JPH08217810A - Photocurable composition and photosensitive capsule - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a photocurable composition and a photosensitive capsule which have high sensitivity even when an image forming material such as a dye or a pigment is contained and which hardly cause a reversal phenomenon. [Structure] When exposed to light of a predetermined wavelength of intensity,
The polymerization of the unsaturated group-containing polymerizable substance is initiated by the triazine-based compound as the polymerization initiator, the photocurable composition is cured, and the dye, the image forming material such as the pigment is prevented from flowing out to a predetermined level. Since the unsaturated group-containing polymerizable substance does not polymerize when exposed to light having a wavelength other than the above wavelength, when an external pressure is applied to the photocurable composition, an image forming material such as a dye or a pigment flows out to the outside. Get an image of.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a method of forming an image using a photosensitive capsule has been researched.
No. 6559, No. 5-68871, and No. 5-29.
Japanese Patent No. 7552 and the like disclose an encapsulated toner using a photosensitive capsule that cures in response to light. Further, it is also practiced to prepare a photosensitive recording medium in which such a photosensitive capsule is preliminarily carried on a film and use this for image formation.

The photosensitive capsule comprises a photocuring agent comprising 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 the polymerization of the polymerizable substance. The mold composition is included. When performing image formation, after exposing the photosensitive capsules to polymerize and cure the photocurable composition contained in the capsules,
An image is formed by destroying only the weakly sensitive photosensitive capsules by pressure or the like, causing the image forming material such as dye contained in the capsules to flow out, and transferring this to the image receiving paper.

Various polymerization initiators are used, but a metal arene compound has been used as disclosed in JP-A-2-296802. When this metal arene compound is used, the photosensitivity is improved as compared with other photopolymerization initiators. In addition, since the photo-curing wavelength can be brought to the visible region, it is not necessary to use ultraviolet light, so that the cost of the light source is low, and there is an advantage that the coloring of the image forming material such as dye is not hindered. .

[0005]

However, in the photocurable composition and the photosensitive capsule disclosed in the above publications, the sensitivity is improved by using the metal arene compound, but the images of dyes, pigments, etc. are improved. When the forming material is contained, the sensitivity is remarkably lowered, resulting in a problem that sufficient sensitivity cannot be obtained.

Further, when the number of image forming materials is increased in order to increase the image density, there has been a problem that the reversal phenomenon appears remarkably. The inversion phenomenon is a phenomenon in which it becomes difficult to cure when the exposure light has a certain intensity or more. Although simple, the inversion phenomenon will be described below.

In the above-mentioned image forming apparatus using the photosensitive capsules, the photosensitive capsules are not cured in the low energy region, so that all the image forming material is released and the image density is increased, and as the energy is increased, the photosensitivity is increased. The capsule hardens and the image density decreases.

Therefore, the exposure amount E (lo
A characteristic curve representing the relationship between gE) and the image density D is obtained,
The slope is α and tan α = γ (gamma).

At this time, the energy on the horizontal axis is the product of the irradiation intensity (lux) of the light and the irradiation time (seconds). Therefore, when the energy value is fixed to a certain value, the irradiation time is inevitably shortened. It is necessary to increase the irradiation intensity. Normally, the characteristic curve does not change even if the irradiation time is changed, but if the irradiation time is shortened and the irradiation intensity exceeds a certain value, it may be difficult to cure. This is called a reversal phenomenon, and as shown in FIG. 3, when the irradiation time is shortened, the completely cured region becomes narrow, so that the image density becomes high and finally the completely cured region disappears.

The present invention has been made in order to solve the above-mentioned problems, and has a high sensitivity even when an image forming material such as a dye or a pigment is contained, and a photocurable composition which hardly causes a reversal phenomenon. The object is to provide an article and a photosensitive capsule.

[0011]

In order to achieve this 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 substance which is cured by polymerization. And a triazine-based compound as a polymerization initiator for initiating the polymerization of the unsaturated group-containing polymerizable substance.

The above triazine-based compound is used as 2, 4, 6-
Tris (trichloromethyl) -s-triazine, 2-
(4-Methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio)
Phenyl] -4,6-bis (trichloromethyl) -s-
Triazine, 2- [4- (methylthio) styryl]-
4,6-bis (trichloromethyl) -s-triazine,
2- (4-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine and the like may be used alone or in combination of two or more.

Further, as the image forming material, any one kind of dyes, inorganic pigments, organic pigments or the like, or a mixture of plural kinds thereof may be used.

Further, as the unsaturated group-containing polymerizable substance, any one kind of a compound having an ethylenically unsaturated group, a compound having an epoxy group, or the like, or a mixture of plural kinds thereof may be used.

Further, a photosensitive capsule containing the photocurable composition according to any one of claims 1 to 4 as a core substance may be prepared.

[0016]

When the photocurable composition of the present invention having the above-mentioned constitution is exposed to light of a predetermined wavelength, the triazine compound as a polymerization initiator initiates the polymerization of the unsaturated group-containing polymerizable substance, The photocurable composition is cured to prevent the image forming materials such as dyes and pigments from flowing out, and the unsaturated group-containing polymerizable substance does not polymerize when exposed to light having a wavelength other than a predetermined wavelength. When pressure is applied to the photocurable composition from the outside, image forming materials such as dyes and pigments flow out to obtain a desired image.

Further, the triazine-based compound is
4,6-tris (trichloromethyl) -s-triazine, 2- (4-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio) phenyl] -4, 6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio) styryl] -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxystyryl) -4,6- When any one kind or a mixture of plural kinds of bis (trichloromethyl) -s-triazine is used, the energy at which the inversion phenomenon occurs in which the curing becomes difficult when the irradiation intensity exceeds a certain value (energy) Becomes higher.

A desired color can be obtained by using, as the image forming material, any one kind of dyes, inorganic pigments, organic pigments or the like or a mixture of plural kinds thereof.

Further, the transfer rate of radicals, electrons, protons, etc., which are reactive species, and the reaction rate of the ethylenically unsaturated group- or epoxy group-based compound are matched, and the photosensitivity is improved.

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

[0021]

EXAMPLES An example of a photocurable composition embodying the present invention will be described below.

The photocurable composition comprises an image-forming material such as a dye or a pigment, an unsaturated group-containing polymerizable substance, and a triazine-based compound.

The triazine-based compound is one which is sensitive to light and initiates the polymerization of the unsaturated group-containing compound, and is represented by the following chemical formula.

[0024]

Embedded image

Among the above chemical formulas, R shown in FIG. 1 is used, (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, and (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
It shows-(2-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine.

As the image forming material, dyes, inorganic pigments, organic pigments and the like can be used. Desirably, xanthene dye, coumarin dye, merocyanine dye, thiazine dye, azine dye, methine dye, oxazine dye, phenylmethane dye, cyanine dye, azo dye, anthraquinone dye, pyrazoline dye Dyes, stilbene dyes, quinoline dyes, leuco dyes, etc.,
Organic pigments such as monoazo pigments, disazo pigments, azo lake pigments, quinacridone pigments, perylene pigments, anthrapyrimidine pigments, isoindolinone pigments, slene pigments, phthalocyanine pigments, carbon black,
Inorganic pigments such as yellow lead, red iron oxide, titanium oxide, molybdenum red, cadmium red, cobalt blue, and chrome green are listed. These image forming materials may be used alone or as a mixture of two or more kinds. In the case of wavelength sensitization, it is necessary to add a dye serving as a wavelength sensitizer, that is, a wavelength sensitizing dye, and the wavelength sensitizing dye can also be used as the dye mentioned above as the image forming material.

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

Specific examples of acrylic acid esters 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 Of triacrylate, polyoxyethylene Diacrylate Lanka bisphenol A, polyester acrylate, polyurethane acrylate.

Specific examples of the methacrylic acid esters include butyl methacrylate, cyclohexyl methacrylate, ethylhexyl methacrylate, benzyl methacrylate, furfuryl methacrylate, ethoxyethyl methacrylate, hexanediol methacrylate,
1,3-dioxolane methacrylate, hexanediol dimethacrylate, butanediol dimethacrylate, neopentyl glycol dimethacrylate, bisphenol A dimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexamethacrylate, hexamethacrylate of caprolactone adduct of dipentaerythritol, Trimethylolpropane trimethacrylate, trimethylolpropane propylene oxide adduct trimethacrylate, polyoxyethylenated bisphenol A dimethacrylate,
Examples thereof include polyester methacrylate and polyurethane methacrylate.

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

Next, an example of an experiment conducted to confirm the effect of the present invention will be described.

[Experimental Example 1] In Experimental Example 1, a photocurable composition for yellow image formation containing the triazine compound as a photopolymerization initiator (invention product) was prepared by the following procedure.
Then, a photocurable composition for forming a yellow image (comparative product) containing an iron arene compound was prepared, and its photosensitivity and relative energy when a reversal phenomenon occurred were examined.

(1) 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 added to 100 parts by weight of high molecular weight polyurethane as a dispersant for azobarium lake. Disperse 3 parts by weight of the pigment. 0.5 parts by weight of coumarin dye, 1 part of N, N-dimethylaniline
2 parts by weight of tris (trichloromethyl) -s-triazine, which is a photopolymerization initiator, was added while adding 1 part by weight.
By heating at 00 ° C. for 5 minutes, a photocurable composition for yellow image formation containing a yellow pigment and having a photosensitivity in the vicinity of 450 nm was obtained.

(2) On the other hand, as a comparative product, an iron arene compound was used as a photopolymerization initiator to prepare a photocurable composition for yellow image formation. The preparation method is the same as above, but without adding the tris (trichloromethyl) -s-triazine, (η ⁵ -2,4-cyclopentadien-1-yl) [(1, 2, 3, 4, 5,6-η)-(1
-Methylethyl) benzene] iron (1+) hexafluorophosphate (1-) was added.

(3) The photosensitivity of the photocurable composition for yellow image formation prepared in (1) above and the photocurable composition for yellow image formation of the comparative product prepared in (2) above were measured. , And measured with a spectral sensitometer (Narumi Shokai) to calculate the sensitivity.

[Experimental Example 2] Next, in Experimental Example 1, as a polymerization initiator, instead of 2,4,6-tris (trichloromethyl) -s-triazine, 2- (4-methoxyphenyl) -4, 6-bis (trichloromethyl) -s-
A photocurable composition for yellow image formation was obtained using triazine by the procedure of Experimental Example 1, and the photosensitivity was measured in the same manner as in Experimental Example 1.

[Experimental Example 3] Next, in Experimental Example 1, as a polymerization initiator, 2- [4- (methylthio) phenyl]-was used instead of 2,4,6-tris (trichloromethyl) -s-triazine. 4,6-bis (trichloromethyl)
A photocurable composition for yellow image formation was obtained using the procedure of Experimental Example 1 using -s-triazine, and the photosensitivity was measured in the same manner as in Experimental Example 1.

[Experimental Example 4] Next, in Experimental Example 1, as a polymerization initiator, 2- [4- (methylthio) styryl]-was used instead of 2,4,6-tris (trichloromethyl) -s-triazine. 4,6-bis (trichloromethyl)
A photocurable composition for yellow image formation was obtained using the procedure of Experimental Example 1 using -s-triazine, and the photosensitivity was measured in the same manner as in Experimental Example 1.

[Experimental Example 5] Next, in Experimental Example 1, as a polymerization initiator, instead of 2,4,6-tris (trichloromethyl) -s-triazine, 2- (4-methoxystyryl) -4, 6-bis (trichloromethyl) -s-
A photocurable composition for yellow image formation was obtained using triazine by the procedure of Experimental Example 1, and the photosensitivity was measured in the same manner as in Experimental Example 1.

The method for calculating the photosensitivity is that the thickness is 25 μm.
m polyethylene terephthalate (PET) film, each of the photocurable compositions was applied by a bar coater to a thickness of 10 to 15 μm, and the same PET was further applied thereon for the purpose of blocking oxygen. Then, it was placed on a spectral sensitometer (manufactured by Narumi Shokai) and the photosensitivity of each photocurable composition was measured.

Table 1 shows the measurement results of the above-mentioned photosensitive sensitivities.
In addition, the measurement results are shown as relative sensitivity with reference to (100) using an iron arene compound as a photopolymerization initiator, and the smaller the value, the higher the photosensitivity.

Further, the relative energy when the inversion phenomenon occurs is determined as follows.

The PET sandwiching the photocurable composition is exposed for 2 seconds by using one film (step tablet) having different transmittances stepwise. Then two PEs
Peel off T, absorb the uncured photocurable composition on the image receiving paper, measure the density of the colored portion formed on the image receiving paper with a Macbeth reflection densitometer, and logarithm of the exposure amount E on the horizontal axis (LogE) , The concentration is plotted on the vertical axis, and a characteristic curve representing the relationship between irradiation energy and concentration is prepared for each initiator. In this characteristic curve, the energies on the higher energy side than the minimum concentration and when the concentration exceeds 0.1 are considered as the energy at which the reversal phenomenon occurs (hereinafter referred to as reversal energy), and the energies were compared. In Table 1, the inversion energy when using an iron arene compound is used as a reference (1
00) and the relative reversal energy is displayed.
The larger the value, the less likely the inversion phenomenon occurs.

[0044]

[Table 1]

Although each of the above experimental examples was conducted on the photocurable composition for forming a yellow image, an experiment is also conducted on a photocurable composition for forming a magenta image.

[Experimental Example 6] In Experimental Example 6, a photocurable composition for magenta image formation (a product of the present invention) containing a triazine compound as a photopolymerization initiator, and a magenta image containing an iron arene compound. A photocurable composition (comparative product) for forming was prepared, and its photosensitivity and relative energy when a reversal phenomenon occurred were examined.

The method for preparing the photocurable composition for forming each magenta image is almost the same as the method for preparing the photocurable composition for forming a yellow image in Experimental Example 1, and Experimental Example 1
3 parts by weight of azobarium lake pigment, 0.5 parts by weight of coumarin dye, 3 parts by weight of quinacridone pigment, 0.5 parts by weight of isoindolinone dye are used to contain a magenta pigment, A photocurable composition for forming a magenta image having a photosensitivity in the vicinity of 550 nm was prepared.

Then, in the same manner as in Experimental Example 1,
The photosensitivity of each photocurable composition for forming a magenta image and the relative energy when the reversal phenomenon occurred were examined, and Table 2
Summarized in. The standard values are those of the iron arene compounds shown in Table 1.

[0049]

[Table 2]

Next, an experiment is conducted on a photocurable composition for forming a cyan image.

[Experimental Example 7] In Experimental Example 7, a photocurable composition for cyan image formation (a product of the present invention) containing a triazine compound as a photopolymerization initiator, and a cyan image containing an iron arene compound were used. A photocurable composition (comparative product) for forming was prepared, and its photosensitivity and relative energy when a reversal phenomenon occurred were examined.

The method for preparing the photo-curable composition for forming each cyan image is almost the same as the method for preparing the photo-curable composition for forming a yellow image in Experimental Example 1, that is, azobarium in Experimental Example 1. Instead of 3 parts by weight of the lake pigment and 0.5 parts by weight of the coumarin dye, 3 parts by weight of the phthalocyanine pigment and 0.5 parts by weight of the squarylium dye are used to contain the cyan pigment, and the photosensitivity is around 650 nm. To prepare a photocurable composition for forming a cyan image.

Then, in the same manner as in Experimental Example 1,
The photosensitivity of each photocurable composition for forming a cyan image and the relative energy when the reversal phenomenon occurred were investigated and summarized in Table 3. The standard values are those of the iron arene compounds shown in Table 1.

[0054]

[Table 3]

From the results shown in Tables 1 to 3, the sensitivity was higher when the triazine compound was used than the metal arene compound,
Moreover, it is clear that the inversion phenomenon is unlikely to occur.

Although not all of the polymerization initiators shown in FIG. 1 were tested, experiments were carried out for those having a typical structure as shown in Table 1, and the results and the structure of the untested polymerization initiator were compared. It is believed that the untested initiator is more sensitive than the metal arene compound when compared with each other.

Next, the photosensitive capsule according to claim 5 in which the photocurable composition is a core substance will be described.

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

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

As the method for producing the photosensitive capsule, it is possible to produce it by a method already known in the art. For example, US Pat.
No. 7, No. 2,800,458, etc., a method for phase separation from an aqueous solution, as shown in Japanese Examined Patent Publication No. 38-1974, No. 42-446, No. 42-771. Interfacial polymerization method as described in JP-B-36-916
No. 8, JP-A-51-9079, etc., in-situ method by polymerization of monomers, British Patent No. 95.
2807 and 965074, there are melt dispersion cooling methods and the like, but the invention is not limited to these.

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 capsule manufacturing method. Desirably, it is an organic substance, and a material capable of sufficiently transmitting light is more preferable.

Specific examples include gelatin, gum arabic, starch, sodium alginate, polyvinyl alcohol, polyethylene, polyamide, polyester, polyurethane, polyurea, polyurethane, polystyrene, nitrocellulose, ethyl cellulose, methyl cellulose, melamine-formaldehyde resin, urea-formaldehyde. Examples thereof include resins and their copolymers.

Next, an example will be described, but the present invention is not limited to this example, and the materials to be used, the amount ratio thereof and the manufacturing conditions are changed within the range described so far. However, it can be implemented.

The method for producing the photocurable composition to be the core substance is in accordance with the above experimental examples. Here, the curable composition for yellow image recording obtained in Experimental Example 1 was used.

First, the hydrophobic photocurable composition was added to 100 cc of a 1: 1 aqueous solution of a 5% polystyrene sulfonic acid partial sodium salt aqueous solution as an emulsifier and a 5% styrene-maleic anhydride copolymer aqueous solution. In addition, the mixture was stirred with a homogenizer at 6000 rpm for 5 minutes to obtain a so-called O / W emulsion in which the liquid component was present in the aqueous solution as droplets having a size of 5 to 20 μm.

Separately from this, a 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 revolutions with an Ajihomomixer while keeping the water temperature at 80 ° C. for 5 hours. Then, it was adjusted to PH7 and cooled to room temperature. As a result, a wall material of melamine-formaldehyde resin was deposited around the droplets of the O / W emulsion, and a yellow photosensitive capsule emulsion was obtained.

There is a tendency that the sensitivity after the encapsulation is slightly lower between the evaluation with the photocurable composition and the evaluation after the encapsulation, but other characteristics do not change at all. . Therefore, the experimental data after encapsulation is not particularly described.

Further, in the above-mentioned embodiments, the method for producing the yellow photosensitive capsule is described, but magenta and cyan can be produced by the same method.

The present invention described above is not limited to the above-mentioned embodiments, and can be modified within the scope of the invention, and within the range described so far, the materials used, the amount ratios thereof, and The manufacturing conditions may be changed.

[0071]

As is apparent from the above description, according to the photocurable composition of the present invention, when exposed to light having an intensity of a predetermined wavelength, an unsaturated group is formed by a triazine compound as a polymerization initiator. Prevents the photo-curable composition from curing by polymerization of the contained polymerizable substance and causing the image forming materials such as dyes and pigments to flow out to the outside, and becomes unsaturated when exposed to light other than the predetermined wavelength. Since the group-containing polymerizable substance does not polymerize, when pressure is applied to the photocurable composition from the outside, image forming materials such as dyes and pigments flow out to obtain a desired image. The desired location can be cured in time.

Further, the triazine-based compound is
4,6-tris (trichloromethyl) -s-triazine, 2- (4-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio) phenyl] -4, 6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio) styryl] -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxystyryl) -4,6- When any one kind or a mixture of plural kinds of bis (trichloromethyl) -s-triazine is used, the energy at which the inversion phenomenon occurs in which the curing becomes difficult when the irradiation intensity exceeds a certain value (energy) Therefore, a light source having a high light intensity can be used as the exposure light source and can be cured in a short time.

Since a desired color can be obtained by using a material in which any one of dyes, inorganic pigments, organic pigments, etc., or a mixture of a plurality of types is used as the image forming material, full color printing is performed. Can be used as a material.

Further, the transfer rate of radicals or electrons, protons, etc., which are the reaction species, and the reaction rate of the ethylenically unsaturated group- or epoxy group-based compound are matched to improve the photosensitivity, so that a clear image is obtained. Can be obtained.

Further, when a photosensitive capsule is prepared by using the photocurable composition as a core substance, and the photosensitive capsule is exposed to light of the predetermined wavelength, the unsaturated group-containing polymerizable substance is used. Polymerization, curing, even when pressing the photosensitive capsules, the image-forming material does not flow out, but when exposed to light other than the predetermined wavelength, the unsaturated group-containing polymerizable substance does not polymerize, When the photosensitive capsule is pressed, the image forming material flows out from the capsule and can be transferred to the image receiving paper, so that it is possible to provide a photosensitive capsule that can easily perform full-color printing. And so on.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a relationship between an exposure amount of a photocurable composition and an image density.

FIG. 3: Irradiation time of 0.5, 1.0, 3.0, 10.0
It is a figure which shows the relationship between the exposure amount of a photocurable composition, and image density when changing with seconds.

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Claims (5)

[Claims] 1. An image forming material such as a dye or a pigment, an unsaturated group-containing polymerizable substance that is cured by polymerization, and a triazine-based initiator as a polymerization initiator for initiating the polymerization of the unsaturated group-containing polymerizable substance. A photocurable composition comprising a compound. 2. The triazine-based compound is 2, 4, 6
-Tris (trichloromethyl) -s-triazine, 2-
(4-Methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- [4- (methylthio)
Phenyl] -4,6-bis (trichloromethyl) -s-
Triazine, 2- [4- (methylthio) styryl]-
4,6-bis (trichloromethyl) -s-triazine,
2- (4-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine and the like, any one kind or a mixture of a plurality of kinds is used. The photocurable composition described. 3. The image forming material is a dye, an inorganic pigment,
The photocurable composition according to claim 1, wherein any one kind of organic pigments or a mixture of plural kinds of materials is used. 4. The unsaturated group-containing polymerizable substance is one of a compound having an ethylenically unsaturated group, a compound having an epoxy group or the like, or a material obtained by mixing a plurality of types. The photocurable composition according to claim 1. 5. A photosensitive capsule comprising the photocurable composition according to any one of claims 1 to 4 as a core substance.