resins, and polyvinyl butyral resins.
- Polyvinyl acetal resin, polyvinyl alcohol resin and the like are exemplified.
- binder components may be used by dissolving them in water or an organic solvent, or latex in which hydrophobic polymer solids are dispersed in the form of fine particles, or polymer molecules in which micelles are formed and dispersed.
- the binder component described above preferably forms a transparent film after drying. Further, these binder components may be used in combination of two or more resins that are compatible with each other, if necessary.
- the infrared absorbing layer of the heat-sensitive recording material of the present invention is prepared by preparing an infrared absorbing layer coating solution containing the above-described infrared absorbing dye, binder component, and optional components, and applying the infrared absorbing layer coating solution. It is preferably formed by coating and drying on the light-transmissive support described above. Further, the film thickness of the infrared absorption layer is preferably 0.01 to 5.0 ⁇ m.
- the coating amount of the infrared absorbing layer coating liquid is preferably 0.01 to 8.0 g/m 2 in terms of dry mass, more preferably 0.05 to 5.0 g/m 2 .
- the coating liquid for the infrared absorbing layer may contain various surfactants. Any type of nonionic, anionic, cationic or the like may be used as the surfactant, and is not particularly limited.
- the heat-sensitive recording layer of the heat-sensitive recording material of the present invention contains a non-photosensitive organic silver salt.
- the organic silver salt is reduced by being heated together with a reducing agent described below to form a silver image.
- a reducing agent described below to form a silver image.
- gallic acid, oxalic acid, behenic acid, stearic acid, palmitic acid, lauric acid, etc. as described in Research Disclosure, Sections 17029(II) and 29963(XVI) of Research Disclosure concerning photothermographic materials.
- silver salts of organic acids silver salts of carboxyalkylthiourea such as 1-(3-carboxypropyl) thiourea and 1-(3-carboxypropyl)-3,3-dimethylthiourea; formaldehyde, acetaldehyde, butyraldehyde and the like
- Complexes of silver with polymer reaction products of aldehydes and aromatic carboxylic acids such as salicylic acid, benzoic acid, 3,5-dihydroxybenzoic acid and 5,5-thiodisalicylic acid; 3-(2-carboxyethyl) -silver salts or complexes of thiones such as 4-hydroxymethyl-4-thiazoline-2-thione, 3-carboxymethyl-4-methyl-4-thiazoline-2-thione; imidazole, pyrazole, urazole, 1,2, silver salts or complexes of nitrogen-containing heterocycles selected from 4-triazole, 1H-tetrazole, 3-amino
- the content of the organic silver salt contained in the thermosensitive recording layer can be appropriately adjusted depending on the maximum density required for use as a block copy. 3.0 g is preferred, and 0.5 to 2.0 g is more preferred.
- thermosensitive recording layer in the present invention does not substantially contain silver halide.
- substantially free means that the amount of silver halide contained in the heat-sensitive recording layer is less than 1% by mass based on the total solid content of the heat-sensitive recording layer. It is possible to obtain a heat-sensitive recording material capable of plate-making a high-contrast image by suppressing an increase in transmission density of ultraviolet light in a non-image area during storage and normal use of the recording material.
- the heat-sensitive recording layer preferably contains a reducing agent.
- reducing agents include hydroquinone, catechol, 4-methylcatechol, 4-tert-butylcatechol, chlorohydroquinone, polyhydroxybenzene compounds such as pyrogallol, gallic acid, methyl gallate, propyl gallate, stearyl gallate, 2, polyhydroxybenzoic acid compounds such as 5-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid and ethyl 3,4-dihydroxybenzoate; aminophenol compounds such as 2-aminophenol, 3-aminophenol and 4-aminophenol; Examples include 1-phenyl-3-pyrazolidone and its derivatives, hydroxylamines, polyhydroxyindanes described in JP-A-06-317870, and dihydroxybenzoic acid derivatives described in JP-A-2001-328357.
- polyhydroxybenzene compounds and polyhydroxybenzoic acid compounds are preferable from the viewpoint
- the content of the reducing agent contained in the heat-sensitive recording layer can vary widely depending on the type of reducing agent and the type of organic silver salt. preferably 0.5 to 2.0 mol. For various purposes, two or more of the above reducing agents may be used in combination.
- the heat-sensitive recording layer in the invention preferably contains at least one compound selected from the group of compounds represented by general formulas (1) to (4).
- n represents an integer of 2-7.
- R 1 represents a hydrogen atom or a methyl group.
- R 2 to R 9 in general formulas (3) and (4) each represent a hydrogen atom, a methyl group, or a methoxy group.
- General formula (2) specifically represents fumaric acid and mesaconic acid.
- General formula (3) is terephthalic acid and terephthalic acid derivatives, and specific examples thereof include terephthalic acid, 2-methylterephthalic acid, 2,5-dimethylterephthalic acid, and 2-hydroxyterephthalic acid.
- General formula (4) is isophthalic acid and isophthalic acid derivatives, specifically isophthalic acid, 5-methylisophthalic acid, 4,6-dimethylisophthalic acid, 5-methoxyisophthalic acid, 4-hydroxyisophthalic acid, 5- Hydroxyisophthalic acid and the like can be mentioned.
- succinic acid, fumaric acid, isophthalic acid, and isophthalic acid derivatives are more preferably used because they are excellent in the effect that increases with .
- two or more of the above compounds may be selected and used together.
- the content of the compounds represented by formulas (1) to (4) in the heat-sensitive recording layer is preferably 0.05 to 15% by weight, preferably 0.1 to 10% by weight, based on the total solid content of the heat-sensitive recording layer. % is more preferred, and 0.5 to 5% by mass is even more preferred.
- X-Rite registered trademark 361T manufactured by X-Rite Co., Ltd.
- a method of measuring in the visible light mode and the ultraviolet light mode can be exemplified.
- the heat-sensitive recording layer of the heat-sensitive recording material of the present invention preferably contains a so-called toning agent known in the field of thermography or photothermography.
- toning agents are known in Research Disclosure Nos. 17029(V) and 29963(XXII) of the above-mentioned photothermographic materials.
- Mercapto compounds typified by 1,2,4-triazole, phthalazine, phthalazone, 4-methylphthalic acid, tetrachlorophthalic acid and phthalic acid derivatives typified by their anhydrides, 1,3-benzoxazine-2,4 -Benzoxazine derivatives represented by diones, and the like.
- two or more of the above-described toning agents may be used in combination.
- the heat-sensitive recording layer of the heat-sensitive recording material of the present invention contains various accelerators, stabilizers and their precursors for the purpose of suppressing or promoting the formation of image silver and improving the storage stability of the heat-sensitive recording material before and after image formation. It may contain a body. Specific examples include benzotriazole, 5-methylbenzotriazole, 5-chlorobenzotriazole, 2-mercaptobenzotriazole, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, and 2, which are known as stabilizers and inhibitors for photography.
- -mercaptobenzoxazole 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene, 1-phenyl-5-mercaptotetrazole, 2-amino-5-mercapto-1,3,4-thiadiazole, It can be selected from 3-mercapto-5-phenyl-1,2,4-triazole, 4-benzamido-3-mercapto-5-phenyl-1,2,4-triazole and the like.
- two or more of the above accelerators and stabilizers may be used in combination.
- the heat-sensitive recording layer of the heat-sensitive recording material of the present invention preferably contains a binder component for the purpose of retaining the non-photosensitive organic silver salt.
- a thermoplastic resin is preferable as such a binder component, and for example, the same thermoplastic resin as the binder component of the infrared absorbing layer described above can be preferably used.
- the binder component may use together 2 or more types of mutually soluble resin as needed.
- the content of the binder component contained in the thermosensitive recording layer is preferably 10 to 70% by mass with respect to the total solid content of the thermosensitive recording layer.
- the binder component contained in the heat-sensitive recording layer described above preferably does not contain free halide ions such as chloride ions and bromide ions.
- Halide ions react with silver ions of the organic silver salt to form photosensitive silver halide, which causes the heat-sensitive recording material of the present invention to deteriorate in light resistance.
- the content of halide ions is preferably 500 ppm or less, more preferably 300 ppm or less, and even more preferably 100 ppm or less, relative to the content of the binder component.
- thermosensitive recording layer contains ultraviolet absorbers, antioxidants, silane coupling agents, pigments, dyes, pH adjusters, surfactants, antifoaming agents, thickeners, softeners, lubricants, and antistatic agents. It may contain known additives such as agents and antiblocking agents.
- the heat-sensitive recording layer is preferably adjacent to the above-mentioned infrared absorbing layer without any other layer interposed therebetween. image can be obtained.
- a heat-sensitive recording layer coating solution containing the above-described organic silver salt, a reducing agent, a toning agent, a binder component, etc. is prepared, and the heat-sensitive recording layer coating solution is applied to the above-described infrared absorption layer. It is preferably formed by coating and drying on the surface.
- the film thickness of the thermosensitive recording layer is preferably 0.5 to 20 ⁇ m.
- the coating amount of the thermosensitive recording layer coating solution is preferably 2.0 to 30.0 g/m 2 , more preferably 5.0 to 20.0 g/m 2 , and more preferably 7.0 to 15.0 g/m 2 in dry mass. More preferred is m2 .
- thermosensitive recording layer coating liquid may contain various surfactants.
- Nonionic surfactants, anionic surfactants, cationic surfactants, and the like may be used, and are not particularly limited.
- the heat-sensitive recording material in the present invention protects the heat-sensitive recording layer from contact with the light-sensitive material and impact during handling, and also reduces ejections generated from the surface of the heat-sensitive recording material by irradiation with infrared laser light. It has a protective layer on the layer.
- the protective layer preferably contains a resin component, and specific resin components include gelatin, acrylic resin, polyester resin, polyurethane resin, vinyl chloride resin, vinyl acetate resin, polyolefin resin, polyvinyl alcohol resin, polyvinyl acetal resin, and the like. are exemplified. These resins and aqueous dispersions of resins are commercially available and readily available. Moreover, a cross-linking agent may be contained in order to improve the scratch resistance of the protective layer.
- the protective layer may contain various matting agents for the purpose of improving vacuum properties and scratch resistance.
- the matting agent is preferably used by dispersing it in the protective layer.
- a high-speed stirrer such as a homodisper is suitable for dispersing the matting agent.
- Either an organic or inorganic matting agent can be used.
- organic matting agents include silicone, polytetrafluoroethylene, polymethyl methacrylate, and polyacrylate
- inorganic matting agents include silica, alumina, talc, and mica.
- examples of commercially available products include Tospearl (registered trademark) 120, 130, 145, and 2000B sold by Momentive Performance Materials Japan LLC as silicone resin-based matting agents, and AGC Si Tech as silica-based matting agents.
- Sunsphere (registered trademark) H-31, H-51, NP-30, and the like, which are sold by Co., Ltd., can be exemplified. These are single fine particles, but as the form of the matting agent, either single fine particles or fine particle aggregate particles in which fine particles are aggregated may be used.
- the amount of the matting agent contained in the protective layer is preferably 0.5 to 40% by mass, more preferably 1 to 30% by mass, based on the amount of the resin component in the protective layer.
- a protective layer coating solution containing the above resin component, matting agent, etc. is prepared, the protective layer coating solution is applied on the above heat-sensitive recording layer, and dried. preferably formed.
- the protective layer coating solution may contain various surfactants. Nonionic surfactants, anionic surfactants, cationic surfactants, and the like may be used, and are not particularly limited.
- the protective layer in the present invention preferably contains hydrophilic particles and a hydrophobic resin.
- Such a configuration is preferable because it is possible to effectively reduce ejected substances during infrared laser light irradiation.
- the mechanism by which ejected matter can be suppressed by this configuration is unknown, but since there is a limit to the affinity between the hydrophobic resin and the hydrophilic particles, a fine gap is generated between the hydrophobic resin and the hydrophilic particles, causing an infrared laser beam.
- Components contained in the thermal recording material volatilized at the time of irradiation and by-products generated during the coloring process can escape gently through the gaps, thereby avoiding the components contained in the thermal recording material from exploding and, as a result, suppressing ejections. Infer.
- the above-mentioned hydrophilic particles mean particles whose surfaces are easily wetted by water.
- metals such as gold, silver, and copper, metal oxides such as silica, alumina, and zirconia, layered silicates, and composites of these, inorganic material particles that are easily wetted by water, and acrylic Particles, particles of an organic material such as styrene particles and melamine particles having a property that the surface is easily wetted with water, particles of an organic-inorganic composite material having a property that the surface is easily wetted with water, and the like can be used.
- hydrophilic particles As a method for determining whether the particles are hydrophilic or not, 10 mL of pure water is weighed in a glass beaker, 0.1 g of the particles are added, stirred, and allowed to stand for 10 minutes. A method for judging hydrophilicity can be exemplified.
- the hydrophilic particles may be subjected to known surface treatment. Two or more types of hydrophilic particles may be used in combination.
- hydrophilic inorganic particles are preferable because they are excellent in the effect of reducing ejections generated from the surface of the thermosensitive recording material by irradiation with infrared laser light.
- the lower limit of the average particle size of the hydrophilic particles is not particularly limited, it is preferably 1 ⁇ m or more because it is possible to effectively reduce ejected substances generated from the surface of the thermosensitive recording material by irradiation with infrared laser light.
- the upper limit of the average particle size of the hydrophilic particles is not particularly limited, it is preferably 10 ⁇ m or less because a high-contrast image can be obtained.
- the average particle size a volume-based calculated value obtained by laser diffraction/scattering particle size distribution measurement can be used. Specifically, a method of measuring using a laser diffraction/scattering particle size distribution analyzer MT3000II manufactured by Microtrack Bell Co., Ltd. can be exemplified.
- a commercial product can be used as the hydrophilic particles preferably contained in the protective layer.
- silica particles Seahoster (registered trademark) KE series sold by Nippon Shokubai Co., Ltd., Sunsphere (registered trademark) series sold by AGC Si Tech Co., Ltd., and Fuji Silysia Chemical Co., Ltd.
- As alumina particles fine alumina SA30 series, SA40 series, SMM series, etc. sold by Nippon Light Metal Co., Ltd. Acrylic particles are sold by Soken Chemical Co., Ltd. Chemisnow (registered trademark) MX series sold by Sekisui Plastics Co., Ltd. Techpolymer (registered trademark) AQS series sold by Sekisui Plastics Co., Ltd.
- Optobeads (registered trademark) sold by Nissan Chemical Co., Ltd. as melamine particles ) series, Eposter (registered trademark) series sold by Nippon Shokubai Co., Ltd., and the like, all of which can be preferably used.
- the content of the hydrophilic particles is not particularly limited, it is preferably 1.2 to 40% by mass, more preferably 1.6 to 30% by mass, based on the total solid content of the protective layer.
- the protective layer of the present invention may contain a hydrophobic resin within the range of the content of the hydrophilic particles or less, preferably the hydrophobic resin is 50% by mass or less with respect to the content of the hydrophilic particles. Particularly preferably, the content of the hydrophobic resin is 25% by mass or less with respect to the content of the hydrophilic particles.
- the hydrophobic resin that the protective layer preferably contains together with the hydrophilic particles described above is not particularly limited, and known hydrophobic resins such as acrylic resins, urethane resins, silicone resins, acrylic urethane resins, polyester resins, cellulose acetate resins, epoxy resins, etc. can be used.
- a hydrophobic resin means a resin having a solubility of less than 1 g in 100 g of water at 25°C. You may use together 2 or more types of hydrophobic resin.
- the protective layer containing the hydrophilic particles and the hydrophobic resin described above is prepared by preparing a protective layer coating solution containing hydrophilic particles, a polyvalent isocyanate compound, and a polyol compound, and applying the protective layer coating solution on the thermosensitive recording layer described above. It is preferable to form the protective layer by coating and drying it, because it is possible to obtain a protective layer that can effectively reduce spouts generated from the surface of the thermosensitive recording material by irradiation with an infrared laser beam.
- Various urethane resins, which are hydrophobic resins, are produced by cross-linking the polyvalent isocyanate compound and the polyol compound.
- the polyvalent isocyanate compound described above is preferably a compound having two or more isocyanate groups in the molecule.
- Isocyanate compounds, aromatic polyvalent isocyanate compounds such as tolylene diisocyanate, 1,3-phenylene diisocyanate, 1,3-dimethylbenzol-2,6-diisocyanate, naphthalene-1,4-diisocyanate, and single or Examples include adducts in which two or more polyvalent isocyanate compounds form dimers or trimers, or adducts in which these polyvalent isocyanate compounds react with divalent or trivalent polyols.
- hexamethylene diisocyanate and its adducts are preferable as the aliphatic polyvalent isocyanate compound
- tolylene diisocyanate and its adducts are preferable as the aromatic polyvalent isocyanate compound.
- These polyvalent isocyanate compounds may be used alone or in combination of two or more for various purposes.
- polyvalent isocyanate compounds such as these products generally sold as isocyanate cross-linking agents can be used as they are.
- the Coronate (registered trademark) series manufactured by Tosoh Corporation can be mentioned.
- the content of the above-mentioned polyvalent isocyanate compound is preferably 59 to 95% by mass with respect to the total solid content of the protective layer coating liquid because the surface of the heat-sensitive recording material has excellent alcohol resistance, and is preferably 59 to 90% by mass. %, more preferably 59 to 80% by mass. If the content of the polyvalent isocyanate compound is less than 59% by mass, the alcohol resistance of the surface of the thermal recording material may be insufficient. Drying time becomes long and productivity may decrease.
- polyol compounds examples include cellulose derivatives such as cellulose acetate, hydroxyethyl cellulose, and hydroxypropyl cellulose, and copolymers of polyhydric alcohols represented by acrylic polyol, polyether polyol, polyester polyol, polycarbonate polyol, and various monomers. etc. These polymer compounds may be used alone or in combination of two or more for various purposes. Among these, it is more preferable to use acrylic polyols.
- Commercially available acrylic polyols include Acrydic (registered trademark) series (manufactured by DIC Corporation) and #6000 series (manufactured by Taisei Fine Chemicals Co., Ltd.). exemplified.
- the protective layer in the present invention preferably contains acrylic urethane resin obtained by reacting acrylic polyol and polyvalent isocyanate.
- the protective layer containing hydrophilic particles and a hydrophobic resin may contain a hydrophilic resin within a range equal to or less than the content of the hydrophobic resin. is 50% by mass or less, and particularly preferably 25% by mass or less of the hydrophilic resin relative to the content of the hydrophobic resin.
- the protective layer containing hydrophilic particles and a hydrophobic resin contains, in addition to the above components, a reducing agent, an ultraviolet absorber, an antioxidant, a silane coupling agent, a dye, a pH adjuster, a surfactant, an antifoaming agent, Known additives such as thickeners, softeners, lubricants and antistatic agents may be contained.
- the protective layer coating liquid used for forming the protective layer containing hydrophilic particles and a hydrophobic resin contains hydrophilic particles, a polyvalent isocyanate compound, a polyol compound, and an additive capable of containing an aromatic and/or protective layer. It is preferably prepared by dissolving or dispersing in a glycol-based volatile component.
- An aromatic volatile component is a volatile component having an aromatic ring, and specific examples thereof include benzene, toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, trimethylbenzene, chlorobenzene, and styrene. be done.
- a glycol-based volatile component is a volatile component having a structure in which two carbon atoms of an aliphatic hydrocarbon having two or more carbon atoms are each bonded to one oxygen atom by a single bond.
- aromatic volatile components it is preferable to use aromatic volatile components, and among them, it is more preferable to use toluene and o-xylene from the viewpoint of obtaining good alcohol resistance.
- These volatile components may be used alone or in combination of two or more volatile components for various purposes.
- a high-speed stirrer such as a homodisper.
- a protective layer containing hydrophilic particles and a hydrophobic resin is formed by applying the protective layer coating solution described above onto the thermosensitive recording layer and drying it.
- the thickness of the protective layer is preferably 2.3-9.4 ⁇ m, more preferably 2.3-6.8 ⁇ m.
- the thickness of the protective layer containing the hydrophilic particles and the hydrophobic resin is less than 2.3 ⁇ m, ejections may occur when the infrared laser beam is irradiated.
- the contrast of an image formed by irradiation with infrared laser light may be lowered.
- the coating amount of the protective layer coating solution can be appropriately adjusted so as to correspond to the thickness of the protective layer described above. 0 to 8.0 g/m 2 is more preferred.
- the thickness of the protective layer As a method for measuring the thickness of the protective layer, a method of actually measuring the cross section of the heat-sensitive recording material by observing it with a scanning electron microscope can be exemplified.
- the thickness of the protective layer is the thickness actually measured at portions other than the convex portions.
- the heat-sensitive recording material of the present invention may further include an easy-adhesion layer and a heat-insulating layer between the light-transmitting support and the infrared-absorbing layer, in addition to the above-described infrared absorbing layer, heat-sensitive recording layer, and protective layer, if necessary.
- an intermediate layer or the like is provided between each layer of the infrared absorbing layer, the thermosensitive recording layer, and the protective layer, an easy peeling layer is provided on the protective layer, the infrared absorbing layer, the thermosensitive recording layer, It is also possible to provide an antistatic layer or the like on the side opposite to the side of the light-transmitting support having the protective layer and the like, but from the viewpoint of obtaining a high-contrast image as described above, the infrared absorbing layer and the heat-sensitive recording layer are Adjacent is preferred.
- An image can be obtained by using the heat-sensitive recording material described above and irradiating an infrared laser beam imagewise from the protective layer side of the heat-sensitive recording material.
- the infrared laser light source include semiconductor lasers, He—Ne lasers, Ar lasers, carbon dioxide lasers, YAG lasers, fiber lasers, and the like.
- the density of the image portion can be changed by changing the energy of the irradiated infrared laser light and the exposure time.
- a thermal CTP setter used for making flexographic printing plates and offset printing plates can be used.
- thermal CTP setters examples include the AURA series (manufactured by Guangzhou Amsky Technology Co Ltd), the Trendsetter (registered trademark) series (manufactured by Eastman Kodak Co.), the Achieve (registered trademark) series (manufactured by Eastman Kodak Co.), and the like. .
- the ultraviolet light transmission density and the Visible light transmission density can be measured.
- the size should be suitable for the light-receiving part of the transmission densitometer, not the part where the image part and the non-image part are mixed in a narrow range such as halftone dots and fine lines in the image part.
- An example of a transmission densitometer capable of measuring the ultraviolet light transmission density and the visible light transmission density is X-Rite (registered trademark) 361T manufactured by X-Rite Co., Ltd. described above.
- the heat-sensitive recording material of the present invention is preferably used as a light-shielding masking material for making a printing plate such as a flexographic printing plate or a screen printing plate, that is, a so-called block copy material.
- a printing plate such as a flexographic printing plate or a screen printing plate
- block copy material such as a photomask in photolithography.
- the present invention is not limited by this description.
- This infrared absorption layer coating solution was applied to a 100 ⁇ m thick PET base (total light transmittance of 92%, haze value of 4%) so that the film thickness after drying was 1.2 ⁇ m, and dried at 50 ° C. to form an infrared absorption layer.
- ⁇ (830) and ⁇ (365) were obtained by measuring the absorption spectrum of a 2-butanone solution of an infrared absorbing dye with a UV-visible spectrophotometer UV-2600 (manufactured by Shimadzu Corporation, using a quartz cell with an optical path length of 1 cm). Measured and calculated.
- This heat-sensitive recording layer coating solution was applied onto the infrared absorption layer already obtained as described above so as to have a silver conversion value of 1.1 g/m 2 and dried at 80°C to form a heat-sensitive recording layer. formed.
- the amount of silver halide contained in the resulting heat-sensitive recording layer was less than 0.1% with respect to the total solid content of the heat-sensitive recording layer.
- Beamset (registered trademark) 3702 manufactured by Arakawa Chemical Industries, Ltd.; a mixture containing an epoxy acrylate polymer, a polyfunctional acrylate compound, and a photopolymerization initiator) as a photocurable resin in 15.0 g of 2-butanone, solid content 59%) was added to obtain 30 g (in which the solid content mass of the binder component was 8.4 g).
- This protective layer coating solution was applied onto the thermosensitive recording layer so that the film thickness after drying was 3.0 ⁇ m, dried at 60° C., and then irradiated with a high-pressure mercury lamp at an irradiation distance of 10 cm and a conveying speed of 5 m/s.
- a heat-sensitive recording material of Example 1 was obtained by curing the protective layer by irradiation under the condition of min.
- Example 2 The preparation and application of the infrared absorbing layer coating solution of Example 1 were carried out in the same manner as in Example 1, except that the infrared absorbing layer coating solution was applied so that the film thickness after drying of the infrared absorbing layer coating solution was 1.5 ⁇ m. to obtain a heat-sensitive recording material of Example 2.
- Example 3 The preparation and application of the infrared absorbing layer coating solution of Example 1 were carried out in the same manner as in Example 1, except that the infrared absorbing layer coating solution was applied so that the film thickness after drying of the infrared absorbing layer coating solution was 1.9 ⁇ m. to obtain a heat-sensitive recording material of Example 3.
- Example 4 In the preparation and application of the protective layer coating solution of Example 1, 9 g of polyvinyl butyral resin (ButvarB-79) was added to 81 g of 2-butanone and 24 g of methanol to prepare a protective layer coating solution. A heat-sensitive recording material of Example 4 was obtained in the same manner as in Example 1 except that the coating was performed so that the film thickness was 1.6 ⁇ m.
- Example 6 In the preparation and application of the infrared absorbing layer coating solution of Example 1, 0.45 g of the exemplary compound (1) was added as an infrared absorbing dye instead of the exemplary compound (5), and the infrared absorbing layer coating solution was dried to a film thickness of 2. A heat-sensitive recording material of Example 6 was obtained in the same manner as in Example 1, except that the layer was coated so as to have a thickness of 0.3 ⁇ m.
- Example 1 was the same as Example 1, except that the coating liquid for the infrared absorbing layer was not applied, and the coating liquid for the thermosensitive recording layer was applied onto a PET base having a thickness of 100 ⁇ m (total light transmittance of 92%, haze value of 4%). A thermal recording material of Comparative Example 1 was obtained in the same manner.
- Example 2 0.045 g of Exemplified Compound (5) was added as an infrared absorbing dye in the preparation and application of the heat-sensitive recording layer coating solution without applying the infrared-absorbing layer coating solution to prepare a heat-sensitive recording layer coating solution.
- a heat-sensitive recording material of Comparative Example 2 was obtained in the same manner as in Example 1 except that the heat-sensitive recording layer coating solution was applied onto a PET base (total light transmittance of 92%, haze value of 4%) having a thickness of 100 ⁇ m.
- Example 3 In Example 1, without coating the coating liquid for the infrared absorbing layer, the coating liquid for the thermosensitive recording layer was coated on a PET base having a thickness of 100 ⁇ m (total light transmittance 92%, haze value 4%). In preparation and coating, 9 g of polyvinyl butyral resin (ButvarB-79) and 0.45 g of Exemplified Compound (5) as an infrared absorbing dye were added to 81 g of 2-butanone and 24 g of methanol to prepare a protective layer coating solution, and the protective layer was coated. A heat-sensitive recording material of Comparative Example 3 was obtained in the same manner as in Example 1 except that the liquid was coated on the heat-sensitive recording layer so that the film thickness after drying was 1.6 ⁇ m.
- the ultraviolet light transmission densities of the filled images and non-image areas of the heat-sensitive recording materials of Examples 1 to 6 and Comparative Examples 1 to 4 were measured using X-Rite (registered trademark) 361T (ultraviolet light mode) manufactured by X-Rite Co., Ltd. measured in Table 1 shows the exposure output value (mW) at which the maximum ultraviolet light transmission density of each thermosensitive recording material was obtained, the ultraviolet light transmission density (Dmax) of the filled image, and the ultraviolet light transmission density (Dmin) of the non-image area. Indicated.
- ⁇ Return performance evaluation> Using the heat-sensitive recording materials of Examples 1 to 6 and Comparative Examples 1 to 4 after the image formation as a mask film, a negative resin plate (Treleaf (registered trademark) MF95DIIJ, thickness 0.95 mm, manufactured by Toray Industries, Inc.) ) was plate-made using a plate-making machine (Takano Processor DX-A4, manufactured by Takano Kikai Seisakusho Co., Ltd.), and the repelling performance of the heat-sensitive recording material was evaluated. Of the 50 micropoints with a diameter of 20 ⁇ m, ⁇ indicates that 49 or more remain on the resin plate after plate making, ⁇ indicates that 30 to 48 remain, and 0 to 29 remain. The evaluation results are shown in Table 1, with X indicating that there is a
- the present invention provides a heat-sensitive recording material capable of obtaining high-contrast images.
- the heat-sensitive recording material of Comparative Example 1 does not have an infrared absorbing layer, the ultraviolet light transmission density (Dmax) of the filled image and the ultraviolet light transmission density (Dmin) of the non-image area are the same.
- the heat-sensitive recording material of Comparative Example 2 since the heat-sensitive recording layer has an infrared absorbing dye, the difference between the ultraviolet light transmission density (Dmax) of the filled image and the ultraviolet light transmission density (Dmin) of the non-image area is small and high. An image with good contrast cannot be obtained, and the return performance is also poor.
- the protective layer since the protective layer has an infrared absorbing dye, the difference between the ultraviolet light transmission density (Dmax) of the solid image and the ultraviolet light transmission density (Dmin) of the non-image area is small and the contrast is high. A good image cannot be obtained, and the return performance is not good.
- the infrared absorbing dye in the infrared absorbing layer has a ratio of ⁇ (830)/ ⁇ (365) of 2.6. The difference in the ultraviolet light transmission density (Dmin) between the two is small, a high-contrast image cannot be obtained, and the repelling performance is also poor.
- the infrared absorption layer coating solution was applied with a small-diameter gravure coater so that the dry mass was 1.5 g/m 2 , It was dried at 50°C to form an infrared absorption layer.
- the number of lines of the gravure roll was 90 lines/inch, the slant angle was 45 degrees, the groove depth was 100 ⁇ m, and the coating speed was 20 m/min.
- a bead mill apparatus (DYNO-MILL KD20B type, Willy ⁇ A silver behenate dispersion liquid (average particle size: 0.6 ⁇ m) was obtained using E. Bakkofen Co., Ltd.).
- thermosensitive recording coating solution On the infrared absorption layer already obtained as described above, this thermosensitive recording coating solution was applied with a die coater so as to have a silver conversion value of 1.3 g/m 2 , dried at 80°C and thermally sensitive. A recording layer was formed. The coating speed was 20 m/min. The amount of silver halide contained in the resulting heat-sensitive recording layer was less than 0.1% with respect to the total solid content of the heat-sensitive recording layer.
- This protective layer coating solution was applied onto the thermosensitive recording layer with a small-diameter gravure coater so that the dry mass was 5.0 g/m 2 , dried at 60° C., and irradiated with a high-pressure mercury lamp.
- the protective layer was cured to obtain a heat-sensitive recording material of Example 7.
- the number of lines of the gravure roll was 90 lines/inch, the line angle was 45 degrees, the groove depth was 100 ⁇ m, and the coating speed was 10 m/min.
- Example 8 In the preparation and application of the coating solution for the infrared absorbing layer of Example 7, the procedure was carried out in the same manner as in Example 7, except that 1.5 parts by mass of 4-tert-butylcatechol was added instead of 4-methylcatechol as a reducing agent. A thermal recording material of Example 8 was obtained.
- Example 9 was prepared in the same manner as in Example 7, except that 1.5 parts by mass of methyl gallate was added as a reducing agent instead of 4-methylcatechol in the preparation and application of the infrared absorbing layer coating solution of Example 7. A heat-sensitive recording material was obtained.
- Example 10 In the preparation and application of the infrared absorbing layer coating solution of Example 7, the same procedure as in Example 7 was repeated except that 1.5 parts by mass of ethyl 3,4-dihydroxybenzoate was added as a reducing agent instead of 4-methylcatechol. to obtain a heat-sensitive recording material of Example 10.
- Example 11 In the preparation and application of the infrared absorbing layer coating solution of Example 7, the coating solution of Example 11 was prepared in the same manner as in Example 7 except that 1.5 parts by mass of ascorbyl palmitate was added as a reducing agent instead of 4-methylcatechol. A heat-sensitive recording material was obtained.
- Example 7 was the same as Example 7, except that the coating liquid for the infrared absorbing layer was not applied, and the coating liquid for the thermosensitive recording layer was applied onto a PET base having a thickness of 100 ⁇ m (total light transmittance of 92%, haze value of 4%). A heat-sensitive recording material of Comparative Example 5 was obtained in the same manner.
- the ultraviolet light transmission densities of the filled images and non-image areas of the heat-sensitive recording materials of Examples 7 to 12 and Comparative Examples 5 to 9 were measured using X-Rite (registered trademark) 361T (ultraviolet light mode) manufactured by X-Rite Co., Ltd. measured in Table 2 shows the exposure output value (mW) at which the maximum ultraviolet light transmission density of each thermosensitive recording material was obtained, the ultraviolet light transmission density (Dmax) of the filled image, and the ultraviolet light transmission density (Dmin) of the non-image area. Indicated.
- ⁇ Return performance evaluation> Using the heat-sensitive recording materials of Examples 7 to 12 and Comparative Examples 5 to 9 after the image formation as a mask film, a negative resin plate (Treleaf (registered trademark) MF95DIIJ, thickness 0.95 mm, manufactured by Toray Industries, Inc.) ) was plate-made using a plate-making machine (Takano Processor DX-A4, manufactured by Takano Kikai Seisakusho Co., Ltd.), and the repelling performance of the heat-sensitive recording material was evaluated. Of the 50 micropoints with a diameter of 20 ⁇ m, ⁇ indicates that 49 or more remain on the resin plate after plate making, ⁇ indicates that 30 to 48 remain, and 0 to 29 remain. The evaluation results are shown in Table 2, with X indicating that there is a failure.
- the heat-sensitive recording material of Comparative Example 5 does not have an infrared absorption layer, the ultraviolet light transmission density (Dmax) of the filled image and the ultraviolet light transmission density (Dmin) of the non-image area are the same, and the number of pinholes generated is Evaluation was not possible.
- the infrared absorbing layer does not contain an infrared absorbing dye, the difference between the ultraviolet light transmission density (Dmax) of the image and the ultraviolet light transmission density (Dmin) of the non-image area is extremely large. It was so small that it was impossible to evaluate the number of pinholes generated.
- the infrared absorption layer did not contain a reducing agent, many pinholes were generated. Furthermore, in the heat-sensitive recording materials of Comparative Examples 8 and 9, since the infrared absorbing dye in the infrared absorbing layer has a ratio of ⁇ (830)/ ⁇ (365) of 2.6, the ultraviolet light transmission density (Dmax) of the filled image is The difference in the ultraviolet light transmission density (Dmin) in the image area is small, and high-contrast images cannot be obtained, and the return performance is also poor.
- the infrared absorption layer coating solution was applied to a 100 ⁇ m thick PET base (total light transmittance of 92%, haze value of 4%) using a wire bar so that the dry mass was 1.0 g/m 2 , It was dried at 60° C. for 1 minute to form an infrared absorption layer.
- the heat-sensitive recording layer coating solution was applied using a wire bar so as to have a silver conversion value of 1.1 g/m 2 , and the temperature was maintained at 80°C for 3 minutes. It was dried to form a thermosensitive recording layer.
- This protective layer coating solution was applied onto the thermosensitive recording layer using a wire bar, dried at 80° C. for 3 minutes, and then heated at 40° C. for 5 days to form a protective layer.
- a heat-sensitive recording material of Example 13 was obtained.
- a cross section of the obtained heat-sensitive recording material of Example 13 was observed with a scanning electron microscope, and the thickness of the protective layer was actually measured to be 4.0 ⁇ m.
- Example 14 Thermal recording of Example 14 in the same manner as in Example 13 except that in the preparation and application of the protective layer coating solution of Example 13, the coating amount of the protective layer coating solution was changed and the thickness of the protective layer was changed to 2.7 ⁇ m. got the material.
- Example 15 Thermal recording of Example 15 in the same manner as in Example 13 except that in the preparation and application of the protective layer coating solution of Example 13, the coating amount of the protective layer coating solution was changed and the thickness of the protective layer was changed to 5.5 ⁇ m. got the material.
- Example 16 Thermal recording of Example 16 in the same manner as in Example 13 except that in the preparation and application of the protective layer coating solution of Example 13, the coating amount of the protective layer coating solution was changed and the thickness of the protective layer was changed to 8.1 ⁇ m. got the material.
- Example 17 In the preparation and application of the protective layer coating solution of Example 13, 0.35 g of Silysia 430 (manufactured by Fuji Silysia Chemical; hydrophilic silica particles, average particle size 4.1 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 17 was obtained in the same manner as in Example 13. The thickness of the protective layer was 4.0 ⁇ m.
- Example 18 In the preparation and application of the protective layer coating solution of Example 13, 0.35 g of Silysia 450 (manufactured by Fuji Silysia Chemical; hydrophilic silica particles, average particle size 8.0 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 18 was obtained in the same manner as in Example 13. The thickness of the protective layer was 4.2 ⁇ m.
- Example 19 In the preparation and application of the protective layer coating solution of Example 13, 0.35 g of Sunsphere NP-30 (manufactured by AGC Si Tech; hydrophilic silica particles, average particle size 4.0 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 19 was obtained in the same manner as in Example 13 except for the above. The thickness of the protective layer was 4.0 ⁇ m.
- Example 20 In the preparation and application of the protective layer coating solution of Example 13, 0.35 g of Sunsphere H-121 (manufactured by AGC Si Tech; hydrophilic silica particles, average particle size 12 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 20 was obtained in the same manner as in Example 13. The thickness of the protective layer was 4.9 ⁇ m.
- Example 21 In the preparation and application of the protective layer coating solution of Example 13, instead of Seahoster KE-P250, organosilica sol IPA-ST-ZL (Nissan Chemical; 2-propanol dispersion of hydrophilic silica particles, solid content 30% by mass, A heat-sensitive recording material of Example 21 was obtained in the same manner as in Example 13, except that 0.35 g of a solid content of 0.08 ⁇ m average particle diameter was added. The thickness of the protective layer was 3.8 ⁇ m.
- Example 22 In the preparation and application of the protective layer coating solution of Example 13, except that 0.35 g of fine alumina SA31B (manufactured by Nippon Light Metal; hydrophilic alumina particles, average particle size 4.0 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 22 was obtained in the same manner as in Example 13. The thickness of the protective layer was 4.0 ⁇ m.
- Example 23 Example 13 except that 0.35 g of Chemisnow MX500 (manufactured by Soken Kagaku; hydrophilic acrylic particles, average particle size 5.0 ⁇ m) was added instead of Seahoster KE-P250 in the preparation and application of the protective layer coating solution of Example 13.
- a heat-sensitive recording material of Example 23 was obtained in the same manner as in Example 13.
- the thickness of the protective layer was 4.1 ⁇ m.
- Example 24 In the preparation and application of the protective layer coating solution of Example 13, except that 0.35 g of Optobeads 3500M (Nissan Chemical; hydrophilic melamine particles, average particle size 3.5 ⁇ m) was added instead of Seahoster KE-P250. A heat-sensitive recording material of Example 24 was obtained in the same manner as in Example 13. The thickness of the protective layer was 4.0 ⁇ m.
- Example 25 In Example 13, 1.0 g of cellulose acetate resin was dissolved in 9.0 g of 2-butanone, 0.025 g of Seahoster KE-P250 was added, and the mixture was further stirred to homogenize the whole to obtain a protective layer coating solution.
- a heat-sensitive recording material of Example 25 was prepared in the same manner as in Example 13 except that the protective layer coating solution was applied onto the above-mentioned heat-sensitive recording layer using a wire bar and dried at 80°C for 3 minutes to form a protective layer. Obtained. The thickness of the protective layer was 3.7 ⁇ m.
- Example 26 ⁇ Example 26>
- 1.0 g of Acrydic WDL-787 manufactured by DIC Corporation; acrylic resin solution, solid content 40% by mass
- Seahoster KE-P250 was added.
- 0.025 g was added and further stirred to homogenize the whole to obtain a protective layer coating solution.
- This protective layer coating solution was applied onto the thermosensitive recording layer using a wire bar and dried at 80°C for 3 minutes.
- a heat-sensitive recording material of Example 26 was obtained in the same manner as in Example 13 except that a protective layer was formed. The thickness of the protective layer was 3.8 ⁇ m.
- Example 27 A heat-sensitive recording material of Example 27 was obtained in the same manner as in Example 13 except that 0.27 g of Seahoster KE-P250 was added in the preparation and coating of the protective layer coating solution of Example 13. The thickness of the protective layer was 4.0 ⁇ m.
- Example 28 A heat-sensitive recording material of Example 28 was obtained in the same manner as in Example 13 except that 0.22 g of Seahoster KE-P250 was added in the preparation and coating of the protective layer coating solution of Example 13. The thickness of the protective layer was 4.1 ⁇ m.
- Example 29 A heat-sensitive recording material of Example 29 was obtained in the same manner as in Example 13 except that 0.15 g of Seahoster KE-P250 was added in the preparation and coating of the protective layer coating solution of Example 13. The thickness of the protective layer was 4.0 ⁇ m.
- Example 13 1.0 of Kuraray Poval 60-80 (manufactured by Kuraray Co., Ltd.; polyvinyl alcohol, hydrophilic resin) was dissolved in 18.0 g of water, and 0.025 g of Seahoster KE-P250 was added and further stirred. After homogenizing the whole, 0.05 g of boric acid was added while stirring to obtain a protective layer coating solution.
- a heat-sensitive recording material of Comparative Example 13 was obtained in the same manner as in Example 13 except that the protective layer was formed by drying for 3 minutes. The thickness of the protective layer was 4.0 ⁇ m.
- Comparative Example 14 A heat-sensitive recording material of Comparative Example 14 was obtained in the same manner as in Example 13 except that Seahoster KE-P was not added in the preparation and application of the protective layer coating solution of Example 13. The thickness of the protective layer was 3.9 ⁇ m.
- the ultraviolet light transmission densities of the filled images and non-image areas of the heat-sensitive recording materials of Examples 13 to 30 and Comparative Examples 10 to 15 were measured using X-Rite (registered trademark) 361T (ultraviolet light mode) manufactured by X-Rite Co., Ltd. to obtain the ultraviolet light transmission density (Dmax) of the filled image and the ultraviolet light transmission density (Dmin) of the non-image area.
- Table 3 shows the calculation result of "Dmax-Dmin", which is the difference between Dmax and Dmin.
- the present invention reduces ejecta generated from the surface of the thermosensitive recording material by irradiation with an infrared laser beam, and provides a thermosensitive recording material capable of obtaining a high-contrast image.
- the infrared absorbing dye in the infrared absorbing layer has a ratio of ⁇ (830)/ ⁇ (365) of 2.6. The difference in ultraviolet light transmission density (Dmin) between the two is small, and a high-contrast image cannot be obtained.
- the heat-sensitive recording layer coating solution was applied using a wire bar so as to have a silver conversion value of 1.1 g/m 2 , and the temperature was maintained at 80°C for 3 minutes. It was dried to form a thermosensitive recording layer.
- This protective layer coating solution was applied onto the thermosensitive recording layer using a wire bar so that the dry mass was 1.5 g/m 2 , dried at 80°C for 3 minutes, and then heated at 40°C for 5 days. It was warmed to form a protective layer. Thus, a heat-sensitive recording material of Example 31 was obtained.
- Example 32 A heat-sensitive recording material of Example 32 was prepared in the same manner as in Example 31 except that the amount of fumaric acid added in the preparation and application of the heat-sensitive recording layer coating solution of Example 31 was changed to 1.2 g to obtain a heat-sensitive recording layer coating solution. Obtained.
- Example 33 The heat-sensitive recording layer coating solution of Example 33 was prepared in the same manner as in Example 31, except that 0.57 g of isophthalic acid was added instead of fumaric acid in the preparation and application of the heat-sensitive recording layer coating solution of Example 31. A recording material was obtained.
- Example 31 was repeated in the same manner as in Example 31, except that 0.63 g of 4-hydroxyisophthalic acid was added instead of fumaric acid in the preparation and application of the heat-sensitive recording layer coating solution to obtain a heat-sensitive recording layer coating solution. 34 thermal recording materials were obtained.
- Example 31 was prepared in the same manner as in Example 31, except that 0.68 g of 5-methoxyisophthalic acid was added instead of fumaric acid to obtain a heat-sensitive recording layer coating solution. 35 thermal recording materials were obtained.
- Example 31 was repeated in the same manner as in Example 31, except that 0.62 g of 2-methylterephthalic acid was added in place of fumaric acid in the preparation and application of the heat-sensitive recording layer coating solution of Example 31 to obtain a heat-sensitive recording layer coating solution. 36 thermal recording materials were obtained.
- Example 37 The heat-sensitive recording layer coating solution of Example 37 was prepared in the same manner as in Example 31 except that 0.41 g of succinic acid was added in place of fumaric acid in the preparation and application of the heat-sensitive recording layer coating solution of Example 31 to obtain a heat-sensitive recording layer coating solution. A recording material was obtained.
- Example 38 The thermal recording layer coating solution of Example 31 was prepared and applied in the same manner as in Example 31 except that 0.50 g of adipic acid was added instead of fumaric acid to obtain a thermal recording layer coating solution. A recording material was obtained.
- Example 39 The heat-sensitive recording layer coating solution of Example 39 was prepared in the same manner as in Example 31 except that 0.60 g of suberic acid was added instead of fumaric acid in the preparation and application of the heat-sensitive recording layer coating solution of Example 31. A recording material was obtained.
- Example 40 In the preparation and application of the heat-sensitive recording layer coating solution of Example 31, in addition to 0.40 g of fumaric acid, 0.57 g of isophthalic acid was further added to obtain a heat-sensitive recording layer coating solution in the same manner as in Example 31. A heat-sensitive recording material of Example 40 was obtained.
- the ultraviolet light transmission density (Dmax) of the filled image and the ultraviolet light of the non-image area Tables 4 and 5 show the difference "Dmax-Dmin” from the transmission density (Dmin), and the ultraviolet light transmission density and visible light transmission density at laser outputs of 200 mW, 240 mW, 300 mW and 400 mW.
- a thermal recording material with a "Dmax-Dmin" value of 3.00 or more is defined as a thermal recording material capable of obtaining a high-contrast image.
- the ultraviolet light transmission density (Dmax) of the image obtained by the heat-sensitive recording material used in advance at the manufacturer of the heat-sensitive recording material and the non-image area is specified.
- the user of the thermal recording material can grasping the visible light transmission density when the value of "Dmax-Dmin", which is the difference in ultraviolet light transmission density (Dmin), is 3.0 or more.
- a method of adjusting and optimizing the irradiation amount of the infrared laser light so as to obtain the light transmission density can be exemplified. In this method, it is necessary that the ultraviolet light transmission density increases and the visible light transmission density increases with a significant difference as the irradiation amount of the infrared laser light increases.
- the difference in visible light transmission density between laser outputs of 240 mW and 200 mW and the difference in visible light transmission density between laser outputs of 300 mW and 240 mW are both 0.1 or more, and the laser output is 400 mW. and the difference in visible light transmission density at 300 mW is 0.2 or more. bottom.
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Abstract
Description
第1の目的は、「光透過性支持体上に、830nmにおけるモル吸光係数ε(830)と、365nmにおけるモル吸光係数ε(365)の比ε(830)/ε(365)が4.0以上の赤外線吸収色素を含有する赤外線吸収層、非感光性の有機銀塩を含有し、且つ、感光性のハロゲン化銀を実質的に含有しない感熱記録層、および保護層とを少なくともこの順に有する感熱記録材料」である第1の発明により解決される。
第2の目的は、第1の発明の感熱記録材料の赤外線吸収層が更に還元剤を含有する第2の発明により解決される。
第3の目的は、第1の発明の感熱記録材料の保護層が親水性粒子と疎水性樹脂を含有し、該保護層の厚みが2.3~9.4μmである第3の発明により解決される。
第4の目的は、「光透過性支持体上に、該光透過性支持体に近い側から赤外線吸収色素を含有する赤外線吸収層と、非感光性の有機銀塩と還元剤及び一般式(1)~(4)で示される化合物の群から選ばれる少なくとも1種の化合物を含有する感熱記録層と、保護層とを少なくともこの順に有する感熱記録材料」である第4の発明により解決される。
2-ブタノン81g、メタノール24gに、ポリビニルブチラール樹脂(Butvar(登録商標)B-79、イーストマンケミカルジャパン(株)製)9.0g、赤外線吸収色素として例示化合物(5)(昭和電工(株)製IRT、ε(830)/ε(365)=6.2)0.45gを加えて赤外線吸収層塗布液を得た。厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に、この赤外線吸収層塗布液を乾燥後の膜厚が1.2μmとなるように塗布し、50℃にて乾燥させて赤外線吸収層を形成した。なお、ε(830)およびε(365)は、赤外線吸収色素の2-ブタノン溶液の吸収スペクトルを紫外可視分光光度計UV-2600((株)島津製作所製、光路長1cmの石英セル使用)によって測定して算出した。
ベヘン酸銀結晶20g、ポリビニルブチラール樹脂(ButvarB-79)22gを175gの2-ブタノンに加え、直径0.65mmのジルコニアビーズを充填したビーズミル装置(DYNO-MILL KD20B型、ウィリー・エ・バッコーフェン社製)を用いてベヘン酸銀分散液(平均粒子径0.6μm)を得た。
2-ブタノン45gに、ポリビニルブチラール樹脂(ButvarB-79)2.4g、上記したベヘン酸銀分散液30g、還元剤として3,4-ジヒドロキシ安息香酸エチル1.5g、テトラクロロフタル酸無水物0.6g、フタラゾン1.2gを加えて感熱記録層塗布液を得た。上記のようにして既に得られた赤外線吸収層上に、この感熱記録層塗布液を銀換算値として1.1g/m2となるように塗布し、80℃にて乾燥させて感熱記録層を形成した。なお、得られた感熱記録層中に含有されるハロゲン化銀は感熱記録層の全固形分量に対して0.1%未満であった。
2-ブタノン15.0gに、光硬化性樹脂としてビームセット(登録商標)3702(荒川化学工業(株)製;エポキシアクリレートポリマー、多官能アクリレート化合物、および光重合開始剤を含む混合物、固形分率59%)15.0gを加え、30g(うち、バインダー成分の固形分質量は8.4g)の保護層塗布液を得た。この保護層塗布液を上記感熱記録層上に、乾燥後の膜厚が3.0μmとなるように塗布し、60℃にて乾燥させたのち、高圧水銀ランプを照射距離10cm、搬送速度5m/minの条件で照射して保護層を硬化させ、実施例1の感熱記録材料を得た。
実施例1の赤外線吸収層塗布液の調製および塗布において、赤外線吸収層塗布液の乾燥後の膜厚が1.5μmとなるように赤外線吸収層塗布液を塗布した以外は実施例1と同様にして実施例2の感熱記録材料を得た。
実施例1の赤外線吸収層塗布液の調製および塗布において、赤外線吸収層塗布液の乾燥後の膜厚が1.9μmとなるように赤外線吸収層塗布液を塗布した以外は実施例1と同様にして実施例3の感熱記録材料を得た。
実施例1の保護層塗布液の調製および塗布において、2-ブタノン81g、メタノール24gに、ポリビニルブチラール樹脂(ButvarB-79)9gを加えて保護層塗布液を作製し、保護層塗布液の乾燥後膜厚が1.6μmとなるように塗布した以外は実施例1と同様にして実施例4の感熱記録材料を得た。
実施例1の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりに例示化合物(1)(ε(830)/ε(365)=18.5)を0.45g加え、赤外線吸収層塗布液を乾燥後膜厚が1.5μmとなるように塗布した以外は実施例1と同様にして実施例5の感熱記録材料を得た。
実施例1の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりに例示化合物(1)を0.45g加え、赤外線吸収層塗布液を乾燥後膜厚が2.3μmとなるように塗布した以外は実施例1と同様にして実施例6の感熱記録材料を得た。
実施例1において、赤外線吸収層塗布液を塗布せず、感熱記録層塗布液を厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に塗布した以外は実施例1と同様にして比較例1の感熱記録材料を得た。
実施例1において、赤外線吸収層塗布液を塗布せず、感熱記録層塗布液の調製および塗布において赤外線吸収色素として例示化合物(5)を0.045g加えて感熱記録層塗布液を作製し、該感熱記録層塗布液を厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に塗布した以外は実施例1と同様にして比較例2の感熱記録材料を得た。
実施例1において、赤外線吸収層塗布液を塗布せず、感熱記録層塗布液を厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に塗布し、保護層塗布液の調製および塗布において2-ブタノン81g、メタノール24gに、ポリビニルブチラール樹脂(ButvarB-79)9g、赤外線吸収色素として例示化合物(5)を0.45g加えて保護層塗布液を作製し、該保護層塗布液を乾燥後膜厚が1.6μmとなるように感熱記録層上に塗布した以外は実施例1と同様にして比較例3の感熱記録材料を得た。
実施例1の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりにIX-2-IR-14(日本触媒(株)製、フタロシアニン系色素、ε(830)/ε(365)=2.6)を0.07g加えた以外は実施例1と同様にして比較例4の感熱記録材料を得た。
このようにして得られた実施例1~6および比較例1~4の感熱記録材料をサーマルCTPセッター(Guangzhou Amsky Technology Co Ltd製、AURA600E)により、ドラム回転数300rpm、露光出力200mW~800mWの範囲で変更しながら、直径20μmの微小点50個(ネガ画像)および塗りつぶし部分を有する画像(20mm(幅)×200mm(長さ))を形成した。
上記画像形成後の実施例1~6および比較例1~4の感熱記録材料の塗りつぶし画像および非画像部の紫外光透過濃度をエックスライト社製X-Rite(登録商標)361T(紫外光モード)で測定した。それぞれの感熱記録材料の紫外光最大透過濃度が得られた際の露光出力値(mW)、塗りつぶし画像の紫外光透過濃度(Dmax)および非画像部の紫外光透過濃度(Dmin)を表1に示した。
上記画像形成後の実施例1~6および比較例1~4の感熱記録材料をマスクフィルムとして用いて、ネガ型の樹脂版(トレリーフ(登録商標)MF95DIIJ、厚み0.95mm、東レ(株)製)を製版機((株)タカノ機械製作所製、Takano Processer DX-A4)を用いて製版し、感熱記録材料の返し性能を評価した。上記した直径20μmの微小点50個のうち、製版後の樹脂版上に49個以上が残存しているものを〇、30~48個が残存しているものを△、0~29個が残存しているものを×として評価結果を表1に示した。
また、比較例2の感熱記録材料は、感熱記録層が赤外線吸収色素を有するので、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られず、返し性能も悪い。
さらに、比較例3の感熱記録材料は、保護層が赤外線吸収色素を有するので、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られず、返し性能も良くない。
そして、比較例4の感熱記録材料は、赤外線吸収層の赤外線吸収色素のε(830)/ε(365)が2.6であるから、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られず、返し性能も良くない。
2-ブタノン81質量部、メタノール24質量部に、ポリビニルブチラール樹脂(Butvar(登録商標)B-79、イーストマンケミカルジャパン(株)製)9.0質量部、赤外線吸収色素として例示化合物(5)(昭和電工(株)製IRT、ε(830)/ε(365)=6.2)0.45質量部、還元剤として4-メチルカテコールを1.5質量部加えて赤外線吸収層塗布液を得た。厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に、この赤外線吸収層塗布液を乾燥質量が1.5g/m2となるように小径グラビアコーターにて塗布し、50℃にて乾燥させて赤外線吸収層を形成した。グラビアロールの線数は90線/インチ、斜線角度45度、溝深さは100μmであり、塗速は20m/分とした。
ベヘン酸銀結晶20質量部、ポリビニルブチラール樹脂(ButvarB-79)22質量部を175質量部の2-ブタノンに加え、直径0.65mmのジルコニアビーズを充填したビーズミル装置(DYNO-MILL KD20B型、ウィリー・エ・バッコーフェン社製)を用いてベヘン酸銀分散液(平均粒子径0.6μm)を得た。
2-ブタノン45質量部に、ポリビニルブチラール樹脂(ButvarB-79)2.4質量部、上記したベヘン酸銀分散液30質量部、還元剤として3,4-ジヒドロキシ安息香酸エチル1.5質量部、テトラクロロフタル酸無水物0.6質量部、フタラゾン1.2質量部を加えて感熱記録層塗布液を得た。上記のようにして既に得られた赤外線吸収層上に、この感熱記録塗布液を銀換算値として1.3g/m2となるようにダイコーターにて塗布し、80℃にて乾燥させて感熱記録層を形成した。塗速は20m/分とした。なお、得られた感熱記録層中に含有されるハロゲン化銀は感熱記録層の全固形分量に対して0.1%未満であった。
2-ブタノン15.0質量部に、光硬化性樹脂としてビームセット(登録商標)3702(荒川化学工業(株)製;エポキシアクリレートポリマー、多官能アクリレート化合物、および光重合開始剤を含む混合物、固形分率59%)15.0質量部を加えて30質量部(うち、バインダー成分の固形分質量は8.4質量部)の保護層塗布液を得た。この保護層塗布液を上記感熱記録層上に、乾燥質量が5.0g/m2となるように小径グラビアコーターにて塗布し、60℃にて乾燥させたのち、高圧水銀ランプを照射して保護層を硬化させ、実施例7の感熱記録材料を得た。グラビアロールの線数は90線/インチ、斜線角度45度、溝深さは100μmであり、塗速は10m/分とした。
実施例7の赤外線吸収層塗布液の調製および塗布において、還元剤として、4-メチルカテコールの代わりに4-tert-ブチルカテコールを1.5質量部加えた以外は実施例7と同様にして実施例8の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、還元剤として、4-メチルカテコールの代わりに没食子酸メチルを1.5質量部加えた以外は実施例7と同様にして実施例9の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、還元剤として、4-メチルカテコールの代わりに3,4-ジヒドロキシ安息香酸エチルを1.5質量部加えた以外は実施例7と同様にして実施例10の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、還元剤として、4-メチルカテコールの代わりにパルミチン酸アスコルビルを1.5質量部加えた以外は実施例7と同様にして実施例11の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりに例示化合物(1)(ε(830)/ε(365)=18.5)を0.45質量部加えた以外は実施例7と同様にして実施例12の感熱記録材料を得た。
実施例7において、赤外線吸収層塗布液を塗布せず、感熱記録層塗布液を厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に塗布した以外は実施例7と同様にして比較例5の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素を加えなかった以外は実施例7と同様にして比較例6の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、還元剤を加えなかった以外は実施例7と同様にして比較例7の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりにIX-2-IR-14(日本触媒(株)製、フタロシアニン系色素、ε(830)/ε(365)=2.6)を0.07質量部加え、かつ還元剤を加えなかった以外は実施例7と同様にして比較例8の感熱記録材料を得た。
実施例7の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりにIX-2-IR-14(日本触媒(株)製、フタロシアニン系色素、ε(830)/ε(365)=2.6)を0.07質量部加えた以外は実施例7と同様にして比較例9の感熱記録材料を得た。
このようにして得られた実施例7~12および比較例5~9の感熱記録材料をサーマルCTPセッター(Guangzhou Amsky Technology Co Ltd製、AURA600E)により、ドラム回転数300rpm、露光出力200mW~800mWの範囲で変更しながら、直径20μmの微小点50個(ネガ画像)および塗りつぶし画像(200mm(幅)×200mm(長さ)、10セット)を形成した。
上記画像形成後の実施例7~12および比較例5~9の感熱記録材料の塗りつぶし画像および非画像部の紫外光透過濃度をエックスライト社製X-Rite(登録商標)361T(紫外光モード)で測定した。それぞれの感熱記録材料の紫外光最大透過濃度が得られた際の露光出力値(mW)、塗りつぶし画像の紫外光透過濃度(Dmax)および非画像部の紫外光透過濃度(Dmin)を表2に示した。
上記画像形成後の実施例7~12および比較例5~9の感熱記録材料をマスクフィルムとして用いて、ネガ型の樹脂版(トレリーフ(登録商標)MF95DIIJ、厚み0.95mm、東レ(株)製)を製版機((株)タカノ機械製作所製、Takano Processer DX-A4)を用いて製版し、感熱記録材料の返し性能を評価した。上記した直径20μmの微小点50個のうち、製版後の樹脂版上に49個以上が残存しているものを○、30~48個が残存しているものを△、0~29個が残存しているものを×として評価結果を表2に示した。
上記画像形成後の実施例7~12および比較例5~9の感熱記録材料をライトテーブルに載せ、塗りつぶし画像(各10セット)にて視認できるピンホールを数えた。ピンホールが0~2個のものを良、3~7個のものを可、8個以上を不可として評価結果を表2に示した。
また、比較例6の感熱記録材料は、赤外線吸収層が赤外線吸収色素を含有していないので、画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が極めて小さく、ピンホール発生数の評価が不可能であった。
また、比較例7の感熱記録材料は、赤外線吸収層が還元剤を含有していないので、ピンホールの発生が多かった。
さらに、比較例8と9の感熱記録材料は、赤外線吸収層の赤外線吸収色素のε(830)/ε(365)が2.6であるから、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られず、返し性能も良くない。
2-ブタノン81.0g、メタノール24.0gに、ポリビニルブチラール(Butvar(登録商標)B-79、イーストマンケミカルジャパン(株)製)9.0g、赤外線吸収色素として例示化合物(5)(昭和電工(株)製IRT、ε(830)/ε(365)=6.2)0.45gを加えて赤外線吸収層塗布液を得た。厚さ100μmのPETベース(全光線透過率92%、ヘーズ値4%)上に、この赤外線吸収層塗布液を乾燥質量が1.0g/m2となるようにワイヤーバーを用いて塗布し、60℃にて1分間乾燥させて赤外線吸収層を形成した。
ベヘン酸銀結晶20.0g、ポリビニルブチラール(ButvarB-79)22gを175gの2-ブタノンに加え、直径0.65mmのジルコニアビーズを充填したビーズミル装置(DYNO-MILL KD20B型、ウィリー・エ・バッコーフェン社製)を用いてベヘン酸銀分散液(平均粒子径0.8μm)を得た。
2-ブタノン45.0gに、ポリビニルブチラール(ButvarB-79)4.2g、上記したベヘン酸銀分散液91.2g、還元剤として3,4-ジヒドロキシ安息香酸エチル5.0g、テトラクロロフタル酸無水物0.1g、フタラゾン1.9gを加えて感熱記録層塗布液を得た。上記のようにして既に得られた赤外線吸収層上に、この感熱記録層塗布液を銀換算値として1.1g/m2となるようにワイヤーバーを用いて塗布し、80℃にて3分間乾燥させて感熱記録層を形成した。
トルエン25.7gに、アクリディックWBU-1218(DIC(株)製;アクリルポリオール溶液、固形分30質量%)15.2g、シーホスターKE-P250(日本触媒(株)製;親水性シリカ粒子、平均粒子径2.5μm)0.35gを加え、撹拌して全体を均一にした後、撹拌しながらコロネート2715(東ソー(株)製;ポリイソシアネート変性体溶液、固形分90質量%)12gを加えて保護層塗布液を得た。この保護層塗布液を上記感熱記録層上にワイヤーバーを用いて塗布し、80℃にて3分間乾燥させたのち40℃にて5日間加温して保護層を形成した。このようにして実施例13の感熱記録材料を得た。得られた実施例13の感熱記録材料の断面を走査型電子顕微鏡で観察し、保護層の厚みを実測した結果、4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、保護層塗布液の塗布量を変更し、保護層の厚みを2.7μmとした以外は実施例13と同様にして実施例14の感熱記録材料を得た。
実施例13の保護層塗布液の調製および塗布において、保護層塗布液の塗布量を変更し、保護層の厚みを5.5μmとした以外は実施例13と同様にして実施例15の感熱記録材料を得た。
実施例13の保護層塗布液の調製および塗布において、保護層塗布液の塗布量を変更し、保護層の厚みを8.1μmとした以外は実施例13と同様にして実施例16の感熱記録材料を得た。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにサイリシア430(富士シリシア化学製;親水性シリカ粒子、平均粒子径4.1μm)を0.35g加えた以外は実施例13と同様にして実施例17の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにサイリシア450(富士シリシア化学製;親水性シリカ粒子、平均粒子径8.0μm)を0.35g加えた以外は実施例13と同様にして実施例18の感熱記録材料を得た。保護層の厚みは4.2μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにサンスフェアNP-30(AGCエスアイテック製;親水性シリカ粒子、平均粒子径4.0μm)を0.35g加えた以外は実施例13と同様にして実施例19の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにサンスフェアH-121(AGCエスアイテック製;親水性シリカ粒子、平均粒子径12μm)を0.35g加えた以外は実施例13と同様にして実施例20の感熱記録材料を得た。保護層の厚みは4.9μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにオルガノシリカゾルIPA-ST-ZL(日産化学製;親水性シリカ粒子の2-プロパノール分散液、固形分30質量%、平均粒子径0.08μm)を固形分として0.35g加えた以外は実施例13と同様にして実施例21の感熱記録材料を得た。保護層の厚みは3.8μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりに微粒アルミナSA31B(日本軽金属製;親水性アルミナ粒子、平均粒子径4.0μm)を0.35g加えた以外は実施例13と同様にして実施例22の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにケミスノーMX500(綜研化学製;親水性アクリル粒子、平均粒子径5.0μm)を0.35g加えた以外は実施例13と同様にして実施例23の感熱記録材料を得た。保護層の厚みは4.1μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにオプトビーズ3500M(日産化学製;親水性メラミン粒子、平均粒子径3.5μm)を0.35g加えた以外は実施例13と同様にして実施例24の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13において、2-ブタノン9.0gに、酢酸セルロース樹脂1.0gを溶解させ、シーホスターKE-P250を0.025g加えてさらに撹拌し、全体を均一にして保護層塗布液を得、この保護層塗布液を上記感熱記録層上にワイヤーバーを用いて塗布し、80℃にて3分間乾燥させて保護層を形成した以外は実施例13と同様にして実施例25の感熱記録材料を得た。保護層の厚みは3.7μmであった。
実施例13において、2-ブタノン9.0gに、アクリディックWDL-787(DIC(株)製;アクリル樹脂溶液、固形分40質量%)を固形分で1.0g溶解させ、シーホスターKE-P250を0.025g加えてさらに撹拌し、全体を均一にして保護層塗布液を得、この保護層塗布液を上記感熱記録層上にワイヤーバーを用いて塗布し、80℃にて3分間乾燥させて保護層を形成した以外は実施例13と同様にして実施例26の感熱記録材料を得た。保護層の厚みは3.8μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250を0.27g加えた以外は実施例13と同様にして実施例27の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250を0.22g加えた以外は実施例13と同様にして実施例28の感熱記録材料を得た。保護層の厚みは4.1μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250を0.15g加えた以外は実施例13と同様にして実施例29の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の赤外線吸収層塗布液の調製において、赤外線吸収色素として例示化合物(5)の代わりに例示化合物(1)(ε(830)/ε(365)=18.5)を0.45g加えた以外は実施例13と同様にして実施例30の感熱記録材料を得た。保護層の厚みは3.9μmであった。
実施例13の保護層塗布液の調製および塗布において、保護層塗布液の塗布量を変更し、保護層の厚みを1.9μmとした以外は実施例13と同様にして比較例10の感熱記録材料を得た。
実施例13の保護層塗布液の調製および塗布において、保護層塗布液の塗布量を変更し、保護層の厚みを10.7μmとした以外は実施例13と同様にして比較例11の感熱記録材料を得た。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-P250の代わりにサイロホービック(登録商標)200(富士シリシア化学製;疎水性シリカ粒子、平均粒子径3.9μm)を0.35g加えた以外は実施例13と同様にして比較例12の感熱記録材料を得た。保護層の厚みは3.9μmであった。
実施例13において、水18.0gに、クラレポバール60-80((株)クラレ製;ポリビニルアルコール、親水性樹脂)1.0を溶解させ、シーホスターKE-P250を0.025g加えてさらに撹拌し、全体を均一にした後、撹拌しながらホウ酸0.05gを加えて保護層塗布液を得、この保護層塗布液を上記感熱記録層上にワイヤーバーを用いて塗布し、80℃にて3分間乾燥させて保護層を形成した以外は実施例13と同様にして比較例13の感熱記録材料を得た。保護層の厚みは4.0μmであった。
実施例13の保護層塗布液の調製および塗布において、シーホスターKE-Pを加えなかった以外は実施例13と同様にして比較例14の感熱記録材料を得た。保護層の厚みは3.9μmであった。
実施例13の赤外線吸収層塗布液の調製および塗布において、赤外線吸収色素として例示化合物(5)の代わりに、IX-2-IR-14(日本触媒(株)製、ε(830)/ε(365)=2.6)を0.07g加えた以外は実施例13と同様にして比較例15の感熱記録材料を得た。保護層の厚みは3.9μmであった。
このようにして得られた実施例13~30および比較例10~15の感熱記録材料を、サーマルCTPセッター(Guangzhou Amsky Technology Co Ltd製、AURA600E)を用いて赤外線レーザー光で露光し、4000dpiの塗りつぶし画像(20mm(幅)×200mm(長さ))を得た。サーマルCTPセッターのドラム回転数は300rpmに固定し、レーザー出力は300mWとした。
上記画像形成後の実施例13~30および比較例10~15の感熱記録材料の塗りつぶし画像および非画像部の紫外光透過濃度をエックスライト社製X-Rite(登録商標)361T(紫外光モード)で測定し、塗りつぶし画像の紫外光透過濃度(Dmax)および非画像部の紫外光透過濃度(Dmin)を得た。DmaxとDminの差である「Dmax-Dmin」の算出結果を表3に示す。
上記画像形成後の実施例13~30および比較例10~15の感熱記録材料における画像部の周辺を目視および顕微鏡(50倍)で観察し、画像部周囲に噴出部による汚染が見られるか否かを調べた。以下の噴出物基準で判断した結果を表3に示す。
優:噴出物による汚染が全く見られない
良:画像部周囲に噴出物が極僅かに見られる(目視では見えず顕微鏡観察で見える)
可:画像部周囲に噴出物が目視で見えるが実用上の問題は無い
不可:画像部周囲に噴出物が多量に降り積もっており、実用不可
また、比較例11の感熱記録材料は、保護層の厚みが大きいので、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られない。
また、比較例12の感熱記録材料は、保護層が親水性シリカ粒子を含有せず、疎水性シリカ粒子と疎水性樹脂を含有しているので、画像部周囲に多量の噴出物が発生した。
また、比較例13の感熱記録材料は、保護層が疎水性樹脂を含有せず、親水性シリカ粒子と親水性樹脂を含有しているので、画像部周囲に多量の噴出物が発生した。
さらに、比較例14の感熱記録材料は、保護層が親水性シリカ粒子を含有せず、疎水性樹脂のみを含有しているので、画像部周囲に多量の噴出物が発生した。
そして、比較例15の感熱記録材料は、赤外線吸収層の赤外線吸収色素のε(830)/ε(365)が2.6であるから、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)の差が小さくて高コントラストな画像が得られない。
2-ブタノン81.0g、メタノール24.0gに、ポリビニルブチラール(Butvar(登録商標)B-79、イーストマンケミカルジャパン(株)製)9.0g、赤外線吸収色素として例示化合物(5)(昭和電工(株)製IRT、ε1/ε2=6.2)0.45gを加えて赤外線吸収層塗布液を得た。厚さ100μmのポリエチレンテレフタレートフィルムベース(全光線透過率92%、ヘーズ値4%)上に、この赤外線吸収層塗布液を乾燥質量が1.0g/m2となるようにワイヤーバーを用いて塗布し、60℃にて1分間乾燥させて赤外線吸収層を形成した。
ベヘン酸銀結晶20.0g、ポリビニルブチラール(ButvarB-79)22.0gを175gの2-ブタノンに加え、得られた混合物を直径0.65mmのジルコニアビーズを充填したビーズミル装置(DYNO-MILL KD20B型、ウィリー・エ・バッコーフェン社製)を用いて分散し、ベヘン酸銀分散液(平均粒子径0.8μm)を得た。
2-ブタノン45.0gに、ポリビニルブチラール(ButvarB-79)4.2g、上記したベヘン酸銀分散液91.2g、還元剤として3,4-ジヒドロキシ安息香酸エチル5.0g、テトラクロロフタル酸無水物0.1g、フタラゾン1.9g、フマル酸0.40gを加えて感熱記録層塗布液を得た。上記のようにして既に得られた赤外線吸収層上に、この感熱記録層塗布液を銀換算値として1.1g/m2となるようにワイヤーバーを用いて塗布し、80℃にて3分間乾燥させて感熱記録層を形成した。
トルエン25.7gに、アクリディック(登録商標)WFU-289(DIC(株)製;アクリルポリオール樹脂)11.4g、シーホスター(登録商標)KE-P250(日本触媒(株)製;シリカ粒子、平均粒子径2.5μm)0.30gを加え、撹拌して全体を均一にした後、撹拌しながらコロネートHL(東ソー(株)製;ポリイソシアネート)14gを加えて保護層塗布液を得た。この保護層塗布液を上記感熱記録層上に乾燥質量が1.5g/m2となるようにワイヤーバーを用いて塗布し、80℃にて3分間乾燥させたのち40℃にて5日間加温して保護層を形成した。このようにして実施例31の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の添加量を1.2gとして感熱記録層塗布液を得た以外は実施例31と同様にして実施例32の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにイソフタル酸を0.57g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例33の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりに4-ヒドロキシイソフタル酸を0.63g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例34の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりに5-メトキシイソフタル酸を0.68g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例35の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりに2-メチルテレフタル酸を0.62g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例36の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにコハク酸を0.41g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例37の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにアジピン酸を0.50g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例38の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにスベリン酸を0.60g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例39の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸0.40gに加えて、更にイソフタル酸を0.57g加えて感熱記録層塗布液を得た以外は実施例31と同様にして実施例40の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸を加えずに感熱記録層塗布液を得た以外は実施例31と同様にして比較例16の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにマレイン酸を0.40g加えて感熱記録層塗布液を得た以外は実施例31と同様にして比較例17の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにフタル酸を0.57g加えて感熱記録層塗布液を得た以外は実施例31と同様にして比較例18の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにマロン酸を0.36g加えて感熱記録層塗布液を得た以外は実施例31と同様にして比較例19の感熱記録材料を得た。
実施例31の感熱記録層塗布液の調製及び塗布において、フマル酸の代わりにセバシン酸を0.70g加えて感熱記録層塗布液を得た以外は実施例31と同様にして比較例20の感熱記録材料を得た。
このようにして得られた実施例31~40および比較例16~20の感熱記録材料を、サーマルCTPセッター(Guangzhou Amsky Technology Co Ltd製、AURA600E)を用いて赤外線レーザー光で露光し、塗りつぶし画像(20mm(幅)×200mm(長さ))を得た。サーマルCTPセッターのドラム回転数は300rpmに固定し、レーザー出力を200mW、240mW、300mW、400mWに変化させて、それぞれの出力で感熱記録材料1つにつき4つの塗りつぶし画像を得た。
上記画像形成後の実施例31~40および比較例16~20の感熱記録材料における非画像部、及びレーザー出力を変化させて作製した4つの画像部それぞれの紫外光透過濃度および可視光透過濃度を、エックスライト社製X-Rite(登録商標)361Tの紫外光モードおよび可視光モードでそれぞれ測定し、それぞれの感熱記録材料における、塗りつぶし画像の紫外光透過濃度(Dmax)と非画像部の紫外光透過濃度(Dmin)との差「Dmax-Dmin」の値、およびレーザー出力200mW、240mW、300mW、400mWにおける紫外光透過濃度および可視光透過濃度を表4と表5に示した。
また、比較例17の感熱記録材料は、感熱記録層塗布液に前記した一般式(1)~(4)で示される化合物の群から選ばれる化合物に代えてマレイン酸を加えたので、非画像部の可視光透過濃度が高く、画像部の可視光透過濃度が赤外線レーザー光の照射量増加に伴って(特に、300mW以下の出力において)ほとんど増加しない。
また、比較例18および比較例19の感熱記録材料は、感熱記録層塗布液に前記した一般式(1)~(4)で示される化合物の群から選ばれる化合物に代えてフタル酸およびマロン酸をそれぞれ加えたので、非画像部の可視光透過濃度が高い。
そして、比較例20の感熱記録材料は、感熱記録層塗布液に前記した一般式(1)~(4)で示される化合物の群から選ばれる化合物に代えてセバシン酸を加えたので、画像部の可視光透過濃度が赤外線レーザー光の照射量増加に伴って(特に、300mW以下の出力において)ほとんど増加しない。
Claims (5)
- 光透過性支持体上に、830nmにおけるモル吸光係数ε(830)と、365nmにおけるモル吸光係数ε(365)の比ε(830)/ε(365)が4.0以上の赤外線吸収色素を含有する赤外線吸収層、非感光性の有機銀塩を含有し、且つ、感光性のハロゲン化銀を実質的に含有しない感熱記録層、および保護層とを少なくともこの順に有する感熱記録材料。
- 赤外線吸収層が更に還元剤を含有する、請求項1に記載の感熱記録材料。
- 保護層が親水性粒子と疎水性樹脂を含有し該保護層の厚みが2.3~9.4μmである、請求項1に記載の感熱記録材料。
- 感熱記録層が更に還元剤を含有する、請求項1に記載の感熱記録材料。
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JP2001010238A (ja) * | 1999-06-04 | 2001-01-16 | Agfa Gevaert Nv | 向上した画像色調を有するサーモグラフィ記録材料 |
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US7312176B2 (en) * | 2002-10-24 | 2007-12-25 | Nippon Paper Industries Co., Ltd. | Thermally sensitive recording medium |
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JPH09504239A (ja) * | 1993-09-14 | 1997-04-28 | アグファ−ゲヴェルト ナームロゼ ベンノートチャップ | ヒートモード像を形成するための方法及び材料 |
JPH07323667A (ja) * | 1994-05-30 | 1995-12-12 | Agfa Gevaert Nv | 直接熱記録に使用するのに好適な感熱性材料 |
JPH11198532A (ja) * | 1998-01-07 | 1999-07-27 | Konica Corp | 画像形成方法及び画像記録体 |
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JP2001010229A (ja) * | 1999-07-01 | 2001-01-16 | Konica Corp | 熱発色画像形成材料および熱発色画像形成方法 |
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