WO2015053164A1 - 光カチオン硬化性インクジェットインク、光カチオン硬化性インクジェットインクの製造方法、印刷物、および印刷物の製造方法 - Google Patents
光カチオン硬化性インクジェットインク、光カチオン硬化性インクジェットインクの製造方法、印刷物、および印刷物の製造方法 Download PDFInfo
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- WO2015053164A1 WO2015053164A1 PCT/JP2014/076415 JP2014076415W WO2015053164A1 WO 2015053164 A1 WO2015053164 A1 WO 2015053164A1 JP 2014076415 W JP2014076415 W JP 2014076415W WO 2015053164 A1 WO2015053164 A1 WO 2015053164A1
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- curable inkjet
- inkjet ink
- epoxy compound
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
Definitions
- the present invention relates to an ink for a photocation curable ink jet printer and a printed matter thereof.
- the inkjet recording method Since the inkjet recording method is simple and can produce images at low cost, it has been applied to various printing fields such as photographs, various printing, marking, and special printing such as color filters. Recently, application has been advanced to printing on materials such as glass, resin, and metal. As described above, as the printing object is expanded to other than paper, the aqueous ink jet method, the phase change ink jet method using a solid wax ink at room temperature, and the solvent using an ink mainly composed of a fast-drying organic solvent. Inkjet ink jet systems and UV ink jet ink systems that crosslink with ultraviolet (UV) light after recording have been developed.
- UV ultraviolet
- the UV inkjet method has a relatively low odor compared to the solvent-based inkjet method, and can be recorded on a recording medium having no quick-drying property and no ink absorption.
- radical curing systems using () acrylate materials are the mainstream, but cationic curing materials using materials such as epoxy, vinyl ether, oxetane, etc.
- (a) inhibits curing by oxygen. It is difficult to receive, and the thin film can be cured even in the air.
- B) The shrinkage at the time of curing is small and the adhesiveness is excellent.
- (C) The curing proceeds by the dark reaction even after curing by light irradiation.
- paints, adhesives, display sealants, printing inks, three-dimensional modeling, silicone release paper, photoresists, electronic components Application is progressing to sealing agents for automobiles.
- Patent Document 1 discloses an actinic ray curable ink containing a compound having an oxirane group and a compound having an oxetane ring as a photoacid generator and a photocationically polymerizable compound from an inkjet recording head.
- the actinic ray curable ink is landed and then cured by light of 210 to 280 nm Is disclosed and can be applied to non-absorbable recording materials.
- Patent Document 2 discloses a composition containing an epoxy group-containing silane coupling agent having both photocationic curability and silane coupling property, and a photocationic polymerization initiator, such as glass and resin. It is said that a photocationic curable composition excellent in adhesion to a substrate and having a cured product excellent in transparency, a coating material comprising the composition, and an ink for an ink jet printer can be provided.
- Patent Document 1 it is possible to record on a non-absorbing recording material, and in Patent Document 2, it is recorded on glass.
- the painted surface is made of a curable resin. Since it is often cured, there is a problem that the adhesion is insufficient and the film is easily peeled off.
- inorganic pigments are often used as a coloring material for decoration in consideration of weather resistance.
- UV curability is insufficient because they block ultraviolet rays.
- dispersibility of the ink-jet ink is often insufficient.
- an object of the present invention is to provide a photocationic curable inkjet ink that adheres well to a painted surface using a curable resin and is excellent in dispersion stability and ultraviolet curable properties even when an inorganic pigment is used.
- the present invention (1) A photocation containing a photoacid generator, a pigment, a monofunctional epoxy compound (excluding organosiloxane having an epoxy group), a bifunctional epoxy compound, a monofunctional oxetane compound and a bifunctional oxetane compound Curable inkjet ink, (2)
- the content concentration of the monofunctional epoxy compound is 20 to 50% by weight
- the content concentration of the bifunctional epoxy compound is 20 to 50% by weight
- the content concentration of the monofunctional oxetane compound is 5 to 20% by weight
- the concentration of the bifunctional oxetane compound is 5 to 20% by weight
- the photocationically curable inkjet ink according to (1) which is (3)
- a method for producing a printed material comprising a step of irradiating the photocationic curable inkjet ink deposited thereon with an energy ray and curing the ink, (13)
- Printed matter obtained by the method for producing printed matter according to (12) (14)
- the printed matter according to (13), wherein a maximum ink thickness of the cured photocationic curable inkjet ink on the substrate is 10 ⁇ m or more and 30 ⁇ m or less, It is.
- the photocationic curable inkjet ink of the present invention is excellent in photocurability and dispersion stability even when an inorganic pigment is used, and the printed matter is also excellent in adhesion to a painted surface using a curable resin. ing.
- the photocationic curable inkjet ink of the present invention includes a photoacid generator (F), a pigment (E), a monofunctional epoxy compound (A) (excluding organosiloxane having an epoxy group), a bifunctional epoxy compound (B), A monofunctional oxetane compound (C) and a bifunctional oxetane compound (D) are contained.
- the photocationic curable inkjet ink according to the present embodiment is not particularly limited, but is particularly applicable to a painted surface, for example, a photocationic curable inkjet ink.
- the monofunctional epoxy compound (A), the bifunctional epoxy compound (B), the monofunctional oxetane compound (C), and the bifunctional oxetane compound (D) are used as a photocationically polymerizable compound. Used.
- the photocationic curable inkjet ink of the present invention contains at least one monofunctional epoxy compound (A) as a photocationically polymerizable compound.
- monofunctional epoxy compound (A) used in the present invention include aromatic monoepoxides, alicyclic monoepoxides, and aliphatic monoepoxides, and alicyclic compounds are particularly considered in view of adhesion and curability to the painted surface.
- Monoepoxide is preferably used.
- the monofunctional epoxy compound (A) is not an organosiloxane having an epoxy group.
- the cycloaliphatic monoepoxide contains cyclohexene oxide or cyclopentene oxide obtained by epoxidizing a compound having a cycloalkane ring such as cyclohexene or cyclopentene ring with an appropriate oxidizing agent such as hydrogen peroxide or peracid.
- a compound is preferred, a cyclohexene oxide is preferred because it is easily available as a commercial product.
- cyclohexene oxide having a carboxylic acid ester such as 3,4-epoxycyclohexanecarboxylic acid methyl ester, 1,2-epoxy And cyclohexene oxide having an alkylene group or an alkyl group such as -4-vinylcyclohexane.
- the alicyclic monoepoxide preferably contains a monocarboxylic acid ester of an alicyclic monoepoxide.
- the monocarboxylic acid ester of the alicyclic monoepoxide is more preferably represented by the following formula (1), and more preferably, for example, 3,4-epoxycyclohexanecarboxylic acid methyl ester.
- R is an alkyl group having 1 to 20 carbon atoms
- the higher alcohol of the higher alcohol diester of epoxyhexahydrophthalic acid is preferably one having 8 or more carbon atoms, and examples include octyl alcohol, 2-ethylhexyl alcohol, dodecyl alcohol, cetyl alcohol, Octyl alcohol or 2-ethylhexyl alcohol is particularly preferred because it is easily available.
- the higher alcohol in the present invention includes epoxidized higher linear alcohol.
- Sunsizer E-PO chemical name: epoxyhexahydrophthalic acid diepoxy stearyl manufactured by Shin-Nihon Rikagaku Co., Ltd. may be mentioned.
- the higher alcohol diester of epoxyhexahydrophthalic acid is preferably represented by the following formula (2).
- R ′ is an alkyl group having 6 to 20 carbon atoms
- the alicyclic monoepoxide preferably contains both a monocarboxylic acid ester of alicyclic monoepoxide and a higher alcohol diester of epoxyhexahydrophthalic acid. If it does so, the photocationic curable inkjet ink excellent in balance with sclerosis
- the photocationic curable inkjet ink of the present invention further contains at least one bifunctional epoxy compound (B) as a photocationically polymerizable compound.
- bifunctional epoxy compounds (B) include aromatic diepoxides, alicyclic diepoxides (that is, alicyclic bifunctional epoxy compounds), and aliphatic diepoxides.
- a diepoxide in which at least one epoxy is alicyclic is then preferably used. Specific examples include 1,2-epoxy-4- (2-methyloxiranyl) -1-methylcyclohexane, 3 ′, 4′-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, and the like.
- the photocation curable inkjet ink of this invention contains 1 or more types of a monofunctional oxetane compound (C) as a photocation polymerizable compound.
- the monofunctional oxetane compound (C) is not particularly limited, and examples thereof include 2-ethylhexyl oxetane. Specifically, Aron oxetane OXT-101, OXT-212, OXT-211, OXT manufactured by Toagosei Co., Ltd. -213 and the like.
- the photocation curable inkjet ink of this invention contains 1 or more types of a bifunctional oxetane compound (D) as a photocation polymerizable compound.
- a bifunctional oxetane compound (D) examples include 3-ethyl-3 ⁇ [((3-ethyloxetane-3-yl) methoxy] methyl ⁇ oxetane and the like, and specific examples include Aron oxetane manufactured by Toagosei Co., Ltd. There are OXT-121, OXT-221, etc., but not limited thereto.
- the concentration of each of the photocationically polymerizable compounds described in detail above is determined in consideration of the balance of ink dispersion solubility, ejection stability, curability, adhesion to the painted surface, and the like.
- the content of the bifunctional epoxy compound (B) is preferably 20 to 50% by weight, more preferably 30 to 40% because the curability is lowered when the content is less than 20% by weight, and the adhesiveness is lowered when the content exceeds 50% by weight. % By weight.
- the content concentration of the monofunctional oxetane compound (C) is less than 5% by weight, the dispersion stability of the ink is lowered, and when it exceeds 20% by weight, the solubility of other components in the ink is lowered and the generation of precipitates, etc. Therefore, the content is preferably 5 to 20% by weight, more preferably 5 to 10% by weight.
- the content concentration of the bifunctional oxetane compound (D) is less than 5% by weight, the dispersion stability of the ink is lowered, and when it exceeds 20% by weight, the adhesiveness is lowered. 5 to 15% by weight.
- the photocationically curable inkjet ink of the present invention contains a pigment (E).
- a pigment As the pigment (E), various organic pigments and / or inorganic pigments can be used. Specifically, white pigments such as titanium oxide, zinc white, lead white, lithobon and antimony oxide, black pigments such as aniline black, iron black, and carbon black, yellow lead, yellow iron oxide, Hansa Yellow (100, 50 30), yellow pigments such as titanium yellow, benzine yellow, and permanent yellow, orange pigments such as chrome vermilon, permanent orange, balkan first orange, and indanthrene brilliant orange, iron oxide, permanent brown, and para Brown pigments such as brown, red pigments such as bengara, cadmium red, antimony vermilion, permanent red, rhodamine lake, alizarin lake, thioindigo red, PV carmine, monolite face tread, quinacridone red pigment, co Purple pigments such as baltic purple, manganese purple, first bilet, methyl
- the pigment (E) is preferably an inorganic pigment from the viewpoint of weather resistance.
- inorganic pigments include, for example, white pigments such as titanium oxide, zinc white, lead white, lithobon, and antimony oxide, black pigments such as iron black, yellow pigments such as yellow lead, yellow iron oxide, and titanium yellow, and chrome vermilo.
- Orange pigments such as ON, brown pigments such as iron oxide, red pigments such as Bengala, cadmium red, antimony vermilion, and monolite face treads, purple pigments such as cobalt purple and manganese purple, blues such as ultramarine and cobalt blue
- green pigments such as chrome green, chromium oxide, emerald green, and green gold
- various fluorescent pigments metal powder pigments, extender pigments, and the like.
- pigment (E) examples include Sicotrans Yellow L1916 (manufactured by BASF Japan), DAIPYROXIDE RED8270 (manufactured by Dainichi Seika Kogyo Co., Ltd.), and transparent cobalt blue CR-4 (Asahi Kasei Kogyo Co., Ltd.). ), Lionol Blue FG-7400 (manufactured by Toyocolor Co., Ltd.), Mitsubishi Carbon Black MA7 (manufactured by Mitsubishi Chemical Corporation), and the like.
- the photocation curable inkjet ink of the present invention uses an inorganic pigment as the pigment (E) as described above. Compared with, the effect of blocking ultraviolet rays is high, and therefore, curing is likely to occur.
- it is curable by using a monofunctional epoxy compound (A), a bifunctional epoxy compound (B), a monofunctional oxetane compound (C), and a bifunctional oxetane compound (D) as a photocationic polymerizable compound.
- A monofunctional epoxy compound
- B bifunctional epoxy compound
- C monofunctional oxetane compound
- D bifunctional oxetane compound
- the photoacid generator (F) used in the present invention is a compound capable of generating a substance that initiates cationic polymerization by ultraviolet irradiation, and particularly preferred is an onium salt that generates a Lewis acid by light irradiation. is there. Specific examples include a diazonium salt of a Lewis acid, an iodonium salt of a Lewis acid, a sulfonium salt of a Lewis acid, and the like.
- the cation portion is aromatic diazonium, aromatic iodonium, aromatic sulfonium, respectively, and the anion portion is BF4-, PF6-, SbF6-, [BX4]-(wherein X is a phenyl group substituted with at least two fluorine or trifluoromethyl groups) and the like.
- phenyldiazonium salt of boron tetrafluoride diphenyliodonium salt of phosphorus hexafluoride, diphenyliodonium salt of antimony hexafluoride, tri-4-methylphenylsulfonium salt of arsenic hexafluoride, antimony tetrafluoride Tri-4-methylphenylsulfonium salt, tetrakis (pentafluorophenyl) boron diphenyliodonium salt, acetylacetone aluminum salt and orthonitrobenzylsilyl ether mixture, phenylthiopyridinium salt, phosphorus hexafluoride allene-iron complex, etc. be able to.
- CD-1012 manufactured by SARTOMER
- PCI-019 manufactured by Nippon Kayaku Co., Ltd.
- PCI-021 manufactured by Nippon Kayaku Co., Ltd.
- Optmer SP-150 manufactured by Asahi Denka Co., Ltd.
- UVI -6990 manufactured by Dow Chemical Co., Ltd.
- CPI-100P manufactured by Sakai San Apro Co., Ltd.
- TEPBI-S manufactured by Nippon Shokubai Co., Ltd.
- the concentration of the photoacid generator (F) is 0.1 to 15% by weight. If it is less than 0.1% by weight, the curability and the adhesion to the substrate are insufficient, and if it exceeds 15% by weight, the physical properties of the ink film such as film strength are lowered.
- the photocationic curable inkjet ink of the present invention further includes radically polymerizable compounds such as (meth) acrylate monomers and oligomers and vinyl (meth) acrylate, photoradical initiators, antifoaming agents, and leveling agents as necessary.
- radically polymerizable compounds such as (meth) acrylate monomers and oligomers and vinyl (meth) acrylate, photoradical initiators, antifoaming agents, and leveling agents as necessary.
- Polymerization inhibitors, waxes, antioxidants, non-reactive polymers, fine particle inorganic fillers, silane coupling agents, light stabilizers, ultraviolet absorbers, antistatic agents, slip agents, solvents, and the like can be added.
- silane coupling agent for example, an organosiloxane having an epoxy group can be used.
- an organosiloxane having an epoxy group can be used.
- KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd. can be used.
- a method for producing the photocationically curable inkjet ink according to this embodiment will be described below.
- the production method at least a part of the pigment (E) and at least a part of the other components are mixed to obtain a pigment dispersion, and a post-addition step of adding the remaining components to the pigment dispersion. including.
- a photocation curable inkjet ink can be produced stably.
- An example of the manufacturing method will be described in detail below.
- the photocationic curable inkjet ink of the present invention produces a pigment dispersion by mixing and dispersing the pigment (E) with a dispersant in one or more selected from the solvent and the photocationically polymerizable compound (mixed dispersion). Step), the remaining photocationically polymerizable compound, photoacid generator (F), and, if necessary, radically polymerizable compound and photoradical initiator, antifoaming agent, leveling agent, polymerization inhibitor, waxes
- an antioxidant, a non-reactive polymer, a fine particle inorganic filler, a silane coupling agent, a light stabilizer, an ultraviolet absorber, an antistatic agent, a slip agent and the like are added (post-addition process).
- pigment dispersant examples include higher fatty acid salts, alkyl sulfates, alkyl ester sulfates, alkyl sulfonates, sulfosuccinates, naphthalene sulfonates, alkyl phosphates, and polyoxyalkylene alkyls.
- Activators such as ether phosphates, polyoxyalkylene alkylphenyl ethers, glycerin esters, sorbitan esters, polyoxyethylene fatty acid amides, or styrene, styrene derivatives, vinyl naphthalene derivatives, acrylic acid, acrylic acid derivatives, maleic acid, maleic acid Examples thereof include block copolymers composed of two or more monomers selected from derivatives, itaconic acid, itaconic acid derivatives, fumaric acid and fumaric acid derivatives, random copolymers, and salts thereof. Or Polymeric pigment dispersant having a Min number and the acid number and the like. With respect to the photocationic curable inkjet ink, the concentration of the dispersant may be 0.1 to 15% by weight.
- Ajisper PB824, Ajisper PB881 manufactured by Ajinomoto Fine Techno Co., Ltd.
- Ajisper PB881 manufactured by Ajinomoto Fine Techno Co., Ltd.
- the dispersant can be used as the dispersant.
- Examples of the dispersion method (mixing and dispersing step) of the pigment (E) include various types such as a ball mill, a bead mill, a sand mill, an attritor, a roll mill, an agitator, a Henschel mixer, a colloid mill, an ultrasonic homogenizer, a pearl mill, a wet jet mill, and a paint shaker.
- a disperser can be used.
- a centrifuge or a filter may be used for the purpose of removing coarse particles of the pigment dispersion.
- the remaining material is added to the obtained pigment dispersion and mixed and stirred, for example, with a homomixer. Then, if necessary, it can filter using a glass filter etc., and can obtain a photocation curable inkjet ink.
- the post-addition step is performed in a dry air atmosphere under light shielding. For example, a glass filter having a pore size of 0.5 ⁇ m or more and 5 ⁇ m or less can be used.
- the bifunctional epoxy compound (B) is preferably added only in the post-addition step. By doing so, it is possible to prevent thickening and the like, and to produce a photocation curable inkjet ink more stably.
- the viscosity of the photocation curable inkjet ink of the present invention is preferably 3 to 60 mPa ⁇ sec at 25 ° C. With this level of viscosity, it can be easily adjusted to the desired viscosity by adjusting the temperature of the ink.
- the photocation curable inkjet ink is preferably adjusted to have a viscosity increase rate of 9% or less when it is allowed to stand at 45 ° C. for 3 days by adjusting its content, content balance, production method, and the like. More preferably, it is as follows. Further, the viscosity increase rate is preferably 0% or more. By doing so, it can be set as the photocation curable inkjet ink which is more excellent in stability.
- the rate of increase in viscosity when allowed to stand at 45 ° C. for 3 days is specifically the initial viscosity at 25 ° C. as a, and the viscosity at 25 ° C. after standing at 45 ° C. for 3 days as b. Is a value obtained by (b ⁇ a) / a ⁇ 100 (%).
- the photocation curable inkjet ink is preferably adjusted to have a viscosity increase rate of 4% or less when left at 5 ° C. for 3 days by adjusting its content, content balance, production method, and the like. More preferably, it is as follows.
- the viscosity increase rate is preferably ⁇ 2% or more, and more preferably ⁇ 1% or more. By doing so, it can be set as the photocation curable inkjet ink which is more excellent in stability.
- the rate of increase in viscosity when allowed to stand at 5 ° C. for 3 days is specifically the initial viscosity at 25 ° C. a and the viscosity at 25 ° C. after standing at 5 ° C. for 3 days as c. Is a value obtained by (c ⁇ a) / a ⁇ 100 (%).
- the manufacturing method of the printed matter includes a step of attaching the photocationic curable inkjet ink according to the present embodiment to a substrate, and a step of irradiating the attached photocationic curable inkjet ink with an energy ray and curing the ink.
- a base material is not specifically limited, For example, a curable resin may be coated and hardened on a steel plate, an iron plate, etc.
- the energy ray is, for example, light including ultraviolet rays having a wavelength of 210 to 280 nm. This will be described in detail below.
- the photo cation curable inkjet ink is adhered to a coated steel plate or the like using an inkjet printer equipped with a piezo inkjet head.
- the ink droplets ejected by the ink jet printer can be, for example, 3 pL or more and 100 pL or less.
- the ink is cured by irradiating the active energy ray with a high-pressure mercury lamp or the like to obtain a printed matter.
- integrated quantity of light in a wavelength band of 260 nm ⁇ 400 nm is irradiated with an energy beam so as to be 300 mJ / cm 2 or more 750 mJ / cm 2 or less. Irradiation may be performed multiple times or may be cured at a time.
- the maximum ink thickness in the printed materials is generally about 8 ⁇ m. In order to obtain an excellent printed material, the maximum ink thickness is preferably 10 ⁇ m or more. On the other hand, from the viewpoint of easy curing of the ink, the maximum ink thickness of the printed material is preferably 30 ⁇ m or less.
- the monofunctional epoxy compound (A) when a higher alcohol diester of epoxyhexahydrophthalic acid, which is a kind of alicyclic monoepoxide, is used as the monofunctional epoxy compound (A), the influence of the background is reduced and the color gamut that can be expressed is expanded.
- the thickness of the ink before drying may be different from the thickness of the ink that has been dried and cured (solidified).
- the ink thickness refers to the thickness of the cured ink in the printed matter. Refers to the film thickness.
- the photocationic curable inkjet ink of the present invention is printed on a painted surface using an inkjet recording apparatus, for example.
- the coated surface is obtained by, for example, coating and curing a curable resin on a steel plate, an iron plate or the like as a base material.
- the photocation curable inkjet ink of the present invention is particularly a melamine-based thermosetting resin. Excellent adhesion to the painted surface. Therefore, the surface of the base material is a painted surface of a melamine-based thermosetting resin, and it is more effective when printing on the surface.
- the photocationically curable inkjet ink according to the present embodiment has excellent dispersion stability, and also has the effect of being excellent in adhesion and curability in printed matter.
- Tables 1 and 2 list the composition of the examples, and Table 3 lists the composition of the comparative example.
- Table 4 summarizes the compound names of the materials used in Tables 1 to 3.
- the unit of composition of each example is “% by weight”.
- the whole inkjet ink for photocation curable coating surfaces was made into 100 weight%.
- Example 1 The materials of the pigment dispersion liquid of Example 1 in Table 1 were premixed and then processed for 4 hours in a sand mill to obtain a pigment dispersion liquid (mixing dispersion process). To the obtained pigment dispersion, the remaining material was added in a dry air atmosphere under light shielding, and mixed and stirred for 30 minutes with a homomixer (post-addition step), and then subjected to pressure filtration using a glass filter with a pore size of 2 ⁇ m. Then, an ink-jet ink for photocationic curable coating of Example 1 was obtained.
- Examples 2 to 16, Comparative Examples 1 to 6 According to the compositions of Examples 2 to 9 in Table 1, the same treatment as in Example 1 was performed to obtain the photocation curable inkjet inks for coated surfaces of Examples 2 to 9. Further, according to the compositions of Examples 10 to 16 in Table 2, the same treatment as in Example 1 was carried out to obtain the photocation curable inkjet inks for coated surfaces of Examples 10 to 16. Further, according to the compositions of Comparative Examples 1 to 6 in Table 3, the same treatment as in Example 1 was performed to obtain inkjet inks of Comparative Examples 1 to 6.
- Examples and Comparative Examples were evaluated according to the following four items: storage stability (dispersion stability), photocuring pass number (curability), adhesion, and flexibility.
- ⁇ Storage stability> The inks of Examples and Comparative Examples were stored in ovens at 5 ° C. and 45 ° C. for 3 days, and the change in viscosity was less than ⁇ 10% from the initial viscosity.
- the change in viscosity is based on viscosity measurement using a cone plate viscometer TV-22 (manufactured by Toki Sangyo Co., Ltd.) at 25 ° C.
- a coated steel sheet obtained by coating a melamine resin with a resolution of 360 ⁇ 360 dpi using an ink jet printer equipped with a piezo type ink jet head (KM512LH, manufactured by Konica Minolta Co., Ltd.) and thermally curing the inks of Examples and Comparative Examples.
- the curability was evaluated in the same manner as described above except that the printing resolution was 720 ⁇ 360 dpi.
- the printing resolution was 720 ⁇ 360 dpi.
- the thickness of the printed ink was confirmed to be 15.6 ⁇ m both before and after curing.
- the adhesion was evaluated in the same manner as described above except that the printing resolution was 720 ⁇ 360 dpi.
- the evaluation results of the examples are shown in Table 5 and the evaluation results of the comparative examples are shown in Table 6.
- the ink-jet inks of Examples 1 to 16 are not limited to any type of pigment. It can also be seen that they are excellent in storage stability, curability and adhesion. On the other hand, none of the comparative examples had excellent storage stability, curability and adhesion. In Comparative Example 6, since the dispersant did not dissolve, the subsequent evaluation was not performed.
- the ink jet inks of Examples 10 to 15 contain a higher alcohol diester of epoxyhexahydrophthalic acid, which is an alicyclic monoepoxide, as a monofunctional epoxy compound, in addition to storage stability, curability and adhesion. It can be seen that it is also flexible.
- Example 16 contains epoxyepoxyhydrohydrodiepoxystearyl, which is a triepoxide as an alicyclic monoepoxide, and is excellent in flexibility in addition to storage stability, curability and adhesion. I understand.
- Photocationic curability characterized by containing a monofunctional epoxy compound, a bifunctional epoxy compound, a monofunctional oxetane compound and a bifunctional oxetane compound as a photoacid generator, pigment, and photocationically polymerizable compound Inkjet ink for painted surfaces.
- the content concentration of the monofunctional epoxy compound is 20 to 50% by weight
- the content concentration of the bifunctional epoxy compound is 20 to 50% by weight
- the content concentration of the monofunctional oxetane compound is 5 to 20% by weight
- the concentration of the bifunctional oxetane compound is 5 to 20% by weight
- the inkjet ink for photocationic curable coating surfaces according to (1) characterized in that: (3)
- the monofunctional epoxy compound is an alicyclic monofunctional epoxy compound, (1) or (2), the cationic ink-curable inkjet ink for a coated surface.
- the photo-cationic curable inkjet ink according to any one of (1) to (5) is printed by an inkjet method and cured with light containing ultraviolet rays having a wavelength of 210 to 280 nm. Printed matter.
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Abstract
Description
(1) 光酸発生剤、顔料、単官能エポキシ化合物(エポキシ基を有するオルガノシロキサンを除く。)、二官能エポキシ化合物、単官能オキセタン化合物および二官能オキセタン化合物を含有することを特徴とする光カチオン硬化性インクジェットインク、
(2) 前記光カチオン硬化性用インクジェットインク中の、
前記単官能エポキシ化合物の含有濃度が20~50重量%、
前記二官能エポキシ化合物の含有濃度が20~50重量%、
前記単官能オキセタン化合物の含有濃度が5~20重量%、
および前記二官能オキセタン化合物の含有濃度が5~20重量%、
であることを特徴とする(1)記載の光カチオン硬化性インクジェットインク、
(3) 前記単官能エポキシ化合物が脂環式モノエポキシドを含むことを特徴とする(1)または(2)記載の光カチオン硬化性インクジェットインク、
(4) 前記脂環式モノエポキシドが脂環式モノエポキシドのモノカルボン酸エステルを含むことを特徴とする(3)に記載の光カチオン硬化性インクジェットインク、
(5) 前記脂環式モノエポキシドがエポキシヘキサヒドロフタル酸の高級アルコールジエステルを含むことを特徴とする(3)に記載の光カチオン硬化性インクジェットインク、
(6) 前記脂環式モノエポキシドが脂環式モノエポキシドのモノカルボン酸エステルおよびエポキシヘキサヒドロフタル酸の高級アルコールジエステルを含むことを特徴とする(3)に記載の光カチオン硬化性インクジェットインク、
(7) 前記二官能エポキシ化合物が脂環式二官能エポキシ化合物を含むことを特徴とする(1)から(6)のいずれか一つに記載の光カチオン硬化性インクジェットインク、
(8) 前記顔料が、無機顔料を含むことを特徴とする(1)から(7)のいずれか一つに記載の光カチオン硬化性インクジェットインク、
(9) 45℃で3日間静置した場合の粘度増加率が0%以上9%以下であることを特徴とする(1)から(8)のいずれか一つに記載の光カチオン硬化性インクジェットインク、
(10) 前記顔料の少なくとも一部と、その他の成分の少なくとも一部を混合して顔料分散液を得る混合分散工程と、
前記顔料分散液に残りの成分を添加する後添加工程とを含む、(1)から(9)のいずれか一つに記載の光カチオン硬化性インクジェットインクの製造方法、
(11) 前記二官能エポキシ化合物を前記後添加工程でのみ添加する、(10)に記載の光カチオン硬化性インクジェットインクの製造方法、
(12) (1)から(9)のいずれか一つに記載の光カチオン硬化性インクジェットインクを、基材に付着させる工程と、
付着させた前記光カチオン硬化性インクジェットインクにエネルギー線を照射して硬化させる工程とを含む印刷物の製造方法、
(13) (12)に記載の印刷物の製造方法により得られた印刷物、
(14) 前記基材上の、硬化した前記光カチオン硬化性インクジェットインクの最大インク厚みが10μm以上30μm以下である(13)に記載の印刷物、
である。
本発明の光カチオン硬化性インクジェットインクは、光カチオン重合性化合物として、単官能エポキシ化合物(A)の1種以上を含有する。本発明で用いる単官能エポキシ化合物(A)として、芳香族モノエポキシド、脂環式モノエポキシドおよび脂肪族モノエポキシド等が挙げられるが、特に塗装面への密着性および硬化性を考慮すると脂環式モノエポキシドが好ましく用いられる。
なお、直鎖状アルキレンのエポキシドは反応性に乏しく事実上反応に関与しないため、本発明において前記高級アルコールには、エポキシ化された高級直鎖状アルコールも含まれる。具体的には、新日本理化学社製のサンソサイザーE-PO(化学名:エポキシヘキサヒドロフタル酸ジエポキシステアリル)等が挙げられる。
本発明の光カチオン硬化性インクジェットインクは、光カチオン重合性化合物として、さらに二官能エポキシ化合物(B)の1種以上を含有する。これらの二官能エポキシ化合物(B)として、芳香族ジエポキシド、脂環式ジエポキシド(すなわち脂環式二官能エポキシ化合物)および脂肪族ジエポキシド等が挙げられるが、塗装面への密着性および硬化性を考慮すると少なくとも1個のエポキシが脂環式であるジエポキシドが好ましく用いられる。具体的には、1,2-エポキシ-4-(2-メチルオキシラニル)-1-メチルシクロヘキサン、3',4'-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート等が挙げられる。
また、本発明の光カチオン硬化性インクジェットインクは、光カチオン重合性化合物として、単官能オキセタン化合物(C)の1種以上を含有する。単官能オキセタン化合物(C)としては、特に限定されないが、たとえば、2-エチルヘキシルオキセタン等が挙げられ、具体的には東亞合成社製のアロンオキセタンOXT-101、OXT-212、OXT-211、OXT-213等が挙げられる。
また、本発明の光カチオン硬化性インクジェットインクは、光カチオン重合性化合物として、二官能オキセタン化合物(D)の1種以上を含有する。二官能オキセタン化合物(D)としてはたとえば、3-エチル-3{[(3-エチルオキセタン-3-イル)メトキシ]メチル}オキセタン等が挙げられ、具体例としては、東亞合成社製のアロンオキセタンOXT-121、OXT-221等があるがこの限りでない。
本発明の光カチオン硬化性インクジェットインクは顔料(E)を含有する。顔料(E)としては、有機顔料および/ または無機顔料の種々のものが使用可能である。具体的には、酸化チタン、亜鉛華、鉛白、リトボンおよび酸化アンチモン等の白色顔料、アニリンブラック、鉄黒、およびカーボンブラック等の黒色顔料、黄鉛、黄色酸化鉄、ハンザイエロー(100 、50 、30等)、チタンイエロー、ベンジンイエロー、およびパーマネントイエロー等の黄色顔料、クロームバーミロオン、パーマネントオレンジ、バルカンファーストオレンジ、およびインダンスレンブリリアントオレンジ等の橙色顔料、酸化鉄、パーマネントブラウン、およびパラブラウン等の褐色顔料、ベンガラ、カドミウムレッド、アンチモン朱、パーマネントレッド、ローダミンレーキ、アリザリンレーキ、チオインジゴレッド、P V カーミン、モノライトフェーストレッド、およびキナクリドン系赤色顔料等の赤色顔料、コバルト紫、マンガン紫、ファーストバイレット、メチルバイオレットレーキ、インダンスレンブリリアントバイオレット、ジオキサジンバイオレット等の紫色顔料、群青、紺青、コバルトブルー、アルカリブルーレーキ、無金属フタロシアニンブルー、銅フタロシアニンブルー、インダンスレンブルーおよびインジゴ等の青色顔料、クロムグリーン、酸化クロム、エメラルドグリーン、ナフトールグリーン、グリーンゴールド、アシッドグリーンレーキ、マラカイトグリーンレーキ、フタロシアニングリーン、およびポリクロルブロム銅フタロシアニン等の緑色顔料、その他各種蛍光顔料、金属紛顔料、体質顔料等が挙げられる。本発明の組成物中におけるこれらの顔料(E)の含有濃度は0.1 ~20重量% であり、好ましくは0.5~15重量% である。
無機顔料としてはたとえば、酸化チタン、亜鉛華、鉛白、リトボン、および酸化アンチモン等の白色顔料、鉄黒等の黒色顔料、黄鉛、黄色酸化鉄、およびチタンイエロー等の黄色顔料、クロームバーミロオン等の橙色顔料、酸化鉄等の褐色顔料、ベンガラ、カドミウムレッド、アンチモン朱、およびモノライトフェーストレッド等の赤色顔料、コバルト紫、およびマンガン紫等の紫色顔料、群青、およびコバルトブルー等の青色顔料、クロムグリーン、酸化クロム、エメラルドグリーン、およびグリーンゴールド等の緑色顔料、その他各種蛍光顔料、金属紛顔料、体質顔料等が挙げられる。
本発明で用いられる光酸発生剤(F)は、紫外線照射によりカチオン重合を開始させる物質を発生させることが可能な化合物であり、特に好ましいものとしては光照射によりルイス酸を発生させるオニウム塩である。具体的には、ルイス酸のジアゾニウム塩、ルイス酸のヨードニウム塩、ルイス酸のスルホニウム塩等が挙げられ、これらはカチオン部分がそれぞれ芳香族ジアゾニウム、芳香族ヨードニウム、芳香族スルホニウムであり、アニオン部分がBF4-、PF6-、SbF6-、[BX4]-( 但しここで、X は少なくとも2つ以上のフッ素又はトリフルオロメチル基で置換されたフェニル基) 等により構成されたオニウム塩である。具体例としては、四フッ化ホウ素のフェニルジアゾニウム塩、六フッ化リンのジフェニルヨードニウム塩、六フッ化アンチモンのジフェニルヨードニウム塩、六フッ化ヒ素のトリ- 4 - メチルフェニルスルホニウム塩、四フッ化アンチモンのトリ- 4 - メチルフェニルスルホニウム塩、テトラキス( ペンタフルオロフェニル) ホウ素のジフェニルヨードニウム塩、アセチルアセトンアルミニウム塩とオルトニトロベンジルシリルエーテル混合体、フェニルチオピリジウム塩、六フッ化リンアレン- 鉄錯体等を挙げることができる。
当該製造方法では、顔料(E)の少なくとも一部と、その他の成分の少なくとも一部を混合して顔料分散液を得る混合分散工程と、顔料分散液に残りの成分を添加する後添加工程とを含む。このように製造することにより、安定して光カチオン硬化性インクジェットインクを製造することができる。当該製造方法の例について以下に詳しく説明する。
当該印刷物の製造方法は、本実施形態に係る光カチオン硬化性インクジェットインクを、基材に付着させる工程と、付着させた光カチオン硬化性インクジェットインクにエネルギー線を照射して硬化させる工程とを含む。基材は特に限定されないが、たとえば鋼板、鉄板等に硬化性樹脂を塗装し硬化させたものでありうる。エネルギー線はたとえば、波長210~280nmの紫外線を含む光である。以下に詳細に説明する。
表1の実施例1の顔料分散液の材料をプレミックスした後、サンドミルにて4時間処理して顔料分散液を得た(混合分散工程)。得られた顔料分散液に、遮光下、乾燥空気雰囲気中で、残余の材料を加えてホモミキサーで30分間混合撹拌した(後添加工程)後、孔径2μmのガラスフィルターを用いて加圧濾過を行い、実施例1の光カチオン硬化性塗装用インクジェットインクを得た。
表1の実施例2~9の組成に従って、実施例1と同様に処理して実施例2~9の光カチオン硬化性塗装面用インクジェットインクを得た。また、表2の実施例10~16の組成に従って、実施例1と同様に処理して実施例10~16の光カチオン硬化性塗装面用インクジェットインクを得た。また、表3の比較例1~6の組成に従って、実施例1と同様に処理して比較例1~6のインクジェットインクを得た。
実施例および比較例のインクを5℃および45℃のオーブンに3日間保存し、粘度変化が初期粘度から±10%未満で、析出、沈降等がなければ合格○とした。なお、粘度変化は、25℃でのコーンプレート型粘度計TV-22(東機産業(株)製)を用いた粘度測定による。
実施例および比較例の調製直後のインクを45℃で3日間静置した後、25℃に戻して粘度を測定した。そして、25℃で測定した調製直後のインクの初期粘度を基準とする増加率を求めた。結果を表5および表6中に示した。なお、粘度の測定には、コーンプレート型粘度計TV-22(東機産業(株)製)を用いた。
また同様に、調製直後のインクを5℃で3日間静置した場合の粘度の増加率を求め、結果を表5および表6中に示した。
実施例および比較例のインクをピエゾ型インクジェットヘッド(KM512LH、コニカミノルタ社製)を搭載したインクジェットプリンタを用いて360x360dpiの解像度で、メラミン系樹脂を塗装し熱硬化させた塗装鋼板(IGアイボリー、JFE鋼板社製)にベタ刷りし、高圧水銀灯を用いて、1回あたり、波長260nm~400nmにおける積算光量150mJ/cm2の活性エネルギー線照射量を照射後、皮膜を指触観察し、表面が硬化し、ベタつきがなくなるまでに要した照射回数(パス数)を求めた。照射回数(パス数)が少ないほど光硬化性が良好といえる。照射回数が5回以下を○、5回を超えるものを×として評価した。また、解像度を360x360dpiとしてインクジェット印刷すると、その印刷したインクの厚みは硬化前、硬化後のいずれにおいても7.8μmとなることを確認した。
ピエゾ型インクジェットヘッド(KM512LH、コニカミノルタ社製)を搭載したインクジェットプリンタを用いて360x360dpiの解像度で、実施例および比較例のインクを塗装鋼板(IGアイボリー、JFE鋼板社製)の表面にベタ刷りし、そのベタ刷り物に前記光硬化パス数で求めたパス数の活性エネルギー線を照射して硬化させた後、各硬化膜に×状の切れ込みを入れ、その上にセロファンテープを密着させて剥がしたときに、その硬化皮膜が剥がれないものを○、剥がれるものを×として評価とした。
前記硬化性(光硬化パス数)の評価で得られた試験片を用いてJIS K-5600-5-1に準じて試験を行い、ワレもハガレも全くないものを〇、ワレのみが認められるものを△、ワレおよびハガレが認められるものを×として評価した。なお、試験には、印刷の解像度を720x360dpiとしたものを用いた。
また、実施例16は脂環式モノエポキシドとしてトリエポキシドであるエポキシヘキサヒドロフタル酸ジエポキシステアリルを含有しており、同様に保存安定性、硬化性および密着性に加えて柔軟性にも優れることが分かる。重合時において架橋密度が過度になると柔軟性に劣ると考えられることから、この柔軟性に優れるという事実により、エポキシヘキサヒドロフタル酸ジエポキシステアリルの側鎖のエポキシが反応に関与していないことが推測される。
(1) 光酸発生剤、顔料、並びに、光カチオン重合性化合物として、単官能エポキシ化合物、二官能エポキシ化合物、単官能オキセタン化合物および二官能オキセタン化合物を含有することを特徴とする光カチオン硬化性塗装面用インクジェットインク。
(2) 前記光カチオン硬化性塗装面用インクジェットインク中の、
前記単官能エポキシ化合物の含有濃度が20~50重量%、
前記二官能エポキシ化合物の含有濃度が20~50重量%、
前記単官能オキセタン化合物の含有濃度が5~20重量%、
および前記二官能オキセタン化合物の含有濃度が5~20重量%、
であることを特徴とする(1)記載の光カチオン硬化性塗装面用インクジェットインク。
(3) 前記単官能エポキシ化合物が脂環式の単官能エポキシ化合物であることを特徴とする(1)または(2)記載の光カチオン硬化性塗装面用インクジェットインク。
(4) 前記二官能エポキシ化合物が脂環式の二官能エポキシ化合物であることを特徴とする(1)から(3)のいずれかに記載の光カチオン硬化性塗装面用インクジェットインク。
(5) 前記顔料が、無機顔料であることを特徴とする(1)から(4)のいずれかに記載の光カチオン硬化性塗装面用インクジェットインク。
(6) (1)から(5)のいずれかに記載の光カチオン硬化性塗装面用インクジェットインクをインクジェット方式により印刷し、波長210~280nmの紫外線を含む光により硬化させたことを特徴とする印刷物。
Claims (14)
- 光酸発生剤、顔料、単官能エポキシ化合物(エポキシ基を有するオルガノシロキサンを除く。)、二官能エポキシ化合物、単官能オキセタン化合物および二官能オキセタン化合物を含有することを特徴とする光カチオン硬化性インクジェットインク。
- 前記光カチオン硬化性インクジェットインク中の、
前記単官能エポキシ化合物の含有濃度が20~50重量%、
前記二官能エポキシ化合物の含有濃度が20~50重量%、
前記単官能オキセタン化合物の含有濃度が5~20重量%、
および前記二官能オキセタン化合物の含有濃度が5~20重量%、
であることを特徴とする請求項1記載の光カチオン硬化性インクジェットインク。 - 前記単官能エポキシ化合物が脂環式モノエポキシドを含むことを特徴とする請求項1または2記載の光カチオン硬化性インクジェットインク。
- 前記脂環式モノエポキシドが脂環式モノエポキシドのモノカルボン酸エステルを含むことを特徴とする請求項3に記載の光カチオン硬化性インクジェットインク。
- 前記脂環式モノエポキシドがエポキシヘキサヒドロフタル酸の高級アルコールジエステルを含むことを特徴とする請求項3に記載の光カチオン硬化性インクジェットインク。
- 前記脂環式モノエポキシドが脂環式モノエポキシドのモノカルボン酸エステルおよびエポキシヘキサヒドロフタル酸の高級アルコールジエステルを含むことを特徴とする請求項3に記載の光カチオン硬化性インクジェットインク。
- 前記二官能エポキシ化合物が脂環式二官能エポキシ化合物を含むことを特徴とする請求項1から6のいずれか一項に記載の光カチオン硬化性インクジェットインク。
- 前記顔料が、無機顔料を含むことを特徴とする請求項1から7のいずれか一項に記載の光カチオン硬化性インクジェットインク。
- 45℃で3日間静置した場合の粘度増加率が0%以上9%以下であることを特徴とする請求項1から8のいずれか一項に記載の光カチオン硬化性インクジェットインク。
- 前記顔料の少なくとも一部と、その他の成分の少なくとも一部を混合して顔料分散液を得る混合分散工程と、
前記顔料分散液に残りの成分を添加する後添加工程とを含む、請求項1から9のいずれか一項に記載の光カチオン硬化性インクジェットインクの製造方法。 - 前記二官能エポキシ化合物を前記後添加工程でのみ添加する、請求項10に記載の光カチオン硬化性インクジェットインクの製造方法。
- 請求項1から9のいずれか一項に記載の光カチオン硬化性インクジェットインクを、基材に付着させる工程と、
付着させた前記光カチオン硬化性インクジェットインクにエネルギー線を照射して硬化させる工程とを含む印刷物の製造方法。 - 請求項12に記載の印刷物の製造方法により得られた印刷物。
- 前記基材上の、硬化した前記光カチオン硬化性インクジェットインクの最大インク厚みが10μm以上30μm以下である請求項13に記載の印刷物。
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