JP3185585B2 - Photocurable composition and photosensitive capsule - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocurable composition for forming an image and a photosensitive capsule used in an image forming apparatus or a printer.

[0002]

Conventionally, and an image forming method using the photosensitive capsules are studied, for example, JP-5 - 6
6559 JP, the 5 - 68871 discloses, the 5 - 29
No. 7552 discloses a microcapsule toner composed of a photosensitive capsule which is cured in response to light. Further, a photosensitive recording medium in which such a photosensitive capsule is previously supported on a film is prepared, and is used for image formation.

[0003] A photosensitive capsule is composed of an image-forming material such as a dye or a pigment, a polymerizable substance such as an acrylic monomer, and a photopolymerization initiator for initiating polymerization of the polymerizable substance. A mold composition is included. When performing image formation, exposure to a photosensitive capsule, after polymerizing and curing the photocurable composition contained in the capsule,
Only a photosensitive capsule having a weak strength is destroyed by pressurization or the like, and an image forming material such as a dye contained in the capsule is caused to flow out, and is transferred to an image receiving paper to form an image.

[0004]

However, in the photocurable compositions and photosensitive microcapsules disclosed in the above publications, when an image forming material such as a dye or a pigment is contained, the sensitivity is remarkably high. And the problem that sufficient sensitivity could not be obtained was caused.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to provide a photocuring device for image formation that does not increase the image processing time even when an image forming material such as a dye or pigment is contained. It is an object to provide a mold composition and a photosensitive capsule.

[0006]

In order to achieve the above object, the photocurable composition of the present invention comprises an image forming material such as a dye or a pigment, and an unsaturated group-containing polymerizable material which is cured by polymerization. A polymerization initiator for initiating the polymerization of the unsaturated group-containing polymerizable substance, and a ketocoumarin compound as a wavelength sensitizer for initiating the polymerization action of the polymerization initiator by absorbing the wavelength of light , The ketocoumarin
As the compound, “2H-1-benzopyran-3-propa
Neuic acid, 7- (diethylamino)-, beta, 2-
Dioxo, methyl ester "or"3,3'-carbo
Nylbis [7-butyl-10,10-dimethyl-7,
8,9,10-tetrahydro-2-oxo-2H-pyra
(2,3-f) quinoline] ”or“ 3,3′-cal
Bonyl bis @ 7- [N-ethyl-N-butoxyethyl)
Amino] coumarin} ” .

[0007] The polymerization initiator may be composed of a metal arene compound.

Further, the polymerization initiator may be composed of a triazine compound.

It is preferable that the polymerization initiator is composed of a mixture of a triazine compound and a metal arene compound.

[0010] More preferably, the metal arene compound is an iron arene compound.

Further, a photosensitive capsule can be prepared by using any one of the photocurable compositions described above as a core substance.

[0012]

In the photocurable composition and the photosensitive capsule of the present invention having the above-mentioned constitution, as a ketocoumarin compound which is a wavelength sensitizer, "2H-1-benzopyran-3- propane " is used.
Ropanoic acid, 7- (diethylamino)-, beta,
2-dioxo, methyl ethyl ester "or,"3,3'-mosquito
Rubonyl bis [7-butyl-10,10-dimethyl-
7,8,9,10-tetrahydro-2-oxo-2H-
Pyrano (2,3-f) quinoline] ”or“ 3,3′-
Carbonylbis {7- [N-ethyl-N-butoxyethyl
And at least one of them is excited by the absorption of light by using at least one of them , and at this time, electrons move to the polymerization initiator, and the polymerization of the unsaturated group-containing polymerizable substance is started to be cured. In the hardened portion, the image forming material such as a dye or a pigment does not flow out, and in the hardened portion, the image forming material is flown out to obtain a desired image.

When a metal arene compound is used as the polymerization initiator, electrons generated by excitation of the ketocoumarin compound as the wavelength sensitizer are easily transferred to the metal arene compound.

Further, when a triazine compound is used as the polymerization initiator, electrons generated from the ketocoumarin compound can be transferred to the triazine compound even in a region where the illuminance of light is low.

Further, when a substance obtained by mixing a metal arene compound and a triazine compound is used as the polymerization initiator,
It has high sensitivity because the occurrence rate of polymerization of the metal arene compound and the triazine compound, the ease of energy transfer with the ketocoumarin compound, and the reactivity with the unsaturated group-containing polymerizable substance are appropriately different.

Furthermore, if an iron arene compound is used as the metal arene compound, the sensitivity can be further improved.

Further, a photosensitive capsule is prepared using the photocurable composition as a core substance, and the photosensitive capsule is exposed. When the photosensitive capsule is exposed to light having the predetermined wavelength, the unsaturated group-containing polymerizable substance is exposed. Polymerized, cured, even when pressing the photosensitive capsule, the image forming material does not flow out, but when exposed to light other than the predetermined wavelength, because the unsaturated group-containing polymerizable material does not polymerize, When the photosensitive capsule is pressed, the image forming material flows out of the capsule and is transferred to an image receiving paper.

[0018]

EXAMPLES Examples of the photocurable composition embodying the present invention will be described below.

The photocurable composition of this embodiment comprises an image forming material such as a dye or a pigment, an unsaturated group-containing polymerizable substance, and a metal arene compound and a triazine-based compound as the unsaturated group-containing polymerizable substance. And a ketocoumarin compound as a wavelength sensitizer for initiating the polymerization action of the polymerization initiator by absorbing the wavelength of light.

The metal arene compound or triazine compound initiates the polymerization of the unsaturated group-containing polymerizable substance, and the metal arene compound is represented by the following chemical formula.

[0021]

Embedded image

In the above chemical formula, X is a group containing at least one benzene ring, and Y is BF ₄₋ , P
It is a basic ionic substance such as F ₆₋ , AsF ₆₋ and SbF ₆₋ and M is a metal such as iron, nickel and cobalt.

Preferred as metal arene compounds are
Iron arene compounds, chromium arene compounds, manganese arene compounds, cobalt arene compounds, nickel arene compounds and the like, when using an iron arene compound,
It is preferable because the sensitivity can be further improved.

On the other hand, the triazine compound is represented by the following chemical formula.

[0025]

Embedded image

In the above chemical formula, R is as shown in FIG. 1, (a) is 2,4,6-tris (trichloromethyl) -s-triazine, and (b) is 2- ( 4-
Chlorophenyl) -4,6-bis (trichloromethyl)
-S-triazine, (c) is 2-styryl-4,6-
Bis (trichloromethyl) -s-triazine, (d)
Is 2-phenyl-4,6-bis (trichloromethyl)
-S-triazine, (e) is 2- (4-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, (f) is 2- (3,4-dimethoxystyryl) -4 , 6-bis (trichloromethyl) -s-triazine, (g) is 2- (4-dimethylaminostyryl)
-4,6-bis (trichloromethyl) -s-triazine, (h) is 2- [4- (methylthio) phenyl]-
4,6-bis (trichloromethyl) -s-triazine,
(I) is 2- [4- (methylthio) styryl] -4,
6-bis (trichloromethyl) -s-triazine,
(J) is 2- (4-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, (k) is
2- (3,4,5-trimethoxystyryl) -4,6-
Bis (trichloromethyl) -s-triazine, (l)
Is 2- (3,4-dimethoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, (m) is
2- (4-methoxy-1-naphthyl) -4,6-bis (trichloromethyl) -s-triazine, (n) is 2
-(2-Methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine is shown.

The ketocoumarin compound has a polymerization reaction of 4
It is a wavelength sensitizer that shifts to around 50 nm, and it is more desirable to use a compound as shown in FIG. 2 among ketocoumarin compounds. FIG. 2A shows 3-3 ′
-Carbonyl bis (7-methoxycoumarin), (b)
Is 2H-1-benzopyran-3-propanoic acid,
7- (Diethylamino)-, beta, 2-dioxo, methyl ester, (c) is 3,3'-carbonylbis [7-butyl-10,10-dimethyl-7,8,9,1
0-tetrahydro-2-oxo-2H-pyrano (2,3
-F) quinoline] and (d) are 3,3'-carbonylbis {7- [N-ethyl-N-butoxyethyl) amino]
Coumarin}, shows (e) is 7-di main Chiruamino 3- thenoyl coumarin.

As the image forming material, dyes, inorganic pigments, organic pigments and the like can be used. Desirably, azo dyes, anthraquinone dyes, indigoid dyes, phthalocyanine dyes, carbonium dyes, quinone imine dyes, methine dyes, quinoline dyes, cyanine dyes, merocyanine dyes, rhodocyanine dyes, carbocyanine Dyes, oxonol dyes, styryl dyes, base styryl dyes, coumarin dyes, phenylmethane dyes, stilbene dyes, dyes such as leuco dyes, monoazo pigments, disazo pigments, azo lake pigments, quinacridone pigments, Organic pigments such as perylene pigments, anthrapyrimidine pigments, isoindolinone pigments, sulene pigments and phthalocyanine pigments, carbon black, graphite, red iron oxide, titanium oxide, molybdenum red, cadmium red, cobalt blue, chrome green, etc. of Machine pigments. These image forming materials may be used alone or in combination of two or more.

Examples of the unsaturated-containing polymerizable substance include a compound having an ethylenically unsaturated group, a compound having an epoxy group, and the like, and a compound having an ethylenically unsaturated group is preferable. Compounds having an ethylenically unsaturated group include acrylic acid and salts thereof, acrylic esters, acrylamides, methacrylic acid and salts thereof, methacrylic esters, methacrylamides, maleic anhydride, maleic esters, itacone Acid esters, styrenes, vinyl ethers, vinyl esters, N-
Examples include vinyl heterocycles, allyl ethers, allyl esters, and derivatives thereof. Particularly desirable,
Acrylic esters or methacrylic esters.

Specific examples of the acrylates include:
Butyl acrylate, cyclohexyl acrylate, ethylhexyl acrylate, benzyl acrylate, furfuryl acrylate, ethoxyethyl acrylate,
Tricyclodecanyloxy acrylate, nonylphenyloxyethyl acrylate, hexanediol acrylate, 1,3-dioxolane acrylate, hexanediol diacrylate, butanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, tricyclodecane dimethylol Diacrylate, tripropylene glycol diacrylate, bisphenol A diacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, hexaacrylate of caprolactone adduct of dipentaerythritol, trimethylolpropane triacrylate, propylene oxide adduct of trimethylolpropane Triacrylate, polyoxyethylene Diacrylate Lanka bisphenol A, polyester acrylate, polyurethane acrylate.

Specific examples of methacrylates include butyl methacrylate, cyclohexyl methacrylate, ethylhexyl methacrylate, benzyl methacrylate, furfuryl methacrylate, ethoxyethyl methacrylate, hexanediol methacrylate, hexanediol dimethacrylate, 1,3-dioxolan methacrylate, butane Diol dimethacrylate,
Neopentyl glycol dimethacrylate, bisphenol A dimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexamethacrylate, hexamethacrylate of caprolactone adduct of dipentaerythritol, trimethacrylate of trimethylolpropane trimethacrylate, and trimethacrylate of propylene oxide adduct of trimethylolpropane And polyoxyethylenated bisphenol A dimethacrylate, polyester methacrylate, and polyurethane methacrylate.

These unsaturated group-containing polymerizable substances may be used alone or as a mixture of two or more.

The composition ratio of the photocurable composition is 0.1 to 10 parts by weight of the image forming material and 0.1 to 20 parts by weight of the metal arene compound when the amount of the unsaturated group-containing polymerizable substance is 100 parts by weight. Parts by weight, 0.1 to 2 for triazine compound
0 parts by weight and the ketocoumarin compound are desirably 0.01 to 10 parts by weight. More preferably, the image forming material is 2 to 5 parts by weight, based on 100 parts by weight of the unsaturated group-containing polymerizable substance.
The metal arene compound is 2 to 10 parts by weight, the triazine compound is 0.5 to 5 parts by weight, and the ketocoumarin compound is 0.1 to 10 parts by weight.
１1 part by weight.

Hereinafter, experimental examples performed to confirm the effects of the present invention will be described.

Experimental Example 1 In Experimental Example 1, an iron arene compound and a triazine compound were used as polymerization initiators, and a coumarin compound, 3,3′-carbonylbis (7-diethylaminocoumarin), was used as a wavelength sensitizer. Each was used to prepare a photocurable composition, and its photosensitivity was examined.

First, 100 parts by weight of a mixture of dipentaerythritol hexaacrylate as an unsaturated group-containing polymerizable substance and phenol acrylate in a ratio of 3: 1 was mixed with an azobarium lake-based pigment using a high-molecular polyurethane as a dispersant. Disperse 3 parts by weight. To this, 0.5 parts by weight of 3-3′-carbonylbis (7-methoxycoumarin) which is a ketocoumarin-based dye as a wavelength sensitizer, N,
N-dimethylaniline (1 part by weight) was added, and (η ⁵ -2,4-cyclopentadien-1-yl) [(1,2,3,4,5,6), which is a polymerization initiator for an iron arene compound, was added.
-[Eta])-(1-methylethyl) benzene] 2 parts by weight of iron (1+) hexafluorophosphate (1-) and tris (trichloromethyl)-which is a triazine-based polymerization initiator.
1.5 parts by weight of s-triazine was added, and the mixture was heated at 100 ° C. for 5 minutes to obtain a photocurable composition for yellow image formation.

Using this photocurable composition, the photosensitivity was measured by the method described below.

EXPERIMENTAL EXAMPLE 2 Next, in Experimental Example 1, instead of 3,3′-carbonylbis (7-diethylaminocoumarin) as a wavelength sensitizer, 2H-1-benzopyran-3-propanoic acid was used.
A photocurable composition for yellow image formation was obtained by the procedure of Experimental Example 1 using 7- (diethylamino)-, beta, 2-dioxo, and methyl ester, and the photosensitivity was measured in the same manner as in Experimental Example 1.

[Experimental Example 3] Next, instead of 3,3'-carbonylbis (7-diethylaminocoumarin) as a wavelength sensitizer in Experimental Example 1, 3,3'-carbonylbis [7-butyl-10 , 1
0-dimethyl-7,8,9,10-tetrahydro-2-
[Oxo-2H-pyrano (2,3-f) quinoline], a photocurable composition for yellow image formation was obtained by the procedure of Experimental Example 1, and the photosensitivity was measured in the same manner as in Experimental Example 1.

Experimental Example 4 Next, in Experimental Example 1, instead of 3,3′-carbonylbis (7-diethylaminocoumarin) as a wavelength sensitizer, 3,3′-carbonylbis {7- [N- Ethyl-N
A photocurable composition for yellow image formation was obtained in the same manner as in Experimental Example 1 by using [-butoxyethyl) amino] coumarin} by the procedure of Experimental Example 1.

[Experimental Example 5] Next, in Experimental Example 1, an experiment was performed using 7-diethylamino-3-thenoylcoumarin instead of 3,3'-carbonylbis (7-diethylaminocoumarin) as a wavelength sensitizer. According to the procedure of Example 1, a photocurable composition for forming a yellow image was obtained, and the photosensitive sensitivity was measured in the same manner as in Experimental Example 1.

[0042] [Experimental Example 6] Next, the polymerization initiator, an iron arene compound used in Experimental Example 1 (eta ^{5-2,4-cyclopentadiene-1-yl)} [(1,2,3 , 4,5,6-η)
-(1-methylethyl) benzene] Only 3.5 parts by weight of iron (1+) hexafluorophosphate (1-) was used as a wavelength sensitizer in 3,3′- used in Experimental Example 1.
Using carbonylbis (7-diethylaminocoumarin), a photocurable composition for forming a yellow image was obtained according to the procedure of Experimental Example 1, and the photosensitivity was measured in the same manner as in Experimental Example 1.

Experimental Example 7 Next, as a polymerization initiator, only 3.5 parts by weight of tris (trichloromethyl) -s-triazine, which is a triazine-based polymerization initiator used in Experimental Example 1, was wavelength-sensitized. As the agent, the photocurable composition for yellow image formation was obtained by the procedure of Experimental Example 1 using 3,3′-carbonylbis (7-diethylaminocoumarin) used in Experimental Example 1. Similarly, the photosensitivity was measured.

Experimental Example 8 Next, in Experimental Example 1, an iron arene compound (η ⁵ -2,4-cyclopentadiene-1-) was used as a polymerization initiator.
Il) [(1,2,3,4,5,6-η)-(1-methylethyl) benzene] iron (1+) hexafluorophosphate (1-) and tris (trichloro) which is a triazine-based polymerization initiator Instead of methyl) -s-triazine,
A photocurable composition for yellow image formation was obtained by the procedure of Experimental Example 1 using 2,4-diethylthioxanthone, which is neither an iron arene compound nor a triazine-based compound. It was measured.

[Experimental Example 9] Next, in Experimental Example 1, instead of tris (trichloromethyl) -s-triazine as a polymerization initiator, 2- (4-chlorophenyl)-
Using 4,6-bis (trichloromethyl) -s-triazine (FIG. 3 (e)), a photocurable composition for forming a yellow image was obtained by the procedure of Experimental Example 1, and the photosensitive sensitivity was the same as in Experimental Example 1. Was measured.

EXPERIMENTAL EXAMPLE 10 Next, in Experimental Example 1, instead of tris (trichloromethyl) -s-triazine which is a triazine-based polymerization initiator, 2-styryl-4,6-bis (trichloro) was used as a polymerization initiator. A photocurable composition for forming a yellow image was obtained by the procedure of Experimental Example 1 using methyl) -s-triazine (FIG. 3E), and the photosensitivity was measured in the same manner as in Experimental Example 1.

[Experimental Example 11] Next, in Experimental Example 1, 3,
3'-carbonylbis (7-diethylaminocoumarin)
In place of 2- [2- {4- (dimethylamino) phenyl} ethynyl] -1-ethylpyridium iodide, a photocurable composition for yellow image formation was obtained by the procedure of Experimental Example 1. Photosensitivity was measured in the same manner as in Experimental Example 1.

Next, as a polymerization initiator, only 3.5 parts by weight of tris (trichloromethyl) -s-triazine, which is a triazine-based polymerization initiator used in Experimental Example 1, was used as a wavelength sensitizer. Using 3,3′-carbonylbis (7-diethylaminocoumarin) used in Example 1, a photocurable composition for forming a yellow image was obtained by the procedure of Experimental Example 1, and the photosensitivity was measured in the same manner as in Experimental Example 1. It was measured.

In the measurement of the photosensitivity of the photocurable composition in each of the above experiments, the photocurable composition was coated on a polyethylene terephthalate (PET) film (25 μm thick) to a thickness of 10 to 15 μm using a bar coater. The same PET is applied on top of it for the purpose of blocking oxygen.
Cover with film. This was measured with a spectral sensitivity meter (manufactured by Narumi Shokai), and the sensitivity at 450 nm was calculated.
Table 1 summarizes the relative sensitivities based on the sensitivity (100). The higher the relative sensitivity, the lower the sensitivity.

[0050]

[Table 1]

A in Table 1 represents (η ⁵ -2,4-cyclopentadien-1-yl) [(1,2,3,4,5,6
-[Eta])-(1-methylethyl) benzene] iron (1+) hexafluorophosphate (1-), and B is 2- [2
-{4- (dimethylamino) phenyl} ethynyl] -1
-Ethylpyridium iodide, C is 2,4-diethylthioxanthone, and a to e are FIGS. 2 (a) to 2 (e).
1, (a) shows (a) of FIG. 1, (b) shows (b) of FIG. 1, and (c) shows (c) of FIG.

As can be seen from the results in Table 1, the photosensitive sensitivities of Experimental Examples 1 to 5 using a ketocoumarin compound as a wavelength sensitizer and Experimental Example 11 using a compound other than a ketocoumarin compound were different. It can be seen that Example 1 is much better.

Further, in the case of Experimental Example 6 using only an iron arene compound as a polymerization initiator, in the case of Experimental Example 7 using only a triazine-based compound, and
In comparison with the case of Experimental Example 8 in which a non-triazine-based compound was used, the use of any one of the iron arene compound and the triazine-based compound as the polymerization initiator was better. It can be seen that the photosensitive sensitivity is good. Further, it is understood that the use of both the iron arene compound and the triazine-based compound as the polymerization initiator further improves the photosensitivity.

Next, a photosensitive capsule using the photocurable composition according to claim 6 as a core substance will be described.

The photosensitive capsule comprises an outer shell and a photocurable composition inside the shell. The average particle size of the photosensitive capsule is desirably 5 μm to 50 μm, but is not particularly limited.

The photocurable composition is the composition described in the above embodiment.

The photosensitive capsule can be prepared by a method known in the art. For example, US Patent No. 280045
No. 7, No. 2,800,458, a phase separation method from an aqueous solution, which is disclosed in JP-B-38-1974, JP-B-42-446, and JP-B-42-771. Interfacial polymerization method, JP-B-36-916
No. 8, JP-A-51-9079, etc., in-situ method by polymerization of monomers, British Patent No. 95
There are, but not limited to, the melting dispersion cooling method described in JP-A Nos. 2807 and 965074.

The material for forming the outer shell may be an inorganic substance or an organic substance as long as it can be used in the above-mentioned capsule manufacturing method. Desirably, the material is an organic substance that can sufficiently transmit light.

Specific examples include gelatin, gum arabic, starch, sodium alginate, polyvinyl alcohol, polyethylene, polyamide, polyester, polyurethane, polyurethane, polyurethane, polystyrene, nitrocellulose, ethylcellulose, methylcellulose, melamine-formaldehyde resin, and urea-formaldehyde. Examples include resins and the like and copolymers thereof.

Next, an example will be described. However, the present invention is not limited to this example, and the materials used, their ratios and production conditions are changed within the range described so far. It can also be implemented.

A yellow image recording photosensitive capsule containing a yellow pigment and having a photosensitivity near 450 nm is prepared.

The method of preparing the photocurable composition serving as the core substance is in accordance with each of the above experimental examples. Here, the curable composition for yellow image recording obtained in Experimental Example 1 was used.

First, the photocurable composition of Experimental Example 1 was placed in 100 cc of a 1: 1 aqueous solution of a 5% polystyrenesulfonic acid partial sodium salt aqueous solution and a 5% styrene-maleic anhydride copolymer aqueous solution as an emulsifier. Is added, and the mixture is stirred at 6000 rpm for 5 minutes with a homogenizer, and the liquid component is present as a droplet having a size of 5 to 20 μm in the aqueous solution.
A so-called O / W emulsion was obtained.

Separately, commercially available melamine powder was added to a 37% aqueous formaldehyde solution, adjusted to pH 9.0 with a sodium hydroxide solution, and heated at a water temperature of 60 ° C. for 30 minutes to obtain a melamine / formaldehyde prepolymer.

Melamine / formaldehyde prepolymer was added to the O / W emulsion prepared above, and the mixture was stirred for 5 hours at 100 to 300 rotations with an azimohomomixer while maintaining the water temperature at 80 ° C. for 5 hours. Thereafter, the pH was adjusted to pH 7 and cooled to room temperature. As a result, a melamine-formaldehyde resin wall material was deposited around the droplets of the O / W emulsion, and a photosensitive capsule for yellow image recording was obtained.

The evaluation of the photocurable composition and the evaluation after the encapsulation show that the photosensitivity tends to be slightly lower after the encapsulation, but otherwise the characteristics do not change at all. Absent. Therefore, even after the encapsulation, the same result as that of the photocurable composition is obtained.

The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the present invention.

The present invention is not limited to the experimental examples, and the materials used, the ratios thereof, and the manufacturing conditions may be changed within the ranges described above.

Further, an alkylaniline or the like may be mixed as a wavelength sensitizer.

[0070]

As apparent from the above description, according to the photocurable composition of the present invention, as a ketocoumarin compound as a wavelength sensitizer, "2H-1-benzopyran-3- amine " is used.
Propanoic acid, 7- (diethylamino)-,
Or 2-dioxo, methyl ester ”or“ 3, 3 ′
-Carbonylbis [7-butyl-10,10-dimethyl
-7,8,9,10-tetrahydro-2-oxo-2H
- pyrano (2,3-f) key Norin] "or" 3,3 '
-Carbonylbis {7- [N-ethyl-N-butoxye
Tyl) amino] coumarin｝ ”is used to absorb and excite the wavelength of light. At this time, electrons move to the polymerization initiator, and the polymerization of the unsaturated group-containing polymerizable substance is started. the initiated cured portions, to obtain a dye, an image-forming material without a runoff child is outside such as a pigment, for locations that do not cure, the desired image by discharging the said imaging material to the outside, the Even if an image forming material is contained, it is possible to prevent a decrease in photosensitivity.

Further, when a metal arene compound is used as the polymerization initiator, electrons generated by excitation of the ketocoumarin compound as the wavelength sensitizer are easily transferred to the metal arene compound, so that the photosensitivity is further reduced. Can be prevented.

Further, when a triazine compound is used as the polymerization initiator, electrons generated from the ketocoumarin compound are transferred to the triazine compound even in a region where light illuminance is low, so that a decrease in photosensitivity can be inexpensively prevented. be able to.

When a mixture of a metal arene compound and a triazine compound is used as the polymerization initiator,
Since the incidence of polymerization of metal arene compounds and triazi compounds, the ease of energy transfer with ketocoumarin compounds, and the reactivity with unsaturated group-containing polymerizable substances are moderately different, the sensitivity is further increased. Can be enhanced.

When an iron arene compound is used as the metal arene compound, the sensitivity can be further improved.

Further, a photosensitive capsule is prepared using the photocurable composition as a core substance, and the photosensitive capsule is exposed. When the photosensitive capsule is exposed to the light having the predetermined wavelength, the unsaturated group-containing polymerizable substance is exposed. Polymerized, cured, even when pressing the photosensitive capsule, the image forming material does not flow out, but when exposed to light other than the predetermined wavelength, because the unsaturated group-containing polymerizable material does not polymerize, When the photosensitive capsule is pressed, the image forming material flows out of the capsule and is transferred to an image receiving paper, so that a photosensitive capsule capable of easily performing full-color printing can be provided. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a specific chemical formula of a triazine-based compound.

FIG. 2 is a view showing a specific chemical formula of a ketocoumarin compound.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI G03F 7/029 G03F 7/031 7/031 B01J 13/02 Z (58) Fields investigated (Int. Cl. ⁷ , DB name) G03F 7/004 G03F 7/029 G03F 7/031 B01J 13/02 C08F 2/50 C08F 4/00

Claims (6)

(57) [Claims] 1. An image forming material such as a dye or a pigment, an unsaturated group-containing polymerizable material which is cured by polymerization, a polymerization initiator for initiating polymerization of the unsaturated group-containing polymerizable material, A ketocoumarin compound as a wavelength sensitizer for initiating the polymerization action of the polymerization initiator by absorbing a wavelength , and wherein the ketocoumarin compound is "2H-1-benzopi
Run-3-propanoic acid, 7- (diethylamino)
-, Beta, 2-dioxo, methyl ester "or
"3,3'-carbonylbis [7-butyl-10,10
-Dimethyl-7,8,9,10-tetrahydro-2-o
Oxo-2H-pyrano (2,3-f) quinoline] "or
"3,3'-carbonylbis {7- [N-ethyl-N-
Butoxyethyl) amino] coumarin｝ ”
A photocurable composition comprising: 2. The photocurable composition according to claim 1, wherein the polymerization initiator is composed of a metal arene compound. 3. The photocurable composition according to claim 1, wherein the polymerization initiator is composed of a triazine compound. 4. The photocurable composition according to claim 1, wherein the polymerization initiator is composed of a mixture of a triazine compound and a metal arene compound. 5. The photocurable composition according to claim 2, wherein the metal arene compound is an iron arene compound. 6. A photosensitive capsule comprising the photocurable composition according to claim 1 as a core substance.