JPS6219493A - Heat-sensitive transfer recording material - Google Patents

Abstract

PURPOSE:To provide the heat-sensitive transfer recording material indicating the high sticking-preventive effect, by using the layer containing at least one kind to be selected among polyethylene glycol, polypropylene glycol and ethylene glycol/propylene glycol block copolymer as the sticking preventive layer. CONSTITUTION:The layer containing at least one kind to be selected among polyethylene glycol, polypropylene glycol and ethylene glycol/propylene glycol block copolymer is used as the sticking preventive layer. Though the amount of its adhering substance differs with the molecular weight, 0.01-0.5g/m<2> is generally enough for the base material. Further, the formation of this sticking preventive layer to the base material can be carried out by dissolving the sticking preventive component with a suitable solvent, for instance water, and applying it on the base material to be dried. In that case, the concentration of sticking preventive component in the solvent is 0.1-5wt% level and the conditions for drying is good at 70-100 deg.C for 10-30sec.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a heat-sensitive transfer recording material having a heat-sensitive transfer layer on the upper surface of a film base material and a stick prevention layer on the lower surface.

[Prior art]

2. Description of the Related Art Heat-sensitive transfer recording materials are known in which a heat-melting ink layer containing a colorant or a layer containing a heat-reactive coloring reaction component is provided on a base material such as paper or a plastic film. For those with a heat-melting ink layer, a colored image can be obtained by overlaying paper as a receptor sheet and thermally printing from the bottom surface of the substrate with a thermal head to transfer the molten ink onto the receptor sheet. On the other hand, those having a heat-reactive color-forming reaction component-containing layer can be used as a receiving sheet on top of the layer.
A colored image is formed on the surface of the receiving sheet by stacking paper or a sheet containing a layer containing a reactive component that reacts with the coloring reactive component and generates color when heated, and thermally printing from the bottom surface of the substrate with a thermal head. be able to.

By the way, when a plastic film is used as the base material in such a thermal transfer recording material, the melting point of the plastic film is at most about 200 to 300°C and the heat distortion temperature is about 100°C, whereas the thermal head Since the surface temperature of the thermal head reaches a high temperature of 300 to 400°C or higher, there are problems such as the plastic film sticking to the thermal head and the fused plastic film adhering to the thermal head, resulting in so-called stick residue. Ta. Furthermore, in order to prevent such a stick phenomenon, it has been proposed to provide a stick prevention layer on the lower surface of the plastic film (the contact surface of the thermal head). For example, it has been proposed to use a metal layer, a heat-resistant resin layer, a benztriazole layer, an ethyl cellulose layer containing sodium stearyl sulfonate, a polyester resin layer containing stearic acid, etc. as a stick prevention layer. For any of the stick prevention layers, if the amount of adhesion is small, sufficient stick prevention effect will not be obtained, and if the amount of adhesion is too large, the heat sensitivity will decrease due to an increase in heat capacity, and the stick prevention layer will not be able to stick. This method has disadvantages such as new generation of stick residue.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks found in the prior art and to provide a thermal transfer recording material having an anti-stick layer that exhibits a high anti-stick effect even with a small amount of adhesion.

〔composition〕

According to the present invention, in a thermal transfer recording material having a heat-sensitive transfer layer on the upper surface of a film base material and a stick prevention layer on the lower surface of the film base material, the stick prevention layer may contain polyethylene glycol, polypropylene glycol, or ethylene glycol. Provided is a heat-sensitive transfer recording material characterized by using a layer containing at least one type selected from the group consisting of: /propylene glycol block copolymer.

In the present invention, at least one kind selected from polyethylene glycol, polypropylene gellicol, and ethylene glycol/propylene glycol block copolymer is used as the stick prevention component to be contained in the stick prevention layer. As the glycol/propylene glycol block copolymer, for example, one represented by the following formula (1) can be used.

1'13 (In the formula, p, q and r represent integers of 1 or more) Such a stick-preventing component used in the present invention exhibits a high stick-preventing effect with an extremely small amount of adhesion, and the amount of adhesion is Although it varies depending on the molecular weight, it is usually 0.0 for the base material.
1-0.5g/bo, preferably 0.02-0.2g
/rrr is sufficient. The anti-stick layer can be formed on a substrate by dissolving the anti-stick component in a suitable solvent, such as water, and coating the solution on the substrate and drying it. In this case, the concentration of the anti-stick component in the solvent is 0.1 to 5% by weight, preferably 0.1% to 5% by weight.
It is about 3 to 2% by weight, and the drying conditions are 70 to 10% by weight.
It may take about 10 to 30 seconds at 0°C.

As the plastic film used as the base material in the present invention, those formed from various conventionally known thermoplastic resins can be used, such as polyester film, polyamide film, polyolefin film,
Examples include polycarbonate film, cellulose film, etc., and the thickness thereof is usually 2 to 50 μm, preferably 3 μm.
It is about 10 μm.

In the present invention, the type of the thermal transfer layer formed on the film base material is not limited, and a non-reactive type or a reactive type can be arbitrarily used. An example of a transfer layer made of a color ink and a one-reaction type is a transfer layer containing one of the reaction components of a color-forming reaction system in the following combinations.

(1) Combination of leuco dye and color developer (electron-accepting substance).

(2) Combinations of long-chain aliphatic iron salts such as ferric stearate and ferric myristylate with phenols such as tannic acid, gallic acid, and ammonium salicylate.

(3) To heavy metal sulfates such as silver, lead, mercury, thorium sulfates and Na-tetrathione-1, sodium thiosulfate,
In combination with sulfur compounds such as thiourea.

(4) A combination of a noble metal salt of an organic acid such as silver behenate or silver stearate and an aromatic organic reducing agent such as protocatechuic acid, spiroindane, or hydroquinone.

(5) Combinations of organic acid lead salts such as lead caproate, lead pelargonate, and lead behenate with thiourea derivatives such as ethylenethiourea and N-dodecylthiourea.

When using a thermal transfer recording material having a reactive thermal transfer layer as described above, the receiving sheet 1 to which the transfer is to be performed requires a thermal transfer material that reacts with the reactive components contained in the color-forming reaction thermal transfer layer consisting of the above-mentioned combinations. A sheet is used that has a receptive polish containing a reactive component that causes color development. For example, when the thermal transfer layer contains a leuco dye, a receiving sheet containing a color developer such as a phenolic substance can be used as the receiving sheet.

Further, the color-forming reaction system consisting of a combination of the two types of reaction components described above can be contained in the thermal transfer layer in a state in which the color-forming reaction is prevented in advance. A thermal transfer recording material having a thermal transfer layer containing such a color-forming reaction component can transfer an image consisting of a molten deposit of five color-forming reaction products onto paper as a receiving sheet by thermal transfer.

Taking a non-reactive heat-sensitive transfer layer as an example, the method for forming the layer will be explained. 1. A composition consisting of a coloring agent, a binder agent, etc. is coated with a hot null coating on a film substrate, or the composition is dispersed in an appropriate solvent. A layer having a thickness of about 1 to 20 μm can be formed by solvent coating the coating solution. As the colorant, any of various dyes or pigments such as carbon black, which have been conventionally used in the field of copying paper, can be used, and as the binder, waxes such as carnauba wax, wood wax, and beeswax can be used. I can do it.

〔effect〕

The thermal recording material of the present invention includes thermal transfer paper, thermal transfer ribbon,
It is used as a heat-sensitive stencil for digital plate making and has the following advantages.

(1) The anti-stick component used in the present invention can provide a good anti-stick effect with a very small amount of coating.In addition to the base material scum (melted base film) 1, the anti-stick component itself can cause thermal head There is almost no adhesion or accumulation on the surface.

(2) Due to the properties of the anti-stick component used in the present invention, it has a strong adsorption force (ion adsorption) on the film surface (high oil film strength), so it is hardly removed by contact with the head, so it is not removed as scum. It doesn't stick.

(3) The anti-stick component used in the present invention does not need to be thermally cured, and the anti-stick layer can be obtained by ordinary coating and drying operations.

(4) Since the anti-stick layer used in the present invention has an effect of preventing -1jF, it is possible to prevent dirt and dust from adhering to the product surface due to static electricity, and also to avoid adhesion of products to each other due to static electricity.

(5) The stick prevention component used in the present invention does not need to be used in conjunction with a binder resin, so the amount of application can be kept to an extremely low level, preventing a decrease in the thermal sensitivity of the product, and preventing stickiness of the binder resin itself from adhering to the thermal head. Does not cause any problems.

〔Example〕

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

Example 1 A heat-sensitive transferable ink composition having the following component composition was applied to the upper surface of a 6 μm thick polyester film, dried, and
A thermal transfer layer with a thickness of 4 μm was formed.

Carnauba wax 20 parts by weight Paraffin wax (melting point 65°C) 30% Oxidized wax
10〃Vaseline
10 //Carbon black
20 Next, on the bottom surface of the film having the heat-sensitive transfer layer made of the heat-melting ink layer, apply the stick-preventing component shown in Table 1 in an aqueous solution to a wire bar (diameter 0.1
+*m) and dried to form A-1 to H-1 and A-
Products 2 to H-2 were obtained.

Furthermore, in this example, the amount of the anti-stick layer deposited is extremely small (0.1 per substrate IM).
In Table 1, the adhesion amount of the anti-stick layer is expressed using the concentration of the coating liquid in consideration of measurement errors. For reference, the amount of adhesion is in the range of 0.03 to 0.05 g/rf for a solution with a concentration of 0.5% by weight, and 0.06 to 0.1 g/rf in the case of a concentration of 1% by weight.

Table-1 Next, regarding each of the thermal transfer recording materials obtained above.

A paper serving as a receptor sheet was placed on the surface of the thermal transfer layer, and thermal printing was performed from the surface of the anti-stick layer by applying heat of 0.7 mJ/dot using a thermal head as a heating means to obtain a transferred image on the receptor sheet. . in this case,
The feeding speed (traveling speed) of the thermal transfer recording material to the thermal head was 12 cm/sec. The following table shows the performance evaluation results of each product when thermal transfer was performed in this manner.

The evaluation items shown in Table 2 have the following meanings.

(1) Stick property Indicates whether or not the product sticks (adhesiveness) to the thermal head and its size.

(2) Drivability Indicates the difficulty level of feeding the transfer material tape ribbon.

(If it sticks, the ribbon will not feed smoothly, and if it is severe, it will break.) (3) Substrate residue adhesion The presence or absence of adhesion of polyester film residue used as a base material to the thermal head and its size are shown.

(4) Adhesion of anti-stick component scum Shows the presence or absence and size of adhesion of anti-stick agent scum to the thermal head.

(5) Running performance Indicates the degree of deterioration in print quality.

(Cleaning is required if debris adheres to the thermal head and accumulates. If you print without cleaning,
Quality deteriorates. ) Test not possible...The stick is too large to perform a running test.

Slightly defective...Image unevenness caused by debris Table 2

Claims (1)

[Claims] (1) In a thermal transfer recording material having a heat-sensitive transfer layer on the upper surface of a film base material and a stick prevention layer on the lower surface of the film base material, polyethylene glycol, polypropylene glycol, and ethylene glycol/propylene glycol are used as the stick prevention layer. A thermal transfer recording material characterized by using a layer containing at least one type selected from block copolymers.