JP2801007B2 - recoding media - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording medium used for multicolor image recording.

[Conventional technology]

Conventionally, the use of photopolymerization to form multi-color images has been called “The Mead Microencapsulated Imaging System” (“The Mead Microencapsulated Imaging System”).
Imaging System "SPSE 23rd Fall Symposium on Microim
agnig Technology November 15, 1983) and U.S. Pat. No. 4,399,209.

However, the photosensitive wavelength range of the photopolymerization initiator has a large overlap, and the photopolymerization initiator and the ultraviolet absorber are combined as described in, for example, US Pat. Without irradiating light of the wavelength, it was not possible to divide into three photosensitive wavelength regions. In addition, the bandpass filter requires a high energy light source because of its low transmittance. The high-energy light source is large in size and is large in size as a device for obtaining multicolor recording, and the device cost is large, which is not practically desirable.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned conventional problems, and there is little overlap in the photosensitive wavelength region of the photopolymerization initiator, and moreover, a comparative example such as a fluorescent lamp is used. An object of the present invention is to provide a recording medium capable of obtaining a clear multicolor image even with low energy light.

[Means for solving the problem]

The above object is a recording medium used for forming a transfer image by applying light and heat energy, wherein a recording layer on a support contains at least a compound having an unsaturated double bond and a photopolymerization initiator. Capsules (hereinafter, appropriately referred to as "elementary bodies") (A), (B) and (C), wherein the photopolymerization initiator in the microcapsules (A) is represented by the general formula (I) (Wherein R ₁ is an alkyl group having 1 to 6 carbon atoms, or a phenyl group which may be a substituent, and R ₂ is a phenyl group which may have a substituent). Including a certain compound, the absorption maximum of the photopolymerization initiator in the microcapsule (B) is in the wavelength range of 360 to 430 nm, and the absorption maximum of the photopolymerization initiator in the microcapsule (C) is in the wavelength range of 430 nm or more. The photopolymerization initiators have different absorption maximum wavelengths, and the microcapsules (A), (B), and (C) each contain a different colorant or color former. This is achieved by a recording medium.

The recording medium of the present invention comprises a support and a transfer recording layer provided on the support. The transfer recording layer is composed of granular microcapsules (hereinafter, appropriately referred to as "elementary body"), and at least a compound having an unsaturated double bond in the elementary body;
A photopolymerization initiator.

It is desirable that the wavelength range of light for sensitizing the photopolymerization initiator used in the recording medium of the present invention be divided within a range of about 300 to 600 nm. This is because many photopolymerization initiators contain an aromatic ring in the molecule and have an absorption band based on the π → π * transition of the aromatic ring at 300 nm or less, so they are sensitive to light at 300 nm or less. , It becomes difficult to separate the photosensitive wavelength range,
In addition, sufficient sensitivity cannot be obtained with light having a wavelength longer than 600. The compound represented by the above general formula (I) is extremely effective in dividing the photosensitive wavelength range because it gives the maximum sensitivity to light of 360 nm or less.

Hereinafter, the photopolymerization initiator of the general formula (I) contained in the element body (A) will be described.

The substituent in R ₁ and R ₂ of the general formula (I) is
To 6 alkyl groups, alkoxy groups, thioalkyl groups; examples thereof include a halogen atom, a hydroxyl group, a cyano group, a trifluoromethyl group, a carboxyl group, and a nitro group.

Further, the photopolymerization initiator of the general formula (I) has a maximum absorption maximum of about 250 nm to 360 nm, preferably about 250 nm to 340 nm.

Here, the maximum absorption maximum of the photopolymerization initiator refers to the maximum peak when the absorbance of the photopolymerization initiator is measured in chloroform.

The compound represented by the general formula (I) may further improve sensitivity when used in combination with amines. As the amine used in combination, as the aromatic amine, ethyl-p-dimethylaminobenzoate, methyl-p-dimethylaminobenzoate, isoamyl-p-dimethylaminobenzoate, phenyl-p-dimethylaminobenzoate,
Ethyl-p-diethylaminobenzoate, phenyl-
p-Diethylaminobenzoate, N, N-dimethylaniline, N, N-diethylaniline, N, N-dimethylbenzylamine, N-benzyl-N-methylaniline, N, N-dibenzylaniline, triphenylamine, etc. .

Examples of the aliphatic amine include trimethylamine, triethylamine, tripropylamine, dimethylcyclohexylamine, and triethanolamine.

Examples of the polyamine include methylenediain, hexamethylenediamine, 1,4-cyclohexanediamine, phenylenediamine and the like.

The above-mentioned amines may be used alone or in combination of two or more. The photopolymerization initiator of the general formula (I) is used in an amount of about 1: 5 with respect to a polymerizable compound having an unsaturated double bond described below.
It can be used in the range of up to about 1: 1000, preferably from about 1:10 to about 1: 100. The amines are used in the range of about 1:10 to about 10: 1 with respect to the compound of the formula (I).

Furthermore, the sensitivity of the compound of the general formula (I) is improved when used in combination with camphorquinone. This is because the compound of the general formula (I) absorbs light, forms an exciplex with camphorquinone, and transfers two carbonyl groups fixed to cis-type in the molecule of camphorquinone by energy transfer or one-electron transfer. Is thought to be due to the cleavage of the C—C bond to generate a radical.

Camphorquinones are used as compounds of the general formula (I).
It is used in the range from 1:10 to about 10: 1, more preferably from about 1: 5 to about 5: 1.

Specific examples of the compound of the general formula (I) include the following, but the present invention is not limited thereto.

The compound of the general formula (I) is synthesized according to the following formula.

That is, 7-hydroxy-3-benzoylcoumarin derivative 3 is obtained by adding 2,4-dihydroxybenzaldehyde ( 1 ) and methyl benzoylacetate derivative ( 2 ) to a few drops of piperidine in ethanol and stirring (heating if necessary). Can be

3 is the target compound by heating under acid condition with acid anhydride
4 , and heated in THF in the presence of a benzoyl chloride derivative and pyridine to give the desired compound 4 '.

 Specific examples of synthesis are shown below.

Synthesis Example 1) 7-acetoxy-3-benzoylcoumarin 2,4-dihydroxybenzaldehyde 5.52 g (0.04M)
And 7.62 g (0.04 M) of ethyl benzoyl acetate were dissolved in about 80 ml of ethanol.

Then, 15 drops of piperidine were added to the reaction solution, and the mixture was heated under reflux for 2 hours. After cooling, the precipitated solid was separated by filtration and reconstituted with ethanol to give 7-hydroxy-3-benzocoucoumarin 7.58.
g was obtained (yield 71%).

Next, 2 g of 7-hydroxy-3-benzoylcoumarin was dissolved in 15 ml of acetic anhydride, and 2 to 3 drops of dilute sulfuric acid was added.
After cooling, the precipitated solid was collected by filtration, washed sufficiently with water, finally lightly washed with cold ethanol and dried to obtain 1.98 g of 7-acetoxy-3-benylcoumarin (yield 85.5).
%).

Melting point 170-172 ° C (trace melting point measuring instrument), maximum absorption wavelength λ
max (in chloroform) 295,327 nm, identified by IR analysis Synthesis Example 2) 7- (4'-trifluoromethylbenzoyloxy) -3-benzoylcoumarin 7-hydroxy-3-benzoylcoumarin (Synthesis Example 1)
2.68 g (0.01 M) and about 1 g of pyridine are dissolved in 60 ml of THF, and 2.64 g (0.013 M) of 4-trifluoromethylbenzoyl chloride is added thereto while stirring the reaction solution.
A solution dissolved in 0 ml of THF was added dropwise over 30 minutes.

After the addition of the reaction solution, the mixture was further stirred for 1 hour (room temperature).
Next, the reaction solution was added to 200 ml of water, stirred vigorously for 30 minutes, and the precipitated solid was filtered off, washed with cold ethanol and dried, and then dried in 7- (4'-trifluoromethylbenzoyloxy).
3.0 g of -3-benzoylcoumarin was obtained (yield 69%).

Melting point 214-216 ° C (trace melting point measuring instrument), maximum absorption wavelength λ
max (in chloroform) 295,330 nm, identified by IR analysis Next, the photopolymerization initiator in the element body (B) will be described. The photopolymerization initiator in the element (B) has an absorption maximum in the range of 360 to 430 nm. In addition, the absorption maximum referred to in the present invention refers to a maximum peak in a light wavelength range of 300 nm or more when the absorbance of the photopolymerization initiator is measured in chloroform. When the photopolymerization initiator is a composite system, it shows a peak having a large absorption. Examples of the photopolymerization initiator in the elementary body (B) include a thioxanthone derivative shown below or a composite photopolymerization initiator composed of a compound selected from the following group (a) and a compound selected from the following group (b). However, the present invention is not limited to this.

Group (a): Coumarin derivative or formula (In the formula, Ar ₁ and Ar ₂ are at least one aromatic ring having a substituent having an N atom, or a heterocyclic ring containing at least one N atom, and may be the same or different.) A compound represented by the formula:

Group (b): an S-triazine derivative having at least one trihalomethyl group, or camphorquinone.

Thioxanthone derivatives include thioxanthone, 2
-Chlorothioxanthone, isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, or a compound described in JP-A-55-154970. (Wherein X is hydrogen, halogen, -CN, -OH, -SH, -NH 2, -N
O ₂ , —SO ₃ H, phenylsulfonyl, or an alkylsulfonyl, alkyl, alkoxy, alkylthio, alkylamino, dialkylamino, or —CO-alkyl group having 1 to 4 carbon atoms in each alkyl moiety Or -CO-OR ₁ , -CO-SR ₁ , -CO-N
(R ₁ ) represents a group of (R ₂ ), —CO-piperidyl, —CO-pyrrolidinyl, or —CO-morpholinyl, wherein Z is hydrogen,
1 in each of halogen, -OH, SH, or each alkyl moiety
Represents an alkyl, alkoxy, alkylthio, or dialkylamino group having from 4 to 4 carbon atoms, and Y is-
OR ₁ , —SR ₁ , N (R ₁ ), (R ₂ ), piperidyl, pyrrolidinyl, or morpholine; R ₁ is an alkyl group having 1 to 24 carbon atoms, and 3 to 10 carbon atoms; an alkoxyalkyl group having atoms, cycloalkyl group of C ₅ to C _6, a phenyl group, a naphthyl group, - (CH ₂₎ m-phenyl or - a _{(CH 2 CH 2 O) n} -CH 3 of radical, R ₂ means one of the residues of hydrogen or R _1, m is n is 2 to 10 the number of 1 or 2
Of integers, at least one of its time X and Z, In the group 4 position of the -CO-Y, and not hydrogen when Y is meant -OCH _3. ) The compound represented by these.

The sensitivity of the titoxanthone derivative is improved when used in combination with the amines. The thioxanthone derivative is used for the following polymerizable compound having an unsaturated double bond.
It can be used in the range of 1: 5 to about 1: 1000, preferably about 1:10 to about 1: 100.

Examples of the compound of the group (a) include compounds represented by the formula (III) and having an absorption maximum of 360 nm to 430 nm.

As a specific example, And so on.

The coumarin derivatives of the group (a) include 4-methyl-7-hydroxycoumarin, 4-methyl-7-dimethylaminocoumarin, 4-methyl-7-ethylamino-coumarin, and 4-methylpepyridino [3,2-g]. Coumarin, 4
-Methyl-7-cyclohexylaminocoumarin, 4-trifluoromethyl-7-diethylaminocoumarin, 3-
Phenyl-4-methyl-7-diethylaminocoumarin,
3- (2'-N-methylbenzimidazoyl) -7-diethylaminocoumarin, 4-trifluoromethyl-6-
Methyl-7-ethylaminocoumarin, 3-phenyl-7
-Aminocoumarin, cyclopenta [C] julolidino [9,10-e] -11H-pyran-11-one, 10-trifluoromethylduloridino [9,10-e] -11H-pyran-11
-One, 9-methyljulolidino [9,10e] -11H-pyran-11-one, 4-trifluoromethyl-7-aminocoumarin, 9-trifluoromethyljulolidino [9,10-
e] -11H-pyran-11-one, 4-trifluoromethyl-N-ethylpiperidino [3,2-g] coumarin, or a coumarin derivative described in JP-B-59-42684, having an absorption maximum of about 360 nm to about 430 nm. Compounds in the range are included.

Specifically, 3,3'-carbonylbis (7-methoxycoumarin), 5,7-dimethoxy3,3-carbonylbiscoumarin, 5,7,7'-trimethoxy-3,3'-carbonylbiscoumarin, 3,3'-carbonylbis (5,7-dimethoxycoumarin), 3-benzoyl-7-diethylaminocoumarin, 7-diethylamino-3- (4-dimethylaminobenzoyl) coumarin, 7-diethylaminothienoylcoumarin and the like. .

Further, the amines may be added to a photopolymerization initiator composed of a compound selected from the group (a) and a compound selected from the group (b).

Examples of the S-triazine derivative having at least one trihalomethyl group in the group (b) include 2-phenyl-4,6-bis (trichloromethyl) -S-triazine,
2 (p-chlorophenyl) -4,6-bis (trichloromethyl) -S-triazine, 2- (p-tolyl) -4,6-
Bis (trichloromethyl) -S-triazine, 2- (p
-Methoxyphenyl) -4,6-bis (trichloromethyl) -S-triazine, 2- (2 ', 4'-dichlorophenyl) -4,6-bis (trichloromethyl) -S-triazine, 2,4 , 6-Tris (trichloromethyl) -S-triazine, 2-methyl-4,6-bis (trichloromethyl)
-S-triazine, 2-n-nonyl-4,6-bis (trichloromethyl) -S-triazine, 2- (α, α, β-
Trichloroethyl) -4,6-bis (trichloromethyl)
-S-triazine, 2-styryl-4,6-bis (trichloromethyl) -S-triazine, 2- (p-methylstyryl) -4,6-bis (trichloromethyl) -S-triazine, 2- (p -Methoxystyryl) -4,6-bis (trichloromethyl) -S-triazine, 2- (p-methoxystyryl) -4-amino-6-trichloromethyl-S
-Triazine, 2-methyl-4,6-bis (tribromomethyl) -S-triazine, 2,4,6-tris (tribromomethyl) -S-triazine, 2,4,6-tris (dibromomethyl)- S-triazine, 2-amino-4-methyl-
6-Tribromomethyl-S-triazine, 2-methoxy-4-methyl-6-trichloromethyl-S-triazine and the like can be mentioned.

Further, the photopolymerization initiator comprising a combination of compounds selected from the groups (a) and (b) is preferably about 1: 5 to about 1: 1000 with respect to the polymerizable compound having an unsaturated double bond described below. Used in the range of about 1:10 to about 1: 100. Compounds of group (a) and compounds of group (b) are used in a range from about 1:10 to about 10: 1.

Next, the photopolymerization initiator in the elementary body (C) will be described. The photopolymerization initiator is a compound having an absorption maximum at 430 nm or more. The absorption maximum of the photopolymerization initiator is preferably 70
It is 0 nm or less, and further 600 nm or less. When the photopolymerization initiator is a composite system, it shows a peak having a large absorption.

Examples of such a photopolymerization initiator include a composite photopolymerization initiator comprising a compound selected from the following group (c) and a compound selected from the above group (b), but the present invention is not limited thereto. It is not something to be done.

(C) Group: Compounds of the following general formula (V) and coumarin derivatives having an absorption maximum of about 430 nm or more.

Specific examples of (wherein Ar _1, Ar ₂ is the same as Ar _1, Ar ₂ in the general formula (III).) General formula (V), Examples of the coumarin derivatives of the group (c) include 3- (2'-benzothiazolyl) 7-diethylaminocoumarin and compounds having an absorption maximum of about 430 nm or more among the coumarin derivatives described in JP-B-59-42684.

Specifically, 7-diethylamino-3,3'-carbonylbiscoumarin, 3,3'-carbonylbis (7-diethylaminocoumarin), 9- (7-diethylamino-3-
Kumarinoyl) -1,2,4,5-tetrahydro 3H, 6H, 10H
[1] Benzopyrano [9,9a, 1-gh] quinolazin-10-one, 9,9′-carbonylbis (1,2,4,5-tetrahydro-
3H, 6H, 10H [1] benzopyrano [9,9a, 1-gh] quinolazin-10-one), 10-acetylgerolizino [9,10-
e] -11H-pyran-11-one, 10-cyanogerolizino [9,10-e] -11H-pyran-11-one, 10-carboxydurolidino [9,10-e] -11H-pyran −11-on and the like.

The amines may be added to a photopolymerization initiator comprising a compound selected from the group (c) and a compound selected from the group (b).

Further, the photopolymerization initiator comprising a combination of compounds selected from the groups (c) and (b) is preferably about 1: 5 to about 1: 1000 with respect to a polymerizable compound having an unsaturated double bond described below. Used in the range of about 1:10 to about 1: 100. Compounds of group (c) and compounds of group (b) are used in a range from about 1:10 to about 10: 1.

The polymerizable compound having an unsaturated double bond in the element bodies (A), (B) and (C) is a compound having at least one unsaturated double bond in its chemical structure.
It has a chemical form such as a monomer, oligomer, or polymer. Examples include monomers such as methyl acrylate, methyl methacrylate, acrylonitrile, and acrylamide; and unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, hisocrotanic acid, and maleic acid, and ethylene glycol and triethylene. Esters with aliphatic polyhydric polyol compounds such as glycol, tetraethylene glycol, trimethylolpropane, 1,3-butanediol, pentaerythritol, dipentaerythol, and polyisocyanate (reacted with polyols if necessary) And urethane acrylates and urethane methacrylates synthesized by the polyaddition reaction of alcohols and amines containing unsaturated double bonds, and the addition reaction of epoxy resin with acrylic acid or methacrylic acid. Epoxy acrylates and polyester acrylates being synthesized, such as spin acrylates and the like.

Further, as the polymer, a polymer represented by a acryl group, a methacryl group, a cinnamoyl group, a cinnamylidene acetyl group, a furyl acryloyl group or the like having a skeleton of a polyalkyl, polyether, polyester, polyurethane or the like in a main chain. Examples include those into which a reactive group is introduced, but the present invention is not limited thereto.

Further, the above-mentioned photopolymerization initiator and the bases (A), (B), and (C) each having a polymerizable compound having an unsaturated double bond may further include a known binder, colorant, UV absorber, and plasticizer. If necessary, additives such as a thermal polymerization inhibitor can be contained.

Any binder may be used as long as it is an organic high molecular polymer compatible with a monomer, oligomer or polymer having an unsaturated double bond. Examples of such organic high-molecular polymers include polymethyl acrylates, polyacrylic acid alkyl esters such as polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylic acid alkyl esters such as polyethyl methacrylate, and methacrylic acid copolymers and acrylics. Acid copolymers, maleic acid copolymers, or chlorinated polyethylene, chlorinated polyolefins such as chlorinated polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile or copolymers thereof, and further, polyvinyl alkyl ether, polyethylene, polypropylene , Polystyrene polyamide, polyurethane, chlorinated rubber, cellulose derivative, polyvinyl alcohol, polyvinyl pyrrolidone, etc., but the present invention is not limited thereto.

These polymers may be used alone or as a mixture of two or more at an appropriate ratio. Also compatible as a binder,
Not only incompatible but also waxes may be used. These polymers can be incorporated in any amount in the overall composition.

The colorant is a component contained for forming an optically recognizable image, and various contents and dyes are appropriately used. Examples of such contents and dyes include carbon black, graphite, molybdenum red, inorganic pigments such as red bengal, Hansa Yellow, Benzidine Yellow, Brilliant Carmine 6B, Lake Red C, Permanent Red F5R, Phthalocyanine Blue, and Victoria Blue. Organic pigments such as flakes and fat sky blue; and colorants such as leuco dyes and phthalocyanine dyes.

Further, it may be used as a color former which reacts with a color developer after image formation to be colored. The amount of the coloring agent is preferably from 0.1 to 30% by weight in the whole composition.

Examples of the UV absorber include benzophenone-based, salicylate-based, benzotriazole-based, and oxalic acid alinide-based compounds. In addition, by appropriately combining the UV absorber with the photopolymerization initiator, the photosensitive wavelength range of the photopolymerization initiator can be narrowed, and the overlap of the photosensitive wavelength ranges of the photopolymerization initiator can be further reduced.

Examples of the plasticizer include phthalate esters such as dimethyl phthalate and diethyl phthalate, dimethyl glycol phthalate, glycol esters such as methyl phthalethyl glycolate, phosphate esters such as triphenyl phosphate, dioctyl adipate, and dityl azelate. And aliphatic dibasic acid esters such as dibutyl malate.

As thermal polymerization inhibitors, p-methoxyphenol, hydroquinone, t-butylcatechol cuprous chloride, 2,6-
Di-t-butyl-p-cresol, organic acid copper and the like. Next, the elements (A), (B) and (C) composed of the above-mentioned components
Has a particle size of about 3 to about 50 μm, preferably 7 to
15 μm particle element, element (A) (B)
Even if (C) is liquid or solid, the particle size is about 3 to about 50μ.
The recording medium is physically and chemically bound as a microcapsule having a diameter of preferably 7 to 15 μm on a support. The average particle size of the element bodies (A), (B) and (C) is preferably about 10 μm.

When the microcapsules are bound on the support with an adhesive, the binder may be an epoxy adhesive, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyester, urethane, acrylic, urethane acrylic, ethylene-acetic acid. A vinyl copolymer adhesive is preferably used.

Here, when the element bodies (A), (B), and (C) are formed into particles and supported on a support, an oxygen prevention layer such as a transparent support may be further provided in order to prevent the photopolymerization from being damaged by oxygen. desirable.

As the method of microencapsulation, any conventionally known method can be applied, for example, a simple coacervation method, a complex coacervation method, an interfacial polymerization method, an in-situ polymerization method, an interfacial precipitation method, a phase separation method, a spray method. A drying method, an air suspension coating method, a mechanochemical method and the like are used.

As the support, polyester, polycarbonate,
Triacetyl cellulose, nylon polyimide, polyethylene terephthalate, aluminum and the like,
These may be in the form of a film, plate, drum, or sphere.

The recording medium of the present invention can be used for the image forming method described in the aforementioned US Pat. No. 4,399,209. Here, a particularly preferable image forming method using the recording medium of the present invention will be described. This image forming method is disclosed in Japanese Patent Application Laid-Open No. Sho 62-1741 by the present applicant.
No. 95, the recording medium of the present invention is provided with a plurality of energies including light corresponding to the image recording information, and at least one or more energies different from the energy under the conditions to be applied Is applied to change the transfer characteristics. This transfer characteristic is arbitrarily determined according to the type of the transfer recording medium to be used. For example, in the case of a transfer recording medium that transfers a transferred image in a heat-fused state, the melting temperature, the softening temperature, or the glass transition point In the case of a transfer recording medium for transferring a transferred image in an adhesive state or a state of being permeable to a transfer-receiving medium, the viscosity is the same at the same temperature. A plurality of types of energy used to form a transfer image are also arbitrarily determined depending on the type of transfer recording medium to be used. For example, photoenergy, heat, pressure, and the like are used in an appropriate combination.
As a particularly preferable example of these physical property changes, a method in which a transferred image is transferred in an adhesive state or a state of being permeable to a medium to be transferred is preferable. That is, the transfer image forming energy for obtaining a transfer image corresponding to the recorded information is the lowest among the above methods, and an image amplification effect is obtained at the time of image formation by transfer, so that the recording speed is greatly improved.

A preferred image forming method for subjecting the recording medium of the present invention to image formation will be described. For the understanding, an example using a recording medium on which a transfer image is formed by light and heat energy will be described with reference to FIGS. 1a to 1d.

The time axes (horizontal axes) of the respective graphs in FIGS. 1a to 1d correspond to each other. In addition, the transfer recording layer has a body (A)
(B) and (C) are included. Figure 1a shows a state of the rise of the surface temperature of the heating means and the subsequent temperature drop in the case where is between the heat generating driving the heating means of the time 0 to t ₃ such as a thermal head. The transfer recording medium pressed against the heating means shows a temperature change as shown in FIG. 1b with the temperature change of the heating means. That is, the temperature rise with a time delay t _1, likewise temperature after reaching the maximum temperature lags t ₃ to time t ₄ is lowered. This recording layer has a softening temperature Ts, and sharply softens in a temperature range above Ts and the viscosity decreases.
This is shown by curve A in FIG. 1c. Time t ₄ until the viscosity drop at time t ₂ reaches the maximum temperature after reaching Ts is followed, again the viscosity with the temperature drop indicating the increased time t ₆ up to rapid viscosity increase drops to Ts. In this case, the transfer recording layer has basically not undergone any change in physical properties before the heating, and the temperature Ts
Heating above results in a decrease in viscosity as described above.

Therefore, if the transfer recording layer is heated to a temperature necessary for transfer (Ts) by pressing against the medium to be transferred, the transfer recording layer is transferred for the same reason as the transfer mechanism of the conventional thermal transfer recording. In the case of the present invention, as shown in FIG.
If at the same time light irradiation and heating from time t _2, the the transfer recording layer is a photopolymerization initiator contained in the softened transfer recording layer temperature is activated is increased by sufficient to increase the reaction rate Since the probability that the polymerizable monomer is polymerized is greatly increased, the curing proceeds rapidly.

When heating and light irradiation are performed simultaneously, the transfer recording layer behaves as shown by the curve B in FIG. 1c. The softening temperature as the reaction progresses is changed from elevated Ts at time t ₅ the crosslinking is completed in T's. This is shown in FIG. 1d. Therefore, when heating is performed in the next transfer step, there is a difference in properties between a portion changed to T's and a portion not changed. Accordingly, the transfer start temperature Ta, which is the temperature at which the transfer recording layer starts transferring, also changes to T'a. So, for example, Ta <
If heating is performed to Tr that satisfies Tr <T'a, only the portion where the softening temperature does not rise is transferred to the transfer-receiving medium. Although it depends on the temperature stability accuracy of the transfer step, T's-Ts at this time is preferably about 20 ° C. or more. Particularly, the temperature is preferably 40 ° C. or higher. In this way, a transferred image can be formed by controlling heating or non-heating in accordance with an image signal and simultaneously irradiating light.

The transfer start temperature in the present invention is measured as follows.

6 μm thick transfer recording coated on polyethylene terephthalate (PET) film and transfer recording with the surface smoothness (Beck smoothness) used as the medium to be transferred 50 to 200 seconds and 0.2 mm thick high quality paper facing The medium and the high-quality paper are sandwiched between the following two rolls and transported at a speed of 2.5 mm / sec.
The first of the two rolls is arranged on the transfer recording medium side, is a 300 W halogen heater built-in iron roll, and has a diameter of 40 mm. The second roll on the high-quality paper is 40 mm in diameter.
The surface of the iron roll is coated with a 0.5 mm thick fluororubber, and the two rolls face each other at a linear pressure of 4 kg / cm. The surface of the first roll is detected by a thermistor, and the halogen heater is controlled so as to maintain a predetermined temperature. Four seconds after passing between the two rolls, while keeping the high-quality paper flat, the transfer recording medium is pulled at an approximately 90 ° angle at the same transport speed as the rolls, and the transfer recording medium and the high-quality paper are separated. ,
Observe whether the transfer recording layer is transferred to high quality paper. The temperature at which the optical density of the transferred image is saturated is measured while gradually increasing the surface temperature of the heat roll (first roll) (heating rate is 10 ° C./MIN or less), and the transfer start temperature is known.

Here, the change in the transfer characteristics is described as a change in the softening temperature Ts. However, the recording medium of the present invention obtains a recorded image in a subsequent transfer step, so that the adhesion state to the recording medium or the permeability. It is only necessary that the state changes, and adaptation is possible without a clear change in Ts. As understood here, when the recording medium of the present invention is used in the above-described image forming method, the element in the recording medium needs to be solid at least at room temperature.

As a plurality of types of energy used for forming a transfer image, a combination of energy selected from electricity, ultrasonic waves, and pressure that can be converted into light and heat is preferable in terms of energy efficiency.

Further, a multicolor image is formed by using the recording medium of the present invention in the above image forming method and using a light source in accordance with the photosensitive wavelength range of each photopolymerization initiator of the element bodies (A), (B) and (C). No. 2a
FIG. 2 to FIG. 2d are partial views showing the relationship between the transfer recording medium of the present invention and the thermal head, in which the thermal energy modulated according to the recording signal is selected according to the color tone of the image forming element whose transfer characteristics are to be changed. It is provided together with the light energy of the wavelength. "Modulation" refers to changing the position at which energy is applied according to the image signal. "Together" refers to the case where light energy and heat energy are applied simultaneously, or light energy and heat energy are applied separately. May be used.

The multicolor transfer recording medium 1 of the present invention is configured by providing a transfer recording layer 1a on a base film 1b. Transfer recording layer 1a
Is a distribution layer of the elementary bodies (A), (B), and (C), and exhibits a multicolor tone.

For example, in the embodiment shown in FIGS. 2a to 2d, the element bodies (A), (B), and (C) contain any of the magenta (M), cyan (C), and yellow (Y) coloring materials. Have been. However, the color material contained in each of the image forming elements (A), (B), and (C) is not limited to magenta, cyan, and yellow, and any color material may be used depending on the application. .

Since each of the image forming element bodies (A), (B), and (C) has a different photosensitive wavelength range, for example, the element body (A) contains a magenta coloring material, and heat and wavelength λ (M) When light is applied, the polymerization proceeds and cures. Similarly, the body (B) contains a cyan coloring material to give heat and light of wavelength λ (C), and the body (C) contains a yellow coloring material to give heat and light of wavelength λ (Y). As a result, the polymerization proceeds and is cured. The cured image forming element bodies (A), (B), and (C) do not decrease in viscosity or have no tackiness even when heated in the next transfer step, so that they are not transferred to a transfer-receiving medium. Heat and light are applied according to the recorded information.

Next, a specific example of an image forming method using the recording medium of the present invention will be described. First, the transfer recording medium 1 is overlaid on the heating element 3b of the thermal head 3a, and irradiated with light so as to cover the entire heating section. The light to be irradiated is the image forming body (A) (B) (C)
Are sequentially irradiated with the wavelength at which the. For example, when the image forming element bodies (A), (B), and (C) are colored in any of magenta, cyan, and yellow, the wavelengths λ (M) and λ
(C) and light of λ (Y) are sequentially irradiated.

That is, first, light of the wavelength λ (M) is irradiated from the transfer recording layer 1a side of the transfer recording medium 1 and, for example, the heating elements 3b-b and 3b-c of the thermal head 3a generate heat. Heat and wavelength λ of the contained image forming body
The image forming body (the hatched portion in FIG. 2a; hereinafter, the cured image forming body is indicated by hatching) to which both of the light of (M) are added is cured.

Next, as shown in FIG. 2b, the wavelength λ is applied to the transfer recording layer 1a.
By irradiating the light of (C) and causing the heating elements 3b-a, 3b-b, and 3b-c to generate heat, heat and light of the wavelength λ (C) of the image forming body containing the cyan coloring material are obtained. Is hardened. Further, as shown in FIG. 2c, light of wavelength λ (Y) is irradiated and the heating elements 3b-c, 3b-d
Of the image forming body containing the yellow color material that causes heat to be generated, the image forming body to which the heat and the light of the wavelength λ (Y) are applied is cured, and finally the image forming body that is not cured A transfer image is formed on the transfer recording layer 1a. In the next transfer step, this transferred image is transferred to a transfer-receiving medium such as a recording paper 8 as shown in FIG. 2d.
Is transferred to

In the transfer step, the transfer recording medium on which the transfer image is formed is brought into contact with the transfer medium, and heated from the transfer recording medium or the transfer medium side to selectively transfer the transfer image to the transfer medium to form an image. I do. Therefore, the heating temperature at this time is determined so that only the transfer image is selectively transferred in the transfer step.
It is also effective to apply pressure at the same time for efficient transfer. Pressurization is particularly effective when a medium to be transferred having a low surface smoothness is used. When the physical property that governs the transfer characteristics is the viscosity at room temperature, transfer can be performed only by applying pressure.

Heating in the transfer step is suitable for obtaining a stable multicolor image which is stable and excellent in storability.

In the embodiment described above with reference to FIGS. 2a to 2d, the method of irradiating light to the entire heat generating portion of the thermal head to selectively heat the heat generating elements of the thermal head to form an image has been described. Heat a part of the recording medium uniformly (2a
In the case of the thermal head shown in the drawing, all the heating elements are heated), and by selectively performing light irradiation, a multicolor image can be similarly formed. That is, light energy having a wavelength selected according to the color tone of the image forming element that is modulated according to the recording signal and whose physical property that governs the transfer characteristics is to be changed may be applied together with the heat energy.

As described above, in the recording medium of the present invention, the photopolymerization initiator in the element (A) constituting the recording layer has the following general formula (I) Wherein R ₁ is an alkyl group having 1 to 6 carbon atoms or a phenyl group which may have a substituent, and R ₂ is a phenyl group which may have a substituent. The absorption maximum of the photopolymerization initiator in the body (B) is in the range of 360 to 430 nm, and the absorption maximum of the photopolymerization initiator in the elementary body (C) is 430n.
m or more, so that when the recording medium of the present invention is used in a multicolor image recording method, a clear multicolor image with less overlapping of the sensitive wavelength ranges is obtained, and a bandpass filter or the like is obtained. Even if light of a very narrow wavelength range is not irradiated with a filter having a low transparency, a sufficiently clear multicolor image can be formed even if a light source such as a fluorescent lamp having a different emission wavelength range is used as it is.

Examples of the present invention will be described below. Here, a method of forming a multicolor image using the above-described light energy and heat energy will be described.

Example 1) 100 g of water and 26 g of isobutylene-maleic anhydride copolymer (20.6%) (Kureha Chemical Co., Ltd.) were mixed, and 3.1 g of pectin was added thereto, followed by stirring for 20 minutes. The pH was then adjusted to 4.0 with a 20% sulfuric acid solution and 0.2 g of quadrol (BASF
Was added. While stirring this at 3000 rpm with a homomixer, a solution in which 20 g of the components shown in Table 1 were dissolved in 30 g of chloroform was added over 10 to 15 seconds, and emulsification was performed for 10 minutes as it was.

The emulsion was transferred to a 500 ml beaker, and stirring was continued for 1 to 2 hours with a stirring blade to distill off the solvent.

Next, 8.3 g of urea solution (50 wt%), 0.4 g of resorcinol dissolved in 5 g of water, 10.7 g of formalin (37%) and 10 ml
0.6 g of ammonium sulphate dissolved in water was added at 2 minute intervals.

After the temperature was raised to 60 ° C. and stirring was continued for 3 hours, the temperature was lowered and the pH was adjusted to 2.0 with a 20% sodium hydroxide solution. The capsule solution was filtered, washed twice with 1000 ml of water, and dried to obtain a microcapsule-shaped image forming element (A).
Similarly, a base (B) was obtained from the components in Table 2 and a base (C) was obtained from the components in Table 3. As shown in FIG. 10, the cores 1c, 1d, and 1e of the image forming
The microcapsules coated with a particle having a particle size of 7 to 15 μm and an average particle size of 10 μm.

Next, a 6 μm thick PET coated with a toluene solution of a polyester adhesive Polyester LP-220 as 1 g of the adhesive.
Image-forming body (A) sufficiently mixed on film
(B) (C) was sprinkled excessively. The thickness of 1 g of adhesive is
After drying, the thickness was adjusted to about 1 μm. Thereafter, an air gun is sprayed on the image forming elements (A), (B), and (C) on the PET film to remove the image forming elements not in contact with 1 g of the adhesive, and further with a pressure of 1 kg / cm ² . The recording medium of the present invention was produced by passing the above PET film between two rollers (surface temperature: 110 ° C.) in contact with each other.

Photoinitiator 7-acetoxy-3- shown in Table 1
Benzoyl coumarin has the light absorption characteristics shown in FIG. 9, the photopolymerization initiator 2-chlorothioxanthone shown in Table 2 has the light absorption characteristics shown in FIG. 10, and the photopolymerization initiator 3,3'-carbonylbis ( 7-diethylamino-coumarin) shows the light absorption characteristics shown in FIG. 11, respectively. Where the prime field (A)
(B) and (C) show magenta, cyan, and yellow, respectively, during image formation.

Next, a recording apparatus using the recording medium of the present invention will be described with reference to FIGS. 3 (A) and 3 (B).

In the figure, reference numeral 1 denotes a transfer recording medium of the present invention in the form of a long sheet, which is wound in a roll shape and is detachably incorporated in the apparatus main body M as a supply roll 2. That is, the supply roll 2 is a rotatable shaft provided on the apparatus main body M.
2a is removably loaded.

Therefore, first, the leading end of the transfer recording medium 1 passes through the supply roller 2, the guide roller 12a, the thermal head 3a, and the guide roller 12b, and from between the transfer roller 4a and the pressure roller 4b by the peeling roller 5, the guide rollers 12c and 12d. The deflection is made to the take-up roll 6, and the leading end thereof is locked to the take-up roll 6 by means such as a gripper (not shown). Thereafter, the take-up roll 6 is driven by known driving means.
By rotating the transfer roller 4a while applying a torque in the direction of arrow c, the transfer recording medium 1 is fed out in the direction of arrow a, and is sequentially wound on the peripheral surface of the take-up roll 6.

During the winding, a constant back tension is applied to the supply roll 2 by, for example, a hysteresis brake (not shown), and the transfer recording medium 1 is transferred to the thermal head 3a by the tension and the guide rollers 12a and 12b. And at a constant pressure and at a constant angle.

A with a width of 0.2 mm and 8 dots / mm for the thermal head 3a
The base material 1b of the transfer recording medium 1 uses a line type of -4 size, in which the rows of the heating elements 3b are arranged at the edges.
The transfer recording medium 1 is pressed by the heat generating element 3b by the tension of the transfer recording medium 1.

On the other hand, on the side of the transfer recording layer 1a facing the recording head 3a, a light irradiation means is provided. As the light irradiation means, the emission wavelength ranges are different from each other, and the element bodies (A) and (B)
(C) three fluorescent lamps (for example, Toshiba FL10A70E35 / 33T15 (peak wavelength 33)
5nm), Toshiba FL10A70E39 / 33T15 (peak wavelength 390nm),
Toshiba FL10A70B / 33T15 (450 nm peak wavelength) can be used.

The following light irradiation means may be used.

As shown in FIGS. 3A and 3B, the spectral transmittance has, for example, the characteristics shown in FIG. A rotating body 3c made of a 2 mm thick glass cylinder (manufactured by SCHOTT, West Germany, product name DURAN50) is rotatably supported by three pairs of rollers 3d, 3e, 3f, and the rollers 3d are driven and rotated by a motor. Thus, it is configured to rotate at a constant speed.

Three types of fluorescent lamps 100, 101, 102 are provided on the inner surface of the rotating body 3c.
Are applied by 120 degrees (in three equal parts) in the circumferential direction. The fluorescent lamps 100, 101, and 102 are excited by light from a light source (for example, a germicidal lamp GL-20 manufactured by Toshiba Corporation) 3g disposed in the rotating body 3c to emit a fluorescent lamp.

In the present embodiment, BaMgAl ₁₆ O ₂₇
Eu, ie, eurobium-activated barium magnesium aluminate, was used as the main component of the fluorescent lamp 101 (Sr, Mg) ₂ P ₂ O ₇
Eu, ie, strontium magnesium pyrophosphate activated with europium, and Ca (P
O ₄ ) ₂ · T1, that is, thallium-activated calcium phosphate was used.

As can be seen from FIG. 5, the peak wavelength of each phosphor is within the range of 300 to 360 mm, within the range of 360 to 430 nm, and 430, respectively.
Exists in the range of nm600 nm. For example, thallium-activated calcium phosphate is at 335 nm (graph (102)), and europium-activated strontium magnesium pyrophosphate is
395 nm (graph (101)) and europium-activated barium magnesium aluminate at 453 nm (graph (10
0)) each have a peak wavelength.

The light emitted from the phosphors 100, 101, and 102 is applied to the transfer recording layer 1a through a slit 3i (width of the slit is, for example, 0.5 mm) formed in the light shielding plate 3b.

Therefore, while rotating the rotating body 3c, when light is irradiated from the light source 3g, the phosphors 100, 101, and 102 are sequentially excited and emit light, and light having different spectral distributions is sequentially irradiated to the transfer recording layer 1a through the slit 3i. Become.

Here, a control configuration for controlling the rotation speed and phase of the rotating body 3c will be described.

As shown in FIG. 3 (B), the rotating body 3c has a large number of light-shielding portions 14a formed in a stripe shape at regular intervals on the circumference near the end portion, and one of the light-shielding portions 14a 'is the other. Shading part 1
It is formed wider than 4a. Further, a light emitting member 14b such as an LED is disposed inside the rotating body 3c so as to sandwich the light shielding portion 14a, and a light receiving member 14c such as a photodiode is disposed outside the rotating body 3c.

With the above configuration, the signal obtained from the light receiving member 14c while the rotating body 3c is rotating at a constant speed is as shown in FIG. 6 (A). The level "low" shown in FIG. 6 (A) is a state in which light from the light emitting member 14b is transmitted through the rotating body 3c and received by the light receiving member 14c, and the level "high" is shown.
Is a state where light is shielded by the light shielding member 14a and is not received by the light receiving member 14c. Accordingly, the frequency of the rising edge of this signal appears as the rotation speed of the rotator 3c. By detecting and controlling this, the rotation speed of the rotator 3c can be controlled.

Next, in the phase control, the integral waveform shown in FIG. 6A is obtained as shown in FIG. 6B. Since one of the light shielding portions 14a (14a ') is wide, the integral waveform is integrated. The peak value increases. Therefore, it is preferable to create and control a yellow line synchronizing signal, a magenta line synchronizing signal, a cyan line synchronizing signal, and other signals, which will be described later, based on the timing at which the peak value becomes high.

Next, the transfer unit 4 will be described. The transfer unit 4 is disposed downstream of the recording unit 3 in the transport direction of the transfer recording medium 1 and is driven to rotate in the direction of arrow b as shown in FIGS. 3A and 3B. The transfer roller 4a is configured by a pressure roller 4b pressed against the transfer roller 4a.

The transfer roller 4a is composed of an aluminum roller whose surface is coated with silicone rubber having a thickness of 1 mm and a hardness of 70 degrees,
And the built-in 800W halogen heater 4c
It is configured to be kept at 90-100 ° C.

The pressure roller 4b is made of an aluminum roller coated with silicon rubber having a hardness of 70 degrees and having a thickness of 1 mm, and the pressing force with the transfer roller 4a is reduced to 6 to 7 kgf / cm by pressing means (not shown) such as a spring. Is set.

Further, recording paper 8 as a recording medium loaded in the cassette 7
Is fed by a feed roller 9 and a pair of registration rollers 10a and 10b, the leading edge of the recording paper 8 is detected by a registration sensor 26 including an LED 26a and a phototransistor 26b, and the feeding timing is controlled, whereby the transfer recording is performed. It is configured to be fed to the transfer unit 4 synchronously so as to overlap the image area of the medium 1.

Next, a recording method performed by using the recording apparatus configured as described above will be described.

In this embodiment, an example is shown in which heat is selectively applied in accordance with an image signal and light is applied uniformly.

The transfer recording medium 1 is supplied by driving the motor.
Are sequentially applied to the recording section 3, and when light and heat are applied to the transfer recording layer 1a of the transfer recording medium 1 in accordance with an image signal, an image is formed. The transfer recording layer 1a has such a property that when light and heat of a predetermined wavelength are applied, the softening point temperature increases, that is, the transfer characteristics change irreversibly, and the transfer recording layer 1a is not transferred to the recording paper 8. .

Therefore, as shown in the timing chart of FIG.
At the time of magenta color recording, a portion corresponding to the magenta complementary color of the image signal, that is, the portion corresponding to the green image signal in the heating element array 3b is used.
The energization is performed for ms, and at the same time, the light source 3g is turned on for 25 ms.
At this time, the transfer recording layer 1a located at the slit 3i has a rotating body.
The phosphor 102 of 3c is facing, and the graph (102) of FIG.
The light energy having the spectral distribution shown in (1) is uniformly applied to the transfer recording layer 1a.

Next, at the time of cyan recording, 50 ms after the start of energization to the heating element in the magenta recording, the energization of 20 ms was performed to the portion corresponding to the complementary color of cyan, that is, the red image signal in the heating element row 3b. And light source 3g at the same time 25g
Lights for ms. At this time, the transfer recording layer located at the slit 3i
The phosphor 101 of the rotating body 3c is opposed to 1a, and the light energy of the spectral distribution shown in the graph 101 of FIG.
It is uniformly assigned to a.

Next, at the time of yellow recording, 50 ms after the start of energization to the heating element in the cyan recording, 15 ms is applied to a portion corresponding to a complementary color of yellow, that is, a blue image signal in the transmitting element array 3b. Energize, and at the same time, light source 3g
Lights for 20 ms. At this time, the phosphor 100 of the rotating body 3c is opposed to the transfer recording layer 1a located in the slit 3i, and the light energy of the spectral distribution shown in the graph 100 of FIG. 5 is uniformly applied to the transfer recording layer 1a. You.

In the manner described above, the transfer image is formed on the transfer recording layer 1a by controlling the heat generation of the recording head 3a, the rotation of the rotating body 3c, and the lighting of the light source 3g in accordance with the image signals of the complementary colors of yellow, magenta, and cyan. The transfer recording medium 1 is conveyed in synchronization with a repetition cycle of 150 ms / line.

Next, when a recorded image was formed on plain paper having a surface smoothness in the range of 10 to 30 seconds, a high-quality multicolor image with good fixability could be formed in one shot.

Next, an image of only the magenta color on the recording medium 1 described above,
An image of only cyan and an image of only yellow are respectively formed by solid printing, and the optical density of each color is determined by MAVSV RD.
Measured using a -154 optical densitometer. As a result, the maximum values of fog (white portion) of the magenta image 1.40, the cyan image 1.35, and the yellow image 1.35 were magenta 0.02, cyan 0.03, and yellow 0.03.

Examples 2) to 6) Elementary bodies (A) shown in Tables 1 to 3 of Example 1),
A recording medium was produced in the same manner as in Example 1), except that the photopolymerization initiator in (B) and (C) was changed to a combination shown in Table 4 below. These recording media were evaluated in the same manner as in Example 1). The results are shown in Table 4.

In this embodiment, when forming a recorded image, the light irradiation time and the heat application time were changed. As shown in the timing chart of FIG. 12, x,
It is represented by y, z, x ', y', z 'and shown in Table 4 as drawing conditions.

As can be understood from Table 4, the use of the recording medium of the present invention allows the formation of a high-quality multicolor image having a high image density of each color and a low fog because the overlap of the photosensitive wavelength regions of the photopolymerization initiator is small. You.

Example 7) Next, the following experiment was conducted to deepen the understanding of the present invention.

First, a recording medium of the present invention was prepared in the same manner as in Example 1) except that the photopolymerization initiator shown in Table 1 was changed to the photopolymerization initiator shown in Table 5. Subsequently, the recording medium is placed on a hot plate with the PET film facing down, and heated to 100 ° C., and a fluorescent lamp having an emission peak wavelength of 335 nm (FL10A70E3 manufactured by Toshiba) is applied from the transfer layer side.
5 / 33T15).

Next, the recording medium was superimposed on plain paper and passed between the transfer roller 4a and the pressure roller 4b of the apparatus shown in FIG. 3 to transfer the transfer layer onto plain paper.

The image density of the transfer image thus obtained was measured, and the shortest light irradiation time at which the image density became 0.07 or less was determined. The image density was measured using a Macbeth RD-514 optical densitometer.

Next, the fluorescent lamp was set to a light emission peak wavelength of 390 nm (Toshiba FL10A70E3
9 / 33T15) and emission peak wavelength 450nm (FL10A70B manufactured by Toshiba)
/ 33T15) and carried out a similar experiment.
It is shown in the table.

As understood from Table 5, the photopolymerization initiator represented by the general formula (I) shows high sensitivity to lamps having a peak wavelength of 335 nm, and has high sensitivity to lamps having a peak wavelength of 390 nm and 450 nm. The recording medium of the present invention is extremely poor, and a high-quality recorded image with little crosstalk can be obtained.

[Brief description of the drawings]

FIGS. 1a to 1d are views for explaining the principle of transfer image formation when a transfer image is formed by light and heat energy using the recording medium of the present invention, and FIGS. 2a to 2d are recordings of the present invention. FIG. 3A is a diagram for explaining a method for forming a multi-color transfer image using a medium, FIG. 3A is a side view showing an example of the inside of the recording apparatus of the present invention, and FIG. FIG. 3 (A) is a perspective view showing only the inside of the recording apparatus, FIG. 4 is a graph showing an example of light transmission characteristics of glass used for the rotating body 3c shown in FIG. 3, and FIG. 5 is a phosphor. FIG. 6 is a graph showing an example of a signal of a light receiving member for detecting rotation of the rotating body 3c and its integral waveform, FIG. 7 and FIG. 12 are timing charts for applying light and heat, FIG. 8 is a side view showing one example of the recording medium of the present invention, and FIGS. It is. 1: transfer recording medium 1a: recording layer 1b: base film 1c to e: core 1f: shell 1g: adhesive 2: supply roll 2a: rotatable shaft 3: recording unit 3a: thermal head 3b: heating element 3c: rotation Body 3d to f: Roller 3g: Light source 3h: Light shielding plate 3i: Slit 4: Transfer unit 4a: Transfer roller 4b: Pressure roller 4c: Heater 5: Peeling roller 6: Winding roll 7: Cassette 8: Recording paper 9: Feed roller 10a, 10b: registration roller pair 11: discharge tray 12a to 12d: guide roller 13a: discharge roller 13b: 〃14: rotation control unit 14a, 14b ': light shielding unit 14b: light emitting member 14c: light receiving member 26: photo Registration sensor 26a: LED 26b: Phototransistor 100: Phosphor 101: 〃 102: 〃 M: Main unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G03F 7/031 G03F 7/004 B41M 5/38-5/40

Claims (8)

(57) [Claims] 1. A recording medium used for forming a transferred image by applying light and heat energy, wherein a recording layer on a support contains at least a compound having an unsaturated double bond and a photopolymerization initiator. Microcapsules (A), (B)
Wherein the photopolymerization initiator in the microcapsule (A) has the general formula (I) (Wherein, R ₁ is an alkyl group having 1 to 6 carbon atoms, or a phenyl group which may have a substituent, and R ₂ is a phenyl group which may have a substituent). Including the compound in the wavelength range, the absorption maximum of the photopolymerization initiator in the microcapsule (B) is in the wavelength range of 360 to 430 nm, and the absorption maximum of the photopolymerization initiator in the microcapsule (C) is 430 nm or more. It is within the wavelength range, the absorption maximum wavelength of each photopolymerization initiator is different, and the microcapsules (A), (B) and (C) contain colorants or color formers of different colors, respectively. Characteristic recording medium. 2. The recording medium according to claim 1, wherein the microcapsules (A) contain amines. 3. The recording medium according to claim 1, wherein camphorquinone is contained in the microcapsule (A). 4. The recording medium according to claim 1, wherein the photopolymerization initiator in the microcapsule (B) is a thioxanthone derivative. 5. The method according to claim 1, wherein the photopolymerization initiator in the microcapsule (B) comprises a coumarin derivative and a camphorquinone or an S-triazine derivative having at least one trihalomethyl group. recoding media. 6. The photopolymerization initiator in the microcapsule (C) is represented by the following general formula (II): (Wherein Ar _1, Ar ₂ is at least one of which is a heterocyclic ring containing an aromatic ring or at least one N atom having a substituent having N atoms, optionally substituted by one or more Ar ₁ and Ar ₂ are the same And a S-triazine derivative having camphorquinone or at least one trihalomethyl group. 7. The method according to claim 1, wherein the photopolymerization initiator in the microcapsule (C) comprises a coumarin derivative and a camphorquinone or an S-triazine derivative having at least one trihalomethyl group. recoding media. 8. The recording medium according to claim 1, wherein the transfer characteristics of the microcapsules (A), (B) and (C) are changed by applying light and heat.