JPS60212385A - Thermal transfer recording material - Google Patents

Abstract

PURPOSE:To provide the titled recording material accompanied by little ground contamination, excellent in clearness and fastness of printed images and having a ground whitened, wherein a wax is incorporated in one of an organic acid metallic salt color former and a phenol color developer, the color former and the color developer are applied respectively to separate bases, and the resultant materials are laminated on each other. CONSTITUTION:A wax (e.g., paraffin wax) is incorporated in one of an organic acid metallic salt color former (e.g., ferric stearate) and a phenol color developer (e.g., tannin), the wax being incorporated preferably in the color. The color former and the color developer are applied respectively to separate sheet form or film form bases (e.g., synthetic resin film), and the resultant materials are laminated on each other with the coated sides in contact with each other, to obtain the objective recording material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive transfer recording material, and more particularly to a heat-sensitive transfer recording material for recording by directly transferring a color former to a recording paper using heat.

Traditionally, thermal recording methods have been known for their high speed.

While it has advantages such as high reliability and excellent operability,
The recording paper was expensive, and there were drawbacks such as a lack of recording robustness such as light resistance and oil resistance. To solve this problem, several thermal recording methods have been proposed so far, in which coloring material is melted by heat and transferred directly to plain paper for recording. For example, as shown in Japanese Patent Publication No. 54-10495, solid ink is applied to a film made of paper or resin, and heated with a heating element from the side opposite to the coated surface or from the coated surface side via recording paper. There is a method of recording by melting solid ink and transferring the ink to recording paper.

However, although recording by these methods is fast, there are problems such as scumming due to rubbing, and since the coated surface is colored, it has been desired to whiten it.゛Therefore, the present inventors solved the drawbacks of the above-mentioned conventional technology, and
We conducted extensive research to develop a heat-sensitive transfer recording material that maintains the robustness of recording, is free from background smudges, and has a white background. As a result, they found that the objective could be achieved by coating an organic acid metal salt color former and a phenol color developer on separate supports and incorporating wax into one of them, and developed the present invention. It was completed.

That is, the present invention provides a film-like or sheet-like support (1) coated with an organic acid metal salt-based color former and a film-like or sheet-like support coated with a phenol-based color developer (I).
I), and the support (1), (n)
The present invention provides a heat-sensitive transfer recording material characterized in that either one of an organic acid metal salt color former and a phenol color developer applied to the heat-sensitive transfer recording material contains a wax.

The heat-sensitive transfer recording material of the present invention consists of a pair of supports: a support (1) coated with an organic acid metal salt color former and a support (II) coated with a phenol color developer. There are a variety of organic acid metal salt-based coloring agents used here, including organic acid metal salts conventionally used as coloring agents in thermal recording methods, and may be appropriately selected depending on the purpose of use. Specifically, preferred examples include higher fatty acid metal salts such as ferric stearate, ferric myristate, nickel palmitate, tin stearate, silver behenate, silver stearate, and ferric pelarginate. However, it is not limited to these.

On the other hand, a phenolic color developer is applied to the support (II) that is paired with the support (1) coated with an organic acid metal salt color former. There are a variety of color developers, including phenolic compounds, which have traditionally been used as color developers in thermal recording methods, and there are no particular limitations, and they may be selected as appropriate depending on the type of organic acid metal salt color developer mentioned above. . Specifically, tannins and tannic acid.

Suitable examples include gallic acid, methyl gallate, ethyl gallate, propyl gallate, lauryl gallate, pyrogallol, diphenylcarbazide, and the like, but are not limited thereto.

In the present invention, it is necessary to contain wax in either the organic acid metal salt color former or the phenol color developer described above. If wax is mixed with either one of these color forming agents and color developing agents, and the color forming component or color developing component is encapsulated by this wax, the support (1) and the support (n) coated with these can be separated. Even if the organic acid metal salt color former and the phenol color developer are brought into contact with each other,
At room temperature, the presence of wax suppresses the reaction between the color-forming component and the color-developing component, so there is no risk of color development due to friction, etc. (There is no need to worry about scumming. The content of wax to be added to any of the color developers is not particularly limited, as long as it is the amount that encapsulates the color-forming component or the color-developing component, or more. It may be added in an amount of 1 to 20 times (by weight), preferably 3 to 10 times the amount (by weight) of a certain organic acid metal salt color former or phenol color developer which is a color developing component.

In this way, wax may be contained in either an organic acid metal salt color former or a phenol color developer, but
From the viewpoint of effectively preventing scumming, it is preferable that the organic acid metal salt color former contains wax. There are various types of wax used here, and there are no particular limitations, as long as the wax is solid at room temperature and easily melted by a heat source such as a thermal head of a thermal printer. Specifically, paraffin wax 4 microcrystalline wax, carnauba wax, montan wax, polyethylene wax, and wood wax.

Examples include hydrogenated beef tallow oil, stearic acid monoglyceride, and other synthetic waxes. In addition, in order to adjust the melting point (more correctly, the melting point of wax) of the color former or color developer mixed with wax, and/or to stably disperse the color former, paste or liquid mineral oil, glycerin, etc. , cottonseed oil, octyl alcohol, triethylene glycol, polyalkylene glycol or its derivatives, polyoxyethylene alkylamine, etc. can be added together with the wax. Note that to mix the organic acid metal salt color former or phenol color developer with wax, it is possible to mix them directly, but the organic acid metal salt color former or phenol color developer may be mixed with toluene, ethyl acetate,
Methyl ethyl ketone.

It is preferable to mix an organic solvent, such as methanol or sialgylnaphthalene, or something previously dissolved in water with the wax because it will be uniformly dispersed.

Furthermore, in the present invention, in the organic acid metal salt color former or phenol color developer applied to the support (I) or (II),
Addition of zinc compounds is also effective. However, it is preferable to add this zinc compound to the wax-containing one of the organic acid metal salt color former and the phenol color developer. In particular, an organic acid metal salt-based color former to which a zinc compound is added together with wax has even better color development sensitivity, light fastness, and the like. Zinc compounds that can be added here include zinc oxide and zinc carbonate.

Examples include zinc chloride and zinc hydroxide, with zinc oxide being particularly preferred. In addition, when adding this zinc compound, its mixing ratio varies depending on the penetration level of the wax used and other conditions, and cannot be unambiguously determined, but it is usually an organic acid metal salt color former or a phenol color developer. 1 of the whole
A range of 80% by weight, preferably 20-50% by weight is effective.

In addition, in the present invention, a transfer recording material is constituted by a pair of supports (1) and (n), one of the supports is used as a transfer layer (a layer on which characters to be transferred, etc. are printed), and the other support is is used as a transfer layer (a layer on which transferred characters, etc. are displayed). Here, the organic acid metal salt color former or phenolic color developer may be applied to either the transfer layer or the support forming the transferred layer, but the wax must be applied to the support forming the transfer layer. It will be contained in a color former or developer. It is also effective to apply oil-proofing treatment to the support on which the transfer layer is formed, in order to prevent the wax from seeping in when melted. Furthermore, the aforementioned resin components should also be applied to the support of the transfer layer.

On the other hand, it is also effective to add a binder, various white pigments, etc. together with a color former or developer to the support forming the transfer layer.

The transfer recording material of the present invention comprises the above-mentioned pair of supports (I),
(n) is formed by applying a wax-containing color forming agent or color developer on the support (I) used here, (
II) may be in the form of a film or sheet as long as it can be easily printed. Usually, paper is widely used, but synthetic resin films, woven fabric sheets, metal sheets, etc. can also be used.

When using the transfer recording material of the present invention, the support (I) coated with an organic acid metal salt-based color former and the support (n) coated with a phenol-based color developer are placed with their coated surfaces inside each other. When stacked face-to-face and brought into contact with a heating element such as a thermal head of a thermal printer or a heat pen from the side opposite to the coated side of the support that forms the transfer layer, the wax in the transfer layer will melt and color will develop accordingly. The agent and the color developer react with each other, and characters, etc. are transferred to the transfer layer.

The heat-sensitive transfer recording material of the present invention does not cause background stains due to friction, etc., has good color development sensitivity, and has sufficient print clarity and fastness.Moreover, if a white pigment is added as desired, the background color can be improved. whiteness can be increased.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Ferric stearate 2.5g, carnauba wax 7.5g
g and 7.5 g of paraffin wax were melt-mixed while heating at about 100° C. to obtain an organic acid metal salt coloring agent.

Meanwhile, 10 g of methyl gallate, polyvinyl alcohol (
Add 20 g of polyvinyl alcohol (10% liquid), 10 g of kaolin, and 20 g of water to 10 g of a liquid prepared by crushing and dispersing 10 g of 10% liquid) and 20 g of water in a ball mill for 2 days.
was added and thoroughly mixed to obtain a phenolic color developer.

Next, the above-mentioned organic acid metal salt-based coloring agent is applied to general paper with a basis weight of 50 g/m" or less, so that the coating amount after drying is about 2 to 5 g/m".
A coloring agent sheet (transfer layer sheet) was obtained by hot-melt coating so that Apply water-based coating to a coating amount of approximately 5 to 10 g/m'' and apply a color developer sheet (transfer layer sheet).
I got it.

Thereafter, this color forming agent sheet and color developing agent sheet were layered to make thermal recording paper, and its performance was evaluated. The results are shown in Table 1.

Example 2 2.5 g of ferric myristate, 7.5 g of carnauba wax
g and 7.5 g of Candelilla wax were melt-mixed while heating at about 100° C. to obtain an organic acid metal salt coloring agent.

Meanwhile, 10 g of gallic acid, polyvinyl alcohol (10%
SBR latex (45%) is added to 10 g of a liquid prepared by crushing and dispersing 10 g of liquid) and 20 g of water in a ball mill for 2 days.
5 g of kaolin, 10 g of kaolin, and 35 g of water were added and thoroughly mixed to obtain a phenolic color developer.

Thereafter, a color former and a color developer were applied to general paper in the same manner as in Example 1 to obtain a color former sheet and a color developer sheet.

Next, the performance was evaluated. The results are shown in Table 1.

Example 3 2.5 g of ferric stearate was mixed with 2 dialkylnaphthalenes.
．． Thereafter, 7.5 g of zinc oxide 5L carnauba wax and 7.5 g of candelilla wax were added and melted and mixed while heating at about 100° C. to obtain an organic acid metal salt color former.

On the other hand, acrylic latex (
45%), 10 g of kaolin, and 35 g of water were added and thoroughly mixed to obtain a phenolic color developer.

Thereafter, a color former and a color developer were applied to general paper in the same manner as in Example 1 to obtain a color former sheet and a color developer sheet.

Next, the performance was evaluated. The results are shown in Table 1.

Table 1 (1) Values are measured using a Macbeth densitometer (black).

(2) Sunlight fastness is 5% using a fade meter for fully colored paper.
After irradiating with ultraviolet light for an hour, the remaining concentration was measured using a Macbeth densitometer.

(3) Penetration ASTM D-132170 (100
g, 25°C, 5 seconds).

Procedural Juho Seisho (Spontaneous) June 19, 1985 Patent Office Chief Manabu Shiga 1. Indication of Case Patent Application 1983-68583 2. Name of Invention Heat-sensitive Transfer Recording Material 3. Person Making Amendment Case Relationship with Patent applicant Tokai Valve Co., Ltd. 4, Agent ■ 104 No. 5, 1-1-1-1 Kyobashi, Chuo-ku, Tokyo Column 6 of the detailed description of the invention in the specification subject to amendment No. 6 Description of contents of amendment Page 13, Table 1, bottom 4th line [(3) Penetration is A
STM D-132170J "(3) Penetration is JIS
Corrected to K 2235 (ASTM D-1321)J.

(that's all)

Claims (2)

[Claims] (1) It consists of a film-like or sheet-like support (1) coated with an organic acid metal salt color former and a film-like or sheet-like support coated with a phenolic color developer (TI), A heat-sensitive transfer recording material characterized in that either one of an organic acid metal salt color former and a phenol color developer coated on the supports (1) and (n) contains wax. (2) The heat-sensitive transfer recording material according to claim 1, wherein the organic acid metal salt coloring agent contains wax.