JPS6248585A - Thermal recording paper - Google Patents

Abstract

PURPOSE:To prevent marring, contamination and fading or deterioration caused by UV rays or the like from occurring, by constituting a thermal recording paper of a base, a thermal recording layer and a transparent resin layer comprising a UV absorber. CONSTITUTION:A thermal recording paper 14 comprises a base 11, a thermal recording layer 12 provided on the base 11, and a transparent resin layer 13 comprising a UV absorber and provided on the layer 12. The recording layer 12 comprises a thermally reactive colorless dye 19 and a color developer 20 dispersed uniformly in a binder. The base 11 is a paper, a synthetic paper or a plastic film. The UV absorber may be based on benzotriazole, salicyclic acid, benzophenone, cyanoacrylate or the like. The transparent resin layer 13 protects the thermal recording paper 14 from contamination and marring, and prevents fading or deterioration from being caused by UV rays.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to thermal recording paper.

[Summary of the invention]

The present invention comprises a thermosensitive recording paper as a whole base material, a thermosensitive recording layer formed on this base material, and a transparent resin layer containing an ultraviolet absorber formed on this thermosensitive recording layer.
This prevents fading and deterioration caused by scratches, pollution, ultraviolet rays, etc.

[Conventional technology]

For example, a POS printer is used to print information such as a brand name, size, quality indication, product number in one color, and price on a product in the form of a bar code, which can then be read with a light pen or the like when necessary.

Conventionally, in order to print this entire barcode, for example, as shown in FIG. 5, a thermal recording paper (3) consisting of a base material (1) and a thermosensitive recording layer (2) formed on this base material (1) is used. f: Color development method by applying the thermal head (4) to the area to be printed and forming the thermal recording layer (2) on the area to be printed, as shown in Figure 6, an ink layer ( The ink layer (6) to be printed is applied to the thermal head (4) from above using the ink layer (7) on which the ink layer (6) has been formed.
) is used to melt the ink and transfer it to paper (8). (5) is a colored portion, and (9) is a printed portion.

[Problem that the invention seeks to solve]

According to the method of using thermal recording paper (3) shown in Fig. 5, (1) the surface of the thermal recording paper is rough and light is diffusely reflected;
Problems such as poor shelf life and poor O1D display quality were common, as the apparent density was low, reading stains were generated, and the color was easily read (11).The color fading was severe due to hand oil, light, etc. In order to solve these problems, a method using the entire ink ribbon (7) shown in FIG. 6 has been used, but this method also has the following problems. That is, (1) when reading a printed bar code in write-in mode, the wax-based ink rubbed off and smudged the non-printed area, resulting in reading errors.

(11) An expensive recording ink ribbon was required, and unnecessary ink ribbon was generated after use.

010 A uniform printing condition could not be obtained unless the paper used for printing had a very high degree of smoothness.

The present invention provides a thermal recording paper that can solve the above problems.

[Means for solving problems]

In the present invention, a heat-sensitive recording paper α, a material α, a heat-sensitive recording layer (6) formed on this base material α, and an ultraviolet absorber gold-containing layer formed on this heat-sensitive recording layer are used. Consists of a transparent resin layer.

The heat-sensitive recording layer (2) contains a heat-reactive colorless dye (
) and a color developer are uniformly dispersed.

Examples of heat-reactive colorless dyes include crystal violet lactone (CVL), benzoylleucomethylene blue, spiropyran derivatives, fluoran compounds, and lactam compounds (rhodamine lactam). Examples of the color developer include phenolic compounds such as bisphenol A, 4-tarjarifthylphenol, and 4-phenylphenol, phenolic polymers, acidic polymers, organic acids, and salts thereof.

As a binder, for example, polyvinyl alcohol (PV
A) Select from one or more of Calxymethylcellulose, hydroxyethylcellulose, methylcellulose, Arabica, casein, starch, polyacrylamide, polyacrylate, polyvinylpyrrolidone, and styrene-maleic anhydride copolymer. I can do it.

In this heat-sensitive recording layer (2), additive materials such as filler,
A lubricant, a mold release agent, a non-tacky waxy substance may also be added.

As the base material α, for example, paper, synthetic paper, or plastic film can be used.

As ultraviolet absorbers, benzotriazole absorbers,
Examples include salicylic acid-based absorbents, benzophenone-based absorbents, and leyanoacrylate-based absorbents.

In addition, the thickness of the transparent resin layer (total) is, for example, 0.1 to 10
μ position is preferable.

[For production]

According to the present invention, the transparent resin layer 03 containing an ultraviolet absorber formed on the heat-sensitive recording layer (2) is formed on the heat-sensitive recording paper α4.
It can protect against T-contamination and abrasion, and at the same time prevent fading and deterioration caused by ultraviolet rays.

〔Example〕

Example 1 As shown in FIG. 1, on a base material (1) made of synthetic paper,
Cal as a binder? A paint made by adding and uniformly dispersing crystal violet lactone (CVL) as a heat-reactive colorless dye, bisphenol A as a color developer (1), and clay as a filler in oxymethylcellulose is applied. A thermosensitive recording layer (12) is formed.

Then, on this heat-sensitive recording layer (2), 99.7 parts of cal-xymethyl cellulose as a transparent resin and 2-(2- and doro*cy 5-methyl-phenyl)-2H-penztriazole as an ultraviolet absorber are deposited. (See structural formula below) 0
．． A transparent resin layer (2) consisting of three parts is formed to a thickness of t-0, 2μ to obtain a thermosensitive recording paper α4 according to this example.

Using this thermal recording paper α4 gold, as shown in Figure 3, when a bar code was completely printed using a linear thermal head (G), the print density measured by the Macbeth densitometer was 1.1 υ, and there was no diffused reflection of light. A clear print was obtained in which the printing was prevented. αQ is a coloring part. This barcode was read by rubbing it with a light pen more than 10 times, but no abnormalities were observed and no reading errors occurred even once. Furthermore, when this printed thermal recording paper α4 was left in a place exposed to direct sunlight near a window for two weeks, the density of the barcode was 0.8.
There was no abnormality in the reading. Further, even when the product was left indoors for more than 3 months, no change in concentration occurred.

Example 2 As shown in Fig. 2, an adhesive layer and a release paper Q frame were formed on the back side of thermal recording paper α→ produced in the same manner as in Example 1 to make a label specification, and a bar code was printed on the entire surface of the thermal recording paper α→. went. This thermosensitive recording paper α4 was pasted on a magnetic tape cassette and read 30 times using a cart machine equipped with a barcode reader, but no abnormality was found.

FIG. 4 shows a thermal recording paper α4 in which the entire surface is colored and printed, or a thermal recording paper α4 in which a thermal recording layer (6) of a different color is formed on all predetermined portions.

Comparative Example 1 As shown in FIG. 5, on a base material (1) made of synthetic paper,
Cal? Thermal recording paper N1(2)'fr was formed by applying a paint made by adding and uniformly dispersing crystal violet lactone (CVL), bisphenol A, and clay in oxymethylcellulose, and producing thermal recording paper (3) according to this comparative example. ).

'This thermal recording paper (3) was heated and printed according to the barcode information using a linear thermal head (2) as shown in FIG. The density of the printed barcode was 0.5. When this printed thermal recording paper (3) was left in a place exposed to direct sunlight near a window, the density decreased to 1/3 in 2 to 3 days and it became impossible to read it with a light pen. Ta. Also, even if left indoors, 1/2 of the amount will be reduced after 2 weeks.
At the following densities, it became impossible to read with a light pen.

In the same manner as in Example 2, this heat-sensitive recording paper (3) was made into a label, and when it was pasted onto a magnetic tape cassette and read by a cart machine, it could not be read 30 times and 0 times.

Comparative Example 2 As shown in Fig. 6, an ink ribbon (7) consisting of a wax-based ink layer (6) formed on a base material (1) of synthetic paper 9 was used, and a barcode was printed on it. I went to print.

A clear barcode was obtained with a printing density of Vi 1.3, but when I rubbed the printed surface with a light pen to read the entire barcode, the printed surface rubbed once or twice, resulting in reading errors.

In addition, in the same manner as in Example 2, when this printed paper (8) was pasted on a magnetic tape cassette and read with a cart machine, there was no abnormality for the first 10 times, but after that, The ink on the barcode rubbed off, causing many reading errors.

〔Effect of the invention〕

According to the present invention, the transparent resin layer formed on the heat-sensitive recording layer can be prevented from being contaminated and discolored by oils and fats from hands, and from being scratched by light pens and the like.

Furthermore, the surface of this transparent resin layer is smooth and diffused reflection is prevented, so the apparent density is significantly improved and clear printing can be obtained. Further, since the ultraviolet absorber contained in the transparent resin layer absorbs ultraviolet rays in external light, fading and deterioration of the print due to ultraviolet rays can be completely prevented. Therefore, the present invention is particularly suitable as a thermal recording paper for barcode recording.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing embodiments of the present invention, and FIG.
The figure is a perspective view showing a printing method, FIG. 4 is a plan view showing another embodiment, and FIGS. 5 and 6 are sectional views showing conventional examples. α■ is the base material, θ is the thermosensitive recording layer, α1 is the transparent resin layer, (
14 is covered with thermal recording paper. -1 Agent 9 Fuji Sada゛'''', Pa; Same Hidemori Matsukuma 1 Harm: (-Q:
(Includes) Shirikomayoki @ Erenura cross section Figure 1 Coffin Mokusho Fengshi - Cross section Figure 2

Claims (1)

[Scope of Claims] A heat-sensitive recording paper comprising: a base material, a heat-sensitive recording layer formed on the base material, and a transparent resin layer containing an ultraviolet absorber formed on the heat-sensitive recording layer.