JPH0281679A - Photosensitive thermal transfer recording material - Google Patents

Abstract

PURPOSE:To obtain a high speed high quality multi-colored image by a method wherein a porous microcapsule having photo-setting resin, photo-induced polymerization initiator, and leuco dye as main components built-in on a base material is used. CONSTITUTION:A porous microcapsule 4 having photosetting resin, photo-induced polymerization initiator, and leuco dye as main components built-in is coated with a binder 3 in which at least two photo-induced polymerization initiators of different photosensitive wavelengths and leuco dyes of different hues are uniformly mixed on a base material 2. When light of wavelength lambda1 to lambda3 is irradiated on a photosensitive thermal transfer recording material 1 according to signals of three primary colors from a CRT or the like, photosetting resin in the microcapsules 4 of cyan, magenta, and yellow is cured according to wavelength to form a latent image. Then, this exposed recording material 1 is piled on a recording sheet 6 coated with a developer 8, and thermal energy is applied to all the surface. Leuco dye is released from the microcapsule 4 of which a non-exposed part is not cured, is colored by reaction on the developer 8, and a multi-colored image of which coloring part 9 is recorded, is recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording material that records an image using light and thermal energy, and in particular to a recording material that records images using light and thermal energy of different wavelengths. The present invention relates to a light- and heat-sensitive transfer recording material for recording images.

[Summary of the invention]

BACKGROUND OF THE INVENTION With the rapid development of the information industry, expectations are increasing for multicolor recording systems that can obtain multicolor images at high speed from information equipment terminals for industrial and office use.

The present invention is a porous microcapsule that encapsulates a photocurable resin, a photopolymerization initiator, and a leuco dye as main components on a support. Using a light and heat sensitive transfer recording material provided with a microcapsule layer consisting of microcapsules, the recording sheet is coated with a color developer that reacts with leuco dye and develops color after being irradiated with multiple light energies of different wavelengths. By applying heat energy for transfer, it is possible to obtain high-quality multicolor images at high speed.

[Conventional technology]

Conventionally, as a method for forming multicolor images by applying photocurable microcapsules, for example, Japanese Patent Application Laid-Open No. 58-17432
．． 59-30537. 61251837, 61-
251838. 62-39844, etc., uses light energy to harden the photocurable resin in the microcapsules to form a latent image, and then applies pressure to destroy the unexposed areas of the microcapsules. A method of releasing an image to form an image is shown.

However, this method has the problem that high pressure is required to destroy the microcapsules, which places a large load on the apparatus. Furthermore, in JP-A No. 62-39845, a photocurable resin in microcapsules is cured using light energy to form a latent image, and then heat is applied to melt the unexposed portions of the microcapsules to form a latent image. A method of forming an image by releasing a facial cleanser is disclosed. However, this method has the problem that the photo-cured microcapsules in the exposed areas are also transferred, resulting in poor image quality.

[Problem to be solved by the invention]

As mentioned above, conventional recording methods require high pressure to destroy the microcapsules, which places a large load on the device, and the photo-cured microcapsules are also transferred, resulting in poor image quality. There was a problem with it being put away.

Therefore, in order to solve these conventional problems, the present invention provides a light- and heat-sensitive transfer recording material that can obtain high-quality multicolor images at high speed by using a plurality of lights of different wavelengths and thermal energy. The purpose is to

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides porous microcapsules containing a photocurable resin, a photopolymerization initiator, and a leuco dye as main components, and the sensitive wavelength of the photopolymerization initiator and the hue of the leuco dye are adjusted. A light- and heat-sensitive transfer recording material was constructed by providing a microcapsule layer consisting of two or more different types of microcapsules on a support.

[Effect]

In the present invention, a light-sensitive and heat-sensitive transfer recording material has such a structure, and after being irradiated with multiple light energies of different wavelengths, a recording sheet coated with a color developer that reacts with a leuco dye to develop color is heated. By applying energy for transfer, it is possible to obtain high-quality multicolor images at high speed.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 shows a schematic diagram of the light and heat sensitive transfer recording material of the present invention. Porous microcapsules 4 containing a photocurable resin, a photopolymerization initiator, and a leuco dye as main components are placed on a support 2, and two or more types of photopolymerization initiators with different photosensitive wavelengths and leuco dyes with different hues are uniformly coated. It is mixed with Binder 3 and applied. Here, the porous microcapsules 4 release their contents due to thermal energy, but do not melt;
Furthermore, the binder 3 prevents the toner from being peeled off and transferred to the recording sheet.

FIG. 2 (al is a diagram showing the exposure state of the light- and heat-sensitive transfer recording material in FIG. 1, and the crest in FIG. 2) is a schematic diagram of light- and heat-sensitive transfer recording of the light- and heat-sensitive transfer recording material in FIG. When the light- and heat-sensitive transfer recording material 1 of the present invention is irradiated with light having wavelengths λ1°λ, , λ, according to the signals of the three primary colors from the three primary colors, it becomes cyan according to each wavelength.

The photocurable resin in the magenta and yellow microcapsules 4 is cured to form a latent image. Next, the exposed light-sensitive and heat-sensitive transfer recording material 1 and the recording sheet 6 coated with the color developer 8 are By applying thermal energy to the entire surface using overlapping heat rolls, etc., leuco dye is released from the uncured microcapsules 4 in the unexposed area, reacts with the color developer 8, develops color, and the colored area 9 is recorded, producing a multicolor image. The image is recorded.

As a method for producing the microcapsules of the present invention, known microencapsulation methods 2 surface modification methods 1 such as core cell basin method, interfacial polymerization method, 1nsitU polymerization method, spray drying method, etc. can be used. In particular, methods for forming porous membranes include interfacial polymerization method and 1 n situ polymerization method.
Polymerization methods are preferred.

The constituent materials of the film of the microcapsules 4 include polyamide, polyester, polyurea, polyurethane 8-urea-formaldehyde resin, melamine-
Examples include formaldehyde resin.

As photocurable resins, trimethylolpropane diacrylate, trimethylolpropane triacrylate,
Hexanediol diacrylate.

Examples include polyethylene glycol diacrylate and acrylamide.

As photopolymerization initiators, benzoin, Michler's ketone,
Examples include benzoquinone, naphthoquinone, fluorenone, and benzoin butyl ether.

Examples of leuco dyes include fluoran-based, triphenylmethane-based, phenothiazine-based, and spiropyran-based dyes, such as crystal violet lactone, 3.3
-bis(P-dimethylaminophenyl)-phthalide,
3,3-bis(P-dimethylaminophenyl)-6-amyphthalide, 3,3-bis(P-dimethylaminophenyl)-6-nidrophthalide, 3-dimethylamino-6-medoxyfluoran, benzoylleuco Examples include methylene blue and rhodamine beta-lactam.

Examples of organic solvents that dissolve leuco dyes include alkylated naphthalenes, alkylated biphenyls, alkylated terphenyls, and chlorinated paraffins.

Polyvinyl alcohol is used as a binder.

Methylcellulose, carboxymethylcellulose.

Styrene-butadiene latex or the like can be used.

Examples of the color developer used in the recording sheet 6 include phenolic compounds such as α-naphthol, β-naphthol, resorcinol, hydroquinone, catechol, and pyrogallol, activated clay, and organic carboxylic acid metal salts.

Next, an example of a method for manufacturing a photosensitive and thermal transfer recording material and a recording sheet will be described.

(Capsule A) 1.4 g of benzoyl leucomethylene blue, 20 g of trimethylolpropane triacrylate, 2 g of benzoin ethyl ether, 5 g of terephthalic acid dichloride.
g was added to 25 g of dissolved diisopropylnaphthalene and dissolved. This solution was mixed with a 3% polyvinyl alcohol aqueous solution and emulsified and dispersed using a homomixer to obtain an average particle size of 8 μm.
A dispersion was obtained. To this dispersion was added an aqueous solution in which 3 g of diethylene triamine and 3 g of sodium carbonate were dissolved in 24 g of water, and after leaving the solution for 24 hours with stirring, a capsule liquid containing benzoylleucomethylene blue and a photocurable resin as the core substance was obtained. .

(Capsule B) 1.4 g of 3-diethylamino-7-chlorofluorane,
20 g of trimethylolpropane triacrylate; 2.
2g of 2-dimethoxysafenylacetophenone was added to 25g of diisopropylnaphthalene in which 5g of terephthalic acid dichloride had been dissolved and dissolved. Add this solution to 3
% polyvinyl alcohol aqueous solution and emulsified and dispersed using a homomixer to obtain a dispersion having an average particle size of 8 μm. Add 3 g of diethylenetriamine and 3 g of sodium carbonate to this dispersion.
was dissolved in 24 g of water and left to stand for 24 hours with stirring to obtain a capsule liquid containing 3-diethylamino-7-chlorofluoran and a photocurable resin as a core material.

(Dispersion liquid) 30 g of bisphenol A was added to 100 g of a 5% polyvinyl alcohol aqueous solution and dispersed in a ball mill for 24 hours.
A dispersion of bisphenol A was obtained.

Capsule A 20g, Capsule 8 obtained as above
20 g was added to 40 g of a 5% polyvinyl alcohol aqueous solution and mixed uniformly to prepare a coating solution. This coating solution was coated onto a polyethylene terephthalate film treated with corona discharge using a wire bar so as to have log/rd (dry weight), and dried to obtain light and heat sensitive transfer recording material 1.

In addition, dispersion fi of bisphenol A +50 g/r
T? 10g/n using wire bar on high quality paper. (It was coated to form a dry weight and dried to obtain a recording sheet 6.

The light-sensitive and heat-sensitive transfer recording material 1 obtained as described above is passed through a spectral filter using a xenon lamp at 250 nm.
After irradiating with 340n light, it is passed through a spectral filter.
Next, the exposed light-sensitive and heat-sensitive transfer recording material 1 and the recording sheet 6 were stacked together and the entire surface was heated using a heat roller, etc., and the area irradiated with 250 nm light turned blue. Because only the microcapsules that develop a color are photocured, a red-colored transfer image is obtained, and the area irradiated with 340 nm light becomes blue because only the microcapsules that develop a red color are photocured. A two-color transfer image consisting of red and blue could be obtained on the recording sheet 6.

〔Effect of the invention〕

As described above, the present invention uses porous microcapsules containing a photocurable resin, a photopolymerization initiator, and a leuco dye as main components on a support. After irradiating a light and heat sensitive transfer recording material with a microcapsule layer consisting of two or more types of microcapsules with different wavelengths, a color developer that reacts with a leuco dye to form a color is applied. By applying thermal energy to the processed recording sheet and transferring it, it is possible to obtain high-quality multicolor images at high speed.

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of the light- and heat-sensitive transfer recording material of the present invention, and FIG. 2+al shows the exposure state of the light- and heat-sensitive transfer recording material of FIG. 1 is a schematic diagram of light and heat sensitive transfer recording of the light and heat sensitive transfer recording material shown in Figure 1. 1... Light and heat sensitive transfer recording material 2... Support 3... Binder 4... Porous microcapsule microcapsule layer Recording Sheet Support Color Developer Color Development Section Applicant Seiko Electronics Industries Co., Ltd.

Claims (3)

[Claims] (1) A light- and heat-sensitive transfer recording material characterized in that a microcapsule layer consisting of microcapsules containing a photocurable resin, a photopolymerization initiator, and a leuco dye as main components is provided on a support. (2) The light and heat sensitive transfer recording material according to claim 1, wherein the microcapsule has a porous film. (3) The microcapsule layer is composed of two or more types of microcapsules having different photopolymerization initiator wavelengths and different leuco dye hues.
The light and heat sensitive transfer recording material described in .