KR100199565B1 - Process for producing the subbing layer of printing sheet used in heat sublimation transfer - Google Patents

Abstract

A sublimation type thermal transfer recording resin having an intermediate layer formed by applying an intermediate layer composition consisting of a polyester and a crosslinking agent on a substrate and the above-mentioned substrate, and a dye receiving layer formed on the intermediate layer, and having excellent binding force between the dye receiving layer and the substrate. It is a recording place.

Description

[Name of invention]

Interlayer composition of the receiving paper for sublimation thermal transfer recording

Detailed description of the invention

[Industrial use]

The present invention relates to a sublimation thermal transfer recording resin, and more particularly, to an intermediate layer of a sublimation thermal transfer recording resin in which an intermediate layer is introduced between a dye receiving layer and a substrate in order to improve the binding capacity of the dye receiving layer. It relates to a composition.

[Private Technology]

Thermal transfer recording is not only widely used in office automation equipment such as facsimile machines and copiers, but has also recently been extended to printing images that are electrically represented from color video cameras through video color printers.

Accordingly, a sublimation thermal transfer recording method has been proposed as a method for printing an image having high quality and gradation such as a color photograph on the fly from an electrical signal is required.

In the sublimation thermal transfer recording method, a color image reproduced by an electrical signal is color-separated by a color filter and separated into three images of red (R), green (G), and wave (B). The image is transmitted to the thermal element of the printer in the form of an electrical signal. In order to print on the printer, three colors of yellow, magenta, and cyan are alternately applied, and the ink ribbon applied to the transfer element is transferred to the thermal element in the form of a roll wound to the thermal element. The opposite side of the dye-coated side is heated repeatedly according to the electrical signals of each of the three images delivered separately. Through this process, yellow, magenta, and cyan dyes applied to the ink ribbon are transferred to the receiving paper, respectively, to obtain a natural color image by a combination of three dyes.

A method for producing a dye receiving layer of a paper used in a sublimation thermal transfer recording method is disclosed in US Pat. Nos. 4,720,480, 4,740,497, and 4,927,803, and the related art is described in US Pat. 4,778,782 and the like.

In addition, US Pat. No. 4,720,480 discloses a method of introducing an intermediate layer between the dye receiving layer and the substrate as a means for improving the adhesion between the ink ribbon and the receiving paper during thermal transfer and preventing partial omission of the reproduced image. In this patent, the intermediate layer material is a resin selected from polyester, polyurethane, polybutadiene, polyacrylate, epoxide, polyamide, rosin-modified phenol, terpene phenol and ethylene / vinylacetate copolymer. However, this method has a problem that the binding force between the dye receiving layer and the substrate is insufficient.

Therefore, it is required to introduce an intermediate layer that can improve the binding force and workability between the dye receiving layer and the substrate while serving as the intermediate layer proposed in the patent.

[PROBLEMS TO BE SOLVED BY THE INVENTION]

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to sublimate the introduction of the intermediate layer that provides a high working efficiency and easy working conditions with excellent binding between the dye receiving layer and the substrate. It is an object to provide a type of paper for thermal transfer recording.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an interlayer composition of a sublimation type thermal transfer recording resin, wherein an intermediate layer comprising a polyester resin and a crosslinking agent is formed between a substrate and a dye receiving layer.

The present invention also provides a sublimation-type thermal transfer recording paper comprising a substrate, an intermediate layer formed by applying an intermediate layer composition comprising a polyester and a crosslinking agent on the substrate, and a dye receiving layer formed on the intermediate layer.

In the present invention described above, the polyester resin is a saturated polyester resin having a molecular weight of 10,000 to 100,000, and a hydroxyl group or a carboxyl group is substituted at the end thereof and can be dissolved in an organic solvent. It is preferable that it is an alkyl titanate system as it can cause crosslinking between ester resins, and it is preferable that the said crosslinking agent adds 0.5-20 with respect to the polyester resin 100 by weight ratio.

In the present invention, it is preferable that the material of the dye-receiving layer is polyester, polyacrylate, polycarbonate, polyvinylacetate or polyurethane resin. It is preferable that the thickness of the substrate is 50 to 1000 It is preferable that it is m.

[Action]

The polyester resin used in the present invention is a saturated polyester resin having a molecular weight of 10,000 to 100,000, characterized in that the hydroxyl group or carboxyl group at the end and can be dissolved in an organic solvent. The concentration of the polyester resin dissolved in the organic solvent during application is 5 to 50% by weight, and the coating amount after drying is 0.5 g / m ² It is preferred to be in the range of 6 g / m ² .

As the crosslinking agent to be added, an alkyl titanate system is usually used, which causes crosslinking between polyester molecules. The amount of addition is preferably about 1 to 10 with respect to the polyester resin weight ratio 100.

As a factor that enhances the binding force between the dye receiving layer and the base material, the intermediate layer is first reacted with a hydroxyl group on the surface of the base material to which the inorganic crosslinking agent is added to improve the binding force of the intermediate layer itself to the base material and is also applied on the intermediate layer. It is said that the resin is crosslinked with the polyester resin of the dye receiving layer or reacts with the amino group of the modified silicone oil added to the dye receiving layer, thereby strengthening the binding capacity of the dye receiving layer to the intermediate layer. It is mentioned that the heat resistance is improved as a result of crosslinking to the crosslinking agent. This prevents the binding of the dye receiving layer from being weakened by softening the intermediate layer by heat during the image transfer process.

The material of the substrate to which the intermediate layer is applied is polyester sulfone, polyimide, cellulose acetate, copolymer of vinyl alcohol and acetal or transparent film such as polyethylene terephthalate, polyethylene coated white paper, polypropylene, polyester, etc. Synthetic paper produced and the like can be used. In the case of using synthetic paper as a base material, since synthetic paper itself is easily deformed by heat, it is preferable to use laminated paper on both top and bottom with white paper in the center for dimensional stability. The thickness of the base is usually 50 1000 It is appropriate to be in range.

As the material of the dye receiving layer, a material having an affinity with the dye to be transferred, having a good diffusion of the dye during the transfer process and excellent preservation of the dye after the transfer should be used. As such a substance, a polyester resin having an ester bond, a polyurethane resin having a urethane bond, and other resins having a large polar bond can be used. In addition to these resins, polyethylene wax, Teflon powder, silicone oil, and the like may be added to the dye receiving layer in order to improve releasability after dye transfer, and a surfactant for dispersing them may be used together. In addition, titanium dioxide, calcium carbonate, clay, zinc oxide, or the like may be added to improve whiteness.

The ink ribbon used with the receiving paper is roughly divided into a dye layer and a base material. The dye layer is composed of a dye and a binder. The dye is easily sublimated and not thermally decomposed when heat is transferred from the thermal element, and has a high molecular absorption coefficient and should be stable against light, moisture, and chemicals.

As dyes used in the dye layer of the ink ribbon, yellow dyes include methine and azopyridine dyes, and magenta dyes include heterocyclic azo and tricyano vinyl dyes. And phenylazoheterocyclic azo dyes. Binders used with these dyes in the dye layer of the ink ribbon include cellulose derivatives such as ethyl cellulose, hydroxyethyl cellulose, methyl cellulose, cellulose acetate formate, cellulose acetate propionate, cellulose acetate butyrate, polyvinyl alcohol, poly Vinyl resin derivatives such as vinyl acetate, polyvinyl butyral, polyacrylamide, polyacrylic acid, polymethyl methacrylate, polycarbonate, polysulfone or polyphenylene oxide and the like.

The base of the ink ribbon may be a polyester film such as polyethylene terephthalate, polyamide, polyacrylate, polycarbonate, cellulose ester, fluorine resin, polyacetal or polyimide film, and the like. Most suitable. The thickness of the ink ribbon substrate is 2 15 m is suitable.

On the back of the ink ribbon base material, it is 400 The heat resistant and release layer can be designed for the purpose of preventing the base film from deforming when contacted with the heat element generating heat up to and improving the releasability between the heat element and the base film. Materials used for this purpose include carboxylates, sulfonates, phosphates, aliphatic amine salts, polyoxyethylene alkyl esters, silicone oils or synthetic oils.

EXAMPLE

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention for demonstrating the constitution and effects of the present invention, and the present invention is not limited to the following examples.

Example 1

50 It is 80 on the upper and lower sides of the great white paper of m thickness The intermediate layer light dye receiving layer was formed by applying the m-thick synthetic paper (prince emulsifier, FPG-80) on a substrate prepared by laminating in the following manner to prepare a sublimation thermal transfer recording paper.

A) Application of intermediate layer

The following composition was applied after applying a bar coater on the substrate 100 Dried in a dryer for 30 seconds. The coating amount after drying was 3.25 g / m ² .

Interlayer composition amount (part by weight)

Polyester resin (Vylon 200 made in Toyobo, Japan) 14.1

Alkyl titanate (made by Dupont, Tyzor TBT) 0.7

Methyl ethyl ketone 42.6

Toluene 42.6

B) Application of dye receiving layer

The following composition was applied to the intermediate layer of the substrate on which the intermediate layer was applied using a bar coater, and 100 Dried in a dryer for 30 seconds. The coating amount after drying was 4.49 g / m ² .

Dye layer composition amount (part by weight)

Polyester resin (Vylon 103 made in Toyobo, Japan) 20

Amino modified silicone oil (Shinwol Chemical, KF-393) 0.02

Epoxy-Modified Silicone Oil (Shinwol Chemical, X-22-343) 0.02

Fluorinated Surfactant (3M, FC-430) 0.001

Methylene chloride 80

Example 2

Except for applying the intermediate layer in Example 1 using the following composition was carried out in substantially the same manner to prepare a sublimation type thermal transfer paper.

Intermediate worm composition amount (part by weight)

Polyester resin (Vylon 200, manufactured by Toyobo Corporation, Japan) 14.1

Alkyl titanate (made by Dupont, Tyzor TBT) 0.07

Methyl ethyl ketone 43.0

Toluene 43.0

Example 3

A sublimation thermal transfer recording paper was prepared in the same manner as in Example 1 except that the intermediate layer was applied using the following composition.

Intermediate worm composition amount (part by weight)

Polyester resin (Vylon 200, manufactured by Toyobo Corporation, Japan) 14.1

Alkyl titanate (manufactured by Dupont, Tyzor TBT) 2.8

Methyl ethyl ketone 42.0

Toluene 42.0

Example 4

A sublimation thermal transfer recording paper was produced in substantially the same manner as in Example 1 except that the polyester resin forming the intermediate layer was used as Vylon 103 manufactured by Toyobo, Japan.

Example 5

A sublimation thermal transfer recording resin was prepared in the same manner as in Example 1 except that the alkyl titanate forming the intermediate layer was used as Tyzor TPT manufactured by DuPont.

Example 6

A sublimation thermal transfer recording resin was prepared in the same manner as in Example 4 except that the alkyl titanate forming the intermediate layer was used as Tyzor TPT manufactured by DuPont, USA.

Comparative Example 1

A sublimation thermal transfer recording paper was produced in substantially the same manner as in Example 1 except that no intermediate layer was applied.

Comparative Example 2

A sublimation thermal transfer recording paper was prepared in the same manner as in Example 1 except that the intermediate layer was applied using the following composition.

Interlayer composition amount (part by weight)

Polyester resin (Vylon 200 made in Toyobo, Japan) 14.0

Methyl ethyl ketone 43.0

Toluene 43.0

Comparative Example 3

A sublimation thermal transfer recording paper was prepared in the same manner as in Comparative Example 2 except that the polyester resin in the intermediate layer composition was used as Vylon 103 manufactured by Toyobo Corporation, Japan.

Example 1 6 and Comparative Example 1 Scotch Magic Tape (manufactured by 3M Corporation) is approximately 1.90 cm on each sublimation type thermal transfer recording housing manufactured in Step 3. After sticking to a regular size of 5 cm, rub it several times with your hands, and then remove the Scotch Magic Tape three times.

In the above experiment, the adhesion of the dye-receiving layer to the substrate is judged by whether the dye-receptor is inferior. The experimental results are shown in the following (Table 1), in which 0 indicates that the dye receiving layer did not fall at all, and X indicates that the dye receiving layer had dropped even a little.

As can be seen from the results of Table 1, the sublimation-type thermal transfer recording resin of the Example coated with the crosslinking agent to the polyester resin according to the present invention and applied as an intermediate layer was more than a dye-receiving layer than the resin produced according to the comparative example. It can be seen that the binding force between the substrate and the substrate is excellent.

Claims (6)

a) molecular weight of 10,000 A saturated polyester resin which is 100,000, and the hydroxyl group and the carboxyl group are substituted by the terminal and can be melt | dissolved in the organic solvent; And b) an intermediate layer composition of a sublimation type thermal transfer recording resin, wherein an intermediate layer comprising an alkyl titanate-based crosslinking agent capable of causing crosslinking between polyester resins is formed between the substrate and the dye receiving layer. The intermediate layer composition according to claim 1, wherein the crosslinking agent is added in an amount of 0.5 to 30 parts by weight based on 100 parts by weight of the polyester resin. a) a substrate; b) on the substrate i) a molecular weight of 10,000 A saturated polyester resin which is 100,000, and the hydroxyl group and the carboxyl group are substituted by the terminal and can be melt | dissolved in the organic solvent; And ii) an intermediate layer formed by applying an intermediate layer composition comprising an alkyl titanate-based crosslinking agent capable of causing crosslinking between polyester resins. And c) a dye receiving layer formed on the intermediate layer. 4. The sublimation thermal transfer recording paper according to claim 3, wherein the dye receiving layer material is selected from the group consisting of polyester, polyacrylate, polycarbonate, polyvinylacetate or polyurethane resin. 4. The sublimation thermal transfer recording paper according to claim 3, wherein the base material is laminated on both upper and lower sides with white paper in the center. The method of claim 3, wherein the thickness of the substrate is 50 1000 m Sublimation type thermal transfer recording housing.