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WO2010058816A1 - Composition d'encre à jet d'encre à durcissement par faisceau énergétique - Google Patents

Composition d'encre à jet d'encre à durcissement par faisceau énergétique Download PDF

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Publication number
WO2010058816A1
WO2010058816A1 PCT/JP2009/069627 JP2009069627W WO2010058816A1 WO 2010058816 A1 WO2010058816 A1 WO 2010058816A1 JP 2009069627 W JP2009069627 W JP 2009069627W WO 2010058816 A1 WO2010058816 A1 WO 2010058816A1
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Prior art keywords
oligomer
reactive
mass
ink composition
molecule
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PCT/JP2009/069627
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English (en)
Japanese (ja)
Inventor
克幸 鬼頭
小林　哲
邦彦 小山
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Maxell Ltd
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Hitachi Maxell Ltd
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Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to US13/130,388 priority Critical patent/US20110230582A1/en
Priority to JP2010539249A priority patent/JP5583595B2/ja
Priority to EP09827597.7A priority patent/EP2351799B1/fr
Publication of WO2010058816A1 publication Critical patent/WO2010058816A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an energy ray curable inkjet ink composition. Especially after curing, such as marking films used for decorations such as vehicles, ships, signboards, building walls, etc., with three-dimensional surfaces such as irregularities and curved surfaces, and three-dimensional three-dimensional display members on which printed matter is three-dimensionally formed after printing
  • the present invention relates to an ink-jet ink composition suitable for uses in which stretchability is required for a printed film.
  • a marking film for example, a car wrapping film used for decoration of a vehicle or the like, generally forms a decorative print film with ink on one side of a polymer substrate made of a vinyl chloride resin sheet or the like, and adheres to the other side. It is produced by laminating release sheets via layers.
  • Such a marking film can be directly attached to an object to be decorated such as a vehicle, and is excellent in workability. Therefore, the marking film is becoming popular as an alternative to the conventional marking method by painting.
  • a three-dimensional display member such as an electric signboard is manufactured by printing a printed film made of various characters and images on a base material and then three-dimensionally forming a printed matter with a molding machine.
  • the release sheet is peeled off and the adhesive layer is attached to the surface of the object to be decorated. Since the surface of the film has a three-dimensional shape such as irregularities and curved surfaces, the marking film is likely to be wrinkled, and air is likely to enter between the marking film and the object to be decorated. For this reason, it is necessary to affix a marking film on the surface of a to-be-decorated body, and a printing film may be extended
  • the printed film may be stretched together with the base material by bending at the time of forming. Therefore, in these applications, there is a demand for ink that does not cause cracking or peeling even when the printing film is stretched by, for example, 130% or more.
  • a plate making process is not required, and a printing method using an ink jet method suitable for a small amount of various types of variable printing is used. It is necessary to use an ink having liquid properties suitable for printing and excellent in continuous discharge properties. From the above viewpoint, in order to satisfy the stretchability of the printing film and the continuous ejection property in the ink jet system, a low-viscosity, stretchable water-based or solvent-based ink-jet ink using a dye or pigment as a coloring material is mainly used. It is used.
  • water-based ink-jet inks tend to cause poor image formation due to poor adhesion of ink droplets when printed on a non-water-absorbing substrate such as a polymer substrate.
  • the marking film is used outdoors, but the water-based inkjet ink is inferior in water resistance.
  • solvent-based ink-jet inks are excellent in printability and water resistance on non-water-absorbing substrates such as polymer substrates, but it takes time to dry because the ink needs to be dried after printing.
  • an exhaust system and a solvent recovery mechanism for volatilizing the organic solvent must be provided.
  • solvent-free energy-ray-curable ink-jet inks that cure ink with energy rays such as ultraviolet rays have been developed as industrial ink-jet inks (for example, patents) No. 3619778).
  • energy ray curable ink jet ink radicals are generated by irradiation of energy rays and polymerization is started, so that the polymerization reaction proceeds very quickly and has excellent curability.
  • a solvent since a solvent is not used, it is excellent in the adhesiveness to a base material and quick-drying, and hardly causes environmental pollution.
  • the energy beam curable inkjet ink may be used instead of the water-based or solvent-based inkjet ink. Since the print film is cured by the polymerization reaction of the polymerizable compound, it is necessary to use a polymerizable compound having as good a curing property as possible. Therefore, a hard material having no stretchability as proposed in Japanese Patent No. 3619778 is proposed. There has been a need for printed films. Therefore, a printing film formed using such an energy beam curable inkjet ink is basically not stretchable, and the printing film is easily cracked or peeled off by stretching.
  • Japanese Patent No. 3619778 even in the energy ray curable inkjet ink disclosed in Japanese Patent No. 3619778, the printing film is used in an application in which the printing film is stretched 130% or more together with the base material after curing of the marking film or the three-dimensional display member. The occurrence of cracks and peeling cannot be suppressed.
  • solvent resistance against alcohol or the like is also required, but Japanese Patent No. 3619778 does not discuss such solvent resistance at all.
  • Japanese Patent No. 3619778 it is necessary to use a polyfunctional monomer (bifunctional monomer) as a reactive diluent in order to form adhesiveness, scratch resistance, and a continuous print film (Japanese Patent No. 3619778).
  • 2004-131725 cannot obtain sufficient curability and adhesiveness by such low energy irradiation means. .
  • the object of the present invention is to generate cracks or peeling in the printed film even when the energy ray curable ink-jet ink is applied to an application in which the printed film is stretched together with the substrate after printing a marking film or a three-dimensional display member.
  • Another object of the present invention is to provide an energy ray curable inkjet ink composition.
  • the present invention is an energy ray curable inkjet ink composition
  • a colorant a polymerizable compound, a photopolymerization initiator, and a surface tension modifier
  • the polymerizable compound is A monofunctional monomer having one ethylenic double bond in one molecule; (A) a reactive oligomer having an elongation of 130% or more at 25 ° C. when polymerizing a single oligomer, and having a weight average molecular weight of 800 or more and less than 3,000, (B) a reactive oligomer having an elongation of 130% or more at 25 ° C.
  • One of the reactive oligomer (A) and the reactive oligomer (B) has 2 or less ethylenic double bonds in one molecule, and the other has 2 or more ethylenic double bonds in one molecule.
  • the content of the monofunctional monomer is 40% by mass to 75% by mass with respect to the total mass of the ink composition, and the content of the reactive oligomer (A) is 5% by mass to 35% by mass.
  • the content of the reactive oligomer (B) is 5% by mass or more and 35% by mass or less, and the total content of the reactive oligomer (A) and the reactive oligomer (B) is 10% by mass or more and 40% by mass or less.
  • the photopolymerization initiator is (C) an acylphosphine oxide-based initiator and (D) an at least one initiator selected from the group consisting of ⁇ -aminoalkylphenone-based initiators, An energy ray curable inkjet ink composition is provided.
  • the ink composition of the present invention contains a certain amount of each of a monofunctional monomer having a small reactive point and reactive oligomers (A) and (B) having a high elongation, and the reactive oligomer (A). And (B) has two or less ethylenic double bonds, but the other has two or more ethylenic double bonds, so that it is possible to form a printed film with little cracking or peeling even by stretching. At the same time, the solvent resistance of the printing film can be improved.
  • a printing film having excellent curability and adhesion can be formed by energy irradiation.
  • the viscosity of the ink composition is likely to increase by containing the high molecular weight reactive oligomer (B), but the ink composition of the present invention comprises a monofunctional monomer and a low molecular weight reactive oligomer (A). While containing a certain amount of each, one reactive oligomer has 2 or less ethylenic double bonds, so that a low viscosity suitable for the ink jet system can be achieved. Furthermore, since the ink composition of the present invention contains a monofunctional monomer and reactive oligomers (A) and (B) in a certain amount and a surface tension adjusting agent, the surface tension suitable for the ink jet system. have.
  • the combination of the reactive oligomer (A) and the reactive oligomer (B) is preferably a combination selected from the group consisting of the following (i) to (iii): (I) Reactive oligomer (A): Reactive monofunctional oligomer having one ethylenic double bond in one molecule, Reactive oligomer (B): Having two or more ethylenic double bonds in one molecule Reactive multi-functional oligomer (ii) Reactive oligomer (A): Reactive polyfunctional oligomer having two or more ethylenic double bonds in one molecule, Reactive oligomer (B): Ethylene double in one molecule Reactive monofunctional oligomer having one bond (iii) Reactive oligomer (A): Reactive polyfunctional oligomer having two or more ethylenic double bonds in one molecule, Reactive oligomer (B): In one molecule Reactive bifunctional oligomer having two e
  • the photopolymerization initiator preferably contains an ⁇ -aminoalkylphenone initiator (D) and a thioxanthone initiator (E).
  • D ⁇ -aminoalkylphenone initiator
  • E thioxanthone initiator
  • the surface tension adjusting agent preferably contains at least a silicone compound having a polydimethylsiloxane structure, and more preferably contains a silicone compound having an ethylenic double bond in the molecule. Since the silicone compound has a large surface tension reducing effect and has reactivity, the curability and adhesion can be improved.
  • the ink composition of the present invention may further contain 5% by mass or less of a polyfunctional monomer having two or more ethylenic double bonds. If a small amount of a polyfunctional monomer having many reactive points is contained, an ink composition having further excellent curability and adhesion can be obtained without reducing stretchability.
  • the ink composition of the present invention may further contain a hindered amine compound having a 2,2,6,6-tetramethylpiperidinyl group as an anti-gelling agent.
  • a hindered amine compound having a 2,2,6,6-tetramethylpiperidinyl group as an anti-gelling agent.
  • polymerization is easily initiated by heat and light during storage, and thus storage stability tends to be reduced, but if a hindered amine compound is used, it is cured while maintaining storage stability.
  • An ink composition having excellent properties and adhesion can be obtained.
  • the printing film is stretched together with the base material after printing such as a marking film or a three-dimensional stereoscopic display member, the printing film is excellently stretched without cracking or peeling.
  • Energy beam with excellent solvent resistance, excellent curability and adhesion even when low energy irradiation means is used, and excellent continuous ejection when printing by inkjet method A curable inkjet ink composition can be provided.
  • the energy ray curable inkjet ink composition of the present invention contains a monofunctional monomer having one ethylenic double bond in one molecule, in an amount of 40% by mass to 75% by mass with respect to the total mass of the composition. To do. Since the ink composition of the present invention contains a monofunctional monomer having one ethylenic double bond in one molecule and having a small number of functional groups, the viscosity of the resulting ink composition can be reduced and the monofunctionality can be reduced. Since the monomer has few reactive sites with other polymerizable compounds at the time of polymerization, the characteristics of the reactive oligomers (A) and (B) having a high elongation can be sufficiently exhibited.
  • the polyfunctional monomer having two or more ethylenic double bonds in one molecule is excellent in reactivity, but when only the polyfunctional monomer is used as the monomer, the reactive oligomers (A) and (B), the polyfunctional monomer, As the polymerization proceeds, the hardness of the printed film becomes too high and the high stretchability required for the marking film or the like cannot be satisfied. In addition, since the polyfunctional monomer has a high viscosity, the continuous discharge property tends to be lowered.
  • the ink composition containing a large amount of the reactive oligomers (A) and (B) in order to impart high stretchability to the printed film increases the viscosity, and the inkjet It becomes difficult to prepare a viscosity of 70 mPa ⁇ s or less suitable for the method.
  • sclerosis hardenability and adhesiveness will fall by the fall of reactivity.
  • Examples of monofunctional monomers used in the present invention include amyl (meth) acrylate, isoamyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, lauryl ( (Meth) acrylate, isomyristyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, tridecyl (meth) acrylate, 2-ethylhexyl-diglycol (meth) acrylate, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, Neopentyl glycol (meth) acrylic acid benzoate, butoxyethyl (meth) acrylate, ethoxy-diethylene glycol (meth) acrylate, methoxy-triethylene glycol (meth
  • the monomer may be substituted with a functional group such as phosphorus or fluorine.
  • a functional group such as phosphorus or fluorine.
  • isooctyl (meth) acrylate and phenoxyethyl (meth) acrylate are particularly preferable because of their low viscosity.
  • the ink composition of the present invention comprises a reactive oligomer (A) having an elongation of 130% or more at 25 ° C. when a single oligomer is polymerized, and having a weight average molecular weight of 800 or more and less than 3,000. And a reactive oligomer (B) having an elongation of 130% or more at 25 ° C. when polymerizing the oligomer alone and having a weight average molecular weight of 3,000 or more and 8,000 or less.
  • a reactive oligomer (A) and (B) having such a high elongation rate the printed film is cracked or peeled even in applications where the printed film is stretched 130% or more together with the substrate after curing.
  • the elongation percentage of the oligomer single polymer is less than 130%, even if it contains a monofunctional monomer with few reaction points, a print film having sufficient stretchability cannot be formed, and the print film is stretched after curing. Cracks and flaking are likely to occur.
  • An oligomer with a high elongation rate is preferable because it is excellent in stretchability.
  • the elongation rate is 200% or less. preferable.
  • the weight average molecular weight and elongation of the reactive oligomer used in the present invention can be measured by the method described in the examples below.
  • the weight average molecular weight of the reactive oligomer blended in the ink composition, the number of double bonds possessed by the reactive oligomer, and the elongation can be measured as follows.
  • the ink composition is centrifuged at 10,000 rpm for 4 hours to precipitate the contained pigments and other solids.
  • the obtained supernatant is subjected to GPC, and the weight average molecular weight in terms of polystyrene is determined.
  • the ink composition is centrifuged at 10,000 rpm for 4 hours to precipitate the contained pigments and other particles.
  • the obtained supernatant was subjected to molecular weight fractionation by GPC, and from that, a fractionated liquid A having a weight average molecular weight (polystyrene conversion) of 800 or more and less than 3,000, a weight average molecular weight (polystyrene conversion) of 3,000 or more, Sampling solution B below 8,000 is sampled.
  • a fractionated liquid A having a weight average molecular weight (polystyrene conversion) of 800 or more and less than 3,000, a weight average molecular weight (polystyrene conversion) of 3,000 or more, Sampling solution B below 8,000 is sampled.
  • the iodine value of the aliquots A and B the number of double bonds contained in each is quantified. The iodine value is measured according to the method described in JIS K0070.
  • Each aliquot of iodine value was the I A and I B, respectively, as M A and M B the weight-average molecular weight, respectively, the following equation to determine the respective average number of double bonds D A and D B.
  • D A (I A /253.8) ⁇ (M A / 100)
  • D B (I B /253.8) ⁇ (M B / 100)
  • the reactive oligomer (A) having a weight average molecular weight of 800 or more and less than 3,000 has low viscosity
  • the use of a certain amount of the reactive oligomer (A) improves curability while suppressing an increase in viscosity. be able to. If only the reactive oligomer having a weight average molecular weight of less than 800, the curability is improved, but the printed film becomes too hard, the stretchability is lowered, and the solvent resistance is also lowered.
  • the solvent resistance is lowered or the viscosity is likely to be increased.
  • the stretchability can be improved by using a certain amount of the reactive oligomer (B). Can do. With only the reactive oligomer (A) having a weight average molecular weight of less than 3,000, the stretchability tends to be lowered. On the other hand, when the weight average molecular weight is larger than 8,000, even if a certain amount of the monofunctional monomer and the low molecular weight reactive oligomer (A) is contained, the curability is lowered and the viscosity of the ink composition is increased. Continuous discharge performance decreases.
  • the reactive oligomers (A) and (B) having the above-described elongation and weight average molecular weight are used in combination.
  • one of the reactive oligomers (A) and (B) has 2 or less ethylenic double bonds in one molecule, and the other has 2 or less ethylenic double bonds in one molecule.
  • the oligomer is less reactive than the monomer, but one of the reactive oligomers (A) and (B) has two or more ethylenic double bonds in one molecule, and the other has 2 ethylenic double bonds.
  • the reactive oligomers (A) and (B), or these reactive oligomers and the monofunctional monomer polymerize smoothly, so that the ink has excellent curability even with low energy irradiation.
  • a composition can be obtained and solvent resistance can be improved. Since the ink composition of the present invention contains a monofunctional monomer having few reactive points for reducing the viscosity, the number of ethylenic double bonds in one molecule, that is, only a monofunctional oligomer is used as an oligomer. When used, the reactivity decreases, and the curability and adhesion tend to decrease when irradiated with low energy.
  • Reactive monofunctional oligomer having one bond iii)
  • one of the reactive oligomers (A) and (B) has a high content of ethylenic double bonds, while the other Since the content of the ethylenic double bond is small, sufficient curability can be secured even by low energy irradiation, and the characteristics of the reactive oligomer having a high elongation rate are not impaired.
  • the combination (ii) or (iii) is preferable, the combination (iii) is more preferable, and the ethylenic double in one molecule.
  • a combination of reactive bifunctional oligomers having two bonds is more preferred.
  • the reactivity increases as the number of ethylenic double bonds in the reactive polyfunctional oligomer having two or more ethylenic double bonds in one molecule increases.
  • the viscosity becomes higher as the number of functional groups increases, and the printed film becomes hard, so the number is preferably 4 or less, more preferably 3 or less.
  • a reactive monofunctional oligomer is a reactive oligomer having one ethylenic double bond in one molecule
  • a reactive bifunctional oligomer is an ethylenic double bond in one molecule.
  • the reactive oligomer having two, the reactive higher polyfunctional oligomer means each reactive oligomer having three or more ethylenic double bonds in one molecule, and the reactive polyfunctional oligomer is reactive 2 It means a reactive oligomer having two or more ethylenic double bonds in one molecule generically called a functional oligomer and a reactive higher polyfunctional oligomer.
  • the reactive oligomer (A) is 5% by mass to 35% by mass and the reactive oligomer (B) is 5% by mass to 35% by mass with respect to the total mass of the composition. And a total of 10 to 40% by mass of reactive oligomers (A) and (B).
  • the content of any of the reactive oligomers (A) and (B) is less than 5% by mass, curability is lowered.
  • the balance of a polymeric compound will collapse
  • the curability and the adhesiveness are lowered. If the total content of the reactive oligomers (A) and (B) is more than 40% by mass, the content of the monofunctional monomer that can be added decreases, and the viscosity tends to increase even when a low molecular weight reactive oligomer is used. At the same time, the curability tends to decrease.
  • the reactive oligomers (A) and (B) are preferably aliphatic oligomers.
  • An aliphatic oligomer has a larger elongation due to its molecular structure than an aromatic oligomer, and can form a printing film excellent in stretchability.
  • Examples of reactive oligomers (A) and (B) include urethane acrylate oligomers, polyester acrylate oligomers, epoxy acrylate oligomers, and the like.
  • Examples of reactive oligomers (A) available on the market include EBECRYL 3708, EBECRYL 210, EBECRYL 270, EBECRYL 284, EBECRYL 264, EBECRYL 265, EBECRYL 8402, EBECRYL 8804, EBECRYL 8807, and EBECRYL 3708 EBECRYL-745, KRM-8098, KRM-7735, KRM-8296, Sartomer CN-131B, CN-929, and the like.
  • Examples of the reactive oligomer (B) available on the market include EBECRYL® 230 manufactured by Daicel Cytec; CN®966J75, CN®964, CN®980 manufactured by Sartomer, KAYARAD®UX-2201 manufactured by Nippon Kayaku Co., Ltd. KAYARAD UX-2301, KAYARAD UX-3204, KAYARAD UX-3301, KAYARAD UX-4101, KAYARAD UX-6101, KAYARAD UX-7101, KAYARAD UX-0937, Actilane 170, Actilane 200, Actilane 300, Actilane 310 from Acros Etc. These may be used alone or as a mixture of two or more.
  • the ink composition of the present invention has two or more ethylenic double bonds as long as it contains a monofunctional monomer, a reactive oligomer (A), and a reactive oligomer (B) in a content within the above range.
  • a polyfunctional monomer may further be contained. If a small amount of a polyfunctional monomer having many reactive points is contained, an ink composition having excellent curability and adhesion can be obtained without reducing stretchability. However, since the printing film becomes hard due to the addition of the polyfunctional monomer and the stretchability is lowered, when the polyfunctional monomer is used, its content is preferably 5% by mass or less.
  • polyfunctional monomers examples include hydroxypivalate neopentyl glycol di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, trimethylolpropane (meth) acrylic acid benzoate, diethylene glycol di (meth) ) Acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, polyethylene glycol (200) di (meth) acrylate, polyethylene glycol (400) di (meth) acrylate, polyethylene glycol (600) di ( (Meth) acrylate, polyethylene glycol (1000) di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate Polypropylene glycol (400) di (meth) acrylate, polypropylene glycol (700) di (meth) acrylate, neopentyl glycol di (meth) acrylate
  • the ink composition of the present invention is at least one selected from the group consisting of an acylphosphine oxide-based initiator (C) and an ⁇ -aminoalkylphenone-based initiator (D) in order to initiate polymerization by low energy irradiation means.
  • C acylphosphine oxide-based initiator
  • D ⁇ -aminoalkylphenone-based initiator
  • the ⁇ -aminoalkylphenone initiator (D) When the ⁇ -aminoalkylphenone initiator (D) is used, it is preferable to use the ⁇ -aminoalkylphenone initiator (D) and the thioxanthone initiator (E) in combination. If it is a mixed initiator in which the ⁇ -aminoalkylphenone initiator (D) and the thioxanthone initiator (E) are used in combination, the curability and adhesion can be further improved.
  • acylphosphine oxide-based initiator (C) examples include 2,4,6-limethylbenzoyldiphenylphosphine oxide, 2,6-dimethoxybenzoyldiphenylphosphine oxide, 2,6-dichlorobenzoyldiphenylphosphine oxide, 2,3 , 5,6-tetramethylbenzoyldiphenylphosphine oxide, 2,6-dimethylbenzoyldiphenylphosphine oxide, 4-methylbenzoyldiphenylphosphine oxide, 4-ethylbenzoyldiphenylphosphine oxide, 4-isopropylbenzoyldiphenylphosphine oxide, 1-methylcyclohexane Sanoylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2 4,6-trimethylbenzoylphenylphosphinic acid methyl ester,
  • Examples of the ⁇ -aminoalkylphenone initiator (D) include 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1,2-methyl-1- [4- (methoxythio) -phenyl] -2-morpholinopropan-2-one and the like are included. These may be used alone or as a mixture of two or more. Examples of the ⁇ -aminoalkylphenone initiator (D) available on the market include IRGACURE 369 and IRGACURE 907 manufactured by Ciba.
  • Examples of the thioxanthone initiator (E) include thioxanthone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4- Diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone and the like are included. These may be used alone or as a mixture of two or more. Examples of commercially available thioxanthone initiators (E) include KAYACURE® DETX-S manufactured by Nippon Kayaku Co., Ltd. and Chivacure® ITX manufactured by Double Bond Chemical.
  • the contents of the acylphosphine oxide initiator (C), ⁇ -aminoalkylphenone initiator (D), and thioxanthone initiator (E) in the ink composition depend on the content of the polymerizable compound.
  • the total amount is usually 5% by mass or more and 15% by mass or less with respect to the total mass of the composition.
  • these contents are less than 5% by mass, the curability and the adhesion are likely to be lowered by irradiation with low energy.
  • these contents exceed 15% by mass unreacted components remain and the print quality tends to be impaired.
  • the ⁇ -aminoalkylphenone initiator (D) is contained in an amount of 40 to 99% by mass and the thioxanthone initiator (E) in an amount of 1% by mass to 60% by mass in the total amount of the photopolymerization initiator.
  • the photopolymerization initiator containing the ⁇ -aminoalkylphenone initiator (D) and the thioxanthone initiator (E) in the above range an ink composition having further excellent curability and adhesion can be obtained. Can do.
  • photopolymerization initiator a conventionally known initiator may be further contained in addition to the above initiator.
  • photopolymerization initiators include arylalkyl ketone initiators, oxime ketone initiators, acyl phosphonate initiators, thiobenzoic acid S-phenyl initiators, titanocene initiators, aromatic ketone initiators.
  • Agents, benzyl initiators, quinone derivative initiators, ketocoumarin initiators, and the like are preferable with respect to the total mass of a composition.
  • the ink composition of the present invention contains a surface tension adjusting agent.
  • Suitable surface tension modifiers include silicone compounds having a polydimethylsiloxane structure. If such a silicone compound is used as the surface tension adjusting agent, the liquid physical properties such as the surface tension of the ink composition can be adjusted to a range suitable for the ink jet system. Of the silicone compounds, silicone compounds having an ethylenic double bond in the molecule are preferred. Adhesion can be further improved by using a polymerizable compound and a silicone compound having an ethylenic double bond in the molecule.
  • silicone compounds include BYK-300, BYK-302, BYK-306, BYK-307, BYK-310, BYK-315, BYK-320, BYK-322, BYK-323, BYK- 325, BYK-330, BYK-331, BYK-333, BYK-337, BYK-344, BYK-370, BYK-375, BYK-377, BYK-UV3500, BYK-UV 3510, BYK-UV 3570, Degussa TEGO-Rad 2100, TEGO-Rad 2200N, TEGO-Rad 2250, TEGO-Rad 2300, TEGO-Rad 2500, TEGO-Rad 2600, TEGO-Rad 2700, Granol 100, Granol 115, Granol 400 made by Kyoeisha Chemical Co., Ltd.
  • Granol® 410 Granol® 435, Granol® 440, Granol® 450, B-1484, Polyflow ATF-2, KL-600, UCR-L® 72, UCR-L® 93, and the like. These may be used alone or as a mixture of two or more.
  • the content of the surface tension adjusting agent in the ink composition is preferably 2.5% by mass or less, more preferably 0.02% by mass or more and 2.5% by mass or less, with respect to the total mass of the composition. .
  • an undissolved substance may arise or foaming may be caused.
  • the ink composition may contain a conventionally known surface tension adjusting agent in addition to the silicone compound.
  • a surface tension adjusting agent examples include Emulgen manufactured by Kao Corporation.
  • the ink composition may use various conventionally known dyes as a coloring material, but it is preferable to use either or both of an inorganic pigment and an organic pigment from the viewpoint of weather resistance.
  • inorganic pigments include titanium oxide, zinc oxide, zinc oxide, tripone, iron oxide, aluminum oxide, silicon dioxide, kaolinite, montmorillonite, talc, barium sulfate, calcium carbonate, silica, alumina, cadmium red, red rose, molybdenum Red, chrome vermilion, molybdate orange, yellow lead, chrome yellow, cadmium yellow, yellow iron oxide, titanium yellow, chrome oxide, pyridian, cobalt green, titanium cobalt green, cobalt chrome green, ultramarine blue, ultramarine blue, bitumen, Cobalt blue, cerulean blue, manganese violet, cobalt violet, mica and the like are included.
  • organic pigments examples include azo, azomethine, polyazo, phthalocyanine, quinacridone, anthraquinone, indigo, thioindigo, quinophthalone, benzimidazolone, and isoindoline organic pigments.
  • Carbon black made of acidic, neutral or basic carbon may be used.
  • a hollow particle of a crosslinked acrylic resin or the like may be used as the organic pigment.
  • pigments having a cyan color examples include C.I. I. Pigment blue 1, C.I. I. Pigment blue 2, C.I. I. Pigment blue 3, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 16, C.I. I. Pigment blue 22, C.I. I. Pigment Blue 60 and the like are included.
  • C.I. I. Pigment blue 15: 3 C.I. I. Either or both of Pigment Blue 15: 4 are preferred.
  • pigments having a magenta color examples include C.I. I. Pigment red 5, C.I. I. Pigment red 7, C.I. I. Pigment red 12, C.I. I. Pigment red 48 (Ca), C.I. I. Pigment red 48 (Mn), C.I. I. Pigment red 57 (Ca), C.I. I. Pigment red 57: 1, C.I. I. Pigment red 112, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 168, C.I. I. Pigment red 184, C.I. I. Pigment red 202, C.I. I. Pigment red 209, C.I. I.
  • Pigment red 254, C.I. I. Pigment Violet 19 and the like are included.
  • pigments having a yellow color examples include C.I. I. Pigment yellow 1, C.I. I. Pigment yellow 2, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14C, C.I. I. Pigment yellow 16, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 75, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 97, C.I. I. Pigment yellow 98, C.I. I.
  • Pigment yellow 109 C.I. I. Pigment yellow 110, C.I. I. Pigment yellow 114, C.I. I. Pigment yellow 120, C.I. I. Pigment yellow 128, C.I. I. Pigment yellow 129, C.I. I. Pigment yellow 130, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 147, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 151, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 180, C.I. I. Pigment yellow 185, C.I. I.
  • Pigment yellow 213, C.I. I. Pigment Yellow 214 and the like are included.
  • Examples of pigments having a black color include HCF, MCF, RCF, LFF, SCF manufactured by Mitsubishi Chemical Corporation; Monarch, Regal manufactured by Cabot; Color Black, Special Black, Printex manufactured by Degussa Huls; Tokai Carbon Talker Black manufactured by Co .; Raven manufactured by Columbia Co., etc. are included.
  • the content of the coloring material in the ink composition is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 7% by mass or less, and more preferably 3% by mass or more with respect to the total mass of the composition. 6 mass% or less is most preferable.
  • the content of the coloring material is too small, the coloring power of the image tends to be reduced.
  • the content of the colorant is too large, the viscosity of the ink composition increases, and the fluidity tends to be impaired.
  • a pigment derivative or a pigment dispersant may be further used to improve the dispersibility of the pigment.
  • the pigment derivative include a pigment derivative having a dialkylaminoalkyl group, a pigment derivative having a dialkylaminoalkylsulfonic acid amide group, and the like.
  • the pigment dispersant include ionic or nonionic surfactants and anionic, cationic or nonionic polymer compounds. Among these, a polymer compound containing a cationic group or an anionic group is preferable from the viewpoint of dispersion stability.
  • pigment dispersants examples include SOLSPERS manufactured by Lubrizol, DISPERBYK manufactured by BYK Chemie, EFKA manufactured by Fuka Additives, and the like.
  • the content of the pigment derivative and the pigment dispersant in the ink composition is preferably 0.05% by mass or more and 5% by mass or less with respect to the total mass of the composition.
  • the ink composition of the present invention preferably further contains a hindered amine compound having a 2,2,6,6-tetramethylpiperidinyl group. If the hindered amine compound is contained together with the monofunctional monomer, the reactive oligomers (A) and (B), and the photopolymerization initiator, the ink has excellent storage stability without reducing the curability of the ink composition. A composition can be obtained.
  • hindered amine compounds include bis (1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis (2,2,6,6-tetramethyl-1) decanedioate. -(Octyloxy) -4-piperidinyl) ester and the like are included.
  • the content of the hindered amine compound in the ink composition is preferably 0.01% by mass or more and 3% by mass or less, more preferably 0.2% by mass or more and 2% by mass or less with respect to the total mass of the composition. It is.
  • the content of the hindered amine compound is less than 0.01% by mass, radicals generated during storage cannot be sufficiently captured, and storage stability tends to decrease.
  • the content of the hindered amine compound is more than 3% by mass, the effect of scavenging radicals is saturated and the polymerization reaction during energy beam irradiation tends to be inhibited.
  • the ink composition may further contain other hindered amine compounds, phenolic antioxidants, phosphorus antioxidants, hydroquinone monoalkyl ethers and the like as gelling agents.
  • examples of such anti-gelling agents include hydroquinone monomethyl ether, hydroquinone, t-butylcatechol, pyrogallol, TINUVIN 111 FDL, TINUVIN 144, TINUVIN 292, TINUVIN XP40, TINUVIN XP60, TINUVIN 400, etc. It is done.
  • the content of these anti-gelling agents in the ink composition is preferably 0.1% by mass or more and 4% by mass or less in total with respect to the total mass of the composition.
  • a surfactant In the ink composition of the present invention, a surfactant, a leveling agent, an antifoaming agent, an antioxidant, a pH adjusting agent, a charge imparting agent, a bactericidal agent, an antiseptic agent, a deodorizing agent, a charge adjusting agent, and a wet agent are further necessary.
  • Known general additives such as agents, anti-skinning agents, and fragrances may be blended as optional components.
  • the ink composition As a method for preparing the ink composition, conventionally known methods can be used. However, when a pigment is used as the colorant, the following preparation method is preferable.
  • a mixture is prepared by premixing a colorant, a monofunctional monomer that is a polymerizable compound, a part of the reactive oligomers (A) and (B), and, if necessary, a pigment dispersant.
  • a primary dispersion examples include a disperser; a container drive medium mill such as a ball mill, a centrifugal mill, and a planetary ball mill; a high-speed rotating mill such as a sand mill; and a medium agitation mill such as a stirring tank mill.
  • the remaining polymerizable compound, the photopolymerization initiator, the surface tension adjuster, and other additives such as a hindered amine compound as necessary are added to the primary dispersion, and uniformly using a stirrer.
  • a stirrer for example, a three-one motor, a magnetic stirrer, a dispaper, a homogenizer, or the like can be used.
  • the ink composition may be mixed using a mixer such as a line mixer.
  • the ink composition may be mixed using a disperser such as a bead mill or a high-pressure jet mill for the purpose of further reducing the particles in the ink composition.
  • the dispersion average particle size of the pigment particles in the ink composition is preferably 20 to 200 nm, more preferably 50 to 160 nm. If the dispersion average particle diameter is less than 20 nm, the weather resistance of the printed matter tends to be reduced because the particles are fine. On the other hand, if the dispersion average particle diameter exceeds 200 nm, the fineness of the printed matter tends to decrease.
  • an ink composition having a low viscosity of 4 to 70 mPa ⁇ s at 25 ° C. is obtained. Can be prepared. Further, since it contains a polymerizable compound and a surface tension adjusting agent, an ink composition suitable for an ink jet system having a surface tension of 25 to 32 mN / m can be prepared. For this reason, the ink composition of the present invention does not easily cause a phenomenon such as nozzle missing, and is excellent in continuous discharge properties.
  • the ink composition of the present invention does not need to contain a diluting solvent.
  • the diluting solvent is inevitably mixed in the ink composition. May come.
  • the amount of such a diluting solvent inevitably mixed is usually 3% by mass or less based on the entire ink composition.
  • the ink composition of the present invention does not need to be diluted with a diluting solvent, has a low viscosity even without heating, and has good pigment dispersibility when the colorant is a pigment. It has good dispersion stability that does not cause problems such as viscosity increase during use or pigment settling. For this reason, in the ink jet system, stable ejection can be obtained at room temperature without heating the ink.
  • a marking film such as a car wrapping film
  • an ink composition is printed in a predetermined pattern by an inkjet method on one side of a base material made of a polymer resin such as vinyl chloride resin, polyethylene terephthalate, polycarbonate
  • a marking film can be produced by laminating an adhesive layer and a release sheet on the other side of the substrate.
  • a three-dimensional stereoscopic display member for three-dimensionally forming a printed material similarly, for example, after printing an ink composition in a predetermined pattern on one surface side of a polymer substrate by an ink jet method, the printed material is formed in a desired shape.
  • a three-dimensional display member can be produced by three-dimensional molding.
  • the inkjet method is not particularly limited, but is a charge control method that discharges ink using electrostatic attraction, a drop-on-demand method (pressure pulse method) that uses the vibration pressure of a piezo element, and an electrical signal is changed to an acoustic beam.
  • a charge control method that discharges ink using electrostatic attraction
  • a drop-on-demand method that uses the vibration pressure of a piezo element
  • an electrical signal is changed to an acoustic beam.
  • an acoustic ink jet method using a radiation pressure applied to the ink a thermal ink jet method using the pressure generated by heating the ink to form bubbles and the like can be employed.
  • Inkjet methods include a method of ejecting a large number of low-density inks called photo inks in a minute volume, a method of improving image quality using a plurality of inks having substantially the same hue and different concentrations, and colorless and transparent inks. The method used is included.
  • an ultraviolet LED, an ultraviolet laser, or the like can be used in addition to the mercury lamp and the metal halide lamp.
  • the ink composition of the present invention is effective because ultraviolet rays, LEDs, and ultraviolet lasers have low energy and require high curing sensitivity.
  • low energy of 500 mJ / cm 2 or less can be used as the cumulative amount of ultraviolet light.
  • the energy rays are preferably applied to the ink composition after 1 to 1,000 ms have elapsed after the ink composition has been ejected onto the substrate.
  • the elapsed time is less than 1 ms, the distance between the head and the light source is too short, and the head may be irradiated with energy rays, leading to an unexpected situation.
  • the elapsed time exceeds 1,000 ms, the image quality tends to deteriorate due to ink bleeding in the case of multicolor printing.
  • part means “part by mass”.
  • the ink components used in the examples and comparative examples are shown in Table 1 below.
  • the display of each component in the ink compositions in Tables 2 to 5 is in accordance with the display in parentheses in the type column in Table 1.
  • “MA-8” in Tables 2 to 5 means “carbon black pigment (MA-8)” in Table 1.
  • the elongation percentage and the weight average molecular weight of the oligomer alone were measured as follows.
  • the coating film was irradiated with ultraviolet rays (integrated light quantity 1,000 mJ / cm 2 ) using a metal halide lamp to form a polymer.
  • the obtained polymer was peeled from the glass substrate and cut into a size of 50 mm length ⁇ 10 mm width to prepare a measurement sample.
  • this measurement sample was stretched at 25 ° C. with a tensile tester (manufactured by Shimadzu Corp., Autograph AGS-H 100N) at a pulling rate of 1 mm / s, the elongation at break was determined as the elongation of the polymer of the oligomer alone. Rate.
  • Weight average molecular weight of oligomer The weight average molecular weight (polystyrene conversion) of the oligomer simple substance was measured by gel permeation chromatography (GPC) (solvent: tetrahydrofuran).
  • the viscosity was measured using an R100 viscometer (manufactured by Toki Sangyo Co., Ltd.) under the conditions of 25 ° C. and cone rotation speed of 20 rpm.
  • the dispersion average particle size of the pigment particles was measured using a particle size distribution measuring device FPER-1000 (manufactured by Otsuka Electronics Co., Ltd.).
  • the ink jet recording apparatus includes an ink tank, a supply pipe, a front chamber ink tank immediately before the head, and a piezo head as an ink supply system. Further, the ink jet recording apparatus was driven at a driving frequency of 28 KHz so that the ink could be ejected with a droplet size of about 6 pl and a resolution of 1200 ⁇ 1200 dpi.
  • ⁇ No discharge failure occurs.
  • ⁇ No nozzle chipping occurs but satellites are generated.
  • the ink was printed with a bar coater to form a print film having a thickness of 3 ⁇ m (bar coater: # 6).
  • the printed film was irradiated with ultraviolet rays so that the total irradiation light amount was 300 mJ / cm 2 using an ultraviolet LED (NCCU001E manufactured by Nichia Corporation) as an irradiation means, and the ink was cured.
  • the printed film thus cured was touched with a finger, and the presence or absence of ink adhering to the finger was visually examined and evaluated according to the following criteria.
  • ⁇ Ink does not adhere to the finger
  • ⁇ Ink does not adhere to the finger, but the printed film surface is scratched
  • ⁇ Ink adheres to the finger
  • the number of peels in 100 pieces was examined and evaluated according to the following criteria. ⁇ : The number of peels in the cross cut test is 10 or less ⁇ : The number of peels in the cross cut test is 11 to 20 ⁇ : The number of peels in the cross cut test is 21 or more
  • a position of 10 mm from one end in the long side direction of the measurement sample produced as described above is fixed to the sample stage, and the position 10 mm from the other end is pulled by hand at a speed of 1 cm / s, and the ink film is cracked.
  • the stretch length until peeling occurred was measured, and the stretchability was evaluated according to the following criteria.
  • the measurement environment temperature was room temperature.
  • ⁇ Cracking and peeling do not occur in the ink film even if the measurement sample is stretched 150% or more.
  • ⁇ Cracking or peeling occurs in the ink film while the measurement sample is stretched 130% to 150%.
  • the ink film cracks and peels while the film is stretched 120% to 130%
  • the inks of the examples according to the present invention have a viscosity of 29.5 to 65.8 mPa ⁇ s and a surface tension of 29.7 to 30.4 mN / m. It can be seen that it has a low viscosity and a surface tension suitable for the ink jet system. For this reason, the ink of an Example is excellent in continuous discharge property. Moreover, even if it hardens using the low energy ultraviolet LED, it turns out that the ink of an Example is excellent in sclerosis
  • the inks of the examples have excellent stretchability, and even when the ink film is stretched 130% or more after curing, an ink film with little cracking or peeling can be formed. Furthermore, it can be seen that the inks of the examples containing hindered amine compounds having 2,2,6,6-tetramethylpiperidinyl groups as anti-gelling agents have excellent storage stability.
  • the ink containing only one of the reactive oligomers (A) and (B) as the oligomer is inferior in stretchability and solvent resistance. For this reason, such an ink is unsuitable for the use of a marking film.
  • an ink having too little or too much content is highly viscous, or has poor stretchability and solvent resistance.
  • sclerosis hardenability becomes inadequate when only a monofunctional oligomer is used as an oligomer.
  • the ink not containing the surface tension adjusting agent increases the surface tension and decreases the storage stability, making the ink unsuitable for the ink jet system.
  • the ink films formed using the inks of Comparative Examples 5 and 6 were insufficient in curability, and thus the adhesion and stretchability could not be evaluated.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
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Abstract

La présente invention concerne une composition d'encre à jet d'encre à durcissement par faisceau électronique comprenant un composé polymère contenant un monomère monofonctionnel, un oligomère réactif (A) ayant un taux d'allongement de 130 % ou plus et une masse moléculaire moyenne en poids supérieure ou égale à 800 mais inférieure à 3000, et un oligomère réactif (B) ayant un taux d'allongement de 130 % ou plus et une masse moléculaire moyenne en poids comprise entre 3000 et 8000, dans laquelle un des oligomères réactifs (A) et (B) possède au plus deux groupes fonctionnels et l'autre possède au moins deux groupes fonctionnels ; au moins un initiateur de photopolymérisation choisi dans le groupe constitué des initiateurs de type oxyde d'acylphosphine (C) et des initiateurs de type α-aminoalkylphénone (D) ; un régulateur de tension de surface ; et une matière colorante.
PCT/JP2009/069627 2008-11-21 2009-11-19 Composition d'encre à jet d'encre à durcissement par faisceau énergétique Ceased WO2010058816A1 (fr)

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US13/130,388 US20110230582A1 (en) 2008-11-21 2009-11-19 Energy beam-curing inkjet ink composition
JP2010539249A JP5583595B2 (ja) 2008-11-21 2009-11-19 エネルギー線硬化型インクジェットインク組成物
EP09827597.7A EP2351799B1 (fr) 2008-11-21 2009-11-19 Composition d'encre à jet d'encre à durcissement par faisceau énergétique

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JP7676107B2 (ja) 2019-11-19 2025-05-14 スリーエム イノベイティブ プロパティズ カンパニー 放射線硬化型インクジェットインク、装飾シート及び装飾シートの製造方法

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EP2351799A4 (fr) 2012-04-25
US20110230582A1 (en) 2011-09-22

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