JPS627594A - Transparent transfer recording material for sublimation transfer - Google Patents

Abstract

PURPOSE:To enable an image to be formed with a high dye adsorption rate, particularly, with low energy, image stability to be enhanced and contaminative offset onto other material to be prevented from occurring, by providing a heat-resistant dye- receiving layer on a transparent base of a transparent transfer recording material for sublimation transfer. CONSTITUTION:The transparent dye-receiving layer comprising 20-98pts.wt. of a thermoplastic resin capable of being dyed and 80-2pts.wt. of a compound having two unsaturated bonds in one molecule thereof is provided on either one or both sides of a transparent plastic base in a thickness of, for example, 2-50mum to obtain the transparent transfer recording material for sublimation transfer. A dye ribbon is laid on the dye-receiving layer, a thermal is brought into contact with the back side of the ribbon, and the ribbon is heated by a heat pattern, whereby the dye of the ribbon is sublimed and transferred onto the dye-receiving layer of the recording material. Since the thermoplastic resin is present in the dye-receiving layer, molecules of the resin are enabled to freely move under the heat from the head at the time of forming an image, namely, when the sublimed dye dyes, so that the flying-in dye can be taken into the dye-receivibn layer at a high efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transparent transfer material for sublimation transfer, which is used when obtaining a color image as a projection material for a color slide or an overhead projector (hereinafter referred to as OHP). Involved.

[Summary of the invention]

In the present invention, a transparent dye-receiving layer made of a thermoplastic resin having dye-dyeability and a compound having two or more unsaturated bonds in one molecule is formed on a transparent plastic support to achieve a high dye density. to obtain a stable image.

[Conventional technology]

For example, as a method for creating projection materials in OOP, there is a dry method using an electrostatic recording copying machine, but with this method, it is difficult to obtain a clear printed image and the resolution of the print is low, and with the wet method, the print density is low. In addition, with hot-melt transfer recording methods, it is difficult to maintain the color gradation of prints, making it difficult to produce photographic images.Furthermore, with recording methods such as inkjet and ink pens, the ink generally dries on plastic sheets. Oil-based ink with a high temperature tends to clog the nozzle or pen tip, and it is not possible to produce photographic images.
Photographic techniques that create semi-permanent images physically or chemically are cumbersome and time-consuming, as well as increasing production costs. Furthermore, the screen is dark due to the single deposit of fine silver, and the amount of light transmitted is small, making it unsuitable as an OHP document.

Therefore, a method has been developed in which a heat-sensitive transfer carrier carrying a sublimable dye is heated from the back side with a heating head to transfer a predetermined portion of the sublimable dye onto a transparent support to directly obtain an image.

However, when using this method of directly obtaining an image by transferring sublimation dye, the following problems arise.

That is, if the transparent support is formed from a plastic sheet without heat resistance, the transparent support will be deformed by the heat generated by the heating head during dye transfer. In order to eliminate this deformation, it has been proposed to treat the transparent support with a heat-resistant resin or to construct the transparent support itself from a material that can withstand the temperature of the head, but the adsorption of sublimation dyes is significantly reduced.

The present applicant previously filed Japanese Patent Application No. 59-77299 to form a heat-resistant treatment layer on which a transparent transfer material for sublimation transfer can be easily and clearly formed to form a photographic image. provided.

[Problem that the invention seeks to solve]

The present invention provides a transparent transfer medium for sublimation transfer, in which an image is obtained by transferring a sublimation dye, by forming a heat-resistant dye-receiving layer on a transparent support as described above, and forming an image with a high dye adsorption rate at particularly low energy. Furthermore, the stability of the image can be improved, and transfer contamination to other devices can be reliably prevented.

[Means for solving problems]

In the present invention, a thermoplastic resin having dye-dyeability is coated on one or both surfaces of a transparent plastic support.
For sublimation transfer, a transparent receiving layer of a dye consisting of ~98 parts by weight and 80 to 2 parts by weight of a compound having two or more unsaturated bonds in one molecule is formed to a thickness of, for example, 2 to 50 μ-. Constitutes a transparent transfer target.

To form an image on the object, a dyed ribbon is superimposed on the receiving layer, and a heating head is brought into contact with the dyed ribbon from the back side to heat the dyed ribbon with a heat pattern corresponding to the image pattern. This is carried out by sublimation transfer onto the receiving layer of the transfer target.

The thermoplastic resin having dyeability in the receiving layer of the object to be transferred according to the present invention, that is, the thermoplastic resin having dyeability with respect to the dye in the dyeing ribbon, includes saturated linear polyester resin, epoxy resin, etc. These include cellulose acetate resin, nylon resin, etc.

Examples of compounds having two or more unsaturated groups in one molecule include diallyl phthalate, trimethylolpropane tri(meth)acrylate, trimethylolethanetri(meth)acrylate, tetramethylolmethanetri(meth)acrylate, 1 .Multifunctional monomers represented by 6-hexanethiol di(meth)acrylate, bisphenol A type epoxy acrylate, novolak type epoxy acrylate, alkylene glycol gepoxy acrylate, brominated epoxy acrylate, glycidyl ester acrylate, etc. Polyfunctional epoxy acrylate, saturated dicarboxylic acids such as orthophthalic acid, isophthalic acid, terephthalic acid, adipic acid, and sebacic acid, polyols such as ethylene glycol, propylene glycol, and bisphenol A, and fumaric acid, maleic acid, and itacon at the terminals of the reactants. Polyfunctional unsaturated polyester obtained by reacting unsaturated dicarboxylic acids such as acids, 1.2 polybutadiene,
Polybutadiene represented by terminal acrylic-modified polybutadiene, terminal ester-modified polybutadiene, etc., ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, 1.3 butylene glycol di(meth)acrylate, etc. ) acrylate, polyfunctional polyether acrylate represented by neopentyl glycol di(meth)acrylate, polyester acrylate represented by compounds in which the terminals of reaction polyester with adipic acid and 1.6 hexanediol are modified with acrylic. ,1
．． 2-bis[4-(acryloyloxyjethoxy)phenyl]propane bis(acryloyloxyethyl)hydroxyethyl isocyanurate, tris(acryloyloxyethyl) isocyanurate, diallyloxy diacryloyloxycyclohexane, etc. can be used. .

In order to react with this unsaturated group, a peroxide such as benzoyl peroxide or hydroperoxide is dissolved as an initiator, or a metal soap such as cobalt naphthenate or dimethyl aniline dimethyl is used as a promoter to further accelerate the reaction. Tertiary amines such as para-toluidine may also be used. Further, crosslinking may be achieved by adding a sensitizer such as benzoin ethyl ether or benzophenone and irradiating with ultraviolet rays, or further by ionizing radiation such as electron beams or X-rays.

The reason why the content of the compound having an unsaturated group is set to 80 to 2% by weight is that if the plastic resin exceeds 98% by weight, crosslinking will not be sufficient and the heat resistance will be poor. This is because it has been recognized that fusion and deformation occur between the papers, and that if the plastic resin content is less than 20% by weight, the amount of dye adsorption becomes too small, making it difficult to obtain high-density images.

Moreover, the molecular weight of the compound having two or more radically polymerizable unsaturated groups in one molecule is 100 to 100.

Desirably, if the molecular weight is less than 100, it will become too hard, and if it is more than too much, the effect of preventing fusion between the dyed ribbon and the photographic paper during thermal transfer will be lost.

In addition, inorganic particles such as silica, calcium carbonate, kaolin clay, barium sulfate, titanium oxide, etc. may be added to the receiving layer to an extent that does not reduce transparency to obtain higher heat resistance and shrinkage resistance. I can do it.

[Effect]

According to the above-mentioned structure, since the thermoplastic resin is present in the receptor layer, the molecules of this resin can freely move with each other by heating with the heating head during image formation, that is, during dye sublimation dyeing. This allows the incoming dye to be taken in with high efficiency, making it possible to dye at a high concentration with low energy.Moreover, the melt deformation of this thermoplastic resin during dyeing is Similarly, the presence of a compound having two or more unsaturated groups in one molecule in the receptor layer suppresses the deformation caused by melting of the above-mentioned thermoplastic resin when heat is applied, that is, blurring and disturbance of images. However, the crosslinking provides stability after image formation and prevents contamination of others.

〔Example〕

Next, the present invention will be explained in detail.

Example 1 A treatment solution having the following composition was dried on a transparent support made of a polyester film having a thickness of 100 μm, and the film thickness was 15 μm.
It was applied so that the thickness was μ-biased.

This coating film was cured by irradiating it with ultraviolet rays using an ultraviolet lamp, and then further heated and cured at 80° C. for 24 hours to form a transparent receptor layer for the dye on the transparent support.

Example 2 A treatment solution having the following composition was coated onto a transparent support made of a polyarylate film having a thickness of 70 μm so that the film thickness after drying was 10 μm.

saturated polyester resin ...70 parts by weight This coating film was cured by heating at 120° C. for 5 minutes.

Example 3 A treatment solution with the following composition was dried on a transparent support made of a triacetate film with a thickness of 125 μm, and the film thickness was 15 μm.
It was applied so that it was thick.

This coating film was cured by heating at 60° C. for 48 hours. The treatment liquid described in Example 1 is further applied onto this coating film, dried, and then irradiated with ultraviolet light using an ultraviolet lamp. Thereafter, heat curing was further performed at 80° C. for 24 hours to form a transparent dye receiving layer.

Example 4 A treatment solution having the following composition was applied onto a transparent support made of a polyester film having a thickness of 100 μm.

This coating film was cured by irradiating it with ultraviolet rays using an ultraviolet lamp, and then further heated and cured at 80° C. for 24 hours to form a transparent receptor layer for the dye on the transparent support.

Example 5 A treatment solution having the following composition was applied onto a transparent support made of a polyester film having a thickness of 100 μI.

This coating film was cured by irradiating ultraviolet rays with an ultraviolet lamp, and then further cured at 80° C. for 24 hours to form a transparent receptor layer for the dye on the transparent support.

Comparative Example 1 A polyester film with a thickness of 100 μm was used as a transfer target.

Comparative Example 2 On a polyester film having a thickness of 100 μm, a single layer of primer was coated with a kiss coater so that the thickness after drying was 1 μm.

A treatment liquid having the following composition was applied thereon so as to have a dry thickness of 10 μm, and then heat-cured at 130° C. for 3 hours.

The dyed I-nobon coated and formed so as to have Ig/n (Ig/n) were overlapped and printed by heating from the back side of the ribbon.

Whether or not there is fusion with the dyed ribbon during printing on each side (
The case where fusion occurred is indicated by an x, the fusion force (the case where no fusion occurred is indicated by an ○), the transmittance of the printed part measured with Macbeth TD-904, and the relative humidity at 40 degrees and below 90%. Table 1 shows the results of each measurement of the stability, that is, the presence or absence of transfer to other papers (the case where the transfer was slightly disturbed is indicated by Δ, and the case where no transfer occurred is indicated by O).

As is clear from Table 1, the transfer material according to the present invention has excellent transparency and particularly excellent storage stability.

The transparent plastic support of the transparent transfer material for sublimation transfer according to the present invention may be made of polycarbonate resin, polysulfonic acid resin, etc. in addition to the above-mentioned examples.

The receiving layer formed on this support can be formed only on one side of the support, but if it is formed on both sides, it has the effect of preventing the transferred object from curling due to heat. Further, there is an advantage that it is possible to obtain the effect of compositely projecting images transferred and formed on both sides, for example, in an OHP.

〔Effect of the invention〕

According to the above-mentioned structure, since the thermoplastic resin is present in the receptor layer, the molecules of this resin can freely move with each other by heating with the heating head during image formation, that is, during dye sublimation dyeing. This allows the incoming dye to be taken in with high efficiency, making it possible to dye at a high concentration with low energy.Moreover, the melt deformation of this thermoplastic resin during dyeing is the same. Since a compound having two or more unsaturated groups in one molecule was present in the receptor layer, the thermoplastic resin was crosslinked by heating or (and) irradiation with radiation such as ultraviolet rays. Deformation due to melting during application of heat, that is, blurring and disturbance of the image, can be suppressed, and further, by crosslinking, stability can be obtained after image formation, and contamination of others can be prevented.

Furthermore, since the transfer paper itself has high transparency, it can be used for OHP materials, slides, etc. with great benefits.

Same as Hidemori Matsukuma

Claims (1)

[Claims] A dye consisting of 20 to 98 parts by weight of a thermoplastic resin having dyeability and 80 to 2 parts by weight of a compound having two or more radically polymerizable unsaturated bonds in one molecule, on a transparent plastic support. A transparent transfer material for sublimation transfer, comprising a transparent receiving layer.