JP2011111522A - Ultraviolet-curable ink composition for ink-jet printing use - Google Patents

Abstract

The present invention provides an ultraviolet curable ink composition for ink jet recording which has excellent ejection stability and excellent printed film performance such as abrasion resistance and scratch resistance of printed matter.
An ultraviolet curable ink composition for ink jet recording, comprising an ultraviolet curable compound, a photopolymerization initiator, and methylphenyl silicone oil. More preferably, the ultraviolet curable ink composition for ink jet recording, comprising a polyether-modified silicone oil having an HLB of 10 or more.
[Selection figure] None

Description

  The present invention relates to an ultraviolet curable ink composition for ink jet recording, and more specifically, it has both excellent ejection stability and print film performance such as excellent abrasion resistance and scratch resistance of printed matter. The present invention relates to an ultraviolet curable ink composition for inkjet recording.

  Printing by an ink jet printer recording apparatus is a method in which ink is ejected from a nozzle and adhered to a recording material, and since the nozzle and the recording material are in a non-contact state, the surface has a curved surface or irregular irregular shape. In contrast, good printing can be performed. For this reason, the printing method is expected to be used in a wide range of industrial applications.

  As such ink for ink jet recording, there are generally an aqueous dye ink using water as a main solvent and a non-aqueous (oil-based) dye ink using an organic solvent as a main solvent. However, problems when using conventional water-based dye inks in industrial applications include drying speed after forming a printed film on non-absorbing materials, adhesion of the printed film, and further wear resistance, water resistance, light resistance, etc. It is mentioned that the durability of is insufficient. On the other hand, since the oil-based dye ink uses a chromium complex dye containing a heavy metal such as chromium, there is a problem in terms of safety. Accordingly, water-based pigments and oil-based pigment inks using pigments as colorants have been proposed as inks that have improved the problems associated with these colorants. In recent years, many water-based and oil-based ultraviolet curable pigment inks have been proposed for industrial applications, in which a printed film is further cured and dried with an active energy ray such as ultraviolet rays to increase the film strength.

  Of these inks that are cured and dried with active energy rays, UV-curable water-based pigment inks provide sufficient print film adhesion to non-absorbing or ink-absorbing recording media. I have a problem that I can't. A method of providing an ink receiving layer to impart adhesiveness has also been studied, but has a problem in practical use such that the process becomes bulky. For this reason, it is considered to be advantageous to use an ultraviolet curable oily pigment ink that can directly print on the non-absorbable recording medium surface and has excellent durability and adhesion of the cured film. Furthermore, in order to improve the adhesiveness, abrasion resistance, water resistance, etc. of the printed film, an oil-based ultraviolet curable ink that does not substantially contain a non-polymerizable solvent such as an organic solvent for dilution or dissolution is used. Is more advantageous. For this reason, a pigment-based UV curable ink jet that does not contain a non-polymerizable organic solvent is used for an ink having excellent durability such as curability, durability, and storage stability of a printed film while maintaining ejection stability during ink jet recording. Attempts have been made to produce with a recording ink composition, and realization thereof is desired.

There are the following three general required characteristics related to the ejection stability of ink for inkjet recording in which ink is ejected from the ejection orifice (fine hole) at the tip of the nozzle to form a printed image.
(1) Low viscosity and small change in viscosity due to drying of ink at the discharge port.
(2) Formation and particle formation (ink cutting) of ink droplets at the ejection port are performed smoothly.
(3) The ejection direction stability is good.

  In order to achieve smooth particle formation at the discharge port of the ink composition for ink jet recording or good stability in the discharge direction, it is important that the ink repels the surface of the nozzle orifice plate. The orifice plate surface is generally subjected to a liquid repellent treatment with a fluorine-based material or the like. However, the surface tension of the ink composition itself greatly affects the repellency of the ink composition with respect to the liquid repellent surface after the ink composition has been in contact with the liquid repellent surface of the nozzle orifice plate for a long time. For this reason, adjusting to an appropriate value so as not to excessively reduce the surface tension of the ink composition is important for designing an ink having excellent ejection stability.

  On the other hand, it is also important to improve the print quality of printed matter, such as the adhesion of the printed film to the printing material, the durability of the printed film such as the abrasion resistance and scratch resistance of the printed film, and so on. An ink containing a silicone-based or fluorine-based surfactant has been proposed for the purpose of imparting wettability to the landing ink composition, printing film performance such as abrasion resistance and scratch resistance of the printed film. ing. Specifically, it is cured by ultraviolet irradiation typified by organically modified silicon acrylate for the purpose of adjusting the surface tension, improving the abrasion resistance and adhesion of the cured film, and imparting wettability to polyolefin substrates such as polypropylene. An ultraviolet curable ink composition containing a silicone derivative has been proposed (see Patent Document 1, Patent Document 2, and Patent Document 3). Further, an ink containing an ethylenically unsaturated compound containing fluorine and / or silicon atoms and N-vinyl lactams, which is excellent in adhesion and blocking resistance of a cured film, has been proposed (see Patent Document 4). Furthermore, silicone surfactants represented by polyether-modified silicone oils having a specific range of HLB values have been proposed for the purpose of imparting wettability to a printing substrate (see Patent Document 5).

  However, the addition of silicone derivatives that are cured by ultraviolet irradiation, such as organically modified silicon acrylate, and the addition of surfactants such as silicones and fluorines, give wettability to the ink that has landed on the surface of the printing material, printing Although effective for imparting abrasion resistance and scratch resistance to the coating, ink with reduced ink surface tension due to the addition has long-lasting contact with the liquid-repellent treated nozzle plate, resulting in reduced repelling to the nozzle plate. The discharge stability tends to be insufficient. On the other hand, by adjusting the surface tension of the ink by selecting the surfactant type and adjusting the addition amount, even if it makes long-term contact with the liquid-repellent treated nozzle plate, it has good repellency to the nozzle plate. Although the ink can be maintained and discharge stability is excellent, the abrasion resistance and scratch resistance of the printed film tend to be insufficient. As described above, it is difficult to realize an ultraviolet curable ink composition for ink jet recording excellent in both the ejection stability of the ink and the print film performance such as the abrasion resistance and scratch resistance of the print film. At present, no ultraviolet curable ink for ink jet recording having both characteristics has been obtained.

JP 2001-525479 A JP 2005-263848 A JP 2006-8998 A JP 2008-74556 A JP 2004-182933 A

  An object of the present invention relates to an ultraviolet curable ink composition for inkjet recording, which has excellent ejection stability and excellent printed film durability such as abrasion resistance and scratch resistance.

  The inventors of the present invention have a small decrease in surface tension due to the addition, smooth formation of droplets at the time of ink ejection, excellent ejection stability, and imparting abrasion resistance and scratch resistance of the printed film. As a result of diligent investigation of many silicone compounds and other additives that act as effective slip agents, the use of methylphenyl silicone oil reduces surface tension and provides excellent discharge stability and is an effective slip agent. As a result, it was found that the wear resistance and scratch resistance of the printed film can be improved, and the present invention has been achieved.

  That is, the present invention relates to an ultraviolet curable ink composition for ink jet recording, comprising an ultraviolet curable compound, a photopolymerization initiator, and methylphenyl silicone oil. As a more preferred embodiment, the present invention relates to an ultraviolet curable ink composition for inkjet recording, wherein a polyether-modified silicone oil having an HLB of 10 or more is used in combination. As the colorant to be used, a pigment is preferably used from the viewpoint of durability such as water resistance and light resistance. Further, as the ultraviolet curable compound, a radical polymerizable compound is preferably used, and an ultraviolet curable ink composition for ink jet recording having a surface tension at 25 ° C. in the range of 26 to 30 is preferable.

  The ultraviolet curable ink composition for ink jet recording of the present invention is excellent in both ejection stability and print film performance such as abrasion resistance and scratch resistance of printed matter, and is used in an ink jet recording method. It is suitable as.

Next, while showing embodiment of this invention, this invention is demonstrated still in detail.
The methylphenyl silicone oil used in the present invention is a silicone oil in which a part of dimethyl silicone oil is substituted with a phenyl group, and various products having different phenyl group contents are commercially available. The higher the phenyl group content, the better the solubility in (UV) curable compounds such as (meth) acrylate, and the lower the surface tension of the added ink, and the treatment with commonly used fluorine-based materials Although it has good repellent properties when contacted with the nozzle plate for a long time, it also has good compatibility with the UV curable composition. The effect of imparting slip properties to the coating is small. On the other hand, those having a small phenyl group content have a large effect of imparting slipping properties to the printed film, but have properties close to dimethyl silicone oil, such as (meth) acrylate used in the jet ink of the present invention. There exists a tendency for the solubility with respect to an ultraviolet curable compound to fall. In addition, the methylphenyl silicone oil used in the present invention is superior in wettability of the same ink in the formed ink film as compared to silicone surfactants such as polyether-modified silicone oil, and has characteristics for overcoating. Has the advantage of being excellent.

  The addition of methylphenyl silicone oil makes it possible to produce an ultraviolet curable ink jet recording ink composition that has both ejection stability, print film abrasion resistance, and scratch resistance. Since the properties of methylphenyl silicone oil differ depending on the content, the type and amount of methylphenyl silicone oil used for the UV curable compound such as (meth) acrylate used in the ink and the liquid repellent used in the nozzle plate Is more preferable. About the addition amount of methylphenyl silicone oil, it is preferable to add in the range of 0.1-2.0 mass% with respect to the ink whole quantity. By adding 0.1% by mass or more, it becomes easy to obtain sufficient abrasion resistance and scratch resistance to the printed film. By keeping the addition amount at 2.0% by mass or less, the surface tension can be reduced. Due to the decrease, sufficient repellent property to the nozzle plate liquid repellent treatment surface cannot be obtained, and it becomes easy to prevent the discharge stability from becoming insufficient.

  Specific examples of the methylphenyl silicone oil used in the present invention include KF-54 manufactured by Shin-Etsu Chemical Co., Ltd., TSF433, TSF4300 manufactured by Momentive Performance Materials, etc., but are not limited thereto. Absent.

In the present invention, it is preferable to use a polyether-modified silicone oil in combination with methylphenyl silicone oil. The polyether-modified silicone oil is obtained by introducing a polyether group into a part of the methyl group of dimethylpolysiloxane, and the polyether-modified silicone oil used in the present invention preferably has an HLB value of 10 or more. When the HLB value is less than 10, when the ink is used in combination with methylphenyl silicone oil, the surface tension of the ink is greatly reduced, and the ejection stability becomes insufficient. The addition amount of the polyether-modified silicone oil is preferably in the range of 0.05 to 1.0% by mass with respect to the total amount of ink. When the addition amount is 0.05% by mass or more, there is a tendency that sufficient abrasion resistance and scratch resistance can be imparted to the formed printed film, and by keeping the addition amount at 1.0% by mass or less. There is a tendency that the surface tension is lowered, and it is possible to easily prevent the ejection stability from being insufficient without obtaining sufficient repellent properties to the nozzle plate liquid repellent surface. HLB is a numerical expression of the hydrophilic / hydrophobic balance of oil, and is an abbreviation for valau of hydrophile and liophile balance. In this invention, HLB shall be calculated | required by the following Griffin method which takes the value of 0-20.
HLB value by Griffin method = 20 × sum of formula weight of hydrophilic part / molecular weight

  Specific examples of the polyether-modified silicone oil used in the present invention include KF-351A, KF355A, KF-640, KF-642, KF643, and KF-651A manufactured by Shin-Etsu Chemical Co., Ltd. It is not limited.

  Examples of the pigment used in the ultraviolet curable ink composition for inkjet recording of the present invention include inorganic pigments such as carbon black, titanium oxide and iron oxide, insoluble azo pigments, soluble azo pigments, phthalocyanine pigments, quinacridone pigments, perylene pigments, Organic pigments such as indoline pigments, benzimidazolone pigments, pyranthrone pigments, thioindigo pigments, and quinophthalone pigments are exemplified, but are not limited thereto. The content of these pigments in the ink is preferably in the range of 1 to 20% by mass of the total amount of the ink in order to obtain sufficient image density and light resistance of the printed image.

  The ultraviolet curable compound includes a radical polymerization type and a cationic polymerization type depending on the reaction mechanism. In order to obtain an ink having a fast curing and drying rate, it is preferable to use a radical polymerization type material having an ethylenic double bond such as (meth) acrylate as the ultraviolet curable compound.

  Specific examples of the compound having an ethylenic double bond used in the present invention include a monofunctional monomer having one ethylenic double bond and a polyfunctional monomer having two or more ethylenic double bonds. Two or more types can be used in combination. Further, it is preferable to contain a (meth) acrylate oligomer or a trifunctional or higher polyfunctional acrylate, but these have a high viscosity, and in particular, the (meth) acrylate oligomer has a higher viscosity than the monomer. It is preferable to use in the range of 2 to 20% by mass with respect to the total amount of compounds having a bond.

  Examples of the monofunctional monomer that can be used in the present invention include methyl, ethyl, propyl, butyl, amyl, 2-ethylhexyl, isooctyl, nonyl, dodecyl, hexadecyl, octadecyl, cyclohexyl, benzyl, methoxyethyl, butoxyethyl, phenoxyethyl, (Meth) acrylate, vinylcaprolactam, vinylpyrrolidone, N-vinyl having a substituent such as nonylphenoxyethyl, glycidyl, dimethylaminoethyl, diethylaminoethyl, isobornyl, dicyclopentanyl, dicyclopentenyl, dicyclopentenyloxyethyl And formamide. Two or more of these can be used in combination.

  Examples of the polyfunctional monomer include 1,3-butylene glycol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, neo Di (meth) acrylates such as pentyl glycol, 1,8-octanediol, 1,9-nonanediol, tricyclodecane dimethanol, ethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, Di (meth) acrylate of tris (2-hydroxyethyl) isocyanurate, di (meth) acrylate of diol obtained by adding 4 mol or more of ethylene oxide or propylene oxide to 1 mol of neopentyl glycol, bisphenol Di (meth) acrylate of diol obtained by adding 2 mol of ethylene oxide or propylene oxide to 1 mol of diol A, diol of triol obtained by adding 3 mol or more of ethylene oxide or propylene oxide to 1 mol of trimethylolpropane Or di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate obtained by adding 4 mol or more of ethylene oxide or propylene oxide to 1 mol of tri (meth) acrylate, bisphenol A , Dipentaerythritol poly (meth) acrylate, ethylene oxide-modified phosphoric acid (meth) acrylate, ethylene oxide-modified alkyl phosphoric acid (meth) acrylate, and the like. Two or more of these can be used in combination.

  Examples of the (meth) acrylate oligomer that can be used in the present invention include urethane (meth) acrylate oligomers, epoxy (meth) acrylate oligomers, polyester (meth) acrylate oligomers, and the like.

  As the photopolymerization initiator used in the present invention, benzoin isobutyl ether, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, benzyl, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 6-trimethylbenzoyldiphenylphosphine oxide, 2-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide and the like are preferred. In addition, molecular cleavage types other than these include 1-hydroxycyclohexyl phenyl ketone, benzoin ethyl ether, benzyl dimethyl ketal, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4 -Isop Pyrphenyl) -2-hydroxy-2-methylpropan-1-one and 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one, etc. may be used in combination, and hydrogen abstraction Benzophenone, 4-phenylbenzophenone, isophthalphenone, 4-benzoyl-4′-methyl-diphenyl sulfide, etc., which are type photopolymerization initiators, can also be used in combination.

  For the above photopolymerization initiator, for example, trimethylamine, methyldimethanolamine, triethanolamine, p-diethylaminoacetophenone, ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, N, N An amine that does not cause an addition reaction with the polymerizable component, such as dimethylbenzylamine and 4,4′-bis (diethylamino) benzophenone, can also be used in combination. Of course, it is preferable to select and use the photopolymerization initiator and the sensitizer that are excellent in solubility in the ultraviolet curable compound and do not inhibit the ultraviolet transmittance.

  In the ink composition for ink jet recording of the present invention, a polymerization inhibitor such as hydroquinone, methoquinone, di-t-butylhydroquinone, P-methoxyphenol, butylhydroxytoluene, nitrosamine salt or the like is used to increase the storage stability of the ink. You may add in 0.01-2 mass% in the inside.

  For the purpose of enhancing the dispersion stability of the pigment, it is preferable to use a polymer dispersant as the dispersant used in the ink composition for ink jet recording of the present invention. Specifically, Ajinomoto Fine Techno Co., Ltd. Ajisper PB821, PB822, PB817, Abyssia Corp. Solspers 24000GR, 32000, 33000, 39000, Enomoto Kasei Co., Ltd. Disparon DA-703-50, DA-705, DA-725 However, it is not limited to these. Further, the amount of the polymer dispersant used is preferably in the range of 10 to 80% by mass, particularly preferably in the range of 20 to 60% by mass with respect to the pigment. When the amount used is less than 10% by mass, the dispersion stability tends to be insufficient, and when it exceeds 80% by mass, the viscosity of the ink tends to increase, and the ejection stability tends to decrease.

  In addition, the ink composition of the present invention can be blended with non-reactive resins such as acrylic resin, epoxy resin, terpene phenol resin, rosin ester, etc. for the purpose of imparting adhesion to the substrate to be printed. .

  The production of the ink composition for ultraviolet curable ink jet recording of the present invention comprises a compound having an ethylenic double bond such as a pigment and (meth) acrylate, and a mixture containing a polymer dispersant and a resin as necessary. It can be prepared by dispersing the pigment using an ordinary disperser such as a bead mill, adding a photopolymerization initiator, and further adding an additive such as a surface tension adjuster, if necessary, and stirring and dissolving. A compound having an ethylenic double bond such as (meth) acrylate in which a photopolymerization initiator is dissolved after preparing a high-concentration pigment dispersion (mill base) using an ordinary dispersing machine such as a bead mill in advance. Can be prepared by stirring and mixing.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to the following Example at all. In addition, the part in an Example below represents a mass part.

(Adjustment of high concentration dispersion)
(Adjustment of high concentration magenta dispersion)
Fastgen Super Magenta RG 10 parts (Dainippon Ink Chemical Co., Ltd. quinacridone pigment CI Pigment Red 122)
Polymer dispersant “Sulspers 32000” 4.5 parts (polymer dispersant manufactured by Lubrizol)
85.5 parts of phenoxyethyl acrylate was stirred and mixed with a stirrer for 1 hour and then treated with a bead mill for 4 hours to prepare a high-concentration magenta dispersion.

(Adjustment of UV curable magenta ink)
4 parts of EBECRYL 8402 (urethane acrylic oligomer made by Daicel Cytec)
Miramar M240 8 parts (EO4 mol addition bisphenol A diacrylate made by MIWON)
Miramar M222 12 parts (dipropylene glycol diacrylate made by MIWON)
Isooctyl acrylate 14 parts N-vinylcaprolactam 14.5 parts Phenoxyethyl acrylate 2.5 parts Irgacure 819 4 parts (Ciba photopolymerization initiator)
Irgacure 2959 2 parts (Ciba photopolymerization initiator)
Darocur 1173 4 parts (Ciba photopolymerization initiator)
EPA 3 parts (Nippon Kayaku ethyl dimethylaminobenzoate)
Nonflex Alba 0.1 part (Seiko Chemical Di-t-butylhydroquinone)
To the above mixture, 45 parts of the high-concentration magenta dispersion was added to a solution in which the additives (Examples and Comparative Examples) shown in Table 1 were added and the photopolymerization initiator was heated and dissolved at 60 ° C. After mixing, the ink for a jet printer of each Example and Comparative Example was prepared by filtering with a 1.2 μm membrane filter. The characteristics of the prepared ultraviolet curable ink composition for inkjet recording and the characteristics of the printed film prepared using the ink composition were measured by the following measuring methods. The results are shown in Table 1 together with the types and amounts of additives added in each Example and Comparative Example.

[Surface tension measurement method]
It measured at 25 degreeC using the platinum plate with the Wilhelmy type surface tension meter (Kyowa Interface Chemical Co., Ltd. * CBVP-A3 type | mold). When the value of the surface tension by this measurement is in the range of 26 to 30 mN / m, the repelling property to the nozzle plate is sufficiently maintained, so that the ejection stability is not impaired and good printing tends to be performed. .

[Abrasion resistance evaluation method]
Ink was applied to a white PET sheet (trade name: Lumirror-250-E22 manufactured by Panac Co., Ltd.) with a spin coater so as to have a thickness of about 6 μm. / Cm) was irradiated with ultraviolet rays at an irradiation energy of 0.2 j / cm 2 to prepare a sample for wear resistance test, and the sample was rubbed using a non-woven fabric (trade name: Bencott, manufactured by Asahi Kasei). (Made by Co., Ltd.), a rubbing test was performed under a load of 500 g, 1000 g, and 1500 g, and the scratched state of the surface was visually evaluated according to the following three criteria.
○: No scratch is generated.
(Triangle | delta): It can visually recognize that it is slightly scratched.
X: A clear scar occurs.

Details of the additives shown in Tables 1 and 2 used in the ultraviolet curable ink jet recording ink compositions prepared in Examples and Comparative Examples are shown below.
KF54: Methyl phenyl silicone oil TSF433 manufactured by Shin-Etsu Chemical Co., Ltd .: Methyl phenyl silicone oil TSF 4300 manufactured by Momentive Performance Materials Co., Ltd. Methyl phenyl silicone oil KF 351A manufactured by Momentive Performance Materials Co., Ltd. Oil (HLB value: 12)
KF352A: polyether-modified silicone oil (HLB value: 7) manufactured by Shin-Etsu Chemical Co., Ltd.
KF615A: polyether-modified silicone oil (HLB value: 10) manufactured by Shin-Etsu Chemical Co., Ltd.
TR2200N (TEGO Rad2200N): Degussa polyether-modified silicone acrylate KF96-300cs: Shin-Etsu Chemical Co., Ltd. dimethyl silicone oil

  As described above, the inks of Examples 1 to 4 using methylphenyl silicone oil as an additive have a small decrease in surface tension due to the addition, and are excellent against the nozzle plate even when in contact with the liquid repellent nozzle plate for a long time. It is possible to maintain ink repellency and obtain an ink having excellent ejection stability. Moreover, the abrasion resistance of the cured film was also good. In addition, the ink of Example 5 combined with a polyether-modified silicone oil having an HLB value of 12 and the ink of Example 6 combined with a polyether-modified silicone oil having an HLB value of 10 are further less susceptible to surface tension reduction and repellent properties. It is considered that the discharge stability when the liquid-treated nozzle plate is contacted for a long time is further improved. Moreover, compared with the ink which used methylphenyl silicone oil independently, the abrasion resistance of the cured film was also favorable. In contrast, the ink of Comparative Example 2, which uses a polyether-modified silicone oil having an HLB value of 12 instead of methylphenyl silicone oil, has a small decrease in surface tension, but has poor wear resistance. Yes, the abrasion resistance of the ink of Comparative Example 3 using the polyether-modified silicone oil having an HLB value of 7 is good, but the drop in surface tension is large, and it is good when it comes into contact with a liquid-repellent treated nozzle plate for a long period of time. It is difficult to maintain the repellency and the ejection stability is lowered. Further, the ink of Comparative Example 4 in which the addition amount of the polyether-modified silicone oil having an HLB value of 7 was further reduced to reduce the decrease in the surface tension was able to suppress the decrease in the surface tension, but the wear resistance was poor. In addition, Comparative Example 5 ink using polyether-modified silicone acrylate instead of methylphenyl silicone oil as an additive has good wear resistance, but has a large decrease in surface tension, and the addition of polyether-modified silicone acrylate. The abrasion resistance of the ink of Comparative Example 6 in which the amount was further reduced was poor, and the decrease in surface tension could not be suppressed. Further, the ink of Comparative Example 7 using dimethyl silicone oil as an additive had poor solubility in the monomer, and the mixed liquid before adding the pigment dispersion became cloudy.

Claims (5)

An ultraviolet curable ink composition for inkjet recording, comprising an ultraviolet curable compound, a photopolymerization initiator, and methylphenyl silicone oil. 2. The ultraviolet curable ink composition for ink jet recording according to claim 1, further comprising a polyether-modified silicone oil having an HLB of 10 or more. 3. The ultraviolet curable ink composition for ink-jet recording according to claim 1 or 2, further comprising a pigment as a colorant. The ultraviolet curable ink composition for ink jet recording according to any one of claims 1 to 3, wherein the ultraviolet curable compound is a radical polymerizable compound. The ultraviolet curable ink composition for ink-jet recording according to any one of claims 1 to 4, wherein the surface tension at 25 ° C is in the range of 26 to 30 mN / m.