JPH04126290A - Method for coating melting type thermal transfer recording image - Google Patents

Abstract

PURPOSE:To perform lamination processing without bringing about the lowering of image quality by recording an image on at least one surfaces of two sheets using melting type thermal transfer ink having specific melt viscosity and closely bonding two sheets under heating so as to oppose the image recording surfaces thereof each other to laminate both of them. CONSTITUTION:An image is recorded on at least one surfaces of two sheets 1, 2 using melting type thermal transfer ink having melt viscosity of 10-5X10<3>Pa.S at 130 deg.C. A layer 3 having adhesive capacity is formed to the sheet 1 and, after recording, the image recording surface 3a of the sheet 1 and the image recording surface 2a of the sheet 2 are opposed in a close contact state and two sheets 1, 2 are bonded under heating and pressure to be laminated. In this case, the melt viscosity of the adhesive surface of at least one of two sheets is 1X10<2>-5X10<4>Pa.S at 130 deg.C.

Description

[Detailed description of the invention] [! Field of Industrial Application] The present invention relates to a method for coating a melt-type thermal transfer recorded image, in which two sheets are brought into close contact with each other with their image recording surfaces inside and bonded under heat and pressure.

[Prior Art] Melting type thermal transfer recording can be used, for example, to create driver's licenses, identification cards, etc., but the recorded images are protected for the purpose of protecting their surfaces and preventing forgery and alteration. It may be laminated with an adhesive film or the like.

[Problems to be Solved by the Invention] By the way, this melt-type thermal transfer recorded image can be coated by recording an image on a sheet and then bringing the two sheets into close contact with each other by heating and pressing the two sheets with their image recording surfaces facing each other. This method cannot be used because images recorded using the melt-type thermal transfer method would be crushed by the heat and pressure during lamination, resulting in lower product sales. There wasn't.

The present invention has been made to solve this problem, and aims to provide a method for coating a melt-type thermal transfer recorded image that can be laminated without causing deterioration of both pages.

[Means for Solving the LiJ Problem] In order to solve the above-mentioned problem, the method for coating a melt-type thermal transfer recorded image of the present invention provides a method for coating a melt-type heat-sensitive transfer recorded image, in which at least one surface of two sheets has a melt viscosity of 10 at 130°C. ~5×10
An image is recorded with a melt-type thermal transfer ink of 4 Pa-3, and after this recording, the two sheets are laminated by heating and pressing the two sheets in close contact with each other, with the image recording surfaces facing each other, and at least one of the two sheets is laminated. The melt viscosity at 130°C of one adhesive surface is I X 10" ~ 5x'l O'
It is characterized by being Pa ・S.

The measured values of melt viscosity described in this invention are all c
This is a value measured using a Rheomat 30 viscometer manufactured by Ontraves. In addition, the shear rate at that time was 1.4 sec-'' in the case of melt-type thermal transfer ink, and 0.19 sec-' in the case of the adhesive surface of the sheet.

For example, the sheet used in this invention may be made of synthetic paper (Yupo [manufactured by Tamako Yuka Co., Ltd.], peach coat [manufactured by Nisshinbo Co., Ltd.], etc.), upper paper, art paper, coated paper, cast coated paper, etc. Paper, resin-coated paper, synthetic resin-impregnated paper, latex-impregnated paper, etc., polyester, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polyacrylic acid ester, polyolefin, polycarbonate, polystyrene, phenol. Resin, various plastic films or sheets such as cellulose triacetate, glass, metals (aluminum, steresis, etc.), etc. are used.

These plastic films or sheets may contain pigments or air to provide color or increase the bending strength of the film or sheet. Examples of pigments include carbonates of alkaline earth metals, TiO2,
It is composed of MgO1ZnO, alumina, silica, carbon black, etc.

The image receiving layer on the surface of this support is composed of various resins and additives. Examples of resins include polyamide resins (nylon, etc.), polyester resins, poly(meth)acrylate resins (polymethyl methacrylate, polyethyl acrylate, etc.), polyurethane resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins,
Polyvinyl acetate resin, polyvinyl chloride-vinyl acetate resin, polystyrene-acrylic resin, polyethylene-vinyl acetate resin, polyethylene resin, polypropylene resin, polybutadiene resin, polyvinyl alcohol resin, phenolic resin, cellulose resin (methyl cellulose, ethyl cellulose, carboxymethylcellulose, nitrocellulose, acetylcellulose, etc.), polyvinyl ether resin, polyvinylpyrrolidone resin, polyvinylaniline resin, polysulfone resin, polycarbonate resin,
Melamine resin, ionomer resin, polysiloxane resin, acetal resin (polyvinyl butyral, polyvinyl acetal, polyvinyl formal, etc.), petroleum resin, rosin resin, coumaron-indene resin, terpene resin, styrene-butadiene rubber, isoprene rubber, nitrile Rubber, photographic gelatin, polyether sulfone resin, or epoxy resin can be used alone or in combination of two or more, and the support may be coated with this.Also, vinyl chloride, vinyl alkyl ether, It may be a copolymer such as a copolymer of acrylic acid ester, etc. Furthermore, an alkaline earth metal carbonate (calcium carbonate, barium carbonate, etc.) may be used as an additive.
, TiO2, Mg0%ZnO, inorganic pigments such as alumina, silica, etc., hardening agents or oligomers such as isocyanate, epoxy, acrylic, etc., oils such as silicone oil, lanolin oil, liquid paraffin, silicone resin, fluorine resin (Teflon), etc. , fluorine-containing acrylic resins, etc.), polysiloxane resins, and acetal resins (polyvinyl butyral, polyvinyl acetal, polyvinyl formal, etc.).

Also, at least one side of the two sheets has 13
An image is recorded using a melt type thermal transfer ink having a melt viscosity of 10 to 5 x 10'Pia-3 at 0°C.

A thermal transfer material is used to record an image with this melt-type thermal transfer ink. This thermal transfer material has a support and an ink layer, and on this support, for example, as a thin film base for an ink ribbon support, materials such as polyester, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, Polyacrylic acid ester, polyolefin, polycarbonate, polystyrene, phenolic resin, cellulose triacetate, condenser paper, glassine paper,
Film thickness: 3 to 12 μm, etc. is used, and back coat (BC
) layer, and in addition to the ink layer, there may be an intermediate layer, an overcoat (OC) layer, etc. as the melt transfer layer.

The melt-transfer layer may be melted by heat and has the property of exhibiting adhesiveness to the substrate, and is generally composed of the following materials.

As dyes and pigments, alkaline earth metal carbonates, TiO
2, MgO1ZnO, alumina, silica, carbon black, nigrosine dye, Sudan Black SM, First Yellow G1 Benzidine Eiro, Pigment Yellow, Oil Yellow GG, Zapon First Yellow CGG1 Sumi Blast Yellow GG, India First Orange, Sumi Blast Orange G, Pigment Orange R1 Zapon Fast Orange GG.

Irgazin Red, Balanitroaniline Red, Toluidine Red, Lysole Red 2G, Lake Red 0, Oil Scarlet, Pomelo First Scarlet OG, Eisenspiron Red BEH, Methyl Violet B Lake, Phthalocyanine Blue, Pigment Blue, First Gen All known dye pigments such as Blue 5007, Victoria Blue F4R1 Sudan Blue, Oil Peacock Blue Brilliant Green B, and Phthalocyanine Green can be used.

Waxes include carnauba wax, montan wax, beeswax 5 rice wax, candelilla wax,
Examples include lanolin wax, paraffin wax, microcrystalline wax, polyethylene wax, Sasol wax, oxidized wax, amide wax, and silicone wax.

As thermoplastic resins, polyamide resins (nylon, etc.),
Polyester resin, poly(meth)acrylate resin (polymethyl methacrylate, polyethyl acrylate, etc.), polyurethane resin, polyvinyl chloride resin,
Polyvinylidene chloride resin, polystyrene resin, polyvinyl acetate resin, polyvinyl chloride-vinyl acetate resin, polystyrene-acrylic resin, polyethylene-vinyl acetate resin, polyethylene resin, polypropylene resin, polybutadiene resin, polyvinyl alcohol resin, phenolic resin, cellulose resin Resins (methylcellulose, ethylcellulose, carboxymethylcellulose, nitrocellulose, acetylcellulose, etc.), polyvinyl ether resin, polyvinylpyrrolidone resin, polyvinylaniline resin, polysulfone resin, polycarbonate resin, ionomer resin, polysiloxane resin, acetal resin (polyvinyl butyral, polyvinyl acetal, polyvinyl formal, etc.), petroleum-based resins, rosin-based resins, chroman-indene resins, terpene-based resins, styrene-butadiene rubber, isoprene rubber, nitrile rubber, etc.

In addition, as additives, various surfactants, higher fatty acids (
stearic acid, palmitic acid, lauric acid, etc.), long chain alcohols (stearyl alcohol, etc.), metal salts of long chain fatty acids (alcium stearate, zinc balmitate, etc.), antioxidants, various ligating agents, silicone oil, etc. There is.

The preferred composition ratio of each of these materials differs depending on the layer structure used. The ink layer may have a multilayer structure for efficient thermal transfer by heating, for example, the following layers may be laminated in order on the base material, but the ink layer is not limited thereto.

■Subside side [color material layer ■Peeling layer, color material layer, adhesive layer ■Color material layer, adhesive layer The ink layer has a melt viscosity of 10 to 5xlO at 130°C
'Pa・S, and the melt viscosity is 10~5×104Pa・
When the melt viscosity is smaller than S, the transferred characters are crushed, and when the melt viscosity is larger than 10 to 5×10 3 Pa·S, the transferability deteriorates.

After recording, the two sheets are laminated by placing the image recording surfaces facing each other and heat-pressing the two sheets in close contact with each other. , 1x102~5xlO'
It is Pa・S.

For example, as shown in FIG. 1, sheets 1.2 are placed facing each other, and a layer 3 having adhesive properties is formed on this sheet 1. The image recording surface 3a of sheet 1 and the image recording surface 2a of sheet 2 are opposed to each other, and the image recording surface 3a of these two sheets 1.2.

2a are brought into close contact with each other and laminated by heat-pressing.

Further, as shown in FIG. 2, the layer 3 having adhesive ability is placed between the sheets 1.2, and the image recording surface 1a of the sheet 1 and the image recording surface 3a of the layer 3 having adhesive ability are also connected. The image recording surface 3a of the layer 3 having adhesive ability and the image recording surface 2a of the sheet 2 are laminated by bringing them into close contact and heat-pressing them. In this case, the structure of the present invention is a sheet on which an image is recorded and a sheet that is heated and pressed facing the image recording surface.

Furthermore, as shown in FIG. 3, sheets 1 and 2 are placed facing each other, and a layer 3 having adhesive ability is formed on these sheets 1 and 2. The image recording surface 3a of sheet 1 and the image recording surface 3a of sheet 2 are made to face each other, and the images of these two sheets 1 and 2 are recorded. Recording surface 3a.

3a are brought into close contact with each other and laminated by heat-pressing.

The sheets 1 and 2 may be heat-pressed together as transfer sheets or as a transfer sheet and a protective sheet, and at least one side of the sheet is transparent (
(It may be colored) so that you can view the recorded image. Furthermore, the melt viscosity (at 130°C) of the adhesion surface of the layer 3 having adhesive ability, which may be further laminated from the outside of the two heat-pressed sheets, is 1X10''~
5xlO'Pa-3, and if it is larger than this range, the characters will be severely distorted, or if it is smaller than this range, the fusion property will be weak. A coating agent similar to that used for the image-receiving layer can be used.

[Function] In the present invention, the melt-type heat-sensitive transfer recorded image is coated by recording an image on a sheet, and then laminating the two sheets by placing the two sheets in close contact with each other and heat-pressing them, with the image recording surfaces facing each other. Images recorded by this melt-type thermal transfer method are laminated without being crushed by heat, pressure, etc. during lamination.

[Example] Examples of the present invention will be described in detail below.

Example 1 The following ink ribbon was used as a thermal transfer material.

Carbon black as coloring material layer (1.0 μm) MHI・2o5 (Kaikoku Dyes) solid content 30% Tackifier resin Tamanol 510.521.526 (Arayo Chemical Co., Ltd.) Base Poly Y-EV210.40Y, 250 (Mitsui DuPont Chemical Co., Ltd.) ] Ink ribbons were made using carnauba wax (Nippon Seisou) by varying the melt viscosity by varying the amounts added.

Specific examples of this prescription are shown in Table 1.

Table 1 Release layer: EV210 5 parts by weight Paraffin wax 0 μm Support: PE7 4.5 μm (Toshi) AST Nitrocellulose 30 parts by weight Allyl silicone resin 70 parts by weight 95 parts by weight (Hiki Seiro) 0.2 μm Using.

For the image receiving sheet, white PET 100 μm was used as a support, and 18 parts by weight of Byron 200 (Toyobo) and Shin-Etsu Silicon X were placed on this support.
-24-83102 parts by weight 90 parts by weight of methyl ethyl ketone was coated with a wire bar and dried (film thickness: 4 μm).As a printing device, TECB-30 and a barcode printer were used to print characters. did.

The laminate material was manufactured by Japan GBC Co., Ltd., and had a PET base thickness of 50 μm and an adhesive layer thickness of 45 μm (melt viscosity of the adhesive layer at 130°C: 3.8×10”Pa, S).
The laminator is Fujibra Co., Ltd. LPCI Fu02PRO,
Lamination was carried out at a lamination temperature of 140°C (roller surface).

Table 2 shows a visual comparison of the transferability to the image-receiving sheet during printing and the collapse of the print after lamination.

Table 2 Transferability to the image-receiving sheet during printing is evaluated on a 5-point scale from 1 to 5, and the flatness of the print after lamination is similarly evaluated on a 5-point scale from 1 to 5. The 5th side is evaluated as bad, and the 5th side is evaluated as good, and in this invention, both of these are evaluated as good.

Example 2 The following ink ribbon was used as a thermal transfer material.

The ink formulation was made as follows.

Coloring material layer (1.0 μm): Carbon black: MHI-20567 parts by weight Tackifier: 75 parts by weight Tamanol 510 Base polymer: 5 parts by weight EV-40Y (melt viscosity at 130°C: 1.0XIO' Pa, S ) The release layer, support, and AST were the same as in Example 1.

Furthermore, the same printing device and laminator as in Example 1 were used.

For the image-receiving sheet, 100 μm white PET was used as a support, and 9 parts by weight of polyvinyl chloride (degree of polymerization about 600), 9 parts by weight of Shin-Etsu Silicon X-24-83001, and 90 parts by weight of methyl ethyl ketone were coated with a wire bar. , the dried one was used (f
i! thickness 5 μm).

The laminate material is composed of a support (50 μm) and an adhesive (SO μm). A transparent PET film was used as a support.

The following adhesive was used.

I EP4022w Mitsui DuPont Chemical 50 Zero Super Ester^-us 'Tc River Chemical 50 Electric 2
EV21G 1008 3 EV250 10091 4 εV21i0 10G96 5 Commercially available laminate material A 6 Commercially available laminate material B 7 Commercially available laminate material C 8 Commercially available laminate material By changing the melt viscosity of the adhesive of the laminating agent in this way, it is possible to prevent the printing from collapsing after lamination. Table 3 shows a comparison of the fusion properties.

As for the printed characters, one level was evaluated as in Example 1.

Regarding the fusion property, those that peeled off at room temperature and could be easily peeled off were evaluated as ×, and those that destroyed the interface between the image-receiving sheet and the binder were evaluated as ○.

Table 3 Example 3 Similar results were obtained in Examples 1 and 2 when printing was performed under the same conditions except that printing was performed on a laminate material by mirror image printing and laminated with an image receiving sheet.

Example 4 Similar results were obtained when the image receiving sheet used in Example 1 was the same except that Color Paper Type SR manufactured by Konica Corp. was used.

[Effects of the Invention] As described above, in this invention, at least one surface of the two sheets has a melt viscosity of 10 to 130°C.
An image is recorded with a melt-type thermal transfer ink of 5X10"Pa・S, and after this recording, the image recording surfaces are faced to each other, and the two
Laminate the two sheets by bringing them together and heat-pressing them, and one of the adhesive surfaces of at least one of these two sheets
Melt viscosity at 30°C is I x 102 to 5 x 104
Pa-3, and images recorded by the melt-type thermal transfer method are not crushed by heat, pressure, etc. during lamination, and can be laminated well.

[Brief explanation of drawings]

FIGS. 1 to 'fS3 are diagrams showing a method of coating a melt-type thermal transfer recorded image according to the present invention. In the figure, 1.2 is a sheet, 3 is a layer with adhesive ability, Ia
, 2m, and 3a are image recording surfaces.

Claims (1)

[Claims] An image is recorded on at least one side of the two sheets with a melt-type thermal transfer ink having a melt viscosity of 10 to 5 x 10^3 Pa・S at 130°C, and after this recording, the image recording surfaces are faced to each other. The two sheets are laminated by being brought into close contact with each other and heat-pressed, and the melt viscosity at 130°C of at least one of the adhesive surfaces of the two sheets is 1.
A method for coating a melt-type thermal transfer recorded image, characterized in that the pressure is x10^2 to 5 x 10^4 Pa.S.