WO2009148124A1 - 光硬化型インクジェット印刷用インク組成物及び印刷物 - Google Patents
光硬化型インクジェット印刷用インク組成物及び印刷物 Download PDFInfo
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- WO2009148124A1 WO2009148124A1 PCT/JP2009/060262 JP2009060262W WO2009148124A1 WO 2009148124 A1 WO2009148124 A1 WO 2009148124A1 JP 2009060262 W JP2009060262 W JP 2009060262W WO 2009148124 A1 WO2009148124 A1 WO 2009148124A1
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- ink composition
- acrylate
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- compound
- photocurable
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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
- C09D11/02—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
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0023—Digital printing methods characterised by the inks used
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
Definitions
- the present invention relates to a photocurable ink composition for inkjet printing and a printed matter. More specifically, it is excellent in curability by light emitting diode (LED) light, has good adhesion to polyvinyl chloride sheets such as tarpaulin and vinyl chloride resin sheets, can sufficiently suppress cockling, and has low viscosity.
- the present invention relates to a photocurable ink composition for ink jet printing and a printed matter, which have both a high flash point and are capable of satisfying both ejection properties from the ejection head and safety.
- the ink jet recording system has made it possible to produce printed matter with high image quality by using inks each imparting optimum performance to a wide variety of substrates. Furthermore, taking advantage of the fact that a printing plate is unnecessary, printing can be performed very easily and inexpensively, and it can be applied to a wide substrate called a wide format. Therefore, taking advantage of such features, recently, there are increasing opportunities for use in the field of production such as outdoor large-scale advertisements that require a large image area.
- a tough polyvinyl chloride sheet that can withstand outdoor use such as a sheet made of a vinyl chloride resin itself or a tarpaulin sheet of a composite material, is used.
- the oil-type thing with favorable adhesiveness with respect to a base material is mainly used (for example, refer patent document 1).
- the oil-based ink composition for ink jet printing sometimes causes environmental problems such as volatilization of an organic solvent and the like, which deteriorates the working environment and the natural environment. For this reason, a photocurable ink composition for inkjet printing that does not use a volatile component has been proposed.
- the ink composition in order for the above-mentioned outdoor advertisement or the like to withstand wind and rain, the ink composition must also be able to form a tough film.
- those that can form a tough film with a photocurable material generally have a high film hardness and tend to have poor adhesion to a substrate. Therefore, in such an ink composition, in order to improve the adhesion to the substrate, a method of partially incorporating a component that dissolves the substrate into the ink is employed.
- flammable liquid category 4 flash point is over 60 ° C and over 93 ° C
- GHS Globally Harmonized System of Classification and Labeling of Chemicals
- the object of the present invention is light that is excellent in curability to light emitting diode (LED) light, has good adhesion to polyvinyl chloride sheets such as tarpaulin and vinyl chloride resin sheets, and can sufficiently suppress cockling.
- LED light emitting diode
- polyvinyl chloride sheets such as tarpaulin and vinyl chloride resin sheets
- cockling cockling
- an object is to achieve both good dischargeability at room temperature and safety such as low flammability by maintaining a high flash point while having low viscosity.
- a photocurable ink composition for inkjet printing which contains an acrylated amine compound having a functional group and two amino groups, and contains a compound that exhibits an initiator function by light having a wavelength of 450 to 300 nm as a photopolymerization initiator.
- an initiator function by light having a wavelength of 450 to 300 nm as a photopolymerization initiator.
- inkjet inks using an acrylated amine compound having two photopolymerizable functional groups and two amino groups in the molecule generally have high viscosity.
- the ink used in ink jet printing is required to have a performance (ejection performance) that is quickly filled into the nozzle of the ejection head and ejects with less force. It is difficult. Therefore, it is necessary to reduce the viscosity by using a photopolymerizable compound component that lowers the ink viscosity.
- the photo-curable ink composition for ink jet printing previously proposed by the present inventors described above, when using a photopolymerizable compound component used for lowering the viscosity, causes GHS. It belongs to the flammable liquid category 3 (flash point is 23 ° C. or higher and 60 ° C. or lower). For this reason, there is room for improvement in order to further increase the flash point.
- the present inventors use 2-methoxyethyl acrylate and / or 2-ethoxyethyl acrylate as a photopolymerizable compound for reducing the viscosity.
- 2-methoxyethyl acrylate and / or 2-ethoxyethyl acrylate as a photopolymerizable compound for reducing the viscosity.
- the present invention relates to (1) a photocurable inkjet printing ink composition containing at least a photopolymerizable compound, a photopolymerization initiator, and a sensitizer, and the photopolymerizable compound includes 2-methoxyethyl acrylate and / or Or 2-ethoxyethyl acrylate, N-vinylcaprolactam, and an acrylated amine compound having two photopolymerizable functional groups and two amino groups in the molecule,
- the content of 2-ethoxyethyl acrylate is 20 to 50% by mass in total in the ink composition for photocurable inkjet printing
- the photopolymerization initiator functions as an initiator by light having a wavelength of 450 to 300 nm.
- a sensitizing function is exhibited by light having a wavelength of 400 nm or more.
- those that contain compounds relates to a photocurable ink composition for ink-jet printing which flash point was measured using a SETA sealed flash point measuring device by the method based on JIS K2256 is equal to or in excess of 60 ° C..
- the present invention also provides (2) the above acrylated amine compound wherein the two photopolymerizable functional groups are (meth) acryloyl groups and the amine value is 130 to 142 KOHmg / g.
- the present invention also relates to (3) the photocurable ink composition for ink jet printing according to the above item (1) or (2), wherein the viscosity at a liquid temperature during ink jet printing is 20 mPa ⁇ s or less.
- the present invention also relates to (4) the photocurable ink composition for inkjet printing according to the above item (1), (2) or (3), which further contains a pigment.
- the present invention also provides (5) the photocurable ink composition for ink jet printing described in the above item (1), (2), (3) or (4) on a polyvinyl chloride sheet.
- the present invention relates to a printed matter obtained by printing with a film thickness of 20 ⁇ m and then photocuring.
- the photocurable ink composition for ink jet printing of the present invention and the printed matter obtained using the same will be described in detail.
- the present invention is a photocurable ink composition for inkjet printing containing at least a photopolymerizable compound, a photopolymerization initiator, and a sensitizer. Then, 2-methoxyethyl acrylate and / or 2-ethoxyethyl acrylate is used as the photopolymerizable compound constituting the photocurable inkjet ink composition of the present invention.
- the conventional photopolymerizable compounds used in the photocurable ink composition for ink jet printing those having a low viscosity generally have good curability against light emitting diode light, but have a tendency to have a low flash point.
- the flash point often decreases at the same time.
- 2-methoxyethyl acrylate and 2-ethoxyethyl acrylate do not have a low flash point for their low viscosity, and can maintain good curability for light-emitting diode light.
- the present invention has been able to provide an ink composition that is excellent in curability against light-emitting diode light, and further excellent in adhesion and cockling prevention properties.
- the content of 2-methoxyethyl acrylate and / or 2-ethoxyethyl acrylate is 20 to 50% by mass in total in the photocurable ink composition for inkjet printing, and preferably 30 to 50% by mass. %.
- the content is less than 20% by mass, the effect of lowering the viscosity of the ink cannot be sufficiently obtained while maintaining high flash point and curability against light emitting diode light.
- the said content exceeds 50 mass%, flash point will fall.
- photopolymerizable compound constituting the photocurable inkjet ink composition of the present invention in order to further improve the adhesion to the polyvinyl chloride sheet and cockling, two photopolymerizable functional groups and An acrylated amine compound having 2 amino groups (acrylated amine synergist) is used.
- an acrylated amine compound having 2 amino groups acrylated amine synergist
- photopolymerizable functional group the functional group which can superpose
- photopolymerizable functional groups include a photopolymerizable functional group in a narrow sense that directly activates by light irradiation and undergoes a photopolymerization reaction, or light when irradiated with light coexisting with a photopolymerizable functional group and a photopolymerization initiator. Any of the photopolymerizable functional groups in a broad sense that the polymerization reaction is initiated and accelerated by the action of the active species generated from the polymerization initiator is included.
- Examples of the photopolymerizable functional groups include those having photoradical polymerization reactivity such as ethylenic double bonds, those having photocationic polymerization and photoanion polymerization reactivity such as cyclic ether groups such as epoxy groups, etc. Can be mentioned. Especially, what has ethylenic double bonds, such as a (meth) acryloyl group, a vinyl group, an allyl group, is preferable, and a (meth) acryloyl group is more preferable.
- the (meth) acryloyl group means an acryloyl group or a methacryloyl group.
- the two photopolymerizable functional groups are preferably (meth) acryloyl groups, and the amine value is preferably 130 to 142 KOHmg / g.
- the amine value means an amine value per gram of the solid content
- a 0.1N hydrochloric acid aqueous solution is used, and potentiometric titration (for example, COMMITE (AUTO TITRATOR COM-900, BURET B-900, TITSTATIONK-900), manufactured by Hiranuma Sangyo Co., Ltd.) and then converted to an equivalent amount of potassium hydroxide.
- potentiometric titration for example, COMMITE (AUTO TITRATOR COM-900, BURET B-900, TITSTATIONK-900), manufactured by Hiranuma Sangyo Co., Ltd.
- the acrylated amine compound is preferably a compound obtained by reacting a bifunctional (meth) acrylate with an amine compound from the viewpoint of the effect of the present invention.
- the bifunctional (meth) acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, and propylene glycol.
- Alkylene glycol di (meth) acrylates such as di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate; di (meth) acrylate of bisphenol A ethylene oxide adduct, Di (meth) acrylate of ethylene oxide adduct of bisphenol F, di (meth) acrylate of ethylene oxide adduct of bisphenol S, di (meth) acrylate of ethylene oxide adduct of thiobisphenol, brominated bisphenol Bisphenol alkylene oxide adduct di (meth) acrylate such as di (meth) acrylate of ethylene oxide adduct of A; Polyalkylene glycol di (meth) acrylate such as polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate Di (meth) acrylate of hydroxypivalic acid neopentyl glyco
- Examples of the amine compound include benzylamine, phenethylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, n-pentylamine, isopentylamine, n-hexylamine, cyclohexylamine, and n-heptyl.
- Monofunctional amine compounds such as amine, n-octylamine, 2-ethylhexylamine, n-nonylamine, n-decylamine, n-dodecylamine, n-tetradecylamine, n-hexadecylamine, n-octadecylamine, diethylenetriamine, Triethylenetetramine, tetraethylenepentamine, 1,6-hexamethylenediamine, 1,8-octamethylenediamine, 1,12-dodecamethylenediamine, o-phenylenediamine, p-phenylenediene Min, m-phenylenediamine, o-xylylenediamine, p-xylylenediamine, m-xylylenediamine, menthanediamine, bis (4-amino-3-methyl) cyclohexylnomethane, isophoronediamine, 1,3- Men
- acrylated amine compound a compound obtained by reacting 1,6-hexanediol di (meth) acrylate with an amine compound is preferably used.
- Specific examples include CN371 (manufactured by Sartomer), EB-7100 (EBECRYL 7100, manufactured by Daicel Cytec), and the like.
- the content of the acrylated amine compound is preferably 5 to 20% by mass, and more preferably 10 to 20% by mass in the photocurable ink composition for ink jet printing.
- the content is less than 5% by mass, the adhesion to the polyvinyl chloride sheet is lowered, and cockling is likely to occur.
- it exceeds 20 mass% the problem that an ink viscosity becomes high may generate
- N-vinylcaprolactam is used as a photopolymerizable compound constituting the photocurable inkjet ink composition of the present invention in order to further improve the adhesion to the polyvinyl chloride sheet.
- the content of the N-vinylcaprolactam is preferably 1 to 30% by mass, more preferably 10 to 20% by mass in the photocurable ink composition for inkjet printing. If the said content is less than 1 mass%, the adhesiveness to a polyvinyl chloride sheet may fall. On the other hand, when it exceeds 30 mass%, the problem that an ink viscosity becomes high may generate
- the content of the present invention in particular, a content that does not lower the flash point, and other photopolymerizability other than the specific monomer described above. It is also possible to use a compound in combination.
- photopolymerizable compounds monomers, prepolymers, oligomers and the like can be used without particular limitation as long as they are ethylenic double bond-containing compounds.
- the other photopolymerizable compounds include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, Ethoxylated 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, ethoxylated neopentyl glycol di (meth) acrylate, propoxylated neopentyl glycol di (meth) acrylate, tripropylene glycol di ( (Meth) acrylate, polypropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tetraethylene glycol di (meth) acrylate Relate, 2-n-butyl
- a photopolymerization initiator that constitutes the photocurable ink composition for inkjet printing of the present invention
- a photopolymerization initiator compound that exhibits an initiator function by light having a wavelength of 450 to 300 nm
- the phrase “initiator function is manifested by light having a wavelength of 450 to 300 nm” means having light absorption characteristics over the entire wavelength range of 450 to 300 nm.
- photopolymerization initiator examples include 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, and 2- (p-methoxyphenyl).
- the content of the photopolymerization initiator is preferably in the range of 3 to 20% by mass, more preferably in the range of 3 to 13% by mass in the photocurable ink composition for inkjet printing.
- the content of the photopolymerization initiator is less than 3% by mass, curability to light emitting diode (LED) light is not sufficient.
- LED light emitting diode
- a sensitizer that constitutes the photocurable ink composition for inkjet printing of the present invention
- a sensitizer compound that exhibits a sensitization function by light having a wavelength of 400 nm or more
- the above-mentioned “sensitization function is exhibited by light having a wavelength of 400 nm or more” means having light absorption characteristics in a wavelength region of 400 nm or more.
- the sensitizer include anthracene derivatives such as 9,10-dibutoxyanthracene, 9,10-diethoxyanthracene, 9,10-dipropoxyanthracene, and 9,10-bis (2-ethylhexyloxy) anthracene.
- Examples include thioxanthone sensitizers such as 2,4-diethylthioxanthone, 2-isopropylthioxanthone, and 4-isopropylthioxanthone.
- thioxanthone sensitizers such as 2,4-diethylthioxanthone, 2-isopropylthioxanthone, and 4-isopropylthioxanthone.
- Representative examples of commercially available products include DBA and DEA (manufactured by Kawasaki Chemical Industries) as anthracene derivatives, and DETX and ITX (manufactured by LAMBSON) as thioxanthone sensitizers.
- the content of such a sensitizer is preferably in the range of 0.5 to 3% by mass in the photocurable ink composition for inkjet printing.
- the content of the sensitizer is less than 0.5% by mass, curability to light emitting diode (LED) light is not sufficient.
- LED light emitting diode
- the photocurable ink composition for ink jet printing may contain a colorant as required.
- the colorant those conventionally used in photocurable ink compositions for ink jet printing can be used without particular limitation, but pigments that are well dispersed in the ink composition and have excellent light resistance are preferably used. It is done.
- the pigment may be either an organic pigment or an inorganic pigment.
- organic pigments include dye lake pigments, azo, benzimidazolone, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigo, thioindico, perylene, perinone, diketopyrrolopyrrole.
- the inorganic pigment include carbon black, titanium oxide, bengara, graphite, iron black, chromium oxide green, and aluminum hydroxide.
- a preferable content when using a pigment is 1 to 20% by mass in the photocurable inkjet printing ink composition.
- the content of the pigment is less than the above range, the image quality of the obtained printed matter tends to deteriorate.
- the above range is exceeded, the viscosity characteristics of the photocurable ink composition for inkjet printing tend to be adversely affected.
- a pigment dispersant in order to improve the dispersibility of the pigment and the storage stability of the ink composition.
- a pigment dispersant those conventionally used can be used without particular limitation, and among them, a polymer dispersant is preferably used.
- examples of such pigment dispersants include carbodiimide dispersants, polyesteramine dispersants, fatty acid amine dispersants, modified polyacrylate dispersants, modified polyurethane dispersants, multi-chain polymer nonionic dispersants, Examples thereof include a polymer ion activator. These pigment dispersants can be used alone or in admixture of two or more.
- the content of the pigment dispersant is usually 1 to 200 parts by mass, preferably 1 to 60 parts by mass with respect to 100 parts by mass of the total pigment used.
- the content of the pigment dispersant is less than 1 part by mass, the pigment dispersibility and the storage stability of the ink composition are lowered.
- it can contain over 200 mass parts, there may be no difference in an effect.
- the photocurable ink composition for ink-jet printing of the present invention may contain a solvent as long as the flash point of the photocurable ink composition for ink-jet printing can be maintained above 60 ° C. .
- a solvent having a boiling point of 150 to 220 ° C. at normal pressure (1013 hPa) can be preferably used.
- Specific examples include an ester organic solvent, an ether organic solvent, an ether ester organic solvent, a ketone organic solvent, an aromatic hydrocarbon solvent, and a nitrogen-containing organic solvent.
- the content of the organic solvent in the photocurable inkjet printing ink composition is preferably 5% by mass or less, more preferably 2% by mass or less, and particularly preferably 0% by mass.
- additives can be added to the photocurable ink composition for inkjet printing of the present invention in order to develop various functions as required. Specifically, light stabilizer, surface treatment agent, surfactant, viscosity reducing agent, antioxidant, anti-aging agent, crosslinking accelerator, polymerization inhibitor, plasticizer, preservative, pH adjuster, antifoaming Agents, moisturizers and the like.
- the ink composition for photocurable ink jet printing of the present invention obtained from the above constituent materials has a flash point of more than 60 ° C. measured using a setter hermetic flash point measuring device by a method according to JIS K2265. is there.
- the photocurable ink composition for inkjet printing of the present invention can be at a level corresponding to the flammable liquid category 4 referred to as GHS, and is excellent in safety such as low flammability. .
- the photocurable ink composition for ink jet printing according to the present invention has a viscosity at a liquid temperature of 20 mPa ⁇ s or less at the time of ink jet printing from the viewpoint of obtaining good ink ejection performance and a thick print coating film. It is preferably 5 to 10 mPa ⁇ s, more preferably 5 to 8 mPa ⁇ s.
- the liquid temperature at the time of ink jet printing is the temperature of the ink composition under the following conditions. That is, when performing ink jet printing at room temperature (25 ° C.) using the photocurable ink composition for ink jet printing of the present invention, the liquid temperature at the time of printing is room temperature.
- the temperature of the ink tank of the ink jet printing apparatus is heated and printed at a temperature higher than room temperature
- the liquid temperature at the time of printing is mostly room temperature, but is preferably less than 60 ° C.
- the viscosity at the liquid temperature during ink jet printing is measured using an E-type viscometer (trade name: RE100L viscometer, manufactured by Toki Sangyo Co., Ltd.).
- the photocurable ink composition for ink jet printing of the present invention is curable with respect to light emitting diode (LED) light, adhesion to a vinyl chloride sheet, anti-cockling property, discharge property such as low viscosity, and safety such as low flammability. It is excellent in all of sex. These effects are obtained by including the above-mentioned specific photopolymerizable compound, photopolymerization initiator and sensitizer.
- LED light emitting diode
- the method for preparing the photocurable ink composition for ink jet printing of the present invention is not particularly limited, and it can be prepared by adding all the materials described above and mixing them with a bead mill or a three roll mill.
- a concrete base ink is obtained in advance by mixing a pigment, a pigment dispersant, and a photopolymerizable compound, and a photopolymerizable compound, a photopolymerization initiator, It can also be prepared by adding components such as a sensitizer.
- a polyvinyl chloride sheet such as tarpaulin or a vinyl chloride resin sheet is preferable, but conventionally printed on an ink composition for ultraviolet ink jet printing.
- Any substrate paper, plastic film, capsule, gel, metal foil, glass, wood, cloth, etc. can be printed without problems.
- the photocurable ink jet printing ink composition was ejected onto a base material and then landed on the base material.
- the photocurable ink composition for ink jet printing is exposed to light and cured.
- ejection (image printing) onto a substrate is performed by supplying the photocurable ink composition for ink jet printing to a printer head of a printer apparatus for ink jet recording system, and coating the film onto the recording material from the printer head. It can be carried out by discharging the ink composition so as to have a thickness of 1 to 20 ⁇ m.
- Exposure to light and curing (curing of an image) can be performed by irradiating the ink composition applied to a recording material as an image with light.
- a printer apparatus for an ink jet recording system that prints the photocurable ink composition for ink jet printing
- a conventionally used printer apparatus for an ink jet recording system can be used.
- a conductivity imparting agent is further added to the photocurable ink composition for ink jet printing to adjust the conductivity.
- the light source for image curing examples include ultraviolet rays, electron beams, visible rays, and light emitting diodes (LEDs).
- the photocurable ink composition for inkjet printing of the present invention can obtain excellent curability even when an LED is used as a light source. Further, when an LED is used, an image can be cured with low energy without generating ozone.
- the light emitted from the LED is preferably an active energy ray having a wavelength peak in the range of 365 to 420 nm.
- the printed matter thus obtained is also one aspect of the present invention. That is, the present invention is also a printed matter obtained by printing a photo-curable ink jet printing ink composition on a polyvinyl chloride sheet at a film thickness of 1 to 20 ⁇ m and then photo-curing. .
- the photocurable ink composition for inkjet printing according to the present invention has the above-described configuration, it is excellent in curability against light emitting diode (LED) light and has adhesiveness to a polyvinyl chloride sheet such as a tarpaulin or a vinyl chloride resin sheet. It is good, can sufficiently prevent cockling, and is excellent in dischargeability and safety at room temperature. For this reason, the ink composition of this invention can contribute to the safety improvement of photocurable inkjet printing, and size reduction of a printing apparatus.
- LED light emitting diode
- Examples 1 to 9 and Comparative Examples 1 to 8 ⁇ Preparation of photocurable ink composition for inkjet printing> A pigment (pigment blue 15: 4), a pigment dispersant (Ajisper PB821, manufactured by Ajinomoto Co., Inc.) and a photopolymerizable compound (propoxylated neopentylglycol diacrylate) have a blending ratio (mass ratio) of 22 / 8.8 / 69. 2 to obtain a mixture. The mixture was dispersed using an Eiger mill (using zirconia beads having a diameter of 0.5 mm as a medium) to obtain a concrete base. Using the obtained concentrated base, each component was blended so as to have the blending composition (% by mass) shown in Table 1, and the photocurable ink compositions for inkjet printing of Examples 1 to 9 and Comparative Examples 1 to 8 were prepared. Obtained.
- a pigment pigment blue 15: 4
- a pigment dispersant Ajisper PB821, manufactured by Ajin
- LED curing rate Evaluation was performed by the number of times until the surface tack was eliminated under irradiation conditions of 40 mJ / cm 2 per second using an LED lamp manufactured by Foseon Technology.
- Examples 1 to 9 are cases where a low power lamp such as a light emitting diode (LED) is used even though the flash point exceeds 60 ° C. It can be seen that it has practical curability and is excellent in adhesion and cockling prevention.
- This includes 2-methoxyethyl acrylate and / or 2-ethoxyethyl acrylate, N-vinylcaprolactam as a photopolymerizable compound, and an acrylated amine having two photopolymerizable functional groups and two amino groups in the molecule. This is brought about by the constitution of the present invention containing a compound.
- An ink jet recording apparatus provided with a piezo type ink jet nozzle and an ink composition for photocurable ink jet printing of Examples 1 to 9 and Comparative Examples 1 to 8 described above at an ambient temperature of 25 ° C. every 24 hours.
- the temperature of the ink composition was 25 ° C.
- printing was continuously carried out on a polyvinyl chloride sheet (Frontlit Glossy 120 g, manufactured by Cooley) using them under an atmospheric temperature of 25 ° C. to obtain each image.
- a polyvinyl chloride sheet Francell Glossy 120 g, manufactured by Cooley
- the photocurable ink composition for inkjet printing of the present invention has a flash point exceeding 60 ° C., and is an ink classified as a flammable liquid category 4 referred to as GHS. Even when a low output lamp such as an ultraviolet LED is used while maintaining a low viscosity, it has practical curability, adhesion and cockling properties. For this reason, the ink composition of the present invention can contribute to the improvement of the safety of the photocurable ink jet printing and the miniaturization of the printing apparatus.
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- Engineering & Computer Science (AREA)
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- Wood Science & Technology (AREA)
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- Inks, Pencil-Leads, Or Crayons (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
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Abstract
Description
しかし、油性型のインクジェット印刷用インク組成物では、有機溶剤等が揮発して作業環境や自然環境を悪化させる等の環境問題を引き起こすことがあった。このため、揮発成分を用いない光硬化型のインクジェット印刷用インク組成物が提案されるようになっている。
しかし、この様なインクジェットインキを使用して印刷物を製造した場合、ポリ塩化ビニル系シートへの密着性は良好となるが、コックリング(基材がたわむ現象)が起こりやすくなるという問題を有している。
この提案により、発光ダイオード光に対する硬化性や印刷性能は改善され良好となった。
また、本発明は、(3)インクジェット印刷時の液温における粘度が20mPa・s以下である上記(1)項又は(2)項に記載の光硬化型インクジェット印刷用インク組成物に関する。
また、本発明は、(5)ポリ塩化ビニル系シートに上記(1)項、(2)項、(3)項又は(4)項に記載の光硬化型インクジェット印刷用インク組成物を1~20μmの膜厚で印刷した後、光硬化して得られることを特徴とする印刷物に関する。
以下、本発明の光硬化型インクジェット印刷用インク組成物及びそれを用いて得られる印刷物について具体的に説明する。
なお、本明細書において、(メタ)アクリロイル基とは、アクリロイル基又はメタクリロイル基を意味する。
上記2官能(メタ)アクリレートとしては、例えば、1,4-ブタンジオールジ(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、1,9-ノナンジオールジ(メタ)アクリレート、プロピレングリコールジ(メタ)アクリレート、1,3-ブチレングリコールジ(メタ)アクリレート、ネオペンチルグリコールジ(メタ)アクリレート等のアルキレングリコールジ(メタ)アクリレート;ビスフェノールAのエチレンオキサイド付加物のジ(メタ)アクリレート、ビスフェノールFのエチレンオキサイド付加物のジ(メタ)アクリレート、ビスフェノールSのエチレンオキサイド付加物のジ(メタ)アクリレート、チオビスフェノールのエチレンオキサイド付加物のジ(メタ)アクリレート、臭素化ビスフェノールAのエチレンオキサイド付加物のジ(メタ)アクリレート等のビスフェノールアルキレンオキシド付加物ジ(メタ)アクリレート;ポリエチレングリコールジ(メタ)アクリレート、ポリプロピレングリコールジ(メタ)アクリレート等のポリアルキレングリコールジ(メタ)アクリレート;ヒドロキシピバリン酸ネオペンチルグリコールエステルのジ(メタ)アクリレート;等が挙げられる。なかでも、1,6-ヘキサンジオールジ(メタ)アクリレートが好ましい。
なお、本明細書において、(メタ)アクリレートとは、アクリレート又はメタクリレートを意味する。
なお、上記「400nm以上の波長の光により増感機能が発現する」とは、400nm以上の波長域で光吸収特性を有することをいう。
上記増感剤としては、例えば、9,10-ジブトキシアントラセン、9,10-ジエトキシアントラセン、9,10-ジプロポキシアントラセン、9,10-ビス(2-エチルヘキシルオキシ)アントラセン等のアントラセン誘導体、2,4-ジエチルチオキサントン、2-イソプロピルチオキサントン、4-イソプロピルチオキサントン等のチオキサントン系増感剤を挙げることができる。市販品の代表例としては、アントラセン誘導体としては、DBA、DEA(川崎化成工業社製)、チオキサントン系増感剤としては、DETX、ITX(LAMBSON社製)等が例示できる。
また、本発明の光硬化型インクジェット印刷用インク組成物には、必要に応じ着色剤を含有させることができる。上記着色剤としては、光硬化型インクジェット印刷用インク組成物において従来から使用されているものを特に制限なく使用できるが、インク組成物に良好に分散し、耐光性の優れた顔料が好適に用いられる。上記顔料としては、有機顔料又は無機顔料のいずれであってもよい。
顔料分散剤としては、従来から使用されているものを特に制限なく使用できるが、その中でも高分子分散剤を使用することが好ましい。このような顔料分散剤としては、カルボジイミド系分散剤、ポリエステルアミン系分散剤、脂肪酸アミン系分散剤、変性ポリアクリレート系分散剤、変性ポリウレタン系分散剤、多鎖型高分子非イオン系分散剤、高分子イオン活性剤等が挙げられる。これら顔料分散剤は単独で又は2種以上を混合して使用できる。
本明細書において、上記インクジェット印刷時の液温とは、以下の条件によるインク組成物の温度である。すなわち、本発明の光硬化型インクジェット印刷用インク組成物を使用して室温(25℃)でインクジェット印刷をする場合は、上記印刷時の液温とは室温である。一方、インクジェット印刷装置のインクタンクを加熱して、室温より高い温度で印刷する場合には、実際に印刷するときに加温されているインクタンクの温度である。
なお、上記印刷時の液温は、多くは室温であるが、60℃未満であることが好ましい。
上記インクジェット印刷時の液温における粘度とは、E型粘度計(商品名:RE100L型粘度計、東機産業社製)を用いて測定したものである。
本発明の光硬化型インクジェット印刷用インク組成物を印字する基材としては、ターポリンや塩化ビニル樹脂シート等のポリ塩化ビニル系シートが好ましいが、従来から紫外線インクジェット印刷用インク組成物に印字されている基材(紙、プラスチックフィルム、カプセル、ジェル、金属箔、ガラス、木材、布等)であれば問題なく印字できる。
例えば、基材への吐出(画像の印字)は、上記光硬化型インクジェット印刷用インク組成物をインクジェット記録方式用プリンター装置のプリンターヘッドに供給し、このプリンターヘッドから被記録材に塗膜の膜厚が1~20μmとなるように該インク組成物を吐出することにより行うことができる。光での露光、硬化(画像の硬化)は、画像として被記録材に塗布された該インク組成物に光を照射することにより行うことができる。
すなわち、本発明はまた、ポリ塩化ビニル系シートに、上記光硬化型インクジェット印刷用インク組成物を1~20μmの膜厚で印刷した後、光硬化して得られることを特徴とする印刷物である。
<顔料分散剤>
アジスパー(登録商標)PB821(味の素株式会社製)
<光重合性化合物>
CN371;
(REACTIVE AMINE COINITIATOR、SARTOMER社製、アミン価137、アミノ基2個とアクリロイル基2個含有)
CN373;
(REACTIVE AMINE COINITIATOR、SARTOMER社製、アミン価235、アミノ基1個とアクリロイル基2個含有)
HDODA;1,6-ヘキサンジオールアクリレート
LA:ラウリルアクリレート
SR395:イソデシアルアクリレート
DEAA:ジエチルアクリルアミド
V-CAP;N-ビニルカプロラクタム
(PO)NPGDA;プロポキシ化ネオペンチルグリコールジ(メタ)アクリレート
<光重合開始剤>
TPO;2,4,6-trimethylbenzoyl diphenyl phosphine oxide(LAMBERTI社製)
IRGACURE819;ビス(2,4,6-トリメチルベンゾイル)-フェニルフォスフィンオキサイド(チバ・スペシャリティ・ケミカルズ社製)
IRGACURE907(開始剤機能発現波長260~340nm、240nm以下、チバ・スペシャリティ・ケミカルズ社製)
<増感剤>
DETX;2,4-ジエチルチオキサントン
<添加剤>
BYK-377(シリコーン添加剤、BYK Chemie社製)
<光硬化型インクジェット印刷用インク組成物の調製>
顔料(ピグメントブルー15:4)と顔料分散剤(アジスパーPB821、味の素社製)と光重合性化合物(プロポキシ化ネオペンチルグリコールジアクリレート)とを配合比率(質量比)が22/8.8/69.2となるように配合して混合物を得た。該混合物を、アイガーミル(メディアとして直径0.5mmのジルコニアビーズを使用)を用いて分散させてコンクベースを得た。得られたコンクベースを用いて、表1の配合組成(質量%)となるように各成分を配合し、実施例1~9、比較例1~8の光硬化型インクジェット印刷用インク組成物を得た。
今回行う印刷試験では、印刷時のインク組成物の液温が25℃であるため、実施例1~9、比較例1~8で得られた光硬化型インクジェット印刷用インク組成物について、E型粘度計(商品名:RE100L型粘度計、東機産業社製)を使用して、温度25℃の条件で、粘度を測定した。結果を表2に示す。
実施例1~9、比較例1~8で得られた光硬化型インクジェット印刷用インク組成物について、JIS K2265に準拠した方法に従って、セタ密閉式引火点測定試験器を使用して、アルミニウムブロックで一定温度に保持し、引火点の測定を行った。結果を表2に示す。
実施例1~9、比較例1~8で得られた光硬化型インクジェット印刷用インク組成物をポリ塩化ビニルシート(Flontlit Grossy 120g、Cooley社製)に#4のバーコーターで塗布し、次いでヘレウス社製Z-8ランプ(水銀ランプ)又はフォセオン・テクノロジー社製LEDランプを用いて硬化させた。下記の方法で硬化速度、LED硬化速度、密着性、耐溶剤性を評価した。結果を表2に示す。
ヘレウス社製Z-8ランプ(水銀ランプ)を用いて、60W×23m/min、距離13cm(UV積算光量30mJ/cm2)の照射条件で表面のタックがなくなるまでのパス回数にて評価した。
フォセオン・テクノロジー社製LEDランプにて、1秒間40mJ/cm2となる照射条件で表面のタックがなくなるまでの回数にて評価した。
各塗膜をクロスカットし、セロハンテープによりインキの剥離具合を以下の基準で評価した。
○;塗膜の取られなし
×;塗膜の取られあり
ウエスにMEK(メチルエチルケトン)をしみ込ませたものを指の腹で押さえつけ各塗膜上を5回擦ったときの各塗膜の取られ具合を以下の基準で評価した。
○;塗膜の取られなし
×;塗膜の取られあり
ポリ塩化ビニルシート(Flontlit Grossy 120g、Cooley社製)に#12のバーコーターにて塗布し、UV照射して得られたシートの裏面のしわ(収縮具合)を以下の基準で評価した。
○;非塗工部同様塗工部に収縮がない状態
×;非塗工部に比べ塗工部に収縮があり盛り上がっている状態
25℃の雰囲気温度下に、ピエゾ型インクジェットノズルを備えたインクジェット記録装置と、上記実施例1~9、比較例1~8の光硬化型インクジェット印刷用インク組成物とを24時間おき、装置及びインク組成物の温度を25℃とした。その後25℃の雰囲気温度下で、それらを用いてポリ塩化ビニルシート(Flontlit Grossy 120g、Cooley社製)上へ連続して印字し、各画像を得た。上記各光硬化型インクジェット印刷用インク組成物の吐出性は良好で所定の膜厚(10μm)の画像が得られた。
Claims (5)
- 少なくとも、光重合性化合物、光重合開始剤及び増感剤を含有する光硬化型インクジェット印刷用インク組成物において、
前記光重合性化合物として、2-メトキシエチルアクリレート及び/又は2-エトキシエチルアクリレートと、N-ビニルカプロラクタムと、分子内に2個の光重合性官能基及び2個のアミノ基を有するアクリル化アミン化合物とを含有し、
前記2-メトキシエチルアクリレート及び/又は2-エトキシエチルアクリレートの含有量が、前記光硬化型インクジェット印刷用インク組成物中に合計で20~50質量%であり、
前記光重合開始剤として、波長450~300nmの光により開始剤機能が発現する化合物を含有し、
前記増感剤として、波長400nm以上の光により増感機能が発現する化合物を含有するものであり、
JIS K2256に準拠した方法でセタ密閉式引火点測定装置を用いて測定した引火点が60℃を超える
ことを特徴とする光硬化型インクジェット印刷用インク組成物。 - アクリル化アミン化合物として、2個の光重合性官能基が(メタ)アクリロイル基であり、アミン価が130~142KOHmg/gである化合物を用いる請求項1記載の光硬化型インクジェット印刷用インク組成物。
- インクジェット印刷時の液温における粘度が20mPa・s以下である請求項1又は2記載の光硬化型インクジェット印刷用インク組成物。
- 更に、顔料を含有する請求項1、2又は3記載の光硬化型インクジェット印刷用インク組成物。
- ポリ塩化ビニル系シートに請求項1、2、3又は4記載の光硬化型インクジェット印刷用インク組成物を1~20μmの膜厚で印刷した後、光硬化して得られることを特徴とする印刷物。
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| JP2022003131A (ja) * | 2015-09-14 | 2022-01-11 | マクセル株式会社 | インク組成物及びその製造方法、並びにそのインク組成物を用いたインクジェット用インクセット及びインクジェット印刷システム |
| JP2020059856A (ja) * | 2015-09-14 | 2020-04-16 | マクセルホールディングス株式会社 | インク組成物及びその製造方法、並びにそのインク組成物を用いたインクジェット用インクセット及びインクジェット印刷システム |
| JP2016041820A (ja) * | 2015-10-27 | 2016-03-31 | セイコーエプソン株式会社 | 放射線硬化型インクジェット用インク組成物、インクジェット記録方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2292706B1 (en) | 2014-07-23 |
| EP2292706A4 (en) | 2013-05-29 |
| JPWO2009148124A1 (ja) | 2011-11-04 |
| US20110236647A1 (en) | 2011-09-29 |
| CA2726592A1 (en) | 2009-12-10 |
| EP2292706A1 (en) | 2011-03-09 |
| CA2726592C (en) | 2016-05-31 |
| JP5400772B2 (ja) | 2014-01-29 |
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