JPS58197089A - Thermal recording sheet - Google Patents

Abstract

PURPOSE:To obtain the titled sheet having an excellent heat-melting resistance capable of withstanding high-speed recording and an improved density of color of a record, by providing on a supprting substance a coating layer containing saturated polyester as a binder, and a synthetic aluminosilicate of soda as a pigment. CONSTITUTION:An aimed sheet is obtained by coating a supporting substance with a coating in a quantity of 4-15g/m<2> which contains a binder formed solely of saturated polyester (e.g. polyethylene terephthalate, etc.) or of the mixture of the saturated polyester and polybinyl pirrolidone, and a pigment of 50- 900pts.wt. (in relation 100pts.wt. of the binder) containing synthetic aluminosilicate of soda. Thermal transfer is performed by making the coated surface of said sheet contact with a color material layer provided on a base material and containing subliming dye, and by pressing a thermal plate thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal recording medium, and more specifically, a substrate having a coloring material layer containing a sublimable dye is used, and the coloring material layer and a recording sheet are brought into contact with each other. This article relates to recording sorting in a thermal recording method in which sublimable dye is transferred by 71D heat from a head or the like.

In general, the most popular thermal recording method is to bring a thermal head into contact with rough road recording paper, which has a recording layer that develops color by causing physical or chemical X conversion when heated, to obtain the desired color recording. . However, this recording method is used. Thermal recording paper is susceptible to color contamination due to pressure, heat, and dirt from the landowner during storage and removal, and it is technically difficult to obtain high-resolution multicolor recording. It is said that

Therefore, as an alternative to the thermal recording method described above, the example λ is distributed according to Japanese Patent Application Laid-Open No. 51-15-446. The coloring agent, which is solid at room temperature or solid at room temperature, is spread on a base material such as paper or side fat film, and is brought into contact with the coloring material on the base material. , a method has been proposed in which recording is performed by heating the coloring material on the substrate using a thermal head and selectively transferring it to the recording sort. This recording method <
Add 1,000 binders to the color material layer during H1 heat recording! 8. A wet method in which the adhesive is transferred to the dye by melting and softening the mixture.
There is a dry method in which the dye in the color material layer is sublimated using a sublimation dye and adsorbed onto the recording notebook. In either case, normal use is basically possible.

However, the sharpness and color density of images recorded using the dry method depend on the adsorption or dyeing state of the sublimable dye on the recording sheet, which is completely different from the wet method in which the color material layer itself is transferred. ing.

The color material layer used in this dry method usually has a sublimation temperature of 60°C.
~300'C sublimable dyes, i.e. Nido-O series, Azo series,
It is formed by kneading disperse dyes such as quinoline type and anthraquinone type with a binder, and under normal conditions, no transfer of the dye is observed even when it comes into contact with the recording sheet.
The transition occurs only when the dye is sublimated by heating at 00'C.

The applicant of the present application has previously proposed in Japanese Patent Application No. 182894/1989 a saturated polyester binder or a mixed binder of saturated polyester and polyvinylpyrrolidone as a recording sheet with high color density for a dry thermal recording method such as on paper. We proposed that a coating layer containing a saturated polyester binder is most suitable, and that a saturated polyester binder is particularly effective in improving the light fastness of recorded materials.
; Since it is effective in increasing the color density of the proboscis, it was shown that if polyvinylpyrrolidone is used in combination with saturated polyester, the color density can be maintained well not only after recording 1 but also after high-dose ultraviolet light irradiation 1-. Ta.

Even with thermal recording methods, high-speed recording is required in order to compete with inkjet recording methods, etc., and for this reason, it is necessary to develop high-speed recording devices using thermal heads that require extremely high thermal energy. In parallel, there is a demand for the development of a thermal recording sheet that is compatible with this high-speed recording. In this regard, the thermal recording sheet size according to the above-mentioned Japanese Patent Application No. 55-182894 is 1 color, 1 color! Although it has excellent adaptability with respect to Ik degree, it has the disadvantage that thermal adhesion tends to occur between the sheet and the base material coated with the coloring material during high-speed recording.

As a result of conducting research to improve the above-mentioned drawbacks, the present inventors found that by adding synthetic alumino silicon powder to the coating layer of thermal recording sorting, a good product that can withstand high-speed recording; It has been found that the color Jif obtained and recorded as well is the same as above.

In other words, the present invention! /'i Providing a coating layer consisting of a saturated polyester or a mixed binder of saturated polyester, poly and nilpyrrolidone, and a pigment containing a synthetic alkanosilicic acid nodase? It is characterized by thermal recording even during high-speed recording;
・Does not adhere to the substrate, and also improves the color density of the recorded matter.

The non-invention method will be explained in detail below. The paint used for the uninvented thermal recording sheet is a pigment containing synthetic sodium aluminosilicate and a saturated polyester alone.

Or it warps from the binder which is a mixture of saturated polyester and polyvinyl vicritone, and the mixing ratio of the pigment is 50 to 900':! to 100 parts by weight of the binder. It is appropriate to use ' as the division.

Sodium aluminosilicate, which is used as a pigment in an uninvented manner, is also called a synthetic silicate, and its main composition is 5if.
t about 67-73%, At, (J3 about 8-11%, Na
It is a white synthetic pigment containing approximately 5 to 6 t (J), and is industrially produced by treating soluble sodium aluminosilicate with acids or alkalis under conditions that prevent gelation and obtain fine amorphous particles. Manufactured by precipitation with earth metal salts.

In the present invention, this synthetic sodium aluminosilicate is used as a coating pigment, but depending on the purpose, heavy or light carbonic acid, kaolin, Noriyoku, talc, titanium dioxide, aluminum hydroxide, magfusium, barium sulfate, It is also possible to use any pigment such as zinc oxide.

A representative example of the saturated boss ester used as a binder in the present invention is polyethylene terephthalate obtained by polycondensation of terephthalic acid and ethylene glycol (
PET, @ point 260'C), polybutylene terephthalate CPBT, M point 224°C), poly(1,4-chlorohexane dimethylene terephthalate) (
POHT.

(melting point: 290°C), polyethylene inophthalate (melting point: 107°C), etc. These phthalic acid polyesters usually do not dissolve easily in most solvents 1C, but recently they have been made into granules in A.
Those soluble in common solvents and water-dispersed ones are commercially available as saturated polyester binders. Although it is possible to use the binder for H coating and the saturated polyester such as 1-Tekorin in the form of a solvent solution, it is preferable to use a water dispersion type because it is easy to handle.

10,000, polyvinylpyrrolidone is a highly water-soluble polymer that forms a transparent film.

It is known for its applications in pharmaceuticals, cosmetics, adhesives, and textile finishing agents.

In addition, when saturated polyester and polyvinylpyrrolidone are used together, polyvinylpyrrolidone is used in an amount of 1 to 1 part by weight of 100 parts of saturated polyester. - When blending 31 parts,
The uninvented thermal recording sheet, which provides a thermal recording notebook with the best color density and fastness, is made by applying the above-mentioned paint to 9 sheets of high-quality paper, coated paper, paperboard, woven fabric, non-woven fabric, etc. Arbitrary support such as a-m finger film: on the holding body, blade, f, ()
, a roll coater or the like, or a size press or the like.

It is desirable that the coating amount is about 4 to 15 g/m2.

In addition, the effect of preventing heat fusion and improving the color'gk degree by adding the synthetic Flumino powder (d, oxidized resin, SBR latex, and polyvinyl alcohol 1 pond Q binder was also slightly observed in the case of The binder of Rotsu I and Kui et al. cannot obtain a thermal recording sheet of satisfactory quality because the binder itself has insufficient ability to adsorb dyes and develop color. By combining the properties of the synthetic aluminosilicate node with a saturated polyester or a mixture of a saturated polyester and polyvinyl vicritone, it is possible to provide a thermal recording sheet suitable for high-speed recording. It is something.

Hereinafter, the present invention will be explained as an example;
[Example 1. : Saturated Bossester's 40 winter moisture Atsasa (Toyo Young Wife Pineal: %4D-1200) 2 oiz part (solid)'C
, The present invention jointly attacks alumino silicate node (J, M,
Hyper-based Zeolex 17δ), as well as comparative examples and 1
- 2 types of heavy carbonate/rum (Shiraishi Kogyo HPO1 Maruo Riki Runwamu Fuakadama), 21 types of heavy carbonate/rum (Maruo Cal/Umu Fc-40, A-Yo and Super 1500)
'), white carbon (Mizusawa Kagaku Yunluton A), Merck, titanium dioxide, barium sulfate, and zirconium silicate (Micropax 2O-A, manufactured by Hakusui Kagaku). 80 parts by weight (solid content) of each pigment slurry were mixed. I tried a total of 10 types of paint. These paints were applied to a high-quality paper with a Steckigt size degree of 12 seconds, US p 661/m', and a thickness of 97 μm, so that the coating amount was 6 to 10 gy. I got one.

10,000, Dispane Blue 24 as a sublimable disperse dye
x Product name Duranol Blue 2 G), Disperse Yellow 42 (Product name Re5olin Yellow
OWGRL) and Disperslet'-1 (product name: Ce1liton 5carlet B) were used four times, and 1 part of dye with nf 10 weight, 1 part of vinyl butyral 3i, and inopropyl alcohol 45Xi were added.
The mixtures were combined in a three-roll mill at a ratio of n to prepare evening, yellow, and red sublimation thermal transfer inks. Furthermore, using a transfer base paper made by gravure printing these I/Rs on US 7F309/m" tissue paper, the printed surface of this base paper and the coated surface of the above thermal recording/t. 3α
Press the thermal plate of 1 for α2 seconds and record the heat/-
Heat transfer printing.

The heat fusion resistance was evaluated by observing the state of fusion between the thermal transfer base paper and the thermal recording/human after 1% transfer, and evaluating it in the following 4 grades of A- and D, with A being good. did.

A: The base paper for the second transfer is completely fused to the thermal recording sheet.
If you flick the thermal recording notebook from the back with your finger, the base paper will separate.

C: Press the thermal recording sheet on the back side with your fingers ((i) The base paper will not separate if you press it with your fingers, but it will come off relatively easily if you use tweezers.D = It will not separate even if you use a bottle set .

The reflection S degree of the recorded material was thermally transferred to the thermal recording notebook as described above! The opposite densities of the recording surfaces of , yellow, and red were measured using a Macbeth density/f meter. In addition, the reflection density is the value obtained by using the following films: blue (Visual Granoten 106), yellow (Lanoten 47), and green (Lanoten 433).Table L Test results of Example 1 From Table 1, it can be seen that the thermal recording sheet according to the present invention, which uses saturated polyester as a binder and synthetic alumino silicon resin as a pigment, does not cause any thermal adhesion with the base paper for thermal transfer, and the recorded material It is clear that the reflection density is also good.On the other hand, thermal recording/-) A2-10, which uses pigments other than synthetic sodium aluminosilicate, has poor heat fusion resistance and is difficult to record. It is recognized that the reflection density of No. 1 is also considerably inferior to that of No. 1.

Note that base paper yarn No. 119, which did not have a coated layer, had good resistance to I deliberation, but only an extremely low reflection density was obtained.

[Example 2] A mixed binder liquid consisting of a 40% aqueous dispersion of saturated polyester (Pyronal MD L200 manufactured by Toyobo) 14 parts by weight (solid content) and a 40% aqueous solution of polyvinylpyrrolidone 6 parts by weight (solid content) , Example 0 (A total of 10 types of paints were prepared by mixing 80 parts by weight (solid content) of the same pigment slurry as in Example 1. ~21 was obtained.

Table 2 shows the results of these thermal records and tests conducted in the same manner as in Example 1.

Table 2 Test Results of Example 2 From Table 2, it can be seen that the thermal recording sheet &12 according to the present invention has a thermal I% of 1% compared to the thermal recording sheets 1-3 to 21 of the comparative examples. !
: Excellent adhesion and color density of recorded matter were observed.

Comparing the thermal recording sheets of Example 1 and 12 with the thermal recording sheets of Example 1 and 1, it was found that the reflection density of the recorded material was different from that of saturated polyester and polyvinyl hydride alone. It is found that using a mixed binder of

Patent applicant Jujo Paper Co., Ltd. I++'--bone Representative patent attorney Waten Kawasumi −ichishi□−bone

Claims (2)

[Claims] (1) In the thermal recording sheet 'IC', a via layer is brought into contact with a color material layer containing a sublimable dye provided on a base material, and selectively receives the transfer of the sublimable dye group by heating. 1. A recording sheet comprising a coating layer containing saturated polyester as a coating layer and synthetic aluminosilicate as a pigment. (2) A thermal recording sheet that contacts a color material layer containing a sublimable dye provided on a base material and undergoes selective transfer of the sublimable dye by heating. A mixture of polyester and polyvinylpyrrolidone, containing synthetic aluminosilicate salt as a pigment, was used for coating;