JPS6046037B2 - heat sensitive recording material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive recording material applied to heat-sensitive recording paper, etc., and is particularly characterized in that it enables heating recording by absorption of light.

Conventional heat-sensitive recording materials have a structure in which a heat-sensitive recording layer is coated on a support such as paper or polymer film.

The electron-accepting component and electron-donating component as a heat-sensitive recording material used in this heat-sensitive recording layer include (1) long-chain fatty acids as those forming images of metals, metal oxides, or metal chelate compounds; Silver salt 10 organic reducing agents, (b) long chain fatty acid iron salt + chelating agent, (c) organic acid heavy metal salt + alkaline earth metal sulfide, (d) organic acid heavy metal salt 10 chelating agent,
There are combinations of (e) fatty acid ferric salt + thiosemicarbazide derivative or isothiosemicarbazide derivative, (f) organic acid lead salt + thiourea derivative, and (2) those that form dye images. , (a) tetrazolium salt + reducing agent, (b) aromatic amine ten aromatic N-nitrosamine, (c) leuco dye + phenols, etc., and these (1) and (2)
) The heat-sensitive recording layers obtained by the above methods are all white or nearly white. Coloring of the image on the above-mentioned heat-sensitive recording material is achieved by (1) using a thermal head to develop the image, and (2) superimposing a black pattern on the heat-sensitive recording layer and irradiating light from the pattern side to make the pattern black. There is a method to color the corresponding parts.

However, in the image coloring method (1), the high-temperature thermal head comes into direct contact with the heat-sensitive recording material, which causes abrasion of the thermal head, adhesion of recording gas to the thermal head, adhesion between the thermal head and the heat-sensitive recording material, and the recording speed. In addition, in the image coloring method (2), a lot of radiant energy is required to generate heat in the light absorber (
It has the disadvantages of poor sensitivity and slow response speed. For this reason, in recent years, heat-sensitive recording has been developed in which light-absorbing substances such as metal powders, colored pigments, and colored dyes are added to the heat-sensitive recording layer in order to obtain records by irradiating light carrying recorded information and thermally converting the light. However, the addition of these light-absorbing substances inevitably colors the white or near-white heat-sensitive recording layer, which means that the image formed on the heat-sensitive recording layer and the heat-sensitive recording layer itself It has five drawbacks: the contrast difference is small and the image formed on the heat-sensitive recording layer is difficult to read.

Therefore, in the present invention, as a result of repeated studies to obtain a heat-sensitive recording material in which image formation by light is possible and the contrast between the image formed on the heat-sensitive recording layer and the heat-sensitive recording layer itself is large, the heat-sensitive material is made of a heat-sensitive material. It has now become clear that the objects of the invention can be achieved by applying a thin metal vapor deposition onto the recording layer.

That is, the present invention is a heat-sensitive recording material characterized in that a heat-sensitive recording layer made of a heat-sensitive material is provided on a support, and a metal vapor deposition of 100A or less is further applied to the upper surface of the heat-sensitive recording layer.

In the present invention, the metals deposited on the heat-sensitive recording layer are white or lightly colored metals that act as light absorbers, such as aluminum, bismuth, nickel, antimony, zinc, copper, tin, magnesium, indium, and selenium. , cadmium, chromium, etc., and when these metals are deposited in large amounts, energy loss in the metal deposited layer is large, and sufficient thermal energy is not transmitted to the heat-sensitive recording layer, resulting in unclear recording. Even if the recording layer is colored, the image is hidden by the metal vapor deposited layer, making it difficult to read the image.

For this reason, it is preferable to deposit as little metal as possible, and the amount of deposition should be at most 100A1, at least to the extent that it is impossible to tell with the naked eye whether or not the metal is being deposited by an X-ray microanalyzer. Although it is possible to form an image by light even with a visible amount of vapor deposition, when considering the contrast between the density on the surface of the heat-sensitive recording material and the image density, a vapor deposition amount of about 30 A is preferable. Further, as the heat-sensitive material used for the heat-sensitive recording layer in the present invention, all those used for the heat-sensitive recording layer of conventional heat-sensitive recording bodies can be used. moreover,
The support referred to in the present invention includes any material that can function as a support, such as paper and polymer film.

The present invention will be described in more detail with reference to Examples below, and the amount of metal deposited is measured by the following method.

It is impossible to deposit a small amount of metal onto a heat-sensitive recording medium and measure the amount of metal deposition because the surface of the heat-sensitive recording medium is so uneven.

Therefore, in this example, the amount of metal vapor deposition was measured as follows. First, various metals were vapor-deposited on a glass plate, and the amount of the vapor deposited was repeatedly measured using a reflection interferometer M-type (manufactured by Olympus Optical Co., Ltd., which can measure the amount of vapor deposited up to a minimum of 10 A).

Next, based on this measurement result, metal vapor deposition was performed on the heat-sensitive recording layer under the same conditions as when metal was vapor-deposited on the glass plate, and from the results when metal was vapor-deposited on the glass plate, the metal of the heat-sensitive recording material was determined. This is an estimate of the amount of vapor deposition. Example 1 Solution I and Solution II were each milled in a ball mill for 5 hours,
A heat-sensitive recording paint was prepared by mixing 1 part of Liquid I with 3 parts of Liquid II.

After drying, apply this paint to 58y1d high-quality paper.
A heat-sensitive recording layer was prepared by coating the film to a thickness of 1d. next,
Aluminum 30 was vapor-deposited on the upper surface of this heat-sensitive recording layer to obtain a heat-sensitive recording material of the present invention. The aluminum vapor deposition concentration of this heat-sensitive recording material was 0.15 as measured with a Masbeth densitometer.
Next, the aluminum vapor-deposited surface of this heat-sensitive recording material was exposed to an argon laser (wavelength: 5145 A, output: 200 TrLW).
When the image was scanned at a scanning speed of 8TL/sec, a blue image could be obtained (the image density was 1.0 as measured with a Macbeth densitometer and a red filter).

In Example 1, 4f was prepared, and 2 parts by weight of Solution I were mixed with 2 parts by weight of Solution I to prepare a paint for a heat-sensitive recording layer.

After drying, apply this paint to 60 y' of high-quality paper, and the amount applied is 7 q.
It was coated to give I7T1 to form a heat-sensitive recording layer. Next, 100A zinc vapor deposition was performed on the upper surface of this heat-sensitive recording layer to obtain a heat-sensitive recording material of the present invention. The zinc-deposited layer concentration of this heat-sensitive recording material was 0.2 as measured with a Macbeth densitometer. Next, a pattern made by hollowing out an aluminum plate was layered on the zinc-deposited surface of this heat-sensitive recording material, and exposed to light using a xenon flash (Ideal Xenofax FX-150). The light that made the pattern transparent made it possible to obtain a black image (image density was measured with a Macbeth densitometer and was 0.9). Example 3 Solution I and Solution II were milled for 5 hours in each ball mill, and 10% of Solution I was milled.
20 parts by weight of liquid (2) was mixed with each part by weight to prepare a paint for a heat-sensitive recording layer.

This paint was applied to a 72JId tracing paper so that the coated amount after drying was 8JId to form a heat-sensitive recording layer.
Next, chromium 50 was deposited on the upper surface of this heat-sensitive recording layer to obtain a heat-sensitive recording body of the present invention. The concentration of the chromium deposited layer of this heat-sensitive recording material was 0.18 as measured with a Macbeth densitometer. Next, the chromium-deposited surface of this heat-sensitive recording material was exposed to argon laser (wavelength 5145A, output 2007T1.W).
When the image was scanned at a main scanning speed of 8 ml/sec, a black image was obtained (the image density was 0.68 as measured with a Macbeth densitometer).

Example 4 Commercially available thermal recording paper (TP-50KH-0 manufactured by Kanojo Paper Co., Ltd.)
The thermosensitive record of the present invention is coated with aluminum evaporation (vapor deposition to such an extent that aluminum evaporation can be detected by an X-ray microanalyzer, although it cannot be measured by a repeated reflection interferometer manufactured by Olympus Optical Co., Ltd.). I got a body.

The concentration of the aluminum vapor deposited layer of this heat-sensitive recording material was measured with a Masbeth densitometer and was 0.18. Next, a pattern made by hollowing out an aluminum plate was layered on the aluminum evaporated surface of this heat-sensitive recording material and exposed to light using a Canon flash (Ideal Xenofax FX-150).The light that passed through the roller pattern produced a black image ( The image density was measured with a Masbeth densitometer and was 0.6).

As is clear from the above description, the heat-sensitive recording material of the present invention has a gate structure in which a small amount of metal is deposited on the heat-sensitive recording layer, so that the image formed on the heat-sensitive recording layer and the heat-sensitive recording layer are Some have succeeded in creating thermosensitive recording materials that have a large contrast difference and are capable of forming images with light.

Claims (1)

[Claims] 1 A heat-sensitive recording layer containing an electron-accepting component and an electron-donating component is provided as a heat-sensitive material on a support, and 1
A heat-sensitive recording material characterized by being subjected to metal vapor deposition with a thickness of 00 Å or less.