JPH09248974A - Recording self adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high resolution and high gradation without developing transposition, coloring and uneven transferring by a method wherein this sheet is formed by laminating a recording body, self-adhesive and a release sheet and, in addition, the smoothness of the non-releasing surface of the release sheet is specified. SOLUTION: Various films such as a polyethylene terephthalate film and its foamed body, a polyamide film or the like, various papers such as synthetic paper, wood free paper or the like and various laminates or the like is example as a support used in a recording body. As a self-adhesive later, a rubber-based self-adhesive such as a synthetic rubber or material rubber, a mixture of a tacky producing resin and a softener and an acrylic self-adhesive produced by emulsion polymerization method or the like is employed. As for a release sheet, its base material is set from the view point of coloring properties and reproducibility so as to have the smoothness of the non-releasing surface of 300sec or more and its center-line mean roughness Ra or 2μm or less. As the application method of a releasant, a self-adhesive, other processing agent or the like, a graver coating method, a reversal coating method or the like is employed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording pressure-sensitive adhesive sheet useful for recording a full-color image or the like on a recording medium in continuous gradation by using a thermal head or the like.

[0002]

2. Description of the Related Art As a color recording system, various systems such as an electrophotographic system, an ink jet recording system, a thermal transfer recording system and a thermal recording system have been studied. In general, the receiving paper for high-definition images, such as printing full-color images, must have a smooth surface so that each printed dot can be accurately reproduced, and in order to make close contact with the thermal head. The cushioning property is required to some extent, and the gradation property in dot units is also required. When tacking the receiving paper as described above, Japanese Patent Application Laid-Open No. 4-1
As described in Japanese Patent Application No. 043, a high-quality paper or a coated paper is subjected to a sealing treatment, a polyethylene (PE) -laminated treatment surface, or JP-A-3-25.
As described in Japanese Patent No. 2480, a release agent is directly applied to the surface of a support to obtain a release sheet, an adhesive is applied to the release surface of the release sheet, and the release sheet is attached to the back surface of the receiving paper to obtain a color. It was used as a recording adhesive sheet for use in printers and the like.

[0003]

In the pressure-sensitive adhesive sheet for recording obtained by the color printer or the like obtained as described above, the release surface of the release sheet is smooth to some extent, but, for example, a portion where ink is not transferred, that is, a white spot occurs. However, there are problems such as color unevenness and uneven transfer due to uneven pressure of the thermal head, which has been an important issue that must be solved as high resolution and high gradation are required.

[0004]

Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the problems in the pressure-sensitive adhesive sheet for recording having the release sheet as described above, and as a result, the non-release surface of the release sheet, that is, the laminated sheet. It has been found that the surface characteristics of the back surface of the body contribute to the elimination of the above-mentioned white spots and transfer unevenness on the recording surface of the recording body, which requires particularly high resolution and high gradation.
The present invention for solving the above-mentioned problems is obtained by laminating a recording material / adhesive / release sheet, and the non-release surface of the release sheet has an Oken type smoothness of 300 seconds or more and a center line average roughness. R
It relates to a recording pressure-sensitive adhesive sheet having an a value of 2 μ or less. Further, the present invention is characterized in that the recording body is a recording body used for recording with a recording pixel density of 130 dpi (dots per inch) or more by a fusion type thermal transfer system, a sublimation type thermal transfer system or a thermal recording system. The above-mentioned recording pressure-sensitive adhesive sheet. Furthermore, the present invention relates to a recording body used for recording with a recording pixel density of 280 dpi or more.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive sheet for recording of the present invention has a laminate structure composed of a recording medium / adhesive / release sheet. The recording material in the recording pressure-sensitive adhesive sheet of the present invention may be recordable on the substrate itself, but is usually a melting type thermal transfer system, a sublimation type thermal transfer system or a thermal recording system in which a recording layer is provided on the surface of a support. It is a recording material on which a recorded image is formed by a recording method using a thermal head such as a recording method, and is particularly suitable for a recording material requiring high resolution and high gradation. As a thermal recording material in which a recording layer is directly colored by a thermal head, for example, JP-A-48-8654 can be used.
No. 3 and Japanese Patent Application Laid-Open No. 51-146239, it is possible to distinguish by providing two thermosensitive coloring layers that develop different colors like the multicolor thermosensitive recording medium, and give different amounts of heat. A recording body for obtaining a color is exemplified. Each thermosensitive coloring layer of such a thermosensitive recording medium contains a dye that develops a specific color and a developer.

Further, it has a decoloring action on the color recording system of the thermosensitive recording medium as described in JP-A-55-81193 and JP-A-2-80287, that is, the color-forming system of the low-temperature color-forming layer when heated at a high temperature. By using a decoloring agent, a type in which a coloring color tone of only the high temperature coloring layer is obtained when heated at a high temperature is exemplified. Further, by utilizing the property that a diazo compound decomposes with light and the property that a diazo compound reacts with a coupler to develop a color, a combination of heat and light is used to obtain multiple colors. JP-A-60-242093 and JP-A-60-242093 A thermal recording material as described in JP 61-40192 A can be mentioned.
In the case of this heat-sensitive recording material, it is possible to obtain each individual color tone of each color-developing layer, and it is also possible to develop each color at the same time, so that the color tone can be expressed by so-called color mixing.

In the case of a sublimation type thermal transfer recording medium for recording with a dye sublimated by heat from a thermal head, the sublimation type thermal transfer image receiving layer is selected from a thermoplastic resin having an affinity for the dye or a cross-linked product thereof. . As the dye-dyeable thermoplastic resin, a polyester resin is generally preferable, but an epoxy resin, a vinyl chloride copolymer, a polycarbonate or the like can be used. As the cross-linking agent for these resins, a cross-linking agent having reactivity with the functional group of the resin such as polyfunctional isocyanate can be used.

In the case of a fusion type thermal transfer recording medium for recording with ink melted by heat from a thermal head,
The melt type thermal transfer recording layer is obtained by providing a layer containing an oil absorbing pigment and a binder. As a pigment,
Various fillers such as hexagonal columnar and spindle-shaped various settling calcium carbonate, ground calcium carbonate, various clays, calcined clays, titanium dioxide, aluminum hydroxide, talc,
It may contain calcium silicate, calcium sulfate, magnesium silicate, synthetic amorphous silica and the like. If necessary, a pigment may be added to a resin such as a polyester resin to form a fusion type thermal transfer recording layer.

The support used for the recording medium is not particularly limited, but various films such as polyethylene terephthalate film and its foam, polyamide film, polyaramid film, polycarbonate film, cellophane, polypropylene film, synthetic Examples include various papers such as paper, coated paper, high-quality paper, and various laminated products. Since the recording body comes into contact with the thermal head of the recording apparatus, it is preferable that the supporting body has smoothness, appropriate cushioning properties, and low thermal diffusivity.
Among them, polyethylene terephthalate film and its foam are particularly preferable.

Regarding the release sheet, first, the base material has a smoothness of the non-release surface of 300 seconds or more and an Ra value of 2 μ or less, preferably 300 seconds or more, from the viewpoint of color developability and reproducibility.
Ra value of 1.5 μ or less, more preferably 350 seconds or more, R
It has an a value of 1 μ or less. When the smoothness of the non-peeling surface is less than 300 seconds and the Ra value is more than 2μ, white spots, uneven coloring, and the like occur as the resolution and gradation are increased. The same applies to the case where the smoothness of the non-peeling surface is 300 seconds or more and the Ra value exceeds 2 μ, and the smoothness of the non-peeling surface is less than 300 seconds and the Ra value is 2 μm or less. Even if only the smoothness is high, white spots and uneven coloring may occur if the surface is roughened in spots. The same applies when only the Ra value condition is satisfied. When the recording adhesive sheet of the present invention is used at a slightly high resolution and gradation of about 130 to 280 dpi, an excellent image free from uneven coloring and white spots can be obtained.
In the case of high density recording of 80 dpi or more, according to the present invention, an excellent image having no white spots or uneven coloring is obtained, and particularly an excellent full color image is obtained.

The measuring method is as described in J. TAPP
I No. 5 Asahi Seiko KK-made, Oken type smoothness tester (model KY-5) was used, and it showed by the average of n = 5.
Regarding the center line average roughness Ra value, JIS-B0601-
According to 1967, the cutoff was 0.25 mm and the measurement length was 4 mm. Examples of the release paper substrate include polyethylene terephthalate film and its foam, polyamide film, polyaramid film, polycarbonate film, polysulfone film, cellophane, polypropylene film, synthetic paper, coated paper, fine paper, kraft paper,
Glassine paper and the like are conceivable, but in the case of a paper-based substrate, it is preferable to perform a sealing treatment or the like as necessary. Among these, a polyethylene terephthalate film foam and a synthetic paper are preferable from the viewpoint of cushioning property and smoothness. As for the peeled surface, the smoothness and R
It is undesirable for a to be far apart. In addition, there is no problem even if the non-peeling surface is subjected to a treatment for improving the running property, charging, etc. as long as it is within the specified value.

The release agent is not particularly limited, but a suitable one such as silicone type or non-silicone type can be used depending on the application.

The pressure-sensitive adhesive layer is a mixture of a rubber-based pressure-sensitive adhesive, that is, synthetic rubber or natural rubber, a tackifying resin and a softening agent, an acrylic pressure-sensitive adhesive produced by an emulsion polymerization method or a solution polymerization method, that is, an acrylic ester. It can be formed by appropriately using a copolymer of an acrylic compound having a functional group and a silicone adhesive, that is, a mixture of a silicone rubber and a silicone resin. It is most desirable to use a system adhesive. From the viewpoint of improving the adhesiveness between the surface base material (recording medium) and the pressure-sensitive adhesive as a characteristic of the pressure-sensitive adhesive, and further improving cohesive force and preventing adhesive residue, a cross-linking pressure-sensitive adhesive having a strong internal cohesive force, that is, a cross-linking agent The so-called two-component crosslinked acrylic pressure-sensitive adhesive added is suitable.

The method of applying the release agent, the pressure sensitive adhesive, the other treating agent, etc. is not particularly limited, but for example, a gravure coating method, a reverse coating method, a reverse gravure coating method,
Known methods such as a kiss coating method, a die coating method, a bar coating method, a knife coating method and a comma coating method can be applied. The coating speed and the coating film drying conditions are not particularly limited, but it is desirable that the coating film drying conditions be performed within a range that does not adversely affect the physical properties of the release layer, the pressure-sensitive adhesive, and the substrate.

[0015]

EXAMPLES The present invention will be described in more detail based on examples of recording pressure-sensitive adhesive sheets for color printers. Example 1 A biaxially stretched film obtained by filling a polyethylene terephthalate with a pigment and stretching it to obtain a film [Toyobo Co., Ltd.].
Made, product name "Crisper" (5 smoothed by roll
0 μ foamed PET)] as a release sheet substrate, and 0.2 ± 0.05 g / m ² of silicone release agent “LTC-750A” manufactured by Toray Dow Corning Silicone Co., Ltd.
(DRY), a release sheet having a release layer was obtained by applying with a Mayer bar. Next, Toyo Ink Co., Ltd.
Made acrylic adhesive BPS-4849-40N, 100
2 parts by weight of Coronate L, which is a polyfunctional aromatic polyisocyanate manufactured by Nippon Polyurethane Industry Co., Ltd., as a cross-linking agent was added to the parts by weight, and the resulting mixture was sufficiently stirred to give 15 g / m ² (DRY) to the release sheet. Was applied with an applicator to obtain a laminate of the pressure-sensitive adhesive layer and the release sheet. As a recording medium, a TA paper manufactured by Fuji Photo Co., Ltd. (three colors of yellow, magenta, and cyan are micro-capped, and a full-color thermal recording paper having a recording layer surface in which the coloring temperature of each color is changed, Was adhered to the non-recording layer surface (using white PET) and laminated to obtain a heat-sensitive recording pressure-sensitive adhesive sheet for a color printer.

Example 2 Peach coat (Nisshinbo Co., Ltd.), which is a fusion type thermal transfer recording medium produced by applying a coating material prepared by adding a polyester resin, titanium oxide and calcium carbonate using dimethylformamide as a solvent, onto synthetic paper. )) Was used. The synthetic paper is a synthetic paper obtained by adding a white pigment to polypropylene and stretching it into a film having a three-layer structure [Yupo FPG60 manufactured by Oji Yuka Synthetic Paper Co., Ltd.]. A recording pressure-sensitive adhesive sheet for a full-color printer for melt-type thermal transfer recording was manufactured in the same manner as in Example 1 except that this peach coat was replaced with TA paper.

Example 3 The synthetic paper, YUPO FPG60 (Oji Yuka Synthetic Paper Co., Ltd.)
A heat-sensitive recording pressure-sensitive adhesive sheet for a full-color printer was obtained in the same manner as in Example 1 except that (Production) was used as the release sheet base material.

Comparative Example 1 For a full-color printer in the same manner as in Example 1 except that a sheet obtained by laminating polyethylene on high-quality paper was used as a release sheet substrate and a release agent was applied to the laminated surface to obtain a release sheet. An adhesive sheet for heat-sensitive recording was obtained.

Comparative Example 2 A full-color printer was used in the same manner as in Example 1 except that a sheet obtained by pulping the pulp into a highly viscous beaker and applying polyvinyl alcohol on both sides was used as a release sheet substrate. A heat-sensitive recording pressure-sensitive adhesive sheet was obtained.

Comparative Example 3 Synthetic paper YUPO FPG60 [Oji Yuka Synthetic Paper Co., Ltd.]
Manufactured in the same manner as in Comparative Example 1 except that the peach coat (manufactured by Nisshinbo Co., Ltd.), which is a full-color melt type thermal transfer recording paper on which a receiving layer based on polyester resin is formed, is replaced with TA paper. A recording pressure-sensitive adhesive sheet for a melt-type thermal transfer full-color printer was obtained.

(Measurement method of characteristics) (1) Printing test and running property A full-color printer suitable for the recording layer was used,
A 1,000-color gradation pattern was printed, and the runnability at the time of printing and the state of the printed screen were visually evaluated. Printers used: The thermal recording adhesive sheets of Examples 1 and 3 and Comparative Examples 1 and 2 were F manufactured by Fuji Photo Film Co., Ltd.
UJIX FOT JOY PRINTER NC1
Use (300 dpi). As the adhesive sheets for fusion type thermal transfer recording in Example 2 and Comparative Example 3, MD2000J (600 dpi) yellow, magenta, cyan and black four colors manufactured by Alps Electric Co., Ltd. were used.

[Evaluation of printed screen (unevenness of printing)] O: An excellent image having no white spots and unevenness of printing (uneven coloring) was obtained. X: White spots are recognized. [Running property] Paper jam of the heat-sensitive recording pressure-sensitive adhesive sheet was evaluated by passing 12 sheets of the recording pressure-sensitive adhesive sheet A6. For paper jam of the fusion type thermal transfer recording sheet, use the recording adhesive sheet A4
Two sheets were evaluated. ◯: No paper jam occurs. ×: Paper jam

(2) Smoothness Oken type smoothness tester (model KY-5) manufactured by Asahi Seiko Co., Ltd.
In accordance with JIS-P-8119, the average was shown as n = 5.

(3) Surface roughness Universal surface profilometer (MODEL) manufactured by Kosaka Laboratory Ltd.
SE-3C), according to JIS-B0601-1967, the center line average roughness Ra (μ) was determined at a cutoff of 0.25 mm and a measurement length of 4 mm. Table 1 shows the measurement results.

[0025]

[Table 1]

In the method of the present invention, from the viewpoint of the smoothness of the back surface of the release sheet, by reducing the roughness of the surface, the thermal head does not pick up small irregularities, and even if the resolution is high, color development is achieved. There is no deterioration in color and uneven color. Further, it is possible to obtain a pressure-sensitive adhesive sheet for a color printer, which is free from bleeding, color development due to pressure unevenness of the thermal head, and transfer unevenness.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09J 7/02 JKW C09J 7/02 JLE JKY B41M 5/18 B JLE 5/26 101H

Claims (2)

[Claims] 1. A laminated body of recording material / adhesive / release sheet, wherein the non-release surface of the release sheet has an Oken type smoothness of 30.
A pressure-sensitive adhesive sheet for recording, which has a center line average roughness Ra value of 2 μ or less at 0 seconds or more. 2. The recording body has a recording pixel density of 1 according to a melting type thermal transfer system, a sublimation type thermal transfer system or a thermal recording system.
The pressure-sensitive adhesive sheet for recording according to claim 1, which is a recording medium used for recording at 30 dpi or more.