JP2000280640A - Manufacture of printed product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a thermal transfer printed product of good adhesion properties of ink using a base without the necessity of a process of using a solvent and a coating equipment thereof by printing only on required sections without the necessity of resin coating the whole surface of a base to be thermal transferred. SOLUTION: Printing is carried out by a photo-setting ink manufactured by melting a 20-70 pts.wt. acrylic resin per 100 pts.wt. of polymeric monomer on a base and adding a photopolymerization starting agent therein, and then photo-setting is applied to form an ink layer, and then the thermal transfer printing is carried out on the ink layer. As the base, various materials such as a paper, a synthetic resin and a metal can be used. As the polymeric monomer, a monomer of low viscosity, superior acrylic resin melting properties and demonstrating good adhesion properties with the base when being photo-set is preferably used. As the acrylic resin, a resin containing a small amount of other components in compliance with the necessity, for example, a small amount of acrylic acid and the like can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a printed product on which thermal transfer printing is performed.

[0002]

2. Description of the Related Art Conventionally, thermal transfer printing such as printing for thermally transferring toner, printing for thermally transferring solid ink applied on a ribbon, and printing for thermally transferring a sublimable dye to various printing substrates has been known. Printing is generally referred to as thermal transfer printing). However, depending on the type of the printing base material, the adhesiveness to the ink to be thermally transferred is poor, and troubles such as poor printing and poor adhesion of the ink to a printed product often occur.

[0003] In order to cope with such troubles, thermal transfer printing has been performed after a resin having good adhesion to thermal transfer ink is coated on the entire surface of a film substrate to be printed.

[0004]

However, in such a method, there is an uneconomical effect that the entire surface of the base material is coated and the resin is applied to a portion where thermal transfer printing is not performed. There are disadvantages such as the use of a solvent and the need for heat and equipment for evaporating and removing the solvent.

[0005] In addition, when the substrate is a plate or a molded product, there is a disadvantage that the coating operation is difficult, and further, the substrate is deformed or deteriorated by the action of heat of a solvent in the coating operation for a long time. There were also disadvantages such as cases.

Accordingly, an object of the present invention is to eliminate the need to previously coat the entire surface of a substrate to be thermally transferred with a resin, and to obtain good adhesion between the ink and the substrate only by printing the necessary portions. An object of the present invention is to provide a method for producing a printed product that can obtain a high-quality thermal transfer printed product and that does not require a step using a solvent or a coating facility.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a polymerizable monomer 100 is provided on a substrate.
A photocurable ink obtained by dissolving 20 to 70 parts by weight of an acrylic resin per part by weight and further adding a photopolymerization initiator is printed, and a photocuring treatment is performed to form an ink layer. Provided is a method for manufacturing a printed product, which is characterized by performing thermal transfer printing.

As the substrate used in the present invention, various substances such as paper, synthetic resin, metal and the like can be used. Conventionally, the substrate is widely used as a substrate for thermal transfer printing. The synthetic resin substrate, which has many problems, will be described in detail. Examples thereof include thermoplastic resins such as polypropylene, polycarbonate, and polyethylene terephthalate. Examples of thermosetting resins that have been significantly problematic include melamine resins, phenolic resins, epoxy resins, and photocurable resins. Furthermore, examples of the photocurable resin include a spin coat layer coated on the back surface of a compact disc and cured by ultraviolet rays.

In the method of the present invention, a special photocurable ink is printed on a printing substrate. This photocurable ink is obtained by dissolving 20 to 70 parts by weight of an acrylic resin per 100 parts by weight of a polymerizable monomer and further adding a photopolymerization initiator. Examples of the polymerizable monomer include monofunctional monomers such as acryloyl morpholine, phenoxyethyl acrylate, isobornyl acrylate, lauryl acrylate, and methoxyethyl acrylate, (poly) propylene glycol diacrylate, dicyclopentanyl diacrylate, and 1. Examples include polyfunctional monomers such as 6-hexanediol diacrylate and trimethylolpropane triacrylate. Or,
In addition, oligomers such as urethane acrylate can also be used. The polymerizable monomer preferably has a low viscosity, is excellent in solubility of an acrylic resin, and shows good adhesion to a substrate when cured with light.

The acrylic resin used in the photocurable ink of the present invention is generally a (co) polymer of methacrylate or acrylate. Also,
If necessary, a small amount of other components, for example, those containing a small amount of acrylic acid or the like may be used. Many such acrylic resins are commercially available as binders for solvent-type printing inks, and these acrylic resins can be used. As a specific example, an acrylic resin belonging to Dianal (registered trademark, manufactured by Mitsubishi Rayon Co., Ltd.) can be given.

The amount of the acrylic resin used in the photocurable ink of the present invention depends on the amount of the polymerizable monomer used.
20 to 70 parts by weight per part by weight, preferably 30 to
６０60 parts by weight. If the amount is less than 20 parts by weight, a failure in thermal transfer printing may occur, or poor adhesion of thermal transfer printing ink in thermal transfer printing may occur. On the other hand, when the amount exceeds 70 parts by weight, the viscosity of the photocurable ink extremely increases, which causes printing failure, lowers flexibility, and causes blurred transfer images.

Further, the photocurable ink of the present invention comprises:
In general, it is necessary to cure with light, especially ultraviolet light, and therefore contains a photopolymerization initiator. Examples of photopolymerization initiators that initiate polymerization by ultraviolet light include benzoin ethyl ether, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, and 2-methyl-1- (4 -(Methylthio) phenyl) -2-morpholinopropane-1, bisacylphosphine oxide, thioxanthone and the like.

Further, additives such as a pigment, an antifoaming agent, and a leveling agent can be added to the photocurable ink of the present invention as needed. However, it is not preferable to use an additive such as a silicon-based antifoaming agent that exerts a strong peeling property. In addition, when printing on a flexible substrate such as a film, an oligomer such as (poly) urethane (meth) acrylate may be used for the purpose of imparting flexibility to the photocurable ink. it can.

In the present invention, the photocurable ink can be printed on a substrate by various known printing methods. Generally, the ink has a high viscosity, and has a viscosity of 10 to 30 μm.
Screen printing is the most preferable method because it is easy to obtain an ink layer of a certain degree, and it is easy to print not only on a film but also on a board or a formed substrate. The printed ink layer is easily cured by ultraviolet irradiation.

As a final step, thermal transfer printing is performed on the photocured ink layer. The thermal transfer printing in the present invention includes electrophotography, toner printing such as a laser printer, and ribbon or foil. Use thermal transfer printing,
Thermal transfer printing using a sublimation dye is included.

[0016]

EXAMPLES Examples of the present invention will be described below with reference to comparative examples.

[0017]

[Table 1] In Examples 1 to 3 and Comparative Examples 1 and 2, the various raw materials shown in Table 1 were blended at the weight ratios shown in the same table, and these were dispersed using a stirrer to prepare ultraviolet curable inks. . In addition, as for the acrylic resin, Dynal BR5
0 (manufactured by Mitsubishi Rayon Co., Ltd.). The thus prepared UV curable inks of Examples 1 to 3 and Comparative Examples 1 and 2 were screen-printed on a synthetic resin base material (Crisper G2323 manufactured by Toyobo Co., Ltd.) using a 300-mesh screen. The composition was cured by irradiating ultraviolet rays to form ink layers 1 to 5 each having a thickness of 25 μm. In Comparative Example 3, the ink layer was not formed by the ultraviolet curable ink.

Next, in Examples 1-3 and Comparative Examples 1 and 2, printing was performed on the ink layer using a thermal transfer ribbon using a thermal transfer color printer. In Comparative Example 3, Printing was performed directly on the substrate, and the thermal transfer printing performance was examined. The thermal transfer printing performance was determined by the adhesiveness of the thermal transfer ink and the sharpness (the sharpness of the image), and the results shown in Table 2 below were obtained.

[0019]

[Table 2] In the evaluations in Table 2, 〇 indicates good, △ indicates slightly defective, and × indicates defective.

As shown in Table 2, Examples 1 to 3 using an ultraviolet curable ink obtained by dissolving 20 to 70 parts by weight of an acrylic resin per 100 parts by weight of a polymerizable monomer.
, Both the adhesion and the sharpness of the thermal transfer ink were "good". However, in Comparative Example 1 in which the acrylic resin was less than 20 parts by weight, both the adhesion and the sharpness were "poor", and Comparative Example 2 in which the acrylic resin exceeded 70 parts by weight and Comparative Example 2 in which the ink layer was not formed. In Example 3,
The adhesion was "slightly poor" and the sharpness was "poor". Therefore, the effectiveness of the method for producing a printed product according to the present invention was confirmed from the above results.

[0021]

As described above, according to the present invention, it is not necessary to coat the entire surface of the substrate to be thermally transferred with a resin in advance, and only by printing the necessary portions, the ink is obtained while ensuring economical efficiency. A good quality thermal transfer printing product having good adhesion between the substrate and the substrate can be obtained. In addition, a high-quality thermal transfer with good adhesion between the ink and the substrate is required without requiring a process using a solvent or a coating facility, and without deforming or altering the substrate due to the action of the heat of the solvent in the coating operation. Printing products can be obtained.

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Claims (3)

[Claims] 1. A photocurable ink obtained by dissolving 20 to 70 parts by weight of an acrylic resin per 100 parts by weight of a polymerizable monomer and further adding a photopolymerization initiator on a base material,
A method for producing a printed product, comprising: performing a light curing treatment to form an ink layer, and then performing thermal transfer printing on the ink layer. 2. The method according to claim 1, wherein the substrate is a synthetic resin substrate. 3. The production of a printed product according to claim 2, wherein the synthetic resin substrate is any one of a thermoplastic resin substrate, a thermosetting resin substrate, and a photocurable resin substrate. Method.